WO2013063856A1 - 高压漏电流对高压三相电流互感器误差影响量的测试方法 - Google Patents

高压漏电流对高压三相电流互感器误差影响量的测试方法 Download PDF

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Publication number
WO2013063856A1
WO2013063856A1 PCT/CN2012/000663 CN2012000663W WO2013063856A1 WO 2013063856 A1 WO2013063856 A1 WO 2013063856A1 CN 2012000663 W CN2012000663 W CN 2012000663W WO 2013063856 A1 WO2013063856 A1 WO 2013063856A1
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Prior art keywords
current
current transformer
voltage
phase
transformer
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French (fr)
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杨华云
江波
艾兵
刘刚
杨勇波
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Electric Power Research Institute of State Grid Sichuan Electric Power Co Ltd
State Grid Corp of China SGCC
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Electric Power Research Institute of State Grid Sichuan Electric Power Co Ltd
State Grid Corp of China SGCC
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/62—Testing of transformers

Definitions

  • the invention relates to a new test method for the influence of high-voltage leakage current on the error of the high-voltage current transformer, and is suitable for directly testing the influence of the leakage current on the current transformer error under the high-voltage state, and is especially suitable for the high-voltage leakage current to the high voltage three.
  • a direct test method for the influence of phase current transformer error is especially suitable for the influence of phase current transformer error.
  • the high voltage will generate a capacitive current flowing from the primary winding to the secondary winding (when the secondary winding is unshielded), and this current flows partially through the transformer.
  • the secondary equipment part of which flows directly to the ground terminal of the secondary winding, so the current transformer error will change more or less.
  • the capacitive electric book flow flowing through the primary winding flows to the secondary electrostatic screen, the secondary winding is induced.
  • the current transformer error may exceed the error limit.
  • the leakage current test method given in JJG 1021-2007 “Power Transformer” is as follows: During the test, the current transformer is connected to the rated load twice, and the S2 terminal is grounded. Apply the test voltage to the primary side according to the rated voltage factor specified in GB1208, and then measure the secondary voltage U2 with an AC voltmeter. In this way, the magnitude of the leakage current can be derived from U2, and the estimated value of the high-voltage leakage current on the current transformer error is obtained.
  • the measurement method of leakage current Apply 120% of the rated voltage to the high-voltage terminal of the current transformer, at which time the current transformer does not pass current.
  • the applied voltage causes the current transformer to generate a capacitive current and can be measured by a voltage drop Ui connected to the resistor R between the secondary terminals of the current transformer.
  • R When the rated secondary current of the current transformer is 1A, it is recommended that R is 100 ⁇ ; when the rated secondary current is 5A, R is recommended to be 5 ⁇ .
  • the Ui of the secondary winding terminal S1 and the grounding of S2 are measured separately, and the larger of these two measurements is used as the calculation value. Then, according to the secondary voltage measurement value, the influence range of the high-voltage leakage current on the current transformer is calculated.
  • the method of measuring the leakage current is to apply a high voltage on the primary side of the current transformer, and then measure the voltage across the secondary side of the current transformer.
  • the resistance between the secondary terminals can be selected within the range of the rated load to 100 ⁇ . Its size to deal with leakage current Has little effect.
  • the resistance given in JJG 1021-2007 is the rated load resistance, so that its resistance is too small, the voltage across it is around lmV, and it is difficult to accurately measure with the AC RMS voltmeter.
  • the object of the present invention is to provide a test method for directly measuring the result and the accurate test result of high-voltage leakage current to the high-voltage three-phase current transformer error.
  • the object of the present invention is achieved by a method for testing the influence of high-voltage leakage current on the error of a high-voltage three-phase current transformer, according to the following steps: providing a three-phase symmetrical rated voltage through a three-phase booster and applying it to a high voltage The primary terminal of the current transformer in the three mutual inductors is written. At this time, the primary winding of the current transformer does not pass current, the secondary winding is short-circuited or the rated load is connected in series;
  • the secondary output terminals K1, K2 of the above-mentioned test current transformer T 1 are respectively connected to the operating current input terminals ⁇ 0, ⁇ of the current transformer calibrator.
  • the primary terminal of the current transformer to which the three-phase symmetric rated voltage is applied is the P1 terminal or the ⁇ 2 terminal.
  • the invention designs accurately and directly measures the influence of the high-voltage leakage current on the error of the current transformer in the high-voltage three-reactor, especially the influence of the leakage current on the error of the current transformer at 1% and 5% of the rated current.
  • the three-phase boosting device in the field of testing with a new portable high-voltage three-phase combined transformer test set provides 100% three-phase symmetrical rated voltage while being applied to the current in the high-voltage three-phase transformer. On the primary terminal of the transformer, at this time, the current transformer primary winding does not pass current, the secondary winding is short-circuited or the series rated load.
  • the secondary winding of the current transformer will have a high-voltage leakage current flowing more or less, which has an influence on the accuracy of the current transformer, especially at 1%.
  • the error at the rated current has the largest influence.
  • the leakage current generated by the current transformer under the three-phase high voltage is directly sent to the current transformer calibrator as the differential current.
