GBT 50062-2008 电力装置的继电保护和自动装置设计规范 英文版

UDC 27 100 K 54 Record No J926 2009 National Standard of the People s Republic of China P GB T 50062 2008 Code for Design of Relaying Protection and Automatic Device of Electric Power Installations Issue Date December 15 2008 ImpIementation Date June 1 2009 Jointly Issued by Ministry of Housing and Urban Rural Development of the People s Republic of China General Administration of Quality Supervision Inspection and Quarantine of the People s Republic of China National Standard of the People s Republic of China P GB T 50062 2008 Code for Design of Relaying Protection and Automatic Device of Electric Power Installations Prepared by China Electricity Council CEC Approved by Ministry of Housing and Urban Rural Development of the People s Republic of China Implemented on June 1 2009 Translation sponsored by China Electric Power Planning 2 Protections for transformers grounded via a resistor and grounding transfomers are supplemented 3 Protections for shunt reactors are supplemented 4 Automatic low frequency load shedding device is changed GB T 50062 2008 II into automatic low frequency and low voltage load shedding device 5 Contents about synchronization closing and disconnection from the grid are curtailed into synchronization closing and the contents about disconnection from the grid are deleted 6 Automatic excitation regulation and de excitation are supplemented 7 Secondary circuits and the associated equipment are supplemented This code is administered by the Ministry of Housing and Urban Rural Development of the People s Republic of China and the Northeast Electric Power Design Institute of China Power Engineering Consulting Group is responsible for the interpretation of specific technical details During the implementation of this code the interests concerned are expected to seriously summarize the experiences and refer any comments and suggestions for modification or supplementation to the Northeast Electric Power Design Institute of China Power Engineering Consulting Group at the address Renmin Street No 4368 Changchun City Jilin Province Postcode 130021 for reference in the future revision Main drafting organization and drafters of this code are as follows The code is drafted by the Northeast Electric Power Design Institute of China Power Engineering Consulting Group The leading authors of this code Li Yanshan Wang Ying Zhang Fusheng Liu Gang An Liqun Fu Guang and Wei Xian an GB T 50062 2008 III Contents 1 General 1 2 General Provisions 2 3 Generator Protection 4 4 Power Transformer Protection 11 5 3kV 66kV Power Line Protection 19 6 110kV Power Line Protection 24 7 Busbar Protection 26 8 Power Capacitor and Reactor Protection 28 8 1 Power Capacitor Protection 28 8 2 Shunt Reactor Protection 30 9 Protection of Motors of 3kV and Above 32 10 Automatic Reclosing 36 11 Automatic Switch in Devices for Standby Power Supplies and Equipment 39 12 Automatic Low Frequency and Low Voltage Load Shedding Device 41 13 Synchronization Closing 42 14 Automatic Excitation Regulation and De excitation 43 14 1 Automatic Excitation Regulation 43 14 2 Automatic De excitation 44 15 Secondary Circuits and Associated Equipment 46 15 1 Secondary Circuits 46 15 2 Current Transformers and Potential Transformers 47 15 3 DC Power Supply 50 15 4 Anti interference Measures 51 GB T 50062 2008 IV Appendix A Permissible Impulse Current Factors of Synchronous Motors and Transformers upon Self synchronized and Non synchronized Closing 53 Appendix B Minimum Sensitivity Coefficients of Relaying Protections 55 Explanation of Wording in This Code 58 GB T 50062 2008 1 1 General 1 0 1 This code is prepared to implement national technical and economic policies in designing relaying protection and automatic device of electric power installations so as to provide safe reliable technically advanced and cost effective designs 1 0 2 This code is applicable to design of relaying protection and automatic device of electric power installations such as 3kV 110kV power lines and equipment generators rated 50MW and below and power transformers rated 63MVA and below 1 0 3 Apart from this code the design of relaying protection and automatic device of electric power installations shall meet the current applicable national standards and codes as well GB T 50062 2008 2 2 General Provisions 2 0 1 Power equipment and lines shall be provided with relaying protection and automatic devices to respond to short circuit faults and abnormal operations These relaying protection and automatic devices shall be able to timely indicate faults and abnormal operations of equipment and lines and clear faults and restore power supply as quickly as possible 2 0 2 Power equipment and lines shall be provided with main protection backup protection and abnormal operation protection and if necessary the auxiliary protection 2 0 3 Relaying protection and automatic device shall meet the requirements for reliability selectivity sensitivity and rapidity and shall comply with the following requirements 1 Relaying protection and automatic device shall have such functions as automatic on line detection blocking and device abnormity fault alarm 2 If it is required that relaying protection and automatic devices coordinate with adjacent equipment and lines the sensitivity coefficient and operation time of adjacent levels shall coordinate with each other 3 If faults occur to protected equipment and lines within the reach of protection necessary sensitivity coefficient shall be provided 4 Protections shall be capable of clearing short circuit faults as quickly as possible If it is required to accelerate the clearing of short circuit faults protections may be allowed to operate GB T 50062 2008 3 unselectively but automatic reclosing devices or automatic switch in devices for standby power sources and equipment shall be used to minimize the outage area 2 0 4 The sensitivity coefficient of protections shall be calculated based on unfavorable normal operation