JB/T 7822-1995 General technical requirements for electrical equipment of gas turbines
Some standard content:
Machinery Industry Standard of the People's Republic of China
JB/T7822-1995
General Technical Conditions for Electrical Equipment of Gas TurbinesPublished on November 24, 1995
Ministry of Machinery Industry of the People's Republic of China
Implementation on July 1, 1996
Machinery Industry Standard of the People's Republic of China
General Technical Conditions for Electrical Equipment of Gas TurbinesSubject Content and Scope of Application
JB/T7822-1995
This standard specifies the general technical conditions for electrical equipment (excluding control equipment) used in conjunction with gas turbines. This standard applies to gas turbines used for power generation Turbine device, for mechanical drive gas turbine device can also refer to the adoption. Reference standards
GB2900.1, 10, 12, 15, 16, 17, 18, 34, 47 Electrical terminology GB755-87
GB763-90
GB1207-86
GB1208-87
GB1984-89
GB1985-89
GB3804-90
GB3906-91
GB732787
GB11022—89||tt| |GB11032-89
JB/T5884-91
GB/T7064
JB/T7074-93
GB740987
Basic technical requirements for rotating electrical machines
Heating of AC high-voltage electrical appliances during long-term operationVoltage transformer
Current transformer
AC high-voltage circuit breakers
AC high-voltage disconnectors and earthing switches
3~63kV AC high-voltage load switches
3~35kV AC metal-enclosed switchgear
Silicon carbide valve arresters for AC systems| |tt||General technical conditions for high-voltage switchgear
AC gapless metal oxide arrester
Gas turbine control and protection system
Technical requirements for turbine-type synchronous motor
General technical conditions for gas turbine generators
Basic technical conditions for excitation systems of large and medium-sized synchronous generatorsGB1094.1~1094.5-85Power transformersGB6450-86
Dry-type power transformers
GB6451.1～6451.2-86Technical parameters and requirements for three-phase oil-immersed power transformersGB7251-87
ZBK36 001-89
GBJ65-83
GB5008.1-91
GB9368-88
GB9369-88
GB10231-88
GB616285
GB4858-84
CBJ16-87
Approved by the Ministry of Machinery Industry on November 24, 1995
Low-voltage complete switchgear
Low-voltage withdrawable complete switchgear
Grounding design specification for industrial and civil power installations Starting lead-acid batteries||tt ||Technical conditions
Nickel-ion batteries
Nickel-ion alkaline batteries
Structural types and basic dimensions of protective relays Electrical interference test of series static relays and protective devices Insulation test of electrical relays
Code for fire protection of building design
1996-07-01 implementation
JB/T7822-1995
The terms used in this standard can be found in GB2900.1, 10, 12, 15, 16, 17, 18, 34, 47. 4
The electrical equipment described in this standard has almost been covered by various electrical equipment standards. The purpose of this standard is to supplement the electrical equipment standards related to the use of gas turbines. The gas turbine electrical equipment covered by this standard is divided into four main parts: a.
Main power supply system:
Auxiliary power supply system;
DC power supply system;
Relay protection.
The main power supply system includes all electrical equipment from the grounding wire of the generator neutral point to the main transformer or busbar, but does not include the main transformer or busbar.
The auxiliary power supply system includes all equipment necessary to provide AC power to the gas turbine generator set and the motor. The DC power supply system only includes batteries and chargers. Relay protection is limited to the relay protection of the main power supply system. 5
Auxiliary power supply system
5.1 Generator
The gas turbine generator (hereinafter referred to as the generator) shall comply with the provisions of GB755, GB/T7064 and JB/T7074. If the user has special requirements for specific products, it can be determined by negotiation between the user and the manufacturer. 5.1.1 Design
According to the purpose, operation mode and on-site environmental conditions, the generator can be cooled by air or hydrogen. Within the specified ambient temperature range, the output power of the generator at a certain power factor should be equal to or greater than the output power of the gas turbine generator set in the basic and peak load operation modes. The noise of the generator shall comply with the provisions of Article 4.7 of JB/T7074. The periodicity of the peak load operation of the generator shall be considered when designing the stator and rotor, so as to minimize the influence of insulation wear and metal fatigue caused by the movement of the winding in the slot and multiple thermal cycles on the performance of the generator. This is different from the basic load operation, which has fewer starts and a long operation time at rated load. The generator shall take appropriate fire extinguishing measures. 5.1.2 Air cooling characteristics
Except for generators suitable for outdoor work, other generators shall be equipped with a wind and rainproof outer compartment. An air intake filter device shall be provided, and a differential pressure gauge shall be configured to determine when maintenance is required. If necessary to meet the voltage noise standard, a silencer shall be installed on the intake and exhaust ducts. A space heater shall be provided for the generator to be used during shutdown. Inlet air may be heated when used under low temperature conditions, and inlet air may be cooled when used under high temperature conditions. Temperature detectors shall be provided to monitor the temperature of the stator winding and cooling air. If necessary, a device to prevent bearing oil from entering the stator and a cooler leakage detection device may be provided. 5.1.3 Hydrogen Cooling Features
The generator casing should be able to withstand the explosion of internal hydrogen and limit the damage to the internally packaged parts. Devices should be installed to monitor and maintain the hydrogen pressure and purity. When the hydrogen pressure and purity exceed the allowable range, it should be purged with CO2. A suitable hydrogen sealing system should be provided to minimize the loss of hydrogen in the generator during operation and shutdown. 2
JB/T7822-1995
The stator winding should be equipped with a temperature detector. In addition, each hydrogen cooler should be equipped with a detector for detecting the temperature of cold air and hot air. A cooler water leakage detection device can be installed when necessary. 5.1.4 Additional test devices
An instrument or device for measuring the vibration of the generator should be installed. An indication or protection device for the bearing temperature or the bearing lubricating oil temperature should be installed. A bearing lubricating oil inlet pressure low protection device should also be installed. 5.2 Excitation system
The excitation system includes an exciter or main field power supply, a field circuit breaker or a device for cutting off the excitation current of the generator, a regulator, a controller, a limiter, etc. These devices provide power for the generator field and control the generator output voltage. The excitation system shall comply with the provisions of GB7409. 5.2.1 Exciter
The exciter can be rotating or static. It must match the excitation requirements of the generator over the entire operating range. Whether the output of the exciter is reversible depends on the requirements of the power system. 5.2.2 Regulator
The excitation system should have two ways to control the output voltage of the generator. One is to use a continuously acting regulator, and the other is to use a manually controlled or auxiliary regulator. Either control method should be suitable for the various starting methods described in Article 3.1.1 of JB/T5884. The regulation accuracy at steady-state load should be equal to or better than ±0.5%, and the drift value in the entire ambient temperature range should not be greater than ±0.75%. For those with special adjustment requirements, the above indicators can be stricter or wider. The generator voltage should be able to be adjusted within the minimum and maximum operating voltage range required by the power system.