  • another current riser and a transformer are used to generate a 1% rated current in phase with the measured high voltage of the primary end of the transformer at low voltage.
  • the current is fed into the current transformer calibrator, so that the influence of the high-voltage three-phase transformer on the error of the current transformer under the actual operating conditions can be directly measured by the current transformer calibration.
  • the present invention is a direct test method.
  • the proposed direct test method for testing the influence of leakage current on the current transformer using the differential line is simple and convenient, easy to implement, and improves the detection efficiency.
  • This test method can directly test the influence of leakage current under the action of high-voltage three-phase electric field on the error of a phase current transformer, which truly reflects the running performance of the high-voltage three-reactor under actual operating conditions.
  • the design and manufacturing defects of the three-phase current transformer can be found.
  • the method realizes the direct test of the influence of the leakage current generated by the external rated voltage of the high-voltage three-phase current transformer on the error of the current transformer, and uses the current transformer calibrator differential line to directly measure the ratio of ⁇ / ⁇ . , effectively improve the accuracy of test results and measurement efficiency.
  • Figure 1 is a schematic diagram of the measurement of the present invention.
  • T0 and ⁇ are the working current input terminals of the current transformer calibrator, and K and D are current transformer calibrator differential current (BP small current) inputs.
  • T1 is the current transformer for testing.
  • API and AP2 are the primary and non-polar terminals of the A-phase current transformer in the high-voltage three-inductor.
  • CP1 and CP2 are the primary and non-polar terminals of the C-phase current transformer in the high-voltage three-inductor.
  • Asl and as2 are high pressure
  • the secondary polarity end and the non-polar end of the A phase current transformer in the three mutual inductance, cs l and cs2 are the secondary polarity end and the non-polar end of the C phase current transformer in the high voltage three mutual inductance.
  • Figure 1 shows that the three-phase booster in the new portable high-voltage three-phase combined transformer test set provides 100% three-phase symmetrical voltage rating while being applied to the high-voltage current in the high-voltage three-phase transformer.
  • the primary winding of the high-voltage current transformer does not pass current, the secondary winding is short-circuited or the series rated load is applied. Measurements are made in two cases, one is to apply a high voltage from the P1 end of the current transformer, and the other is to apply a high voltage from the P2 end of the current transformer.
  • the secondary winding of the current transformer will have more or less high-current leakage current flowing, which has an impact on the accuracy of the current transformer, especially at 1%.
  • the error at the rated current has the largest influence.
  • the flow will be used as a differential current input transformer calibrator with a leakage current of ⁇ .
  • the 1% secondary output rated current transformer is supplied to the transformer calibrator as the operating current through the current regulator and the test current transformer T1.
  • the operating current is the phase of the current and the corresponding current.
  • the phase of the applied voltage at the primary end of the transformer is the same, so that the influence of the high-voltage leakage current on the current transformer at 1% of the rated current can be directly measured directly by the transformer calibrator.
  • the working current is input from the TO terminal of the transformer calibrator, the small current of the measured high-voltage leakage current is input from the K-terminal of the transformer calibrator. According to the current measurement principle of the transformer calibrator, high-voltage leakage current can be obtained.
  • the amount of error affecting the current transformer is
  • ff is the amount of influence of the high-voltage leakage current on the current transformer, and / is the ratio of the error influence amount, ?
  • ⁇ /> is the in-phase component of the leakage current
  • ⁇ is the orthogonal component of the leakage current.
  • the embodiment of the present invention is described by taking an example of measuring the influence of the high-voltage leakage current of the ⁇ phase current transformer on its error, and other phase current transformers are measured by the same embodiment.
  • FIG. 1 when the present invention is to measure the influence of the leakage current of the high-voltage three-reactor on the current transformer error, a symmetric three-phase high voltage is generated by the three-phase booster, and then A is added to the three mutual inductors. , B, C three high voltage terminals At the same time, the terminals of the three mutual terminals of the mutual inductance should be grounded.
  • the phase A high voltage is first added from the API terminal, the secondary terminal non-polar terminal as2 is grounded and connected to the D terminal of the current transformer calibrator, and the polarity end as l is directly connected to the K terminal of the current transformer calibrator.
  • This high-voltage leakage current will be sent to the current transformer calibrator as a differential current.
  • a current riser and a current transformer T1 a current having the same phase as the high voltage applied to the phase A is generated, and the current is 1% of the secondary rated output of the phase A current transformer, and the current is used as the current.
  • the working current of the transformer calibrator is directly sent to the calibration, that is, as shown in Fig.
  • the secondary output terminals of the current transformer T1 are connected to ⁇ 0 and ⁇ , respectively.
  • the current transformer calibration can directly measure the influence of the high-voltage leakage current generated by the three-phase combined transformer on the actual working rated high voltage on the error of the A-phase current transformer at 1% of the rated current.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

