GB/T 3783-1994 Basic requirements for marine low voltage electrical appliances
Some standard content:
National Standard of the People's Republic of China
Basic requirements for low-voltage apparatus in ships
General specification for low-voltage apparatus in ships
1 Subject content and scope of application
GB/T3783--94
Replacement of GB3783-83
This standard specifies the basic requirements for low-voltage apparatus in ships, including terminology, durability, working and installation conditions, structural and performance requirements, and verification of characteristics and performance.
This standard applies to control and distribution appliances for mobile and fixed offshore installations on ships with a voltage of 1000V AC or 1200V DC and below (hereinafter referred to as marine appliances). See Chapter 4 for applicable product categories. 2 Reference standards GB2423.1B9 Basic environmental test regulations for electronic products Test A: Low temperature test method Basic environmental test regulations for electrical and electronic products Test B: High temperature test method GH2423.2-89 GB2423.4-90 Basic environmental test regulations for electrical and electronic products Test 1b; Cyclic damp heat test method GB2423.16-90 Basic environmental test regulations for electronic products Test J: Long-term test method GB 2423. 17-81 Basic environmental test regulations for electronic products GB 2423.18-81 Test Ka: Salt spray test method Basic environmental test regulations for electrical and electronic products Test Kb: Cyclic damp heat test method (oxygen solution) Batch inspection counting sample procedure and sample table (applicable to inspection of consecutive batches) GB 2828—87
GB2829-87
Periodic inspection counting sample procedures and sample techniques (applicable to qualitative inspection of production process) GB/T2900.1~-92 Basic technical evaluation of electrical L
GB/T 2900.18.--92
Electrical technical low voltage electrical appliances
GB 3836. 1—831
GB 3836.2---831
General requirements for explosion-proof electrical equipment for explosive atmospheres Explosion-proof electrical equipment for explosive atmospheres End-explosion-proof electrical equipment" GB3836.3-83\
Explosion-proof electrical equipment for explosive atmospheres Increased safety electrical equipment" GB3836.4-83
Explosion-proof electrical equipment for explosive atmospheres Intrinsically safe circuits for explosive atmospheres Electrical equipment" Explosion-proof electrical equipment for explosive atmospheres Normal electrical equipment" GB 3836.5--87
Spark-proof electrical equipment for explosive atmospheres Non-sparking electrical equipment\" GB 3836.8—87
GB4025—83 Colors of indicator lights and buttons
GB4026—83 General rules for identification of electrical wiring terminals and marking of wiring terminals with non-numeric symbols GB4205—84 Standards for the identification of control components of electrical equipment B4207-84 Method for determining the relative tracking index and residual current tracking index of solid insulating materials under humid conditions GB4942.2—93 External parts of low-voltage electrical appliances Shell protection grade GB4988-85 Rated frequency, rated voltage and rated current of electrical products for use on offshore and upstream oil platforms GB7094-86 Vibration (vibration) test methods for marine electrical equipment GB/T13384-92 Technical conditions for self-contained electrical equipment for electromechanical products GB13539.1-92 Basic requirements for low-voltage circuit breakers State Administration of Technical Supervision 1994-05-19 Approved 1995-01-01 Intended use
W.GA/T 3783 --94
GB/T14048.1-93 General rules for low rejection switchgear and controlgear JB2759—80 General technical conditions for packaging of electromechanical products JB3284—83 Basic environmental conditions and test methods for transportation and storage of motors and electrical products B4386.2—88 General provisions for environmental testing of electronic products for mobile platforms and tidal facilities ZJBK04005—87 Tilting and swinging test methods for marine electrical equipment (1) GB3B36.1, GB 3836.2 and (B 9836.3 are all below. On June 27, 1988, the State Administration of Standardization issued the first revision list, which was published in the 10th issue of the China Standardization Magazine in 1988, b. 3 Terms, symbols and numerals
3.1 Terms
Terms specified in this standard are common terms in marine electrical appliances. The meanings of general terms used in this standard can be found in GB/T 2900.1. CB/T 2900.38.
3.1.1 Setting value
Parameters that are artificially adjusted in advance to cause the electrical appliance to operate (or not operate). 3.1.2 Responding value The value that actually causes the electrical appliance to operate.
3.1.3 Over-current
Any current that exceeds the rated current.
3.1.4 Overload
Operating condition that produces over-current in a normal circuit. 3.1.5 Overload current Over-current in a circuit that has not been electrically affected. 3.1.6 Making contact: a control contact or auxiliary contact that closes when the main contacts of a mechanical switch are closed and opens when they are disconnected. 3.1.7 Breaking contact: a control contact or auxiliary contact that closes when the main contacts of a mechanical switch are closed and opens when they are disconnected. 3.1.8 Cut-off current: the instantaneous current value that a switch or fuse reaches during the breaking action. Note: The circuit current has not yet reached the expected peak current. This is the value that the switch or fuse disconnects. 3-1.9 Overcurrent protection coordination of overcurrent protection devices: two or more overcurrent protection devices are connected in series to ensure reverse current selective protection and (or) backup protection. 3.1.10 Short-time withstand current shott-tinewithstand current The current that a switching device can carry in a specified short time under the specified conditions of use and performance, when the device is in the closed position or is not in the closed position. 3.1.11 (circuit or switching device) limiting current cnnrlitirmalshort-circuit current (of acircuit switching device)
Under specified conditions of use and performance, the circuit or switching device protected by the specified current limiting device (short-circuit protection device) can withstand the expected current within the action time of the limiting device (short-circuit protection device). 3.1.12 impulse withstand voltage (impact withstand voltage) inpulse: wi1lsladvoltage, the highest peak value of the impulse voltage with a certain waveform and probability that does not cause a breakdown under specified test conditions. 3.1.13 (environmental conditions) pollution degree (rlcnvirontnentaleunditiuns) The classification of environmental conditions based on the amount of conductive or absorbed dust, free gas or salt and relative humidity, as well as the amount of the occurrence of the event of the dielectric strength and (or) resistivity of the device surface decreasing due to moisture absorption or condensation. 632
W.GB/T 3783--94
Note, ① The pollution level of the exposed electrical appliances or equipment is different from the pollution level of the external or internal thermal method, to prevent moisture absorption or the pollution level of the electrical appliances or equipment in the observation environment.
