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Apparatus and method for ground fault detection

A technology of ground fault and detection device, applied in measurement device, short-circuit test, transportation and packaging, etc., can solve the problems of small current and difficulty in providing suitable fuse, etc., to achieve the effect of enhanced safety

Inactive Publication Date: 2020-01-10
OTIS ELEVATOR CO
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the current flowing through each segment may be so small that it is difficult to provide a suitable fuse that will blow within the required time period in the event of a ground fault

Method used

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  • Apparatus and method for ground fault detection
  • Apparatus and method for ground fault detection
  • Apparatus and method for ground fault detection

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Embodiment approach

[0036] A number of optional features are set forth below. These features can be achieved individually or in combination with each other in specific embodiments.

[0037] In one embodiment, at least one of said supply line current monitoring unit, said return line current monitoring unit and said comparison unit comprises at least one microprocessor. A unit comprising at least one microprocessor can be easily adapted to actual needs by changing and / or modifying the program running on the microprocessor. Therefore, production and maintenance costs can be reduced.

[0038] In one embodiment at least one of said supply line current monitoring unit, said return line current monitoring unit and said comparison unit comprises at least two redundant microprocessors. This increases operational safety, since any malfunction of one of the microprocessors can be compensated for by the additional microprocessor.

[0039] In one embodiment at least one of said supply line current monitor...

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Abstract

A ground fault detection apparatus (32) for detecting a ground fault of a safety chain (10b; 10c; 10d), in particular a safety chain (10b; 10c; 10d) of a people conveyor, comprises: a supply line current monitoring unit (26), which is configured for measuring a current flowing into the safety chain (10b; 10c; 10d) and providing a first signal indicative of the amount of current flowing into the safety chain (10b; 10c; 10d); a return line current monitoring unit (28), which is configured for measuring a current flowing out of the safety chain (10b; 10c; 10d) and providing a second signal indicative of the amount of current flowing out of the safety chain (10b; 10c; 10d); and a comparison unit (30), which is configured for comparing the first and second signals and issuing an alarm signal in case the difference between the first and second signals exceeds a predetermined limit.

Description

technical field [0001] The present invention relates to a device and a method for detecting a ground fault of a safety chain, in particular to a device and a method for detecting a ground fault of a safety chain used in a people conveyor. Background technique [0002] People conveyors such as elevators, escalators or moving walks are equipped with safety chains to ensure safe operation. The safety chain typically includes a plurality of safety switches and / or safety circuits interconnected in sequence and is configured to stop any operation of the people conveyor if the safety chain is interrupted by at least one of these safety switches or safety circuits. When such a safety chain encounters a ground fault, ground fault detection is a necessary function for safety chains in people conveyors, as regulated in any elevator safety regulations worldwide. [0003] A ground fault is an undesired connection of a circuit to ground or earth. Currently, ground faults are usually det...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66B5/00B66B13/22
CPCB66B5/0031B66B13/22G01R31/52B66B5/02G01R19/16528G05B9/03G05B19/0425
Inventor P.赫克尔D.泰格特迈尔
Owner OTIS ELEVATOR CO
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