CN113985309B - Performance test system and method for security power supply system of power plant - Google Patents
Performance test system and method for security power supply system of power plant Download PDFInfo
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- CN113985309B CN113985309B CN202111267125.7A CN202111267125A CN113985309B CN 113985309 B CN113985309 B CN 113985309B CN 202111267125 A CN202111267125 A CN 202111267125A CN 113985309 B CN113985309 B CN 113985309B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000011056 performance test Methods 0.000 title claims abstract description 17
- 238000012360 testing method Methods 0.000 claims description 101
- 230000007547 defect Effects 0.000 claims description 13
- 230000001052 transient effect Effects 0.000 claims description 8
- 238000011156 evaluation Methods 0.000 claims description 6
- 238000000819 phase cycle Methods 0.000 claims description 6
- 238000011084 recovery Methods 0.000 claims description 6
- 230000006641 stabilisation Effects 0.000 claims description 5
- 238000011105 stabilization Methods 0.000 claims description 5
- 230000033228 biological regulation Effects 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000013461 design Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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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
- G01R31/40—Testing power supplies
Abstract
The invention discloses a performance test system and a performance test method of a security power supply system of a power plant.A power supply section PC I of the power plant is connected with a security PC section through a feeder circuit breaker 1DL of the power supply section PC I of the power plant and a working power circuit breaker 3DL of the security section; the factory power supply section PC II is connected with the security PC section through the factory power supply section PC II feeder circuit breaker 2DL and the security section standby power circuit breaker 4 DL; the emergency diesel generator is connected with the security PC section through a diesel generator outlet breaker 01DL and a security section emergency power supply breaker 02 DL; the security PC section is connected with the security section load through the security section load breaker XXDL, and the system and the method can effectively improve the security reliability of the security power supply system of the power plant.
Description
Technical Field
The invention belongs to the technical field of electric power debugging and electric power test, and relates to a performance test system and method of a security power supply system of a power plant.
Background
The power supply object of the diesel generator set of the power plant as a safety power supply is accident safety load, and the definition of the technical specification of factory power design of the DL/T5153-2014 thermal power plant is that the accident safety load is the load which needs to be continuously supplied when power failure occurs in the whole factory or the unit set loses the factory power in order to ensure the safe shutdown of the machine furnace, restart the machine furnace quickly after the machine furnace, or prevent the reasons such as endangering personal safety, and the like.
However, at present, technical standards such as "the debugging technical Specification of the thermal power generation construction engineering Unit" of DL/T5294-2013 in China have no clear description on specific requirements and evaluation standards of a security power supply system testing method. The debugging of the security power supply system in DL/T5294-2013 thermal power generation construction engineering set debugging technical specification only requires: the subsystem debugging is performed to check a system loop and a commissioning test, and the whole set of system debugging is performed to perform a security power switching test. The acceptance criteria of the "DLT 5295-2013 thermal power generation construction engineering unit debugging quality acceptance and evaluation procedure" on security power supply system debugging unit engineering are: normal operation and meets the design and standard requirements. Only the electric interlocking condition of the diesel generator is specified in the technical specification of station service electricity design of the DLT 5153-2014 thermal power plant.
Before the diesel generator is put into operation, if the performance of the diesel generator is not tested by the system, the phenomenon that the load of the diesel generator set of the security power supply system is unsuccessful often occurs in actual operation, and great hidden danger is caused for the safe shutdown of the power plant.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a performance test system and a performance test method for a security power supply system of a power plant, which can effectively improve the safety and reliability of the security power supply system of the power plant.
In order to achieve the above purpose, the performance test system of the security power system of the power plant of the invention is characterized by comprising a factory power supply section PC I section, a factory power supply section PC II section, a factory power supply section PC I section feeder breaker 1DL, a factory power supply section PC II section feeder breaker 2DL, a security section working power breaker 3DL, a security section standby power breaker 4DL, a security PC section, an emergency diesel generator, a diesel generator outlet breaker 01DL, a security section emergency power breaker 02DL, a security section load breaker XXDL and an automatic device;
the factory power supply section PC I section is connected with the security PC section through the factory power supply section PC I section feeder circuit breaker 1DL and the security section working power circuit breaker 3 DL; the factory power supply section PC II is connected with the security PC section through the factory power supply section PC II feeder circuit breaker 2DL and the security section standby power circuit breaker 4 DL; the emergency diesel generator is connected with the security PC section through a diesel generator outlet breaker 01DL and a security section emergency power supply breaker 02 DL;
the security PC section is connected with the security section load through a security section load breaker XXDL;
the automatic device is connected with a factory power supply section PC I section feeder circuit breaker 1DL, a factory power supply section PC II section feeder circuit breaker 2DL, a security section working power circuit breaker 3DL, a security section standby power circuit breaker 4DL, an emergency diesel generator, a diesel generator outlet circuit breaker 01DL, a security section emergency power circuit breaker 02DL and a security section load circuit breaker XXDL.
