KR102289503B1 - The supervisory unit for second side of the current transformer containing incompleteness contact - Google Patents

The supervisory unit for second side of the current transformer containing incompleteness contact Download PDF

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KR102289503B1
KR102289503B1 KR1020200112698A KR20200112698A KR102289503B1 KR 102289503 B1 KR102289503 B1 KR 102289503B1 KR 1020200112698 A KR1020200112698 A KR 1020200112698A KR 20200112698 A KR20200112698 A KR 20200112698A KR 102289503 B1 KR102289503 B1 KR 102289503B1
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current transformer
secondary side
current
unit
short
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Korean (ko)
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양승권
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주식회사 주왕산업
주식회사 대한전공
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/62—Testing of transformers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R13/00—Arrangements for displaying electric variables or waveforms
    • G01R13/02—Arrangements for displaying electric variables or waveforms for displaying measured electric variables in digital form
    • G01R13/0281—Arrangements for displaying electric variables or waveforms for displaying measured electric variables in digital form using electro-optic elements
    • 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
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/55—Testing for incorrect line connections
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G08B21/185—Electrical failure alarms
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/14—Central alarm receiver or annunciator arrangements
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
    • G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
    • G08B5/36—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/10—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to mechanical injury, e.g. rupture of line, breakage of earth connection
    • 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
    • H02H7/04—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 transformers
    • H02H7/042—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 transformers for current transformers

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Electromagnetism (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The present invention relates to a current transformer secondary side open monitoring device. When a current transformer secondary circuit is open or incompletely connected in real time and when the current transformer secondary circuit is open or incompletely connected, the current transformer secondary side open monitoring device is configured to immediately short-circuit a current transformer secondary side terminal and immediately transmit the fact to a central control center.

Description

불완전 접속시 단락기능을 포함한 변류기 2차측 개방 감시장치{The supervisory unit for second side of the current transformer containing incompleteness contact}The supervisory unit for second side of the current transformer containing incompleteness contact}

본 발명은 변류기 2차측 개방 감시장치에 관한 것으로, 변류기(current transformer) 2차측 회로의 개방 또는 불완전 접속 여부를 실시간으로 판단하고 변류기 2차측 회로가 개방 또는 불완전 접속되었을 경우, 즉시 변류기 2차측 단자를 단락시키고 그 사실을 즉시 중앙관제센터로 전송하도록 구성된 변류기 2차측 개방감시장치에 관한 것이다.The present invention relates to a current transformer secondary side open monitoring device, which determines in real time whether the secondary side circuit of a current transformer is open or incompletely connected, and immediately checks the secondary side terminal of the current transformer when the secondary side circuit of the current transformer is open or incompletely connected. It relates to a current transformer secondary side open monitoring device configured to short circuit and immediately transmit the fact to the central control center.

변류기란 전력 계통에 흐르는 전류를 측정하여 계전기 또는 계측기 등에 입력하기 위한 장치이며, 전력선로에 흐르는 1차 전류에 의하여 발생하는 자속(magnetic flux)을 집속시키기 위한 코어와 코어에 유기된 자속에 의하여 2차 전류를 발생시키기 위하여 상기 코어를 감싸는 2차 코일로 이루어지는 장치이다.A current transformer is a device for measuring the current flowing in the power system and inputting it to a relay or measuring instrument. A device comprising a secondary coil surrounding the core to generate a secondary current.

일반적으로, 변류기(Current Transformer, CT)는 큰 교류 전류에서 그것에 비례하는 작은 전류를 얻는장치로서, 상기 변류기의 주요부는 변압기와 같은 성층 코어에 권선수가 적은 1차 코일과 권선수가 많은 2차 코일을 감은 것으로, 상기 2차 코일에는 전류계나, 전력계, 계전기 등이 설치된다.In general, a current transformer (CT) is a device for obtaining a small current proportional to a large alternating current, and the main part of the current transformer is a stratified core such as a transformer, a primary coil with a small number of turns and a secondary coil with a large number of turns. It is wound, and an ammeter, a power meter, a relay, etc. are installed in the secondary coil.

1차 코일의 역할을 하는 선로에 흐르는 전류에 의하여 2차 코일에 그에 비례하는 전류가 유기되고 변류비에 의하여 2차 전류의 크기가 결정된다. A current proportional thereto is induced in the secondary coil by the current flowing in the line serving as the primary coil, and the magnitude of the secondary current is determined by the current ratio.

여기서, 선로와 2차 코일간의 쇄교 자속을 최대로 하기 위하여 대부분의 경우에는 코어가 철인 철심 변류기를 사용하고 있다.Here, in order to maximize the flux linkage between the line and the secondary coil, an iron-core current transformer having an iron core is used in most cases.

