KR20170031562A - Apparatus and method for preventing malfunction of digital protection relay - Google Patents

Apparatus and method for preventing malfunction of digital protection relay Download PDF

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Publication number
KR20170031562A
KR20170031562A KR1020150129301A KR20150129301A KR20170031562A KR 20170031562 A KR20170031562 A KR 20170031562A KR 1020150129301 A KR1020150129301 A KR 1020150129301A KR 20150129301 A KR20150129301 A KR 20150129301A KR 20170031562 A KR20170031562 A KR 20170031562A
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KR
South Korea
Prior art keywords
control signal
protection relay
bus line
voltage
generation
Prior art date
Application number
KR1020150129301A
Other languages
Korean (ko)
Inventor
박승기
김경대
김주대
Original Assignee
한국전력공사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 한국전력공사 filed Critical 한국전력공사
Priority to KR1020150129301A priority Critical patent/KR20170031562A/en
Publication of KR20170031562A publication Critical patent/KR20170031562A/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/008—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for protective arrangements according to this subclass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/145—Indicating the presence of current or voltage
    • G01R19/155—Indicating the presence of voltage
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission

Abstract

The present invention relates to a device and a method for preventing malfunction of a protection relay. The device for preventing malfunction of the protection relay comprises: an image voltage sensing unit which senses the generation of an image voltage from a bus line of a transformer; a control signal generating unit which generates a control signal for blocking the input line of an automatic transfer switch when the generation of the image voltage is sensed; and a notification generation unit which generates notification when the generation of the image voltage is sensed.

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus and a method for preventing malfunction of a protective relay,

The present invention relates to an apparatus and method for preventing a malfunction of a protective relay, and more particularly, to a malfunction preventing apparatus and method for preventing a malfunction of a protective relay, which prevents a protection relay from operating in accordance with a video voltage generated by a circuit miswiring of a potential transformer The present invention relates to an apparatus and a method for preventing the same.

Stable and continuous quality power supply in the power system is a very important issue in modern society, and the importance of protecting the power system is increasing day by day. The ability to detect the fault quickly and accurately is the key to protection of the power system can do. Accordingly, a protective relay is used to detect and protect the various power devices and facilities constituting the power system in the event of a failure or an accident.

The protective relay detects various electric quantities of the switchboard and compares them with the value of the normal operation. If a short circuit or a ground fault occurs, and the various electric quantities are out of the preset reference value, the protection relay can quickly detect the electric quantity, And a control function for operating the various breakers and switches in order to separate them from each other.

In recent years, the configuration and characteristics of the protection equipment have been complicated and diversified, and the protection requirements have become stricter. In addition, digital protection relays have been put into practical use due to the development of digital technology.

As the power system configuration becomes complicated, digital protection relays also require a variety of functions. Accordingly, the configuration modules of the digital protection relays are further diversified and composed of complex internal devices. As a result, an unexpected error phenomenon frequently occurs in various disturbances in the power system field, resulting in malfunction.

In this connection, Korean Patent Laid-Open Publication No. 2011-0061771 discloses a " self-diagnosis method for preventing malfunction of a protective relay ".

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is an object of the present invention to provide a transformer circuit for detecting the occurrence of a video voltage in a transformer circuit for a meter, And an object thereof is to provide a device and method for preventing such a problem.

According to an aspect of the present invention, there is provided an apparatus for preventing malfunction of a protective relay, including: an image voltage detection unit for detecting the generation of a video voltage from a bus line of a transformer for a meter; A control signal generator for generating a control signal for blocking an input line of the automatic switch when a video voltage is generated; And an alarm sound generating unit for generating an alarm sound when the image voltage is generated.

The image voltage sensing unit may include a first sensing unit connected to a first bus line of the transformer for sensing the generation of a video voltage on a first bus line, And a second sensing unit connected to a second bus line of the transformer for sensing the generation of a video voltage at the second bus line.

The control signal generator may generate a control signal for opening a contact of an input line of the automatic transfer switch so that the image voltage is not inputted to the protective relay through the automatic transfer switch.

The control signal generator may generate a first control signal for opening a contact of an input line of an automatic switch connected to a first bus line when a video voltage is generated from a first bus line of the transformer for a meter, part; And a second generating unit for generating a second control signal for opening the contact of the input line of the automatic transfer switch connected to the second bus line when the image voltage is generated from the second bus line of the instrument transformer .

According to another aspect of the present invention, there is provided a method of preventing a malfunction of a protective relay, comprising: sensing an image voltage from a bus line of a transformer by an image voltage sensing unit; Generating a control signal for blocking an input line of the automatic switch when a video voltage is detected by the control signal generator; And generating an alarm sound when the image voltage is detected by the alarm sound generator.