The performance test method of the security power supply system of the power plant comprises the following steps:
1) The safety power supply system completes a system switching test, the switching logic and the switch act without errors, and the emergency diesel generator is started normally;
2) The no-load test of the emergency diesel generator is completed, and the outlet voltage and the phase sequence of the emergency diesel generator are correct;
3) Performing a charging test of a security electric emergency power supply system;
4) Carrying out no-load switching test from a working power supply of a security section to an emergency diesel generator;
5) Carrying out emergency power supply load test;
6) Carrying out a load switching test from a working power supply of a security PC section to an emergency diesel generator;
the test conditions of step 3) are: the load of the security section is completely stopped, the security PC section is isolated from a normal power supply, the security PC section is out of voltage, and the emergency diesel generator is available;
the test content is as follows: and (3) manually starting the emergency diesel generator, starting and building voltage of the emergency diesel generator, closing a diesel generator outlet breaker 01DL and a security section emergency power supply breaker 02DL after the voltage and frequency of the emergency diesel generator meet the requirements, and supplying power to a security PC section through the emergency diesel generator.
The test conditions of step 4) are:
the load of the security section is completely deactivated, and before the test, the security PC section is powered by a working power supply, and the emergency diesel generator is available;
the test content is as follows: after the working power supply of the security PC section fails or the voltage deviation exceeds a preset value, an automatic device automatically starts an emergency diesel generator, a feeder circuit breaker 1DL of the PC I section of the power supply section for a factory is disconnected, after time delay, the emergency diesel generator is verified to be automatically started after power failure, and after the voltage establishment is completed, an outlet circuit breaker 01DL of the diesel generator is automatically switched on, and the security PC section is powered by the emergency diesel generator.
The test conditions of step 5) are: the load of the security section is all available, before the test, the security PC section is powered by a working power supply, and the emergency diesel generator is available;
the test content is as follows:
a) Loading 50% of rated power of an emergency diesel generator for testing;
b) Load starting test of the emergency diesel generator with 20% of rated power of the emergency diesel generator;
c) A 100% rated power test is loaded.
The test result judging conditions of the step 3) are as follows:
a) Measuring the phase sequence as a forward sequence;
b) The time from the starting of the emergency diesel generator to the completion of the no-load rotating speed pressure building is not more than 10s;
c) The rotating speed adjusting range of the emergency diesel generator is not less than 80-110% of the rated rotating speed, and the change rate of the adjusting rotating speed is within the rated rotating speed range of 0.5-1.5% per second;
d) The voltage deviation of the emergency diesel generator is less than 1%, and the frequency band is less than 0.5%;
and (3) eliminating the defect and re-executing the step (3) when the test result judging condition is not met.
The test result judging conditions in the step 4) are as follows:
a) The recovery time from the failure power failure of the working power supply to the emergency power supply of the security PC section is not more than 15s;
b) The delay time for starting the emergency diesel generator is 1.5 to 2 seconds longer than the normal switching time of the thermal power plant;
and (4) eliminating the defect when the test result judging condition is not met, and re-executing the step (4).
The test result judging conditions in the step 5) are as follows:
a) The steady-state voltage regulation rate is less than or equal to +/-0.5% Un;
b) The transient voltage adjustment rate is +20% to-15%Un;
c) The voltage stabilizing time is less than 1s;
d) The voltage fluctuation rate is less than or equal to 0.5%;
e) Steady-state frequency adjustment rate < + -1%;
f) Transient frequency adjustment rate is < + -5%;
g) The frequency stabilization time is less than 5s;
h) The frequency fluctuation rate is less than or equal to 0.5%;
and (5) eliminating the defect when the test result judging condition is not met, and then re-executing the step (5).