② The pollution level of this standard refers to the pollution level of the micro environment. 3.1.14 Overvoltage category (installation category) w:rvoltag:ategiry is based on the limited (or controlled) voltage (or H in the electrical system with different nominal voltage) The expected overvoltage of an electric system is determined based on the method used to limit the overvoltage. Note: In an electrical system, the method of converting a transient overvoltage from an overvoltage category to a lower overvoltage category is referred to as: an overvoltage protector or a parallel impedance combination that consumes or converts energy during the transient overvoltage protection period.
3.1.15 Normal working voltage:3.1.16 Reliable operation: The electrical appliance can operate without failure under the specified working conditions. 3.1.17 Moisture resistant insulation: The insulation performance of the standard sample of the material is not less than the specified requirements after the heat test specified in GB2423.4. 3.1.18 Alcohol resistant insulation: The insulation performance of the standard sample of the material is not less than the specified requirements after the heat test specified in GB2423.16. 3.1.19 Flame resistant insulation: The insulation performance of the standard sample of the material is not less than the specified requirements after the heat test specified in GB2423.16. The standard sample of material has been subjected to the flame retardancy test specified in 8.18, and the length of continuous burning without transmitting energy is not greater than the rated value. 3.2 Symbols
U: Rated operating voltage
U.. Rated insulation voltage
Uimp: Rated impulse withstand voltage
I. Conventional heating voltage
Ime: Conventional enclosed heating voltage
I.: Rated current of release
: Long-time delay release setting current
. Short-time delay release setting current
1, Instantaneous release setting current
: Priority pre-alarm release setting current
1,: Rated operating current
I.: Rated uninterrupted current
: Instantaneous value of current
T.: On-off operation cycle
Power-on time
I. Rated short-time withstand current
Iem: Rated short-circuit connection capacity
I.: Rated short-circuit breaking capacity
cog: Power factor
T, time constant
TProduct DC current rises from zero to 55% stable positionU Rated control circuit voltage
W.bzsosocomU.: Rated control power supply voltageK
SCPI: Short-circuit protection device
CTI: Comparative tracking index
PE: Grounding
PEN: Grounded neutral
1.: Breaking current
IP: External protection level
AC. Alternating current
DC: Direct current
3.3 Code
G3/1 3783 -94
The types of use and their generation characteristics commonly used in marine electrical appliances! Bag
Current type and type of use
At:-61h
Unfiltered or low inductive load resistor
Type of current
Linear induction motor overrun, breaking
Limited cage induction motor, non-price-breaking cage induction motor, original forbidden state change of operation, micro-light on and off
Incandescent lamp on and off
Transformer on and off
Capacitor bank on and off
With card false load release seal cold Compression ratio motor energy control H dynamic complex value overload detection list etc. The control is also the control of the internal motor control barrier load rate control transformer insulation around the negative cutting
control to reduce the positive micro-drinking negative I
connection AC piece negative stack
installed products
marine low voltage
contactor and
motor starter
marine electromechanical
control circuit electric
W. Current type use category generation special
AC and DC
4 classification
LIC-20
GB/T 3783 94
Continued 1
Type is used to close and open the circuit under no-load conditions
On and off resistive loads. Including switching on and off moderate overloads, resistive inductive loads, including switching on and off moderate overloads, motor loads or other inductive loads without rated current requirements, circuit protection with rated short-time current requirements, non-inductive or low-inductive loads, starting and reverse braking of excited motors, short-term operation, inching, and motor separation in dynamic conditions. Starting, reverse braking or reverse operation, jogging, and automatic disconnection of motors during operation. Controlling resistive loads and light-insulated solid-state loads. Controlling DC electromagnetic technology. There are economical current electromagnet loads in the control circuit. Closing and disconnecting the circuit under no-load conditions. Switching on and off resistive loads, including switching on and off moderate 2\.1-stage switching on and off mixed inductive loads, including switching on and off moderate overloads (such as shunt-excited motors) and switching on and off high inductive loads (such as motors). Classification by the type of marine electrical products
4. 1.1 Marine low-voltage power distribution switchgear
4-1.1.1 Marine low-voltage circuit breaker
Marine low-voltage air isolator
4. 1. 7-2
4. 1- 1. 3
Marine low-voltage air switch
4. 1.1.4 Marine low-voltage air isolator
4.1.1.5 Marine low-voltage fuse
Marine spiral fuse
Marine knife fuse.
4.1.1.6 Marine low-voltage fuse combination electrical appliances Marine fuse switch!
Marine fuse circuit breaker.
4-1.1.7
Marine power transfer switch
4.1.2 Marine low-voltage control electrical appliances
4.1.2.1
Marine low-voltage contactors
Marine air contactors;
Marine semiconductor contactors
Marine air contactors,
4.1.2.2 Marine low-voltage motor starters (including thermal overload relays, etc.) related products
Equipped with low-voltage
Tower breakers
Including electrical appliances
Marine low-voltage circuit breakers
Marine low-voltage service
Waist contactors
Marine electromechanical
Control output
Luo electric appliance
Marine low voltage
Hua Xi device
Answer electric appliance
Wb
Marine AC direct (full voltage) starter
Marine AC star-delta pressure reducing starter:
Marine rotor rheostatic starter,
Marine AC self-fusible pressure reducing starter:
Marine semiconductor starter;
Marine vacuum starter:
Marine frequency-sensitive starter.
GB/T 3783—94
4.1.3 Marine control circuit electrical appliances (control switches and circuit components) 4.1.3.1 Marine manually operated control switches a.
Marine register button:
Marine rotary switch +
Marine foot pedal and off.
4.1.3.2 Marine control relays
Marine time delay contactor relay,
Marine time contactor relay
Disconnection electric relay;
Marine semiconductor relay.
4. 1.3.3 Marine indicator switch
Marine pressure switch:
Marine thermal switch (temperature relay): Marine program switch,
d, Marine liquid level switch.
4.1.3.4 Marine position chain switch (such as marine limit switch) 4. 1. 3. 5
Marine proximity switch
Inductive type;
Capacitive type:
Ultrasonic type!
Northern electric coupling type.
