This specification is applicable to the design of relay protection and automatic devices for power lines and equipment of 3~110kV in various industries, generators with a single unit capacity of 25MW and below, power transformers with a single unit capacity of 63MVA and below, and other power devices. GB 50062-1992 Design Specification for Relay Protection and Automatic Devices for Power Devices GB50062-1992 Standard download decompression password: www.bzxz.net

Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
GB50062-92
Design code for relaying protectionand automatic device of electric power installation
1992-07-01
State Bureau of Technical Supervision
1992-12-01
Jointly Issued
Ministry of Construction of the People's Republic of China
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Design code for relaying protectionand automatic device of electric power installation
50062-92
Editor Department: Ministry of Energy of the People's Republic of ChinaApproval Department: Ministry of Construction of the People's Republic of ChinaImplementation Date: 1992 December 1, 2009
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Notice on the Release of the National Standard "Design Specifications for Relay Protection and Automatic Devices of Power Installations" Jianbiao (1992] No. 425
According to the requirements of the State Planning Commission's Document No. [1986] 2630, the "Design Specifications for Relay Protection and Automatic Devices of Power Installations" revised by the Ministry of Energy and relevant departments has been reviewed by relevant departments and is now approved as a mandatory national standard, GB50062-92, effective December 1, 1992. The original "Design Code for Relay Protection and Automatic Devices for Industrial and Civil Power Installations" GBJ62-83 is abolished at the same time.
This code is managed by the Ministry of Energy, and the specific interpretation and other work is the responsibility of the Northeast Electric Power Design Institute of the Ministry of Energy. The publication and distribution is organized by the Standard and Quota Research Institute of the Ministry of Construction. Ministry of Construction of the People's Republic of ChinawwW.bzxz.Net
July 7, 1992
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Revision Notes
This code is revised by the Ministry of Energy in accordance with the requirements of the State Planning Commission's Document No. 2630 [1986]. | |tt||During the revision process, the specification group conducted extensive investigations and research, and carefully summarized the design, operation experience and scientific research results of this profession. The Ministry of Energy and relevant departments reviewed and finalized the draft. The main contents of this revision are: adding the protection of lines in the 110KV neutral point directly grounded power grid, the protection of generators of 25MW and below, and the protection of power transformers of 63MVA and below.
In the process of implementing this specification, if you find that there is a need for modification or supplementation, please send your opinions and materials to the Northeast Electric Power Design Institute of the Ministry of Energy (Stalin Street, Changchun City, Jilin Province, Postal Code 130021), and copy to the Electric Power Planning and Design Administration of the Ministry of Energy. Ministry of Energy
February 1991
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Chapter 7
Chapter 8
Chapter 9
Chapter 10
-General Provisions
Protection of generators.
Protection of power transformers.
Protection of lines in 3-63kV power grids with non-directly grounded neutral points·
Protection of lines in 110kV power grids with directly grounded neutral points......
Protection of busbars
Protection of power capacitors
Protection of motors of 3kV and above
Automatic reclosing·
Chapter 11
Chapter 12
Chapter 13
Chapter 14
Appendix—
Appendix 2
Appendix 3
Automatic switching device for standby power supply and standby equipment Automatic under-frequency load reduction device
Synchronous paralleling and de-parallelization
Secondary circuit
Terminology
Synchronous motor and the allowable impulse current multiples of the transformer during self-synchronous and non-synchronous closing
Explanation of terms used in this specification
00000008000
Additional explanation
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·(13)
·(18)
:(26)
(28)
·(32)
(33)
···(35)
Engineering Construction Standard Full Text Information System
Chapter 1 General
Article 1.0.1 This specification is formulated to implement the national technical and economic policies in the design of relay protection and automatic devices of power installations, and to achieve safety, reliability, advanced technology and economic rationality.
Article 1.0.2 This specification applies to the design of relay protection and automatic devices for power equipment such as 3~110kV power lines and equipment in various industries, generators with a single unit capacity of 25MW and below, and power transformers with a capacity of 63MVA and below. Article 1.0.3 The design of relay protection and automatic devices shall select products that have been qualified according to national regulations.
In addition to implementing Article 1.0.4
, the design of relay protection and automatic devices for power equipment shall also comply with the provisions of relevant current national standards and specifications. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter II General Provisions
Article 2.0.1 Power equipment and lines in the power grid shall be equipped with relay protection and automatic devices that respond to short-circuit faults and abnormal operations. Relay protection and automatic devices should be able to cut off short-circuit faults and restore power supply as soon as possible. Article 2.0.2 Power equipment and lines should have main protection, backup protection and abnormal operation protection, and auxiliary protection can be added when necessary. Article 2.0.3 Relay protection and automatic devices should meet the requirements of reliability, selectivity, sensitivity and speed, and should comply with the following provisions: 1. Relay protection and automatic devices should be simple and reliable, use as few components and contacts as possible, have simple wiring circuits, and be easy to operate and maintain. The simplest protection should be adopted under the premise of meeting the requirements.