The test result judging conditions in the step 6) are as follows:
a) The lowest voltage >75Un;
b) The lowest frequency >47.5Hz;
c) Load recovery longest duration <2s;
d) The voltage after loading is more than 95% un;
e) The frequency after loading is >49.5Hz;
and (3) when the test result judging condition is not met, eliminating the defect, and then re-executing the step (6).
The invention has the following beneficial effects:
when the performance test system and the performance test method for the security power supply system of the power plant are specifically operated, the charging test of the security power emergency power supply system, the no-load switching test of the working power supply of the security section to the emergency diesel generator, the load test of the emergency power supply and the load switching test of the working power supply of the security PC section to the emergency diesel generator are sequentially carried out, so that the safety and reliability of the security power supply system of the power plant are improved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a flow chart of the present invention.
Wherein, 1 is the power supply section PC I section of the factory, 2 is the power supply section PC II section of the factory, 3 is the feeder circuit breaker 1DL of the power supply section PC I section of the factory, 4 is the feeder circuit breaker 2DL of the power supply section PC II section of the factory, 5 is the working power circuit breaker 3DL of the security section, 6 is the standby power circuit breaker 4DL of the security section, 7 is the security PC section, 8 is the emergency diesel generator, 9 is the exit circuit breaker 01DL of the diesel generator, 10 is the emergency power circuit breaker 02DL of the security section, 11 is the load circuit breaker XXDL of the security section, 12 is the automatic device.
Detailed Description
In order to make the present invention better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments, but not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
In the accompanying drawings, there is shown a schematic structural diagram in accordance with a disclosed embodiment of the invention. The figures are not drawn to scale, wherein certain details are exaggerated for clarity of presentation and may have been omitted. The shapes of the various regions, layers and their relative sizes, positional relationships shown in the drawings are merely exemplary, may in practice deviate due to manufacturing tolerances or technical limitations, and one skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions as actually required.
Referring to fig. 1, the performance test system of the security power system of the power plant of the present invention includes a factory power supply section PC I section 1, a factory power supply section PC II section 2, a factory power supply section PC I section feeder breaker 1DL3, a factory power supply section PC II section feeder breaker 2DL4, a security section working power breaker 3DL5, a security section standby power breaker 4DL6, a security PC section 7, an emergency diesel generator 8, a diesel generator outlet breaker 01DL9, a security section emergency power breaker 02DL10, a security section load breaker XXDL11, and an automatic device 12;
the factory power supply section PC I section 1 is connected with the security PC section 7 through the factory power supply section PC I section feeder circuit breaker 1DL3 and the security section working power circuit breaker 3DL 5; the factory power supply section PC II section 2 is connected with the security PC section 7 through the factory power supply section PC II section feeder circuit breaker 2DL4 and the security section standby power circuit breaker 4DL 6; the emergency diesel generator 8 is connected with the security PC section 7 through a diesel generator outlet breaker 01DL9 and a security section emergency power supply breaker 02DL 10;
the security PC section 7 is connected with the security section load through a security section load breaker XXDL 11;
the automatic device 12 is connected to the factory power supply PC I feeder breaker 1DL3, the factory power supply PC II feeder breaker 2DL4, the security work power breaker 3DL5, the security standby power breaker 4DL6, the emergency diesel generator 8, the diesel generator outlet breaker 01DL9, the security emergency power breaker 02DL10, and the security load breaker XXDL 11.
Referring to fig. 2, the performance test method of the security power system of the power plant according to the present invention comprises the following steps:
1) The safety power system completes a system switching test, the switching logic and the switch act without errors, and the emergency diesel generator 8 is started normally;
2) The no-load test of the emergency diesel generator 8 is completed, and the outlet voltage and phase sequence of the emergency diesel generator 8 are correct;
3) Performing a charging test of a security electric emergency power supply system;
the test conditions were: the load of the security section is completely disabled, the security PC section 7 is isolated from the normal power supply, the security PC section 7 is out of voltage, and the emergency diesel generator 8 is available.
