CN105974290B - A kind of dry-type air-core reactor turn-to-turn insulation performance detecting system and method - Google Patents
A kind of dry-type air-core reactor turn-to-turn insulation performance detecting system and method Download PDFInfo
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Abstract
本发明公开了一种干式空心电抗器匝间绝缘性能检测系统及方法，包括高压开关柜、变频试验电源、试验变压器、无功功率补偿单元、局部放电监测单元和被试品单元，所述高压开关柜接入380V三相交流电流，所述高压开关柜、变频试验电源、试验变压器、无功功率补偿单元、局部放电监测单元、被试品单元依次连接；所述局部放电监测单元包括耦合电容、测量阻抗和局部放电测试仪，所述被测品单元包括干式空心电抗器和交流电压测量单元，所述干式空心电抗器和交流电压测量单元并联；所述试验变压器激发谐振回路，通过变频试验电源输出频率使得回路中的无功功率补偿单元与被试品单元产生并联谐振。本发明能够对35千伏干式空心电抗器现场进行感应耐压试验，完成现场对电抗器的升压操作。
The invention discloses a dry-type air-core reactor turn-to-turn insulation performance detection system and method, including a high-voltage switch cabinet, a frequency conversion test power supply, a test transformer, a reactive power compensation unit, a partial discharge monitoring unit, and a tested product unit. The high-voltage switchgear is connected to 380V three-phase AC current, and the high-voltage switchgear, frequency conversion test power supply, test transformer, reactive power compensation unit, partial discharge monitoring unit, and tested unit are connected in sequence; the partial discharge monitoring unit includes a coupling Capacitance, measurement impedance and partial discharge tester, the unit under test includes a dry-type air-core reactor and an AC voltage measurement unit, and the dry-type air-core reactor and the AC voltage measurement unit are connected in parallel; the test transformer excites the resonant circuit, The reactive power compensation unit in the loop and the unit under test produce parallel resonance through frequency conversion of the output frequency of the test power supply. The invention can carry out the inductive voltage withstand test on the 35 kV dry-type air-core reactor on site, and complete the boost operation of the reactor on site.
Description
技术领域technical field
本发明涉及干式空心电抗器技术领域，具体涉及一种干式空心电抗器匝间绝缘性能检测系统及方法。The invention relates to the technical field of dry-type air-core reactors, in particular to a system and method for detecting inter-turn insulation performance of dry-type air-core reactors.
背景技术Background technique
随着我国电力事业的不断发展，对于如何提高供电质量和供电可靠性，已经成为供电系统需要考虑的重要问题。无功补偿装置在提高供电质量方面起着重要作用，在近几年得到了迅速发展；而为保证供电可靠性，保证变压器免受短路电流冲击，短路电流限制装置也得到广泛应用。With the continuous development of my country's electric power industry, how to improve the quality and reliability of power supply has become an important issue that needs to be considered by the power supply system. Reactive power compensation devices play an important role in improving the quality of power supply and have been developed rapidly in recent years; and in order to ensure the reliability of power supply and protect transformers from short-circuit current impact, short-circuit current limiting devices are also widely used.
干式空心电抗器作为无功补偿装置和短路电流限制装置中的代表性设备，由于其具有损耗小、噪音低、维护工作量小、不易发生相间短路故障、电抗值线性度好、设计寿命长等优点,近年来广泛应用于国内外电网设备中。电力系统采取的电抗器常见的有并联电抗器和串联电抗器。并联电抗器用来吸收线路的容性无功，起到改善电力系统无功功率的作用；串联电抗器则主要用来限制短路电流，或者通过与电容器串联或并联来限制电网中的高次谐波。As a representative device in reactive power compensation device and short-circuit current limiting device, dry-type air-core reactor has the advantages of low loss, low noise, small maintenance workload, less prone to phase-to-phase short-circuit faults, good linearity of reactance value, and long design life. In recent years, it has been widely used in power grid equipment at home and abroad. Common reactors used in power systems include shunt reactors and series reactors. The shunt reactor is used to absorb the capacitive reactive power of the line to improve the reactive power of the power system; the series reactor is mainly used to limit the short-circuit current, or limit the higher harmonics in the power grid by connecting in series or parallel with the capacitor .
