Method and device for monitoring a protective ground connection

摘要

A method and a device are for monitoring a protective ground of an electrical feeder using a monitoring conductor, the feeder extending between a feeding point having a grounding connection and a load-side connection, and a test current injected at the feeding point between the monitoring conductor and the grounding connection.;The injected test current has a characteristic temporal progression distinguishable from the currents running on the protective ground, the protective ground current measured at the feeding side and the measured protective ground current evaluated to detect an interruption of the protective ground.;The injected test current, which is generated by the active measuring method, has a progression distinguishable from the other currents running on the protective ground. On the other hand, a current measurement takes place selectively on the feeding side in the protective ground to be monitored in conjunction with an evaluation of the measured protective ground current.

主权项

1. A method for monitoring a protective ground (10) of an electrical feeder (6) using a monitoring conductor (8), the feeder (6) extending between a feeding point (3) having a grounding connection (12) and a load-side connection (5), comprising the method steps of:
generating a test current (17), injecting the test current (17) at the feeding point (3) between the monitoring conductor (8) and the grounding connection (12), characterized in that the injected test current (17) has a characteristic temporal progression that can be clearly distinguished from currents running on the protective ground (10) during operation, a protective ground current (24) is measured at the feeding side, and the measured protective ground current (24) is evaluated so as to detect an interruption of the protective ground.