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Method and device for monitoring a protective earth connection

A technology of protective grounding and measurement protection, which is applied in the direction of testing electrical devices, measuring devices, continuity testing, etc. during transportation, and can solve the problems of complicated reliable detection of test current and inaccurate evaluation of current.

Active Publication Date: 2019-11-01
BENDER SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Furthermore, the measurement of the current in the protective earth can lead to an inaccurate evaluation, since the above-mentioned interference superimposes itself on the actual test current and complicates the reliable detection of the test current

Method used

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  • Method and device for monitoring a protective earth connection

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Embodiment Construction

[0035] In the schematic, figure 1 An application of the method according to the invention is shown, including an embodiment of a monitoring device 2 implementing the method using an example for a shore connection of a vessel 4 .

[0036] The vessel 4 is connected to the feed point 3 via the load side connection 5 and the power feeder 6 to the mains power supply. The load-side connection 5 further comprises a monitoring conductor 8 and a protective earth (protective earth connection) 10 . The feed point 3 is provided with a ground connection 12 .

[0037] The monitoring device 2 arranged at the feeding point 3 comprises a test current generator 14 for generating a test current 17, a coupling circuit 16 for injecting the test current 17 into the monitoring conductor 8, and a coupling circuit 16 for the protective earth 10 The connection device 18 for the connection of the measuring current transformer 20 for the current measurement, the evaluation device 22 for evaluating the ...

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Abstract

The invention relates to a method and a device for monitoring the protective earth connection of an electric power feeder using a monitoring conductor, the feeder extending between a feed point with an earth connection and a load-side connection, the feed between the monitoring conductor and the earth connection Inject test current at the point. The injected test current has a characteristic time course that can be clearly distinguished from the current flowing on the protective earth during operation, the protective earth current is measured on the feeding side, and the measured protective earth current is evaluated to detect an interruption of the protective earth. On the one hand, the basic idea of ​​the invention is based on the fact that the injected test currents generated by active measurement methods have a course that can be clearly distinguished from other currents flowing on the protective earth, and on the other hand, in combination with the evaluation of the measured protective earth current , the current measurement takes place optionally on the feeder side in the protective earth to be monitored.

Description

technical field [0001] The invention relates to a method for monitoring the protective earth connection of an electric power feeder using a monitoring conductor, the feeder extending between a feed point with an earth connection and a load-side connection, the method comprising generating a test current and switching between the monitoring conductor and earth Method steps for injecting a test current at a feed point between connections. [0002] Furthermore, the invention relates to a device for monitoring the protective earth connection of an electric power feeder extending between a feed point with an earth connection and a load-side connection using a monitoring conductor, the device comprising a test current for generating a test current A current generator and a coupling circuit for injecting a test current at the feed point between the monitoring conductor and the ground connection. Background technique [0003] Loop monitoring devices are known for monitoring loop re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02G01R19/165
CPCG01R31/008G01R31/52G01R31/54
Inventor 贝恩德·海尤瑟林
Owner BENDER SA