Anti-DC component current transformer error tester and test method thereof

A current transformer and anti-DC technology, applied in the error tester of anti-DC component current transformer based on half-wave rectification and its testing field, can solve problems such as low inspection efficiency, and achieve wide current range coverage and large output capacity. , the effect of accuracy and stability assurance

Pending Publication Date: 2018-07-13
NANJING DANDICK ELECTRIC INSTR
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention provides an anti-DC component current transformer error tester and its testing method based on half-wave rectification, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem that existing devices cannot be used to measure anti-DC components. The error under the half-wave current of the current transformer can only be confirmed through the test circuit provided by the standard after the installation of the electric energy meter is completed, and there is a problem of low inspection efficiency

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  • Anti-DC component current transformer error tester and test method thereof
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  • Anti-DC component current transformer error tester and test method thereof

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Embodiment 1

[0043] Embodiment 1: as attached figure 1 As shown, the anti-DC component current transformer error tester based on half-wave rectification includes a housing, an anti-DC component current transformer test circuit and a data processing unit, and the anti-DC component current transformer test circuit and data processing unit are both Set in the casing, the anti-DC component current transformer test circuit includes a voltage regulator, a current booster, a first rectifier diode D1, a second rectifier diode D2, a current limiting resistor R3, a first half-wave current sampling resistor R1, a second A half-wave current sampling resistor R2, the input end of the voltage regulator is connected to an external AC power supply, the output end of the voltage regulator is respectively connected to the first terminal and the second terminal of the current booster, and the third terminal of the current booster is respectively connected to the The anode of the first rectifier diode D1 conn...

Embodiment 2

[0056] Embodiment 2: as figure 2 Shown, a kind of test method based on the above-mentioned anti-dc component current transformer error tester under half-wave rectification comprises the following steps:

[0057] Step 1, set the primary current, secondary current and secondary load of the anti-DC component current transformer;

[0058] Step 2, collect the primary half-wave current I of the current transformer through the first half-wave current sampling resistor R1 1 , through the second half-wave current sampling resistor R2 to measure the secondary current I 2 , the measurement signal is amplified by the first controllable gain amplifier and the second controllable gain amplifier from 1 to 64 times, and then synchronized to the port of the A / D sampling conversion module, so that the measurement signal is between 1.2V and 2.5V, and the peak voltage is less than 4V , within the linear interval of the A / D sampling conversion module;

[0059] Step 3, use the data processing m...

Embodiment 3

[0077] Embodiment 3: as shown in table 1, adopt the measurement data that the test method of standard current transformer and DC power source obtains to compare with the present invention, measurement data deviation is less than 1 / 3 of current transformer half-wave error limit. Table 1 shows the measurement data of two half-wave rectification error measurement schemes for the same current transformer.

[0078] It can be seen from Table 1 that two different test devices test the same current transformer, and the results obtained are less than 1 / 3 of the error limit of level 3 or level 6 required by the standard, and the performance of the present invention is verified.

[0079] Compared with the detection method of half-wave rectification (DC and even harmonics), according to the analysis of a large number of test data, the fundamental wave ratio difference Δf of qualified current transformers in the state of half-wave rectification is basically between -1.0% and 2.5%. , the an...

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Abstract

The invention relates to the technical field of electric energy measurement, in particular to an anti-DC component current transformer error tester and a test method thereof. The anti-DC component current transformer error tester comprises a casing, an anti-DC component current transformer test circuit and a data processing unit, wherein the anti-DC component current transformer test circuit and the data processing unit are both arranged in the casing; the anti-DC component current transformer test circuit comprises a voltage regulator, a current amplifier, a first rectifier diode, a second rectifier diode, a current-limiting resistor, a first half-wave current sampling resistor, a second half-wave current sampling resistor and the like. According to the anti-DC component current transformer error tester and the test method thereof disclosed by the invention, the voltage regulator and the current amplifier are adopted for amplifying current; half-wave current is outputted by using diode rectification; primary half-wave current and secondary current of the transformer are sampled by adopting a standard resistor; ratio error and phase error of fundamental waves are obtained by adopting a simple reliable amplifying circuit and a high-resolution A/D sampling conversion module. With reasonable circuit design and accurate calculation, the accuracy and the stability of the device areguaranteed.

Description

technical field [0001] The invention relates to the technical field of electric energy measurement, and relates to an anti-DC component current transformer error tester and a testing method thereof. Background technique [0002] The electric energy meter is an important measuring instrument in the electric energy metering device. The country regards the electric energy meter as a mandatory verification item, and needs to verify its error according to JJG596-2012 "Verification Regulations for Electronic AC Electric Energy Meters"; but the verification project does not cover the electric energy meter. All working status. In GB / T 17215.321-2008 "Alternating Current Measuring Equipment, Special Requirements, Part 21, Static Active Energy Meters (Class 1 and Class 2)", the limit value of the influence of half-wave rectification on the error of the energy meter is specified, providing The half-wave rectification test circuit and the content of DC and harmonics are tested. Throug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/02
CPCG01R35/02
Inventor 顾红波
Owner NANJING DANDICK ELECTRIC INSTR
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