JB/T 5777.2-2002 General technical conditions for control and relay protection screens (cabinets, tables) for secondary circuits in power systems
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JB/T5777.291991
2002-12-01
JB/T5777.2—2002
This standard is This standard is revised on the basis of JB/T5777.2-1991 "General Technical Conditions for Control and Relay Protection Panels (Cabinets and Stations) for Secondary Circuits in Power Systems" (hereinafter referred to as the original standard). The main changes compared to 2-1991 are as follows: the cited standard is changed to the latest version
The writing format is according to GB/T1.1-2000 "Standardization Work Guidelines Part 1: Standard Structure and Writing Rules" and GB/T1 .2 - According to the provisions of the 2002 "Standardization Work Guidelines Part 2: Methods for Determining Normative Technical Elements and Contents in Standards": the protection level requirements are changed to the provisions of GB4208--1993; the size limit deviation and shape in the structural requirements are Position tolerances have been added in accordance with GB/T1800.3-1998 and GB/T1184-1996
-added "5.13.2 Ability to withstand interference from electrostatic discharge: 5.13.3 Ability to withstand interference from radiated electromagnetic fields; 5.13. 4. Ability to withstand fast transient interference":
Remove "5.15.1~5.15.7" in the original standard, and change the content of 5.15 to: Functional requirements of various basic relays used on screens, cabinets, and stations To meet the requirements of its enterprise product standards: remove 5.17 in the original standard and merge its content into humanistic standards 5.17 and 5.18: add "5.18.8 distance protection; 5.18.13 overvoltage protection; 5.18.14 low voltage protection" Chapter 8 in the original standard is changed to "8 Marks, Labels, Instructions for Use", and the content of the instructions for use is added in accordance with the provisions of GB/T9969.1;
Change Chapter 9 in the source standard to " 9 Packaging, transportation and storage"; add "10 Completeness of supply":
Add "11 Quality Assurance".
This standard replaces JB/T5777.2-1991. This standard is developed by China Proposed by the Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee for Standardization of Measuring Relays and Protection Equipment. The drafting unit of this standard is: Xuchang Relay Research Institute. The drafter of this standard is: Li Shaofeng. The version release status is: JB616—1984JB/T5777.2—1991. 1 Scope
General technical conditions for control and relay protection screens (cabinets, stations) for secondary circuits in power systems
JB/ T5777.2—2002
This standard specifies the technical requirements, test methods and inspection rules for control and relay protection screens (cabinets, tables). This standard applies to control panels (cabinets, stations) and protection panels (cabinets, stations) used in secondary circuits of power systems. It only includes protection of transmission lines with voltage levels below 110kV and relay protection of water and thermal power plants with a single unit capacity of 25MW and below. ) [hereinafter referred to as screens (cabinets, tables)] and other electrical complete sets, as the main basis for product design and manufacturing quality assessment. This standard does not apply to transmission line protection screens, main equipment protection screens, DC screens (cabinets) and nickel-cadmium battery DC power supply screens (cabinets) with voltage levels of 110kV and above. Such products are regulated by other standards. This standard does not apply to low-voltage complete sets of switchgear and other products. 2 Normative reference documents
The provisions in the following documents become provisions of this standard through reference in this standard. For dated reference documents, all subsequent amendments (excluding corrigenda) or revisions do not apply to this standard. However, parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. Version. For undated referenced documents, the latest edition applies to this standard. GB/T1184-1996 Shape and position tolerances, unspecified tolerance values ??(eqvISO2768-2:1989) GB/T1800.3--1998 Limits and fit basis Part 3 Standard tolerance and basic deviation value table (eqVISO286-1:1988)
