KR20140013719A - Over current relay and circuit breaker having the same - Google Patents

Over current relay and circuit breaker having the same Download PDF

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KR20140013719A
KR20140013719A KR1020120081936A KR20120081936A KR20140013719A KR 20140013719 A KR20140013719 A KR 20140013719A KR 1020120081936 A KR1020120081936 A KR 1020120081936A KR 20120081936 A KR20120081936 A KR 20120081936A KR 20140013719 A KR20140013719 A KR 20140013719A
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current transformer
connector
cable
signal
error
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KR1020120081936A
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Korean (ko)
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KR101631627B1 (en
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문경주
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엘에스산전 주식회사
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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
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • 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
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
    • 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
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • 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
    • 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
    • G01R31/58—Testing of lines, cables or conductors
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

Disclosed are a overcurrent relay and a breaker including the same. The embodiments of the present invention can detect errors in the cable of the current transformer mounted on the overcurrent relay or a connector by using a simple circuit. The embodiments of the present invention are to prevent a fault trip from detecting the error that may able to be occurred in the current transformer cable or the connector, and the situation that that do not trip when the fault current is occurred. The embodiments of the present invention are to provide stability of the relay and conveniency for a user by supplying a detection fact after detecting the disconnection of the current transformer cable or the failure of the connector. [Reference numerals] (100) Current transformer; (200) Controller; (210) Signal converting unit; (300) Error detection circuit; (400) Filter circuit unit; (500) User interface

Description

과전류 계전기 및 이를 포함한 차단기{OVER CURRENT RELAY AND CIRCUIT BREAKER HAVING THE SAME}OVER CURRENT RELAY AND CIRCUIT BREAKER HAVING THE SAME}

본 발명은 과전류 계전기에 관한 것으로서, 상세하게는 변류기 케이블의 단선이나 커넥터 불량을 검출할 수 있는 과전류 계전기에 관한 것이다.The present invention relates to an overcurrent relay, and more particularly, to an overcurrent relay capable of detecting disconnection of a current transformer cable and a defective connector.

일반적으로, 차단기의 과전류 계전기는, 차단기에 흐르는 전류를 측정하여 과전류나 사고전류를 검출할 경우에 트립(Trip) 신호(차단기 개방 신호)를 발생하는 장치이다. 과전류 계전기는 흔히 흐르는 전류를 측정하기 위해 변류기(Current Transformer; CT)를 사용한다. 즉, 과전류 계전기는 변류기에 흐르는 전류를 검출하여, 과전류나, 지락 등 사고 전류가 발생하면 트립 신호를 발생한다.In general, an overcurrent relay of a breaker is a device that generates a trip signal (breaker open signal) when the current flowing through the breaker is measured to detect an overcurrent or an accident current. Overcurrent relays often use a Current Transformer (CT) to measure the current flowing through it. That is, the overcurrent relay detects the current flowing in the current transformer, and generates a trip signal when an accidental current such as overcurrent or ground fault occurs.

그러나, 종래 기술에 따른 과전류 계전기는, 변류기 케이블이나 케이블 단자에 이상이 생겼을 경우, 과전류나, 순시, 지락 등을 판단할 수 없게 되는 문제점이 있다. 즉, 변류기 케이블에 문제가 생겼을 경우, 과전류가 발생하더라도 변류기가 전류를 검출할 수 없게 되어 과전류 계전기가 트립 신호를 출력할 수 없게 된다. 또, 과전류 계전기는, 노브 설정에 따라 지락으로 판단하여 잘못된 트립 신호를 출력할 수 있다.However, the overcurrent relay according to the prior art has a problem in that overcurrent, instantaneous, ground fault, or the like cannot be determined when an abnormality occurs in the current transformer cable or the cable terminal. That is, when a problem occurs in the current transformer cable, even if an overcurrent occurs, the current transformer cannot detect the current and the overcurrent relay cannot output the trip signal. In addition, the overcurrent relay may determine a ground fault according to the knob setting and output an incorrect trip signal.

본 발명의 실시 예들은 간단한 회로를 이용하여 과전류 계전기 내에 구비된 변류기의 케이블 또는 커넥터의 오류를 검출할 수 있는 과전류 계전기를 제공함에 그 목적이 있다.It is an object of the present invention to provide an overcurrent relay capable of detecting an error in a cable or a connector of a current transformer provided in the overcurrent relay using a simple circuit.