In some applications, the generator excitation system does not use the generator voltage as the basic control quantity, but controls the power factor or load power output. At this time, the requirements of all excitation systems except the basic control quantity are still the same as mentioned above. 5.2.3 Limiters, signal conditioners and compensators can be equipped with over-excitation and under-excitation limiting devices for operation and protection purposes. The use of these devices should be coordinated with the operation of the power plant and the functions of other magnetic systems. The limiter can sense the parameters of the generator magnetic field or the power system in order to achieve the following protection functions; generator magnetic field overheating protection;
generator under-excitation heating protection;
c.Power system underexcitation protection.
In order to improve the performance of the power system, signal conditioners can be set to affect the main voltage regulation function of the excitation system. For example, a power system stabilizer or voltage/rate limiter can be set, and other signal conditioners can improve the performance of the entire excitation system in special applications. If the impedance of the generator to the parallel point is less than about 6%, the setting of compensators can usually make the difference in reactive current distributed to each generator within ±5%. For line voltage drop applications, it may be necessary to set compensators, which is better than regulating the voltage at the generator output terminal. In any case, when using compensators, the signal measured by the excitation system regulator is changed by the action of the compensator, allowing the generator terminal voltage to vary beyond the specified range.
5.2.4 System response
Unless the power system requires a higher value or a high initial response system is required, the excitation system voltage response ratio is generally not less than 1. The excitation system peak voltage is generally not less than 1.6 times the rated excitation voltage. 5.2.5 Removal of generator field power supply
The excitation system should be equipped with a device to quickly remove the generator field power supply when the protection is activated. The device can be an AC circuit disconnection device or a DC circuit disconnection device with a discharge resistor or a static component that is controlled to produce the required action. 5.2.6 Maintenance of fault current
The excitation system should have a means to provide fault current to the generator when an external fault occurs to the generator, and its action time should be sufficient to enable the fault protection system (relay protection system) to complete the action. 5.3 Busbar connection line
The busbar connection line of the main power supply system refers to the connection line from the generator outlet to the generator circuit breaker, main transformer or power plant bus. They can be cables or busbars, can be overhead or buried, closed or scattered, but should have the following properties: a. The main busbar and conductor should be able to continuously transmit the maximum load surface temperature rise not exceeding the specified value; b. Special attention should be paid to avoid local overheating at the bolted joints of the busbars, and electroplating or similar treatment methods should be used to ensure the good joint surface;
Insulators and supports should be installed firmly to prevent short circuits on the displacement surface caused by force; c
d. The ends should leave enough space for connecting the busbar chamber, or leave appropriate space for the cable terminals of the main leads of the generator. Flexible connections should be used in places with perturbations, expansions and settlement differences. 5.4 Circuit breakers
This clause gives general requirements for circuit breakers that control the output of gas turbine generator sets. The circuit breaker can be connected to the generator output terminal or to the high-voltage winding side of the generator-transformer unit connection. This standard does not include circuit breakers connected to the buyer's substation or switch station. The parameters, performance, test, insulation structure, operating mechanism, auxiliary and control equipment and structural elements of the circuit breaker shall comply with the provisions of GB1984. If the generator circuit breaker is installed in the switch cabinet, the switch cabinet shall comply with the provisions of GB3906. For gas turbine generator sets whose output power varies with ambient temperature, the continuous current rating of the circuit breaker shall be determined based on the maximum expected output current of the generator at normal ambient temperature and site altitude. The circuit breaker carrying capacity at other ambient temperatures should be equal to or greater than the maximum expected output current of the generator within the specified ambient temperature range. The continuous current rating of the circuit breaker is usually determined by the current carrying capacity at an ambient temperature of 40°C.
The breaking current rating should be specified or the short-circuit characteristics of the system should be provided so that a circuit breaker of appropriate capacity can be selected. The circuit breaker should be suitable for synchronous operation and be able to withstand the voltage at different phases at both ends of the normally open contacts during synchronous operation. 5.4.1 Design
The mechanical and physical properties of the circuit breaker insulation system should be able to withstand the load during circuit breaker operation, including the stress caused by wire connection and ambient temperature changes. The materials used in the insulation system should be non-combustible, non-toxic gas-generating and non-hygroscopic materials. The design of the operating mechanism and related control equipment should comply with the provisions of GB11022. The normal operation of the circuit breaker should be guaranteed when the control voltage is within the range specified in GB11022.