The test content is as follows: the emergency diesel generator 8 is started manually, the emergency diesel generator 8 is started and is pressurized, after the voltage and frequency of the emergency diesel generator 8 meet the requirements, the emergency diesel generator outlet breaker 01DL9 and the emergency power circuit breaker 02DL10 of the security PC section 7 are closed, and power is supplied to the security PC section 7 through the emergency diesel generator 8.
4) Carrying out no-load switching test from a working power supply of a security section to the emergency diesel generator 8;
the test conditions were: the load of the security section is completely deactivated, and before the test, the security PC section 7 is powered by a working power supply, and the emergency diesel generator 8 is available.
The test content is as follows: after the working power supply of the security PC section 7 fails or the voltage deviation exceeds a preset value, the automatic device 12 automatically starts the emergency diesel generator 8, the feeder circuit breaker 1DL3 of the PC I section of the power supply section for the factory is disconnected, after time delay, the emergency diesel generator 8 is verified to be automatically started through power failure, after the voltage establishment is completed, the outlet circuit breaker 01DL9 of the diesel generator is automatically closed, and the security PC section 7 is powered by the emergency diesel generator 8.
5) Carrying out emergency power supply load test;
the test conditions were: the load of the security section is all available, and before the test, the security PC section 7 is powered by a working power supply, and the emergency diesel generator 8 is available.
The test content is as follows:
a) And (3) loading 50% of rated power of the emergency diesel generator 8 for testing, and specifically, the emergency diesel generator 8 stably operates for 2 seconds and has the condition of first loading, wherein the first loading is not lower than 50% of the rated power of the emergency diesel generator 8.
b) The load starting test of the emergency diesel generator 8 with the rated power of 20% of the emergency diesel generator 8 is carried out, and specifically, the full voltage direct starting of the squirrel-cage asynchronous motor with the rated capacity of not less than 20% of the emergency diesel generator 8 is loaded within 2 seconds of the stable operation of the emergency diesel generator 8;
c) And loading 100% rated power test, specifically, loading the load to the full load of the emergency diesel generator 8 within 20 seconds after the load is successful, and allowing long-term operation when the load capacity is not lower than 90% of the rated power of the emergency diesel generator 8.
Recording test power, current, frequency, power factor, voltage variation range and frequency variation range data, and calculating steady-state voltage adjustment rate, transient voltage adjustment rate, voltage stabilization time, voltage fluctuation rate, steady-state frequency adjustment rate, transient frequency adjustment rate, frequency stabilization time and frequency fluctuation rate according to the test power, current, frequency, power factor, voltage variation range and frequency variation range data.
6) The working power supply of the security PC section 7 switches the test to the emergency diesel generator 8 in load;
the test conditions were: when the security PC section 7 operates normally according to the unit, the security section load operates, the security PC section 7 is powered by a working power supply, the diesel generator outlet breaker 01DL9 is in hot standby, and the emergency diesel generator 8 is in hot standby.
The test content is as follows: the feeder circuit breaker 1DL3 of the PC I section of the power supply section for the disconnection factory is powered off, the security PC section 7 is powered off, and during the voltage loss simulation of the security PC section 7, the distribution load switch keeps a state before the power loss in the power loss process of the security PC section 7, and the motor load switch is in a tripping and opening state.
After the emergency diesel generator 8 is started and builds pressure, a power supply is provided for the security PC section 7 through the emergency diesel generator 8.
In the loading process, in order to ensure the voltage stability of the emergency power supply, the load of the security section is input in batches, the self-holding load which is not lost due to power failure of the security PC section 7 is loaded for the first time, and after the loading is successful, the follow-up security Duan Fuhe is input in batches according to the process requirement of the safe shutdown of the generator set of the power plant; the load of the operated safety section is not stopped due to the starting of the subsequent load, the input power and the starting time of the load of the safety section are recorded successively in the process of inputting the load of the safety section, and when the related parameters do not meet the expected value of the test result judgment in the starting process, the capacity of the load of the safety section started in the batch is adjusted. Finally, the load type and the load capacity of the security section are input in batches and are determined by negotiations of the testers and owners according to the test results. The working power supply of the security PC section 7 is powered off, and in the starting process of the emergency diesel generator 8, if the working power supply is recovered, the emergency diesel generator 8 is started, keeps the running state and provides power for the security PC section 7.
7) And (5) ending the test.