4.1.3.6 Marine control circuit components (such as marine indicator lights, etc.) 4.1.3.7 Marine other control circuit devices (such as marine protection relays, etc.) 4.1.4 Marine multifunctional and combined electrical appliances 4.1.4.1 Marine automatic transfer switch electrical appliances
4.1.4.2 Lead-free self-matching output devices
4.1.4.3 Marine other multifunctional combined electrical appliances 4.1.5 Marine power transmission electrical appliances and other low-voltage devices 4.1.5.1 Marine resistors and varistors
4.1.5.2
4.1.5.5
4.7-5.6
4-1.5.7
4.1.5. 8
Marine cheek-sensitive resistor
Marine excitation resistor
Marine voltage regulator
Marine frequency regulator
Marine traction electromagnet
Marine brake electromagnetic lock
Marine lifting electromagnet
W.4.1.5.9 Marine electric filter pressure actuator
4.1.5.10 Marine other auxiliary electrical appliances
4.2 According to the operation mode
Manpower operation:
Manpower operation:
Electromagnet operation,
Motor operation:
Motor energy storage operation:
Compressed air operation:
Electric-compressed air operation.
4.3 According to the arc medium
Air:
Vacuum,
Other gases.
4.4 According to the shell protection level
GB/T 3783—94
The protection levels of commonly used shells for marine electrical appliances are shown in Table 2: Table 2
Protection level symbols
4.5 Pollution level classification
4.5.1 Pollution level 1
Commercial description of the first digit
Protection against solids larger than 12mm
Protection against solids larger than 12mm
Protection against particles larger than 1mm
No pollution or only dry non-conductive pollution, 4.5.2 Pollution level 2
Comprehensive description of the second digit
No protection against water
1G\drop
Protection against violent waves
Protection against violent waves
Generally, there is only non-conductive pollution, but the occasional short-term conductivity caused by condensation must be taken into account. 4.5.3 Pollution degree 3
Conductive pollution, or non-conductive pollution caused by the expected condensation becomes conductive. 4.5.4 Pollution degree 4
Causes persistent conductive pollution, such as pollution caused by needle dust or use of the frame 4.6 Connection installation category (overvoltage category) classification (see figure) 637
WT
GB/r 3783-94
Installation specification diagram
I3W-Marine frame circuit breaker Iz, Marine plastic bypass circuit breaker, RT. Marine knife type circuit breaker; QC--Marine starter; HH, sealed load and switch; HI). Marine knife and beauty; I7,. Ship combination switch; 1, X: a ship travel switch: 1, W, -- ship energy conversion switch
4.61 Installation category (overvoltage category) (screen water level) Special equipment or components installed at the end of the system line. For example, electrical appliances using low-voltage electronic logic systems and remote control of low-power signal circuits,
4.6-2 Installation category (overvoltage category) (load water level) Electrical equipment or components installed before and after installation category 1, such as electrical appliances that control and pass motors, solenoid valves, energy-consuming electrical appliances (electric lights, electric heaters), and electrical appliances that connect the reverse command of the instrument and control the middle circuit. 4.6.3 Installation category (overvoltage category) (power distribution level) Electrical equipment or components installed before installation category I and after installation category N. For example, electrical equipment directly connected to the power distribution line installed in the ship's distribution box.
4.6.4 Installation category (overvoltage category) N (power supply level - level) Electrical equipment installed before installation category (overvoltage category) I. For example, electrical equipment installed at the power supply line, 4.7.10 Class marine electrical equipment
In this type of equipment, the protection against electric shock is mainly guaranteed by basic insulation, that is, when the equipment has fixed leads, no conductive connecting parts are provided between the accessible conductor parts and the protective earthing conductor, and the surrounding environment is relied on in the event of damage to the basic insulation. 4.7.2 Class marine electrical equipment
WG/T 3783 94
In this type of equipment, the protection against electric shock is not achieved by basic insulation, but also includes the safety measures of connecting the accessible parts to the protective earthing conductor. In the case of damage to the insulation, the accessible conductor parts will not have a voltage that is dangerous to people.
4.7.3 Class I electrical equipment
In this type of equipment, the protection against electric shock does not rely on basic insulation, but H also adds additional insulation to form double insulation or adopts safety measures such as strong insulation, and does not specify or determine the installation conditions for protective earthing. 5 Characteristics (basic parameters)
Characteristics not specified in this standard shall comply with (iH/114048. ! The current provisions. The operation of the relevant fuses shall comply with the relevant provisions of (GB13539.1. 5.1 Overview
The characteristics of marine electrical appliances shall be specified in the relevant product standards, and the following applicable characteristics and their values may be used to represent them. a.
Types and models of marine electrical appliances (3.2); Rated value and pole value of main switch (5.3
Category of use (5.4);
d Control circuit (5.5);
Auxiliary circuit (5.6);
Marine relays and releases (5.7);
Coordination of electrical appliances and short-circuit protection devices (PTs) (5.8); Overvoltage during on-off operation of marine electrical appliances (5.5). 5.2 Marine Types and types of electrical appliances
Product standards should specify the following applicable items: Type of electrical appliances, contact energy, circuit breakers: a.
b. Current type (AC including frequency);
Interrupting medium:
e. Operating conditions (operating method, heat treatment part) The above items are not limited and can be increased or decreased: 5.3 Rated values and limit values of main circuits
The rated values and limit values of the main circuits should be determined in the design and design. According to the requirements of relevant product standards, the required rated values and limit values should be specified in the drawings or technical documents.
