CN209690353U - Combined Arrester Leakage Current Measuring Device - Google Patents
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Abstract
本实用新型涉及避雷器检测技术领域，是一种组合式避雷器泄漏电流测量装置，其包括显示单元、用于测量试验主回路电流和非被试回路泄漏电流的电流电压检测单元、用于计算主回路电流和非被测回路泄漏电流差值的计算控制单元，电流电压检测单元上连接有四个输入端子，电流电压检测单元与计算控制单元连接，显示单元分别与电流电压检测单元和计算控制单元连接。本实用新型通过双通道电流采集，经转换电路、比较电路、减法电路计算得到试验电流。解决了现有直流参考电压及0.75倍直流参考电压下漏电流测量需要多个电流表计，接线复杂、易出错的问题，满足了现场测试要求，简化了试验接线，减少试验人员数据统计的工作量，提高了试验效率及精确度。
The utility model relates to the technical field of lightning arrester detection, which is a combined lightning arrester leakage current measurement device, which includes a display unit, a current and voltage detection unit for measuring the main circuit current of the test and the leakage current of the non-tested circuit, and a current and voltage detection unit for calculating the main circuit current. The calculation and control unit for the difference between the leakage current of the current and the non-tested circuit, the current and voltage detection unit is connected with four input terminals, the current and voltage detection unit is connected with the calculation and control unit, and the display unit is respectively connected with the current and voltage detection unit and the calculation and control unit . The utility model obtains the test current through dual-channel current acquisition and calculation through a conversion circuit, a comparison circuit and a subtraction circuit. It solves the problem that multiple ammeters are required for leakage current measurement under the current DC reference voltage and 0.75 times DC reference voltage, and the wiring is complicated and error-prone. It meets the requirements of on-site testing, simplifies the test wiring, and reduces the workload of test personnel for data statistics. , improve the test efficiency and accuracy.
Description
技术领域technical field
本实用新型涉及避雷器检测技术领域，是一种组合式避雷器泄漏电流测量装置。The utility model relates to the technical field of lightning arrester detection, which is a combined lightning arrester leakage current measuring device.
背景技术Background technique
避雷器是电力系统重要的电气设备之一，它对电力系统的安全运行起着重要作用。为了保证避雷器在电力系统中安全可靠运行，根据电力行业标准DL/T 596-2015《电力设备预防性试验规程》需要对避雷器进行预防性试验，其中现场检测直流参考电压及0.75倍直流参考电压下漏电流试验是判断避雷器是否正常的重要试验项目。Surge arrester is one of the important electrical equipment in power system, it plays an important role in the safe operation of power system. In order to ensure the safe and reliable operation of the arrester in the power system, according to the power industry standard DL/T 596-2015 "Preventive Test Procedures for Power Equipment", preventive tests on the arrester are required, in which the DC reference voltage and 0.75 times the DC reference voltage are detected on site The leakage current test is an important test item to judge whether the arrester is normal.
根据DL/T 474.5-2006《现场绝缘试验实施导则避雷器试验》中提供的关于直流参考电压及0.75倍直流参考电压试验方法，现场需要提供至少两个电流表，无疑会使现场试验接线复杂。一旦现场被试品数量较大，就会给试验人员带来大量的数据统计计算工作，增加试验人员的工作量，同时由于工作量大，易出错，对试验结果造成影响。According to the test method of DC reference voltage and 0.75 times DC reference voltage provided in DL/T 474.5-2006 "Guidelines for Implementation of On-site Insulation Test and Lightning Arrester Test", at least two ammeters need to be provided on site, which will undoubtedly complicate the wiring of the on-site test. Once the number of tested products on site is large, it will bring a lot of data statistics and calculation work to the test personnel, which will increase the workload of the test personnel. At the same time, due to the heavy workload and error-prone, it will affect the test results.
发明内容Contents of the invention
本实用新型提供了一种组合式避雷器泄漏电流测量装置，克服了上述现有技术之不足，其能有效解决现有避雷器漏电流测量装置存在的接线复杂、易出错的问题。The utility model provides a combined lightning arrester leakage current measurement device, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problems of complex wiring and error-prone existing in the existing lightning arrester leakage current measurement device.
