CN110542856B - Offline testing system and method for generator rotor grounding protection carbon brush device - Google Patents
Offline testing system and method for generator rotor grounding protection carbon brush device Download PDFInfo
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- CN110542856B CN110542856B CN201910801422.1A CN201910801422A CN110542856B CN 110542856 B CN110542856 B CN 110542856B CN 201910801422 A CN201910801422 A CN 201910801422A CN 110542856 B CN110542856 B CN 110542856B
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- 238000012360 testing method Methods 0.000 title claims abstract description 126
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims description 12
- 238000004088 simulation Methods 0.000 claims description 5
- 239000000428 dust Substances 0.000 claims description 3
- 238000012795 verification Methods 0.000 description 5
- 235000019606 astringent taste Nutrition 0.000 description 4
- 230000001680 brushing effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000002347 injection 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
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
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Abstract
An off-line test system for a generator rotor ground protection carbon brush device comprises a control subsystem, a ground resistance test subsystem, an analog generator platform subsystem, a carbon brush device subsystem and a wave recorder subsystem; in the control subsystem, an external power supply is connected to a direct current idle switch through a direct current terminal to supply power to an intermediate relay module, the input and exit pressing plate module comprises a start-stop test pressing plate and a control mode pressing plate, the start-stop test pressing plate is used for controlling the start test and the stop of the control subsystem, the control mode pressing plate is used for controlling the automatic control mode and the manual mode of the intermediate relay module, a time relay is used for controlling the automatic action time of the intermediate relay module, the intermediate relay module outputs a contact control card and a counter module, a resistance-capacitance circuit module and a carbon brush device, and the jamming counter module comprises a first counter and a second counter.
Description
Technical Field
The invention relates to the technical field of electrical control, in particular to an offline testing system for a generator rotor ground protection carbon brush device. The system is mainly used for verifying the performance of the generator rotor ground protection carbon brush device and can also be applied to research on generator rotor ground protection influence factors. The system has the advantages of simple loop, capability of realizing manual or automatic control and the like, and ensures the reliable test of the performance of the carbon brush device.
Background
The ground protection of the generator rotor of the M310 reactor type nuclear power unit of the domestic nuclear power plant adopts an injection type ground protection device, and an electrifying loop is formed by regularly lifting an electric brush to be in contact with a slip ring shaft by adopting a brush lifting device to measure the insulation resistance value of a rotor winding. The system has low reliability, false alarms occur for many times in China or the rotor grounding protection is caused to process an invalid running state for a long time due to the fact that the carbon brush device of the system cannot be suitable for the running environment.
Due to the lack of an offline detection system, aiming at the problem of the carbon brush device, the current common method is to detach the carbon brush device when the unit is stopped, detach and clean the carbon brush device, directly detach the carbon brush device without verification, and verify the online performance when the unit is started. In addition, in order to solve the carbon brush device problem, various new and improved carbon brush devices are also designed, but in order to verify whether the performance of the carbon brush device can meet the requirement of the operating condition of the nuclear power plant, the on-line verification is also carried out on a generator set, the new and improved carbon brush device is directly used for replacing an old carbon brush device, and the performance of the new and improved carbon brush device is tested in one period. The online verification method has the following problems that firstly, the carbon brush device cannot be replaced during the running period of the unit, and only can be replaced during the shutdown maintenance period, and the shortest maintenance interval period of the nuclear power unit is one year, so that the verification time is long; secondly, during the operation period, the performance test needs to work according to the nuclear power management flow, and a large amount of time needs to be paid; and thirdly, the AVC system of the unit is quitted from operation due to the alarm during the verification of the device, so that the safe operation of the unit is influenced.
Disclosure of Invention
The invention aims to: in order to meet the requirement of a power plant on performance test of a grounding protection carbon brush device, an offline test system for the grounding protection carbon brush device of a generator rotor is designed.