상기 변류기의 1차 및 2차측의 전류비는 각기 코일 권선수의 반비(反比)와 비슷하다. 1차측 전류의 정격값은 수십 A에서 수천 A까지 여러 가지가 있으나, 2차 측 전류의 정격값은 대부분이 5A이다.The current ratio of the primary and secondary sides of the current transformer is similar to the inverse ratio of the number of coil turns, respectively. The rated value of the primary current varies from several tens of A to several thousand A, but the rated value of the secondary current is mostly 5A.

이상이 없는 정상적인 상태에서는 변류기는 1차측 전류에 의하여 유기된 2차 측 전류에 의하여 계전기 등에 1차측 전류에 관한 데이터를 입력하게 되나, 시스템의 낙후나, 전력계, 계전기 또는 계측기 등의 내부 회로가 개방되거나, 기타 사고로 인해 변류기 2차측의 회로가 끊어진 경우가 문제가 되는데, 이러한 경우에 변류기 2차측이 '개방'되었다고 한다.In a normal state without any abnormality, the current transformer inputs primary-side current data to the relay by the secondary-side current induced by the primary-side current. Or the case where the circuit on the secondary side of the current transformer is cut due to other accidents is a problem. In this case, the secondary side of the current transformer is said to be 'open'.

상기 변류기의 2차측 단자를 개방시키는 것은 매우 위험하다. 왜냐하면, 변류기의 1차측 코일에 전류가 흐르는 상태에서 2차측 코일이 개방되면, 1차측 전류가 모든 철심을 자화시켜 철심이 포화됨에 따라 상기 변류기 2차측 단자전압이 급격히 상승하여 발열될 수 있고, 이로 인해 철심에 감긴 코일이 손상되거나 폭발할 위험성도 있기 때문이다.It is very dangerous to open the secondary terminal of the current transformer. This is because, when the secondary side coil is opened while the current flows in the primary side coil of the current transformer, the primary side current magnetizes all the iron cores, and as the iron cores are saturated, the voltage at the secondary side terminal of the current transformer rises sharply and heat can be generated. This is because there is a risk that the coil wound on the iron core may be damaged or explode.

따라서, 상기 변류기의 2차측 코일에 연결된 전류계나, 전력계, 계전기 또는 계측기 등의 내부 회로가 개방되거나 기타 사유로 인해 변류기의 2차 코일이 개방(Open)되었을 때 이를 즉시 감지하여 개방 사실을 중앙 관제소로 전송하거나 개방된 2차측 단자를 즉시 단락시킬 수 있는 장치가 필요한 실정이다.Therefore, when an internal circuit such as an ammeter, wattmeter, relay, or measuring instrument connected to the secondary coil of the current transformer is opened or the secondary coil of the current transformer is opened due to other reasons, it is immediately detected and the fact of the opening is notified to the central control office. There is a need for a device capable of immediately shorting the secondary terminal that is open or transmitted to the .

또한, 전선과 전선, 전선과 개폐장치, 전선과 접속단자 등의 접속개소의 도체에서 전기적인 접촉상태가 불완전하면 도체의 접속 또는 접촉부에 요철현상이 생기고 그 부분에서의 집중저항으로 인해 저항값이 증가하게 된다.In addition, if the electrical contact state is incomplete in the conductor at the connection point such as the wire and the wire, the wire and the switchgear, and the wire and the connection terminal, unevenness occurs in the connection or contact of the conductor, and the resistance value decreases due to the concentrated resistance in that part. will increase

도 1은 변류기 2차측의 회로에서 불완전 접속시에 전류가 감소하는 이유를 도시한 개념 설명도이다.1 is a conceptual explanatory diagram showing the reason why the current decreases in the case of incomplete connection in the circuit on the secondary side of the current transformer.

도시된 바를 보면, 변류기의 2차측 코일에 연결된 전류계나, 전력계, 계전기 또는 계측기 등의 접속이 불완전한 경우, 다시말해, 변류기 2차측이 불완전 접속될 경우 변류기 2차측 임피던스가 증가하여 변류기의 정격용량의 초과 부담이 발생되고 이에 따라 측정오차가 발생하며 이로 인해 2차측의 계측기의 오차발생 또는 계전기 오동작의 원인이 된다.As shown, if the connection of the ammeter, wattmeter, relay or measuring instrument connected to the secondary coil of the current transformer is incomplete, that is, if the secondary side of the current transformer is incompletely connected, the impedance of the secondary side of the current transformer increases and the rated capacity of the current transformer is increased. Excess load is generated and measurement error occurs accordingly, which causes errors in the secondary side measuring instrument or relay malfunction.