5.5 Surge protection
The surge protection of the generator consists of lightning arresters and capacitors connected between each phase and the power plant grounding grid, and should comply with the provisions of GB11032 or GB7327.
The lightning arrester and capacitor should be installed as close to the generator outlet as possible. When the lightning arrester and capacitor need to be installed separately, the capacitor should be installed closest to the generator
The generator frame (two places), neutral point impedance and the grounding terminal of the surge protection device should be firmly connected to the power station grounding grid. 5.5.1 Generator-transformer unit connection
When the generator is connected to the system through a step-up transformer, it is recommended that the surge protection be installed at the generator outlet. If the generator surge impedance is very low, some unit-connected generators may not need surge protection, but these situations must be carefully analyzed one by one, and it must be confirmed that the performance of the generator and transformer can limit the severe surge wave front to a certain level and will not cause the generator to be damaged during the surge.
Most unit-connected generators are high-impedance grounded. The ratings of the arresters and capacitors shall be determined according to the grounding method used. No surge protection is required for the generator neutral point except for the star-star connected transformer. When a star-star connected transformer is used, the neutral point surge protection shall be provided as if the neutral point is not grounded. 5.5.2 Generator Directly Connected to Overhead Lines
This connection consists of connecting the generator to the overhead line through a resistor, a regulator or a continuous metal connecting wire. When the generator neutral point is not grounded and in most cases is grounded through a reactance, surge protection is required for the generator neutral point. Such protection shall be provided by lightning arresters for power stations or rotating machines, which shall be rated to protect the generator windings under the maximum expected overvoltage and take into account the generator voltage level and grounding method. 5.5.3 Connection of Generator to Medium Voltage Busbar of Power Plant 4
JB/T7822 -1995
With few exceptions, regardless of the connection method (cable or busbar) used from the generator to the busbar, the arrester shall be installed at the generator outlet. Transformers with high series impedance do not require arresters when the generator is subjected to surge strikes. Capacitors should be installed at the generator output terminals to reduce the rate of rise of the surge. 5.6 Neutral point grounding
5.6.1 Considerations
The following main factors should be considered in the grounding method of the generator neutral point: a. Relay protection
The size of the line-to-ground fault is controlled to a certain extent by the generator neutral point grounding device. For generators connected in parallel through the generator voltage bus, low impedance grounding is required, and relay protection is required to be selective. For generators not connected in parallel through the generator voltage bus, the grounding impedance can have a range, which depends on the type of protection required. b. Mechanical stress
In star-connected generators, grounding should meet the limitations on winding stress. e. Transient overvoltage limitation
The neutral point grounding system should be designed to limit transient overvoltages to below the arrester breakdown discharge voltage. d.
Fault point damage limitation
When a ground fault occurs, the fault damage is minimized by limiting the neutral point current. 5.6.2 Type
The neutral point of the generator is grounded through a reactor, resistor or distribution transformer. When selecting a grounding method for a generator, the value of the ground fault current allowed to pass should be considered. High fault currents are usually associated with neutral point reactor grounding, and low fault currents are usually associated with distribution transformer grounding.
5.7 Transformers
Sufficient voltage transformers and current transformers should be configured for relay protection and measuring instruments to facilitate the safe and efficient operation of gas turbine generator sets.
5.7.1 Voltage transformers
The voltage transformer should comply with the provisions of GB1207. The appropriate rated output and accuracy level should be selected according to the application. The insulation level of the transformer should be consistent with the insulation level of the system to which it is connected. In order to prevent excessive primary current from being caused by secondary circuit failure, fuses should be installed in the secondary circuit. When applied to generators, if the voltage error caused by the combined load of the voltage regulator and the instrument is greater than 0.5%, or the change in the secondary voltage of the transformer caused by the load swing of the regulator is greater than 0.5%, it is recommended to use two sets of voltage transformers. Voltage transformers should be installed on each side of the circuit breaker for synchronization. Generator side:
Voltage transformers for measuring instruments, relay protection and synchronization; a.
b. Voltage transformers for generator voltage regulators (if necessary). Grid side:
Voltage transformers for instruments, synchronization and possible relay protection and measurement; a.
In special cases, voltage transformers can be used to reflect bus grounding. b.
The primary circuit of the transformer should be protected by a fuse, and the fuse should have the required breaking capacity. If the load exceeds the capacity of the existing fuse, a current limiting resistor can be used.
If auxiliary measurement is required, a voltage transformer can be added. 5.7.2 Current transformer
Current transformers should comply with the provisions of GB1208. Appropriate rated output and accuracy level should be selected according to the purpose. 5bZxz.net
JB/T7822-1995
The insulation level of the transformer should be consistent with the insulation level of the system to which it is connected. When applied to generators, the following three-phase current transformer groups should be set on the neutral point side of the generator: one group is dedicated to the generator differential protection, but can be shared with the generator transformer group differential protection. One group is for the main transformer differential protection. This group of current transformers should be arranged at a position where all current transformers of the generator can be included in the scope of this protection. The current transformers on the grid side of this protection should also be arranged at a position where all current transformers on the grid side can be included in the scope of this protection. This protection provides backup differential protection for the generator. If the location allows, a third group of current transformers should be set up for measuring instruments and relay protection other than differential protection. If the location allows a fourth group of current transformers, the relay protection and measuring instruments should be connected separately. The following current transformer groups should be set up on the generator outlet side (installed on the generator bushing - such as this configuration or installed in the switch cabinet): one group for generator differential protection.
One or more groups for generator voltage regulator. If the third and fourth groups of current transformers cannot be provided on the generator neutral point side for measuring instruments and maintenance protection, the current transformers for these purposes can be installed on the generator outlet side.
