Interchanged additional circuit for split protector current transformer

Abstract

The invention relates to a motor protection circuit, a pump protection circuit, a power capacitor protection circuit, a line protection circuit and the like and aims to provide a series of interchanged additional circuits for a split protector current transformer. An active additional circuit is arranged in the split current transformer, so that the output of each split current transformer has unified and identical standard, each split protector host can be optionally interchanged, the interchange is realized, and the precision is not influenced. The problem that the split protector hosts cannot be interchanged in a split three-phase current transformer is solved, an error caused by loss of a signal on a connecting line between two protectors is avoided, and the interchanged additional circuit is suitable for various split motor protection circuits, pump protection circuits, power capacitor protection circuits, line protection circuits and the like.

Description

technical field [0001] The invention relates to a motor protection circuit, a pump protection circuit, a power capacitor protection circuit, a line protection circuit, in particular to a split type protector current transformer interchangeable additional circuit. Background technique [0002] At present, there are many types of motor protectors, pump protectors, power capacitor protectors, and line protectors, such as integrated and split. The integrated protector is a shell for the protector host, display head and three-phase current transformer. Split type The main body of the protector, the display head and the three-phase current transformer are divided into two or three bodies, and the three-phase current transformer of the split type protector is installed separately from the main body of the protector. The problem is that the three-phase current transformers used for the protector are non-standard products with poor consistency. The precision of the integrated protect...

AI Technical Summary

Problems solved by technology

The problem is that the three-phase current transformers used for protectors are non-standard products with poor consistency. The accuracy of the integrated protector is adjusted by the circuit in the main body of the protector, and the three-phase current transformers of the split protector are all compatible with the main body of the protector. Matching adjustment accuracy, matching production, can not be interchanged, if the exchange will have a large error, it will not be able to achieve the proper protection effect, the supporting three-phase current transformer must be replaced together when the host of the protector is replaced, especially for large current The three-phase current transformer is difficult to install and even more difficult to replace, which brings a lot of inconvenience to the user, the manufacturer's process debugging is also relatively cumbersome, and the stocking volume of the supply and demand sides also increases.

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