따라서 변류기의 2차측이 불완전 접속상태에 있는지를 즉시 감지하여 불완전접속 사실을 중앙 관제소로 전송하거나 불완전접속된 2차측 단자를 즉시 단락시킬 수 있는 장치가 필요한 실정이다.Therefore, there is a need for a device capable of immediately detecting whether the secondary side of the current transformer is in an incompletely connected state and transmitting the incomplete connection to the central control center or immediately shorting the incompletely connected secondary terminal.

이러한 점을 착안하여 한국등록특허 제10-1772196호(발명의 명칭: 변류기 2차측 개방 감시 수배전반)은 변류기의 2차측 단자가 개방(open)되었을 때 개방 사실을 중앙 관제소로 전송함과 동시에 변류기의 2차측 단자를 단락(short)시켜 변류기의 폭발 사고나 감전사고를 미연에 방지할 수 있도록 구성된 변류기 2차측 개방 감시 수배전반이 제안되었다.Taking this into consideration, Korean Patent Registration No. 10-1772196 (Title of the Invention: Current transformer secondary side open monitoring switchboard) transmits the fact of opening to the central control station when the secondary side terminal of the current transformer is open and at the same time transmits the current transformer A current transformer secondary side open monitoring switchboard has been proposed to prevent an explosion accident or electric shock accident of the current transformer in advance by shorting the secondary terminal.

도 2는 공지된 변류기 2차측 개방 감시장치를 도시한 것이다. 도시된 공지된 변류기 2차측 개방 감시장치의 구성을 보면, 변류기 2차측 개방여부를 판단하기 위하여, 변류기 2차측에 과전압, 또는 과도전압이 발생되고 있음을 기준전압과 비교하면서 이를 통해 변류기 2차측 개방여부를 판단하는 구성이다.2 shows a known current transformer secondary-side open monitoring device. Looking at the configuration of the known open current transformer secondary side open monitoring device shown, in order to determine whether the current transformer secondary side is open or not, it is compared with a reference voltage that an overvoltage or overvoltage is occurring on the secondary side of the current transformer. It is a composition that determines whether or not

그러나, 이러한 종래의 방식으로는 과전압을 기준전압과 비교 판단하는데 있어 시간적인 지연이 발생할 요인이 있다.However, in this conventional method, there is a factor that a time delay occurs in comparing and determining the overvoltage with the reference voltage.

다시말해, 변류기 2차측에 과전압이 발생하는 경우의 거의 대부분의 원인은 변류기 2차측이 개방되는 경우이기에, 과전압이 발생되는 것이 확인되면 보다 신속하게 변류기의 2차측 단자를 단락(short)시켜 변류기의 폭발 사고나 감전사고를 미연에 방지할 필요성이 대두된다.In other words, most of the causes of the occurrence of overvoltage on the secondary side of the current transformer are when the secondary side of the current transformer is opened. The need to prevent explosion accidents or electric shock accidents in advance is emerging.

특허문헌 1: 한국등록특허 제10-1772196호(공고일: 2017년09월05일)Patent Document 1: Korean Patent Registration No. 10-1772196 (Announcement Date: September 05, 2017) 특허문헌 2: 한국등록특허 제10-2116030호(공고일: 2020년05월28일)Patent Document 2: Korea Registered Patent No. 10-2116030 (Announcement date: May 28, 2020)

상기의 문제점을 해결하기 위하여, 본 발명은 변류기 2차측 회로가 개방 또는 불완전 접속되었을 경우 신속히 변류기(CT) 2차측 단자를 단락시키고 동작정보를 중앙관제소에 알려 적절한 조치를 취하게 함으로써 변류기 폭발, 화재, 계측오차 발생, 계전기 오동작 등을 예방할 수 있도록 변류기 2차측 개방 감시장치를 제공하는데 본 발명의 목적이 있다.In order to solve the above problems, the present invention provides a short circuit to the secondary terminal of the current transformer (CT) when the secondary circuit of the current transformer is open or incompletely connected, and informs the central control office of the operation information to take appropriate measures. , It is an object of the present invention to provide a current transformer secondary side open monitoring device to prevent the occurrence of measurement errors, relay malfunction, and the like.

상기의 목적을 달성하기 위하여, 본 발명은 변류기 2차측 개방 감시장치에 있어서, 변류기 2차측이 개방되어 있는지 판단하여, 변류기 2차측 단자가 단락되도록 동작하는 제어부; 변류기 2차측 단자 사이에 변류기 2차측이 개방되었을 경우 변류기 2차측을 단락시키기 위하여 구성된 변류기 2차측 단락부; 및 변류기 2차측 단자와 접지 사이에 위치하여, 변류기 2차측의 회로가 개방되었을 경우, 상승하는 전압으로부터 제어부를 보호하도록 상기 접지로 전류를 방류하도록 구성된 바리스터;를 포함하며,In order to achieve the above object, the present invention provides a current transformer secondary side open monitoring device, comprising: a controller operable to determine whether the current transformer secondary side is open and to short-circuit the current transformer secondary side terminal; a current transformer secondary side short circuit unit configured to short-circuit the current transformer secondary side when the current transformer secondary side is opened between the secondary side terminals of the current transformer; and a varistor located between the secondary terminal of the current transformer and the ground, configured to discharge current to the ground to protect the control unit from the rising voltage when the circuit of the secondary side of the current transformer is opened.

