CN113138336B - Test method for measuring voltage and power direction of generator by short route test in high plant - Google Patents

Test method for measuring voltage and power direction of generator by short route test in high plant Download PDF

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Publication number
CN113138336B
CN113138336B CN202110409548.1A CN202110409548A CN113138336B CN 113138336 B CN113138336 B CN 113138336B CN 202110409548 A CN202110409548 A CN 202110409548A CN 113138336 B CN113138336 B CN 113138336B
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generator
voltage
current
short
test
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CN113138336A (en
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张文斌
张钢
谢贝贝
何信林
周亚群
高景辉
赵晖
张灏
倪继文
刘冲
方子朝
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Xian Thermal Power Research Institute Co Ltd
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Xian Thermal Power Research Institute Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines
    • G01R31/343—Testing dynamo-electric machines in operation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults

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  • General Physics & Mathematics (AREA)
  • Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)

Abstract

The invention discloses a test method for testing and measuring voltage and power direction of a generator by a shortened road in a high plant, which comprises the following steps: 1) Increasing the secondary current of the low-voltage side of the factory to a preset current value, and checking and recording the current amplitude, the phase and the differential protection differential current of a current loop; 2) Raising the short-circuit current of the high-voltage side to the rated current I2Stopping magnetizing, checking and recording generator end current I1And a terminal voltage U; 3) The power and the impedance direction of the generator protection cabinet are checked and recorded, the correctness of a PT loop of the generator is checked under the working condition of low voltage at the generator end, and the test of measuring the voltage and the power direction of the generator by the short-path test in a high-rise factory is completed.