In the step 3), the judging conditions including the test result are as follows:
a) The measured phase sequence is the forward sequence.
b) The time from the start of the emergency diesel generator 8 to the completion of the no-load rotational speed pressure build-up is not more than 10s.
c) The speed regulation range of the emergency diesel generator 8 is not less than 80-110% of the rated speed, and the rate of change of the regulated speed is within the rated speed range of 0.5-1.5% per second.
d) The voltage deviation of the emergency diesel generator 8 is <1%, and the frequency band is <0.5%.
And (3) eliminating the defects when the test result does not meet the test result judgment, and re-executing the step (3).
Step 4), including test result judging conditions:
a) The recovery time from the failure power failure of the working power supply of the security PC section 7 to the emergency power supply is not more than 15s;
b) The delay time for starting the emergency diesel generator 8 is longer than the normal switching time of the thermal power plant, and is about 1.5 to 2 seconds;
and (4) eliminating the defects when the test result does not meet the test result judgment, and re-executing the step (4).
In step 5), the test results of the test are judged as follows:
a) Steady-state voltage regulation rate is less than or equal to + -0.5% Un
b) Transient voltage adjustment rate is +20% to-15%Un
c) The voltage stabilizing time is less than 1s
d) The voltage fluctuation rate is less than or equal to 0.5 percent
e) Steady-state frequency adjustment rate < + -1%
f) Transient frequency adjustment rate is < + -5%
g) The frequency stabilization time is less than 5s
h) The frequency fluctuation rate is less than or equal to 0.5 percent
When the test result does not meet the test result judgment, eliminating the defect, and then re-executing the step 5);
step 6), including test result judgment:
a) Minimum voltage >75Un
b) Lowest frequency >47.5Hz
c) Load recovery maximum duration <2s
d) Voltage after loading >95% un
e) The frequency after loading is >49.5Hz
And (3) eliminating the defects when the test result does not meet the test result judgment, and then re-executing the step (6).
The invention is suitable for a power plant security power system with a security section configured with a diesel generator.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent structural changes made to the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (9)
1. The performance test system of the security power supply system of the power plant is characterized by comprising a power supply section PCI section (1) for the power plant, a power supply section PCII section (2) for the power plant, a power supply section PCI section feeder circuit breaker 1DL (3) for the power plant, a power supply section PCII section feeder circuit breaker 2DL (4) for the power plant, a power supply section working power circuit breaker 3DL (5), a security section standby power circuit breaker 4DL (6), a security PC section (7), an emergency diesel generator (8), a diesel generator outlet circuit breaker 01DL (9), a security section emergency power circuit breaker 02DL (10), a security section load circuit breaker XXDL (11) and an automatic device (12);
the power supply section PCI section (1) of the factory is connected with the security PC section (7) through the power supply section PCI section feeder circuit breaker 1DL (3) of the factory and the security section working power circuit breaker 3DL (5); the factory power supply section PC II section (2) is connected with the security PC section (7) through the factory power supply section PC II section feeder circuit breaker 2DL (4) and the security section standby power circuit breaker 4DL (6); the emergency diesel generator (8) is connected with the security PC section (7) through a diesel generator outlet breaker 01DL (9) and a security section emergency power supply breaker 02DL (10);
the security PC section (7) is connected with the security section load through a security section load breaker XXDL (11);
the automatic device (12) is connected with a factory power supply section PC I section feeder breaker 1DL (3), a factory power supply section PCII section feeder breaker 2DL (4), a security section working power supply breaker 3DL (5), a security section standby power supply breaker 4DL (6), an emergency diesel generator (8), a diesel generator outlet breaker 01DL (9), a security section emergency power supply breaker 02DL (10) and a security section load breaker XXDL (11).
2. A performance test method for a security power system of a power plant, characterized in that the performance test system based on the security power system of the power plant of claim 1 comprises the following steps:
1) The safety power system completes a system switching test, the switching logic and the switch act without errors, and the emergency diesel generator (8) is started normally;
2) Completing an idle load test of the emergency diesel generator (8), wherein the outlet voltage and the phase sequence of the emergency diesel generator (8) are correct;
3) Performing a charging test of a security electric emergency power supply system;
4) Carrying out no-load switching test from a working power supply of a security section to an emergency diesel generator (8);
5) Carrying out emergency power supply load test;
6) The working power supply of the security PC section (7) switches the test to the emergency diesel generator (8) in a load manner.