随着干式空心电抗器在电网中的大规模应用，由于电抗器的各种缺陷引发的事故也不可避免的发生，在对电抗器缺陷统计中发现由于匝间绝缘引发的短路故障在各种缺陷中所占比例最高，接近一半。多数电抗器故障为匝间短路引起电抗器起火燃烧，给电力系统的安全稳定运行带来了很大影响。With the large-scale application of dry-type air-core reactors in power grids, accidents caused by various defects of reactors will inevitably occur. In the statistics of reactor defects, it is found that short-circuit faults caused by inter-turn insulation occur in various Defects accounted for the highest proportion, close to half. Most of the reactor faults are caused by inter-turn short circuit, which causes the reactor to catch fire and burn, which has a great impact on the safe and stable operation of the power system.
针对干式空心电抗器匝间绝缘的检测试验研究，国内学者的研究方法大体上可分为以下几种：一种是感应耐压试验法，该方法对电抗器首尾端直接施加工频电压，与电抗器实际运行状况最为接近，可有效考核电抗器匝间绝缘耐受过电压的能力，但该方法所需无功功率很大，很难有试验装置能满足试验时的容量要求，从而使此方法受到极大限制。一种是雷电冲击电压试验法，由于感应耐压试验方法的局限性，该方法被替代用作考核电抗器匝间绝缘的耐受能力，但是该方法作用时间比较短，能量较低，外观检查难辨别，且匝间短路引起的电参数变化量小，从雷电冲击波形也难以辨别。For the test research on the inter-turn insulation of dry-type air-core reactors, the research methods of domestic scholars can be roughly divided into the following types: one is the induction withstand voltage test method, which directly applies power frequency voltage to the first and last ends of the reactor, It is the closest to the actual operating condition of the reactor, and can effectively assess the ability of the reactor inter-turn insulation to withstand overvoltage, but the reactive power required by this method is very large, and it is difficult to have a test device that can meet the capacity requirements of the test, so that This method is extremely limited. One is the lightning impulse voltage test method. Due to the limitations of the induction withstand voltage test method, this method is used instead to assess the withstand capacity of the inter-turn insulation of the reactor. However, this method has a relatively short action time and low energy. It is difficult to distinguish, and the change of electrical parameters caused by inter-turn short circuit is small, and it is also difficult to distinguish from the lightning impulse waveform.
还有一种是高频脉冲振荡法，该方法的研究基于电抗器在匝间绝缘出现击穿短路时电抗器参数变化现象，在电抗器上施加高频电压，对比正常电抗器和故障电抗器对施加电压呈现不同的衰减常数，从而判断电抗器的匝间绝缘状态，该方法仅对已经出现匝间绝缘缺陷的电抗器有效果，而对存在匝间绝缘隐患而又未发生绝缘击穿的电抗器则无法实现检测功能。公开号为CN105445630的一种干式空心电抗器匝间绝缘测试装置，包括输入模块、干式空心电抗器、监测电路、MCU系统、过流保护电路、总线模块、显示模块、信号转换开关、数/转换电路、输入操作模块；监测电路包括电压监测电路、无功电流监测电路、有功电流监测电路、功率因素监测电路，输入模块包括调压器、高压脉冲电路、高频振荡电路，干式空心电抗器输入端连接高频振荡电路，输出端连接无功电流监测电路、有功电流监测电路、功率因素监测电路。There is also a high-frequency pulse oscillation method. The research of this method is based on the reactor parameter change phenomenon when the inter-turn insulation breaks down and short-circuits. A high-frequency voltage is applied to the reactor, and the normal reactor and the fault reactor are compared. The applied voltage presents different attenuation constants, so as to judge the inter-turn insulation state of the reactor. This method is only effective for reactors with inter-turn insulation defects, but for reactors with inter-turn insulation hazards but no insulation breakdown. The device cannot realize the detection function. A dry-type air-core reactor turn-to-turn insulation testing device with a publication number of CN105445630 includes an input module, a dry-type air-core reactor, a monitoring circuit, an MCU system, an overcurrent protection circuit, a bus module, a display module, a signal conversion switch, a digital / conversion circuit, input operation module; monitoring circuit includes voltage monitoring circuit, reactive current monitoring circuit, active current monitoring circuit, power factor monitoring circuit, input module includes voltage regulator, high voltage pulse circuit, high frequency oscillation circuit, dry hollow The input end of the reactor is connected to a high-frequency oscillation circuit, and the output end is connected to a reactive current monitoring circuit, an active current monitoring circuit, and a power factor monitoring circuit.
