CN203278215U

CN203278215U - Secondary overvoltage protector for current transformer

Info

Publication number: CN203278215U
Application number: CN 201320031696
Authority: CN
Inventors: 李青
Original assignee: HEFEI LONGKE ELECTRIC POWER EQUIPMENT CO Ltd
Current assignee: HEFEI LONGKE ELECTRIC POWER EQUIPMENT CO Ltd
Priority date: 2013-01-22
Filing date: 2013-01-22
Publication date: 2013-11-06
Anticipated expiration: 2023-01-22

Abstract

The utility model provides a secondary overvoltage protector for a current transformer and relates to the technical field of overvoltage-absorbing in an electric system. The secondary overvoltage protector for the current transformer comprises a logic control circuit, an overvoltage detecting circuit and a silicon controlled protection apparatus. A terminal of the logic control circuit is connected with a terminal of the silicon controlled protection apparatus and a terminal of the current transformer, and the other terminal of the logic control circuit is connected with a terminal of circuit loads; and the other terminal of the silicon controlled protection apparatus is connected with a terminal of the overvoltage detecting circuit and the other terminal of the current transformer, and the other terminal of the overvoltage detecting circuit is connected with the other terminal of the circuit loads. The overvoltage inhibition apparatus for a system has the advantages of fast motion speed, high overload capability and small static state leakage current, and meets protection requirements for various current transformers.

Description

The Current Transformer Secondary overvoltage protection device

Technical field

The utility model relates to Hyper-Voltage of Power Systems absorption techniques field, relates in particular to a kind of Current Transformer Secondary overvoltage protection device.

Background technology

Current transformer is applied to one-shot measurement and control widely in electric power system, if the secondary winding open circuit occurs in current transformer in running or first side winding flows through abnormal current, as thunderbolt, resonance current, electrothermal charging current etc., the capital produces the high pressure of thousands of volts volts even up to ten thousand at secondary side, not only insulation works the mischief to electrical secondary system for this, goes back entail dangers to staff's life.

Summary of the invention

The purpose of this utility model is to provide a kind of Current Transformer Secondary overvoltage protection device, its quick action, and overload capacity is strong, and static leakage currents is little, can satisfy the protection demand of various current transformers.

In order to solve existing problem in background technology; the utility model is by the following technical solutions: it comprises logic control circuit, overvoltage detection circuit, thyristor protection device; described logic control circuit one termination thyristor protection device one end summation current transformer one end; other end connection circuit load one end; the thyristor protection device other end is taken over the voltage detecting circuit one end summation current transformer one end other end, the overvoltage detection circuit other end connection circuit load other end.

Current Transformer Secondary overvoltage protection device of the present utility model is mainly used in the abnormal overvoltage protection of various CT secondary sides, protector is fixed in CT secondary winding two ends, during normal operation, leakage current is minimum, be high-impedance state, when CT secondary circuit open circuit or an abnormal overcurrent of winding appearance, the voltage that secondary winding produces is far away higher than normal working voltage, this moment, protector moved and short circuit rapidly, show the position of fault on panel, and have or not the source contact signal to export, after fault is got rid of, by the hand-reset button, normal operation input work again after circuit reinstatement attitude.

System overvoltage restraining device of the present utility model, its quick action, overload capacity is strong, and static leakage currents is little, can satisfy the protection demand of various current transformers.

Description of drawings

Fig. 1 is electrical schematic diagram of the present utility model.

Embodiment

Referring to Fig. 1; a kind of Current Transformer Secondary overvoltage protection device; it comprises logic control circuit, overvoltage detection circuit, thyristor protection device; described logic control circuit one termination thyristor protection device one end summation current transformer one end; other end connection circuit load one end; the thyristor protection device other end is taken over the voltage detecting circuit one end summation current transformer one end other end, the overvoltage detection circuit other end connection circuit load other end.

Claims

1. Current Transformer Secondary overvoltage protection device; it is characterized in that; it comprises logic control circuit, overvoltage detection circuit, thyristor protection device; described logic control circuit one termination thyristor protection device one end summation current transformer one end; other end connection circuit load one end; the thyristor protection device other end is taken over the voltage detecting circuit one end summation current transformer one end other end, the overvoltage detection circuit other end connection circuit load other end.