CN201955433U - Induction withstand voltage tester for pure-capacitive electromagnetic voltage transformer - Google Patents
Induction withstand voltage tester for pure-capacitive electromagnetic voltage transformer Download PDFInfo
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Abstract
本实用新型涉及一种纯容性电磁式电压互感器感应耐压测试仪,包括变频电源、隔离变、补偿电感;将市电接入变频电源,变频电源将市电整流成直流,然后逆变,经过一系列的稳压控制,输出为0-150V频率可调的交流,变频电源输出变频交流到隔离变,隔离变调节输出电压量程,然后接到电磁式电压互感器的二次绕组a2x1上,电磁式电压互感器的二次绕组a1x1和a2x2串联起来,a1和x2短接,在a2x1上并联补偿电感做无功补偿,a3x3和a4x4也是串联,并电感补偿,在补偿电感的两侧放电压表,检测输出电压,在隔离变输出的高压尾端串电流表,检测仪器的输出电流;本实用新型方案携带的是固定电感,体积小,重量轻,减小损耗,节能资源、可以实现一机多用。
The utility model relates to a pure capacitive electromagnetic type voltage transformer induction withstand voltage tester, which includes a frequency conversion power supply, an isolation transformer, and a compensation inductance; the mains power is connected to the frequency conversion power supply, and the frequency conversion power supply rectifies the mains power into a direct current, and then inverts the power supply. , after a series of voltage stabilization control, the output is 0-150V frequency adjustable AC, the variable frequency power supply outputs variable frequency AC to the isolation transformer, the isolation transformer adjusts the output voltage range, and then connected to the secondary winding a2x1 of the electromagnetic voltage transformer , the secondary windings a1x1 and a2x2 of the electromagnetic voltage transformer are connected in series, a1 and x2 are short-circuited, and the compensation inductor is connected in parallel on a2x1 for reactive power compensation. A3x3 and a4x4 are also connected in series, and the inductance is compensated. The voltmeter detects the output voltage, and an ammeter is connected at the high-voltage tail end of the isolation transformer to detect the output current of the instrument; the utility model scheme carries a fixed inductance, which is small in size, light in weight, reduces loss, saves energy resources, and can realize a The machine is multi-purpose.
Description
技术领域technical field
本实用新型涉及一种电磁式电压互感器感应耐压测试仪,特别是一种纯容性电磁式电压互感器感应耐压测试仪,属于电气检测仪器技术领域。The utility model relates to an induction withstand voltage tester for an electromagnetic voltage transformer, in particular to a pure capacitive electromagnetic voltage transformer induction withstand voltage tester, which belongs to the technical field of electric detection instruments.
背景技术Background technique
电磁式电压互感器感应耐压测试仪的铁芯在工频额定电压时已接近饱和,再将励磁电压升到额定电压2倍以上的电压值,使铁芯饱和,空载电流会急剧增加,达到不能允许的程度,一般选择试验频率为150Hz左右;传统的三倍频频率是固定3个点,电磁式电压互感器感应耐压测试仪的弊端是:电感量不容易配置到最佳点,从而提高了仪器的功率和损耗,电磁式电压互感器感应耐压测试仪呈容性,试验时功率很大,有的要超过200A以上,要功率很大才能带的起来;根据以前做电磁式电压互感器试验得到的一些数据:The iron core of the electromagnetic voltage transformer induction withstand voltage tester is close to saturation at the power frequency rated voltage, and then the excitation voltage is raised to a voltage value that is more than twice the rated voltage to saturate the iron core, and the no-load current will increase sharply. To the extent that it cannot be allowed, the test frequency is generally selected to be about 150Hz; the traditional triple frequency frequency is fixed at 3 points. The disadvantage of the electromagnetic voltage transformer induction withstand voltage tester is that the inductance is not easy to configure to the optimal point. Thereby the power and loss of the instrument are improved. The electromagnetic voltage transformer induction withstand voltage tester is capacitive, and the power is very large during the test, some of which exceed 200A. Some data obtained from the voltage transformer test:
