CN204188709U - Insulating oil dielectric loss detection system - Google Patents

Insulating oil dielectric loss detection system Download PDF

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CN204188709U
CN204188709U CN201420583562.9U CN201420583562U CN204188709U CN 204188709 U CN204188709 U CN 204188709U CN 201420583562 U CN201420583562 U CN 201420583562U CN 204188709 U CN204188709 U CN 204188709U
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static contact
contact
dielectric loss
movable contact
double
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吕刚
瞿少君
徐望圣
李可
叶明�
周培
李道豫
邱志远
李毅
唐华东
孙勇
邓海辉
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Guangdong Guanneng Electric Power Science & Technology Development Co Ltd
Guiyang Bureau Extra High Voltage Power Transmission Co
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Guangdong Guanneng Electric Power Science & Technology Development Co Ltd
Guiyang Bureau Extra High Voltage Power Transmission Co
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Abstract

本实用新型公开了绝缘油介质损耗检测系统,其包括变频电源、励磁变压器T、以及电抗器L和检测电路、双刀双掷开关K1,所述双刀双掷开关K1包括联动的第一动触点和第二动触点、以及与第一动触点配合的第一静触点和第二静触点、与第二动触点配合的第三静触点和第四静触点,其中,所述电抗器L的两端分别与励磁变压器T的二次绕组以及第一动触点相连,所述第二动触点与标准电容器Cn的一端相连,所述第一静触点与第三静触点相连,所述第二静触点接地,所述第四静触点连接至励磁变压器T的二次绕组与电抗器L之间。本实用新型通过双刀双掷开关实现绝缘油介质损耗检测中的试验励磁变升压和串联谐振升压的切换,以适应不同试品电容器的测量。

The utility model discloses a detection system for dielectric loss of insulating oil, which includes a frequency conversion power supply, an excitation transformer T, a reactor L, a detection circuit, a double-pole double-throw switch K1, and the double-pole double-throw switch K1 includes a linkage first action contact and the second movable contact, and the first static contact and the second static contact matched with the first movable contact, the third static contact and the fourth static contact matched with the second movable contact, Wherein, the two ends of the reactor L are respectively connected to the secondary winding of the excitation transformer T and the first movable contact, the second movable contact is connected to one end of the standard capacitor Cn, and the first static contact is connected to The third static contact is connected, the second static contact is grounded, and the fourth static contact is connected between the secondary winding of the excitation transformer T and the reactor L. The utility model realizes the switching of the test excitation transformer boost and the series resonance boost in the detection of insulating oil dielectric loss through the double-pole double-throw switch, so as to adapt to the measurement of capacitors of different samples.

Description

绝缘油介质损耗检测系统Insulating oil dielectric loss detection system

技术领域technical field

本实用新型涉及电力设备维护技术领域,具体涉及一种绝缘油介质损耗检测系统。The utility model relates to the technical field of electric equipment maintenance, in particular to a dielectric loss detection system for insulating oil.

背景技术Background technique

充油设备如电力变压器是电力系统中主要的设备之一,也是较为昂贵的设备之一,因绝缘故障造成的经济损失是巨大的,因此如何预防电力变压器的潜在故障,确保电网的可靠性运行,一直是国内外电力长期研究的重要课题。绝缘油的质量关系到充油设备的安全可靠运行,同时还依据绝缘油来预测充油设备将会出现的问题和运行寿命。绝缘油介质损耗因数(tanδ)作为一种有效、可判断绝缘油样完好性的参数,可以表明运行中油的脏污与劣化成都或者油的处理结果好坏,依此来判断充油设备绝缘情况,特别是对绝缘受潮、老化变质等分布式缺陷是卓有成效的。所谓介质损耗因数就是电介质上电压与电流夹角的余角,介质损耗因数只与材料特性有关,而与材料的尺寸和体积无关。现有的介质损耗因数测量方法主要有电桥法、相位差法以及全数字测量法,电桥法的优点在于可靠性高以及准确,但是操作复杂,无法在现场应用。相位差法测试较为简单,采用互感器方式进行,但是受环境影响较大,测量精度低。而全数字测量法可通过介损测试仪实现全数字滤波技术和矢量法测试原理,通过电容分压法实现检测,测量精度高,性能稳定,但是对于不同的充油设备,其等效的试品电容器的大小不同,而这种变频电源的升压方式单一,对不同电容大小的试品电容器进行介质损耗测量,精度不一,通用性差。Oil-filled equipment such as power transformers is one of the main equipment in the power system, and it is also one of the more expensive equipment. The economic losses caused by insulation failures are huge. Therefore, how to prevent potential failures of power transformers and ensure the reliable operation of the power grid , has been an important subject of long-term research on electric power at home and abroad. The quality of insulating oil is related to the safe and reliable operation of oil-filled equipment. At the same time, the problems and operating life of oil-filled equipment can be predicted based on insulating oil. The dielectric loss factor of insulating oil (tanδ) is an effective parameter that can judge the integrity of insulating oil samples. It can indicate the dirt and deterioration of the oil during operation or the treatment result of the oil is good or bad, so as to judge the insulation condition of oil-filled equipment , especially for distributed defects such as insulation damp and aging deterioration. The so-called dielectric loss factor is the complementary angle between the voltage and current angle on the dielectric. The dielectric loss factor is only related to the material characteristics, but has nothing to do with the size and volume of the material. The existing dielectric loss factor measurement methods mainly include bridge method, phase difference method and all-digital measurement method. The advantages of the bridge method are high reliability and accuracy, but the operation is complicated and cannot be applied in the field. The phase difference method test is relatively simple, and it is carried out in the form of a transformer, but it is greatly affected by the environment and the measurement accuracy is low. The all-digital measurement method can realize the full-digital filtering technology and the vector method test principle through the dielectric loss tester, and realize the detection through the capacitor voltage divider method. The measurement accuracy is high and the performance is stable. However, for different oil-filled equipment, the equivalent test The size of the sample capacitors is different, and the step-up method of this variable frequency power supply is single, and the dielectric loss measurement of the sample capacitors with different capacitances has different accuracy and poor versatility.