因此，对不同使用条件下的干式空心电抗器匝间绝缘进行试验研究，实现干式空心电抗器匝间绝缘的现场检测，就显得愈发重要。Therefore, it is more and more important to conduct experimental research on the inter-turn insulation of dry-type air-core reactors under different operating conditions, and to realize on-site detection of inter-turn insulation of dry-type air-core reactors.
发明内容Contents of the invention
有鉴于此，本发明的目的是针对现有技术的不足，提供一种干式空心电抗器匝间绝缘性能检测系统及方法，能够对35千伏干式空心电抗器现场进行感应耐压试验，完成现场对电抗器的升压操作。In view of this, the purpose of the present invention is to address the deficiencies in the prior art, to provide a dry-type air-core reactor turn-to-turn insulation performance detection system and method, which can conduct induction withstand voltage tests on 35 kV dry-type air-core reactors on site, Complete the on-site boosting operation of the reactor.
为解决上述技术问题，本发明所采取的技术方案如下：In order to solve the problems of the technologies described above, the technical scheme adopted in the present invention is as follows:
一种干式空心电抗器匝间绝缘性能检测系统，其中，包括高压开关柜、变频试验电源、试验变压器、无功功率补偿单元、局部放电监测单元和被试品单元，所述高压开关柜接入380V三相交流电流，所述高压开关柜、变频试验电源、试验变压器、无功功率补偿单元、局部放电监测单元、被试品单元依次连接；所述局部放电监测单元包括耦合电容、测量阻抗和局部放电测试仪，所述被试品单元包括干式空心电抗器和交流电压测量单元，所述干式空心电抗器和交流电压测量单元并联；所述试验变压器激发谐振回路，通过变频试验电源输出频率使得回路中的无功功率补偿单元与被试品单元产生并联谐振。A dry-type air-core reactor turn-to-turn insulation performance detection system, which includes a high-voltage switchgear, a frequency conversion test power supply, a test transformer, a reactive power compensation unit, a partial discharge monitoring unit, and a unit under test. The high-voltage switchgear is connected to Input 380V three-phase AC current, the high-voltage switchgear, frequency conversion test power supply, test transformer, reactive power compensation unit, partial discharge monitoring unit, and the unit under test are connected in sequence; the partial discharge monitoring unit includes coupling capacitors, measuring impedance and a partial discharge tester, the tested unit includes a dry-type air-core reactor and an AC voltage measurement unit, and the dry-type air-core reactor and the AC voltage measurement unit are connected in parallel; The output frequency makes the reactive power compensation unit in the loop and the unit under test produce parallel resonance.
优选的，所述试验变压器的高压回路中串联电流表。Preferably, an ammeter is connected in series in the high-voltage circuit of the test transformer.
优选的，所述无功功率补偿单元采用油浸式密集型补偿电容器组。Preferably, the reactive power compensation unit adopts an oil-immersed dense compensation capacitor bank.
优选的，：所述无功功率补偿单元由多个电容器组串联组成，所述的电容器组由多支电容器并联组成。Preferably, the reactive power compensation unit is composed of multiple capacitor banks connected in series, and the capacitor bank is composed of multiple capacitors connected in parallel.
