阅读说明：本技术 一种开关关合预击穿时间的测量装置及方法 (Device and method for measuring closing pre-breakdown time of switches ) 是由 王卫东 谭盛武 段晓辉 柴影辉 马书豪 李智勇 高杨 邢文奇 孙英杰 董祥渊 占 于 2019-09-10 设计创作，主要内容包括：本发明涉及高压开关设备、高压电器技术领域,特别是一种开关关合预击穿时间的测量装置及方法。该方法通过直流电压产生装置在待测接地开关两端加载设定电压值,控制待测接地开关合闸；获取待测接地开关合闸前后的行程信号,得到行程信号开始变化对应的第一时间点；获取待测接地开关两端的电压信号,得到电压信号跳变对应的第二时间点；根据第一时间点和第二时间点之间的差值确定预击穿时间。通过获取待测接地开关的行程变化确定预击穿时间的起始时间,通过监测待测接地开关的电压跳变确定预击穿时间的终止时间,从而准确得到预击穿时间,相比现有技术而言,预击穿时间计算更加准确、简单,可靠性较高。(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 the pre-breakdown time of switch closures, wherein the method comprises the steps of loading set voltage values at two ends of a grounding switch to be tested through a direct-current voltage generating device, controlling the grounding switch to be tested to be closed, obtaining a stroke signal before and after the grounding switch to be tested is closed, obtaining a th time point corresponding to the change of the stroke signal, obtaining voltage signals at two ends of the grounding switch to be tested, obtaining a second time point corresponding to the jump of the voltage signal, determining the pre-breakdown time according to the difference value between a th time point and the second time point, determining the initial time of the pre-breakdown time through obtaining the stroke change of the grounding switch to be tested, and determining the termination time of the pre-breakdown time through monitoring the voltage jump of the grounding switch to be tested, so that the pre-breakdown time is accurately obtained.)

The method for measuring the switch-on pre-breakdown time of the switches is characterized by comprising the following steps of:

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 th time point corresponding to the start 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 th time point and the second time point.

2. The method of claim 1, wherein the dc voltage generator is a surge voltage generator.

The device for measuring the switch-on pre-breakdown time of switches is characterized in that the device 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;

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 th 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 th 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 th time point and the second time point is used as the 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 an th electro-optic transducer, a th optical fiber and a th electro-optic transducer.

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.

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 the closing pre-breakdown time of switches.

Background

With the development of an extra-high voltage transmission technology, the safety and reliability of an extra-high voltage transmission system are paid more and more attention, due to the complexity of a power grid system, the requirement on 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 determined by a closing test of a GIS (gas insulated switchgear) grounding switch in the prior , a capacitor tower is used for high-voltage discharge in the test, but the prior 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 closing voltage is high, the requirement on a test loop is high, the requirement on loop equipment is high, cost is high, and fixed test risks exist;

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 closing of switches, 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 methods for measuring the 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 th time point corresponding to the start 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 th time point and the second time point.

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.

, in order to realize the generation of the set voltage value simply and safely, the direct voltage generating device is an impulse voltage generator, the impulse voltage generator directly applies short-time voltage to the two ends of the grounding switch to be tested, 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 capacitance tower.

The invention provides a measuring device for switch closing 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 th 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 th 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 th time point and the second time point is used as the 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.

, in order to improve the safety of the test and the signal acquisition accuracy, the travel sensor is connected with the second input end of the processor through a electrical-to-optical converter, a optical fiber and a electrical-to-optical converter in sequence.

, in order to improve the safety and control accuracy of the test, the output end of the switching drive 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.

, in order to realize direct observation of the test result, the voltage sampling device and the travel sensor are also connected with an oscilloscope.

Further , the voltage sampling device is a resistor divider for simple voltage monitoring.

And , in order to realize the control of the grounding switch on-off simply and safely, the on-off driving device is a mechanical characteristic tester.

, in order to realize the generation of the set voltage value simply and safely, the direct voltage generating device is an impulse voltage generator, the impulse voltage generator directly applies short-time voltage to the two ends of the grounding switch to be tested, 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 capacitance tower.

Drawings

FIG. 1 is a schematic diagram of the method for measuring the closing pre-breakdown time of the GIS grounding switches according to the invention;

FIG. 2 is a schematic diagram of the device for measuring the closing pre-breakdown time of GIS grounding switches;

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 an th electro-optical converter, 6 is a th electro-optical converter, 7 is a processor, 8 is a second electro-optical converter, 9 is a second electro-optical converter, and 10 is a mechanical characteristic tester.

Detailed Description

The switch of the present invention is exemplified by a GIS grounding switch, and the present invention is further explained in detail in with reference to the accompanying drawings.

The method comprises the following steps:

the invention provides a method for measuring the closing pre-breakdown time of GIS grounding switches, 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 kinds of direct current voltage generating devices, can generate fixed voltage according to requirements, the set voltage value is larger than 100kV, and as other embodiments, the impulse voltage generator can be replaced by other existing voltage generators.

2) And acquiring a stroke signal before and after the grounding switch to be tested is switched on, and acquiring a th time point corresponding to the start 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 divider, resistance divider is kinds of 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 th time point and the second time point.

As shown in fig. 1, below the time t axis is a travel curve of the to-be-detected GIS grounding switch monitored by the travel sensor, and when a change of the travel signal is detected, the th time point corresponding to the change of the travel 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 divider₁Indicating settingsVoltage value at time point t of ₀Then, 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 GIS grounding switch closing pre-breakdown time measuring devices, which are device structures 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 property tester 10, wherein the positive pole and the negative pole of the surge voltage generator 1 are connected to two ends of a GIS grounding switch 3 to generate a short-time set voltage value, the resistance divider 2 is arranged in parallel at two ends of the GIS grounding switch 3 to detect the voltage at the two ends, the stroke sensor 4 is used for detecting the stroke of the GIS grounding switch 3 and collecting the stroke signal, wherein the surge voltage generator 1 is essentially dc voltage generating devices, can generate set voltage values according to requirements, and as other embodiments, the surge voltage generator 1 can be replaced by other existing voltage generators.

In this embodiment, the resistor divider 2 is used to detect voltage, and the resistor divider 2 is essentially voltage sampling devices, 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 electro-optical converter 8 to realize the control of the opening and closing operation of the GIS grounding switch 3. for the convenience of the opening and closing operation, the mechanical characteristic tester is used for the opening and closing operation of the grounding switch in the embodiment, the mechanical characteristic tester is essentially an opening and closing driving device, and as other embodiments, other devices capable of driving the opening and closing of the switch can be adopted.

The input end of the processor 7 is connected with the resistor voltage divider 2, the second input end of the processor 7 is connected with the stroke sensor 4 through the photoelectric converter 6, the optical fiber and the photoelectric converter 5, the processor 7 acquires the time point corresponding to the change of the stroke signal and the second time point corresponding to the voltage signal jump, and the time difference between the time point and the second time point is taken as the pre-breakdown time.

Apparatus example 2:

the invention provides measurement devices for the closing pre-breakdown time of a GIS grounding switch, which are based on the device embodiment 1 and are convenient for directly observing test results, and the measurement devices also comprise an oscilloscope, wherein the input end of the oscilloscope is connected with a resistor voltage divider 2, the second input end of the oscilloscope is connected with a stroke sensor 4, and voltage signals and stroke signals 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.