CN110736922B - Device and method for measuring switch-on pre-breakdown time - Google Patents
Device and method for measuring switch-on pre-breakdown time Download PDFInfo
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- 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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
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Abstract
The invention relates to the technical field of high-voltage switch equipment and high-voltage electrical appliances, in particular to a device and a method for measuring switch closing pre-breakdown time. The method loads a set voltage value at two ends of a grounding switch to be tested through a direct-current voltage generating device, and controls the grounding switch to be tested to be switched on; acquiring a stroke signal before and after the grounding switch to be tested is switched on, and acquiring a first time point corresponding to the change of the stroke signal; acquiring voltage signals at two ends of a grounding switch to be detected, and acquiring a second time point corresponding to the jump of the voltage signals; the pre-breakdown time is determined from the difference between the first point in time and the second point in time. The starting time of the pre-breakdown time is determined by obtaining the stroke change of the grounding switch to be tested, and the ending time of the pre-breakdown time is determined by monitoring the voltage jump of the grounding switch to be tested, so that the pre-breakdown time is accurately obtained.
Description
Technical Field
The invention relates to the technical field of high-voltage switch equipment and high-voltage electrical appliances, in particular to a device and a method for measuring switch closing pre-breakdown time.
Background
With the development of the ultra-high voltage transmission technology, the safety and reliability of the ultra-high voltage transmission system are paid more and more attention, and due to the complexity of the power grid system, the requirement on the equipment of the power grid system is higher and higher, and how to strictly check the performance reliability of a high-voltage electric appliance in the power grid is of great importance. The pre-breakdown time is generally determined by a closing test of a GIS (gas insulated switchgear) grounding switch, a capacitor tower is used for high-voltage discharge in the test, but the existing closing test has the following defects:
1) the capacitor tower is used for carrying out high-voltage discharge on the grounding switch, and due to the fact that the closing voltage is high, the requirement on a test loop is high, the requirement on loop equipment is high, the cost is high, and a certain test risk exists;
2) the pre-breakdown time is determined only by monitoring the change condition of the voltage at two ends of the grounding switch, but the accuracy of judging the pre-breakdown time by the voltage is lower, and the precision and the reliability are poorer.
Disclosure of Invention
The invention aims to provide a device and a method for measuring the pre-breakdown time of switch closing, which are used for solving the problem of inaccurate detection of the pre-breakdown time of the existing grounding switch.
In order to achieve the above object, the present invention provides a method for measuring a switch-on pre-breakdown time, comprising the following steps:
1) loading a set voltage value at two ends of the grounding switch to be tested through a direct-current voltage generating device, and controlling the grounding switch to be tested to be switched on;
2) acquiring a stroke signal before and after the grounding switch to be tested is switched on, and acquiring a first time point corresponding to the change of the stroke signal;
3) acquiring voltage signals at two ends of a grounding switch to be detected, and acquiring a second time point corresponding to the jump of the voltage signals;
4) the pre-breakdown time is determined from the difference between the first point in time and the second point in time.
The method has the advantages that the starting time of the pre-breakdown time is determined by obtaining the stroke change of the grounding switch to be tested, and the ending time of the pre-breakdown time is determined by monitoring the voltage jump of the grounding switch to be tested, so that the pre-breakdown time is accurately obtained.
Further, in order to simply and safely realize the generation of the set voltage value, the direct-current voltage generating device is an impulse voltage generator. The short-time voltage is directly applied to the two ends of the grounding switch to be tested through the impulse voltage generator, the requirement on a test loop is low, the requirement on loop equipment is low, the cost is reduced, and the test risk is greatly reduced compared with the use of equipment such as a capacitor tower.
The invention provides a device for measuring the switch-on pre-breakdown time, which comprises a direct-current voltage generating device, a voltage sampling device, a travel sensor, a processor and a switching-on and switching-off driving device, wherein the direct-current voltage generating device is connected with the travel sensor;
the direct-current voltage generating device is used for loading a set voltage value at two ends of the grounding switch to be tested;
the voltage sampling device is used for collecting voltage signals at two ends of the grounding switch to be tested;
the stroke sensor is used for acquiring a stroke signal of the grounding switch to be detected;
the output end of the switching-on/off driving device is used for being connected with the grounding switch to be tested so as to realize the switching-on operation of the grounding switch to be tested;
the first input end of the processor is connected with the voltage sampling device, the second input end of the processor is connected with the travel sensor, the processor acquires a first time point corresponding to the start of change of the travel signal and a second time point corresponding to the jump of the voltage signal, and the time difference between the first time point and the second time point is used as pre-breakdown time.