互感器二次绕组侧电压电流相位差测量是-87度左右(每一台都不一样),补偿电感回路电压电流相位差测量是83度。假设励磁曲线为线性关系,则施加正常试验电压时互感器二次绕组电流为92.56A,经询问厂家,在100A以内绕组可以承受,试验中必须严格监视此电流。加两组电感补偿其电流为32.14A。考虑功率因数的影响,则互感器二次侧的有功电流IP1=2*92.56*COS87A,无功电流IQ1=2*92.56*SIN87A;而补偿电抗的有功电流IP2=2*32.14*COS83A,无功电流IQ2=2*32.14*SIN83A。则流过隔离变高压绕组的电流大小:The voltage and current phase difference measurement on the secondary winding side of the transformer is about -87 degrees (each one is different), and the voltage and current phase difference measurement of the compensation inductance loop is 83 degrees. Assuming that the excitation curve is a linear relationship, the secondary winding current of the transformer is 92.56A when the normal test voltage is applied. After consulting the manufacturer, the winding can withstand within 100A, and this current must be strictly monitored during the test. Add two sets of inductors to compensate the current to 32.14A. Considering the influence of power factor, the active current IP1=2*92.56*COS87A on the secondary side of the transformer, the reactive current IQ1=2*92.56*SIN87A; and the active current IP2 of the compensation reactance=2*32.14*COS83A, the reactive Current IQ2=2*32.14*SIN83A. Then the current flowing through the isolation transformer high voltage winding:
I=9.68+7.84+J(184.86-63.8)=122.32A,I=9.68+7.84+J(184.86-63.8)=122.32A,
结论:因为电抗补偿不够导致隔离变和变频源容量不够而无法完成此台电压互感器的感应耐压试验。这时要增加补偿电感提高无功补偿,估算要再配三组电感。当然可以带上调节电感,对于这么大的电流,调节电感笨重,不容易携带,而且噪声很大。补偿肯定有误差,不容易补到最好,这样会增加仪器的输出功率。Conclusion: The induction withstand voltage test of this voltage transformer cannot be completed due to insufficient reactance compensation, which leads to insufficient capacity of the isolation variable and variable frequency sources. At this time, it is necessary to increase the compensation inductance to improve reactive power compensation, and it is estimated that three sets of inductances should be equipped. Of course, you can bring an adjustable inductor. For such a large current, the adjustable inductor is bulky, not easy to carry, and has a lot of noise. There must be errors in compensation, and it is not easy to make up to the best, which will increase the output power of the instrument.
实用新型内容Utility model content
本实用新型目的是为了克服现有技术的不足而提出了一种纯容性电磁式电压互感器感应耐压测试仪。The purpose of the utility model is to propose a pure capacitive electromagnetic voltage transformer induction withstand voltage tester in order to overcome the deficiencies of the prior art.
为达到上述目的,本实用新型采用的技术方案是:一种纯容性电磁式电压互感器感应耐压测试仪,包括变频电源、隔离变、补偿电感;将市电接入变频电源,变频电源将市电整流成直流,然后逆变,经过一系列的稳压控制,输出为0-150V频率可调的交流,变频电源输出变频交流到隔离变,隔离变调节输出电压量程,然后接到电磁式电压互感器的二次绕组a2 x1上,电磁式电压互感器的二次绕组a1x1和a2x2串联起来,a1和x2短接,在a2x1上并联补偿电感做无功补偿,a3x3和a4x4也是串联,并电感补偿,在补偿电感的两侧放电压表,检测输出电压,在隔离变输出的高压尾端串电流表,检测仪器的输出电流。In order to achieve the above purpose, the technical solution adopted by the utility model is: a purely capacitive electromagnetic voltage transformer induction withstand voltage tester, including a frequency conversion power supply, an isolation transformer, and a compensation inductance; The mains power is rectified into DC, and then inverted. After a series of voltage stabilization control, the output is 0-150V frequency adjustable AC. The variable frequency power supply outputs variable frequency AC to the isolation transformer. The isolation transformer adjusts the output voltage range, and then connects to the electromagnetic On the secondary winding a2 x1 of the type voltage transformer, the secondary winding a1x1 and a2x2 of the electromagnetic voltage transformer are connected in series, a1 and x2 are short-circuited, and the compensation inductor is connected in parallel on a2x1 for reactive power compensation, and a3x3 and a4x4 are also connected in series. And inductance compensation, place a voltmeter on both sides of the compensation inductance to detect the output voltage, and connect an ammeter to the high-voltage end of the isolation transformer output to detect the output current of the instrument.
