WO2015053479A1 - Device for detecting open phase of connection line of nuclear power plant and open phase detecting method therefor - Google Patents

Device for detecting open phase of connection line of nuclear power plant and open phase detecting method therefor Download PDF

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Publication number
WO2015053479A1
WO2015053479A1 PCT/KR2014/008147 KR2014008147W WO2015053479A1 WO 2015053479 A1 WO2015053479 A1 WO 2015053479A1 KR 2014008147 W KR2014008147 W KR 2014008147W WO 2015053479 A1 WO2015053479 A1 WO 2015053479A1
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Prior art keywords
transformer
phase
signal
power plant
nuclear power
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PCT/KR2014/008147
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French (fr)
Korean (ko)
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하체웅
이도환
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한국수력원자력 주식회사
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Publication of WO2015053479A1 publication Critical patent/WO2015053479A1/en

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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21D—NUCLEAR POWER PLANT
    • G21D3/00—Control of nuclear power plant
    • G21D3/04—Safety arrangements
    • 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
    • H02H3/16—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 fault current to earth, frame or mass
    • H02H3/162—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 fault current to earth, frame or mass for ac systems
    • H02H3/165—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 fault current to earth, frame or mass for ac systems for three-phase systems
    • 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
    • H02H3/48—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 loss of synchronism
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin

