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Analogue electronic trip device for an electrical power breaker responding to a short-circuit

A tripping device, analog electronics technology, applied in the direction of circuit devices, emergency protection circuit devices, parts of emergency protection devices, etc., can solve problems such as difficult to reach, small tripping delay, etc., and achieve the effect of low loss

Inactive Publication Date: 2005-07-20
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strong coupling of the two tripping branches under this condition makes it difficult to achieve the very small tripping delay required in the event of a short circuit

Method used

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  • Analogue electronic trip device for an electrical power breaker responding to a short-circuit
  • Analogue electronic trip device for an electrical power breaker responding to a short-circuit
  • Analogue electronic trip device for an electrical power breaker responding to a short-circuit

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Experimental program
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Embodiment Construction

[0025] exist figure 1 The time and current are shown on a logarithmic scale in a known manner in the curve of . At currents greater than the rated current I N The overload zone LT in which a large tripping delay (from minutes to hours) occurs starts at . In the following short time delay region ST, the tripping time is an instant in seconds. Delays are determined for both segments LT and ST of the tripping characteristic curve by the microprocessor-based electronic trip unit. greater than the boundary value I K A current of 0 is considered a short circuit and requires the power switch to trip with as short a delay as possible to avoid damage to the protected equipment and the power switch itself. As mentioned at the beginning, an analog electronic circuit is used for this undelayed tripping.

[0026] figure 2 The simulated electronic tripping device for short circuit of the present invention is shown in a simplified schematic circuit diagram. The switching contacts 1 ,...

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PUM

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Abstract

The invention relates to a trip device for an electrical power breaker (LS), for tripping on a short-circuit and embodied as an analogue electrical circuit. The circuit components and devices necessary for tripping on a short circuit form a discrete module, completely independent of other trip devices on the power breaker (LS). A direct current is provided by transformers (6, 7, 8) together with rectifiers (9, 10, 11) which flows through a power semiconductor (12) switched to conduct in the normal operating state of the power breaker (LS). A measurement and control circuit (13) is controlled by means of a voltage generated across a measuring resistance (14) through which the direct current flows and closes the power semiconductor (12) when a threshold value is exceeded. The current is then commutated from the power semiconductor (12) to the trip magnet (5) which opens the switch contacts (1, 2 and 3) with a particularly small delay.

Description

technical field [0001] The invention relates to an analog electronic tripping device for responding to a short circuit of an electric power switch, having [0002] - a current converter for picking up the current flowing through the circuit monitored by the power switch, [0003] - tripping magnet for releasing the switching contacts of the power switch, [0004] - a threshold circuit for issuing a switching command to the trip magnet when the collected current exceeds a limit value, [0005] - supply circuit for operating the tripping device and tripping magnet. Background technique [0006] A tripping device of this type is known from US 4733321 (=EP 0244284B1). Together with another tripping device for overload monitoring, this tripping device forms a comprehensive protection device for the power switch against the most frequent faults in the operation of electrical installations. In this case, separate current converters and different circuit arrangements are used to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H1/00H02H1/06
CPCH02H1/0007H02H1/063
Inventor 亨利·弗兰克尤维·诺埃尔利希马克·利布特鲁斯安德烈亚斯·潘克沃尔夫冈·罗尔
Owner SIEMENS AG