The method has the advantages that the starting time of the pre-breakdown time is determined by obtaining the stroke change of the grounding switch to be tested, and the ending time of the pre-breakdown time is determined by monitoring the voltage jump of the grounding switch to be tested, so that the pre-breakdown time is accurately obtained.
Further, in order to improve the safety of the test and the accuracy of signal acquisition, the stroke sensor is connected with the second input end of the processor sequentially through the first electro-optical converter, the first optical fiber and the first electro-optical converter.
Further, in order to improve the safety and control accuracy of the test, the output end of the switching-on/off driving device is connected with the grounding switch to be tested sequentially through a second electro-optical converter, a second optical fiber and a second photoelectric converter.
Further, in order to realize direct observation of the test result, the voltage sampling device and the stroke sensor are also connected with an oscilloscope.
Further, in order to simply realize the voltage monitoring, the voltage sampling device is a resistor voltage divider.
Furthermore, in order to simply and safely realize the control of the on-off of the grounding switch, the on-off driving device is a mechanical characteristic tester.
Further, in order to simply and safely realize the generation of the set voltage value, the direct-current voltage generating device is an impulse voltage generator. The short-time voltage is directly applied to the two ends of the grounding switch to be tested through the impulse voltage generator, the requirement on a test loop is low, the requirement on loop equipment is low, the cost is reduced, and the test risk is greatly reduced compared with the use of equipment such as a capacitor tower.
Drawings
FIG. 1 is a schematic diagram of a method for measuring the closing pre-breakdown time of a GIS grounding switch according to the invention;
FIG. 2 is a schematic diagram of a GIS grounding switch closing pre-breakdown time measuring device according to the present invention;
in the figure, 1 is a surge voltage generator, 2 is a resistor divider, 3 is a GIS grounding switch, 4 is a stroke sensor, 5 is a first electro-optical converter, 6 is a first photoelectric converter, 7 is a processor, 8 is a second photoelectric converter, 9 is a second electro-optical converter, and 10 is a mechanical characteristic tester.
Detailed Description
The switch of the invention takes a GIS grounding switch as an example, and the invention is further explained in detail by combining the attached drawings.
The method comprises the following steps:
the invention provides a method for measuring the closing pre-breakdown time of a GIS grounding switch, which comprises the following steps:
1) and loading a set voltage value at two ends of the grounding switch to be tested through the impulse voltage generator, and controlling the grounding switch to be tested to be switched on.
The impulse voltage generator is essentially a direct current voltage generating device, and can generate a certain voltage according to requirements, wherein the set voltage value is larger than 100 kV.
2) And acquiring a stroke signal before and after the grounding switch to be tested is switched on, and acquiring a first time point corresponding to the change of the stroke signal.
Can monitor GIS earthing switch's stroke and the time data that corresponds through the stroke sensor, as other embodiments, can also realize the monitoring through other sensors that can detect the position such as displacement sensor, position sensor.
3) And acquiring voltage signals at two ends of the grounding switch to be tested, and acquiring a second time point corresponding to the jump of the voltage signals.
Because GIS earthing switch both ends are loaded with voltage, can the voltage at GIS earthing switch both ends of safety inspection through resistance voltage divider, resistance voltage divider is a voltage sampling device essentially, as other implementation manners, also can realize voltage monitoring through other voltage detection equipment such as voltage transformer.
4) The pre-breakdown time is determined from the difference between the first point in time and the second point in time.
As shown in fig. 1, below the time t axis is a stroke curve of the to-be-detected GIS grounding switch monitored by the stroke sensor, when a change of the stroke signal is detected, a first time point corresponding to the change of the stroke signal is t0，t0And t2The time difference between the two is the closing time.