优选的，所述试验变压器为励磁变压器。Preferably, the test transformer is an excitation transformer.
一种干式空心电抗器匝间绝缘性能检测方法，其中，包括如下步骤：A method for detecting the turn-to-turn insulation performance of a dry-type air-core reactor, comprising the following steps:
1)根据现场设备参数进行计算，选择无功补偿装置投切数量，通过干式空心电抗器参数计算出现场试验电压值U，按照1.3倍的额定电压水平计算，即U＝UL*1.3，UL代表干式空心电抗器额定工作电压；1) Calculate according to the field equipment parameters, select the switching quantity of the reactive power compensation device, and calculate the field test voltage value U through the parameters of the dry-type air-core reactor, and calculate according to the rated voltage level of 1.3 times, that is, U=U L *1.3, U L represents the rated working voltage of the dry-type air-core reactor;
2)根据变频试验电源额定输出电压频率范围，考虑完全补偿的情况下，选择无功功率补偿单元电容量：2) According to the frequency range of the rated output voltage of the frequency conversion test power supply and considering the complete compensation, select the capacitance of the reactive power compensation unit:
其中，C：补偿电容器电容量；L：被试空心电抗器电感值；f：试验频率；Among them, C: capacitance of compensation capacitor; L: inductance value of tested air-core reactor; f: test frequency;
3)对试验电压下流过补偿电容器组的电流IC进行计算：3) Calculate the current I C flowing through the compensation capacitor bank under the test voltage:
其中，Ic：补偿电容器电流；U：试验电压值；W：角频率；Among them, Ic: compensation capacitor current; U: test voltage value; W: angular frequency;
4)对流过试验变压器的电流I2进行计算：4) Calculate the current I 2 flowing through the test transformer:
其中，I2：试验变压器电流；IL：被试干式空心电抗器电流；Ic：补偿电容器电流；U：试验电压值；f：试验频率；Among them, I 2 : test transformer current; I L : tested dry-type air-core reactor current; Ic: compensation capacitor current; U: test voltage value; f: test frequency;
5)对电流IC、I2的数值进行分析，并联补偿电容器和试验变压器的技术参数是否满足要求；5) Analyze the values of current I C and I 2 , and check whether the technical parameters of parallel compensation capacitors and test transformers meet the requirements;
6)计算预演完毕，连接现场设备，进行干式空心电抗器的匝间绝缘性能考核试验。6) After the calculation and rehearsal is completed, the on-site equipment is connected, and the inter-turn insulation performance assessment test of the dry-type air-core reactor is carried out.
优选的，所述步骤6)包括如下步骤：Preferably, said step 6) comprises the steps of:
按照计算数据及被试品参数选择合适的补偿电容器组，并连接整个试验加压回路；Select the appropriate compensation capacitor bank according to the calculated data and the parameters of the tested product, and connect the entire test pressurization circuit;
在耦合电容器上连接检测阻抗、局部放电检测信号电缆以及局部放电检测仪；Connect the detection impedance, partial discharge detection signal cable and partial discharge detector to the coupling capacitor;
按照方波校准程序，利用校验方波装置在干式空心电抗器匝间绝缘性能检测系统上进行500pC的方波校准，并观察背景噪声；According to the square wave calibration procedure, use the calibration square wave device to perform 500pC square wave calibration on the dry-type air-core reactor turn-to-turn insulation performance testing system, and observe the background noise;
合上电源开关，缓慢进行电压升高，同时监测电流值并与计算结果进行对比；Close the power switch, slowly increase the voltage, and monitor the current value at the same time and compare it with the calculation result;
试验结束后，直接将电压将至0V，并切断电源。After the test, directly reduce the voltage to 0V and cut off the power supply.