一种高压漏电流对高压三相电流互感器误差影响量的测试方法，采用升压器在高压三相电流互感器一次端子上加上三相对称额定电压，将电流互感器二次端子输出的漏电流作为差流电流输入互感器校验仪，用升流器和试验用电流互感器(T1)产生被测电流互感器二次输出的1%额定电流作为工作电流输入互感器校验仪，从而由互感器校验仪直接测量出高压泄漏电流对三相电流互感器在1%额定电流点的误差影响量。该互感器校验仪的工作电流的相位与被测电流互感器一次端子所加电压的相位一致，从而真实反映了实际运行条件下高压三相电流互感器的运行性能，提高了测试结果的准确性和测试效率。

Description

高压漏电流对高压三相电流互感器误差影响量的测试方法 技术领域
本发明涉及一种新的高压漏电流对高压电流互感器误差影响量的测试方法， 适用于测量高压状态下漏电流对电流互感器误差影响量的直接测试，尤其适用于 高压漏电流对高压三相电流互感器误差影响量的直接测试方法。
说背景技术
如果将高压加到高压电流互感器的一次绕组，高电压会产生从一次绕组流向 二次绕组的电容电流 （当二次绕组无屏蔽措施时）， 而此电流部分流过与互感器 相连的二次设备， 部分直接流向二次绕组的接地端子， 因此电流互感器误差或多 或少会发生变化。 此外， 流过一次绕组的电容电书流即使流向二次静电屏， 也还是 会产生二次绕组被感应的现象。 特别是在 1 %或 5 %额定电流下， 电流互感器误 差可能超过误差限值。
国家计量检定规程 JJG 1021-2007 《电力互感器》 中给出的漏电流试验方法 为： 试验时电流互感器二次接入额定负荷， S2端接地。 一次侧按 GB1208规定的 额定电压因数施加试验电压， 然后用交流电压表测量二次电压 U2。 这样可根据 U2 得出泄漏电流的大小， 进而得出高压漏电流的对电流互感器误差影响量的估 计值。
机械行业标准 JB/T 10432 -2004 《三相组合互感器》 中给出的漏电流的测 量方法： 在电流互感器的高压端子上施加 120 %的额定电压， 此时电流互感器不 通电流。该外施电压使电流互感器产生了电容电流， 并可由接到电流互感器二次 端子之间的电阻 R上的电压降 Ui来测量。当电流互感器的额定二次电流为 1A时， 推荐 R为 100 Ω ; 当额定二次电流为 5A时，推荐 R为 5 Ω。 分别测量二次绕组端 子 S1接地和 S2接地时的 Ui， 以这两次测量中的较大值作为计算用数值。 然后 根据二次电压测量值来计算出高压漏电流对电流互感器的误差影响范围。
从上述两个规程或标准中可以看出，测量漏电电流的方法都是在电流互感器 一次侧加高电压， 然后测量电流互感器二次侧两端的电压。从以上两个规程或标 准的描述中可以看出， 由于高压电流互感器的一次电压很高， 测量漏电流时， 其 二次端子之间的电阻可以在额定负荷到 100 Ω的范围内选取， 其大小应对漏电流 影响不大。 JJG 1021- 2007中给出的电阻为额定负荷电阻， 这样其电阻太小， 其 两端电压在 lmV 左右， 用交流有效值电压表很难准确测出。 JB/T 10432 - 2004 推荐的 100 Ω或 5 Ω， 这样漏电流为 1mA的时候电压可以到 10mV左右， 但是普通 的交流有效值电压表也很难准确测量出其大小。同时上述方法不能直接测量出三 相电压影响下漏电流对高压三相组合互感器中电流互感器的实际误差影响量。 发明内容
本发明的目的是提供一种说直接测量出结果、测试结果准确的高压漏电流对高 压三相电流互感器误差影响量的测试方法。
本发明的目的是这样实现的：一种高压漏电流对高压三相电流互感器误差影 响量的测试方法， 按以下歩骤进行： 通过三相升压器提供三相对称额定电压并施 加在高压三相互感器中电流互感器的一次端子上书， 此时， 电流互感器一次绕组不 通电流， 二次绕组短路或者串联额定负荷；
测量时将电流互感器的二次极性端接入电流互感器校验仪的 K端，二次非极 性端接地并接入电流互感器校验仪的 D端， 使漏电流作为差流输入互感器校验 仪； 同时通过升流器和试验用电流互感器 T1提供 1 %二次输出额定电流给电流 互感器校验仪作为工作电流，该额定电流的相位与上述电流互感器一次端子所施 加电压的相位一致， 通过电流互感器校验仪直接测量出高压漏电流在 1 %额定电 流点对高压电流互感器的误差影响量；
上述试验用电流互感器 T 1的二次输出端 K1、K2分别和电流互感器校验仪的 工作电流输入端 Τ0、 Τχ相连接。
上述施加三相对称额定电压的电流互感器一次端子为 P1端子或 Ρ2端子。 为了准确了解电流互感器实际运行条件下高压漏电流对电流互感器准确度 的影响， 直接准确测量出高压漏电流对高压三相电流互感器误差影响量， 从而准 确了解电流互感器实际运行条件下运行性能， 是本专利的出发点和着眼点。