本实用新型的技术方案是通过以下措施来实现的：一种组合式避雷器泄漏电流测量装置，包括显示单元、用于测量试验主回路电流和非被试回路泄漏电流的电流电压检测单元、用于计算主回路电流和非被测回路泄漏电流差值的计算控制单元，电流电压检测单元上连接有四个输入端子，分别为第一输入端子、第二输入端子、第三输入端子和第四输入端子，电流电压检测单元与计算控制单元连接，显示单元分别与电流电压检测单元和计算控制单元连接。The technical scheme of the utility model is realized by the following measures: a combined surge arrester leakage current measurement device, including a display unit, a current and voltage detection unit for measuring the main circuit current of the test and the leakage current of the non-test circuit, and a The calculation and control unit for calculating the difference between the main circuit current and the leakage current of the non-tested circuit. There are four input terminals connected to the current and voltage detection unit, which are the first input terminal, the second input terminal, the third input terminal and the fourth input terminal. terminal, the current and voltage detection unit is connected with the calculation control unit, and the display unit is respectively connected with the current and voltage detection unit and the calculation control unit.
下面是对上述实用新型技术方案的进一步优化或/和改进：Below is the further optimization or/and improvement to above-mentioned utility model technical scheme:
上述计算控制单元可包括比较电路和减法电路，电流电压检测单元分别与比较电路和减法电路连接，比较电路与减法电路连接。The calculation control unit may include a comparison circuit and a subtraction circuit, the current and voltage detection unit is respectively connected to the comparison circuit and the subtraction circuit, and the comparison circuit is connected to the subtraction circuit.
上述电流电压检测单元可包括测量试验主回路电流的第一电流电压检测电路和测量非被试回路泄漏电流的第二电流电压检测电路，第一输入端子和第二输入端子连接在第一电流电压检测电路上，第三输入端子和第四输入端子连接在第二电流电压检测电路上。The above-mentioned current and voltage detection unit may include a first current and voltage detection circuit for measuring the test main circuit current and a second current and voltage detection circuit for measuring the leakage current of the non-tested circuit, and the first input terminal and the second input terminal are connected at the first current and voltage On the detection circuit, the third input terminal and the fourth input terminal are connected to the second current and voltage detection circuit.
上述还可包括直流高电压发生单元，直流高电压发生单元与第一电流电压检测电路的一个输入端子连接。The foregoing may further include a DC high voltage generating unit connected to an input terminal of the first current and voltage detection circuit.
上述显示单元可包括模数转换电路和显示屏，电流电压检测单元和减法电路均与模数转换电路连接，模数转换电路与显示屏连接。The above display unit may include an analog-to-digital conversion circuit and a display screen, the current and voltage detection unit and the subtraction circuit are both connected to the analog-to-digital conversion circuit, and the analog-to-digital conversion circuit is connected to the display screen.
上述还可包括绝缘壳体，电流电压检测单元、比较电路、减法电路和模数转换电路均位于绝缘壳体内部，第一输入端子、第二输入端子、第三输入端子、第四输入端子和显示屏位于绝缘壳体上。The above may also include an insulating casing, the current and voltage detection unit, the comparison circuit, the subtraction circuit and the analog-to-digital conversion circuit are located inside the insulating casing, the first input terminal, the second input terminal, the third input terminal, the fourth input terminal and The display screen is located on the insulating housing.
本实用新型结构合理而紧凑，使用方便，提供了一种现场检测避雷器直流参考电压及0.75倍直流参考电压下漏电流的测量装置。通过双通道电流采集，经过转换电路、比较电路、减法电路计算得到试验电流。解决了现有直流参考电压及0.75倍直流参考电压下漏电流测量需要多个电流表计，接线复杂、工作量大、易出错的问题，在满足现场测试要求的情况下，简化了试验接线，减少试验人员数据统计的工作量，提高了试验效率及精确度。The utility model has a reasonable and compact structure and is convenient to use, and provides a measuring device for on-site detection of the DC reference voltage of the lightning arrester and the leakage current at 0.75 times the DC reference voltage. Through dual-channel current acquisition, the test current is calculated through conversion circuit, comparison circuit and subtraction circuit. It solves the problems of the existing DC reference voltage and 0.75 times DC reference voltage leakage current measurement requiring multiple ammeters, complex wiring, heavy workload, and error-prone problems. It simplifies the test wiring and reduces the The workload of the test personnel for data statistics improves the test efficiency and accuracy.
附图说明Description of drawings
附图1为本实用新型的电路结构示意图。Accompanying drawing 1 is the circuit structure diagram of the utility model.
附图2为附图1中比较电路的电路示意图。Accompanying drawing 2 is the circuit diagram of comparing circuit in accompanying drawing 1.
附图3为附图1中减法电路的电路示意图。Accompanying drawing 3 is the circuit schematic diagram of the subtraction circuit in accompanying drawing 1.