Current transformers that can provide the required accuracy, rated output, conversion ratio and voltage level for the following purposes: generator differential protection auxiliary busbar branches; a.
generator auxiliary busbar overload;
Star-connected auxiliary transformers and transformer neutral points for large motors; auxiliary transformers and transformer overload for large motors; auxiliary system measurement.
5.8 Disconnectors and load switches
This clause includes general requirements for high-voltage disconnectors and load switches for gas turbine generator sets. Disconnectors are used to isolate generator circuit breakers, and load switches are used to cut off auxiliary feeders. The ratings, working conditions, definitions, tests, manufacturing specifications and uses of disconnectors and load switches shall comply with the provisions of GB1985 and GB3804.
5.8.1 Rated values
The rated values of circuit breaker disconnectors shall be determined based on the maximum voltage, continuous current and instantaneous current requirements of the system and the circuit breaker. The rating of the auxiliary feeder load switch should be determined according to the system voltage, maximum instantaneous current and the requirements of the auxiliary feeder, that is, the rating of the auxiliary transformer.
The isolating switch and the load switch should be able to operate at the specified rating within the normal ambient temperature range and the site altitude. The temperature rise of each part of the isolating switch and the load switch and the continuous current outside the specified ambient temperature range should comply with the provisions of GB763. 5.8.2 Design
When the generator circuit breaker can be completely removed from the switch cabinet, the isolating switch can be installed. Necessary interlocking devices should be set to prevent the circuit breaker from operating the isolating switch when it is in the closed state. The operating mechanism of the isolating switch and the load switch should be designed to not require too much force, such as extending the handle or adding additional operators, so that the switch can be completely closed and locked or fully opened. Power operating mechanisms (motor drive, hydraulic drive, pneumatic) should not be used except in special occasions where remote control is required. If used, necessary limit switches, position indicators, interlocking devices and manual operating devices should be included. 6 Auxiliary power supply system
6.1 Transformer
6.1.1 The transformer that provides power for gas turbine auxiliary equipment can be selected into oil-immersed transformer and dry-type transformer according to the characteristics of the transformer installation site. Its technical requirements shall comply with GB1094.1～1094.5. Dry-type transformers shall comply with GB6450, and oil-immersed transformers shall comply with GB6451.16451.2.
JB/T7822-1995
6.1.2 The rated capacity (kVA) and rated voltage of the transformer shall be determined according to the power and voltage level of the electrical equipment powered by the transformer, and the voltage drop generated by the transformer when the motor is started shall be considered. 6.1.3 When the oil-immersed transformer is installed indoors, the transformer room shall be designed according to the requirements of 3.1 and 3.2 in the GBJ16 fire protection specification. Oil-immersed transformers shall be equipped with the following accessories:6.1.4
Tap-changer for off-excitation voltage regulation;
Oil temperature indicator;
Oil level indicator;
Oil drain device;
Nameplate;
Earthing plate;
Facilities for lifting, moving and jacking.
To meet special requirements, the following accessories may also be added: a.
Temperature relay;
Pressure relief device;
Gas (gas) relay;
External cooling fan and controller installed to increase capacity; Bushing type lightning arrester installed on high voltage side.
Transformers supplying gas turbine starter motors shall be specially considered, and their rated capacity (KVA) and rated voltage shall be determined according to the expected6.1.5
operation mode and power system characteristics. The gas turbine manufacturer should make recommendations because during the starting process, the motor usually operates at a condition exceeding its continuous duty rating. 6.2 Low-voltage switchgear
6.2.1 The low-voltage switchgear supplied with the gas turbine generator set usually provides protection and control for the relevant motors, heaters and other electrical equipment with a voltage of 600V and below. Its technical conditions should comply with the requirements of GB7251. 6.2.2 Low-voltage switchgear should use low-voltage withdrawable switchgear, and its technical conditions should comply with the requirements of ZBK36001. 6.2.3 Electrical equipment with a voltage of 150V or above in the low-voltage switchgear is 600V class, and electrical equipment with a voltage of 150V and below is 300V class.
6.2.4 Low-voltage switchgear should be able to withstand three-phase short-circuit current without causing thermal or mechanical damage. Circuit breakers and fuses should have sufficient breaking capacity to ensure safe disconnection in the event of a fault. 6.2.5 Each functional unit of low-voltage withdrawable switchgear shall be equipped with a reliable mechanical interlocking device. The functional unit can only be withdrawn or inserted when the main switch or circuit breaker is in the disconnected position. 6.2.6 Each functional unit of low-voltage withdrawable switchgear shall be reliably grounded. 6.2.7 Low-voltage switchgear shall be equipped with mesh plates and partitions to prevent small animals from entering and causing electrical equipment failures. 6.2.8 Low-voltage switchgear shall be equipped with single-phase operation protection devices. 6.3 Switch setting
6.3.1 The switchgear consists of a circuit breaker, busbar and accessories mounted on a metal frame, and is completely enclosed in a metal sheet shell together with other electrical equipment. Its technical requirements shall comply with GB3906. 6.3.2 The switchgear is used for electrical equipment above 600V, and can also be used to place generator circuit breakers and accessories. 6.3.3 The switchgear shall be suitable for the operation of gas turbines in abnormal environments, automatic operation and abnormal operation. 6.3.4 The load-bearing parts, insulators, brackets and casing of the main circuit shall have sufficient strength to withstand the instantaneous impact current and the maximum effective value of the full current caused by three-phase short circuit, two-phase short circuit and single-phase short circuit without damage. 6.3.5 The switchgear shall be able to install protective relays, instrument measurement transformers, surge protection devices, neutral point grounding and other equipment related to busbar and feeder circuits.