实用新型内容Utility model content

针对以上不足,本实用新型的目的在于提供一种绝缘油介质损耗检测系统,其可以通过双刀双掷开关实现绝缘油介质损耗检测中的试验励磁变升压和串联谐振升压的切换,以适应不同试品电容器的测量。In view of the above deficiencies, the purpose of this utility model is to provide a dielectric loss detection system for insulating oil, which can realize the switching of test excitation transformer boost and series resonance boost in the detection of dielectric loss of insulating oil through a double-pole double-throw switch. Adapt to the measurement of capacitors of different samples.

为实现以上目的,本实用新型采取的技术方案是:For realizing above object, the technical scheme that the utility model takes is:

绝缘油介质损耗检测系统,其包括变频电源、励磁变压器T、以及电抗器L和检测电路,所述变频电源的输出端与励磁变压器T的一次绕组侧相连,所述检测电路包括分压器C1、C2、标准电容器Cn以及介损测试仪,所述分压器C1和C2串联后一端与试品电容器Cx以及标准电容器Cn的一端电性连接,所述分压器C1和C2串联后的另一端接地,所述介损测试仪的三个检测输入接口分别与试品电容器Cx的另一端、标准电容器Cn的另一端以及分压器C1和C2之间电性连接,所述绝缘油介质损耗检测系统进一步包括一双刀双掷开关K1,所述双刀双掷开关K1包括联动的第一动触点和第二动触点、以及与第一动触点配合的第一静触点和第二静触点、与第二动触点配合的第三静触点和第四静触点,其中,所述电抗器L的两端分别与励磁变压器T的二次绕组以及第一动触点相连,所述第二动触点与标准电容器Cn的一端相连,所述第一静触点与第三静触点相连,所述第二静触点接地,所述第四静触点连接至励磁变压器T的二次绕组与电抗器L之间。Insulating oil dielectric loss detection system, which includes a frequency conversion power supply, an excitation transformer T, a reactor L and a detection circuit, the output end of the frequency conversion power supply is connected to the primary winding side of the excitation transformer T, and the detection circuit includes a voltage divider C1 . One end is grounded, and the three detection input interfaces of the dielectric loss tester are electrically connected to the other end of the sample capacitor Cx, the other end of the standard capacitor Cn, and the voltage divider C1 and C2 respectively, and the dielectric loss of the insulating oil The detection system further includes a double-pole double-throw switch K1, the double-pole double-throw switch K1 includes a first movable contact and a second movable contact in linkage, and a first static contact and a second movable contact matched with the first movable contact. Two static contacts, a third static contact and a fourth static contact matched with the second movable contact, wherein the two ends of the reactor L are respectively connected to the secondary winding of the excitation transformer T and the first movable contact connected, the second moving contact is connected to one end of the standard capacitor Cn, the first static contact is connected to the third static contact, the second static contact is grounded, and the fourth static contact is connected to Between the secondary winding of the excitation transformer T and the reactor L.