3. The method for testing the performance of a security power system of a power plant according to claim 2, wherein the testing conditions of step 3) are: the load of the security section is completely stopped, the security PC section (7) is isolated from a normal power supply, the security PC section (7) is out of voltage, and the emergency diesel generator (8) is available;
the test content is as follows: the emergency diesel generator (8) is started manually, the emergency diesel generator (8) is started and is pressurized, after the voltage and frequency of the emergency diesel generator (8) meet the requirements, the emergency diesel generator outlet breaker 01DL (9) and the emergency power circuit breaker 02DL (10) are closed, and power is supplied to the emergency PC section (7) through the emergency diesel generator (8).
4. The method for testing the performance of a power plant security power system according to claim 2, wherein the testing conditions of step 4) are:
the load of the security section is completely deactivated, and before the test, the security PC section (7) is powered by a working power supply, and the emergency diesel generator (8) is available;
the test content is as follows: after the working power supply of the security PC section (7) fails or the voltage deviation exceeds a preset value, an automatic device (12) automatically starts an emergency diesel generator (8), a power supply section PC I feeder circuit breaker 1DL (3) for a factory is disconnected, after time delay, the emergency diesel generator (8) is verified to be automatically started after power failure, after the voltage establishment is completed, a diesel generator outlet circuit breaker 01DL (9) is automatically switched on, and the security PC section (7) is powered by the emergency diesel generator (8).
5. The method for testing the performance of a security power system of a power plant according to claim 2, wherein the testing conditions of step 5) are: the load of the security section is all available, before the test, the security PC section (7) is powered by a working power supply, and the emergency diesel generator (8) is available;
the test content is as follows:
a) Loading 50% of rated power of an emergency diesel generator (8) for testing;
b) The load starting test of the emergency diesel generator (8) with the rated power of 20% of the emergency diesel generator (8);
c) A 100% rated power test is loaded.
6. The performance test method of a security power system of a power plant according to claim 3, wherein the test result evaluation condition of step 3) is:
a) Measuring the phase sequence as a forward sequence;
b) The time from the starting of the emergency diesel generator (8) to the completion of the no-load rotating speed pressure building is not more than 10s;
c) The rotating speed adjusting range of the emergency diesel generator (8) is not less than 80-110% of the rated rotating speed, and the change rate of the adjusting rotating speed is within the rated rotating speed range of 0.5-1.5% per second;
d) The voltage deviation of the emergency diesel generator (8) is less than 1%, and the frequency band is less than 0.5%;
and (3) eliminating the defect and re-executing the step (3) when the test result judging condition is not met.
7. The method for testing the performance of a power plant security power system according to claim 4, wherein the test result evaluation condition in the step 4) is:
a) The time from the failure power failure of the working power supply of the security PC section (7) to the recovery of the emergency power supply is not more than 15s;
b) The delay time for starting the emergency diesel generator (8) is 1.5 to 2 seconds longer than the normal switching time of the thermal power plant;
and (4) eliminating the defect when the test result judging condition is not met, and re-executing the step (4).
8. The method for testing the performance of a security power system of a power plant according to claim 5, wherein the test result evaluation condition in step 5) is:
a) The steady-state voltage regulation rate is less than or equal to +/-0.5% Un;
b) The transient voltage adjustment rate is +20% to-15%Un;
c) The voltage stabilizing time is less than 1s;
d) The voltage fluctuation rate is less than or equal to 0.5%;
e) Steady-state frequency adjustment rate < + -1%;
f) Transient frequency adjustment rate is < + -5%;
g) The frequency stabilization time is less than 5s;
h) The frequency fluctuation rate is less than or equal to 0.5%;
and (5) eliminating the defect when the test result judging condition is not met, and then re-executing the step (5).
9. The method for testing the performance of a power plant security power system according to claim 6, wherein the test result evaluation condition in step 6) is:
a) The lowest voltage >75Un;
b) The lowest frequency >47.5Hz;
c) Load recovery longest duration <2s;
d) The voltage after loading is more than 95% un;
e) The frequency after loading is >49.5Hz;
and (3) when the test result judging condition is not met, eliminating the defect, and then re-executing the step (6).
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| Publication number | Priority date | Publication date | Assignee | Title |
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