GB/T2423.41993 Basic environmental test procedures for electrical and electronic products Test Db: Alternating damp heat test method (eqVEC60068-2-30:1980)
GB/T26821981 Indicator lights and Button color GB4208-1993 Shell protection level (IP code) (eqIEC60529:1989) GB/T4728.1 General principles of graphical symbols for electrical diagrams GB/T4728.2~13
Graphic symbols for electrical diagrams||tt| |GB4884-1985 Marking of insulated wires (eqVIEC60391:1972) GB/T6988.13-1997 Preparation of documents for electrical technology GB/T71591987 General rules for the preparation of text symbols in electrical technology (neEC60204-2:1984) GB/T7261-2000 Relays and basic test methods for devices GB/T 7266-1987
GB/T7267—1987
GB 9969.1--1998
Basic dimensions of electrical console for secondary circuit of power system General Instructions for Use of Industrial Products Series of Basic Dimensions of Loop Control, Protective Screens and Cabinets
GB/T112872000 Electrical Relays Part 21: Measurement of Vibration, Impact, Collision and Seismic Tests of Relays and Protective Devices Part 1: Vibration Test ( Sinusoidal) (idtIEC60255-21-1: 1988) GB/T14537-1993 Impact and collision test of measuring relays and protective devices (idtIEC60255-21-2) 5 Electrical relays Part 22: Electrical interference test of measuring relays and protective devices Part 2 3 articles: GB/T 14598.9-1995
Radiated electromagnetic field interference test (idtIEC60255-22-3: 1989) GB/T 14598.10-1996 Electrical relays Part 22: Electrical interference test for measuring relays and protective devices Part 2 4 articles: Fast transient interference test (idtIEC60255-22-4:1992) 1
JB/T5777.2-2002
GB/T14598.13-1998 Measuring electrical interference of relays and protective devices Test Part 1: 1MHz pulse group interference test (eqvIEC60255-22-1:1988)
GB/T14598.14-1998 Electrical interference test for measuring relays and protective devices Part 2: Electrostatic discharge test (idtIEC60255 -22-2:1996)
GB16836--1997 General requirements for safety design of measuring relays and protective devices JB/T5777.3-2002 Control and relay protection screens (cabinets, tables) for secondary circuits of power systems JB/T7828-1995 Technical conditions for packaging, storage and transportation of relays and their devices EC60255-5: 2001 Measurement of insulation coordination of relays and protective equipment - Requirements and tests
3 rated parameters
Screen (cabinet, table) The rating of the internal electrical independent circuit shall be selected from the following values. 3.1 AC circuit
AC circuit ratings are:
a) Voltage: 100/V3V, 100V, 220V, 380V; b) Current: 1A, 5A;
c) Frequency: 50Hz, 60Hz.
3.2 DC circuit
Voltage: 48V, 110V, 220V.
Note: If rated parameters other than the above values ??are required, they must be determined by the user and the manufacturer through negotiation. 4 Conditions of use
4.1 Normal use conditions
Basic test methods
Screens (cabinets, tables) that comply with this standard are suitable for the following conditions and can work normally. If the components used in the screen (cabinet, table) are not suitable for these conditions, appropriate measures should be taken to ensure their normal operation. 4.1.1 The ambient temperature
is specified by the company's product standards.
4.1.2 Relative humidity of ambient air
a) The average maximum relative humidity does not exceed 50% when the maximum temperature is 40°C; b) The monthly average maximum relative humidity of the wettest month is 90%, At the same time, the monthly average minimum temperature in this month is 25℃, and there is no condensation on the surface. 4.1.3Atmospheric pressure
Atmospheric pressure is 80kPa～110kPa.
4.1.4 Working position
Vertical ground installation.
4.1.5 Magnetic induction intensity of external magnetic field
shall not exceed 0.5mT in any direction.
