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NB/T 10326-2019: Code for operating and overhauling of excitation system of small hydropower units
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Code for operating and overhauling of excitation system of small hydropower units
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NB/T 10326-2019
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Basic data | Standard ID | NB/T 10326-2019 (NB/T10326-2019) | | Description (Translated English) | Code for operating and overhauling of excitation system of small hydropower units | | Sector / Industry | Energy Industry Standard (Recommended) | | Classification of Chinese Standard | K55 | | Classification of International Standard | 27.140 | | Word Count Estimation | 15,169 | | Date of Issue | 1900-01-20 | | Date of Implementation | 1900-01-20 | | Issuing agency(ies) | National Energy Administration | NB/T 10326-2019: Code for operating and overhauling of excitation system of small hydropower units
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Code for operating and overhauling of excitation system of small hydropower units
ICS 27.140
K55
Energy Industry Standards of the People's Republic of China
Regulations for operation and maintenance of excitation system of small hydropower units
2019-12-30 released
2020-07-01 implementation
Issued by National Energy Administration
NB
Table of contents
Foreword...II
1 Scope...1
2 Normative references...1
3 General...1
4 Operation of the excitation system...2
5 Operation of the excitation system...3
6 Operation and maintenance of excitation system...4
7 Handling of Excitation System Failure...5
8 Excitation system maintenance...5
9 Test after overhaul of excitation system...7
10 Operation and maintenance technical documents...7
Appendix A (informative appendix) Excitation system maintenance report...9
Appendix B (informative appendix) Excitation system maintenance event registration book, maintenance history...11
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by China Electrical Equipment Industry Association.
This standard is under the jurisdiction of the Energy Industry Standardization Technical Committee for Small Hydropower Units (NEA/T 14).
Drafting organizations of this standard. Guangdong Nanfeng Electric Automation Co., Ltd., Tianjin Ruixin Chuanghe Electric Co., Ltd., Guangdong Yuantian Engineering
Co., Ltd., Landshui Hub Engineering Bureau of Yangtze River Water Resources Commission of Ministry of Water Resources, Wuhan Wushui Electric Technology Co., Ltd., Tianjin Electric Scientific Research
Institute Co., Ltd., Fujian Lead Automation Equipment Co., Ltd., Ruyuan Yao Autonomous County Yinyuan Hydropower Co., Ltd. Quanshui Hydropower Plant, Kunming
Ming Electric Factory Co., Ltd.
The main drafters of this standard. Liu Dongwen, Guo Jia, Xie Ying, Tian Shuangxi, Wang Jinxin, Cao Wenjie, Chen Shutang, Ye Jianfeng, Cao Wuhuai,
He Ping and Huang Wei.
This standard is issued for the first time.
Regulations for operation and maintenance of excitation system of small hydropower units
1 Scope
This standard specifies the procedures to be followed for the operation and maintenance of the excitation system of small hydropower units, including. scope, normative reference documents, general rules,
Operation of excitation system, operation of excitation system, maintenance of excitation system, troubleshooting of excitation system, maintenance of excitation system, excitation system
Test after system overhaul and technical documentation for operation overhaul.
This standard applies to the self-shunt excitation system of small hydropower generators with rated power less than 10MW, and the brushless excitation system of small hydropower generators
Can refer to implementation.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document.
For undated references, the latest version (including all amendments) is applicable to this standard.
GB/T 7409.1 Definition of Synchronous Motor Excitation System
GB/T 14285 Technical Regulations for Relay Protection and Safety Automatic Equipment
GB 26860 Electrical Safety Work Rules for Electrical Parts of Power Plants and Substations
GB/T 50964 Technical specifications for operation and maintenance of small hydropower stations
DL/T 491 Large and medium-sized hydraulic generator self-shunt excitation system and device operation and maintenance regulations
DL/T 516 Power Dispatching Automation System Operation Management Regulations
DL/T 1013 Test Guidelines for Microcomputer Excitation Regulators of Large and Medium Hydrogenerators
DL/T 1066 Management Guidelines for Equipment Maintenance of Hydropower Station
NB/T 42094 Electrical Test Regulations for Small Hydropower Units
NB/T 42097 Technical conditions for brushless excitation of small hydropower units
NB/T 42163 Technical conditions for self-shunt excitation system of small hydropower unit
3 General
3.1 In order to standardize the operation and overhaul (maintenance) of the excitation system of small hydropower units, this standard is specially formulated. The definition of excitation system is in accordance with GB/T 7409.1.