The technical scheme of the invention is as follows: an off-line test system for a generator rotor ground protection carbon brush device comprises a control subsystem, a ground resistance test subsystem, an analog generator platform subsystem, a carbon brush device subsystem and a wave recorder subsystem;
in the control subsystem, an external power supply is connected to a direct current idle switch through a direct current terminal to supply power to an intermediate relay module, and a switching-in and switching-out pressing plate module comprises a starting and stopping test pressing plate and a control mode pressing plate, wherein the starting and stopping test pressing plate is used for controlling the starting test and the stopping of the control subsystem, the control mode pressing plate is used for controlling the automatic control mode and the manual mode of the intermediate relay module, a time relay is used for controlling the automatic action time of the intermediate relay module, the intermediate relay module outputs a contact control card astringency counter module, a resistance-capacitance circuit module and a carbon brush device, and the astringency counter module comprises a first counter and a second;
in the ground resistance test subsystem, an external power supply is connected to an alternating current air switch through an alternating current terminal to supply power to an alternating current power supply module and a ground resistance test protection device, the alternating current power supply module provides power for a resistance-capacitance circuit module, the resistance-capacitance circuit module forms a ground resistance test circuit loop through a carbon brush device, and the ground resistance test protection device collects voltage and current of the circuit loop from the resistance-capacitance circuit module, outputs counting of a contact control jamming counter module and sends the voltage and the current to a wave recorder.
In the simulation generator platform subsystem, a frequency converter is connected with a motor, a slip ring shaft sleeve is sleeved on a shaft of the motor and rotates along with a motor shaft to simulate the operation of a slip ring shaft of a generator rotor.
In the carbon brush device subsystem, the carbon brush device consists of two carbon brush devices, and when the carbon brush devices are electrified, the carbon brushes can be lifted so as to be contacted with the slip ring shaft sleeve;
in the oscillograph subsystem, the oscillograph records the voltage and current waveforms input to the grounding resistance test protection device.
An external 110V direct-current power supply is connected to a direct-current air switch through a direct-current terminal to supply power to the intermediate relay module.
An external 220V alternating current power supply is connected to an alternating current air switch through an alternating current terminal to supply power to an alternating current power supply module and a grounding resistance test protection device.
The alternating current power supply module provides an alternating current power supply with 40V input to the resistance-capacitance circuit module.
A testing method of an offline testing system of a generator rotor ground protection carbon brush device comprises the following steps:
s1: powering on the device; the control subsystem is externally connected with a 110V direct-current power supply and is powered on through direct-current air switch; the grounding resistance test subsystem is externally connected with a 220V alternating current power supply and is powered on through alternating current air switch; simulating the power-on of a generator platform subsystem, and setting parameters of a frequency converter; a wave recorder of the wave recorder subsystem is connected with a power supply and sets wave recording parameters;
s2: controlling the setting of a subsystem control mode; setting the control mode to be manual control or automatic control through the input and exit pressing plate module according to the requirement, and setting the action time of the time relay so as to control the cycle time of the automatic control mode;
s3: setting parameters of a grounding resistance test subsystem; setting an alarm resistance value and action time of the grounding resistance test protection device; adjusting the grounding resistance value of the resistance-capacitance circuit module, wherein the value is smaller than the alarm resistance value of the grounding resistance test protection device 16;
s4: starting the frequency converter to enable the motor to reach the required rotating speed;
s5: the carbon brush device subsystem simulates an external environment. According to the test requirement, the brush lifting device can be tested in a subsystem of the carbon brush device by matching with external equipment to simulate a dust environment, a high-temperature environment and a strong wind environment. If the environment does not need the step, the step can not be executed;
s6: and when the input and exit pressing plate module is set to be in an automatic control mode, starting a start-stop test pressing plate in the input and exit pressing plate module. The intermediate relay module acts according to the time cycle set by the time relay, and the resistance-capacitance circuit module, the carbon brush device and the jamming counter module are controlled. When the intermediate relay module acts, the intermediate relay module controls the addition of the numerical value of a first counter in the jamming counter module, a test grounding resistance circuit loop is connected and a test of a grounding resistance value is carried out, when the grounding resistance test protection device acts, the grounding resistance test protection device controls the addition of the numerical value of a second counter in the jamming counter module, when the grounding resistance test protection device does not act, the grounding resistance test protection device does not output, and at the moment, the wave recorder records and tests the voltage and current waveform of the grounding resistance circuit loop;
s7: withdrawing the start-stop test pressing plate put into the withdrawing pressing plate module, and controlling the subsystem to pause;
s8: when the input and exit pressing plate module is set to be in a manual control mode, the input and exit of a start-stop test pressing plate in the input and exit pressing plate module are used for controlling the action and the non-action of the intermediate relay module, and the test process of the test grounding resistance circuit loop is the same as the automatic control mode in S6;
s9: and (5) judging the process. Observing and controlling a first counter and a second counter in the jamming counter module, and if the numerical values of the first counter and the second counter are the same, indicating that the carbon brush device subsystem can effectively lift the brush every time;
s10: and after the test times meet the requirements, withdrawing the starting test pressing plate in the module to finish the test.