4.1.6 Power supply frequency
Not exceeding 50Hz±1Hz
4.1.7 Change range of current power supply voltage
a) When the rated voltage is 220V, 110V, the change The range is 80% ~ 110% of the rated value; b) When the rated voltage is 48V, the changing range is 90% ~ 110% of the rated value. 4.1.8 Other requirements for the place of use
a) The place of use shall not have vibration response and impact response exceeding the severity level 1 specified in GB/T11287-2000 and GB/T14537-1993: || tt | | 2 | | tt | water vapor and serious mold: c) There should be facilities to protect against rain, snow, wind and sand. 4.2 Special conditions of use
Requirements for use under the following conditions:
a) When the normal use conditions specified in this standard are exceeded (such as: used for corrosion, explosion hazard, etc.), the user It should be proposed to the manufacturer when ordering and negotiated to resolve:
b) Products used in tropical environmental conditions, in addition to meeting this standard, should also meet the requirements for products under tropical environmental conditions. 5 Technical requirements
5.1 Limit values ??of extreme temperature range
The limit values ??of extreme temperature range are -25℃ and 70℃. Screens (cabinets, tables) that do not apply excitation at the extreme value should not cause any irreversible damage. After returning to normal working conditions, it should be able to work reliably. 5.2 Structural requirements
5.2.1 The structural design of the screen (cabinet, table) should consider component installation, wiring, operation and maintenance requirements. 5.2.2 The appearance and installation dimensions of screens and cabinets should comply with the requirements of GB/T7267-1987: the appearance dimensions of the table should comply with the requirements of GB/T7266-1987. For traditional size screens and cabinets with a height × width × depth of 2300mm × 800mm × 550mm, they are only allowed to be used when the project is expanded to unify the screens (cabinets).
5.2.3 The structure should be made of materials that can withstand the mechanical, electrical and thermal stress of the product, and should have sufficient strength and mesh. Reinforcement measures should be taken for larger openings or continuous openings on the panel, and reinforcement measures should be taken for the installation of large operating components. 5.2.4 The limit deviations of screen and cabinet structure dimensions should comply with the following regulations: when the height is 500mm~1600mm, ±1.0mm, ±1.5mm; when the height is 1600mm~2000mm, ±1.5mm, ±2.0mm; when the height is greater than 2000mm time, ±2.0mm, ±2.5mm; width is -1.0mm, -2.0mm
depth is ±1.0mm, ±1.5mm;
The dimensional limit deviation of the table is not specified for the time being. 5.2.5 The geometric tolerance of screens and cabinets shall comply with the following regulations: 5.2.5.1 The flatness of the panel is: (1000:2) mm. 5.2.5.2 Verticality is: (1000:2) mm. 5.2.5.3 The position tolerance of panel openings is 0.5mm. The size tolerance of the holes should meet the installation requirements of components. 5.2.6 The following basic measures should be considered for the screen (cabinet, table) structure: foot installation holes and screen splicing holes. :
a)
b)
Lifting facilities to facilitate product transportation:
Wiring holes for debugging and inspection of wiring, which should be decorated with nameplates or other decorations when not in use Cover: c)
Safe grounding measures and ensure the continuity of the protective circuit. The grounding connection should have anti-rust and anti-pollution measures. The grounding point should be d)
Obviously marked: || tt||e) The protection level of the shell should be in accordance with the regulations of GB4208-1993. 5.2.7 Other requirements:
5.2.7.1 After assembly, the structure should be neat and beautiful. Each welding joint should be free of defects such as cracks, burn-through, undercuts, gas edges, and slag inclusions, and welding slag should be removed in time.
5.2.7.2 Each fastened connection should be firm and reliable, and all fasteners should have anti-corrosion plating or coating. Anti-loosening measures must be taken for fastened connections, and copper materials must be used for parts that are both connected and conductive (except for connectors constituting a protective circuit). 3 | | tt | | JB/T5777.2—2002 | The opening angle of the door should not be less than 90". If the user requests it, a limit mechanism should be installed. 5.2.7.4 When adding lighting to the screen (cabinet, table) structure according to the needs of the user, the light bulbs should be replaced safely without interrupting the operation of the equipment. Normal operation.