5.31 Rated voltage
Electrical appliances should determine the following rated voltages. The rated working voltage and rated working current of marine electrical appliances are combined to determine the purpose of marine electrical appliances, various usage categories and corresponding tests are related to them. In order to be suitable for different working systems and usage categories, "individual electrical appliances can be specified by combining the rated working voltage and the rated working current (or power) or the rated working voltage with the connecting and breaking capacity combination. For single-pole marine electrical appliances, the voltage across the poles (contact disconnection position) is generally specified as the rated working voltage. For multi-pole marine electrical appliances, the phase-to-phase voltage is generally specified as the rated working voltage. Marine electrical appliances should generally adopt the voltage and rated frequency specified in Table 3. 639
W. Current type
G/T 3783---94
12.21.36.11n,22n,140,750
24.36.(11G),220,660
Note: The data in parentheses in the table are from the domestically manufactured product specification 5.3.1.2 Rated continuous voltage ()
Rated voltage, Hz
50 or (60)
The rated insulation voltage of marine electrical appliances shall be the same as the neutral voltage of the test object, creepage distance, etc. In any case, the maximum value of the rated working voltage shall not exceed the rated insulation voltage. Note: No recommended electrical appliances are The rated continuous test voltage is clearly specified, and the maximum working voltage is the new specified insulation voltage. 5.3.1.3 Rated impulse withstand voltage (0m) Marine electrical appliances can withstand the waveform and the peak value of the special impulse voltage without failure under the specified test conditions. The rated impulse withstand voltage is related to the electrical clearance, etc. The rated impulse test voltage of marine electrical appliances should be greater than the specified value of the transient overvoltage that can be generated by the circuit in which the device is located. The specified impulse withstand voltage is preferably lower than 9.5.3.2 Current Marine electrical appliances must determine the following currents, and their rated current values are generally R 4888 5.3.2.1 Standard heating current (m)
Standard heating current is the maximum value of the test current used for temperature rise test of electrical appliances. The atmospheric conditions should be positive indoor air without ventilation and external radiation. The standard heating current is at least equal to the maximum value of the rated working current of the electrical appliances used in the system. Note: The standard heating current is not specified in the electrical appliance standard 1, 5.3-2.2 Standard closed heating current (?
Standard closed heating current is specified by the manufacturer and is used to install the specified external pipe Temperature rise test for marine hazardous devices in the marine environment. The agreed closed heating current should be at least equal to the new specified current value for eight hours of working time. If it is marked as a closed device in the product sample, usually called a closed device, it is usually used in one or more enclosures of the current type and size. It is mandatory to conduct a verification test. The verification agreed closed heating current should be tested in the specified design size range. If the product is not used in the specified enclosure, the agreed closed heating current has not been verified, then the agreed closed heating current is not mandatory to be tested, but the manufacturer should provide the closed heating current or reduce the coefficient of its use. 5. 3.2. 3 Rated operating current (1,) or rated value, 1. The rated operating current of marine electrical appliances must be determined accurately during design and development. The operating center, pre-adjusted frequency, rated operating mode, use category and type of protection must be taken into account.
For marine electrical appliances that are disconnected from the power supply, the rated current can be called the maximum rated output power of the motor when it is working normally, which is used to represent or supplement the relationship between the rated current and the power supply. 5. 3. 2. 4 Rated uninterrupted current (1.)
The rated uninterrupted current of marine electrical appliances must be determined during design and development, that is, the current that the device can carry in uninterrupted working mode. 5.3.3 Rated frequency
The rated frequency of marine electrical appliances is the power supply frequency for which the marine electrical appliances are designed. Marine electrical appliances can be designed to be suitable for several rated frequencies or a certain frequency range: the rated frequency of marine electrical appliances shall comply with the provisions of GB4988.
5 3. 4 Rated working system
Under normal circumstances, the electrical appliances shall have the following working system. 6.40
W.5.3.4.1 Eight-hour working system
HU/T3783--.94
The eight-hour working system is a system in which the main contacts of marine electrical appliances remain closed for a long enough time to achieve thermal equilibrium, but the current can be disconnected after eight hours. The agreed heating current and agreed heat dissipation current of marine electrical appliances are determined by the working system. 5.3.4.2 Uninterrupted working system
The uninterrupted working system is a system without an idle period, that is, its main contacts remain closed and carry a stable current for more than 24 hours (weeks, months or years) without interruption. The difference between the uninterrupted working system and the eight-hour working system is that the accumulation of delamination and dust on the contacts leads to deterioration of heating. For marine electrical appliances used in the uninterrupted working system, measures such as capacity reduction and special design (for example, using silver or silver-based contacts) can be adopted. 5.3.4.3 Intermittent cycle working system (repeated short-term working system or intermittent cycle working system for short) The intermittent cycle working system refers to the working system in which the load time of the main contacts (conductors) of the electrical appliance and its no-load time have a specified ratio, and both times are too short to make the electrical appliance reach thermal equilibrium. The intermittent cycle working system uses current, ball-hour on-off operation lead The load factor is the ratio of the power-on time (e) to the on-off operation cycle (t), usually expressed as a fraction. The standard values of the load factor (power-on duration) are 15%, 25%, 4% and 61%: h.
Marine electrical appliances can be divided into the following levels according to the number of on-off operation cycles they can perform per hour: Level 1
120||tt ||Level 300
(600) level
Level 1260
(1800) level
Level 3000
Level 12000
Level 120
1 time/h
3 times/h
12 times/h
30 times/h
120 times/h
300 times/h
(Go 0.000 times/h
12 times/h
(18u model)
3 000 times/h
12(100 times/h
30000 times/h
120000 times/h
3o0soft/h
For the intermittent cycle system with a large number of on-off operation cycles per hour, the rated working voltage should be specified according to the known actual number of on-off operation cycles or according to the specified number of on-off operation cycles during development, and meet the following formula: f or hx
The characteristic parameter representation method of the switchgear suitable for intermittent cycle operation is as follows: for example, the intermittent cycle working system with a current of 100A for 5min on and 2min can be expressed as 1004, 12 levels, 40%. 5.3.4.4 Short-time working system
W.G0/T 3783...94
Short-time working system is a system in which the main head of marine electrical appliances is kept closed so as to reach thermal equilibrium. The loaded time is separated by the no-load time, and the no-load time is sufficient for the temperature of the device to recover to the same temperature as the mass temperature. The standard value of the power-on time of the short-time working system is 3,113.6: mm5. 3. 4. 5 Cycle working system 1. Cycle working system
is a working system that is always designed to run repeatedly regardless of stable load or variable load. 5.3.5 Normal load and overload characteristics
The basic requirements for the physical properties of marine electrical appliances under normal load and overload conditions are as follows: 5.3.5.1 Withstand load current (switching on and off the motor quickly) The electrical appliances used to switch the motor on and off should be able to withstand the thermal effect caused by the overload during the operation of the motor product and accelerate to the positive speed. The specific requirements under various overload conditions are specified in the relevant product standards. 5.3.5.2 The rated connecting capacity of marine electrical appliances is the current value that is connected under the specified connecting conditions and should be specified in the product standards. The connecting conditions are as follows:
The external voltage before connection:
b. Characteristics of the test circuit.