상기 목적을 달성하기 위한 본 발명에 따른 과전류 계전기는, 제어 기판과 커넥터를 통해 연결되고, 계전기에 흐르는 전류를 검출하여 검출 신호를 출력하는 변류기와, 상기 제어 기판에 구비되고, 상기 검출 신호 값과 미리 설정된 기준 값을 비교하여 비교 결과를 근거로 트립 신호를 발생하는 제어기와, 상기 변류기 및 제어기의 사이에 구비되고, 상기 변류기에 연결된 케이블 또는 상기 커넥터의 오류를 검출하는 오류 검출 회로부를 포함하여 구성된다. 상기 제어기는, 상기 검출 신호를 디지털 신호로 변환하는 신호 변환부를 포함한다.An overcurrent relay according to the present invention for achieving the above object is a current transformer connected to a control board and a connector, for detecting a current flowing through the relay and outputting a detection signal, provided on the control board, And a controller for generating a trip signal based on a comparison result by comparing a preset reference value, and an error detection circuit unit provided between the current transformer and the controller and detecting an error of a cable or the connector connected to the current transformer. do. The controller includes a signal converter that converts the detection signal into a digital signal.

일 실시 예에 있어서, 상기 오류 검출 회로부는, 접지와 연결되고, 상기 케이블 또는 상기 커넥터에 오류가 발생하면 상기 신호 변환부의 출력 신호가 제로가 되도록 구성되는 것을 특징으로 한다.In one embodiment, the error detection circuit is connected to the ground, it characterized in that the output signal of the signal converter is configured to be zero when an error occurs in the cable or the connector.

다른 실시 예에 있어서, 상기 오류 검출 회로부는, 상기 제어 기판에 공급되는 입력 전원들 중 하나의 전원과 연결되고, 상기 케이블 또는 상기 커넥터에 오류가 발생하면 상기 신호 변환부가 상기 연결된 전원의 최대 전압을 출력하도록 구성되는 것을 특징으로 한다.In another embodiment, the error detection circuit unit is connected to one of the input powers supplied to the control board, and if an error occurs in the cable or the connector, the signal conversion unit may adjust the maximum voltage of the connected power. And to output.

본 발명의 실시 예들은 간단한 회로를 이용하여 과전류 계전기 내에 구비된 변류기의 케이블 또는 커넥터의 오류를 검출할 수 있다.Embodiments of the present invention can detect the error of the cable or connector of the current transformer provided in the overcurrent relay using a simple circuit.

본 발명의 실시 예들은 간단한 회로를 추가하여, 변류기 케이블이나 커넥터에 발생할 수 있는 오류를 검출함으로써 잘못된 트립의 방지와 사고전류 발생 시에 트립하지 않는 상황을 예방한다.The embodiments of the present invention add a simple circuit to detect a fault that may occur in the current transformer cable or connector, thereby preventing a faulty trip and preventing a situation where a fault does not occur when an accident current occurs.

본 발명의 실시 예들은 변류기 케이블의 단선이나 커넥터 불량을 검출하여 검출 사실을 제공하여 이에 대비하도록 함으로써 계전기의 안정성 및 사용자의 편의성을 제공한다.Embodiments of the present invention provide a detection fact by detecting the disconnection of the current transformer cable or a connector failure to provide a detection fact to provide the stability of the relay and the user's convenience.

도 1은 본 발명에 따른 과전류 계전기의 구성을 개략적으로 보인 블록도;
도 2 및 도 3은 본 발명의 실시 예들에 따른 과전류 계전기를 보인 회로도들; 및
도 4는 본 발명의 실시 예들에 따른 과전류 계전기가 구비된 기중차단기를 보인 도이다.1 is a block diagram schematically showing the configuration of an overcurrent relay according to the present invention;
2 and 3 are circuit diagrams showing an overcurrent relay according to embodiments of the present invention; And
4 is a diagram illustrating an air circuit breaker having an overcurrent relay according to embodiments of the present invention.

도 1을 참조하면, 본 발명에 따른 과전류 계전기는, 변류기(100)와, 제어기(200)와, 오류 검출 회로부(300)를 포함하여 구성된다.Referring to FIG. 1, the overcurrent relay according to the present invention includes a current transformer 100, a controller 200, and an error detection circuit unit 300.