附图4为附图1中第一电流电压检测电路和第二电流电压检测电路的电路示意图。Accompanying drawing 4 is the schematic circuit diagram of the first current and voltage detection circuit and the second current and voltage detection circuit in Fig. 1 .
附图5为本实用新型测量被试避雷器上节避雷器的使用状态图。Accompanying drawing 5 is the use state diagram of the upper section lightning arrester of the utility model measurement tested lightning arrester.
附图中的编码分别为：1为第一输入端子，2为第二输入端子，3为第三输入端子，4为第四输入端子，9为上节避雷器，10为中节避雷器，11为下节避雷器。The codes in the drawings are: 1 is the first input terminal, 2 is the second input terminal, 3 is the third input terminal, 4 is the fourth input terminal, 9 is the upper section arrester, 10 is the middle section arrester, 11 is Arrester in the next section.
具体实施方式Detailed ways
本实用新型不受下述实施例的限制，可根据本实用新型的技术方案与实际情况来确定具体的实施方式。The utility model is not limited by the following examples, and the specific implementation manner can be determined according to the technical scheme of the utility model and actual conditions.
下面结合实施例及附图对本实用新型作进一步描述：Below in conjunction with embodiment and accompanying drawing, the utility model is further described:
如附图1所示，该组合式避雷器泄漏电流测量装置，包括显示单元、用于测量试验主回路电流和非被试回路泄漏电流的电流电压检测单元、用于计算主回路电流和非被测回路泄漏电流差值的计算控制单元，电流电压检测单元上连接有四个输入端子，分别为第一输入端子1、第二输入端子2、第三输入端子3和第四输入端子4，电流电压检测单元与计算控制单元连接，显示单元分别与电流电压检测单元和计算控制单元连接。As shown in Figure 1, the combined surge arrester leakage current measurement device includes a display unit, a current and voltage detection unit for measuring the main circuit current of the test and the leakage current of the non-tested circuit, and a current and voltage detection unit for calculating the main circuit current and the non-tested circuit current. The calculation and control unit of the loop leakage current difference has four input terminals connected to the current and voltage detection unit, which are respectively the first input terminal 1, the second input terminal 2, the third input terminal 3 and the fourth input terminal 4, and the current and voltage The detection unit is connected with the calculation control unit, and the display unit is respectively connected with the current and voltage detection unit and the calculation control unit.
上述电流电压检测单元上连接的四个输入端子组成两个电流检测输入端口，分别用于测量试验主回路电流I1和非被试回路泄漏电流I2。计算控制单元用于判断试验主回路电流I1是否大于非被试回路泄漏电流I2，即试验主回路电流I1是否先于非被试回路泄漏电流I2达到nmA，若是则计算试验主回路电流I1和非被试回路泄漏电流I2的差值，若不是则不计算差值。显示单元用于显示试验主回路电流I1、非被试回路泄漏电流I2、试验主回路电流I1和非被试回路泄漏电流I2的差值。The four input terminals connected to the above-mentioned current and voltage detection unit form two current detection input ports, which are respectively used to measure the test main loop current I 1 and the non-test loop leakage current I 2 . The calculation control unit is used to judge whether the test main circuit current I 1 is greater than the non-test circuit leakage current I 2 , that is, whether the test main circuit current I 1 reaches nmA before the non-test circuit leakage current I 2 , and if so, calculate the test main circuit The difference between the current I 1 and the leakage current I 2 of the non-test circuit, if not, do not calculate the difference. The display unit is used to display the test main circuit current I 1 , the non-test circuit leakage current I 2 , the difference between the test main circuit current I 1 and the non-test circuit leakage current I 2 .
本实用新型使用过程如下所示：The utility model using process is as follows:
1、将测量试验主回路电流I1的两个输入端子接入试验主回路中，即一个输入端子与直流高压发生器连接，另一个输入端子与避雷器被试部分的非接地端连接；将非被试回路泄漏电流I2的两个输入端子接入非被试回路，即一个输入端子与非被试部分下端连接，另一个输入端子接地；1. Connect the two input terminals for measuring the test main circuit current I 1 into the test main circuit, that is, one input terminal is connected to the DC high voltage generator, and the other input terminal is connected to the non-ground terminal of the tested part of the arrester; The two input terminals of the leakage current I2 of the tested circuit are connected to the non-tested circuit, that is, one input terminal is connected to the lower end of the non-tested part, and the other input terminal is grounded;
2、对照避雷器设备出厂试验报告，确定被试避雷器的泄漏电流n（单位mA）及该电流下的试验电压，将该电压值作为试验参考电压；2. According to the factory test report of the arrester equipment, determine the leakage current n (in mA) of the arrester under test and the test voltage under this current, and use this voltage value as the test reference voltage;
3、利用直流高压发生器进行加压，观察显示单元显示的I1、I2及二者的差值，待显示满足I1＞I2且I1-I2＝n时，停止加压，并记录此时直流高压发生器控制器显示的电压；3. Use a DC high-voltage generator to pressurize, observe the I 1 , I 2 displayed on the display unit and the difference between the two, and stop pressurizing when the display satisfies I 1 >I 2 and I 1 -I 2 =n. And record the voltage displayed by the DC high voltage generator controller at this time;
4、将其与出厂试验值对比，以此作为避雷器性能判断的依据。4. Compare it with the factory test value as the basis for judging the performance of the arrester.