3.2 The operator is responsible for the operation and operation of the excitation system, and shall conduct regular inspections and inspections of the excitation system under its jurisdiction.
时处理。 Time processing. The input or withdrawal of the excitation system shall be carried out in accordance with the requirements of this standard and GB 26860 and DL/T 516.
3.3 The overhaul (maintenance) personnel are responsible for overhaul and daily maintenance of the excitation system. At the same time, the excitation system should be adjusted according to the operation requirements of the power grid.
Close the parameters, and implement the anti-accident measures of the excitation system.
3.4 The operation, overhaul (maintenance) personnel of the excitation system should have relevant professional knowledge and practical experience, have passed the job training, and have
Obtain the corresponding qualification certificate.
3.5 The main equipment of the excitation system includes.
3.6 The main technical documents include.
4 Operation of the excitation system
4.1 Conditions for the excitation system to be put into operation
4.1.1 The relevant technical documents and spare parts of the equipment are available;
4.1.2 The signs of the equipment are complete, correct and clear, all switches, connecting pieces, fuses, etc. are intact, and the wiring is correct;
4.1.3 The various working power supplies specified in the instruction manual provided by the equipment manufacturer are all normal and reliable, and can be switched on or automatically cut as required.
change;
4.1.4 Excitation systems that are put into operation for the first time or after being overhauled shall pass the tests specified in relevant standards, especially the dynamics and statics of the system.
The state characteristics have been verified to meet the requirements of NB/T 42163 and NB/T 42097;
4.1.5 The setting of excitation parameters and the input and removal of related functions shall meet the conditions for integration into the power grid;
4.1.6 The on-site safety facilities are complete and have the conditions for safe operation.
4.2 Normal operation mode of excitation system
4.2.1 All functional units of the excitation system shall be put into operation and operate normally;
4.2.2 The setting value of each equipment parameter of the excitation system shall meet the operation requirements and comply with the relevant standards.
4.3 Abnormal operation mode and treatment principle of excitation system
4.3.1 One of the following situations is the abnormal operation mode of the excitation system
a) The automatic excitation regulator has local software and hardware failures that do not affect the operation of the unit;
b) One adjustment channel of the dual-channel automatic excitation regulator exits operation due to a failure;
c) One of the working power supplies of the automatic excitation regulator cannot be put into operation;
d) Reactive power limitation or rotor current limitation occurs within the range of generator operating limit curve;
e) Any restriction function or protection auxiliary function exits operation;
f) Loss of phase operation occurs in the power unit;
g) The cooling fan of the power unit fails;
h) If the non-linear resistor is used for demagnetization, the non-linear resistor is partially damaged, but the damaged capacity does not exceed 20% of the total capacity;
i) Part of the working power supply of the excitation system disappears.
4.3.2 Principles for handling abnormal operation mode
When the excitation system is in an abnormal operation mode, the operator should closely monitor the operation status of the excitation system and take necessary emergency measures.
To prevent the scope of the fault from expanding, the handling principle.
a) When the automatic excitation regulator has a local software or hardware failure that does not affect the operation of the unit, it should explain the situation to the dispatcher and apply for shutdown.
Overhaul
b) One adjustment channel of the dual-channel automatic excitation regulator can continue to use the spare automatic adjustment channel after it exits operation due to a failure.
The exiting fault channel should be repaired in time;
c) One of the working power supplies of the automatic excitation regulator cannot be put into operation, and the other one of the standby power supplies should be put on automatically.
The faulty power supply should be overhauled in time;
d) Within the range of the generator operating limit curve, if there is a restriction of reactive power or restriction of the rotor current, it should be closely monitored and timely
Explain the situation to the dispatcher and apply for shutdown for maintenance;
e) When any restriction function or protection auxiliary function exits operation, closely monitor and promptly explain the situation to the dispatcher and apply for shutdown
Overhaul
f) The power unit is operating under phase loss. If there is a redundant power unit, it should be immediately switched to the redundant power unit to continue operation, and correct the fault.