3. For protection with coordination requirements for adjacent equipment and lines, the sensitivity and action time between the front and rear levels should be coordinated with each other. 3. When a fault occurs within the scope of the protected equipment or line, it should have the necessary sensitivity coefficient.
4. The protection device should be able to cut off the short-circuit fault as soon as possible. When it is necessary to accelerate the removal of the short-circuit fault, the protection device can be allowed to act non-selectively, but the automatic reclosing switch or the automatic input device of the backup power supply should be used to reduce the scope of the power outage. Article 2.0.4 The sensitivity coefficient of the protection device shall be calculated based on the unfavorable normal operation mode and unfavorable fault type. If necessary, the influence of short-circuit current attenuation shall be taken into account. The minimum sensitivity coefficient of various types of relay protection shall meet the requirements of Table 2.0.4. Article 2.0.5 For lines equipped with tubular lightning arresters, the action time of the protection device shall not be greater than 0.08s, and the return time of the starting element of the protection device shall not be less than 0.02s.
Article 2.0.6. Under normal operation, when the secondary circuit of the voltage transformer is broken, the protection classification of the main protection is the main protection of the individual components, the backup protection of the backup protection of the protection class, the current protection with direction or voltage protection of the generator, transformer, line and motor longitudinal differential protection of the generator, transformer, line and motor, the horizontal differential direction and current balance protection of the parallel line, the complete differential protection of the busbar, the distance protection of the current protection and voltage protection of the busbar, the incomplete differential ... tt||Parallel line differential direction and current balance protection Neutral point non-direct grounding protection
Distance protection
Parallel line differential direction protection
Current protection and voltage protection
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Minimum sensitivity coefficient of relay protection
Zero sequence, negative sequence directional element
Differential current element
Current or voltage starting element
Differential current element
Distance starting element
Distance measuring element
Current element and voltage element
Differential current element
Current element| |tt||Current element
Negative sequence and zero sequence incremental (or
real variable) starting element
Zero sequence directional element
Current element, voltage element
Calculated according to the metallic short circuit at the end of the protected areaCalculated according to the metallic short circuit at the end of the protected areaTable 2.0.4
Minimum sensitivity
Before both sides of the line are disconnected, the protection of one side is calculated according to the metallic short circuit at the midpoint of the line
Calculated according to the metallic short circuit
Calculated according to the metallic short circuit at the end of the protected areaCalculated according to the metallic short circuit at the end of the protected areaCalculated according to the metallic short circuit||tt ||After the line is disconnected from one side, it is calculated according to the metallic short circuit of the other side
Calculated according to the metallic short circuit of the end of the protected areaCalculated according to the metallic short circuit of the end of the protected areaBefore both sides of the line are disconnected, one side of the protection is calculated according to the metallic short circuit in the middle of the line
After one side of the line is disconnected, the other side of the protection is calculated according to the metallic short circuit of the opposite side
Calculated according to the metallic short circuit of the adjacent power equipment and the end of the line2
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When the line or other faults can cause the protection device to malfunction, a line break locking device should be installed: When the protection device does not malfunction, a voltage circuit line break signal device should be installed. Article 2.0.7 An indication signal composed of a signal relay or other components should be set in the protection device. The indication signal should meet the following requirements:1. It does not automatically reset when the DC voltage disappears, or it can still maintain the original action state when the DC is restored.
2. It can display the action of each protection device separately. 3. For complex protection devices, the operation of each part and each section can be displayed separately. According to the specific situation of the device, a signal that can reflect the abnormality inside the device can be set. Article 2.0.8 The steady-state ratio error of the current transformer and the intermediate current transformer used in the protection device should not be greater than 10%. For lines and equipment of 35KV and below, when it is technically difficult to meet the requirements and does not cause the protection device to malfunction, a larger error can be allowed.
Article 2.0.9 When a battery pack is used as a DC power supply, the ripple factor caused by the floating charging equipment should not be greater than 5%, and the allowable voltage fluctuation should be controlled within 5% of the rated voltage. The lower limit of the DC bus voltage at the end of discharge should not be lower than 85% of the rated voltage, and the upper limit of the DC bus voltage at the end of charging should not be higher than 115% of the rated voltage. Article 2.0.10 When the AC rectifier power supply is used as a DC power supply for relay protection, it shall meet the following requirements:
, DC bus voltage, the protection action should not be lower than 80% of the rated voltage at maximum load, and the maximum voltage should not exceed 115% of the rated voltage. And measures of voltage stabilization, amplitude limiting and filtering should be taken. The allowable voltage fluctuation should be controlled within 5% of the rated voltage; the ripple factor should not be greater than 5%.