优选的，所述缓慢进行电压升高，包括：Preferably, said slowly increasing the voltage includes:
首先升压至0.5倍U，观察局部放电量并持续1分钟，无异常则继续升压至0.8倍U，观察局部放电量并持续1分钟，无异常则直接升压至U，并持续1分钟记录局部放电量。First increase the voltage to 0.5 times U, observe the partial discharge and last for 1 minute, if there is no abnormality, continue to increase the voltage to 0.8 times U, observe the partial discharge and continue for 1 minute, if there is no abnormality, directly increase the voltage to U, and continue for 1 minute Record the amount of partial discharge.
本发明的有益效果是：The beneficial effects of the present invention are:
1)本发明能够对干式空心电抗器现场进行感应耐压试验，完成现场对电抗器匝间绝缘的考核；1) The present invention can carry out the induction withstand voltage test on the dry-type air-core reactor on site, and complete the on-site assessment of the inter-turn insulation of the reactor;
2)本发明所需升压试验变压器额定电压低，降低了试验变压器的制造难度；2) The rated voltage of the step-up test transformer required by the present invention is low, which reduces the manufacturing difficulty of the test transformer;
3)本发明自带局部放电监测单元，可以对试验过程中局部放电情况进行测量。3) The present invention has its own partial discharge monitoring unit, which can measure the partial discharge during the test.
4)本发明自带无功补偿电容器，所需有功电源容量小，可以实现现场试验的要求。4) The present invention has its own reactive power compensation capacitor, and the required active power supply capacity is small, which can meet the requirements of field tests.
5)本发明的方法清晰，突破了传统干式空心电抗器无法在现场进行匝间绝缘有效的瓶颈，使干式空心电抗器现场进行感应耐压成为可能，同时在试验过程中对局部放电量水平进行监测，填补了国内现场考核干式空心电抗器匝间绝缘性能的空白，有效干式空心电抗器的安全运行。5) The method of the present invention is clear and breaks through the bottleneck that traditional dry-type air-core reactors cannot perform effective inter-turn insulation on site, making it possible to perform induction withstand voltage on-site for dry-type air-core reactors, and at the same time, during the test process, the partial discharge The level of monitoring has filled the blank of the domestic on-site assessment of the inter-turn insulation performance of dry-type air-core reactors, and the safe operation of effective dry-type air-core reactors.
附图说明Description of drawings
图1是本发明干式空心电抗器匝间绝缘性能检测系统的原理框图。Fig. 1 is a functional block diagram of the inter-turn insulation performance detection system of the dry-type air-core reactor of the present invention.
图2是本发明干式空心电抗器匝间绝缘性能检测系统局部放电监测单元的电路原理图。Fig. 2 is a schematic circuit diagram of a partial discharge monitoring unit of a dry-type air-core reactor turn-to-turn insulation performance testing system of the present invention.
图3是本发明干式空心电抗器匝间绝缘性能检测方法的流程图。Fig. 3 is a flow chart of the method for detecting the inter-turn insulation performance of a dry-type air-core reactor according to the present invention.