由于上述技术方案的运用,本实用新型与现有技术相比具有下列优点:Due to the application of the above-mentioned technical solution, the utility model has the following advantages compared with the prior art:
本实用新型的纯容性电磁式电压互感器感应耐压测试仪,采用微机控制,运用数字波形合成技术及现代电力电子技术设计制造,比传统的三倍频发生器工作效率高,输出电压稳定,测量精度高,重复性好。并且可以自动测试,测试伏安特性并直接画出伏安特性曲线。纯容性电磁式电压互感器感应耐压测试仪还具有隔离、短路、过流、过压、过热等保护功能;显示采用大屏幕背光式液晶显示器,全中文操控界面,带实时时钟功能,微型打印机;本方案携带的是固定电感,体积小,重量轻,另外电感量是多个规格,可以并联或串联使用,尽量的让无功补偿电流增大,减小纯容性电磁式电压互感器感应耐压测试仪的有功输出,补偿不到最好,这时可以调节频率,让其到达并联谐振点,让纯容性电磁式电压互感器感应耐压测试仪以最小的功率输出,减小损耗,节能资源;同时本方案比传统的电磁式电压互感器感应耐压测试仪功率大,测试仪一般是20KW、30KW,功能多,由于纯容性电磁式电压互感器感应耐压测试仪能输出45Hz~200Hz连续可调频率,0~500V的交流电压,所以除了用于电磁式电压互感器(PT)的感应耐压试验,还能在用于其它需要使用变频变压电源的试验场合使用;本方案还提供了电磁式电压互感器空载损耗测试,伏安特性测试功能等等,实现一机多用。The pure capacitive electromagnetic voltage transformer induction withstand voltage tester of the utility model is controlled by a microcomputer, designed and manufactured by using digital waveform synthesis technology and modern power electronic technology, and has higher working efficiency and stable output voltage than traditional triple frequency generators. , high measurement accuracy and good repeatability. And it can automatically test, test the volt-ampere characteristics and directly draw the volt-ampere characteristic curve. The pure capacitive electromagnetic voltage transformer induction withstand voltage tester also has protection functions such as isolation, short circuit, overcurrent, overvoltage, and overheating; Printer; this solution carries a fixed inductance, which is small in size and light in weight. In addition, the inductance has multiple specifications and can be used in parallel or in series. Try to increase the reactive power compensation current and reduce the pure capacitive electromagnetic voltage transformer. The active output of the induction withstand voltage tester cannot be compensated to the best. At this time, the frequency can be adjusted to reach the parallel resonance point, so that the pure capacitive electromagnetic voltage transformer induction withstand voltage tester can output with the minimum power, reducing Loss, energy-saving resources; at the same time, this solution is more powerful than the traditional electromagnetic voltage transformer induction withstand voltage tester, the tester is generally 20KW, 30KW, and has many functions. Output 45Hz~200Hz continuously adjustable frequency, 0~500V AC voltage, so in addition to being used for the induction withstand voltage test of electromagnetic voltage transformer (PT), it can also be used in other test occasions that need to use variable frequency and variable voltage power supply ; This program also provides electromagnetic voltage transformer no-load loss test, volt-ampere characteristic test functions, etc., to achieve a multi-purpose machine.
