Current monitoring device

Abstract

The invention discloses a current monitoring device which comprises a first current bar main current bearing copper bar and a Hall sensor arranged on the first current bar main current bearing copper bar. The current monitoring device further comprises a second current bar arranged on the outer surface of the first current bar. The Hall sensor detects current which passes through the second current bar. The current monitoring device can measure the current accurately, at the same time lower cost and keep high stability.

Description

technical field [0001] The invention relates to current monitoring devices. Background technique [0002] In the current low-voltage electrical appliances, three-stage protection (LSI), namely, overload long-time delay protection, short-circuit short-time delay protection and short-circuit transient protection, can be used to realize safe operation of the power distribution system. However, the traditional way to realize LSI protection usually uses a bimetallic strip and a solenoid. The accuracy of the monitoring current is poor, and the current level cannot be adjusted, and the cooperation between the upper and lower levels is not very accurate. Moreover, in the terminal power distribution system, the problem of leapfrog tripping usually occurs, so that the continuity of power supply cannot be guaranteed. [0003] A conventional current transformer is generally constructed so that a copper bar passes through a Hall sensor to monitor the current flow. However, since the D...

AI Technical Summary

Problems solved by technology

However, since the DC three-stage protection in low-voltage power distribution needs to protect a wide range of currents to achieve overload protection, short-circuit short-delay protection, and short-circuit instantaneous protection, the range of measurement current accuracy must be large.

For example, for a 1250A rated current circuit breaker, the protection current range needs to be from 600A to 36kA. The existing Hall sensor cannot monitor such a wide range, and the Hall sensor is often damaged or the entire current transformer cannot function. , so the Hall sensor is mostly used to measure the rated current

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