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Test mutual inductor for protecting device against electric ground leakage and protecting device against electric ground leakage

A leakage protection device and transformer technology, applied in emergency protection devices, inductors, switches operated by ground fault current, etc., can solve problems such as difficult power circuits, heating of protection devices, and inaccurate fault current measurement.

Inactive Publication Date: 2002-12-25
SCHNEIDER ELECTRIC IND SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This situation leads to bulky power circuits that are difficult to be compatible with small size modular protection devices
In addition, the high electrical power used for the excitation causes significant heating of the protective device
The application of high electrical power also means that the measurement of very weak fault currents is not very accurate

Method used

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  • Test mutual inductor for protecting device against electric ground leakage and protecting device against electric ground leakage
  • Test mutual inductor for protecting device against electric ground leakage and protecting device against electric ground leakage
  • Test mutual inductor for protecting device against electric ground leakage and protecting device against electric ground leakage

Examples

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Embodiment Construction

[0046] figure 1 The earth-leakage protection device shown in includes an earth-leakage fault current detection transformer 1 comprising a magnetic circuit 2 in the form of a toroidal core and a secondary winding 3 connected to a processing circuit 4 . The transformer 1 surrounds a conductor 5 in the power system or as part of the power system to be protected. The processing circuit 4 receives the measurement signal from the transformer 1 and commands the opening of a trip relay 6 in order to open the electrical contacts arranged in series with the conductor 5 . When the protective device is not powered by the system, a power circuit 8 arranged between the power line and the circuit 4 supplies the power required for measuring and processing a signal If representative of the earth-leakage fault current.

[0047] If the earth leakage fault current is a pulsed DC current or represents a DC component, an excitation circuit is used to excite the windings of the current transformer....

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Abstract

The detection transformer which is used with excitation and processing units is toroidal and contains the protected conductors. The transformer magnetic circuit is based on iron with crystals which do not exceed 100 nanometers in thickness and has a static or low frequency magnetic cycle (21) which is virtually rectangular. The coercive force (Hc) in the magnetic cycle is preferably less than 1.5 Amperes / meter. An Independent claim is also included for a differential protection equipment which uses the detection transformer and magnetic circuit.

Description

technical field [0001] The invention relates to a detection transformer in the form of an annular iron core for detecting earth leakage fault current, which is used for an earth leakage protection device sensitive to AC, DC or periodic earth leakage fault current. [0002] The protective devices include: [0003] an excitation circuit connected to at least one secondary winding in said detection transformer for applying an excitation signal, [0004] a processing circuit, connected to the secondary winding, [0005] A power circuit is connected to the excitation circuit and the processing circuit. [0006] The invention also relates to an earth leakage protection device comprising such a transformer. Background technique [0007] Existing earth leakage protection devices include detection transformers in the form of ring cores for detecting AC fault currents. These devices are either powered by the system or they operate from an auxiliary voltage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R15/18G01R29/20
CPCG01R15/185G01R29/20
Inventor 克里斯蒂尔·朱雷斯齐克西蒙·蒂安马克·波珀特
Owner SCHNEIDER ELECTRIC IND SAS
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