附图说明Description of drawings
下面结合附图对本实用新型技术方案作进一步说明:Below in conjunction with accompanying drawing, technical scheme of the utility model is further described:
图1为本实用新型的纯容性电磁式电压互感器感应耐压测试仪的工作原理图。Fig. 1 is a working principle diagram of a purely capacitive electromagnetic voltage transformer induction withstand voltage tester of the present invention.
具体实施方式Detailed ways
下面结合附图来说明本实用新型。The utility model is described below in conjunction with accompanying drawing.
如附图1所示为本实用新型所述的一种纯容性电磁式电压互感器感应耐压测试仪,包括变频电源、隔离变、补偿电感;将市电接入变频电源,变频电源将市电整流成直流,然后逆变,经过一系列的稳压控制,输出为0-150V频率可调的交流,变频电源输出变频交流到隔离变,隔离变调节输出电压量程,然后接到电磁式电压互感器的二次绕组a2x1上,电磁式电压互感器的二次绕组a1x1和a2x2串联起来,a1和x2短接,在a2x1上并联补偿电感做无功补偿,a3x3和a4x4也是串联,并电感补偿,在补偿电感的两侧放电压表,检测输出电压,在隔离变输出的高压尾端串电流表,检测仪器的输出电流。As shown in accompanying
对于纯容性电磁式电压互感器感应耐压测试仪,其电容量很大。纯容性电磁式电压互感器铁芯在工频额定电压时已接近饱和,再将励磁电压升到额定电压2倍以上的电压值,其电压互感器铁芯饱和,空载电流会急剧增加,达到不能允许的程度,一般选择试验频率为150Hz左右。在电感量估算配置差不多,然后进行频率的调节,找到其谐振点(无功补偿达到最大),让仪器以最小的功率输出,减小损耗,节能资源。For pure capacitive electromagnetic voltage transformer induction withstand voltage tester, its capacitance is very large. The iron core of the pure capacitive electromagnetic voltage transformer is close to saturation at the rated power frequency voltage, and then the excitation voltage is raised to a voltage value that is more than twice the rated voltage, and the iron core of the voltage transformer is saturated, and the no-load current will increase sharply. If it reaches an unacceptable level, the test frequency is generally selected to be around 150Hz. The inductance estimation configuration is almost the same, and then adjust the frequency to find its resonance point (reactive power compensation reaches the maximum), so that the instrument can output with the minimum power, reduce loss, and save resources.
由于上述技术方案的运用,本实用新型与现有技术相比具有下列优点:Due to the application of the above-mentioned technical solution, the utility model has the following advantages compared with the prior art:
本实用新型的纯容性电磁式电压互感器感应耐压测试仪,采用微机控制,运用数字波形合成技术及现代电力电子技术设计制造,比传统的三倍频发生器工作效率高,输出电压稳定,测量精度高,重复性好。并且可以自动测试,测试伏安特性并直接画出伏安特性曲线。纯容性电磁式电压互感器感应耐压测试仪还具有隔离、短路、过流、过压、过热等保护功能。显示采用大屏幕背光式液晶显示器,全中文操控界面,带实时时钟功能,微型打印机;本方案携带的是固定电感,体积小,重量轻,另外电感量是多个规格,可以并联或串联使用,尽量的让无功补偿电流增大,减小纯容性电磁式电压互感器感应耐压测试仪的有功输出,补偿不到最好,这时可以调节频率,让其到达并联谐振点,让纯容性电磁式电压互感器感应耐压测试仪以最小的功率输出,减小损耗,节能资源;同时本方案比传统的电磁式电压互感器感应耐压测试仪功率大,测试仪一般是20KW、30KW,功能多,由于纯容性电磁式电压互感器感应耐压测试仪能输出45Hz~200Hz连续可调频率,0~500V的交流电压,所以除了用于电磁式电压互感器(PT)的感应耐压试验,还能在用于其它需要使用变频变压电源的试验场合使用;本方案还提供了电磁式电压互感器空载损耗测试,伏安特性测试功能等等,实现一机多用。The pure capacitive electromagnetic voltage transformer induction withstand voltage tester of the utility model is controlled by a microcomputer, designed and manufactured by using digital waveform synthesis technology and modern power electronic technology, and has higher working efficiency and stable output voltage than traditional triple frequency generators. , high measurement accuracy and good repeatability. And it can automatically test, test the volt-ampere characteristics and directly draw the volt-ampere characteristic curve. The pure capacitive electromagnetic voltage transformer induction withstand voltage tester also has protection functions such as isolation, short circuit, overcurrent, overvoltage, and overheating. The display adopts a large-screen backlit liquid crystal display, a full Chinese control interface, a real-time clock