2. When using compound rectification, it should be ensured that the protection device can operate reliably under various operating modes, at different fault points and when short circuits occur in different phases. 3. For substations and hydropower plants using capacitor energy storage power supplies, power equipment and lines should have reliable remote backup protection. In the event of AC power loss, when several sets of protection are activated at the same time, or when the DC energy consumption is the largest in other cases, the protection and circuit breaker should be ensured to operate reliably; the number of power energy storage capacitors in the same place should be compatible with the level of protection.
When using AC-operated protection devices, the short-circuit protection can obtain operating power from the current transformer of the protected element in Article 2.0.11
The gas protection of the transformer and the grounding protection of the power grid with non-direct neutral grounding can obtain the operating power supply from the voltage transformer or the transformer used in the substation, and the capacitor energy storage power supply can also be added as the backup power supply for tripping.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 3
Protection of Generators
Article 3.0.1 Generators with voltage of 3KV and above and capacity of 25MW and below shall be equipped with corresponding protection devices for the following faults and abnormal operation modes: 1. Stator winding phase short circuit;
2. Stator winding grounding;
3. Stator winding turn-to-turn short circuit;
4. Generator external short circuit;
5. Symmetrical overload;
6. Stator winding overvoltage,
7. One-point and two-point grounding of the excitation circuit; 8. Demagnetization fault.
Article 3.0.2 The action modes of the protection device output can be divided into shutdown, decoupling, reducing the scope of fault impact and signal.
Article 3.0.3 For the interphase short circuit fault of the generator stator winding and lead wire, the corresponding protection device should be installed as the main protection of the generator. The protection device should be operated at shutdown and should comply with the following provisions:
, For generators running alone of 1MW and below, if there are lead wires on the neutral point side, overcurrent protection should be installed in reverse at the neutral point. If there are no lead wires on the neutral point side, low voltage protection should be installed at the generator end.
2. Generators running in parallel with other generators or power systems of 1MW and below should be equipped with current quick-break protection at the generator end. When the current quick-break protection is sensitive and does not meet the requirements, longitudinal differential protection can be installed; for generators without lead wires on the neutral point side, low voltage locking overcurrent protection can be installed. 3. For generators above 1MW, longitudinal differential protection should be installed. For the generator transformer group, when there is a circuit breaker between the generator and the transformer, the generator should be equipped with a separate longitudinal differential protection: When there is no circuit breaker between the generator and the transformer, a longitudinal differential protection shared by the generator transformer group should be installed. Article 3.0.4 The stator grounding protection of the generator shall comply with the following provisions: 1. For the generator directly connected to the busbar, excluding the compensation effect of the arc suppression coil, when the single-phase grounding fault current of the stator winding is greater than 4A, a selective grounding protection device should be installed, and its outlet should act on the signal or shutdown. The protection device consists of a zero-sequence current transformer and a current relay installed at the machine end. Its setting value should avoid unbalanced current, with a short-time limit action, and an external short-circuit locking device should be set.
2. A single-phase grounding monitoring device should be installed on the voltage busbar at the generator end, and its outlet should act on the signal.
3. A voltmeter for measuring zero-sequence voltage should be installed at the generator end. 4. A stator grounding protection with a protection area of ​​not less than 90% should be installed for the generator transformer group. The protection device has a time limit to act on the signal, and can also act on the shutdown according to the system conditions and the insulation state of the generator.
Article 3.0.5 The inter-turn short-circuit protection of the generator shall comply with the following provisions: 1. Generators with star-connected stator windings, parallel branches for each phase, and branch lead-out terminals at the neutral point shall be equipped with single-relay cross-connected differential protection. 2. The cross-connected differential protection shall act instantaneously on the shutdown. After one point of the turbine generator excitation circuit is grounded, it can be switched to act on the shutdown with a short time limit. Article 3.0.6 For the external phase-to-phase short-circuit fault of the generator and as a backup for the main protection of the generator, the installed protection shall comply with the following provisions: 1. Generators with a power of 1MW or less and running in parallel with other generators or power systems shall be equipped with overcurrent protection. The protection device should be installed on the neutral point side of the generator, and the operating current should be set according to the maximum load current. For generators without neutral point lead wires, the protection device should be installed on the generator end. 2. Generators above 1MW should be equipped with low-voltage lockout or compound voltage starting overcurrent protection. The operating current of the current element can be taken as 1.31 of the rated value.4 times; low voltage component connection voltage, its action voltage, for steam turbine generator can take rated engineering construction standard full text information system
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