In the step S1, setting parameters of a frequency converter, including rotating speed and rated voltage; the wave recording parameters comprise a voltage channel and a current channel.
In S2, the cycle time of the automatic control mode is 10S.
In the step S3, the alarm resistance value and the action time of the grounding resistance test protection device are 4000 ohms and 5S.
In S4, the required rotation speed of the motor is 1500 rpm.
In the S3, the alarm resistance value of the grounding resistance test protection device is 2000 ohms.
The invention has the following remarkable effects: the test system can realize manual and automatic brush lifting functions, test of the rotor grounding resistance when the simulation generator operates is completed, test results are easy to check, and the performance of the carbon brush device can be effectively verified. Firstly, the effective brushing lifting times and the ineffective brushing lifting times of the carbon brush device can be accurately calculated through two counting values of a jamming counter loop, and the running reliability of the carbon brush device can be judged in advance; secondly, the waveform of the normal and reliable brushing lifting current is a sine wave through the waveform of the wave recording device, the distortion condition of the waveform is observed, and the effect of each brushing lifting can be analyzed.
Drawings
FIG. 1 is a schematic view of an off-line testing system for a generator rotor ground protection carbon brush apparatus according to the present invention;
in the figure: the system comprises a control subsystem 1, a ground resistance testing subsystem 2, an analog generator platform subsystem 3, a carbon brush device subsystem 4, a wave recorder subsystem 5, a direct current terminal 6, a direct current idle switch 7, a voltage input and output pressing plate module 8, a time relay 9, a middle relay module 10, a jamming counter module 11, an alternating current terminal 12, an alternating current idle switch 13, an alternating current power supply module 14, a capacitance-resistance circuit module 15, a ground resistance testing protection device 16, a wave recorder 17, a frequency converter 18, a motor 19, a slip ring shaft sleeve 20 and a carbon brush device 21;
Detailed Description
An off-line testing system for a generator rotor ground protection carbon brush device comprises a control subsystem 1, a ground resistance testing subsystem 2, an analog generator platform subsystem 3, a carbon brush device subsystem 4 and a wave recorder subsystem 5.
In the control subsystem 1, an external 110V direct-current power supply is connected to a direct-current air switch 7 through a direct-current terminal 6 to supply power to an intermediate relay module 10, a switching-in and switching-out pressing plate module 8 comprises a start-stop test pressing plate and a control mode pressing plate, wherein the start-stop test pressing plate is used for controlling the start test and the stop of the control subsystem 1, the control mode pressing plate is used for controlling the automatic control mode and the manual mode of the intermediate relay module 10, a time relay 9 is used for controlling the automatic action time of the intermediate relay module 10, an output contact control astringency counter module 11 of the intermediate relay module 10, a resistance-capacitance circuit module 15 and a carbon brush device 21, and the astringency counter module 11 comprises a first counter and a.
