KR100321252B1 - electronic surge suppressor-typed over-current relay - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic surge sprayer type overcurrent relay, and is a digital signal processing technology using a microcomputer to supply and control a surge of several to several tens of times the internal and external temporary rated voltage with a stable sine wave. They can save power by preventing malfunction, failure, life extension and unnecessary overvoltage. To this end, the electronic surge pressure type overcurrent relay, the input port for receiving a voltage and current; A sensor unit for detecting various abnormal noises associated with voltage and current input to an input port; A signal filter that senses a signal from the sensor unit and amplifies the signal to increase the accuracy of signal processing; A phase detector for detecting a phase of the sensor; A central processing unit for comparing and analyzing various abnormal noises such as overcurrent, reversed phase, imaging, inequality, and short circuit detected by the sensor unit based on a signal and a set value received from an input port and a sensor phase detection value by a phase detector; An output unit which receives a signal analyzed by the central processing unit and displays the value; And a surge suppressor for controlling the transient surge of the voltage and current input from the input port and preventing unnecessary overvoltage.

Description

Electronic surge suppressor-typed over-current relay

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic surge sprayer type overcurrent relay. More particularly, the digital signal processing technology using a microcomputer provides a stable sine wave to control a surge of several to several tens of times of internal and external temporary rated voltage. The present invention relates to an electronic surge suppressor type overcurrent relay that can reduce power by preventing malfunction, failure, life extension, and unnecessary overvoltage.

In general, all electrical appliances used in factories, homes, etc. are connected to each other by an electric wire from a generator, through a transformer, and a distribution board to form a large network. The ride extends directly to us, and as today's electrical products diversify, various phenomena in use affect other devices on the wire without their knowledge.

These various phenomena include overcurrent, reversed phase, phase loss, inequality, short circuit, ground fault, restraint function and surge.

The causes of surges are frequent and innumerable in many places, such as light switches that are inadvertently turned off and on, when lightning strikes a wire, when they are removed during high frequency processing. do.

A relay is an equipment that opens or closes an electric circuit according to various input signals such as temperature and light, as well as electric signals such as voltage, current, power, and frequency. There are many types of relays, and they are divided into contact relays such as electromagnetic relays and solid state relays such as semiconductor relays (transistor relays and SCR relays) according to the physical phenomenon used when converting an input signal into circuit opening and closing. Depending on the function and structure, they are classified into circular relays, balanced relays, reed switches, and wire spring relays. Since relays have a wide range of uses, including telephone exchanges and general control, it is necessary to satisfy conditions such as high reliability, long life, and high sensitivity, and lightweight miniaturization for miniaturizing equipment is being promoted.

The effect of the surge on the device is that the surge generated at the time of simple on-off of the device is from several times to several hundred times the rated voltage, and the voltage and current flowing in the sine wave are suddenly turned off to generate a high crest pulse. In turn, the pulses take energy and flow into the ride, overheating and destroying the device.

A general relay is a simple device designed to operate when the input current exceeds a set value, and has protected AC power equipment with functions such as overcurrent, reverse phase, phase loss, inequality, and short circuit, but these relays form a huge network and are connected to each other. It is very vulnerable to surges that appear in the intended use of electricity.

That is, the conventional relay has a problem that it is very weak when a surge occurs because there is only an overcurrent, reverse phase, phase loss, inequality, short circuit, restraint function, and there is no surge function. Therefore, the power supply equipment malfunctions or breaks down, and the lifespan thereof is reduced and power loss is enormous.

Therefore, the present invention has been made to solve the above problems, by using a digital signal processing technology using a microcomputer AC by controlling a stable sine wave to supply a surge several times to several tens of times the internal and external temporary rated voltage It is to provide electronic surge suppressor type overcurrent relay that can reduce power supply with malfunction, failure prevention, life extension and unnecessary overvoltage protection.

1-Schematic diagram of a device equipped with an electronic surge pressure type overcurrent relay according to the present invention.

2-a detailed configuration diagram of FIG.

3-2 is a detailed configuration diagram of the electronic surge pressure type overcurrent relay mounted in FIG.

In accordance with an aspect of the present invention, an electronic surge pressure type overcurrent relay includes: an input port configured to receive a voltage and a current; A sensor unit for detecting various abnormal noises associated with voltage and current input to an input port; A signal filter that senses a signal from the sensor unit and amplifies the signal to increase the accuracy of signal processing; A phase detector for detecting a phase of the sensor; A central processing unit for comparing and analyzing various abnormal noises such as overcurrent, reversed phase, imaging, inequality, and short circuit detected by the sensor unit based on a signal and a set value received from an input port and a sensor phase detection value by a phase detector; An output unit which receives a signal analyzed by the central processing unit and displays the value; And a surge suppressor for controlling the transient surge of the voltage and current input from the input port and preventing unnecessary overvoltage.

Here, the central processing unit preferably has an A / D converting function, a measurement processing function, a memory processing function, and a protection processing function. More preferably, the electronic surge compressor type overcurrent relay further includes a rectifier for rectifying the signal output from the signal filter and transmitting the rectified signal to the central processing unit.