Repair the faulty unit. If there is no redundant unit, the excitation current should be appropriately reduced, monitoring should be strengthened and the situation should be explained to the dispatcher in time.
Apply for shutdown for maintenance;
g) If the cooling fan of the power unit fails, it should be repaired within half an hour after the failure occurs. If it cannot be repaired, the dispatcher should explain the situation and apply
Please shut down for maintenance;
h) If the non-linear resistance is used for demagnetization, the non-linear demagnetization resistor is partially damaged, but the damaged capacity does not exceed 20% of the total capacity.
Continue to run, but strengthen monitoring, if the damage continues to expand, you should apply for shutdown for maintenance;
i) Part of the working power supply of the excitation system disappears, and the corresponding backup power supply should be automatically switched on immediately. If there is no backup power supply or the backup power supply cannot
It is automatically put into operation, and should be reported immediately for scheduled shutdown and maintenance.
4.4 Withdrawal of the excitation system
The excitation system should immediately exit operation when any of the following situations occurs.
a) It is found that the insulation of the excitation system has dropped to less than the minimum value allowed by the relevant standards or the minimum value allowed by the manufacturer;
b) The temperature of any device in the excitation system has risen significantly, and after measures are taken, it still exceeds the allowable value specified in 4.4.7 of NB/T 42163-2018
Xu value
c) The contact of the DC switch of the rotor circuit such as the field circuit breaker is overheated, exceeding the allowable value specified by the manufacturer;
d) The rotor overvoltage protection exits due to failure;
e) When the automatic excitation adjustment channel has no backup channel, the AVR adjustment mode of the automatic excitation adjustment channel fails, and the FCR adjustment
The method also fails or cannot be invested;
f) In the case that the automatic excitation adjustment channel has a backup channel, the running channel fails, and the backup channel also fails or cannot automatically
Dynamic input
g) The power unit is faulty, or the power unit cannot guarantee continuous operation of the turbine generator with rated load and rated power factor;
h) The damage capacity of the nonlinear demagnetization resistor exceeds 20% of the total capacity.
5 Operation of the excitation system
5.1 The operation of the excitation system includes the input and withdrawal of the excitation device and related functional units; the increase and decrease operations of the excitation system.
5.2 The operating terminology of the excitation system shall follow the operating terminology specified by the grid dispatching system.
5.3 The activation (exit) operation of the excitation system during automatic (manual) start (stop) of the machine shall be formulated according to the performance and characteristics of the excitation system used
The operation flow of the excitation system input (exit) when the factory (station) automatically (manually) starts (stops) the machine.
---Excitation operation should be carried out after the unit is turned on to more than 95% of the rated speed;
---The de-excitation operation should be performed after the unit is disconnected from the grid (for a unit operating on a single unit or isolated grid, after disconnecting the generator outlet circuit breaker)
Row;
5.4 The input (exit) operation of the excitation cooling circuit and power unit should be based on the performance and system characteristics of the excitation system equipment used.
Formulate the operation flow of the plant (station) excitation cooling circuit and power unit input (exit).
---When the power unit is switched on, the switches on the DC side and the switches on the AC side should be switched in order to trigger the pulse;
---When the power unit exits, the trigger pulse should be exited in sequence, the switch on the AC side, and the switch on the DC side.
5.5 Input and withdrawal operations of the PSS function of the excitation system
5.5.1 The input and withdrawal of the PSS function of the excitation system shall be carried out according to the needs of the grid operation.
5.5.2 The input and withdrawal of the PSS function of the excitation system shall be performed through a switch.
5.5.3 This operation is not available for units operating in stand-alone or isolated network.
5.6 The adjustment operation of generator voltage or reactive power should be carried out according to the needs of operation, which can be done on the control panel of the excitation device or on the unit
It can be performed on the operation panel of the local control unit, and the power plant (station) with remote centralized control function can also be performed on the operation console of the remote centralized control room
Carried on. Power plants (stations) with AVC monitoring system can use the monitoring system AVC function.