modes and unfavorable fault types When necessary impacts of short circuit current attenuation shall be taken into account The minimum sensitivity coefficient of various relaying protection shall be in accordance with Appendix B to this code GB T 50062 2008 4 3 Generator Protection 3 0 1 For generators with a voltage of 3kV and above and capacity of 50MW and below appropriate protections shall be provided to deal with the following faults and abnormal operations 1 Short circuit between phases of stator windings 2 Grounding of stator windings 3 Inter turn short circuit of stator windings 4 External short circuit of generators 5 Overload of stator windings 6 Overvoltage of stator windings 7 Overload negative sequence of rotor surface layer 8 Grounding of excitation circuits 9 Abnormal drop or loss of excitation current 10 Reverse power 3 0 2 The operation output by protections may include 1 Shutdown to disconnect generator or generator transformer unit circuit breakers and de excite shut off main valves of steam turbine generators or guide vanes of water turbine generators 2 Disconnection and de excitation to disconnect generator or generator transformer unit circuit breakers and de excite and shed loads of steam water turbines 3 Disconnection to disconnect generator or generator transformer unit circuit breakers 4 Minimization of the area affected by faults 5 Signal to give out audio and video signals 3 0 3 Appropriate protections serving as the main protections of GB T 50062 2008 5 generators shall be provided to prevent single phase to phase short circuit faults of stator windings and leads These protections shall operate to cause shutdown while complying with the following requirements 1 For 1MW and below generators operating independently current protection shall be provided at the neutral point side if leads are led out therefrom if no leads are available at the neutral point side low voltage protection shall be provided at the generator terminals 2 For 1MW and below generators that operate in parallel with other generators or power systems instantaneous current protection shall be provided at the generator terminals Where the sensitivity of instantaneous current protection is not up to the requirements longitudinal differential protection may be provided for generators without leads at the neutral point side low voltage blocking overcurrent protection may be provided 3 Generators rated above 1MW shall be provided with longitudinal differential protection For generator transformer units with circuit breaker installed between the generator and the transformer longitudinal differential protection shall be respectively provided for the generator and the transformer if no circuit breaker is installed between the generator and the transformer common longitudinal differential protection may be used for generator transformer units 3 0 4 Grounding protections for generator stators shall comply with the following requirements 1 The allowable single phase to earth fault current of generator stator windings shall be as specified by manufacturers If no manufacturer specifications are available Table 3 0 4 may be followed GB T 50062 2008 6 Table 3 0 4 Allowable Single Phase to earth Fault Current of Generator Stator Windings Rated Voltage of Generator kV Rated Capacity of Generator MW Allowable Grounding Current A 6 3 50 4 10 5 Steam turbine generator 50 3 Water turbine generator 10 50 13 8 Water turbine generator 40 50 2 Note For hydrogen cooled generators rated 13 8kV the allowable single phase to earth fault current of stator windings shall be 2 5A 2 For generators directly connected to busbars if the single phase to earth fault current not allowing for the compensation of arc suppression coil of stator windings is greater than the allowable value selective grounding protections shall be provided which shall operate to cause signaling However when the arc suppression coil is removed out of service or the fault current is greater than the allowable value due to other reasons the protections shall operate to cause shutdown The protections shall be connected to the zero sequence current transformers at the generator terminals Their settings shall be configured to be higher than the unbalanced current and the generator steady state capacitive current resulted from external single phase to earth fault and external short circuit blocking functions should be provided If there is no grounding protection grounding monitoring GB T 50062 2008 7 devices shall be installed on the generator voltage busbars which shall operate to cause signaling The protections or grounding monitoring devices shall be capable of monitoring zero sequence voltage of generators 3 Generator transformer units shall be equipped with stator grounding protections with a protected area not less than 90 The protections shall operate to cause signaling with a time delay and may operate to cause shutdown depending on the system conditions and generator insulation as well The protections shall be capable of monitoring zero sequence voltage of generators 3 0 5 The inter turn short circuit protection of generator stators shall comply with the following requirements 1 For generators that employ star connection mode for stator windings have parallel branches per phase and have outlet terminals of branches at the neutral point zero sequence current transverse differential protection or split phase transverse differential protection shall be equipped The transverse differential protection or split phase transverse differential protection shall instantaneously operate to cause shutdown Upon occurrence of one point grounding of turbo generator excitation circuits it may be transferred to operate to cause shutdown with a short time delay 2 For generators rated 50MW with star connected stator windings and only three outlet terminals at the neutral point inter turn short circuit protection may be provided as well The inter turn short circuit protection shall