In the ground resistance test subsystem 2, an external 220V alternating current power supply is connected to an alternating current air switch 13 through an alternating current terminal 12 to supply power to an alternating current power supply module 14 and a ground resistance test protection device 16, the alternating current power supply module 14 provides an input 40V alternating current power supply for a resistance-capacitance circuit module 15, the resistance-capacitance circuit module 15 forms a ground resistance test circuit loop through a carbon brush device 21, and the ground resistance test protection device 16 collects voltage and current of the circuit loop from the resistance-capacitance circuit module 15, outputs a contact control jamming counter module 11 to count and sends out voltage and current to a wave recorder 17.
In the simulation generator platform subsystem 3, a frequency converter 18 is connected with a motor 19, a slip ring shaft sleeve 20 is sleeved on a shaft of the motor 19 and rotates along with the shaft of the motor 19, and the operation of a slip ring shaft of a generator rotor is simulated.
In the carbon brush system 4, the carbon brushes 21 are composed of two carbon brushes, which can be lifted when energized, and thus come into contact with the slip ring sleeve 20.
In the recorder subsystem 5, a recorder 17 records a voltage and current waveform inputted to the ground resistance test protection device 16.
A testing method for an offline testing system of a generator rotor ground protection carbon brush device comprises the following steps:
s1: the device is powered up. The control subsystem 1 is externally connected with a 110V direct-current power supply and is powered on through a direct-current air switch 7; the grounding resistance test subsystem 2 is externally connected with a 220V alternating current power supply and is powered on through an alternating current air switch 13; the simulation generator platform subsystem 3 is electrified, and parameters (including rotating speed and rated voltage) of a frequency converter 18 are set; the wave recorder 17 of the wave recorder subsystem 5 is powered on and sets wave recording parameters (including voltage channel and current channel).
S2: the control subsystem 1 controls the mode setting. If necessary, the operation time of the time relay 9 is set by setting the control mode to manual control or automatic control by the on/off platen module 8, and the cycle time of the automatic control mode is controlled (10 s).
S3: and setting parameters of the grounding resistance testing subsystem 2. Setting an alarm resistance value and action time (4000 ohms and 5s) of the grounding resistance test protection device 16; the resistance-capacitance circuit module 15 adjusts the grounding resistance value, which is smaller than the alarm resistance value (2000 ohm) of the grounding resistance test protection device 16.
S4: the frequency converter 18 is started to bring the motor 19 to the required speed (1500 rpm).
S5: the carbon brush system 4 simulates the external environment. According to the test requirement, the brush lifting device can be tested in the carbon brush device subsystem 4 by matching with external equipment to simulate a dust environment, a high-temperature environment and a strong wind environment. This step may not be performed if not required for the environment.
S6: and when the input and exit pressing plate module 8 is set to be in an automatic control mode, starting and stopping test pressing plates in the input and exit pressing plate module 8. The intermediate relay module 10 operates in a time cycle set by the time relay 9, and controls the rc circuit module 15, the carbon brush device 21, and the jam counter module 11. When the intermediate relay module 10 acts, the intermediate relay module 10 controls the numerical value of a first counter in the jamming counter module 11 to add 1, the test ground resistance circuit loop is switched on and the test of the ground resistance value is carried out, when the ground resistance test protection device 16 acts, the ground resistance test protection device 16 controls the numerical value of a second counter in the jamming counter module 11 to add 1, when the ground resistance test protection device 16 does not act, the ground resistance test protection device 16 does not output, and at the moment, the wave recorder 17 records and tests the voltage and current waveform of the ground resistance circuit loop.
S7: and (4) withdrawing the start-stop test pressing plate put into the pressing plate withdrawing module 8, and controlling the subsystem 1 to pause.
S8: when the throw-in and withdraw-out pressing plate module 8 is set to the manual control mode, the throw-in and withdraw-out of the start-stop test pressing plate in the throw-in and withdraw-out pressing plate module 8 controls the action and the non-action of the intermediate relay module 10, and the test process of the ground resistance circuit test is the same as the automatic control mode in the S6.