변류기(100)는, 제어 기판과 커넥터를 통해 연결되고, 계전기에 흐르는 전류를 검출하여 검출 신호를 출력한다. 변류기(100)는, Current Transformer(CT)로서, 과전류 계전기에 흐르는 교류의 큰 전류로부터 이에 비례하는 작은 전류를 얻는 장치이다. 변류기(100)는, 변압기와 같은 성층철심에 권선수가 적은 1차 코일과 권선수가 많은 2차 코일을 감은 것인데, 2차 코일은 과전류 계전기의 제어기(200)에 연결된다. 1차, 2차의 전류비는 각기 코일 권선수의 반비(反比)와 비슷하다.The current transformer 100 is connected via a control board and a connector, detects a current flowing through the relay, and outputs a detection signal. The current transformer 100 is a current transformer (CT) that obtains a small current proportional to a large current of an alternating current flowing in an overcurrent relay. The current transformer 100 is wound around a primary coil having a small number of turns and a secondary coil having a large number of turns on a stratified core such as a transformer, and the secondary coil is connected to the controller 200 of the overcurrent relay. The current ratios of the primary and secondary are similar to the half ratio of the number of coil turns, respectively.

제어기(200)는, 상기 검출 신호 값과 미리 설정된 기준 값을 비교하여 비교 결과를 근거로 트립 신호를 발생한다. 여기서, 기준 값은 과전류 계전기 또는 과전류 계전기가 구비된 차단기의 종류나 형태에 따라 달라진다. 또, 과전류 계전기에 사용되는 변류기의 종류나 형태, 회로 구성 등에 의해서도 기준 값이 달라질 수 있다.The controller 200 compares the detection signal value with a preset reference value and generates a trip signal based on the comparison result. Here, the reference value depends on the type or form of the overcurrent relay or the circuit breaker with the overcurrent relay. The reference value may also vary depending on the type, shape, circuit configuration, and the like of the current transformer used in the overcurrent relay.

도 1을 참조하면, 제어기(200)는, 상기 검출 신호를 디지털 신호로 변환하는 신호 변환부(210)를 포함한다. 신호 변환부(210)는 아날로그 신호를 디지털 신호로 변환하는 아날로그-디지털 변환기(Analog-Digital Converter; ADC)로서, 아날로그 신호인 변류기의 검출 신호를 디지털 신호로 변환한다.Referring to FIG. 1, the controller 200 includes a signal converter 210 that converts the detection signal into a digital signal. The signal converter 210 is an analog-to-digital converter (ADC) for converting an analog signal into a digital signal, and converts a detection signal of a current transformer, which is an analog signal, into a digital signal.

오류 검출 회로부(300)는, 상기 변류기(100) 및 제어기(200)의 사이에 구비되고, 상기 변류기(100)에 연결된 케이블 또는 상기 커넥터의 오류를 검출한다.The error detection circuit unit 300 is provided between the current transformer 100 and the controller 200 and detects an error of a cable or a connector connected to the current transformer 100.

도 2를 참조하면, 일 실시 예에 따른 과전류 계전기에 있어서, 오류 검출 회로부(300)는, 접지와 연결된다. 오류 검출 회로부(300)는, 변류기(300)와 제어 기판(11), 즉 변류기(300)와 제어기(200)가 연결된 상기 케이블 또는 상기 커넥터(C1, C2)에 오류가 발생하면 상기 신호 변환부(210)의 출력 신호가 제로가 되도록 구성되는 것을 특징으로 한다.Referring to FIG. 2, in the overcurrent relay according to an exemplary embodiment, the error detection circuit unit 300 is connected to the ground. The error detection circuit unit 300 may output the signal converter when an error occurs in the cable or the connectors C1 and C2 connected to the current transformer 300 and the control board 11, that is, the current transformer 300 and the controller 200. Characterized in that the output signal of (210) is configured to be zero.

즉, 오류 검출 회로부(300)는, 변류기(100)와 제어기(200)의 사이에 접지에 연결되는 소자(예, 저항)을 추가하여 변류기 케이블이나, 커넥터(C1, C2)에 문제가 발생하였을 시, ADC 신호가 0으로 나올 수 있게 하여, 사고 전류인지 아닌지 판단을 할 수 있게 한다. That is, the error detection circuit unit 300 may add an element (eg, a resistor) connected to the ground between the current transformer 100 and the controller 200 to cause a problem in the current transformer cable or the connectors C1 and C2. At this time, the ADC signal can come out to 0, so that it can be judged whether or not the fault current.

도 3을 참조하면, 다른 실시 예에 따른 과전류 계전기에 있어서, 오류 검출 회로부(300)는, 상기 제어 기판에 공급되는 입력 전원들 중 하나의 전원과 연결된다. 예를 들어, 오류 검출 회로부(300)는 3.3V, 5V, 12V 등의 제어기에 공급되는 공급 전원에 연결될 수 있다. 오류 검출 회로부(300)는, 상기 케이블 또는 상기 커넥터에 오류가 발생하면 신호 변환부(210)가 연결된 전원의 최대 전압을 출력하도록 구성되는 것을 특징으로 한다.Referring to FIG. 3, in an overcurrent relay according to another exemplary embodiment, the error detection circuit unit 300 is connected to one of the input powers supplied to the control board. For example, the error detection circuit unit 300 may be connected to a supply power supplied to a controller such as 3.3V, 5V, 12V, or the like. The error detection circuit unit 300 may be configured to output a maximum voltage of a power supply to which the signal conversion unit 210 is connected when an error occurs in the cable or the connector.