Definitions

  • the present invention relates to a phase detection apparatus for detecting phase loss on a transformer connection line in a nuclear power plant using an image current transformer, and a phase detection method thereof.
  • the US NRC calls for the establishment of a system that can detect phase loss of power lines connected to transformers in power plants, not only for nuclear power plants and nuclear power plants under construction, but also for power plant models in the design certification stage.
  • the Korea Institute of Nuclear Safety (KINS) The Korea Institute of Nuclear Safety is likely to require that measures be established in the future.
  • the transformer protection relay system in the nuclear power plant currently in use is in operation with low voltage relay, over current relay, and differential differential relay, but it does not detect if an open phase occurs in the line connected to the atmospheric transformer.
  • An object of the present invention is to provide a phase detection apparatus for detecting phase loss on a transformer connection line in a nuclear power plant using an image current transformer and a method for detecting the phase loss.
  • the nuclear power plant transformer connection line phase detection apparatus for achieving the above object includes an image current transformer and the phase detection unit installed in the neutral line of the primary Y connection of the transformer used in the nuclear power plant.
  • the imaging detector determines that an imaging has occurred in the transformer side when the effective value of the image current induced in the current transformer is maintained for more than a predetermined reference time or more.
  • the image detection unit may include: an input unit configured to receive the image current signal from the image current transformer; A gain adjusting unit for amplifying the video signal provided by the input unit with a preset gain; A low pass filter filtering the signal amplified by the gain adjusting unit; A sample and hold unit and a digital conversion unit converting the output of the low pass filter unit into a digital image signal; And a digital signal processor that calculates the effective value based on the digital image signal output from the digital converter, and determines whether the calculated effective value is maintained for a preset reference time or more.
  • the phase detection unit of the present invention generates an alarm signal in the case of the phase of the transformer side and provides to the main controller to respond to the administrator or to provide a trip signal to the secondary circuit breaker of the transformer Can be opened.
  • a phase detection method of a phase detection apparatus comprising: installing an image current transformer on a neutral line of a primary Y connection of the transformer, and receiving an image current induced by the input unit in the image current transformer; Amplifying the video signal provided by the input unit with a preset gain; Lowpass filtering the amplified signal; Converting the lowpass filtered analog signal into a digital video signal; And calculating the effective value based on the digital image signal, and determining that an imaging occurs on the transformer side when the calculated effective value is maintained for a predetermined reference time or longer.
  • the phase detection apparatus of the present invention detects an image current flowing through the neutral line of the transformer Y connection side through a current transformer when an image formation occurs during normal operation on a line connected to a transformer in a nuclear power plant, and when the detected image current persists for a predetermined time, Alarms can be sent to the Main Control Room (MCR).
  • MCR Main Control Room
  • the nuclear plant manager can take appropriate action as soon as an open phase occurs on the nuclear power plant transformer connection line.
  • phase detection apparatus of the present invention can open a circuit breaker on the secondary side of the transformer when the phase loss occurs to prevent current from flowing through the transformer.
  • FIG. 1 is a block diagram of a phase connection detection device for a transformer connection line for a nuclear power plant of the present invention
  • FIG. 2 is a flowchart provided to explain an operation of an imaging detection apparatus according to an exemplary embodiment.
  • the nuclear power plant transformer connection line phase detection device 100 of the present invention includes an image current transformer 110 and an phase detection unit 130 to detect whether or not phase loss occurs on a transformer 10 connection line in a nuclear power plant. .
  • the image current transformer 110 is installed in the neutral line (N) 11 of the primary Y connection of the transformer 10 in the nuclear power plant. Since the neutral line 11 of the Y connection is grounded to the ground, the image current transformer 110 detects an image current flowing to the ground along the neutral line 11 according to the electromagnetic induction phenomenon. The image current transformer 110 is connected to the image detection unit 130.