Description

Test method for measuring voltage and power direction of generator by short route test in high plant
Technical Field
The invention relates to a test method, in particular to a test method for measuring the voltage and power direction of a generator in a short-route test in a high-rise factory.
Background
Before the power plant is put into operation, an electrical complete set of starting tests are required to test whether the unit can reach the condition of trial production. The generator-transformer set short-circuit test is that when a generator is in a rated rotating speed and a three-phase short circuit of a generator-transformer set is generated, exciting current is gradually increased to simulate the load operation of the generator and a transformer, so that the short-circuit characteristic curve of the generator is recorded, main parameters of the generator are calculated, the symmetry of three-phase currents of the generator, a main transformer and a high-rise transformer is checked, and the correctness of a current loop and a protection vector of the generator-transformer set is verified; the generator no-load test aims at checking the correctness of the generator PT loop and the generator no-load characteristic, and is an especially important link in the whole starting test process of a power plant.
The generator-transformer set short-circuit test comprises a generator short-circuit test, a main transformer high-voltage side short-circuit test and a high-factory transformer low-voltage side short-circuit test. Firstly, mounting a short-circuit busbar at an outlet seal nut of a generator, measuring a short-circuit curve of the generator, and removing the short-circuit busbar after a short-circuit test of the generator is completed; secondly, three-phase short circuit is carried out on the high-voltage side of the main transformer, a grounding wire (a grounding disconnecting link is generally used) is connected in a hanging mode, the capacity of the grounding disconnecting link is limited, the voltage of the generator end does not exceed 150A generally after long-time operation, the voltage of the generator end does not exceed 500V, the power direction and the impedance phase angle are not easy to determine on a protection device, and the grounding wire and the three-phase short circuit wire are detached after the short circuit test of the high-voltage side of the main transformer is completed; and finally, carrying out short circuit on the low-voltage branch at the low-voltage side of the high-voltage plant through the short-circuit trolley, and pulling out the short-circuit trolley after the short-circuit test at the low-voltage side of the high-voltage plant is completed. And after the short-circuit test is finished, carrying out a generator no-load test, generally boosting the voltage to 10% of rated voltage in the no-load test, checking the correctness of a PT loop of the generator, then slowly boosting the voltage to the rated voltage, and recording a no-load characteristic curve. During a generator-transformer set short-circuit test and a no-load test, the current-voltage phase angle of the relay protection device and the measuring instrument is not obvious, the power and the impedance direction of the generator are not easy to determine, and the generator can be checked only after being connected with a grid and carrying a load, so that the generator lacks directional protection such as power impedance in the initial stage of being connected with the grid and carrying the load, however, the test time for detecting the power and the impedance protection of the generator in the conventional generator-transformer set short-circuit test is too long.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a test method for testing and measuring the voltage and the power direction of a generator by a short circuit in a high-rise factory.
In order to achieve the purpose, the test method for testing and measuring the voltage and the power direction of the generator by the short circuit of the high-rise station comprises the following steps:
1) Increasing the secondary current of the low-voltage side of the factory to a preset current value, and checking and recording the current amplitude, the phase and the differential protection differential current of a current loop;
2) The short-circuit current of the high-voltage side and the low-voltage side of the factory is increased to the rated current I2Stopping magnetizing, checking and recording generator end current I1And a terminal voltage U;
3) The power and the impedance direction of the generator protection cabinet are checked and recorded, the correctness of a PT loop of the generator is checked under the working condition of low voltage at the generator end, and the test of measuring the voltage and the power direction of the generator by short circuit test in a high plant is completed.
The method also comprises the following steps before the step 1): and (5) confirming the name plate parameters of the high factory change.
The name plate parameters of the high-voltage substation comprise the rated capacity S of the high-voltage substation and the rated voltage of the high-voltage side is UeAnd short-circuit impedance is Ud％。
The preset current value is 0.1A.
Terminal voltage U ≈ Ud％×(Ue 2/S)×I1，Ud% of high factory-to-short circuit impedance, UeThe rated voltage of the generator and S are the capacity of the high-speed plant.
The invention has the following beneficial effects:
according to the test method for measuring the voltage and the power direction of the generator by the high-plant short-circuit test, during specific operation, the current on the low-voltage side of the high-plant short-circuit test is increased to the rated value, so that the power and impedance direction detection flow of the generator is simplified, meanwhile, the low-voltage check of the PT circuit at the generator end is carried out in advance, a foundation is laid for the next no-load test of the generator, the defect that the whole set of test time is too long is avoided, the test efficiency is improved, the accuracy of protection and inspection is ensured, the safe and reliable operation of a unit is ensured, the shutdown times during debugging are reduced, and the operation cost is saved.
Drawings
FIG. 1 is a schematic diagram of the present invention during a high plant short circuit test.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the test method for measuring the voltage and power direction of the generator by the short-circuiting test in the high-rise station comprises the following steps:
1. preparation before testing
The installation of a generator end short-circuit point K1 short-circuit busbar is ensured to be firm, and the contact is good; the three-phase short circuit of a high-voltage side short circuit point K2 of the main transformer is good, and the ground wire is reliably grounded; the short circuit points K3 and K4 on the low-voltage side of the high-voltage substation are reliably grounded through the short circuit trolley, no inflammable substance exists around the short circuit points, and isolation warning measures are taken.
2. Generator short circuit test (K1 short circuit point)
The method comprises the steps of confirming that the stator current, the rotor current and the rotor voltage of the generator are connected into a generator characteristic tester, starting the generator characteristic tester, enabling the stator current of the generator to slowly rise by operating an on-site magnetism increasing button on an excitation regulator cabinet, stopping magnetism increasing when the secondary current of the generator rises to 0.1A, checking and recording the current amplitude, the phase and the differential protection differential current of a relevant current loop, and reducing the stator current of the generator to the minimum value by operating an on-site magnetism reducing button on the excitation regulator after checking that abnormal phenomena do not occur.
After no abnormal phenomenon is detected, a generator short-circuit characteristic test (from the highest current rise to the rated current of the generator) is respectively obtained by operating an on-site magnetism increasing button and an on-site magnetism reducing button on an excitation regulator, short-circuit characteristic data and a short-circuit characteristic curve are recorded, after the test is finished, the current of a generator stator is reduced to the minimum value, a magnetic switch is tripped, a circuit breaker of an excitation transformer high-voltage side power supply is disconnected, a ground wire is hung, and a generator short-circuit busbar is detached.
3. Main transformer high-voltage side short circuit test (K2 short circuit point)
The three-phase short circuit of a high-voltage side short circuit point K2 of a main transformer is performed, an on-site magnetizing button on an excitation regulator is operated, the main transformer high-voltage side short circuit current is large in position 100A, the current amplitude, the phase and the differential protection differential current of a relevant current loop are checked and recorded, after the abnormal phenomenon is checked, the on-site demagnetizing button on the excitation regulator is operated, the generator stator current is reduced to the minimum value, a demagnetizing switch is tripped, and then the excitation variable high-voltage side power circuit breaker is disconnected.
4. High factory transformer low voltage side short circuit test (K3, K4 short circuit point)
The current of the stator of the generator is slowly increased by operating the local magnetism increasing button on the excitation regulator cabinet, when the secondary current on the low-voltage side of the transformer in a high-voltage plant is increased to 0.1A, the magnetism increasing is stopped, checking and recording current amplitude, phase and differential protection differential current of related current loop, continuously increasing magnetism, increasing current of low-voltage side of high-voltage transformer to rated value, stopping increasing magnetism, checking and recording current I of generator terminal1And terminal voltage U, wherein the terminal voltage U is approximately equal to Ud％×(Ue 2/S)×I1，Ud% of high factory-to-short circuit impedance, UeRated voltage of the generator, S is high plant capacity variation, I1And (3) checking and recording the power and impedance direction of the generator protection cabinet for generator end current, checking the correctness of a generator PT loop under the condition of low voltage at the generator end, after the checking is finished, reducing the current of a stator of the generator to the minimum value through a local demagnetization button on the excitation regulator cabinet, tripping a demagnetization switch, then disconnecting a circuit breaker of the excitation variable high-voltage side power supply, and finishing the short-circuit test.
In conclusion, on the premise of ensuring the test correctness, the invention can optimize the defects of overlong test time for detecting the power of the generator and impedance protection in the conventional generator-transformer set short-circuit test, greatly reduce the test time, simplify the test flow and improve the efficiency and the accuracy.