For AC, the rated connecting capacity is expressed by the effective value of the symmetrical component of the steady current. The current peak value during the first half-wave after the positive contact of the temporary electrical appliance is connected is significantly greater than the steady-state current peak value that determines the connecting capacity. The current peak value of the half-wave is preferably determined by the circuit power factor and the voltage phase at the moment of connection. Marine electrical appliances should be able to receive AC currents with rated current capacity, regardless of the internal DC component, as long as the power is within the range specified in the relevant product standards. 5.3.5.3 Rated breaking capacity
The rated breaking capacity of marine electrical appliances is the current value that can be automatically broken under normal conditions. For AC currents, it is expressed as a symmetrical effective value. It should not be specified in the product standards. The breaking conditions should be as follows: H. Test characteristics 1
b: Two-frequency (or DC) recovery indication.
Marine electrical appliances should be able to break the rated breaking capacity and below. For switchgear, there can be a certain rated breaking assumption. The breaking capacity is for a certain operation and use category.
5.3.6 Short-circuit characteristics
Marine electrical appliances shall take into account the following requirements under short-circuit conditions 5.3.6.1 Rated short-time withstand current (1
The rated short-time withstand current of an electrical appliance is the short-time withstand current value that it can carry without damage under the test conditions specified in the relevant international standards, and shall be specified in the product standards. 5.3.6.2 Rated short-circuit connecting capacity (7..) The rated connecting capacity of a marine electrical appliance is the rated current that can be connected under the specified working conditions (AC or DC) and the specified time interval, and shall be specified in the product standards. 5.3.6. 3 Short-circuit breaking capacity (SPC) The rated short-circuit breaking capacity of marine electrical appliances is the current value that can be broken under the rated current (AC or DC) and the specified constant (current), expressed in terms of the effective value of the current. 5.3.6.4 Rated limiting short-circuit current
The rated limiting short-circuit current of marine electrical appliances is the expected short-circuit current value that the short-circuit protection device (SCP) is used as the protection device under the test conditions specified in the product standard. The rated limiting short-circuit current of the marine electrical appliances is the expected short-circuit current value that the short-circuit protection device can withstand ...1 Eight-hour T working system
HU/T3783--.94
Eight-hour working system is that the main contacts of marine electrical appliances remain closed and stable for a long enough time to achieve thermal equilibrium, but the current can be disconnected after eight hours! The agreed heating current and agreed heat dissipation current of marine electrical appliances are determined by the working system. 5.3.4.2 Uninterrupted working system
The uninterrupted working system is a system without an idle period, that is, its main contacts remain closed and carry a stable current for more than 24 hours (weeks, months or years) without interruption. The difference between the uninterrupted working system and the eight-hour working system is that the accumulation of delamination and dust on the contacts leads to deterioration of heating. For marine electrical appliances used in the uninterrupted working system, measures such as capacity reduction and special design (for example, using silver or silver-based contacts) can be adopted. 5.3.4.3 Intermittent cycle working system (repeated short-term working system or intermittent cycle working system for short) The intermittent cycle working system refers to the working system in which the load time of the main contacts (conductors) of the electrical appliance and its no-load time have a specified ratio, and both times are too short to make the electrical appliance reach thermal equilibrium. The intermittent cycle working system uses current, ball-hour on-off operation lead The load factor is the ratio of the power-on time (e) to the on-off operation cycle (t), usually expressed as a fraction. The standard values of the load factor (power-on duration) are 15%, 25%, 4% and 61%: h.
Marine electrical appliances can be divided into the following levels according to the number of on-off operation cycles they can perform per hour: Level 1
120||tt ||Level 300
(600) level
Level 1260
(1800) level
Level 3000
Level 12000
Level 120
1 time/h
3 times/h
12 times/h
30 times/h
120 times/h
300 times/h
(Go 0.000 times/h
12 times/h
(18u model)
3 000 times/h
12(100 times/h
30000 times/h
120000 times/h
3o0soft/h
For the intermittent cycle system with a large number of on-off operation cycles per hour, the rated working voltage should be specified according to the known actual number of on-off operation cycles or according to the specified number of on-off operation cycles during development, and meet the following formula: f or hx
The characteristic parameter representation method of the switchgear suitable for intermittent cycle operation is as follows: for example, the intermittent cycle working system with a current of 100A for 5min on and 2min can be expressed as 1004, 12 levels, 40%. 5.3.4.4 Short-time working system
W.G0/T 3783...94
Short-time working system is a system in which the main head of marine electrical appliances is kept closed so as to reach thermal equilibrium. The loaded time is separated by the no-load time, and the no-load time is sufficient for the temperature of the device to recover to the same temperature as the mass temperature. The standard value of the power-on time of the short-time working system is 3,113.6: mm5. 3. 4. 5 Cycle working system 1. Cycle working system
is a working system that is always designed to run repeatedly regardless of stable load or variable load. 5.3.5 Normal load and overload characteristics
The basic requirements for the physical properties of marine electrical appliances under normal load and overload conditions are as follows: 5.3.5.1 Withstand load current (switching on and off the motor quickly) The electrical appliances used to switch the motor on and off should be able to withstand the thermal effect caused by the overload during the operation of the motor product and accelerate to the positive speed. The specific requirements under various overload conditions are specified in the relevant product standards. 5.3.5.2 The rated connecting capacity of marine electrical appliances is the current value that is connected under the specified connecting conditions and should be specified in the product standards. The connecting conditions are as follows:
The external voltage before connection:
b. Characteristics of the test circuit.
For AC, the rated connecting capacity is expressed by the effective value of the symmetrical component of the steady current. The current peak value during the first half-wave after the positive contact of the temporary electrical appliance is connected is significantly greater than the steady-state current peak value that determines the connecting capacity. The current peak value of the half-wave is preferably determined by the circuit power factor and the voltage phase at the moment of connection. Marine electrical appliances should be able to receive AC currents with rated current capacity, regardless of the internal DC component, as long as the power is within the range specified in the relevant product standards. 5.3.5.3 Rated breaking capacity
The rated breaking capacity of marine electrical appliances is the current value that can be automatically broken under normal conditions. For AC currents, it is expressed as a symmetrical effective value. It should not be specified in the product standards. The breaking conditions should be as follows: H. Test characteristics 1
b: Two-frequency (or DC) recovery indication.