즉, 오류 검출 회로부(300)는, 변류기(100)와 제어기(200)의 사이에 V(예, Vdc)에 연결되는 소자(예, 저항)를 추가하여 변류기 케이블이나 커넥터에 문제가 발생하였을 시, ADC신호가 Vdc에 맞는 신호가 출력되어 판단을 할 수 있게 한다. Vdc값이 AD해상도에 따라 가장 높은 값이 검출되어 사용자가 사고전류인지 아닌지 판단할 수 있다.That is, the error detection circuit unit 300 adds an element (eg, a resistor) connected to V (eg, Vdc) between the current transformer 100 and the controller 200 to cause a problem in the current transformer cable or connector. In this case, the ADC signal is outputted to Vdc and can be judged. The highest value of Vdc is detected according to AD resolution, and it is possible to determine whether the user is an accident current.

도 1을 다시 참조하면, 상기 과전류 계전기(10)는, 변류기 케이블 또는 커넥터에 발생한 오류 사실을 외부에 출력하는 사용자 인터페이스(500)를 더 포함하여 구성될 수 있다.Referring back to FIG. 1, the overcurrent relay 10 may further include a user interface 500 that externally outputs the fact that an error occurred in the current transformer cable or the connector.

사용자 인터페이스(500)는 변류기에 오류가 발생하면, 즉 변류기 케이블의 단선이나 커넥터 불량을 검출하면 검출 사실을 화면을 통해 출력하는 출력부를 포함할 수 있다. 출력부는 발광 다이오드(Light Emitting Diode; LED), 액정 표시 장치(Liquid Crystal Display; LCD), 플라즈마 표시 패널(Plasma Display Panel), 유기 발광 다이오드(Organic Light Emitting Diode; OLED) 중 어느 하나의 소자로 형성될 수 있다. The user interface 500 may include an output unit that outputs a detection fact through a screen when an error occurs in the current transformer, that is, when disconnection of the current transformer cable or a bad connector is detected. The output unit is formed of any one of a light emitting diode (LED), a liquid crystal display (LCD), a plasma display panel, and an organic light emitting diode (OLED). Can be.

사용자 인터페이스(500)는 변류기에 오류가 발생하면, 즉 변류기 케이블의 단선이나 커넥터 불량을 검출하면 검출 사실을 주변에 출력하는 음성 출력부를 더 포함할 수 있다. 음성 출력부는 소리, 음성을 출력하는 수단으로서, 비퍼(beeper), 스피커(speaker) 등을 포함한다.The user interface 500 may further include a voice output unit that outputs a detection fact to the surroundings when an error occurs in the current transformer, that is, when a disconnection of the current transformer cable or a defective connector is detected. The voice output unit is a means for outputting a sound and a voice, and includes a beeper and a speaker.

도 4는, 본 발명의 실시 예들에 따른 과전류 계전기가 구비되는 차단기의 일 예로서, 기중 차단기를 도시한다. 도면에는 기중 차단기만을 도시하였으나, 다른 차단기, 예를 들어 배선용 차단기, 누전 차단기 등에도 상기 과전류 계전기가 구비될 수 있다.4 illustrates an air circuit breaker as an example of a circuit breaker having an overcurrent relay according to embodiments of the present disclosure. Although only the air circuit breaker is illustrated in the drawing, the overcurrent relay may be provided in another circuit breaker, for example, a circuit breaker or an earth leakage breaker.

기중 차단기(Air Circuit Breaker)는, 교류전압 1000V 이하 및 직류전압 3000V 이하의 전로에 사용하고, 회로의 개폐나 단락사고에 의한 단락전류 등에서 전로를 보존하기 위한 차단기이다. 합성 수지 절연 케이스 내에 차단부를 넣어 교류 600V 이하, 직류 250V 이하의 전로에 사용하는 차단기는 배선용 차단기라 한다. An air circuit breaker is a circuit breaker which is used for converters having an AC voltage of 1000 V or less and a DC voltage of 3000 V or less, and saves the circuits in a short circuit current due to opening and closing of a circuit or a short circuit accident. The circuit breaker used for the circuit of 600V or less of AC and 250V or less of AC by inserting the breaker in the PVC insulation case is called a circuit breaker.