本发明为了准确、直接测量出高压漏电流对高压三相互感器中电流互感器的 误差影响量，特别是漏电流对电流互感器的 1 %和 5 %额定电流下的误差影响量， 设计了一种高压漏电流对高压三相互感器中电流互感器的误差影响量的直接测 试方法。测试时通过现场用新型便携式高压三相组合互感器成套检测设备中的三 相升压设备提供 100 %的三相对称额定电压同时施加在与高压三相互感器中电流 互感器的一次端子上， 此时， 电流互感器一次绕组不通电流， 二次绕组短路或者 串联额定负荷。在高压三相互感器的一次端子施压三相对称额定电压后， 电流互 感器二次绕组或多或少将有高压漏电流流过， 对电流互感器的准确度产生影响， 特别时在 1 %额定电流时的误差影响量最大。 在测量高压三相互感器某一相电流 互感器的漏电流误差影响量时，将电流互感器的在三相高压下产生的漏电流直接 作为差流电流送入电流互感器校验仪。 同时， 通过另一个升流器和互感器在低压 下产生与测量的互感器一次端高电压同相位的 1 %额定电流， 将这一电流作为工 说
作电流送入电流互感器校验仪，这样可直接通过电流互感器校验测量出高压三相 互感器在实际运行条件下高压漏电流对电流互感器的误差影响量。
本发明是一种直接测试方法。
本发明的有益效果是： 书
1、 实现了高压三相互感器外施额定电压所产生的漏电流对电流互感器的误 差影响量的直接测试， 采用互感器校验仪测差线路， 直接测出 Δ Ι/Ι的比值， 有 效提高了测试结果的准确性。
2、 提出的利用测差线路测试漏电流对电流互感器的误差影响量的直接测试 方法简单方便， 容易实现， 提高了检测工作效率。
3、 本测试方法能够直接测试出高压三相电场共同作用下的漏电流对某一相 电流互感器所产生的误差影响量，真实反映了实际运行条件下高压三相互感器的 运行性能， 并能发现三相电流互感器的设计和制造缺陷。
本方法实现了高压三相电流互感器外施额定电压所产生的漏电流对电流互 感器的误差影响量的直接测试，采用电流互感器校验仪测差线路，直接测出 ΔΙ/Ι 的比值， 有效提高了测试结果的准确性和测量工作效率。 附图说明
图 1是本发明的测量原理图。
具体实施方式
附图中的标志说明： 图 1中 T0、 Τχ为电流互感器校验仪的工作电流输入端， K、 D 为电流互感器校验仪差流（BP小电流)输入。 T1 为试验用电流互感器。 API 和 AP2为高压三相互感器中 A相电流互感器一次极性端和非极性端， CP1和 CP2 为高压三相互感器中 C相电流互感器一次极性端和非极性端。 asl和 as2为高压 三相互感器中 A相电流互感器二次极性端和非极性端， cs l和 cs2为高压三相互 感器中 C相电流互感器二次极性端和非极性端。
图 1示出，测量时通过现场用新型便携式高压三相组合互感器成套检测设备 中的三相升压器提供 100 %的三相对称额定电压同时施加在与高压三相互感器中 高压电流互感器的一次端子上， 此时， 高压电流互感器一次绕组不通电流， 二次 绕组短路或者串联额定负荷。 分两种情况进行测量， 一种是从电流互感器的 P1 端施加高压进行测量， 另一种是从电流互感器的 P2端施加高电压进行测量。 在 高压三相组合互感器的施压三说相对称额定电压后，电流互感器二次绕组或多或少 将有高压漏电流流过， 对电流互感器的准确度产生影响， 特别时在 1 %额定电流 时的误差影响量最大。测量时将电流互感器的二次极性端接入校验仪（即电流互 感器校验仪， 下同） 的 K端， 二次非极性端接地并接入校验仪的 D端， 这样漏电 书
流将作为差流输入互感器校验仪， 设漏电流为^。 如图 1 所示， 同时通过升流 器和试验用电流互感器 T1提供 1 %二次输出额定电流互感器给互感器校验仪作 为工作电流， 设工作电流为 ， 此电流的相位和相应电流互感器一次端施加电压 的相位一致， 这样可以直接通过互感器校验仪直接测量出高压漏电流在 1 %额定 电流点对电流互感器的误差影响量。当工作电流 Ί从互感器校验仪 TO端钮输入， 被测高压漏电流 这一小电流从互感器校验仪 K端钮输入， 根据互感器校验仪 电流测差原理可以得到高压漏电流对电流互感器的误差影响量为
式 （1 ) 中， ff为高压漏电流对电流互感器的误差影响量， /为误差影响量 的比差值， ？为误差影响量的角差值， Δ/>为漏电流的同相分量， ΔΛ为漏电流的 正交分量。
以测量 Α 相电流互感器的高压漏电流对其误差影响量为例来说明本发明的 实施方式， 其它相电流互感器采用同样的实施方式进行测量。 参见图 1， 本发明 开展高压三相互感器漏电流对电流互感器误差影响量的测量时，通过三相升压器 产生对称的额定三相高电压， 然后加在三相互感器上的 A、 B、 C 三个高压端子 上， 同时将三相互感器的二次端子应该接地的端子接地。将 A相高压先从 API端 子加， 将二次端子非极性端 as2接地并和电流互感器校验仪 D端相连， 将极性端 as l直接接入电流互感器校验仪 K端， 这样高压漏电流将作为差流电流送入电流 互感器校验仪。 然后同时通过一个升流器和一个电流互感器 T1产生一个与加在 A相上的高电压同相位的电流， 其电流大小为 A相电流互感器二次额定输出的 1 % , 此电流作为电流互感器校验仪工作电流直接送入校验， 即如图 1所示， 将电 流互感器 T1的二次输出端分别和 Τ0、 Τχ相连。这样就可直接通过电流互感器校 验直接测量出三相组合互感器说实际工作额定高压电压所产生的高压漏电流对 A 相电流互感器在 1 %额定电流下的误差影响量。
书