Marine electrical appliances should be able to break the rated breaking capacity and below. For switchgear, there can be a certain rated breaking assumption. The breaking capacity is for a certain operation and use category.
5.3.6 Short-circuit characteristics
Marine electrical appliances shall take into account the following requirements under short-circuit conditions 5.3.6.1 Rated short-time withstand current (1
The rated short-time withstand current of an electrical appliance is the short-time withstand current value that it can carry without damage under the test conditions specified in the relevant international standards, and shall be specified in the product standards. 5.3.6.2 Rated short-circuit connecting capacity (7..) The rated connecting capacity of a marine electrical appliance is the rated current that can be connected under the specified working conditions (AC or DC) and the specified time interval, and shall be specified in the product standards. 5.3.6. 3 Short-circuit breaking capacity (SPC) The rated short-circuit breaking capacity of marine electrical appliances is the current value that can be broken under the rated current (AC or DC) and the specified constant (current), expressed in terms of the effective value of the current. 5.3.6.4 Rated limiting short-circuit current
The rated limiting short-circuit current of marine electrical appliances is the expected short-circuit current value that the short-circuit protection device (SCP) is used as the protection device under the test conditions specified in the product standard. The rated limiting short-circuit current of the marine electrical appliances is the expected short-circuit current value that the short-circuit protection device can withstand ...1 Eight-hour T working system
HU/T3783--.94
Eight-hour working system is that the main contacts of marine electrical appliances remain closed and stable for a long enough time to achieve thermal equilibrium, but the current can be disconnected after eight hours! The agreed heating current and agreed heat dissipation current of marine electrical appliances are determined by the working system. 5.3.4.2 Uninterrupted working system
The uninterrupted working system is a system without an idle period, that is, its main contacts remain closed and carry a stable current for more than 24 hours (weeks, months or years) without interruption. The difference between the uninterrupted working system and the eight-hour working system is that the accumulation of delamination and dust on the contacts leads to deterioration of heating. For marine electrical appliances used in the uninterrupted working system, measures such as capacity reduction and special design (for example, using silver or silver-based contacts) can be adopted. 5.3.4.3 Intermittent cycle working system (repeated short-term working system or intermittent cycle working system for short) The intermittent cycle working system refers to the working system in which the load time of the main contacts (conductors) of the electrical appliance and its no-load time have a specified ratio, and both times are too short to make the electrical appliance reach thermal equilibrium. The intermittent cycle working system uses current, ball-hour on-off operation lead The load factor is the ratio of the power-on time (e) to the on-off operation cycle (t), usually expressed as a fraction. The standard values of the load factor (power-on duration) are 15%, 25%, 4% and 61%: h.
Marine electrical appliances can be divided into the following levels according to the number of on-off operation cycles they can perform per hour: Level 1
120||tt ||Level 300
(600) level
Level 1260
(1800) level
Level 3000
Level 12000
Level 120
1 time/h
3 times/h
12 times/h
30 times/h
120 times/h
300 times/h
(Go 0.000 times/h
12 times/h
(18u model)
3 000 times/h
12(100 times/h
30000 times/h
120000 times/h
3o0soft/h
For the intermittent cycle system with a large number of on-off operation cycles per hour, the rated working voltage should be specified according to the known actual number of on-off operation cycles or according to the specified number of on-off operation cycles during development, and meet the following formula: f or hx
The characteristic parameter representation method of the switchgear suitable for intermittent cycle operation is as follows: for example, the intermittent cycle working system with a current of 100A for 5min on and 2min can be expressed as 1004, 12 levels, 40%. 5.3.4.4 Short-time working system
W.G0/T 3783...94
Short-time working system is a system in which the main head of marine electrical appliances is kept closed so as to reach thermal equilibrium. The loaded time is separated by the no-load time, and the no-load time is sufficient for the temperature of the device to recover to the same temperature as the mass temperature. The standard value of the power-on time of the short-time working system is 3,113.6: mm5. 3. 4. 5 Cycle working system 1. Cycle working system
is a working system that is always designed to run repeatedly regardless of stable load or variable load. 5.3.5 Normal load and overload characteristics
The basic requirements for the physical properties of marine electrical appliances under normal load and overload conditions are as follows: 5.3.5.1 Withstand load current (switching on and off the motor quickly) The electrical appliances used to switch the motor on and off should be able to withstand the thermal effect caused by the overload during the operation of the motor product and accelerate to the positive speed. The specific requirements under various overload conditions are specified in the relevant product standards. 5.3.5.2 The rated connecting capacity of marine electrical appliances is the current value that is connected under the specified connecting conditions and should be specified in the product standards. The connecting conditions are as follows:
The external voltage before connection:
b. Characteristics of the test circuit.
For AC, the rated connecting capacity is expressed by the effective value of the symmetrical component of the steady current. The current peak value during the first half-wave after the positive contact of the temporary electrical appliance is connected is significantly greater than the steady-state current peak value that determines the connecting capacity. The current peak value of the half-wave is preferably determined by the circuit power factor and the voltage phase at the moment of connection. Marine electrical appliances should be able to receive AC currents with rated current capacity, regardless of the internal DC component, as long as the power is within the range specified in the relevant product standards. 5.3.5.3 Rated breaking capacity Www.bzxZ.net
The rated breaking capacity of marine electrical appliances is the current value that can be automatically broken under normal conditions. For AC currents, it is expressed as a symmetrical effective value. It should not be specified in the product standards. The breaking conditions should be as follows: H. Test characteristics 1
b: Two-frequency (or DC) recovery indication.
Marine electrical appliances should be able to break the rated breaking capacity and below. For switchgear, there can be a certain rated breaking assumption. The breaking capacity is for a certain operation and use category.