本实用新型提供了一种现场检测避雷器直流参考电压及0.75倍直流参考电压下漏电流的测量装置。通过双通道电流采集，经过转换电路、比较电路、减法电路计算得到试验电流。解决了现有直流参考电压及0.75倍直流参考电压下漏电流测量需要多个电流表计，接线复杂、工作量大、易出错的问题，在满足现场测试要求的情况下，简化了试验接线，减少试验人员数据统计的工作量，提高了试验效率及精确度。The utility model provides a measuring device for on-site detection of a DC reference voltage of an arrester and a leakage current at 0.75 times the DC reference voltage. Through dual-channel current acquisition, the test current is calculated through conversion circuit, comparison circuit and subtraction circuit. It solves the problems of the existing DC reference voltage and 0.75 times the DC reference voltage leakage current measurement requiring multiple ammeters, complicated wiring, heavy workload, and error-prone problems. It simplifies the test wiring and reduces the The workload of the test personnel for data statistics improves the test efficiency and accuracy.
可根据实际需要，对上述组合式避雷器泄漏电流测量装置作进一步优化或/和改进：According to actual needs, the above combined surge arrester leakage current measurement device can be further optimized or/and improved:
如附图1、2、3所示，所述计算控制单元包括比较电路和减法电路，电流电压检测单元分别与比较电路和减法电路连接，比较电路与减法电路连接。As shown in accompanying drawings 1, 2 and 3, the calculation control unit includes a comparison circuit and a subtraction circuit, the current and voltage detection unit is respectively connected to the comparison circuit and the subtraction circuit, and the comparison circuit is connected to the subtraction circuit.
上述比较电路为现有公知技术，具体电路如图2所示，比较电路用于判断试验主回路电流I1是否大于非被试回路泄漏电流I2，若是，则比较电路输出高电平，使减法电路进行差值运算，若不是，则输出低电平，减法电路不进行差值运算；The above-mentioned comparison circuit is an existing known technology, and the specific circuit is as shown in Figure 2. The comparison circuit is used to judge whether the test main circuit current I 1 is greater than the non-test circuit leakage current I 2 , if so, the comparison circuit outputs a high level, so that The subtraction circuit performs a difference operation, if not, it outputs a low level, and the subtraction circuit does not perform a difference operation;
上述减法电路为现有公知技术，具体电路如图3所示，减法电路用于计算试验主回路电流I1和非被试回路泄漏电流I2的差值。The above-mentioned subtraction circuit is an existing known technology, and the specific circuit is shown in Figure 3. The subtraction circuit is used to calculate the difference between the main circuit current I1 of the test and the leakage current I2 of the non-tested circuit.
如附图1、4所示，所述电流电压检测单元包括测量试验主回路电流的第一电流电压检测电路和测量非被试回路泄漏电流的第二电流电压检测电路，第一输入端子1和第二输入端子2连接在第一电流电压检测电路上，第三输入端子3和第四输入端子4连接在第二电流电压检测电路上。As shown in accompanying drawings 1 and 4, the current and voltage detection unit includes a first current and voltage detection circuit for measuring the test main circuit current and a second current and voltage detection circuit for measuring the leakage current of the non-tested circuit, the first input terminal 1 and The second input terminal 2 is connected to the first current and voltage detection circuit, and the third input terminal 3 and the fourth input terminal 4 are connected to the second current and voltage detection circuit.
上述第一电流电压检测电路和第二电流电压检测电路均为现有公知技术，具体电路如图4所示，第一电流电压检测电路用于测量试验主回路电流I1，第二电流电压检测电路用于测量非被试回路泄漏电流I2。The above-mentioned first current and voltage detection circuit and the second current and voltage detection circuit are existing known technologies, and the specific circuit is shown in Figure 4. The first current and voltage detection circuit is used to measure the test main circuit current I 1 , and the second current and voltage detection circuit The circuit is used to measure the leakage current I 2 of the non-tested circuit.