  • the imaging detector 130 may include an input unit 131, a gain adjusting unit 133, a low pass filter 135, a sample and hold unit 137, and a digital converter (ADC). to digital converter (139) and digital signal processing unit (141), and connected to a main controller (30) and / or a transformer (10) breaker on the secondary side installed in the main control room (MCR). .
  • the phase detection unit 130 determines whether the phase of the transformer 10 is connected to the transformer 10 using the current transformer 110, and generates a predetermined alarm signal to be installed in the main control room (MCR) when the phase is determined to be missing. Transmission to main controller 30 or to open a breaker (not shown) of the secondary side of the transformer (10).
  • the input unit 131 receives an image current signal detected by the current transformer 110 and provides it to the gain adjusting unit 133.
  • the gain adjusting unit 133 amplifies the analog image current signal input by the input unit 131 with a predetermined gain (gain, amplification factor) and provides the same to the low pass filter unit 135.
  • the low pass filter 135 filters the image current signal amplified by the gain adjusting unit 133 to a predetermined low frequency band, removes high frequency noise, and provides the same to the sample and hold unit 137.
  • the sample and hold unit 137 captures (samples) the analog current signal filtered by the low pass filter unit 135 according to a preset sampling frequency and maintains the signal generated by maintaining the signal until the next sampling period to the digital converter 139. to provide. If the digital converter 139 has a sample and hold function in the process of converting an analog signal into a digital signal, the sample and hold unit 137 may be omitted.
  • the digital converter 139 converts the current signal sampled and held by the sample and hold unit 137 into a plurality of bits of digital signals and provides the digital signal to the digital signal processor 141.
  • the digital signal processor 141 first calculates an effective value of the image current flowing along the neutral line 11 to the ground based on the digital signal received from the digital converter 139, and (2) the calculated magnitude of the effective value. (3) If it is continuously maintained within a preset range for more than a predetermined time, it is determined that an imaging has occurred on the transformer 10 side.
  • the digital signal processing unit 141 transmits an alarm signal to the main controller 30 of the main control room, thereby causing the main controller 30 to inform the manager of an open phase of the transformer connection line.
  • the digital signal processor 141 may control the breaker to be open by providing a trip signal to a breaker (not shown) on the secondary side of the transformer 10.
  • phase detection apparatus 100 of the present invention will be described with reference to FIG. 2.
  • the input unit 131 is configured such that the image current transformer 110 installed in the neutral line 11
  • the detected image fraction current signal is received (S201).
  • the analog image signal input to the input unit 131 is amplified by the gain adjusting unit 133 at a preset amplification factor, and then passed through the low pass filter unit 135 to remove noise and filter only the desired image current.
  • the analog signal filtered by the low pass filter 135 is converted into a digital signal through the sample and hold unit 137 and the digital converter 139.
  • the digital signal processing unit 141 processes the signal provided by the digital conversion unit 139 to detect whether or not an imaging occurs in the nuclear power plant transformer connection line.
  • the effective value of the image current is calculated using the digital signal received from the digital converter 139.
  • the digital signal processor 141 determines whether (1) the magnitude of the calculated effective value is continuously maintained within the preset range (2) for a predetermined time or more (S207).
  • the digital signal processor 141 determines that an imaging has occurred on the transformer 10 side (S209).
  • step S201 If the effective value of the image current is not within the preset size range or if the effective value is not continuously maintained for more than the preset time even if the effective value is within the preset size range, it is determined that the corresponding image current is not due to an open phase on the transformer 10 side. And the process returns to step S201 again.
  • the digital signal processing unit 141 transmits an alarm signal to the main controller 30 of the main control room, thereby causing the main controller 30 of the transformer connection line. Inform the manager of the missing phase.
  • the digital signal processor 141 may control the breaker to be open by providing a trip signal to a breaker (not shown) on the secondary side of the transformer 10.
  • the present invention can be applied to a phase detection device for detecting phase loss on a transformer connection line in a nuclear power plant using an image current transformer and a phase detection method thereof.