S9: and (5) judging the process. Observing and controlling a first counter and a second counter in the jamming counter module 11, and if the numerical values of the first counter and the second counter are the same, indicating that the carbon brush device subsystem 4 can effectively lift the brush each time;
s10: and after the test times meet the requirements, the starting test pressing plate in the module 8 is withdrawn, and the test is finished.
Claims (10)
1. The utility model provides a generator rotor ground protection carbon brush device off-line test system which characterized in that: the system comprises a control subsystem (1), a ground resistance testing subsystem (2), an analog generator platform subsystem (3), a carbon brush device subsystem (4) and a wave recorder subsystem (5);
in the control subsystem (1), an external power supply is connected to a direct current air switch (7) through a direct current terminal (6) to supply power to an intermediate relay module (10), and a switching-in and switching-out pressing plate module (8) comprises a starting and stopping test pressing plate and a control mode pressing plate, wherein the starting and stopping test pressing plate is used for controlling the starting test and the stopping of the control subsystem (1), the control mode pressing plate is used for controlling the automatic control mode and the manual mode of the intermediate relay module (10), a time relay (9) is used for controlling the automatic action time of the intermediate relay module (10), an output contact of the intermediate relay module (10) controls a block counter module (11), a resistance-capacitance circuit module (15) and a carbon brush device (21), and the jamming counter module (11) comprises a first counter and a second counter;
in the ground resistance test subsystem (2), an external power supply is connected to an alternating current air switch (13) through an alternating current terminal (12) to supply power to an alternating current power supply module (14) and a ground resistance test protection device (16), the alternating current power supply module (14) provides power for a resistance-capacitance circuit module (15), the resistance-capacitance circuit module (15) forms a ground resistance test circuit loop through a carbon brush device (21), the ground resistance test protection device (16) collects voltage and current of the circuit loop from the resistance-capacitance circuit module (15), outputs a contact control jamming counter module (11) to count, and sends out voltage and current to a recorder (17);
in the simulation generator platform subsystem (3), a frequency converter (18) is connected with a motor (19), a slip ring shaft sleeve (20) is sleeved on a shaft of the motor (19) and rotates along with the shaft of the motor (19), and the operation of a slip ring shaft of a generator rotor is simulated;
in the carbon brush device subsystem (4), the carbon brush device (21) consists of two carbon brush devices, and when the carbon brush devices are electrified, the carbon brushes can be lifted so as to be contacted with the slip ring shaft sleeve (20);
in the wave recorder subsystem (5), a wave recorder (17) records the voltage and current waveforms input to the grounding resistance test protection device (16).
2. The off-line testing system for the ground protection carbon brush device of the generator rotor according to claim 1, characterized in that: an external 110V direct current power supply is connected to a direct current air switch (7) through a direct current terminal (6) to supply power to the intermediate relay module (10).
3. The off-line testing system for the ground protection carbon brush device of the generator rotor according to claim 1, characterized in that: an external 220V alternating current power supply is connected to an alternating current air switch (13) through an alternating current terminal (12) to supply power to an alternating current power supply module (14) and a grounding resistance test protection device (16).
4. The off-line testing system for the ground protection carbon brush device of the generator rotor according to claim 1, characterized in that: the alternating current power supply module (14) provides an alternating current power supply with 40V input to the resistance-capacitance circuit module (15).