5.7 There should be detailed records of the input and withdrawal of the operating personnel (including the computer monitoring system) to each functional unit of the excitation system
6 Operation and maintenance of excitation system
6.1 In accordance with the provisions of GB/T 50964, do a good job in the operation and maintenance of the excitation system.
6.2 Regular inspections of the excitation system
The operation and overhaul (maintenance) personnel of the excitation system shall conduct regular inspections of the excitation system. The number of inspections and time of each power plant (station) can be
Regulations, but the following principles should be followed.
a) The operation personnel of the manned power plant make inspections no less than once a day; the power plant personnel who are not on duty (with few people on duty) make inspections every week
At least 2 inspections. Patrol personnel should keep a record of the patrol, and notify the maintenance (maintenance) personnel to deal with any problems found;
b) Power plant (station) overhaul (maintenance) personnel inspect at least once a week. Patrol personnel should keep a record of the patrol, and should deal with any problems found
Time processing
c) During the abnormal operation of the excitation system, the number of inspections should be increased.
6.3 The main content of the inspection of the excitation system
6.3.1 The main content of the patrol includes excitation transformer, generator slip ring, excitation adjustment unit, power unit, de-excitation unit, overcurrent
Whether the voltage protection circuit, excitation unit, etc., as well as related meters, signal display, sound, smell, temperature, appearance, and operating parameters are normal.
6.3.2 Each power plant (station) shall formulate detailed equipment inspection rules according to the equipment configuration.
6.4 Routine maintenance of excitation system
6.4.1 The main content of daily maintenance work. the treatment of defects found in the operation of the excitation system without stopping the unit; the regular inspection of the excitation system
And operation status analysis.
6.4.2 Each power plant (station) shall formulate detailed inspection and maintenance items and contents according to specific conditions.
7 Troubleshooting of excitation system
7.1 When the following failures of the excitation system are found, measures should be taken immediately and recorded.
7.2 Handling of faults in self-shunt excitation system
7.2.1 Generator rotor overcurrent, loss of excitation, stator overvoltage, excitation transformer overcurrent, excitation due to failure of related equipment in the excitation system
In the event of protection actions such as transformer overheating, erroneous excitation of the excitation system, and erroneous tripping of the field circuit breaker, stop the machine for maintenance immediately. Should pass after overhaul
Relevant test verification can only be put into operation after confirming that the faulty equipment has returned to normal.
7.2.2 Faults such as low wind pressure, slow wind speed, rising wind temperature, and abnormal fluctuations of excitation current and reactive load in the cooling circuit of the power unit,
It can be dealt with during the operation of the generator set; faults such as the excitation transformer, busbar, cables and their connections, and the excessive temperature rise of the magnetic field circuit breaker contacts, should be
Apply to the power dispatcher for shutdown processing.
7.2.3 Single set of redundant excitation regulating unit or redundant working power supply failure, partial branch circuit failure of power unit, non-linear demagnetization resistance damage (loss
If the bad capacity does not exceed 20% of the total capacity) and other faults, the faulty equipment can be removed and continue to operate, otherwise, it should apply to the dispatcher for shutdown.
7.2.4 Faults such as abnormal fluctuations of excitation current and reactive power load can be dealt with during the operation of the generator set. If they cannot be dealt with, they should apply to the dispatcher for shutdown
deal with.
7.2.5 When the generator rotor grounding fault is caused by the fault of the related equipment of the excitation system, it shall be dealt with according to the provisions of GB/T 14285.
7.3 Troubleshooting of brushless excitation system
7.3.1 If the protective relay of the rotating silicon rectifier diode of the brushless excitation system operates or malfunctions, it should be shut down immediately for maintenance and passed after the maintenance.
Relevant test verifications can only be put into operation after confirming that the faulty equipment has returned to normal.
7.3.2 For the treatment of other faults of the brushless excitation system, refer to the method specified in 7.2.
8 Maintenance of excitation system
8.1 Maintenance classification
According to the regulations of DL/T 491, overhaul work can be divided into the following four categories. A/B level overhaul, C level overhaul, D level overhaul, and fault overhaul.