5.3.6 Short-circuit characteristics
Marine electrical appliances shall take into account the following requirements under short-circuit conditions 5.3.6.1 Rated short-time withstand current (1
The rated short-time withstand current of an electrical appliance is the short-time withstand current value that it can carry without damage under the test conditions specified in the relevant international standards, and shall be specified in the product standards. 5.3.6.2 Rated short-circuit connecting capacity (7..) The rated connecting capacity of a marine electrical appliance is the rated current that can be connected under the specified working conditions (AC or DC) and the specified time interval, and shall be specified in the product standards. 5.3.6. 3 Short-circuit breaking capacity (SPC) The rated short-circuit breaking capacity of marine electrical appliances is the current value that can be broken under the rated current (AC or DC) and the specified constant (current), expressed in terms of the effective value of the current. 5.3.6.4 Rated limiting short-circuit current
The rated limiting short-circuit current of marine electrical appliances is the expected short-circuit current value that the short-circuit protection device (SCP) is used as the protection device under the test conditions specified in the product standard. The rated limiting short-circuit current of the marine electrical appliances is the expected short-circuit current value that the short-circuit protection device can withstand under the test conditions specified in the product standard. The rated limiting short-circuit current of the marine electrical appliances is the expected short-circuit current value that the short-circuit protection device can withstand under the test conditions specified in the product standard. The rated limiting short-circuit current of the marine electrical appliances is the specified short-circuit protection device (SCP). ... specified short-circuit protection device (SCP). The rated limiting short-circuit current of the marine electrical appliances is the specified short-circuit protection device (SCP). The rated limiting short-circuit current of the marine electrical appliances is the specified short-circuit protection device (SCP). The rated limiting short-circuit current of the marine electrical appliances is the specified short-circuit protection device. The rated limiting short-circuit current of the marine electrical appliances is the specified short-circuit protection device. The rated limiting short-circuit current of the marine electrical appliances is the specified short-circuit protection device. The rated limiting short-circuit current of the marine electrical appliances is the specified short-circuit protection device. The rated limiting short-circ
Marine electrical appliances can be divided into the following levels according to the number of tearing operation cycles they can perform per hour: Level 1
120 levels
300 levels
(600) levels
1260 levels
(1800) levels
3000 levels
12000 levels
120 levels
1 time/h
3 times/h
12 times/h
30 times/h
120 times/h
300 times/h
(Go Europe/h)
12 times/h
(18u models)
3 000 times/h
12(100 times/h
30000 times/h
120000 times/h
3o0soft/h
For the intermittent cycle operation system with a large number of on-off operation cycles per hour, the rated working voltage should be specified according to the known actual on-off operation cycle number or according to the specified on-off operation cycle number during development, and meet the following formula: f or hx
The characteristic parameter representation method of the switchgear suitable for intermittent cycle operation system, for example, the intermittent cycle operation system with a current of 100A for 5min on and 2min can be expressed as 1004, 12, 40%. 5.3.4.4 Short-time working system
W.G0/T 3783...94
Short-time working system is a system in which the main switch of the ship electrical appliance is closed. The load time is separated by the no-load time in order to reach the thermal equilibrium. The no-load time is sufficient for the temperature of the core to recover to the same temperature as the cold temperature. The standard value of the power-on time of the short-time working system is 3,113.6: mm5. 3. 4. 5. Cycle 1. Operation system
Cycle operation system is a work system designed to run repeatedly regardless of stable load or variable load. 5.3.5 Normal load and overload characteristics
Marine electrical appliances shall meet the following basic requirements under normal load and overload conditions: 5.3.5.1 Withstand (switching on and off) load current The electrical appliances used to switch the motor on and off shall be able to withstand the thermal effect of overload during operation when the motor product is accelerated to a positive speed. The specific requirements under various overload conditions are specified in relevant product standards. 5.3.5.2 The rated switching capacity of marine electrical appliances is the current value that can be switched on under the specified switching conditions and shall be specified in the product standard. The switching conditions are as follows:
External voltage before switching on:
b. Test
For AC, the rated breaking capacity is expressed by the effective value of the symmetrical component of the steady current. During the first half-wave after the positive contact of the temporary electrical appliance is connected, the current peak is significantly greater than the steady current peak that determines the breaking capacity. The current peak of the half-wave depends on the power factor of the circuit and the voltage phase at the moment of connection. Marine electrical appliances should be able to receive AC currents of equal rated breaking capacity, regardless of the inherent DC component, as long as the power is within the range specified in the relevant product standards. 5.3.5.3 Rated breaking capacity
The rated breaking capacity of marine electrical appliances is the current value that can be automatically broken under normal conditions. For AC, it is expressed by the effective value of the symmetrical component, which should not be specified in the product standard. The breaking conditions should be as follows: H. Test characteristics 1
b: Two-frequency (or DC) recovery current.
Marine electrical appliances should be able to disconnect the rated breaking capacity and below the value, for the switch electrical appliances can have a certain rated breaking capacity for a certain working and use category.
5.3.6 Short-circuit characteristics
Marine electrical appliances shall take into account the following requirements under short-circuit conditions 5.3.6.1 Rated short-time withstand current (1
The rated short-time withstand current of an electrical appliance is the short-time withstand current value that it can carry without damage under the test conditions specified in the relevant international standards, and shall be specified in the product standards. 5.3.6.2 Rated short-circuit connecting capacity (7..) The rated connecting capacity of a marine electrical appliance is the rated current that can be connected under the specified working conditions (AC or DC) and the specified time interval, and shall be specified in the product standards. 5.3.6. 3 Short-circuit breaking capacity (SPC) The rated short-circuit breaking capacity of marine electrical appliances is the current value that can be broken under the rated current (AC or DC) and the specified constant (current), expressed in terms of the effective value of the current. 5.3.6.4 Rated limiting short-circuit current
The rated limiting short-circuit current of marine electrical appliances is the expected short-circuit current value that the short-circuit protection device (SCP) is used as the protection device under the test conditions specified in the product standard. The rated limiting short-circuit current of the marine electrical appliances is the expected short-circuit current value that the short-circuit protection device can withstand ...