도 4를 참조하면, 기중 차단기는, 기중 차단기 본체(21)와, 기중 차단기 본체(21)의 전면에 부착되며 수용 홈(25)이 관통 형성된 커버(23)를 포함하여 구성된다. 여기서, 과전류 계전기(10)는 상기 수용 홈(25)에 수용된다.Referring to FIG. 4, the air circuit breaker includes a air circuit breaker main body 21 and a cover 23 attached to the front surface of the air circuit breaker main body 21 and having a receiving groove 25 therethrough. Here, the overcurrent relay 10 is accommodated in the receiving groove 25.

이상 설명한 바와 같이, 본 발명의 실시 예들에 따른 과전류 계전기 및 이를 포함한 차단기는, 간단한 오류 검출 회로부를 이용하여 과전류 계전기 내에 구비된 변류기의 케이블 또는 커넥터의 오류를 검출할 수 있다. 본 발명의 실시 예들은 간단한 회로를 추가하여, 변류기 케이블이나 커넥터에 발생할 수 있는 오류를 검출함으로써 잘못된 트립의 방지와 사고전류 발생 시에 트립하지 않는 상황을 예방한다. 본 발명의 실시 예들은 변류기 케이블의 단선이나 커넥터 불량을 검출하여 검출 사실을 제공하여 이에 대비하도록 함으로써 계전기의 안정성 및 사용자의 편의성을 제공한다.As described above, the overcurrent relay and the circuit breaker including the same according to embodiments of the present invention may detect an error of a cable or a connector of the current transformer provided in the overcurrent relay using a simple error detection circuit. The embodiments of the present invention add a simple circuit to detect a fault that may occur in the current transformer cable or connector, thereby preventing a faulty trip and preventing a situation where a fault does not occur when an accident current occurs. Embodiments of the present invention provide a detection fact by detecting the disconnection of the current transformer cable or a connector failure to provide a detection fact to provide the stability of the relay and the user's convenience.

10: 과전류 계전기 11: 제어 기판
100: 변류기 200: 제어기
300: 오류 검출 회로부 400: 필터 회로부
500: 사용자 인터페이스10: overcurrent relay 11: control board
100: current transformer 200: controller
300: error detection circuit 400: filter circuit
500: user interface

Claims (3)

제어 기판과 커넥터를 통해 연결되고, 계전기에 흐르는 전류를 검출하여 검출 신호를 출력하는 변류기;
상기 검출 신호를 필터링하는 필터 회로부;
상기 제어 기판에 구비되고, 상기 검출 신호를 디지털 신호로 변환하는 신호 변환부를 구비하며, 상기 검출 신호 값과 미리 설정된 기준 값을 비교하여 비교 결과를 근거로 트립 신호를 발생하는 제어기; 및
상기 변류기 및 제어기의 사이에 구비되고, 상기 변류기에 연결된 케이블 또는 상기 커넥터의 오류를 검출하는 오류 검출 회로부;를 포함하는 과전류 계전기.A current transformer connected to the control board through a connector and detecting a current flowing through the relay and outputting a detection signal;
A filter circuit unit for filtering the detection signal;
A controller provided in the control board, the signal converting unit converting the detection signal into a digital signal, and comparing the detection signal value with a preset reference value to generate a trip signal based on a comparison result; And
And an error detection circuit unit provided between the current transformer and the controller and detecting an error of the cable or the connector connected to the current transformer. 제1 항에 있어서,
상기 오류 검출 회로부는,
접지와 연결되고, 상기 케이블 또는 상기 커넥터에 오류가 발생하면 상기 신호 변환부의 출력 신호가 제로가 되도록 구성되는 것을 특징으로 하는 과전류 계전기.The method according to claim 1,
The error detection circuit unit,
And an output signal of the signal converter is zero when an error occurs in the cable or the connector. 제1 항에 있어서,
상기 오류 검출 회로부는,
상기 제어 기판에 공급되는 입력 전원들 중 하나의 전원과 연결되고, 상기 케이블 또는 상기 커넥터에 오류가 발생하면 상기 신호 변환부가 상기 연결된 전원의 최대 전압을 출력하도록 구성되는 것을 특징으로 하는 과전류 계전기.The method according to claim 1,
The error detection circuit unit,
An overcurrent relay connected to one of input powers supplied to the control board and configured to output a maximum voltage of the connected power supply when an error occurs in the cable or the connector.
KR1020120081936A 2012-07-26 2012-07-26 Over current relay and circuit breaker having the same KR101631627B1 (en)

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