6.3.6 Sufficient space shall be left for lead wires, and special attention shall be paid in the case of cable connection. 7
6.4 Grounding
JB/T7822 -1995
6.4.1 The non-energized metal parts of the gas turbine shall be well connected and grounded in strict accordance with the requirements of GBJ65 to ensure that there is no risk of electric shock to the on-site personnel.
6.4.2 The grounding wire shall be able to withstand the maximum grounding fault current without causing fire or explosion accidents. 6.4.3 The metal sheath of the cable and the steel pipe for the conductor can be used as the grounding wire, but if the grounding resistance is not low enough to withstand the expected maximum ground fault current, a separate grounding wire should be installed in the cable and the steel pipe, which will conduct the ground fault current together with the metal sheath of the cable and the steel pipe.
6.4.4 The grounding grid of the gas turbine should maintain a sufficiently low grounding resistance so that no voltage that endangers personal safety is generated when the maximum ground fault current is withstand.
6.4.5 There should be multiple connections between the gas turbine and the grounding grid. When one of them is damaged, it will not cause a dangerous situation. 6.5 Motors
6.5.1 The motors used in conjunction with the gas turbine should meet the technical requirements in GB755. 6.5.2 The motor nameplate rating shall meet the load requirements of the driven equipment at the maximum operating condition. The motor shall have sufficient working capacity and does not need to be replaced during the life of the gas turbine.
6.5.3 The starting motor is allowed to operate at a higher than the nameplate rating for a short period of time. 6.5.4 For motors used outdoors, the windings shall be able to withstand the invasion of heat, moisture, oil and possible chemicals in the surrounding atmosphere. The insulation layer of the windings shall be impregnated, and a motor winding heater may be added if necessary. 6.5.5 The structure of the motor shaft and bearing seat shall prevent the lubricating oil from leaking along the shaft or dripping into the windings. 6.5.6 There shall be sufficient access channels and space distances around the motor for normal maintenance. 6.6 Wiring
6.6.1 The wiring of the gas turbine includes the connection wires between the control panel, protection panel, low-voltage complete switchgear and dispersed installed equipment. The internal wiring of the equipment is not included in the scope of this standard. 6.6.2 Copper core wires should be used for conductors. For conductors in high temperature areas or near high temperature parts of gas turbines, high temperature resistant flame retardant cables or wires should be used.
6.6.3 Conductors or conduits should be installed in vibration-free areas. 6.6.4 The cross-section of the control system conductor should not be less than 1.5mm, the cross-section of the transformer secondary circuit conductor should not be less than 2.5mm, and the rated voltage should not be less than 600V.
6.6.5 The wiring of measuring devices such as thermocouples, thermal resistors, sensors and alternating current transmitters should be suitable for their use requirements. 6.6.6 Cables and wires can be laid in steel pipes, hoses and wiring troughs. Cables can also be laid in cable trenches. 6.6.7 Terminal blocks and connectors for multi-core cables can be used for connections between electrical equipment. Connectors should not loosen under expected vibration conditions and be easy to install. Their rated voltage and rated current should be compatible with the electrical equipment. A certain number of terminal blocks should be reserved for spare use. 6.6.8 The connecting wires between the terminals (connectors) should not have joints and should be laid according to the voltage level to reduce electrical interference and danger. Shielded or twisted-pair wires should be used where necessary. 7 DC power supply system
7.1 Battery
7.1.1 The battery pack used with the gas turbine should meet the technical requirements of GB5008.1, GB9368 and GB9369. 7.1.2 The battery pack should be connected to an adjustable constant voltage charger. The load of the battery pack should include control circuits, emergency lighting, emergency auxiliary equipment and other necessary loads. 7.1.3 The battery pack should have sufficient capacity so that when the battery charger does not work or the AC auxiliary power supply cannot be used, the battery pack can still ensure that all DC auxiliary equipment required for safe shutdown is put into operation. After the specified number of unsuccessful starts, the battery pack should be able to provide sufficient capacity for safe shutdown.
7.1.4 The capacity of the battery pack should be determined by considering the size, sequence and duration of the load, as well as the factors causing the capacity to decrease due to changes in operating temperature. When the capacity of the battery pack is less than 80% of the rated value and measures cannot be taken to increase its capacity, it should be replaced. 7.1.5 The selection of batteries should be based on good performance and long service life. Cadmium nickel alkaline batteries are generally selected. 7.1.6 The battery pack should be able to work under the floating charge system and be charged evenly. The output voltage should meet the use requirements. 7.1.7 The battery pack provided for on-site use should be charged and discharged for the first time. 7.1.8 Radium nickel alkaline battery packs can be installed in the machine control room or other control rooms. Lead-acid battery packs should be installed in the battery room. Drop batteries should be placed on a special frame or base. 7.2 Battery Charger
7.2.1 The charger should be able to keep the connected battery pack in a charged state and supply power to the DC load. 7.2.2 The charger should be able to provide charging current for the discharged battery pack so that the battery can be restored to a fully charged state within the specified time. 7.2.3 The charger should be able to supply power to the DC load within its rated value range without connecting the battery. 7.2. 4
The floating charge and equalization charge voltages of the charger should meet the technical requirements of the battery. 7.2.5 When the input voltage and output current of the charger vary within the allowable range, the battery voltage should be kept stable. The floating charge and equalizing charge voltages shall be continuously (steplessly) adjustable and at least adjustable to the rated value ± 4%. 7.2.61
The charger shall be designed to be in a non-grounded state and equipped with insulation monitoring and sound and light alarms. 7.2.73
The charger shall have an automatic current limiting control (constant current) function and be able to carry continuously within the specified current limit value without damage. 7.2.83
When the charger is connected to the battery pack, the output ripple and voltage spike value shall be limited as needed to minimize the electrical noise level that may cause equipment malfunction or 7.2.93
damage. 7.2.10 Charger The motor should be equipped with an AC input circuit breaker, a DC output circuit breaker, and a DC output current and voltage meter. 8 Relay protection
8.1 The relay protection system described in this article is only applicable to the main power supply system. For the protection of gas turbines, see JB/T5884. 8.2 The electrical protection relays of the gas turbine generator set can choose electromagnetic, rectifier, and static relays, and their technical requirements should comply with GB10231, GB6162, and GB4858.