function, and a micro-printer; this solution carries a fixed inductor, which is small in size and light in weight. In addition, the inductance has multiple specifications and can be used in parallel or in series. Try to increase the reactive power compensation current and reduce the active output of the pure capacitive electromagnetic voltage transformer induction withstand voltage tester. The capacitive electromagnetic voltage transformer induction withstand voltage tester uses the smallest power output, reduces loss, and saves resources; at the same time, this solution is more powerful than the traditional electromagnetic voltage transformer induction withstand voltage tester. The tester is generally 20KW, 30KW, multi-function, since the pure capacitive electromagnetic voltage transformer induction withstand voltage tester can output 45Hz ~ 200Hz continuously adjustable frequency, 0 ~ 500V AC voltage, so in addition to being used for induction of electromagnetic voltage transformer (PT) The withstand voltage test can also be used in other test occasions that need to use variable frequency and variable voltage power supplies; this program also provides electromagnetic voltage transformer no-load loss test, volt-ampere characteristic test functions, etc., to achieve a multi-purpose machine.
以上仅是本实用新型的具体应用范例,对本实用新型的保护范围不构成任何限制。凡采用等同变换或者等效替换而形成的技术方案,或任何对本实用新型中所述平板的移动方式,均落在本实用新型权利保护范围之内。The above are only specific application examples of the utility model, and do not constitute any limitation to the protection scope of the utility model. Any technical solution formed by equivalent transformation or equivalent replacement, or any method of moving the tablet described in the utility model, falls within the protection scope of the utility model.
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102437746A (en) * | 2011-11-22 | 2012-05-02 | 国网电力科学研究院 | Grading compensation power supply device for field calibration of ultra/extra-high voltage CVT |
CN102540022A (en) * | 2010-12-28 | 2012-07-04 | 苏州华电电气股份有限公司 | Pure capacitive electromagnetic type voltage transformer induction withstand voltage tester |
CN105277859A (en) * | 2015-11-12 | 2016-01-27 | 北京送变电公司 | Electromagnetic voltage transformer induced withstand voltage test system and method |
CN111337782A (en) * | 2020-04-03 | 2020-06-26 | 苏州华电电气股份有限公司 | Main transformer bias live monitoring system |
-
2010
- 2010-12-28 CN CN2010206853081U patent/CN201955433U/en not_active Expired - Fee Related
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102540022A (en) * | 2010-12-28 | 2012-07-04 | 苏州华电电气股份有限公司 | Pure capacitive electromagnetic type voltage transformer induction withstand voltage tester |
CN102437746A (en) * | 2011-11-22 | 2012-05-02 | 国网电力科学研究院 | Grading compensation power supply device for field calibration of ultra/extra-high voltage CVT |
CN102437746B (en) * | 2011-11-22 | 2013-12-18 | 国网电力科学研究院 | Grading compensation power supply device for field correction of ultra/extra high-voltage CVT (constant-voltage transformer) |
CN105277859A (en) * | 2015-11-12 | 2016-01-27 | 北京送变电公司 | Electromagnetic voltage transformer induced withstand voltage test system and method |
CN111337782A (en) * | 2020-04-03 | 2020-06-26 | 苏州华电电气股份有限公司 | Main transformer bias live monitoring system |
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