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Improved circuit monitoring equipment

A circuit and equipment technology, applied in the field of improvement of circuit monitoring equipment, can solve problems such as high power consumption, and achieve the effects of stable current, less power consumption, and easy monitoring

Inactive Publication Date: 2004-01-21
阿雷瓦T＆D英国有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] It is an object of the present invention to ameliorate the problems associated with high power dissipation across resistive elements

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0035] figure 2 A schematic diagram of a trip protection circuit incorporating a trip circuit supervisory circuit according to the present invention is shown.

[0036] The trip circuit comprises a normally open protective trip relay contact 101 in series with a trip coil 102 of the circuit breaker in line 103 between positive and negative DC power sources 104,105. The trip coil opens the circuit breaker contacts (the contacts are normally closed). In the event of a fault on the line protected by the circuit breaker, the protective relay closes the trip relay contact 101, connecting the trip coil 102 to the positive supply. Current in line 103 flows through trip coil 102, operating the circuit breaker to open its contacts.

[0037] For the circuit to work properly, it is important that sufficient current flows through the trip coil when the trip relay contacts close. This relies on the DC supply voltage and its connection to the trip coil.

[0038] A trip circuit must work...

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PUM

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Abstract

A trip circuit supervision circuit is disclosed for use in combination with a trip circuit comprising a circuit breaker trip coil connected in a supply line from a supply voltage and a trip relay contact connected in series with the circuit breaker trip coil. The supervision circuit is connected across the relay trip contact and includes a current sensing device. During normal operation, the supervision circuit draws a constant current from the supply line independent of supply voltage. Thus, changes in the current measured by the current sensing device enable the integrity of the supply voltage to be checked.

Description

technical field [0001] This invention relates to improvements in circuit monitoring equipment, and more particularly to improved equipment for monitoring the integrity of tripped circuits and the presence of circuit power. This device is especially useful for monitoring conditions that prevent energization of unenergized circuits, such as circuit power failures. Background technique [0002] Circuit breakers are known to open portions of the high voltage (relatively high) circuit in response to the closure of a contact (trip contact) connected to the low voltage circuit. The trip contact and the supply voltage form part of the trip circuit. Therefore, a circuit breaker includes a trip coil and circuit breaker contacts. Closing the trip contacts causes current to flow in the trip coil of the circuit breaker, which causes the circuit breaker to open and the high voltage circuit to open. When a fault occurs in a high voltage circuit, it is important that the circuit breaker ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H1/06H02H3/04H02H3/05H02H3/24
CPCH02H1/06H02H3/04H02H3/05H01H47/002H02H3/243
Inventor B·I·爱德华斯
Owner 阿雷瓦T＆D英国有限公司