Above the time t-axis is the loaded voltage signal curve, U, monitored by means of a resistive voltage divider1Representing a set voltage value, at a first point in time t0Then, if a voltage signal jump occurs, the second time point corresponding to the voltage signal jump is t1At t1The moment is a breakdown point, the voltage begins to drop at the moment, and t is read0And t1The time difference between them is the closing pre-breakdown time.
Apparatus example 1:
the invention provides a device for measuring the closing pre-breakdown time of a GIS grounding switch, which is a device structure capable of realizing the measuring method.
As shown in fig. 2, the measuring device includes a surge voltage generator 1, a resistance divider 2, a stroke sensor 4, a processor 7, and a mechanical characteristic tester 10; the positive pole and the negative pole of the impulse voltage generator 1 are connected with two ends of a GIS grounding switch 3 and used for generating a short-time set voltage value; the resistance voltage divider 2 is arranged at two ends of the GIS grounding switch 3 in parallel to detect the voltage at the two ends; the travel sensor 4 is used for detecting the travel of the GIS grounding switch 3 and collecting travel signals of the GIS grounding switch. The impulse voltage generator 1 is essentially a dc voltage generating device, and can generate a certain set voltage value according to the requirement, and as another embodiment, the impulse voltage generator 1 can also be replaced by another existing voltage generator.
In this embodiment, the resistor divider 2 is used to detect voltage, and the resistor divider 2 is essentially a voltage sampling device, and as another embodiment, the resistor divider 2 may also be replaced by other existing devices such as a voltage transformer.
The output end of the mechanical characteristic tester 10 is connected with the GIS grounding switch 3 through the second electro-optical converter 9, the second optical fiber and the second photoelectric converter 8 so as to control the opening and closing operation of the GIS grounding switch 3. In order to facilitate the switching-on and switching-off operation, the mechanical characteristic tester is used for performing the switching-on and switching-off operation of the grounding switch in the embodiment, and the mechanical characteristic tester is essentially a switching-on and switching-off driving device, and as other embodiments, other devices capable of driving the switching-on and switching-off of the switch can be used. In addition, in the present embodiment, the mechanical characteristic tester 10 is connected to the GIS ground switch 3 by means of optical fiber isolation, but as another embodiment, it may be connected by means of hard wire or the like.
The first input end of the processor 7 is connected with the resistor divider 2, the second input end of the processor 7 is connected with the stroke sensor 4 through the first photoelectric converter 6, the first optical fiber and the first photoelectric converter 5, the processor 7 acquires a first time point corresponding to the starting change of the stroke signal and a second time point corresponding to the jump of the voltage signal, and the time difference between the first time point and the second time point is used as the pre-breakdown time. In the present embodiment, the processor 7 and the stroke sensor 4 are isolated by an optical fiber, and as another embodiment, other forms of isolated or non-isolated connection may be adopted.
Apparatus example 2:
the invention provides a device for measuring the closing pre-breakdown time of a GIS grounding switch, which is based on the device embodiment 1 and is convenient for directly observing a test result, and the device also comprises an oscilloscope, wherein the first input end of the oscilloscope is connected with a resistance voltage divider 2, the second input end of the oscilloscope is connected with a stroke sensor 4, and a voltage signal and a stroke signal are displayed in the oscilloscope.
In order to ensure the accuracy of the stroke signal, the stroke sensor 4 is connected with an oscilloscope sequentially through a third electro-optical converter, a third optical fiber and a third electro-optical converter.
The present invention has been described in relation to particular embodiments thereof, but the invention is not limited to the described embodiments. In the thought given by the present invention, the technical means in the above embodiments are changed, replaced, modified in a manner that is easily imaginable to those skilled in the art, and the functions are basically the same as the corresponding technical means in the present invention, and the purpose of the invention is basically the same, so that the technical scheme formed by fine tuning the above embodiments still falls into the protection scope of the present invention.