8.3 The relay protection system should be able to automatically trip or alarm when a fault occurs in the main power supply system. The following protections are generally set:
Generator differential protection;||tt| |Generator overcurrent protection;
Generator stator grounding protection;
Generator negative sequence overcurrent protection;
Generator reverse power protection;
Generator demagnetization protection;
Generator undervoltage protection,
Generator excitation circuit grounding protection;
Generator overvoltage protection.
8.4 Under special circumstances, even if the gas turbine generator set is not provided with a main transformer, a main transformer relay protection device can be installed. 8.5 In order to avoid the gas turbine restarting and the generator re-excitation without eliminating the fault, a manually reset lockout relay should be installed . The relay should be able to trip when a fault occurs and not allow the gas turbine to start. 8.6 Generators and transformers should be equipped with backup protection. For certain equipment failures that may cause damage to the operating units, backup protection should also be considered.
8.7 The current circuit, voltage circuit, and trip circuit of the relay should be equipped with isolation and test switches and test sockets. 8.8 The secondary circuit of the current transformer is not allowed to be open when energized. When disconnection is required, the secondary circuit should be short-circuited through a test switch or test socket
8.9 The relay should be equipped with an action indicator or provide an alarm contact. 9
JB/T 7822 -1995
Each locking relay coil circuit should be equipped with a monitoring device, additional instructions:
to ensure correct operation.
This standard is proposed and managed by the Nanjing Gas Turbine Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Nanjing Gas Turbine Research Institute and Nanjing Steam Turbine and Electric Motor Factory, and Shanghai Steam Turbine Factory and Shanghai Power Equipment Complete Design Institute participated in the drafting.
The main drafters of this standard are: Zhu Jianye, Ye Ping, Tu Qingguo, He Renchao, and Yang Daogang. 107 Terminal blocks and connectors for multi-core cables can be used for connection between electrical equipment. Connectors should not loosen under expected vibration conditions and should be easy to install. Their rated voltage and rated current should be compatible with the electrical equipment. A certain number of terminals should be reserved for spare use. 6.6.8 The connecting wires between the terminals (connectors) should not have joints and should be laid according to voltage levels to reduce electrical interference and danger. Shielded or twisted-pair wires should be used where necessary. 7 DC power supply system
7.1 Battery
7.1.1 The battery pack used in conjunction with the gas turbine should comply with the technical requirements of GB5008.1, GB9368, and GB9369. 7.1.2 The battery pack should be connected to an adjustable constant voltage charger. The load of the battery pack should include control circuits, emergency lighting, emergency auxiliary equipment, and other necessary loads. 7.1.3 The battery pack should have sufficient capacity so that when the battery charger does not work or the AC auxiliary power supply cannot be used, the battery pack can still ensure that all DC auxiliary equipment required for safe shutdown is put into operation. After the specified number of unsuccessful starts, the battery pack should be able to provide sufficient capacity for safe shutdown.
7.1.4 The capacity of the battery pack should be determined taking into account the size, sequence and duration of the load carried, as well as the factors causing capacity reduction due to changes in operating temperature. When the capacity of the battery pack is less than 80% of the rated value and measures cannot be taken to increase its capacity, it should be replaced. 7.1.5 The selection of batteries should be based on good performance and long service life. Cadmium nickel alkaline batteries are generally selected. 7.1.6 The battery pack should be able to work under the floating charge system and be charged evenly. The output voltage should meet the use requirements. 7.1.7 The battery pack provided for on-site use should be charged and discharged for the first time. 7.1.8 Radium nickel alkaline battery packs can be installed in the machine-side control room or other control rooms. Lead-acid battery packs should be installed in the battery room. The battery should be placed on a special frame or base. 7.2 Battery charger
7.2.1 The charger should be able to keep the connected battery pack in a charged state and supply power to the DC load. 7.2.2 The charger should be able to provide charging current for the discharged battery pack so that the battery can be restored to a full state within the specified time. 7.2.3 The charger should be able to supply power to the DC load within its rated value range without connecting the battery. 7.2. 4
The floating charge and equalization charge voltages of the charger should meet the technical requirements of the battery. 7.2.5 When the input voltage and output current of the charger vary within the allowable range, the battery voltage should be kept stable. The floating charge and equalizing charge voltages shall be continuously (steplessly) adjustable and at least adjustable to the rated value ± 4%. 7.2.61
The charger shall be designed to be non-grounded and equipped with insulation monitoring and sound and light alarms. 7.2.73
The charger shall have an automatic current limit control (constant current) function and be able to carry continuously within the specified current limit without damage. 7.2.83
When the charger is connected to the battery pack, the output ripple and voltage spike value shall be limited as needed to minimize the electrical noise level that may cause equipment malfunction or 7.2.93
damage. 7.2.10 Charger The motor should be equipped with an AC input circuit breaker, a DC output circuit breaker, and a DC output current and voltage meter. 8 Relay protection
8.1 The relay protection system described in this article is only applicable to the main power supply system. For the protection of gas turbines, see JB/T5884. 8.2 The electrical protection relays of the gas turbine generator set can be electromagnetic, rectifier, or static relays, and their technical requirements should comply with GB10231, GB6162, and GB4858.