상기 제어부는 상기 바리스터가 동작하는 경우에 상기 변류기 2차측 단락부를 동작시켜 상기 변류기 2차측 단자를 단락시키도록 구성된 것을 특징으로 하는 변류기 2차측 개방 감시장치를 제시한다.When the varistor operates, the controller operates the current transformer secondary side short circuit to short-circuit the current transformer secondary side terminal.

상기 제어부에는, 상기 바리스터가 동작되면 감지신호와 트리거 신호를 발생시키는 바리스터 동작 감시부; 상기 바리스터 동작감시부에서 발생된 트리거신호를 수신하면 on 상태로 전환하는 스위칭부; 및 상기 스위칭부가 on 상태가 되면서 상기 바리스터 동작감시부에서 발생된 감지신호를 수신하면, 상기 변류기 2차측 단락부를 제어하여 상기 변류기 2차측 단자를 단락시키도록 구성된 동작 명령부;를 포함하여 구성된다.The control unit includes: a varistor operation monitoring unit for generating a detection signal and a trigger signal when the varistor is operated; a switching unit for switching to an on state when receiving a trigger signal generated by the varistor operation monitoring unit; and an operation command unit configured to short-circuit the secondary-side terminal of the current transformer by controlling the secondary-side short-circuiting unit of the current transformer when the switching unit is turned on and receiving the sensing signal generated by the varistor operation monitoring unit.

또한, 본 발명은 변류기 2차측 회로가 불완전 접속되었을 경우를 대비하여 다음과 같은 구성을 제시한다.In addition, the present invention proposes the following configuration in preparation for the case where the current transformer secondary side circuit is incompletely connected.

본 발명은 상기 변류기 2차측 단자로부터 전류를 공급받아 디지털 변환하는 AD 변환부; 상기 AD 변환부로부터 디지털 변환된 전류를 수신하여 설정전류와 비교하여 설정전류 이하인 경우 감지신호를 발생하는 전류 판단부; 및 상기 전류 판단부에 판단 기준전류를 설정하는 전류 설정부;가 더 구성되며, 상기 동작 명령부는 상기 전류 판단부에서 발생된 감지신호를 수신하면, 상기 변류기 2차측 단락부를 제어하여 상기 변류기 2차측 단자를 단락시키도록 구성된다.The present invention provides an AD converter for digital conversion by receiving a current from the secondary terminal of the current transformer; a current determination unit that receives the digitally converted current from the AD conversion unit and generates a detection signal when the current is lower than the set current compared to the set current; and a current setting unit for setting the determination reference current to the current determination unit, wherein the operation command unit controls the current transformer secondary side short circuit unit when receiving the sensing signal generated by the current determination unit to control the current transformer secondary side It is configured to short the terminal.

상기 동작 명령부는 상기 변류기 2차측 단락부를 제어하여 상기 변류기 2차측 단자를 단락시키면, 표시램프가 점등되고, 유무선 통신모듈을 통해 중앙 관제소로 동작정보가 전송되도록 동작신호를 발생하도록 구성된다.The operation command unit is configured to generate an operation signal so that when the secondary terminal of the current transformer is short-circuited by controlling the secondary-side short circuit unit, the display lamp is turned on and operation information is transmitted to the central control center through the wired/wireless communication module.

본 발명에 따른 변류기 2차측 개방 감시장치는 변류기 2차측이 개방 또는 불완전 접속 되었는지 여부를 실시간 감시하고 변류기 2차측이 개방 또는 불완전 접속되었을 경우 즉시 변류기 2차측 단자를 단락시키고 동작상태를 중앙관제소로 전송함으로써 신속한 조치가 이루어질수 있도록 한다.The current transformer secondary side open monitoring device according to the present invention monitors whether the current transformer secondary side is open or incompletely connected in real time, and when the current transformer secondary side is open or incompletely connected, the current transformer secondary side terminal is short-circuited immediately and the operation status is transmitted to the central control center This enables prompt action to be taken.

결국, 본 발명에 따른 변류기 2차측 개방 감시장치는 변류기 2차측 회로의 개방 또는 불완전 접속에 따른 변류기 폭발, 화재발생, 계측오차발생, 계전기 오동작 등의 사고를 예방하는 효과가 있다.As a result, the current transformer secondary side open monitoring device according to the present invention has an effect of preventing accidents such as current transformer explosion, fire, measurement error, and relay malfunction due to open or incomplete connection of the secondary side circuit of the current transformer.