5.2.7.5 The flip-up angle of the screen or table should be no less than 45°. There should be a positioning mechanism after the flip-up plate is flipped up to facilitate maintenance and repair. The design of the flip-up plate structure should be as small as possible. The installation of components is restricted. 5.2.7.6 For current and voltage measurement circuits, there should be facilities for interchange and inspection under working conditions (such as test terminals or test terminals). 5.3 Surface coating and system simulation diagram requirements 5.3.1 Screen. All surfaces that should be coated (cabinets, tables) should be pre-treated before coating. The color of the surface coating layer should meet the user's requirements (the user can provide the color code) or be specified by the relevant enterprise standards. 5.3.2 The coating layer should be. It has good adhesion, should be uniform and smooth, and no defects such as sags, shrinkage, and shrinkage holes are allowed. The surface should not be glare to avoid affecting the monitoring effect.
5.3.3 The system simulation diagram should be based on the operating voltage. Level, marked according to the colors specified in Table 1. Table 1 Voltage level and analog line color
Serial number
2
3
4| |tt||5
6
7
9
10
11
12
13||tt ||14
15
16
17
18
AC
流
电
Voltage
Operation voltage type and level kv
DC voltage
0.10
G.23
(0.40)
3.00||tt ||6.00
10.00
13.80*
15.75*
18.00*
20.00*
35.00
63.00| |tt||110.00
(154.00)
220.00
330.00
500.00
Note: The voltage levels in brackets are non-standard voltage values. *" is only used as generator voltage. Color
brown
light gray
dark gray
yellow
deep continued
deep acid blue
iron red
light green
medium green
pink
iron yellow
lemon
orange| |tt||Vermilion
Heaven blue
Purple red
White
Light yellow
The width of the analog busbar on the 5.3.4 screen (cabinet) is 12mm, the width of the vertical branch analog line is 8mm, and the width of each analog graphic line is 8mm; in principle, the width of the analog busbar and branch analog line on the platform is the same as the screen, but for platforms with dense components, the width of the analog busbar is also allowed to be JB/ T5777.2—2002
8mm, the simulated width of the longitudinal branches is 6mm, and the line width of each simulated graphic is 6mm. If there are special requirements, it shall be determined by the user and the manufacturer through consultation.
5.3.5 Analog lines should be firmly attached, not easily damaged, uniform in color, well-proportioned and beautiful in layout. The drawing of analog graphics should comply with GB/T4728.1~13, GB/T6988.1~3-1997 and GB/ T7159-1987 regulations. The heights of the same-analog busbars of two adjacent screens (cabinets, desks) in a screen (cabinet, desk) group should be consistent, and the width and color of analog lines and analog graphic lines with the same function in a screen (cabinet, desk) group should be consistent. 5.4 Component installation requirements
5.4.1. The components installed on the screen (cabinet, table) should have product certificates or documents proving quality. Components for which product production licenses have been issued should also provide corresponding certificates or marks and be installed in accordance with the manufacturer's instructions. Obsolete, outdated and high-energy-consuming components must not be used.
5.4.2 Weak current components selected in strong current systems should be protected by double insulation. 5.4.3 The colors of display components and buttons should be selected according to their uses and in accordance with the regulations of GB/T2682--1981. 5.4.4 Components are generally not arranged within 250mm of the screen () panel from the ground. 5.4.5 The components and terminal strips installed behind the screen (cabinet, table) should not hinder the maintenance of other components. The components behind the screen should be arranged neatly and in clear layers. tt , to ensure that surrounding components and wire bundles are not affected. 5.4.7 The distance between two charged conductors or between a charged conductor and an exposed uncharged conductor shall comply with the requirements for electrical clearance and creepage distance specified in 5.7,