5. A testing method using the off-line testing system for the generator rotor ground protection carbon brush device according to claim 1, characterized in that: the method comprises the following steps:
s1: powering on the device; the control subsystem (1) is externally connected with a 110V direct-current power supply and is powered on through a direct-current air switch (7); the grounding resistance test subsystem (2) is externally connected with a 220V alternating current power supply and is powered up through an alternating current air switch (13); simulating the power-on of the generator platform subsystem (3), and setting parameters of a frequency converter (18); a wave recorder (17) of the wave recorder subsystem (5) is connected with a power supply and sets wave recording parameters;
s2: setting a control mode of a control subsystem (1); setting a control mode to be manual control or automatic control through the input and exit pressing plate module (8) according to requirements, and setting the action time of a time relay (9) so as to control the cycle time of the automatic control mode;
s3: setting parameters of the grounding resistance test subsystem (2); setting an alarm resistance value and action time of a grounding resistance test protection device (16); the grounding resistance value of the resistance-capacitance circuit module (15) is adjusted, and the value is smaller than the alarm resistance value of the grounding resistance test protection device (16);
s4: starting the frequency converter (18) to enable the motor (19) to reach the required rotating speed;
s5: the carbon brush device subsystem (4) simulates an external environment; according to the test requirement, the carbon brush device subsystem (4) can be matched with external equipment to simulate a dust environment, a high-temperature environment and a strong wind environment to test the brush lifting device; if the environment does not need the step, the step can not be executed;
s6: when the input and exit pressing plate module (8) is set to be in an automatic control mode, starting a start-stop test pressing plate in the input and exit pressing plate module (8); the intermediate relay module (10) acts according to the time cycle set by the time relay (9) to realize the control of the resistance-capacitance circuit module (15), the carbon brush device (21) and the jamming counter module (11); when the intermediate relay module (10) acts, the intermediate relay module (10) controls the numerical value of a first counter in the jamming counter module (11) to add 1, a test grounding resistance circuit is connected and a grounding resistance value is tested, when the grounding resistance test protection device (16) acts, the grounding resistance test protection device (16) controls the numerical value of a second counter in the jamming counter module (11) to add 1, when the grounding resistance test protection device (16) does not act, the grounding resistance test protection device is not output, and at the moment, the wave recorder (17) records and tests the voltage and current waveform of the grounding resistance circuit;
s7: withdrawing the start-stop test pressing plate put into the withdrawing pressing plate module (8), and controlling the subsystem (1) to pause;
s8: when the input and exit pressure plate module (8) is set to be in a manual control mode, the input and exit of a start-stop test pressure plate in the input and exit pressure plate module (8) are used for controlling the action and the non-action of the intermediate relay module (10), and the test process of the ground resistance circuit test is the same as the automatic control mode in S6;
s9: judging the process; observing and controlling a first counter and a second counter in the jamming counter module (11), and if the numerical values of the first counter and the second counter are the same, indicating that the carbon brush device subsystem (4) can effectively lift the brush each time;
s10: and after the test times meet the requirements, the starting test pressing plate put into the pressing plate withdrawing module (8) is withdrawn, and the test is finished.
6. The off-line testing method of the generator rotor ground protection carbon brush device according to claim 5, characterized in that: in the step S1, parameters of the frequency converter (18) are set to include rotating speed and rated voltage; the wave recording parameters comprise a voltage channel and a current channel.
7. The off-line testing method of the generator rotor ground protection carbon brush device according to claim 6, characterized in that: in S2, the cycle time of the automatic control mode is 10S.
8. The off-line testing method of the generator rotor ground protection carbon brush device according to claim 6, characterized in that: in the S3, the alarm resistance value and the action time of the grounding resistance test protection device (16) are 4000 ohms and 5S.
9. The off-line testing method of the generator rotor ground protection carbon brush device according to claim 6, characterized in that: in S4, the required rotation speed of the motor (19) is 1500 rpm.
10. The off-line testing method of the generator rotor ground protection carbon brush device according to claim 6, characterized in that: in the S3, the alarm resistance value of the grounding resistance test protection device (16) is 2000 ohms.
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| CN112067981A (en) * | 2020-07-30 | 2020-12-11 | 大唐大丰风电开发有限公司 | Real-time monitoring system for isolating switch |
| CN112881807B (en) * | 2021-01-08 | 2023-11-14 | 大唐长春第二热电有限责任公司 | Tool and method for measuring loop resistance and carbon brush loop resistance of generator rotor |
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