도 1은 변류기 2차측의 회로에서 불완전 접속시에 전류가 감소하는 이유를 도시한 개념 설명도이다.
도 2는 공지된 변류기 2차측 개방 감시장치를 도시한 것이다.
도 3은 본 발명에 의한 변류기 2차측 개방 감시장치의 구성도이다.
도 4는 본 발명에 의한 변류기 2차측 개방 감시장치의 동작상태도이다.1 is a conceptual explanatory diagram showing the reason why the current decreases in the case of incomplete connection in the circuit on the secondary side of the current transformer.
2 shows a known current transformer secondary-side open monitoring device.
3 is a block diagram of a current transformer secondary side open monitoring device according to the present invention.
4 is an operation state diagram of a current transformer secondary-side open monitoring device according to the present invention.

이하 본 발명인 불완전 접속시 단락기능을 포함한 변류기 2차측 개방 감시장치에 대해 첨부된 도면을 참조하여 자세하게 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings for the current transformer secondary side open monitoring device including a short circuit function in case of incomplete connection.

본 발명은 변류기 2차측 회로가 개방 또는 불완전 접속되었을 경우 신속히 변류기(CT) 2차측 단자를 단락시키고 동작정보를 중앙관제소에 알려 적절한 조치를 취하게 함으로써 변류기 폭발, 화재, 계측오차 발생, 계전기 오동작 등을 예방할 수 있도록 변류기 2차측 개방 감시장치를 제공하는 구성이다.According to the present invention, when the secondary side circuit of the current transformer is open or incompletely connected, the current transformer (CT) secondary terminal is short-circuited and the operation information is notified to the central control center so that appropriate measures are taken. It is a configuration that provides a current transformer secondary side open monitoring device to prevent

도 3은 본 발명에 의한 변류기 2차측 개방 감시장치의 구성도이다.3 is a block diagram of a current transformer secondary side open monitoring device according to the present invention.

도시된 바를 참조하면, 변류기 2차측에는 변류기(CT) 2차측이 개방되어 있는지 판단하여, 변류기 2차측 단자가 단락되도록 동작하는 제어부(10)가 구성된다.Referring to the figure, the control unit 10 is configured to determine whether the secondary side of the current transformer (CT) is open on the secondary side of the current transformer, and operate so that the terminal of the secondary side of the current transformer is short-circuited.

또한, 변류기 2차측 단자 사이에 변류기 2차측이 개방되었을 경우 변류기 2차측을 단락시키기 위하여 변류기 2차측 단락부(100)가 구성된다.In addition, when the secondary side of the current transformer is opened between the terminals of the secondary side of the current transformer, the current transformer secondary side short circuit part 100 is configured to short-circuit the secondary side of the current transformer.

또한, 변류기 2차측 단자와 접지 사이에 위치하여, 변류기 2차측의 회로가 개방되었을 경우, 상승하는 전압으로부터 제어부(10)를 보호하도록 상기 접지로 전류를 방류하도록 구성된 바리스터(200)가 구성된다.In addition, located between the secondary terminal of the current transformer and the ground, when the circuit of the secondary side of the current transformer is opened, the varistor 200 configured to discharge current to the ground to protect the control unit 10 from the rising voltage is configured.

상기 제어부(10)는 변류기 2차측 회로가 개방되어 과도전압이 흐르게 되고 이에, 상기 바리스터(200)가 동작하는 경우에 상기 변류기 2차측 단락부(100)를 동작시켜 상기 변류기 2차측 단자를 단락시키도록 구성된다.The control unit 10 operates the current transformer secondary side short circuit unit 100 to short-circuit the current transformer secondary side terminal by operating the current transformer secondary side short circuit unit 100 when the current transformer secondary side circuit is opened and transient voltage flows. is composed of

상기 바리스터(200)는 두 단자 사이의 전압이 낮은 경우에는 전기 저항이 높지만, 어느 정도 이상으로 전압이 높아지면 급격히 저항이 낮아지는 성질을 가진 소자로서, 과전압이나 과도전압이 인가되면, 전압차가 커지면서 동작하여 제어부(10)를 높은 전압으로부터 보호하게 된다.The varistor 200 has a high electrical resistance when the voltage between the two terminals is low, but has a property of rapidly lowering the resistance when the voltage is increased to a certain extent or more. When an overvoltage or overvoltage is applied, the voltage difference increases In operation, the control unit 10 is protected from high voltage.

상기 제어부(10)의 구성을 보다 구체적으로 보면 다음과 같다.In more detail, the configuration of the control unit 10 is as follows.