The step of generating a control signal for shutting off the input line of the automatic switch when the generation of the video voltage is detected includes generating a control signal for opening the contact of the input line of the automatic switch, So that the image voltage is not input.

An apparatus and method for preventing a malfunction of a protective relay according to the present invention having the above-described structure, when an image voltage is generated due to circuit misconnection of a transformer for a meter, an alarm and a control signal are generated, , It is possible to prevent the video voltage from being transmitted to the protection relay, thereby preventing the protection relay due to the video voltage from malfunctioning.

Further, according to the present invention, an alarm is generated when a video voltage is generated, so that it is possible to quickly take measures against misconnection.

1 is a view for explaining a configuration of a system to which a malfunction prevention device of a protection relay according to the present invention is applied.
2 is a view for explaining a configuration of a malfunction prevention device of a protection relay according to the present invention.
3 is a circuit diagram of a malfunction prevention apparatus for a protection relay according to the present invention.
4 is a flowchart for explaining a procedure of a malfunction prevention method of a protection relay according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to facilitate a person skilled in the art to easily carry out the technical idea of the present invention. . First, in adding reference numerals to the constituent elements of the drawings, it should be noted that the same constituent elements are denoted by the same reference numerals whenever possible even if they are displayed on other drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a view for explaining a configuration of a system to which a malfunction prevention device of a protection relay according to the present invention is applied.

1, a system according to the present invention includes a potentiometer 10, a malfunction prevention device 100 of a protection relay according to the present invention, an automatic switch 20, and a protection relay 30 ).

The meter transformer 10 converts the high voltage of the power system to a low voltage suitable for power measurement by the meter.

The apparatus 100 for preventing malfunction of the protective relay is connected to the secondary bus of M.Tr of the transformer for the meter to detect the generation of the image voltage and generate a control signal for preventing malfunction of the protection relay.

Here, the image voltage appears mainly when a ground fault occurs in one line, and the magnitude of the image voltage may range from 0 to 190 V according to the ground fault resistance of the ground fault point. Also, the video voltage may appear when a miswiring or a disconnection occurs in a normal operation state of the power system (in the absence of a ground fault). In the present invention, the generation of a video voltage according to miswiring is detected.

The automatic switch 20 opens the contact point by the control signal generated from the malfunction prevention device 100 of the protection relay so that the video voltage is not transmitted to the protection relay 30. [

The protection relay (30) protects the power system by disconnecting the trunk from the bus line by driving the circuit breaker when an error occurs in the power system. At this time, the protection relay according to the present invention can prevent the breaker from being driven by the image voltage generated due to mis-wiring instead of the actual breakdown.

2 is a view for explaining a configuration of a malfunction prevention device of a protection relay according to the present invention.

Referring to FIG. 2, an apparatus 100 for preventing malfunction of a protection relay according to the present invention includes an image voltage detecting unit 110, a control signal generating unit 120, and an alarm generating unit 130.

The image voltage sensing unit 110 senses the generation of the image voltage on the secondary side of the M.tr. To this end, the image voltage sensing unit 110 includes a first sensing unit 111 connected to the first bus line of the M secondary secondary side of the instrument transformer to sense the generation of the image voltage on the first bus line, And a second sensing unit 112 connected to a second bus line of the secondary side to sense generation of a video voltage on the second bus line.

The control signal generating unit 120 generates a control signal for opening the contact to cut off the input line of the automatic switch when the generation of the video voltage is detected.

For this, the control signal generator 120 generates a first control signal for opening the contact of the input line of the automatic transfer switch connected to the first bus line when the video voltage is detected from the first sensing unit 111 When a video voltage is generated from the first generating unit 121 and the second sensing unit 112, a second control signal for generating a second control signal for opening the contact of the input line of the automatic transfer switch connected to the second bus line (Not shown).

That is, the first generating unit 121 and the second generating unit 122 generate the first control signal and the second control signal, respectively, and generate the first control signal and the second control signal, So that the image voltage is not inputted to the protection relay through the automatic transfer switch.

The alarm generating unit 130 generates an alarm sound when any one of the first sensing unit 111 and the second sensing unit 112 senses the generation of a video voltage so that a follow-up action is performed.

3 is a circuit diagram of a malfunction prevention apparatus for a protection relay according to the present invention.

