Novel on-site power meter calibration instrument

A technology for electric energy meters and calibrators, which is applied to instruments, measuring electrical variables, measuring devices, etc., can solve problems such as damaged equipment, no modification found, and inability to truly reflect the magnitude of primary current, so as to improve measurement accuracy and solve measurement differences. Effect

Inactive Publication Date: 2015-07-01
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0003] 1. The energy meter that passed the calibration in the laboratory was found to have a large error in the calibration data at the work site
[0004] 2. There is a large error in the electric energy measurement data between the customer's electric energy meter and the meter installed on the site, and no line modification has been found on site
[0006] The presence of DC components in the load will cause the iron c

Method used

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  • Novel on-site power meter calibration instrument
  • Novel on-site power meter calibration instrument
  • Novel on-site power meter calibration instrument

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Embodiment Construction

[0019] In the clamp ammeter, if there is a DC component in the primary winding of the current transformer, after integration, the magnetic flux will increase until saturation. At this time, the current in the primary winding of the transformer will be used for excitation, and the secondary current of the transformer will be If it is 0, it cannot truly reflect the magnitude of the primary current. Then, theoretically speaking, this problem can be avoided as long as the flux linkage of the current transformer does not enter the saturation region, and this is our solution.

[0020] Based on the above considerations, the principle block diagram of the present invention is as follows figure 1 shown: it includes a clamp-type ammeter provided with an AC-DC detection circuit for detecting the AC-DC current passing through the clamp-type ammeter; and a DC compensation circuit for offsetting the clamp-type ammeter The magnetic flux produced by the DC component.

[0021] In addition, i...

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Abstract

The invention discloses a novel on-site power meter calibration instrument. The novel on-site power meter calibration instrument comprises a tong-type ammeter and a direct-current compensation circuit, wherein an alternating-current/direct-current detection circuit is arranged in the tong-type ammeter and used for detecting alternating current and direct current of the ammeter; the direct-current compensation circuit is used for neutralizing magnetic fluxes generated by direct-current components of the tong-type ammeter. In the calibration instrument, alternating current and direct current passing through the tong-type ammeter are detected by the alternating-current/direct-current detection circuit composed of hall elements; the calibration instrument is driven by the direct-current compensation circuit, and a reverse magnetic flux is injected into the iron core of the tong-type ammeter through compensation coils, so that the magnetic core in the tong-type ammeter cannot be saturated, real errors of a power meter can be accurately measured when the direct-current components are included in loads, the measurement accuracy of the tong-type ammeter is improved, and the actual problem of the measurement difference between an on-site customer power meter and a total measuring meter is solved.

Description

technical field [0001] The invention relates to an electric energy meter calibrator. Background technique [0002] The following phenomena are often found during on-site verification and line inspection: [0003] 1. The electric energy meter that has been calibrated in the laboratory is found to have a large error in the calibration data at the work site [0004] 2. There is a large error in the electric energy metering data between the customer's electric energy meter installed on the site and the total metering meter, and no line modification has been found on the site. [0005] After a lot of data testing and analysis, it is found that the reasons are as follows: [0006] The existence of DC component in the load will cause the iron core of the clamp transformer to enter the saturation region. In theory, the current in the primary winding of the transformer will be used for excitation, and the secondary current of the transformer is 0, which cannot truly reflect the pri...

Claims

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Application Information

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IPC IPC(8): G01R35/04
Inventor 程瑾陈其俊李群仙倪卫星刘沛吴征兵朱臻陈旭霞章袆炜陈亮吴晟郑智翰
Owner STATE GRID CORP OF CHINA
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