8.3 The relay protection system should be able to automatically trip or alarm when a fault occurs in the main power supply system. The following protections are generally set:
Generator differential protection;||tt| |Generator overcurrent protection;
Generator stator grounding protection;
Generator negative sequence overcurrent protection;
Generator reverse power protection;
Generator demagnetization protection;
Generator undervoltage protection,
Generator excitation circuit grounding protection;
Generator overvoltage protection.
8.4 Under special circumstances, even if the gas turbine generator set is not provided with a main transformer, a main transformer relay protection device can be installed. 8.5 In order to avoid the gas turbine restarting and the generator re-excitation without eliminating the fault, a manually reset lockout relay should be installed . The relay should be able to trip when a fault occurs and not allow the gas turbine to start. 8.6 Generators and transformers should be equipped with backup protection. For certain equipment failures that may cause damage to the operating units, backup protection should also be considered.
8.7 The current circuit, voltage circuit, and trip circuit of the relay should be equipped with isolation and test switches and test sockets. 8.8 The secondary circuit of the current transformer is not allowed to be open when energized. When disconnection is required, the secondary circuit should be short-circuited through a test switch or test socket
8.9 The relay should be equipped with an action indicator or provide an alarm contact. 9
JB/T 7822 -1995
Each locking relay coil circuit should be equipped with a monitoring device, additional instructions:
to ensure correct operation.
This standard is proposed and managed by the Nanjing Gas Turbine Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Nanjing Gas Turbine Research Institute and Nanjing Steam Turbine and Electric Motor Factory, and Shanghai Steam Turbine Factory and Shanghai Power Equipment Complete Design Institute participated in the drafting.
The main drafters of this standard are: Zhu Jianye, Ye Ping, Tu Qingguo, He Renchao, and Yang Daogang. 107 Terminal blocks and connectors for multi-core cables can be used for connection between electrical equipment. Connectors should not loosen under expected vibration conditions and should be easy to install. Their rated voltage and rated current should be compatible with the electrical equipment. A certain number of terminals should be reserved for spare use. 6.6.8 The connecting wires between the terminals (connectors) should not have joints and should be laid according to voltage levels to reduce electrical interference and danger. Shielded or twisted-pair wires should be used where necessary. 7 DC power supply system
7.1 Battery
7.1.1 The battery pack used in conjunction with the gas turbine should comply with the technical requirements of GB5008.1, GB9368, and GB9369. 7.1.2 The battery pack should be connected to an adjustable constant voltage charger. The load of the battery pack should include control circuits, emergency lighting, emergency auxiliary equipment, and other necessary loads. 7.1.3 The battery pack should have sufficient capacity so that when the battery charger does not work or the AC auxiliary power supply cannot be used, the battery pack can still ensure that all DC auxiliary equipment required for safe shutdown is put into operation. After the specified number of unsuccessful starts, the battery pack should be able to provide sufficient capacity for safe shutdown.
7.1.4 The capacity of the battery pack should be determined taking into account the size, sequence and duration of the load carried, as well as the factors causing capacity reduction due to changes in operating temperature. When the capacity of the battery pack is less than 80% of the rated value and measures cannot be taken to increase its capacity, it should be replaced. 7.1.5 The selection of batteries should be based on good performance and long service life. Cadmium nickel alkaline batteries are generally selected. 7.1.6 The battery pack should be able to work under the floating charge system and be charged evenly. The output voltage should meet the use requirements. 7.1.7 The battery pack provided for on-site use should be charged and discharged for the first time. 7.1.8 Radium nickel alkaline battery packs can be installed in the machine-side control room or other control rooms. Lead-acid battery packs should be installed in the battery room. The battery should be placed on a special frame or base. 7.2 Battery charger
7.2.1 The charger should be able to keep the connected battery pack in a charged state and supply power to the DC load. 7.2.2 The charger should be able to provide charging current for the discharged battery pack so that the battery can be restored to a full state within the specified time. 7.2.3 The charger should be able to supply power to the DC load within its rated value range without connecting the battery. 7.2. 4
The floating charge and equalization charge voltages of the charger should meet the technical requirements of the battery. 7.2.5 When the input voltage and output current of the charger vary within the allowable range, the battery voltage should be kept stable. The floating charge and equalizing charge voltages shall be continuously (steplessly) adjustable and at least adjustable to the rated value ± 4%. 7.2.61
The charger shall be designed to be non-grounded and equipped with insulation monitoring and sound and light alarms. 7.2.73
The charger shall have an automatic current limit control (constant current) function and be able to carry continuously within the specified current limit without damage. 7.2.83
When the charger is connected to the battery pack, the output ripple and voltage spike value shall be limited as needed to minimize the electrical noise level that may cause equipment malfunction or 7.2.93
damage. 7.2.10 Charger The motor should be equipped with an AC input circuit breaker, a DC output circuit breaker, and a DC output current and voltage meter. 8 Relay protection
8.1 The relay protection system described in this article is only applicable to the main power supply system. For the protection of gas turbines, see JB/T5884. 8.2 The electrical protection relays of the gas turbine generator set can be electromagnetic, rectifier, or static relays, and their technical requirements should comply with GB10231, GB6162, and GB4858.
8.3 The relay protection system should be able to automatically trip or alarm when a fault occurs in the main power supply system. The following protections are generally set:
Generator differential protection;||tt| |Generator overcurrent protection;
Generator stator grounding protection;
Generator negative sequence overcurrent protection;
Generator reverse power protection;
Generator demagnetization protection;
Generator undervoltage protection,
Generator excitation circuit grounding protection;
Generator overvoltage protection.