The electrical clearance between small busbars, busbars or exposed live conductors at different levels, as well as between exposed live conductors and uninsulated non-live conductors, is not less than 12mm, and the creepage distance is not less than 20mm. . 5.4.8 Electrical components, small busbar seats, busbars or terminal strips should be marked with text symbols (or numbers, marks) that comply with the design drawings, and should be clear, durable and easy to observe. 5.5 Requirements for busbars and connecting wires
5.5.1 The phase sequence and color of small busbars, busbars and main circuit wires should comply with the requirements in Table 2. Table 2 Wire phase sequence and color
group
A phase
B phase
C phase
positive pole
negative pole||tt ||Neutral wire
Safety ground wire
Symbol
U
W
L+
L-
N
Protective grounding, PE
E
Note: The installation location is according to the front direction of the screen and cabinet. Paint color
(or insulated wire color)
yellow
green
red
brown
blue
light Blue
yellow and green two-color
vertical arrangement
top
middle
bottom
top
bottom||tt| |Lower
Mutual position of busbar installation
Front and rear arrangement
Back
Middle
Front
Back
Front| |tt||front
horizontal arrangement
left
center
right
left
right
far right| |tt||5.5.2 Except for special circumstances, the relationship between the cross-sectional area and rated value of the connecting wires selected in the screen (cabinet, table) is shown in Table 3. 5.6 Number design and connection of insulated wires
5.6 .1 The conductors should be arranged horizontally and vertically, reasonably arranged, neat and beautiful. It is recommended to use the wiring method of line trough. When using row wire troughs for wiring, the configuration of the row wire troughs should be reasonable, fixed and reliable, and the wire trough covers should have good opening and closing properties. JB/T5777.2--2002
Circuit characteristics
AC voltage circuit V
DC voltage circuit V
AC current circuit A
DC current circuit A
Table 3 Voltage level and wire cross-sectional area
Copper core
100~380
≤220
1~5
10
25
40
50
63
80
100
(140)
200
(.300)
500
(450)
≥1.5
1.5
≥2.5
>2.5
2.5
≥4.0
≥6.0
≥6.0
≥10.0
≥16.0
25.0||tt ||250.0
395.0
150.0
Wire cross-sectional area mm2
48V and below are allowed to use wires with a nominal cross-sectional area of ??0.5nm2~1mm. Non-standard values ??are in parentheses. Aluminum core
≥2.5
≥4.0
6.0
≥10.0
16.0
≥25.0
≥35.0| |tt||370.0www.bzxz.net
120.0
≥185.0
5.6.2 The clamp for bundling wires should be strong and reliable and should not damage the outer insulation of the wires. It is prohibited to bundle the wire harness with materials such as nylon wire that can easily damage the insulation. For a wire bundle with a nominal cross-sectional area of ??1.5mm2, the number of wires should generally not exceed 30. Brackets or clamps for fixing the wiring harness should be installed inside the screen (cabinet, table). 5.6.3 For the connection between wires and component terminals or terminal blocks, BVR soft wires are recommended for wires with a cross-section of 6mm2 and below, and cold-pressed terminals should be used: Multi-strand hard wires can be used for wires with a cross-section of 10mm2 and above, and their terminals are cold-pressed. Pliers or hydraulic press for crimping. Cold-pressed connections require firmness and good contact, and copper-aluminum transition joints must be used to connect copper and aluminum wires. The wire terminals should be marked with identification marks, and the wire markings should comply with the regulations of GB48841985.
When using single-strand wires, buffer rings should be made at the wire terminals to prevent wire breakage under vibration and impact. The laying of hard busbars should comply with relevant standards. 5.6.4 When wiring in movable places, such as connecting wires across doors or flaps, multi-stranded copper core insulated flexible wires must be used, leaving a certain length margin, and protected by winding tape, etc., so as not to cause If there is any mechanical damage, measures should be taken to fix the wiring harness.
5.6.5 No joints are allowed in the middle of the connecting wires. More than two wires are not allowed to be connected to each terminal, and measures should be taken to ensure reliable connections.