Claims (9)
1. A method for measuring the switch-on pre-breakdown time is characterized by comprising the following steps:
1) loading a set voltage value at two ends of the grounding switch to be tested through a direct-current voltage generating device, and controlling the grounding switch to be tested to be switched on;
2) acquiring a stroke signal before and after the grounding switch to be tested is switched on, and acquiring a first time point corresponding to the change of the stroke signal;
3) acquiring voltage signals at two ends of a grounding switch to be detected, and acquiring a second time point corresponding to the jump of the voltage signals; the second time point is a breakdown point, and the voltage begins to drop at the moment;
4) the pre-breakdown time is determined from the difference between the first point in time and the second point in time.
2. The method of claim 1, wherein the dc voltage generator is a surge voltage generator.
3. A measuring device for switch-on pre-breakdown time is characterized by comprising a direct-current voltage generating device, a voltage sampling device, a travel sensor, a processor and a switching-on and switching-off driving device;
the direct-current voltage generating device is used for loading a set voltage value at two ends of the grounding switch to be tested;
the voltage sampling device is used for collecting voltage signals at two ends of the grounding switch to be tested;
the stroke sensor is used for acquiring a stroke signal of the grounding switch to be detected;
the output end of the switching-on/off driving device is used for being connected with the grounding switch to be tested so as to realize the switching-on operation of the grounding switch to be tested;
the first input end of the processor is connected with the voltage sampling device, the second input end of the processor is connected with the travel sensor, the processor acquires a first time point corresponding to the starting change of the travel signal and a second time point corresponding to the jump of the voltage signal, the second time point is a breakdown point, the voltage starts to drop at the moment, and the time difference between the first time point and the second time point is used as pre-breakdown time.
4. The apparatus of claim 3, wherein the stroke sensor is connected to the second input terminal of the processor sequentially through a first electro-optic converter, a first optical fiber and a first electro-optic converter.
5. The device for measuring the switch-on pre-breakdown time of the switch according to claim 3 or 4, wherein the output end of the switching-off and switching-on driving device is connected with the grounding switch to be tested sequentially through a second electro-optical converter, a second optical fiber and a second photoelectric converter.
6. The apparatus for measuring the switch-on pre-breakdown time of claim 3, wherein an oscilloscope is further connected to the voltage sampling device and the stroke sensor.
7. The apparatus for measuring switch-on pre-breakdown time according to claim 3 or 6, wherein the voltage sampling device is a resistor divider.
8. The device for measuring the switch-on pre-breakdown time of a switch according to claim 3, wherein the opening and closing driving device is a mechanical characteristic tester.
9. The apparatus of claim 3, wherein the DC voltage generator is a surge voltage generator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910855088.8A CN110736922B (en) | 2019-09-10 | 2019-09-10 | Device and method for measuring switch-on pre-breakdown time |
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| CN201910855088.8A CN110736922B (en) | 2019-09-10 | 2019-09-10 | Device and method for measuring switch-on pre-breakdown time |
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| CN110736922B true CN110736922B (en) | 2022-03-29 |
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| CN114113944B (en) * | 2021-11-25 | 2023-10-20 | 广东电网有限责任公司 | CVT capacitor unit breakdown defect test method and device |
| CN114994527B (en) * | 2022-07-15 | 2022-10-25 | 中国电力科学研究院有限公司 | Grounding closing test device and method for perfluoroisobutyronitrile insulated metal-enclosed switchgear |
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| CN102435941A (en) * | 2011-09-07 | 2012-05-02 | 中国电力科学研究院 | Method for simulating very fast transient over-voltage during opening/closing process of isolating switch |
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| CN105353302A (en) * | 2015-11-20 | 2016-02-24 | 清华大学 | Detection device and detection method for arcing time of switch equipment |
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|---|---|---|---|---|
| CN102435941A (en) * | 2011-09-07 | 2012-05-02 | 中国电力科学研究院 | Method for simulating very fast transient over-voltage during opening/closing process of isolating switch |
| CN103558545A (en) * | 2013-11-16 | 2014-02-05 | 沈阳工业大学 | Device and method for detecting on-off prebreakdown time of breaker |
| EP2995966A1 (en) * | 2014-09-09 | 2016-03-16 | ABB Technology AG | Method and device for online monitoring of high voltage circuit breaker |
| CN105353302A (en) * | 2015-11-20 | 2016-02-24 | 清华大学 | Detection device and detection method for arcing time of switch equipment |
Non-Patent Citations (1)
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