As a result, the digital signal processing technology using microcomputer controls the supply of surges of several to several tens of times of internal and external temporary rated voltage as stable sine wave, thereby preventing AC power equipment from malfunctioning, preventing failure, extending life, and unnecessary overvoltage. Prevention can save power.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a schematic configuration diagram of a device equipped with an electronic surge pressure type overcurrent relay according to the present invention, FIG. 2 is a detailed configuration diagram of FIG. 1, and FIG. 3 is an electronic surge pressure type overcurrent relay mounted in FIG. 2. Detailed configuration diagram of. As shown in these figures, the electronic surge sprayer type overcurrent relay according to the present invention is usually mounted on the circuit of the device, and can check whether there is an abnormality in the current and voltage applied to the main operating part, for example, a motor. It is supposed to be.

The electronic surge pressure type overcurrent relay described above is largely composed of an input unit, a central processing unit, and an output unit.

The input unit is an input port which is responsible for receiving voltage and current from the outside, a sensor unit which detects various abnormal noises accompanying the voltage and current inputted to the input port, and a signal from the sensor unit to detect the accuracy of signal processing It consists of a signal filter for amplifying the signal to increase the signal, and a phase detector for detecting the phase of the sensor.

The input port has a general port shape, and the sensor unit is composed of a current transformer (C.T) and a zero-current transformer (Z.C.T). C.T is a sensor that can detect various kinds of noise and overcurrent, and Z.C.T is a sensor that can detect overcurrent entirely. These sensors send the detected signal to a signal filter.

At the rear of the signal filter, a rectifier is provided for rectifying the signal output from the signal filter and transmitting the signal to the central processing unit. The rectifier constitutes an element of the input unit.

The central processing unit can compare and analyze various abnormal noises such as overcurrent, reversed phase, phase loss, inequality, and short circuit detected by the sensor unit based on the signal received from the input port and the set value and the sensor phase detection value by the phase detector. It is. The central processing unit is equipped with various functions, and has A / D converting function, measurement processing function, memory processing function and protection processing function. In addition, the central processing unit is provided with a separate power supply, so that the power can always be supplied. The central processing unit compares the input signal and transmits the value to the output unit.

The output unit receives the signal analyzed by the central processing unit and displays the value. The output section is composed of a function selection section, a self-diagnosis section, a display section, an output relay section, and the like, so as to properly display the signals analyzed by the central processing section.

An electronic surge suppressor type overcurrent relay having the above structure is equipped with a surge suppressor which is the subject of the present invention. In more detail, the surge suppressor is installed at the rear of the sensor unit in the input unit to detect an overvoltage and surge that is not detected by the sensor unit.

Thus, the surge suppressor can control the transient surge of the voltage and current input from the input port and prevent unnecessary overvoltage.

Hereinafter, the operation and effects of the electronic surge sprayer type overcurrent relay according to the present invention will be described.

The electronic surge sprayer type overcurrent relay mounted on the front of the motor checks for abnormality of current and voltage applied to the motor or the like.

When voltage and current are input from the outside through the input port of the input unit, the sensor unit, that is, CT and ZCT, detects various noises and overcurrents associated with the input voltage and current, and transmits the detected value to the signal filter. .

The voltage and current passing through the sensor unit pass through the surge suppressor again, and the surge suppressor controls the transient surge of the voltage and current and prevents unnecessary overvoltage.

Thus, the input voltage and current is passed through the signal filter to the rectifier. When voltage and current are transmitted from the signal filter to the rectifier, the phase detector detects the phase of the sensor and transmits the value to the central processing unit.

Therefore, the central processing unit compares and analyzes various abnormal noises such as overcurrent, reversed phase, phase loss, inequality, and short circuit detected by the sensor unit based on the signal received from the input port and the set value and the sensor phase detection value by the phase detector. do.

Then, the values analyzed by the central processing unit are transmitted to the output unit and displayed properly.

Therefore, the gist of the present invention is not only the various noises accompanying the input voltage and current by attaching a surge suppressor having a surge protection function to the relay as compared to a relay which does not have the function of preventing a sudden surge occurring conventionally. In particular, it is the thing which can block a surge effectively.

As a result, the digital signal processing technology using microcomputer controls the supply of surges of several to several tens of times of internal and external temporary rated voltage as stable sine wave, thereby preventing AC power equipment from malfunctioning, preventing failure, extending life, and unnecessary overvoltage. Prevention can save power.

As described above, according to the electronic surge pressure type overcurrent relay according to the present invention, a digital signal processing technique using a microcomputer is used to control a surge of several to several tens of times the internal and external temporary rated voltage to a stable sine wave. By supplying AC power equipment, power can be saved by preventing malfunction, failure, life extension and unnecessary overvoltage.

Claims (3)

In the electronic surge sprayer type overcurrent relay, An input port for receiving a voltage and a current; A sensor unit detecting various abnormal noises associated with voltage and current input to the input port; A signal filter which senses a signal from the sensor unit and amplifies a signal for increasing the accuracy of signal processing; A phase detector for detecting a phase of the sensor; A central processing unit for comparing and analyzing various abnormal noises such as overcurrent, reversed phase, phase loss, inequality, short circuit and the like detected by the sensor unit based on the signal and setting value received from the input port and the sensor phase detection value by the phase detector. ; An output unit which receives the signal analyzed by the central processing unit and displays the value; And And a surge suppressor for controlling a transient surge of voltage and current input from the input port and preventing unnecessary overvoltage. The electronic surge pressure type overcurrent relay of claim 1, wherein the central processing unit has an A / D converting function, a measurement processing function, a memory processing function, and a protection processing function. The electronic surge suppressor of claim 1 or 2, wherein the electronic surge pressure type overcurrent relay further comprises a rectifier for rectifying the signal output from the signal filter and transmitting the rectified signal to the central processing unit. Pressure type overcurrent relay.