상기 제어부(10)에는 상기 바리스터(200)가 동작되면 감지신호와 트리거 신호를 발생시키는 바리스터 동작 감시부(300)가 구성된다.The control unit 10 includes a varistor operation monitoring unit 300 that generates a detection signal and a trigger signal when the varistor 200 is operated.

또한, 제어부(10)에는 상기 바리스터 동작감시부(300)에서 발생된 트리거신호를 수신하면 on 상태로 전환하는 스위칭부(400)가 구성된다.In addition, the control unit 10 includes a switching unit 400 that switches to the on state when receiving the trigger signal generated by the varistor operation monitoring unit 300 .

또한, 제어부(10)에는 동작 명령부(500)가 구성되는데, 동작명령부(500)는 상기 스위칭부(400)가 on 상태가 되는 경우에, 상기 바리스터 동작감시부(300)에서 발생된 감지신호를 수신한다.In addition, the control unit 10 includes an operation command unit 500, the operation command unit 500, when the switching unit 400 is turned on, the detection generated by the varistor operation monitoring unit 300 receive a signal

동작명령부(500)에서 바리스터 동작감시부(300)에서 발생된 감지신호를 수신하면, 상기 변류기 2차측 단락부(100)를 제어하여 상기 변류기 2차측 단자를 단락시키도록 구성된다.When the operation command unit 500 receives the detection signal generated by the varistor operation monitoring unit 300 , the current transformer secondary side short circuit unit 100 is controlled to short-circuit the current transformer secondary side terminal.

또한, 본 발명인 변류기 2차측 개방 감시장치에는 변류기 2차측 회로가 불완전 접속되었을 경우를 대비하여 상기 제어부(10)에는 다음과 같은 구성을 포함한다.In addition, in case the current transformer secondary side circuit is incompletely connected to the current transformer secondary side open monitoring device according to the present invention, the control unit 10 includes the following configuration.

제어부(10)에는 상기 변류기 2차측 단자로부터 전류를 공급받아 디지털 변환하는 AD 변환부(600)가 구성된다. The control unit 10 includes an AD converter 600 that receives the current from the secondary terminal of the current transformer and converts it digitally.

또한, 상기 AD 변환부(600)로부터 디지털 변환된 전류를 수신하여 설정전류와 비교하여 설정전류 이하인 경우 감지신호를 발생하는 전류 판단부(700)가 구성된다.In addition, a current determination unit 700 that receives the digitally converted current from the AD conversion unit 600 and generates a detection signal when the current is less than or equal to the set current compared with the set current is configured.

또한, 상기 전류 판단부(700)에 판단 기준전류를 설정하는 전류 설정부(800)가 더 구성된다.In addition, a current setting unit 800 for setting the determination reference current in the current determination unit 700 is further configured.

상기 동작 명령부(500)는 상기 전류 판단부(700)에서 발생된 감지신호를 수신하면, 변류기 2차측 회로가 개방되었을 경우와 마찬가지로 상기 변류기 2차측 단락부(100)를 제어하여 상기 변류기 2차측 단자를 단락시키도록 구성한다.When the operation command unit 500 receives the detection signal generated by the current determination unit 700, it controls the current transformer secondary side short circuit unit 100 in the same manner as when the current transformer secondary side circuit is open to control the current transformer secondary side. It is configured to short-circuit the terminals.

상기 동작 명령부(500)는 상기 변류기 2차측 단락부(100)를 제어하여 상기 변류기 2차측 단자를 단락시키면, 표시램프가 점등되고, 유무선 통신모듈을 통해 중앙 관제소로 동작정보가 전송되도록 동작신호를 발생하게 된다.When the operation command unit 500 controls the current transformer secondary side short circuit unit 100 to short-circuit the current transformer secondary side terminal, the display lamp is turned on and the operation signal is transmitted to the central control center through the wired/wireless communication module. will occur

상기 표시램프에는 변류기 2차측 회로의 개방상태, 불완전 접속상태 등을 시각, 청각 등의 방법으로 표현하게 되고, 상기 유무선 통신모듈을 통해 전송되는 동작정보에도 변류기 2차측 회로의 개방상태, 불완전 접속상태 등을 시각, 청각 등의 방법으로 표현하도록 구성된다.In the display lamp, the open state and incomplete connection state of the secondary circuit of the current transformer are expressed by visual and auditory methods, and the open state and incomplete connection state of the secondary circuit of the current transformer are also displayed in the operation information transmitted through the wired/wireless communication module. It is configured to express the back in a visual, auditory, or the like way.