8.2 Maintenance period
8.2.1 The planned maintenance of the excitation system shall follow the provisions of DL/T 1066 and shall be carried out with the planned maintenance of the generator set. The planned overhaul should not affect the development
The overall planned maintenance period of the generator set.
8.2.2 When any one of the abnormal conditions or accidents in the excitation system 7.3 of this standard or other endangering safe operation occurs, it shall be immediately
Downtime. And according to the degree of equipment damage and the difficulty of handling, apply to the dispatcher, and perform maintenance according to the schedule approved by the dispatcher.
8.2.3 Defects left by the excitation system during operation shall be eliminated by the opportunity of shutdown of the generator set for standby or temporary overhaul, and reduce the time of disease operation.
between.
8.3 Maintenance items
8.3.1 The items of maintenance work shall not be less than the content specified in this standard. Based on the implementation of this standard, each factory (station) can be based on actual conditions
Increase the necessary maintenance items.
8.3.2 Class D maintenance items
a) Basic items
1) Cleaning and inspection of various screen (cabinet) components belonging to the excitation system;
2) Check and tighten the electrical primary and secondary wiring terminals of the excitation system;
3) Cleaning and inspection of cooling circuit;
4) Visual inspection of the de-excitation and rotor overvoltage protection device (the brushless excitation system focuses on checking the rotating silicon rectifier diode protection relay);
5) Visual inspection of various transformers, voltage transformers, and current transformers that match the excitation system;
6) Cleaning and inspection of the collector ring of the generator (the brushless excitation system cleans and inspects the collector ring of the AC exciter);
b) Special projects.
1) Defects found in operation but items that can be postponed to D-level overhaul;
2) Preliminary inspection to determine C-level overhaul items.
8.3.3 Class C maintenance items
a) Basic items
1) All D-level maintenance items;
2) Linkage test and signal inspection of the operating circuit of the excitation system;
3) Check the mechanism and operation of important switch appliances;
4) De-excitation and rotor overvoltage protection device inspection (non-linear resistance is tested at least once a year);
5) Excitation transformer preventive test, power unit AC and DC side cable preventive test, excitation transformer high and low voltage side current transformer
Inspection and testing should be carried out according to the NB/T 42094 standard;
6) Operation simulation test inspection of various protection functions of the excitation system;
7) The brushless excitation system focuses on checking the rotating silicon rectifier diode and its protection relay.
b) Special items
1) Defects found in operation can be postponed to the project in C-level maintenance;
2) Preliminary inspection to determine the A/B level maintenance items;
3) The preventive test of the electrical equipment of the excitation system is carried out in accordance with the relevant regulations in NB/T 42094.
8.3.4 Class A/B overhaul items
a) Basic items
1) All C-level maintenance items;
2) Cleaning and inspection of power unit components and auxiliary components, replacement and treatment of damaged components;
3) Cooling circuit cleaning, dust removal, pipeline dust and scale treatment;
4) Maintenance of the fan;
5) Maintenance and adjustment of magnetic field circuit breaker;
6) Maintenance and adjustment of the AC side switch and DC side switch of the power unit;
7) Inspection and testing of demagnetization resistance and protection resistance;
8) Inspection of excitation circuit;
9) Inspection of the rotor circuit and rotor overvoltage protection components;
10) Inspection and treatment of power unit AC and DC circuit cables and busbars;
11) The inspection and debugging of all modules, components and power supply systems belonging to the automatic excitation regulator shall be in accordance with DL/T 1013;
12) Maintenance and test of excitation transformer;
13) Overhaul, test and secondary circuit inspection of voltage transformer, current transformer and power transformer matched with the excitation system;
14) The brushless excitation system is to check and test the rotating silicon rectifier diode and its protective relay;
15) Excitation system operation, control, signal loop and device inspection, debugging, and simulation operation;
16) For the test after the excitation system is overhauled, see Chapter 9 of this standard.
b) Special items
1) Implementation of major anti-accident measures;
2) There are major changes in the equipment structure;
3) Improve the function and performance of the equipment;
4) Renew equipment and remodel;
5) The implementation plan for this special project should be put forward before the overhaul,...
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