Electronic less/over-voltage protective device for low-voltage circuit breaker and control method thereof

A technology of overvoltage protection device, low voltage circuit breaker, applied in the direction of automatic disconnection emergency protection device, emergency protection circuit device, protection reacting to overvoltage, etc., can solve voltage failure, stuck, only two wires , can only detect the zero line and the live line or the live line and the live line, etc., to improve the accuracy and ensure the reliability.
CN101414743AInactive Publication Date: 2009-04-22TIANJIN BAILI ELECTRIC CO LTD
0 Cites 11 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
TIANJIN BAILI ELECTRIC CO LTD
Publication Date
2009-04-22
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
Patent Text Reader

Abstract

The present invention relates to a low-voltage circuit breaker electronic undervoltage and overvoltage protection device and a control method. The device consists of voltage transformers of A, B, C, N phases on the incoming end of an acquisition circuit breaker, a precise operational amplifier, an electronic strobe switch, a single-chip microcomputer, a relay and a circuit breaker executive mechanism. Voltage transformers of A, B, C phases input a voltage signal to the input ports of the precise operational amplifier; the precise operational amplifier inputs the signal after the treatment to the I / O port of the single-chip microcomputer through the electronic strobe switch; the single-chip microcomputer measures the signal of each phase and compares with the qualified range value in a logic program; if one phase signal is not qualified, the single-chip microcomputer outputs the signal to the relay through the I / O port; the NC node of the relay is connected to a switch opening executive mechanism of the relay. The intelligent device with the microprocessor as the core, plus the control flow procedures of the microprocessor, can improve the sampling precision and ensure the action reliability of low-voltage circuit breaker.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to a circuit breaker, in particular to an electronic undervoltage and overvoltage protection device and a control method for a low-voltage circuit breaker. Background technique

[0002] my country's low-voltage electrical appliances have experienced many years of development history, and have made a qualitative leap from functional categories to quality characteristics. Short-circuit and overload protection are the traditional protection forms of low-voltage electrical appliances. Voltage protection is not very important. Some lines only protect against undervoltage, but undervoltage and overvoltage faults also cannot make the load work reliably. The traditional undervoltage release is realized by the electromagnetic system, and the moving iron core is controlled by the gain and loss of the electromagnetic coil, thereby controlling the action of the circuit breaker. This structure has two disadvantages. One is that it is installe...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More