具体实施方式Detailed ways
下面结合附图对发明技术方案进一步说明：Below in conjunction with accompanying drawing, technical scheme of the invention is further described:
实施例一:Embodiment one:
如图1所示，本发明包括高压开关柜1、变频试验电源2、励磁变压器3、无功功率补偿单元4、局部放电监测单元5和被试品单元6，高压开关柜1接入380V三相交流电流，高压开关柜1、变频试验电源2与励磁变压器3依次电连接，励磁变压器3将变频试验电源2的输出电压U1升压为U2，励磁变压器3的高压回路中串联电流表。局部放电监测单元5由耦合电容器CK、检测阻抗ZM和局放测试仪M组成。无功功率补偿单元4由3个相同的电容器组C1～C3组成，其中，电容器组C1-C3均由三支电容器并联而成，这三组电容器组并联在一起用以增加无功补偿的容量。被试品单元6包括干式空心电抗器和交流电压测量单元，所述干式空心电抗器和交流电压测量单元并联。As shown in Figure 1, the present invention includes a high-voltage switchgear 1, a variable frequency test power supply 2, an excitation transformer 3, a reactive power compensation unit 4, a partial discharge monitoring unit 5, and a tested product unit 6. The high-voltage switchgear 1 is connected to a 380V three Phase alternating current, high-voltage switchgear 1, frequency conversion test power supply 2 and excitation transformer 3 are electrically connected in sequence. The excitation transformer 3 boosts the output voltage U 1 of the frequency conversion test power supply 2 to U 2 . The partial discharge monitoring unit 5 is composed of a coupling capacitor C K , a detection impedance Z M and a partial discharge tester M. The reactive power compensation unit 4 is composed of three identical capacitor banks C1-C3, among which, the capacitor banks C1-C3 are formed by three capacitors connected in parallel, and these three capacitor banks are connected in parallel to increase the capacity of reactive power compensation . The unit under test 6 includes a dry-type air-core reactor and an AC voltage measurement unit, and the dry-type air-core reactor and the AC voltage measurement unit are connected in parallel.
励磁变压器3激发谐振回路，通过变频试验电源2输出频率使得回路中的无功功率补偿单元4与被试品单元6产生并联谐振，实现无功功率的完全补偿。高压开关柜1对励磁变压器3起到保护的作用，防止电流过大损坏设备。局部放电监测单元5通过耦合电容器CK、检测阻抗ZM和局放测试仪M，利用脉冲电流法的原理，对整个加压系统的局部放电水平进行监测和考核。The excitation transformer 3 excites the resonant circuit, and the reactive power compensation unit 4 in the circuit and the unit under test 6 generate parallel resonance through the output frequency of the test power supply 2 to realize the complete compensation of reactive power. The high-voltage switchgear 1 protects the excitation transformer 3 and prevents equipment from being damaged by excessive current. The partial discharge monitoring unit 5 monitors and evaluates the partial discharge level of the entire pressurized system by using the principle of the pulse current method through the coupling capacitor C K , the detection impedance Z M and the partial discharge tester M.
本发明在试验时通过励磁变压器3将变频试验电源2的输出电压升到合适的电压值，以激发整个试验回路，动态调节变频试验电源2的输出频率和无功功率补偿单元4的电容器组投切组数，使无功功率补偿单元和被测电抗器在变频试验电源频率范围内(30Hz-300Hz)实现并联谐振，从而实现无功功率的完全补偿，此时变频试验电源2的输出频率即为试验频率，被试品6所加电压即为谐振电压。根据并联谐振原理，该试验系统利用高压电抗器和和补偿电容器谐振产生高电压和大电流，电源仅需提供系统中有功消耗的部分，所需的电源容量大幅减小，实验设备的体积和重量也大幅减小。并且试验系统中引入脉冲电流法的局部放电监测单元，从而实现了对整个试验回路，特别是被试品6局部放电水平的检测和考核。In the test, the present invention raises the output voltage of the variable frequency test power supply 2 to a suitable voltage value through the excitation transformer 3 to excite the entire test circuit, and dynamically adjusts the output frequency of the variable frequency test power supply 2 and the capacitor bank input of the reactive power compensation unit 4. Cut the number of groups, so that the reactive power compensation unit and the reactor under test can achieve parallel resonance within the frequency range of the variable frequency test power supply (30Hz-300Hz), thereby realizing complete compensation of reactive power. At this time, the output frequency of the variable frequency test power supply 2 is is the test frequency, and the voltage applied to the tested product 6 is the resonant voltage. According to the principle of parallel resonance, the test system uses high-voltage reactors and compensation capacitors to resonate to generate high voltage and high current. The power supply only needs to provide the part of active power consumption in the system, and the required power supply capacity is greatly reduced. The volume and weight of the experimental equipment also significantly reduced. And the partial discharge monitoring unit of the pulse current method is introduced into the test system, so as to realize the detection and assessment of the partial discharge level of the entire test circuit, especially the tested product 6.