Claims

权 *I 要 求 书
1、 一种高压漏电流对高压三相电流互感器误差影响量的测试方法， 其特征 是， 按以下步骤进行： 通过三相升压器提供三相对称额定电压并施加在高压三相 互感器中电流互感器的一次端子上， 此时， 电流互感器一次绕组不通电流， 二次 绕组短路或者串联额定负荷；
测量时将电流互感器的二次极性端接入电流互感器校验仪的 κ端，二次非极 性端接地并接入电流互感器校验仪的 D端， 使漏电流作为差流输入互感器校验 仪； 同时通过升流器和试验用电流互感器 T1提供 1 %二次输出额定电流给电流 互感器校验仪作为工作电流，该额定电流的相位与上述电流互感器一次端子所施 加电压的相位一致， 通过电流互感器校验仪直接测量出高压漏电流在 1 %额定电 流点对高压电流互感器的误差影响量；
上述试验用电流互感器 T1的二次输出端 Kl、 Κ2分别和电流互感器校验仪的 工作电流输入端 Τ0、 Τχ相连接。
2、 根据权利要求 1所述的高压漏电流对高压三相电流互感器误差影响量的 测试方法， 其特征是， 所述施加三相对称额定电压的电流互感器一次端子为 P1 端子或 Ρ2端子。
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