또한, 변류기 2차측이 개방되고, 변류기 2차측 개방 감시장치의 동작명령부(500)에 의해 변류기 2차측 단락부(100)가 단락되면서 변류기 2차측 단자가 단락된 이후에 제어부(10)에 구성된 Reset 버튼(미도시)을 누르면, 변류기 2차측 단락부(100)가 다시 오픈(open)되면서 초기상태로 복귀하도록 구성된다.In addition, after the secondary side of the current transformer is opened and the secondary side short-circuiting unit 100 of the current transformer is short-circuited by the operation command unit 500 of the secondary side open monitoring device of the current transformer, the secondary side terminal of the current transformer is short-circuited. When the Reset button (not shown) is pressed, the current transformer secondary side short circuit part 100 is opened again and configured to return to the initial state.

도 4는 본 발명에 의한 변류기 2차측 개방 감시장치의 동작상태도이다.4 is an operation state diagram of a current transformer secondary-side open monitoring device according to the present invention.

도시된 바처럼, 먼저 불완전 접속상태를 판단하기 위한 기준전류를 전류설정부(800)를 통해 설정하게 된다.As shown, first, the reference current for determining the incomplete connection state is set through the current setting unit 800 .

변류기 2차측 회로가 개방이 되면, 과전압 또는 과도전압으로 인해 바리스터(200)가 동작하게 되고, 이를 바리스터 동작감시부(300)에서 감지하게 되면 동작명령부(500)가 동작하면서, 변류기 2차측 단락부(100)를 제어하여 변류기 2차측 회로의 단자가 단락되도록 한다.When the secondary circuit of the current transformer is opened, the varistor 200 is operated due to overvoltage or excessive voltage. By controlling the unit 100, the terminal of the secondary side circuit of the current transformer is short-circuited.

또한, 전류판단부(700)에서 불완전 접속상태를 판단하기 위한 기준전류 이하의 전류가 감지된 경우에는, 마찬가지로 동작명령부(500)가 동작하면서, 변류기 2차측 단락부(100)를 제어하여 변류기 2차측 회로의 단자가 단락되도록 한다.In addition, when a current equal to or less than the reference current for determining the incomplete connection state is sensed by the current determination unit 700 , the operation command unit 500 operates and controls the secondary side short circuit unit 100 of the current transformer. Make sure that the terminals of the secondary circuit are short-circuited.

또한, 동작명령부(500)가 동작하면서 표시램프에는 변류기 2차측 회로의 개방상태, 불완전 접속상태 등을 시각, 청각 등의 방법으로 표현하게 되고, 유무선 통신모듈을 통해 변류기 2차측 회로의 개방상태, 불완전 접속상태 등의 동작정보를 시각, 청각 등의 방법으로 표현하면서 중앙관제센터로 전송하도록 구성된다.In addition, while the operation command unit 500 operates, the display lamp displays the open state and incomplete connection state of the current transformer secondary side circuit by visual and auditory methods, and the open state of the current transformer secondary side circuit through the wired/wireless communication module. It is configured to transmit operation information such as , incomplete connection state, etc. to the central control center while expressing it in a visual or auditory way.

이상을 통해 본 발명의 바람직한 실시예에 대하여 설명하였지만, 본 발명은 이에 한정되는 것이 아니고 특허청구범위와 발명의 상세한 설명 및 첨부한 도면의 범위 안에서 여러 가지로 변형하여 실시하는 것이 가능하고 이 또한 본 발명의 범위에 속하는 것은 당연하다.Although preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and it is possible to carry out various modifications within the scope of the claims, the detailed description of the invention, and the accompanying drawings, and this also It goes without saying that it falls within the scope of the invention.

10: 제어부
100: 변류기 2차측 단락부 200: 바리스터
300: 바리스터 동작 감시부 400: 스위칭부
500: 동작 명령부 600: AD변환부
700: 전류 판단부 800: 전류 설정부10: control
100: current transformer secondary side short circuit 200: varistor
300: varistor operation monitoring unit 400: switching unit
500: operation command unit 600: AD conversion unit
700: current determination unit 800: current setting unit

Claims (4)