5.6.6 The wire bundle cannot be laid close to the metal structural parts. When flying over metal components, measures should be taken to protect the wire insulation from damage. 5.6.7 Conductors are not allowed to withstand stress that reduces their normal service life. 5.6.8 The distance between the terminal row and the rear end of the screen (cabinet) - generally not less than 160mm. When two rows of terminals need to be installed on the same side, the distance between them should be no less than 100mm, and the distance between the rear terminal row and the rear end of the screen (cabinet) should be no less than 75mm to facilitate cable laying. 5.6.9 When the user has no other requirements, small busbar terminal blocks that can pass through copper rods with a diameter of 6mm should be provided on both sides of the upper part of the screen (cabinet). The installation position of the small busbar from the screen (cabinet) panel to the back should be no less than 75mm from the screen (cabinet) panel. 5.6.10 The requirements for the location, width and distance from the ground of the grounding bus shall be determined by the user and the manufacturer as needed. 6
5.7 Electrical clearance and creepage distance
According to the relevant regulations of C60255-5:2001. 5.8 Ultimate performance
5.8.1 Unless otherwise specified, the atmospheric conditions for assessing insulation performance should not exceed the following range: a) ambient temperature is 15°C ~ 35°C;
b) relative humidity is 45% ~ 75%:
c) The weather pressure is 86kPa106kPa
The insulation performance assessment is conducted when the screen (cabinet, table) is naturally dry and has no self-heating conditions. 5.8.2 Insulation resistance:
Use a test instrument with an open circuit voltage of 500V to measure the insulation resistance of the relevant parts, which should comply with the following regulations: a) The insulation resistance between each live circuit and the ground (i.e., the metal frame) should not Less than 5M2: b) The insulation resistance between live circuits without electrical connection should not be less than 10M2: JB/T5777.2—2002
c) In-screen DC bus and voltage small bus, disconnect all When connecting other branches, the absolute resistance between the ground and the ground should not be less than 10MQ. 5.8.3 Dielectric strength:
5.8.3.1 The following parts of the screen (cabinet, table) should be subjected to dielectric strength test: a) Between each live circuit and the ground (i.e. metal frame): b) AC circuit and DC Between circuits;
Between the DC bus and the voltage small bus in the screen, when all other connecting branches are disconnected, and the ground (i.e. the metal frame). c)
5.8.3.2 Dielectric strength test voltage value:
5.8.3.The parts listed in 1 shall be subjected to the sine wave test voltage value listed in Table 4 with a frequency of 50Hz±5Hz for a test duration of 1min. The insulation shall not show breakdown or flashover.
Table 4 Dielectric Strength Test Voltage Value
Rated Insulation Voltage
V
M.60
>60~250
>250~500
Test Voltage kv
0.5
2.0
2.5
During sampling test and factory test, the test voltage is allowed to be 10% higher than that specified in Table 5, and the test time is 1s. 5.8.3.3 When the high voltage output terminal of the test voltage source is short-circuited, the current shall not be less than 0.5A, or when half of the specified voltage value is applied to the tested product, the voltage drop of the test voltage source shall be kept less than 10%, and the power supply voltage shall ensure an accuracy of not less than 5%. 5.8.3.4 For circuits excited directly by instrument transformers, the test voltage shall be no less than 2.0 kV. 5.8.3.5 When testing between two circuits that are always at the same potential (e.g. directly connected in phase), the test voltage shall be twice the rated insulation voltage, but not less than 500 V. 5.8.3.6 When conducting dielectric strength tests between contacts that need to be disconnected, the test voltage shall be determined by negotiation between the manufacturer and the user. 5.8.3.7 When the components installed in the panel (cabinet, table) have a rated insulation voltage of 60 V or less, it is allowed to take special protective measures for the components before conducting dielectric strength tests, such as removing the relevant plug-ins or short-circuiting the circuit (equal potential) before conducting the test. 5.8.4 Impulse voltage:
Between each live circuit of the panel (cabinet, table) and the ground (i.e. metal frame), and between the AC circuit and the DC circuit: It should be able to withstand the short-time impulse voltage test of the standard lightning wave. The test voltage value is selected according to one of the following principles: 5.8.4.1 When the test voltage value is 1kV:
a) The auxiliary circuit (power supply circuit) connected to the dedicated power supply of the static relay protection device. The lead is short, and other circuits connected to the power supply will not operate:
b) It is not directly connected to the input excitation circuit of the instrument transformer, or the instrument transformer lead is well shielded and grounded; c) The output circuit is connected to the load with a short lead. 7
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