本实用新型与现有技术相比,其有益效果在于:本实用新型通过双刀双掷开关实现绝缘油介质损耗检测中的试验励磁变升压(第一动触点与第二静触点配合,第二动触点与第四静触点配合)和串联谐振升压(第一动触点与第一静触点配合,第二动触点与第三静触点配合)的切换,以分别适应小试品电容器和大试品电容器(大小试品电容器以5000pF的容值为界),通用性强。Compared with the prior art, the utility model has the beneficial effect that: the utility model realizes the test excitation variable boost in the dielectric loss detection of insulating oil through the double-pole double-throw switch (the first moving contact cooperates with the second static contact , the second moving contact cooperates with the fourth static contact) and the switching of series resonance boost (the first moving contact cooperates with the first static contact, and the second movable contact cooperates with the third static contact), to It is suitable for small sample capacitors and large sample capacitors respectively (the capacitance value of the large and small sample capacitors is bounded by 5000pF), and has strong versatility.

附图说明Description of drawings

图1是本实用新型绝缘油介质损耗检测系统的电路原理图。Fig. 1 is the circuit principle diagram of the insulating oil dielectric loss detection system of the utility model.

具体实施方式Detailed ways

下面结合附图和具体实施方式对本实用新型的内容做进一步详细说明。The content of the present utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

实施例Example

请参照图1所示,绝缘油介质损耗检测系统,其包括变频电源、励磁变压器T、以及电抗器L、检测电路和双刀双掷开关,变频电源的输入端连接至交流电源(例如380V三相电源),其输出端与励磁变压器T的一次绕组侧相连,检测电路包括分压器C1、C2、标准电容器Cn以及介损测试仪,分压器C1和C2串联后一端与试品电容器Cx以及标准电容器Cn的一端电性连接,分压器C1和C2串联后的另一端接地,介损测试仪的三个检测输入接口分别与试品电容器Cx的另一端、标准电容器Cn的另一端以及分压器C1和C2之间电性连接,绝缘油介质损耗检测系统进一步包括一双刀双掷开关K1,双刀双掷开关K1包括联动的第一动触点和第二动触点、以及与第一动触点配合的第一静触点和第二静触点、与第二动触点配合的第三静触点和第四静触点,其中,励磁变压器T的二次绕组的一端接地,另一端通过电抗器L连接至第一动触点,第二动触点与标准电容器Cn的一端相连,第一静触点与第三静触点相连,第二静触点接地,第四静触点连接至励磁变压器T的二次绕组与电抗器L之间。Please refer to Fig. 1, the insulating oil dielectric loss detection system, which includes a variable frequency power supply, an excitation transformer T, and a reactor L, a detection circuit and a double-pole double-throw switch, and the input end of the variable frequency power supply is connected to an AC power supply (such as 380V three phase power supply), its output end is connected to the primary winding side of excitation transformer T, the detection circuit includes voltage divider C1, C2, standard capacitor Cn and dielectric loss tester, and the end of voltage divider C1 and C2 is connected in series with the sample capacitor Cx And one end of the standard capacitor Cn is electrically connected, the other end of the voltage divider C1 and C2 connected in series is grounded, the three detection input interfaces of the dielectric loss tester are respectively connected to the other end of the sample capacitor Cx, the other end of the standard capacitor Cn and The voltage divider C1 and C2 are electrically connected, and the insulating oil dielectric loss detection system further includes a double-pole double-throw switch K1, and the double-pole double-throw switch K1 includes a first movable contact and a second movable contact linked together, and The first static contact and the second static contact matched with the first movable contact, the third static contact and the fourth static contact matched with the second movable contact, wherein, one end of the secondary winding of the excitation transformer T Ground, the other end is connected to the first moving contact through the reactor L, the second moving contact is connected to one end of the standard capacitor Cn, the first static contact is connected to the third static contact, the second static contact is grounded, and the second static contact is connected to one end of the standard capacitor Cn. The four static contacts are connected between the secondary winding of the exciting transformer T and the reactor L.

使用时,对于较小容值(小于5000pF)的试品电容器而言,采用试验励磁变升压(即并联电抗器)的方式,此时,第一动触点与第二静触点连接,第二动触点与第四静触点连接,电抗器L、励磁变压器T以及检测电路之间相互并联,通过励磁变升压给试品电容器提供电源,能够实现自动双变频抗干扰,测量效果最佳。对于较大容值(大于5000pF)的试品电容器而言,采用串联谐振升压的方式,此时,第一动触点与第一静触点连接,第二动触点与第三静触点连接,电抗器L和检测电路之间形成串联结构连接至励磁变压器T的二次绕组。串联谐振测量大电容具有天然优势,只有大电容才能谐振到较低的频率。When in use, for the sample capacitor with a small capacitance (less than 5000pF), the method of test excitation transformer step-up (that is, shunt reactor) is used. At this time, the first moving contact is connected to the second static contact, The second moving contact is connected to the fourth static contact, the reactor L, the excitation transformer T and the detection circuit are connected in parallel with each other, and the excitation transformer is boosted to provide power to the test capacitor, which can realize automatic double-conversion anti-interference and measure the effect optimal. For the sample capacitor with a large capacitance (greater than 5000pF), the series resonance boost method is adopted. At this time, the first moving contact is connected to the first static contact, and the second moving contact is connected to the third static contact. Point connection, the reactor L and the detection circuit form a series structure connected to the secondary winding of the excitation transformer T. Series resonance has a natural advantage in measuring large capacitors, only large capacitors can resonate to lower frequencies.