实施例二Embodiment two
如图3所示，本实施例提供了一种干式空心电抗器匝间绝缘性能检测方法，包括如下步骤：As shown in Figure 3, this embodiment provides a method for detecting the inter-turn insulation performance of a dry-type air-core reactor, including the following steps:
1)根据现场设备参数进行计算，选择无功补偿装置投切数量，通过干式空心电抗器参数计算出现场试验电压值U，按照1.3倍的额定电压水平计算，即U＝UL*1.3，UL代表干式空心电抗器额定工作电压；1) Calculate according to the field equipment parameters, select the switching quantity of the reactive power compensation device, and calculate the field test voltage value U through the parameters of the dry-type air-core reactor, and calculate according to the rated voltage level of 1.3 times, that is, U=U L *1.3, U L represents the rated working voltage of the dry-type air-core reactor;
2)根据变频试验电源额定输出电压频率范围，考虑完全补偿的情况下，选择无功功率补偿单元电容量：2) According to the frequency range of the rated output voltage of the frequency conversion test power supply and considering the complete compensation, select the capacitance of the reactive power compensation unit:
其中，C：补偿电容器电容量；L：被试空心电抗器电感值；f：试验频率；Among them, C: capacitance of compensation capacitor; L: inductance value of tested air-core reactor; f: test frequency;
3)对试验电压下流过补偿电容器组的电流IC进行计算：3) Calculate the current I C flowing through the compensation capacitor bank under the test voltage:
其中，Ic：补偿电容器电流；U：试验电压值；W：角频率；Among them, Ic: compensation capacitor current; U: test voltage value; W: angular frequency;
4)对流过试验变压器的电流I2进行计算：4) Calculate the current I 2 flowing through the test transformer:
其中，I2：试验变压器电流；IL：被试干式空心电抗器电流；Ic：补偿电容器电流；U：试验电压值；f：试验频率；Among them, I 2 : test transformer current; I L : tested dry-type air-core reactor current; Ic: compensation capacitor current; U: test voltage value; f: test frequency;
5)对电流IC、I2的数值进行分析，并联补偿电容器和试验变压器的技术参数是否满足要求；若该技术参数不满足要求，则更换补偿电容器和试验变压器了；5) Analyze the values of current I C and I 2 to see if the technical parameters of parallel compensation capacitors and test transformers meet the requirements; if the technical parameters do not meet the requirements, replace the compensation capacitors and test transformers;
6)计算预演完毕，连接现场设备，进行干式空心电抗器的匝间绝缘性能考核试验。6) After the calculation and rehearsal is completed, the on-site equipment is connected, and the inter-turn insulation performance assessment test of the dry-type air-core reactor is carried out.
步骤6)包括如下步骤：Step 6) comprises the following steps:
步骤61)按照计算数据及被试品参数选择合适的补偿电容器组，并连接整个试验加压回路；Step 61) Select a suitable compensation capacitor bank according to the calculated data and the parameters of the tested product, and connect the entire test pressurization circuit;
步骤62)在耦合电容器上连接检测阻抗、局部放电检测信号电缆以及局部放电检测仪；Step 62) Connect the detection impedance, the partial discharge detection signal cable and the partial discharge detector to the coupling capacitor;
步骤63)按照方波校准程序，利用校验方波装置在干式空心电抗器匝间绝缘性能检测系统上进行500pC的方波校准，并观察背景噪声(尽量不大于200pC)；Step 63) According to the square wave calibration procedure, use the calibration square wave device to perform a 500pC square wave calibration on the dry-type air-core reactor turn-to-turn insulation performance detection system, and observe the background noise (try not to exceed 200pC);
步骤64)合上电源开关，缓慢进行电压升高，同时监测电流值并与计算结果进行对比；Step 64) Turn on the power switch, slowly increase the voltage, and simultaneously monitor the current value and compare it with the calculation result;
为了提高安全性，缓慢进行电压升高步骤包括：首先升压至0.5倍U，观察局部放电量并持续1分钟，无异常则继续升压至0.8倍U，观察局部放电量并持续1分钟，无异常则直接升压至U，并持续1分钟记录局部放电量；In order to improve safety, the steps of slowly increasing the voltage include: first boost the voltage to 0.5 times U, observe the partial discharge and last for 1 minute, if there is no abnormality, continue to increase the voltage to 0.8 times U, observe the partial discharge and last for 1 minute, If there is no abnormality, directly increase the voltage to U, and record the partial discharge for 1 minute;
步骤65)试验结束后，直接将电压将至0V，并切断电源。Step 65) After the test, directly reduce the voltage to 0V, and cut off the power supply.