변류기 2차측 개방 감시장치에 있어서,
변류기 2차측이 개방되어 있는지 판단하여, 변류기 2차측 단자가 단락되도록 동작하는 제어부;
변류기 2차측 단자 사이에 변류기 2차측이 개방되었을 경우 변류기 2차측을 단락시키기 위하여 구성된 변류기 2차측 단락부; 및
변류기 2차측 단자와 접지 사이에 위치하여, 변류기 2차측의 회로가 개방되었을 경우, 상승하는 전압으로부터 제어부를 보호하도록 상기 접지로 전류를 방류하도록 구성된 바리스터;를 포함하며,
상기 제어부는 상기 바리스터가 동작하는 경우에 상기 변류기 2차측 단락부를 동작시켜 상기 변류기 2차측 단자를 단락시키도록 구성되며,
상기 제어부에는,
상기 바리스터가 동작되면 감지신호와 트리거 신호를 발생시키는 바리스터 동작 감시부;
상기 바리스터 동작감시부에서 발생된 트리거신호를 수신하면 on 상태로 전환하는 스위칭부; 및
상기 스위칭부가 on 상태가 되면서 상기 바리스터 동작감시부에서 발생된 감지신호를 수신하면, 상기 변류기 2차측 단락부를 제어하여 상기 변류기 2차측 단자를 단락시키도록 구성된 동작 명령부;를 포함하여 구성된 것을 특징으로 하는 불완전 접속시 단락기능을 포함한 변류기 2차측 개방 감시장치.In the current transformer secondary side open monitoring device,
a control unit that determines whether the secondary side of the current transformer is open, and operates to short-circuit the secondary terminal of the current transformer;
a current transformer secondary side short circuit unit configured to short-circuit the current transformer secondary side when the current transformer secondary side is opened between the secondary side terminals of the current transformer; and
a varistor positioned between the secondary terminal of the current transformer and the ground, and configured to discharge current to the ground to protect the control unit from the rising voltage when the circuit of the secondary side of the current transformer is opened; and
The control unit is configured to operate the current transformer secondary side short-circuiting unit to short-circuit the current transformer secondary side terminal when the varistor operates,
In the control unit,
a varistor operation monitoring unit that generates a detection signal and a trigger signal when the varistor is operated;
a switching unit for switching to an on state when receiving a trigger signal generated by the varistor operation monitoring unit; and
and an operation command unit configured to short-circuit the secondary-side terminal of the current transformer by controlling the secondary-side short-circuiting unit of the current transformer when the switching unit is turned on and receiving the detection signal generated by the varistor operation monitoring unit. Current transformer secondary side open monitoring device including short circuit function in case of incomplete connection. 제 1항에 있어서,
상기 변류기 2차측 단자로부터 전류를 공급받아 디지털 변환하는 AD 변환부;
상기 AD 변환부로부터 디지털 변환된 전류를 수신하여 설정전류와 비교하여 설정전류 이하인 경우 감지신호를 발생하는 전류 판단부; 및
상기 전류 판단부에 판단 기준전류를 설정하는 전류 설정부;가 더 구성되며,
상기 동작 명령부는 상기 전류 판단부에서 발생된 감지신호를 수신하면, 상기 변류기 2차측 단락부를 제어하여 상기 변류기 2차측 단자를 단락시키도록 구성된 것을 특징으로 하는 불완전 접속시 단락기능을 포함한 변류기 2차측 개방 감시장치.The method of claim 1,
an AD converter for digital conversion by receiving current from the secondary terminal of the current transformer;
a current determination unit that receives the digitally converted current from the AD conversion unit and generates a detection signal when the current is lower than the set current compared to the set current; and
A current setting unit for setting the determination reference current to the current determination unit; is further configured,
The operation command unit is configured to short-circuit the secondary side terminal of the current transformer by controlling the secondary side short circuit unit of the current transformer when receiving the detection signal generated by the current determination unit. monitoring device. 제 2항에 있어서,
상기 동작 명령부는 상기 변류기 2차측 단락부를 제어하여 상기 변류기 2차측 단자를 단락시키면, 표시램프가 점등되고, 유무선 통신모듈을 통해 중앙 관제소로 동작정보가 전송되도록 동작신호를 발생하는 것을 특징으로 하는 불완전 접속시 단락기능을 포함한 변류기 2차측 개방 감시장치.3. The method of claim 2,
The operation command unit controls the current transformer secondary side short-circuiting unit to short-circuit the current transformer secondary side terminal, the display lamp is turned on, and the operation signal is generated so that the operation information is transmitted to the central control station through the wired/wireless communication module. Current transformer secondary side open monitoring device including short circuit function when connected. 삭제delete
KR1020200112698A 2020-09-03 2020-09-03 The supervisory unit for second side of the current transformer containing incompleteness contact KR102289503B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200352036Y1 (en) * 2004-03-09 2004-06-04 삼성계측제어(주) A circuit for sensing open state of the secondary terminal of a current transformer
KR101772196B1 (en) 2017-07-26 2017-09-05 주식회사 서호산전 The switchboard for sensing open state in secondary-side coil of current transformer
KR102116030B1 (en) 2020-01-10 2020-05-28 (주)세명이앤씨 Switchboard with secondary open monitoring of current transformer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200352036Y1 (en) * 2004-03-09 2004-06-04 삼성계측제어(주) A circuit for sensing open state of the secondary terminal of a current transformer
KR101772196B1 (en) 2017-07-26 2017-09-05 주식회사 서호산전 The switchboard for sensing open state in secondary-side coil of current transformer
KR102116030B1 (en) 2020-01-10 2020-05-28 (주)세명이앤씨 Switchboard with secondary open monitoring of current transformer

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