Transformer grounding current monitoring device and system

Abstract

The invention discloses a transformer grounding current monitoring device and system. The transformer grounding current monitoring device comprises a metal shell, an annular core and an ammeter connected to a secondary side of the annular core, wherein the annular core and the ammeter are arranged in the metal shell, one end of a primary side of the annular core is connected with a grounding down conductor of a transformer, the other end of the primary side of the annular core is connected with a corresponding grounding point of the transformer, and the number of turns of a coil on the secondary side of the annular core is smaller than that of a coil on the primary side of the annular core. According to the transformer grounding current monitoring device, it is ensured that electrical connection is good; due to the fact that metal shielding is adopted in the metal shell, it is ensured that leakage flux does not penetrate, the measuring error is reduced, and accuracy of measurement is ensured.

Description

technical field [0001] The invention relates to the field of transformers, in particular to a transformer grounding current monitoring device and system. Background technique [0002] The ground current test of transformer iron core or transformer clamp is an important part of transformer monitoring. By testing the ground current of transformer core / clamp, it can effectively find the occurrence of multi-point ground faults in the iron core. [0003] The current method for testing the ground current of the transformer core / clamp is that the staff carry a high-precision clamp ammeter (hard jaw) to conduct the test offline. There is no problem with the accuracy of the clamp ammeter, but too large a window will cause a large measurement error. Moreover, the measured current values ​​vary greatly depending on the position of the jaws of the ammeter. The reason for the analysis is that the jaws are not closed properly after opening, and the iron core of the clamp ammeter is not w...

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Problems solved by technology

There is no problem with the accuracy of the clamp ammeter, but too large a window will cause a large measurement error

Moreover, the measured current values ​​vary greatly depending on the position of the jaws of the ammeter. The reason for the analysis is that the jaws are not closed properly after opening, and the iron core of the clamp ammeter is not working normally. The second is that the leakage flux of the transformer passes through The ammeter clamps the window, distorting the measured data

[0004] At present, the clamp ammeter has been improved, and the hard jaw is transformed into a soft jaw, and it is combined with an ordinary multimeter. Although the test is greatly facilitated, the jaw cannot be easily adjusted, and the leakage flux still causes considerable damage. large measurement error

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