Marine electrical appliances can be divided into the following levels according to the number of tearing operation cycles they can perform per hour: Level 1
120 levels
300 levels
(600) levels
1260 levels
(1800) levels
3000 levels
12000 levels
120 levels
1 time/h
3 times/h
12 times/h
30 times/h
120 times/h
300 times/h
(Go Europe/h)
12 times/h
(18u models)
3 000 times/h
12(100 times/h
30000 times/h
120000 times/h
3o0soft/h
For the intermittent cycle operation system with a large number of on-off operation cycles per hour, the rated working voltage should be specified according to the known actual on-off operation cycle number or according to the specified on-off operation cycle number during development, and meet the following formula: f or hx
The characteristic parameter representation method of the switchgear suitable for intermittent cycle operation system, for example, the intermittent cycle operation system with a current of 100A for 5min on and 2min can be expressed as 1004, 12, 40%. 5.3.4.4 Short-time working system
W.G0/T 3783...94
Short-time working system is a system in which the main switch of the ship electrical appliance is closed. The load time is separated by the no-load time in order to reach the thermal equilibrium. The no-load time is sufficient for the temperature of the core to recover to the same temperature as the cold temperature. The standard value of the power-on time of the short-time working system is 3,113.6: mm5. 3. 4. 5. Cycle 1. Operation system
Cycle operation system is a work system designed to run repeatedly regardless of stable load or variable load. 5.3.5 Normal load and overload characteristics
Marine electrical appliances shall meet the following basic requirements under normal load and overload conditions: 5.3.5.1 Withstand (switching on and off) load current The electrical appliances used to switch the motor on and off shall be able to withstand the thermal effect of overload during operation when the motor product is accelerated to a positive speed. The specific requirements under various overload conditions are specified in relevant product standards. 5.3.5.2 The rated switching capacity of marine electrical appliances is the current value that can be switched on under the specified switching conditions and shall be specified in the product standard. The switching conditions are as follows:
External voltage before switching on:
b. Test
For AC, the rated breaking capacity is expressed by the effective value of the symmetrical component of the steady current. During the first half-wave after the positive contact of the temporary electrical appliance is connected, the current peak is significantly greater than the steady current peak that determines the breaking capacity. The current peak of the half-wave depends on the power factor of the circuit and the voltage phase at the moment of connection. Marine electrical appliances should be able to receive AC currents of equal rated breaking capacity, regardless of the inherent DC component, as long as the power is within the range specified in the relevant product standards. 5.3.5.3 Rated breaking capacity
The rated breaking capacity of marine electrical appliances is the current value that can be automatically broken under normal conditions. For AC, it is expressed by the effective value of the symmetrical component, which should not be specified in the product standard. The breaking conditions should be as follows: H. Test characteristics 1
b: Two-frequency (or DC) recovery current.
Marine electrical appliances should be able to disconnect the rated breaking capacity and below the value, for the switch electrical appliances can have a certain rated breaking capacity for a certain working and use category.
5.3.6 Short-circuit characteristics
Marine electrical appliances shall take into account the following requirements under short-circuit conditions 5.3.6.1 Rated short-time withstand current (1
The rated short-time withstand current of an electrical appliance is the short-time withstand current value that it can carry without damage under the test conditions specified in the relevant international standards, and shall be specified in the product standards. 5.3.6.2 Rated short-circuit connecting capacity (7..) The rated connecting capacity of a marine electrical appliance is the rated current that can be connected under the specified working conditions (AC or DC) and the specified time interval, and shall be specified in the product standards. 5.3.6. 3 Short-circuit breaking capacity (SPC) The rated short-circuit breaking capacity of marine electrical appliances is the current value that can be broken under the rated current (AC or DC) and the specified constant (current), expressed in terms of the effective value of the current. 5.3.6.4 Rated limiting short-circuit current
The rated limiting short-circuit current of marine electrical appliances is the expected short-circuit current value that the short-circuit protection device (SCP) is used as the protection device under the test conditions specified in the product standard. The rated limiting short-circuit current of the marine electrical appliances is the expected short-circuit current value that the short-circuit protection device can withstand under the test conditions specified in the product standard. The rated limiting short-circuit current of the marine electrical appliances is the expected short-circuit current value that the short-circuit protection device can withstand under the test conditions specified in the product standard. The rated limiting short-circuit current of the marine electrical appliances is the specified short-circuit protection device (SCP). ... specified short-circuit protection device (SCP). The rated limiting short-circuit current of the marine electrical appliances is the specified short-circuit protection device (SCP). The rated limiting short-circuit current of the marine electrical appliances is the specified short-circuit protection device (SCP). The rated limiting short-circuit current of the marine electrical appliances is the specified short-circuit protection device. The rated limiting short-circuit current of the marine electrical appliances is the specified short-circuit protection device. The rated limiting short-circuit current of the marine electrical appliances is the specified short-circuit protection device. The rated limiting short-circuit current of the marine electrical appliances is the specified short-circuit protection device. The rated limiting short-circ3 Short-circuit breaking capacity (SPC) The rated short-circuit breaking capacity of marine electrical appliances is the current value that can be broken under the rated current (AC or DC) and the specified constant (current), expressed in terms of the effective value of the current. 5.3.6.4 Rated limiting short-circuit current
The rated limiting short-circuit current of marine electrical appliances is the expected short-circuit current value that the short-circuit protection device (SCP) is used as the protection device under the test conditions specified in the product standard. The rated limiting short-circuit current of the marine electrical appliances is the expected short-circuit current value that the short-circuit protection device can withstand under the test conditions specified in the product standard. The rated limiting short-circuit current of the marine electrical appliances is the expected short-circuit current value that the short-circuit protection device can withstand under the test conditions specified in the product standard. The rated limiting short-circuit current of the marine electrical appliances is the specified short-circuit protection device (SCP). ... specified short-circuit protection device (SCP). The rated limiting short-circuit current of the marine electrical appliances is the specified short-circuit protection device (SCP). The rated limiting short-circuit current of the marine electrical appliances is the specified short-circuit protection device (SCP). The rated limiting short-circuit current of the marine electrical appliances is the specified short-circuit protection device. The rated limiting short-circuit current of the marine electrical appliances is the specified short-circuit protection device. The rated limiting short-circuit current of the marine electrical appliances is the specified short-circuit protection device. The rated limiting short-circuit current of the marine electrical appliances is the specified short-circuit protection device. The rated limiting short-circ3 Short-circuit breaking capacity (SPC) The rated short-circuit breaking capacity of marine electrical appliances is the current value that can be broken under the rated current (AC or DC) and the specified constant (current), expressed in terms of the effective value of the current. 5.3.6.4 Rated limiting short-circuit current
The rated limiting short-circuit current of marine electrical appliances is the expected short
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.