instantaneously operate to cause shutdown 3 0 6 Generators shall be provided with protections against external GB T 50062 2008 8 phase to phase short circuit which serve as the backup of main protections and the following requirements shall be complied with 1 Overcurrent protections shall be provided for 1MW and below generators which operate in parallel with other generators or power systems The protections should be configured at the neutral point side of the generators and the operation currents shall be set to be clear of the maximum load current for generators without leads at the neutral point the protections shall be configured at the generator outlets 2 Low voltage or composite voltage actuated overcurrent protections should be provided for generators rated above 1MW The operation current of the current elements may be 1 3 1 4 times the generator ratings and the operation voltage of the low voltage elements may be 0 6 times the voltage ratings for steam turbine generators and 0 7 times the voltage ratings for water turbine generators The operation voltage of the negative sequence voltage elements may be 0 06 0 12 times the voltage ratings 3 Generators rated 50MW may be equipped with negative sequence overcurrent protection and low voltage actuated overcurrent protection The operation current of the negative sequence current elements may be 0 5 0 6 times of the generator current ratings the operation current of the current elements and the operation voltages of the low voltage elements may be determined according to Item 2 above 4 For generator transformer units without circuit breakers installed between the generator and the transformer the generator protections responding to external short circuit shall be used as backup protections and no additional protections shall be provided at the transformer low voltage side if a circuit breaker is installed GB T 50062 2008 9 between the generator and the transformer transformer backup protections may be configured according to Clause 4 0 5 of this code Separate protections shall be equipped on auxiliary branches 5 Low voltage overcurrent protection with current holding features should be provided for self excited shunt wound generator 6 Generator backup protections should be provided with two stage time delay 3 0 7 Overload protections shall be provided to deal with overload of generator stator windings The protections should operate to cause signaling with a time delay 3 0 8 Overvoltage protections to deal with overvoltage of stator windings shall be provided for water turbine generators The operation voltage may be 1 3 1 5 times the voltage ratings and the time delay may be 0 5s The overvoltage protections should operate to cause disconnection and de excitation 3 0 9 Generators rated 50MW and with the value A higher than 10 shall be provided with definite time delay negative sequence overload protections to deal with overload of rotor surface layer resulted from unsymmetrical load open phase operation and unsymmetrical short circuit The protections shall have operation currents set based on continuously allowable negative sequence currents of generators and higher than unbalanced currents of negative sequence current filters under the maximum load and shall operate to cause signaling with a time delay 3 0 10 Grounding protections or grounding detection devices shall be provided to deal with grounding faults of generator excitation circuits which shall comply with the following requirements 1 Periodic detection devices intended for detecting one point grounding faults should be provided for water turbine generators GB T 50062 2008 10 rated 1MW and below one point grounding protections shall be provided for water turbine generators rated above 1MW and shall operate to cause signaling with a time delay and if conditions permit to cause shutdown 2 Grounding detection devices that deal with one point grounding faults shall be provided for steam turbine generators The devices may be provided with two stage settings and should resort to continuous detection 3 0 11 Loss of excitation protection that deals with abnormal drop or complete loss of excitation current shall be provided which shall comply with the following requirements 1 Special loss of excitation protection shall be provided for generators which are not allowed to operate under loss of excitation conditions or those whose loss of excitation will cause significant impact on systems 2 Loss of excitation protections for steam turbine generators should instantaneously operate to cause signaling or to cause disconnection of generators with a time delay if the generator voltage drops to below the allowable value thereafter 3 Loss of excitation protection of water turbine generators should operate to cause disconnection of generators with a time delay 3 0 12 Reverse power protections shall be provided for gas turbine generators The protections should operate to cause signaling with a time delay and further to cause disconnection of generators with a time delay 3 0 13 Excitation transformers of self excited shunt wound generators should be provided with instantaneous current protection as main protection and overcurrent protection as backup protection GB T 50062 2008 11 4 Power Transformer Protection 4 0 1 Power transformers rated 3kV 110kV 63MVA and below shall be equipped with corresponding protections to deal with the following faults and abnormal operating modes 1 Single phase to phase short circuit fault between windings and their outgoing leads and single phase to earth short circuit of systems with neutral solidly grounded or via low resistance 2 Inter turn short circuit of windings 3 Overcurrent caused by external phase to phase short circuit 4 Overcurrent and neutral point overvoltage of power grids with neutral points grounded solidly or via low resistance caused by external grounding short circuit 5 Overload 6 Oil level drop 7 High oil temperature high winding temperature high oil tank press