上列详细说明是针对本实用新型可行实施例的具体说明,该实施例并非用以限制本实用新型的专利范围,凡未脱离本实用新型所为的等效实施或变更,均应包含于本案的专利范围中。The above detailed description is a specific description of the feasible embodiment of the utility model. This embodiment is not used to limit the patent scope of the utility model. Any equivalent implementation or change that does not deviate from the utility model shall be included in this case within the scope of the patent.

Claims (1)

1.绝缘油介质损耗检测系统,其包括变频电源、励磁变压器T、以及电抗器L和检测电路,所述变频电源的输出端与励磁变压器T的一次绕组侧相连,所述检测电路包括分压器C1、C2、标准电容器Cn以及介损测试仪,所述分压器C1和C2串联后一端与试品电容器Cx以及标准电容器Cn的一端电性连接,所述分压器C1和C2串联后的另一端接地,所述介损测试仪的三个检测输入接口分别与试品电容器Cx的另一端、标准电容器Cn的另一端以及分压器C1和C2之间电性连接,其特征在于,所述绝缘油介质损耗检测系统进一步包括一双刀双掷开关K1,所述双刀双掷开关K1包括联动的第一动触点和第二动触点、以及与第一动触点配合的第一静触点和第二静触点、与第二动触点配合的第三静触点和第四静触点,其中,所述电抗器L的两端分别与励磁变压器T的二次绕组以及第一动触点相连,所述第二动触点与标准电容器Cn的一端相连,所述第一静触点与第三静触点相连,所述第二静触点接地,所述第四静触点连接至励磁变压器T的二次绕组与电抗器L之间。1. Insulating oil dielectric loss detection system, which includes a variable frequency power supply, an excitation transformer T, and a reactor L and a detection circuit, the output end of the variable frequency power supply is connected to the primary winding side of the excitation transformer T, and the detection circuit includes a voltage divider C1, C2, standard capacitor Cn and dielectric loss tester, one end of the voltage divider C1 and C2 is connected in series with the test capacitor Cx and one end of the standard capacitor Cn, and the voltage divider C1 and C2 are connected in series The other end of the dielectric loss tester is grounded, and the three detection input interfaces of the dielectric loss tester are electrically connected to the other end of the sample capacitor Cx, the other end of the standard capacitor Cn, and the voltage divider C1 and C2 respectively. It is characterized in that, The insulating oil dielectric loss detection system further includes a double-pole double-throw switch K1, and the double-pole double-throw switch K1 includes a linked first movable contact and a second movable contact, and a second movable contact matched with the first movable contact. A static contact and a second static contact, a third static contact and a fourth static contact matched with the second movable contact, wherein the two ends of the reactor L are respectively connected to the secondary winding of the excitation transformer T and the first movable contact, the second movable contact is connected to one end of the standard capacitor Cn, the first static contact is connected to the third static contact, the second static contact is grounded, and the first static contact is connected to the ground. The four static contacts are connected between the secondary winding of the exciting transformer T and the reactor L.
CN201420583562.9U 2014-10-10 2014-10-10 Insulating oil dielectric loss detection system Expired - Lifetime CN204188709U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107860982A (en) * 2017-11-06 2018-03-30 国网福建省电力有限公司 The dielectric loss test circuit and its control method that a kind of pre- anti-induced electrical is sent
CN114167187A (en) * 2021-12-07 2022-03-11 中国南方电网有限责任公司超高压输电公司贵阳局 AC filter capacitor abnormality detection device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107860982A (en) * 2017-11-06 2018-03-30 国网福建省电力有限公司 The dielectric loss test circuit and its control method that a kind of pre- anti-induced electrical is sent
CN107860982B (en) * 2017-11-06 2019-12-27 国网福建省电力有限公司 Dielectric loss test circuit for preventing induced electricity from being sent backwards and control method thereof
CN114167187A (en) * 2021-12-07 2022-03-11 中国南方电网有限责任公司超高压输电公司贵阳局 AC filter capacitor abnormality detection device

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