8.4 Under special circumstances, even if the gas turbine generator set is not provided with a main transformer, a main transformer relay protection device can be installed. 8.5 In order to avoid the gas turbine restarting and the generator re-excitation without eliminating the fault, a manually reset lockout relay should be installed . The relay should be able to trip when a fault occurs and not allow the gas turbine to start. 8.6 Generators and transformers should be equipped with backup protection. For certain equipment failures that may cause damage to the operating units, backup protection should also be considered.
8.7 The current circuit, voltage circuit, and trip circuit of the relay should be equipped with isolation and test switches and test sockets. 8.8 The secondary circuit of the current transformer is not allowed to be open when energized. When disconnection is required, the secondary circuit should be short-circuited through a test switch or test socket
8.9 The relay should be equipped with an action indicator or provide an alarm contact. 9
JB/T 7822 -1995
Each locking relay coil circuit should be equipped with a monitoring device, additional instructions:
to ensure correct operation.
This standard is proposed and managed by the Nanjing Gas Turbine Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Nanjing Gas Turbine Research Institute and Nanjing Steam Turbine and Electric Motor Factory, and Shanghai Steam Turbine Factory and Shanghai Power Equipment Complete Design Institute participated in the drafting.
The main drafters of this standard are: Zhu Jianye, Ye Ping, Tu Qingguo, He Renchao, and Yang Daogang. 1010 The charger shall be equipped with AC input circuit breaker, DC output circuit breaker and DC output current and voltage meter. 8 Relay protection
8.1 The relay protection system described in this article is only applicable to the main power supply system. For the protection of gas turbines, see JB/T5884. 8.2 The electrical protection relays of gas turbine generator sets can be electromagnetic, rectifier and static relays, and their technical requirements shall comply with GB10231, GB6162 and GB4858.
8.3 The relay protection system shall be able to automatically trip or alarm when a fault occurs in the main power supply system. The following protections are generally set:
generator differential protection;
generator overcurrent protection;
generator stator grounding protection;
generator negative sequence overcurrent protection;
generator reverse power protection;
generator demagnetization protection;
generator undervoltage protection,
generator excitation circuit grounding protection;
generator overvoltage protection.
8.4 In special cases, even if the gas turbine generator set is not provided with a main transformer, a main transformer relay protection device can be set. 8.5 In order to avoid the gas turbine restarting and the generator re-excitation without eliminating the fault, a manually reset locking relay should be installed. The relay should be able to trip when a fault occurs and not allow the gas turbine to start. 8.6 Generators and transformers should be equipped with backup protection. For certain equipment failures that may cause damage to the running units, backup protection should also be considered.
8.7 The current circuit, voltage circuit and trip circuit of the relay shall be equipped with isolation and test switches and test sockets. 8.8 The secondary circuit of the current transformer is not allowed to be open when it is energized. When disconnection is required, the secondary circuit should be short-circuited through a test switch or test socket.
8.9 The relay shall be equipped with an action indicator or an alarm contact. 9
JB/T 7822 -1995
Each locking relay coil circuit shall be equipped with a monitoring device, additional instructions:
to ensure correct operation.
This standard was proposed and coordinated by the Nanjing Gas Turbine Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Nanjing Gas Turbine Research Institute and Nanjing Steam Turbine and Electric Motor Factory, and Shanghai Steam Turbine Factory and Shanghai Power Generation Equipment Complete Design Institute participated in the drafting.
The main drafters of this standard are: Zhu Jianye, Ye Ping, Tu Qingguo, He Renchao, and Yang Daogang. 1010 The charger shall be equipped with AC input circuit breaker, DC output circuit breaker and DC output current and voltage meter. 8 Relay protection
8.1 The relay protection system described in this article is only applicable to the main power supply system. For the protection of gas turbines, see JB/T5884. 8.2 The electrical protection relays of gas turbine generator sets can be electromagnetic, rectifier and static relays, and their technical requirements shall comply with GB10231, GB6162 and GB4858.
8.3 The relay protection system shall be able to automatically trip or alarm when a fault occurs in the main power supply system. The following protections are generally set:
generator differential protection;
generator overcurrent protection;
generator stator grounding protection;
generator negative sequence overcurrent protection;
generator reverse power protection;
generator demagnetization protection;
generator undervoltage protection,
generator excitation circuit grounding protection;
generator overvoltage protection.
8.4 In special cases, even if the gas turbine generator set is not provided with a main transformer, a main transformer relay protection device can be set. 8.5 In order to avoid the gas turbine restarting and the generator re-excitation without eliminating the fault, a manually reset locking relay should be installed. The relay should be able to trip when a fault occurs and not allow the gas turbine to start. 8.6 Generators and transformers should be equipped with backup protection. For certain equipment failures that may cause damage to the running units, backup protection should also be considered.
8.7 The current circuit, voltage circuit and trip circuit of the relay shall be equipped with isolation and test switches and test sockets. 8.8 The secondary circuit of the current transformer is not allowed to be open when it is energized. When disconnection is required, the secondary circuit should be short-circuited through a test switch or test socket.
8.9 The relay shall be equipped with an action indicator or an alarm contact. 9
JB/T 7822 -1995
Each locking relay coil circuit shall be equipped with a monitoring device, additional instructions:
to ensure correct operation.
This standard was proposed and coordinated by the Nanjing Gas Turbine Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Nanjing Gas Turbine Research Institute and Nanjing Steam Turbine and Electric Motor Factory, and Shanghai Steam Turbine Factory and Shanghai Power Generation Equipment Complete Design Institute participated in the drafting.
The main drafters of this standard are: Zhu Jianye, Ye Ping, Tu Qingguo, He Renchao, and Yang Daogang. 10
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