Transformation combined junction box with changeable phase sequence

Abstract

The invention provides a transformation combined junction box with the changeable phase sequence. The transformation combined junction box comprises a box body, a box cover and a circuit board located in the box body. An upper terminal set of a first terminal set and an upper terminal set of a second terminal set each comprise a left voltage upper terminal, a right voltage upper terminal, a left current upper terminal and a right current upper terminal, all of which are arranged in parallel. The voltage upper terminals of the first terminal set and the second terminal set are electrically connected in an intersection mode. Current upper terminals corresponding to the first terminal set and the second terminal set are electrically connected in an intersection mode. A diverter switch is arranged between each voltage lower terminal and the two voltage upper terminals corresponding to the voltage lower terminal, a diverter switch is arranged between each current lower terminal and two current upper terminals corresponding to the current lower terminal, and the diverter switches are in linkage through insulating linkage rods. The transformation combined junction box has the advantages that when the inverse phase sequence occurs, the phase sequence can be rapidly and safely adjusted by pushing the linkage rods, and equipment hidden danger and the non-attractive technology caused by repeated wiring or crossed wiring are avoided.

Description

technical field [0001] The invention relates to a metering device for high-voltage supply to low-voltage, in particular to a variable-phase-sequence variable-voltage combined junction box. Background technique [0002] The electric energy metering device is composed of three parts: the electric energy meter, the transformer (current transformer, voltage transformer), and the secondary circuit from the electric energy meter to the transformer. By installing the combined junction box and the secondary circuit (voltage secondary circuit and current secondary circuit) joint wiring of the electric energy meter, it is possible to conveniently and safely check the electric meter on site when it is under load, and disassemble and install the meter under the charged state to ensure During the operation process, the open circuit of the secondary circuit of the current and the short circuit of the secondary circuit of the voltage can be prevented, and the economic loss caused by t...

AI Technical Summary

Problems solved by technology

However, the problem of reverse phase sequence is prone to occur in the combined wiring, and the interchanged wiring will inevitably cause the crossover of the wires, resulting in unclear wiring of the secondary circuit; it is necessary to operate the combined junction box during work, which increases the risk of accidents and may occur when the wiring is interchanged. The confusion of current and voltage lines can lead to serious consequences

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