使用本实用新型时，将第一输入端子1、第二输入端子2接入试验主回路中，第一输入端子1与直流高压发生器连接，第二输入端子2与避雷器被试部分的非接地端连接，将第三输入端子3、第四输入端子4接入非被试回路，第三输入端子3与非被试部分下端连接，第四输入端子4接地；When using the utility model, the first input terminal 1 and the second input terminal 2 are connected to the test main circuit, the first input terminal 1 is connected to the DC high voltage generator, and the second input terminal 2 is connected to the non-grounded part of the lightning arrester. The third input terminal 3 and the fourth input terminal 4 are connected to the non-test circuit, the third input terminal 3 is connected to the lower end of the non-test part, and the fourth input terminal 4 is grounded;
如图5所示，若测试被试避雷器的上节避雷器9泄漏电流，则将第一输入端子1与直流高压发生器连接，第二输入端子2连接在上节避雷器9和中节避雷器10之间，第三输入端子3与下节避雷器11的下端连接，第四输入端子4接地。As shown in Figure 5, if the leakage current of the upper arrester 9 of the tested arrester is tested, the first input terminal 1 is connected to the DC high voltage generator, and the second input terminal 2 is connected between the upper arrester 9 and the middle arrester 10 Between, the third input terminal 3 is connected to the lower end of the lightning arrester 11 in the lower section, and the fourth input terminal 4 is grounded.
如附图1、5所示，还包括直流高电压发生单元，直流高电压发生单元与第一电流电压检测电路的一个输入端子连接。As shown in Figures 1 and 5, it also includes a DC high voltage generating unit connected to an input terminal of the first current and voltage detection circuit.
上述直流高电压发生单元为现有公知技术，可为直流高电压发生器，用于加压。The above-mentioned DC high voltage generating unit is a known technology in the prior art, and can be a DC high voltage generator for pressurization.
如附图1所示，所述显示单元包括模数转换电路和显示屏，电流电压检测单元和减法电路均与模数转换电路连接，模数转换电路与显示屏连接。As shown in Figure 1, the display unit includes an analog-to-digital conversion circuit and a display screen, the current and voltage detection unit and the subtraction circuit are connected to the analog-to-digital conversion circuit, and the analog-to-digital conversion circuit is connected to the display screen.
如附图1所示，还包括绝缘壳体，电流电压检测单元、比较电路、减法电路和模数转换电路均位于绝缘壳体内部，第一输入端子1、第二输入端子2、第三输入端子3、第四输入端子4和显示屏位于绝缘壳体上。As shown in Figure 1, it also includes an insulating housing, the current and voltage detection unit, the comparison circuit, the subtraction circuit and the analog-to-digital conversion circuit are all located inside the insulating housing, the first input terminal 1, the second input terminal 2, the third input terminal The terminal 3, the fourth input terminal 4 and the display screen are located on the insulating casing.
以上技术特征构成了本实用新型的最佳实施例，其具有较强的适应性和最佳实施效果，可根据实际需要增减非必要的技术特征，来满足不同情况的需求。The above technical features constitute the best embodiment of the utility model, which has strong adaptability and best implementation effect, and non-essential technical features can be increased or decreased according to actual needs to meet the needs of different situations.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109324214A (en) * | 2018-11-22 | 2019-02-12 | 国网新疆电力有限公司电力科学研究院 | Combined arrester leakage current measuring device |
| CN114578126A (en) * | 2022-03-08 | 2022-06-03 | 广东电网有限责任公司 | Direct current leakage experiment device and method for multi-section lightning arrester |
| CN114993375A (en) * | 2022-04-15 | 2022-09-02 | 国网电力科学研究院武汉南瑞有限责任公司 | Lightning arrester automatic detection system and detection method |
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2018
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109324214A (en) * | 2018-11-22 | 2019-02-12 | 国网新疆电力有限公司电力科学研究院 | Combined arrester leakage current measuring device |
| CN114578126A (en) * | 2022-03-08 | 2022-06-03 | 广东电网有限责任公司 | Direct current leakage experiment device and method for multi-section lightning arrester |
| CN114993375A (en) * | 2022-04-15 | 2022-09-02 | 国网电力科学研究院武汉南瑞有限责任公司 | Lightning arrester automatic detection system and detection method |
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