3, the circuit diagram of the malfunction prevention apparatus 100 of the protective relay according to the present invention is shown in FIG. 3, in which the a contact point a of the first bus line is connected to the first bus line (# 1 line) The b contacts of the second bus (# 2 bus) are connected in series to sense the generation of the video voltage on the first bus and generate a control signal. The a contact of the second bus line and the contact b of the first bus line are connected in series to the second bus line of the M secondary of the instrumental transformer to sense the generation of the image voltage on the second bus line and generate a control signal .

4 is a flowchart for explaining a procedure of a malfunction prevention method of a protection relay according to the present invention.

Referring to FIG. 4, the malfunction prevention method of the protection relay according to the present invention uses the above-described malfunction prevention device of the protection relay, and a description thereof will be omitted.

First, the generation of the image voltage at the M.tr secondary side of the instrument transformer is sensed (S100).

The step S100 detects the generation of the image voltage from the first bus line and the second bus line of the M.tr secondary side of the instrument transformer.

Next, when the generation of the video voltage is detected, a control signal for opening the contact to cut off the input line of the automatic transfer switch is generated (S200).

In operation S200, when a video voltage is detected, a control signal is generated to open the contact of the input line of the automatic switch so that the video voltage is not inputted to the automatic switch.

Next, when the generation of the video voltage is detected, an alarm sound is generated (S300).

As described above, the apparatus and method for preventing malfunction of the protection relay according to the present invention generate alarms and control signals when the image voltage is generated by circuit misconnection of the transformer for meters, thereby interrupting the transfer of the automatic transfer switch, It is possible to prevent the protection relay due to the video voltage from malfunctioning.

Further, according to the present invention, by generating an alarm when a video voltage is generated, it is possible to quickly take measures against miswiring.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but many variations and modifications may be made without departing from the scope of the present invention. It will be understood that the invention may be practiced.

100: Protection relay malfunction prevention device
110: Image voltage sensing unit
120: Control signal generator
130: Alarm sound generator

Claims (6)

A video voltage sensing unit for sensing the generation of a video voltage from a bus line of the transformer for a meter;
A control signal generator for generating a control signal for blocking an input line of the automatic switch when a video voltage is generated; And
An alarm sound generator for generating an alarm sound when a video voltage is generated;
And a protection relay for preventing malfunction of the protection relay. The method according to claim 1,
The image voltage sensing unit includes:
A first sensing unit connected to a first bus line of the transformer for sensing the generation of a video voltage on the first bus line; And
A second sensing unit connected to a second bus line of the transformer for sensing the generation of a video voltage on the second bus line;
And a protection relay for preventing malfunction of the protection relay. The method according to claim 1,
Wherein the control signal generator generates a control signal to open a contact point of an input line of the automatic switch, so that a video voltage is not inputted to the protective relay via the automatic switch. The method according to claim 1,
Wherein the control signal generator comprises:
A first generating unit for generating a first control signal for opening a contact of an input line of an automatic transfer switch connected to a first bus line when a video voltage is generated from a first bus line of the transformer for a meter; And
A second generating unit for generating a second control signal for opening a contact of an input line of an automatic transfer switch connected to a second bus line when a video voltage is generated from a second bus line of the instrument transformer;
And a protection relay for preventing malfunction of the protection relay. Sensing an image voltage generation from a bus line of the transformer for the instrument by the image voltage sensing unit;
Generating a control signal for blocking an input line of the automatic switch when a video voltage is detected by the control signal generator; And
Generating an alarm sound when the image voltage is detected by the alarm sound generator;
And a protection relay for preventing malfunction of the protection relay. 6. The method of claim 5,
Generating a control signal for shutting off the input line of the automatic switch when the generation of the video voltage is detected,
And a control circuit for opening a contact of an input line of the automatic switch is generated so that an image voltage is not inputted to the protection relay through the automatic switch.


KR1020150129301A 2015-09-11 2015-09-11 Apparatus and method for preventing malfunction of digital protection relay KR20170031562A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107768123A (en) * 2017-10-23 2018-03-06 湖北霞光电力设备有限公司 A kind of intelligent power-off protection electromagnetic potential transformer
KR102047606B1 (en) 2018-07-12 2019-11-21 한국전력공사 Removable contact switch of protection and distribution board terminal block
KR20210040665A (en) * 2019-10-04 2021-04-14 한국수력원자력 주식회사 Apparatus and method for auto transfer of motor bus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107768123A (en) * 2017-10-23 2018-03-06 湖北霞光电力设备有限公司 A kind of intelligent power-off protection electromagnetic potential transformer
KR102047606B1 (en) 2018-07-12 2019-11-21 한국전력공사 Removable contact switch of protection and distribution board terminal block
KR20210040665A (en) * 2019-10-04 2021-04-14 한국수력원자력 주식회사 Apparatus and method for auto transfer of motor bus

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