Claims (8)

1. A test method for testing and measuring voltage and power direction of a generator in a short route in a high plant is characterized by comprising the following steps:
1) Increasing the secondary current of the low-voltage side of the factory to a preset current value, and checking and recording the current amplitude, the phase and the differential protection differential current of a current loop;
2) The short-circuit current of the high-voltage side and the low-voltage side of the factory is increased to the rated current I2Stopping increasing magnetism, checking and recording generator end current I1And a terminal voltage U;
3) The power and the impedance direction of the generator protection cabinet are checked and recorded, the correctness of a PT loop of the generator under the working condition of low voltage at the generator end is checked, and the test of measuring the voltage and the power direction of the generator by short-circuit test in a high-rise plant is completed.
2. The test method for testing and measuring the voltage and the power direction of the generator in the short-circuiting test of the high-rise station according to claim 1, further comprising the following steps before step 1): and (5) confirming the name plate parameters of the high factory change.
3. The method as claimed in claim 2, wherein the parameter of the nameplate of the high-speed transformer includes a short-circuit impedance of the high-speed transformer as Ud％。
4. The test method for measuring the voltage and power direction of the generator by the high-rise short-circuit test according to claim 2, wherein the nameplate parameters of the high-rise transformer comprise the rated capacity S of the high-rise transformer.
5. The method as claimed in claim 2, wherein the nameplate parameters of the high-speed transformer include a rated voltage of the high-speed side of the high-speed transformer as Ue。
6. The method as claimed in claim 1, wherein the predetermined current value is 0.1A.
7. The method as claimed in claim 1, wherein the terminal voltage U ≈ Ud％×(Ue 2/S)×I1，Ud% of high factory-to-short circuit impedance, UeThe rated voltage of the generator and S is the high plant capacity.
8. The test method for measuring the voltage and power direction of a generator according to claim 1, wherein the magnetization and the demagnetization are performed by operating an on-site magnetization-increasing button and an on-site demagnetization-decreasing button on the excitation regulator.
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CN113740764B (en) * 2021-08-25 2024-09-03 中电华创(苏州)电力技术研究有限公司 On-line detection method and device for turn-to-turn short circuit defect of generator rotor winding

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CN103278790A (en) * 2012-11-29 2013-09-04 杭州凯达电力建设有限公司 Fast testing instrument of variable ratio and polarity of current transformer and testing method thereof
CN108614213A (en) * 2018-05-24 2018-10-02 中国神华能源股份有限公司 The polarity test method of transformer unit differential protection
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