交流电压测量单元可以对干式空心电抗器的电压进行监测，保证对耐压试验的干式空心电抗器电压进行监测。方法中设备技术参数是否满足要求是指计算所得的电流或者电压在设备的额定参数之内，不会对设备造成损坏，保证试验的顺利进行。The AC voltage measuring unit can monitor the voltage of the dry-type air-core reactor, so as to ensure the monitoring of the voltage of the dry-type air-core reactor in the withstand voltage test. In the method, whether the technical parameters of the equipment meet the requirements means that the calculated current or voltage is within the rated parameters of the equipment, which will not cause damage to the equipment and ensure the smooth progress of the test.
实施例三Embodiment Three
如图2所示，由于本发明在局部放电监测单元5中使用了脉冲电流法进行局部放电量的监测，因此需要在加压试验开始前，对整个试验系统进行局放量(局部放电量)的校准，利用标准电容器和方波发生器，对整个试验回路进行校准，其中方波发生器输出一端接地，另一端利用信号线输出方波信号，并施加在耦合电容器的首端，以500pC为例，此时调整方波输出使其输出为500pC，同时在局部放电检测仪上应能读出方波信号，按照局部放电检测仪的使用说明进行方波校准即可。As shown in Figure 2, since the present invention uses the pulse current method to monitor the partial discharge in the partial discharge monitoring unit 5, it is necessary to measure the partial discharge (partial discharge) of the whole test system before the pressurization test starts. Calibration, use a standard capacitor and a square wave generator to calibrate the entire test circuit, where the output of the square wave generator is grounded at one end, and the other end uses the signal line to output a square wave signal, and is applied to the first end of the coupling capacitor, taking 500pC as an example At this time, adjust the square wave output to 500pC, and at the same time, the square wave signal should be read out on the partial discharge detector, and the square wave calibration can be performed according to the instructions of the partial discharge detector.
本发明的方法清晰，突破了传统干式空心电抗器无法在现场进行匝间绝缘有效的瓶颈，使干式空心电抗器现场进行感应耐压成为可能，同时在试验过程中对局部放电量水平进行监测，填补了国内现场考核干式空心电抗器匝间绝缘性能的空白，有效干式空心电抗器的安全运行。The method of the present invention is clear, breaks through the bottleneck that traditional dry-type air-core reactors cannot perform effective inter-turn insulation on site, and makes it possible to conduct induction withstand voltage of dry-type air-core reactors on site, and at the same time, monitor the level of partial discharge during the test The monitoring has filled the blank of the domestic on-site assessment of the inter-turn insulation performance of dry-type air-core reactors, and is effective for the safe operation of dry-type air-core reactors.
最后说明的是，以上实施例仅用以说明本发明的技术方案而非限制，本领域普通技术人员对本发明的技术方案所做的其他修改或者等同替换，只要不脱离本发明技术方案的精神和范围，均应涵盖在本发明的权利要求范围当中。Finally, it is noted that the above embodiments are only used to illustrate the technical solution of the present invention without limitation, other modifications or equivalent replacements made by those skilled in the art to the technical solution of the present invention, as long as they do not depart from the spirit and spirit of the technical solution of the present invention All should be included in the scope of the claims of the present invention.
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