Abstract

Disclosed are a device for detecting an open phase of a connection line of a nuclear power plant and an open phase detecting method therefor. The open phase detecting device, according to the present invention, has a zero-phase current transformer provided at a neutral wire of a Y-connection on a primary side of a transformer used for the nuclear power plant, and determines that the open phase has occurred in the transformer when an actual value of a zero-phase current induced into the zero-phase current transformer is maintained at a pre-set reference value or higher for a pre-set reference time or more. The detecting device of the present invention generates an alert and provides the same to a main controller (30) so as to allow an administrator to take appropriate measures or to stop the operation of the transformer by opening a circuit breaker on a secondary side of the transformer when it is has been determined there is an open phase.

Description

원자력발전소 연결 선로 결상 검출장치 및 그 결상 검출방법Defect detection device for connecting line of nuclear power plant and its detection method
본 발명은 영상 변류기를 이용하여 원자력발전소 내 변압기 연결 선로 상의 결상을 검출하는 결상 검출장치 및 그 결상 검출방법에 관한 것이다.The present invention relates to a phase detection apparatus for detecting phase loss on a transformer connection line in a nuclear power plant using an image current transformer, and a phase detection method thereof.
원자력발전소 변압기 연결 선로 결상(Open Phase) 검출 시스템에 관한 발명은 아직까지 잘 알려지지 않았다.The invention of an open phase detection system for a nuclear power plant transformer connection line is not well known.
최근 미국 바이런(Byron) 원자력 발전소 내에서 정상 운전 중 변압기 1차 측 송전선로를 지지하고 있는 'C' 상 애자의 파손으로 결상이 발생하면서 최종적으로 원자로까지 정지하였고, 발전소 내 전원 상 불평형으로 약 8 분간의 과도 현상이 발생한 경험이 2차례 있었다. 미국 원자력규제위원회(NRC: Nuclear Regulatory Commission)에서 조사한 결과 다른 발전소에서도 비슷한 현상을 경험하였다는 보고가 있었다.In the Byron nuclear power plant, the reactor was finally shut down due to breakage of the 'C' phase insulator supporting the transformer primary transmission line during normal operation. There were two episodes of transient transients. Investigations by the Nuclear Regulatory Commission (NRC) have reported similar experiences at other plants.
미국 NRC에서는 가동 원전, 건설 중인 원전뿐만 아니라 디자인 확정(Design Certification) 단계의 발전소 모델에 대해서도 발전소 내 변압기와 연결된 전력선의 결상을 검출할 수 있는 시스템을 구축하라고 요구하고 있으며, 한국원자력안전기술원(KINS: Korea Institute of Nuclear Safety)에서도 향후에는 미국과 같이 대책을 구축하라고 요구할 가능성이 높다.The US NRC calls for the establishment of a system that can detect phase loss of power lines connected to transformers in power plants, not only for nuclear power plants and nuclear power plants under construction, but also for power plant models in the design certification stage. The Korea Institute of Nuclear Safety (KINS) The Korea Institute of Nuclear Safety is likely to require that measures be established in the future.
현재 사용 중인 원자력 발전소 내 변압기 보호계전 시스템은 저전압 계전기, 과전류 계전기, 비율차동 계전기 등이 설치되어 운영 중에 있지만 대기변압기가 연결된 선로에서 결상이 발생하는 경우 검출하지 못한다.The transformer protection relay system in the nuclear power plant currently in use is in operation with low voltage relay, over current relay, and differential differential relay, but it does not detect if an open phase occurs in the line connected to the atmospheric transformer.
따라서 원자력 발전소 내 변압기가 연결된 선로에서 결상이 발생하더라도 검출이 불가능하다. 나아가 이러한 소외 전력계통(Off-Site Electrical System)의 고장이 안전 등급 발전소 내 전력계통으로 파급되어 전력기기 파손이나 원자로 정지 등의 문제를 일으킬 수 있다.Therefore, it is impossible to detect an open phase in a line connected with a transformer in a nuclear power plant. Furthermore, the failure of the off-site electrical system can spread to power systems in safety-class power plants, which can cause problems such as damage to power equipment and reactor shutdown.
본 발명의 목적은, 영상 변류기를 이용하여 원자력발전소 내 변압기연결 선로 상의 결상을 검출하는 결상 검출장치 및 그 결상 검출방법을 제공함에 있다.An object of the present invention is to provide a phase detection apparatus for detecting phase loss on a transformer connection line in a nuclear power plant using an image current transformer and a method for detecting the phase loss.
상기 목적을 달성하기 위한 본 발명에 따른 원자력발전소 변압기 연결 선로 결상 검출장치는 원자력 발전소에 사용되는 변압기의 1차 측 Y 결선의 중성선에 설치된 영상 변류기와, 결상검출부를 포함한다. 결상검출부는 상기 영상 변류기에 유도된 영상 전류의 실효치가 기 설정된 기준값 이상으로 기 설정된 기준시간 이상 유지되는 경우에, 상기 변압기 측에 결상이 발생한 것으로 판단한다.The nuclear power plant transformer connection line phase detection apparatus according to the present invention for achieving the above object includes an image current transformer and the phase detection unit installed in the neutral line of the primary Y connection of the transformer used in the nuclear power plant. The imaging detector determines that an imaging has occurred in the transformer side when the effective value of the image current induced in the current transformer is maintained for more than a predetermined reference time or more.
실시 예에 따라, 상기 결상검출부는, 상기 영상변류기로부터 상기 영상 전류 신호를 입력받는 입력부; 상기 입력부가 제공하는 영상 신호를 기 설정된 이득으로 증폭하는 이득조정부; 상기 이득조정부에서 증폭된 신호를 필터링하는 저역통과필터부; 상기 저역통과필터부의 출력을 디지털 영상 신호로 변환하는 샘플앤홀드부와 디지털변환부; 및 상기 디지털변환부에서 출력되는 디지털 영상신호를 기초로 상기 실효치를 계산하고, 상기 계산된 실효치가 기 설정된 기준값 이상으로 기 설정된 기준 시간 이상 유지되는지 판단하는 디지털신호처리부를 포함할 수 있다.According to an embodiment, the image detection unit may include: an input unit configured to receive the image current signal from the image current transformer; A gain adjusting unit for amplifying the video signal provided by the input unit with a preset gain; A low pass filter filtering the signal amplified by the gain adjusting unit; A sample and hold unit and a digital conversion unit converting the output of the low pass filter unit into a digital image signal; And a digital signal processor that calculates the effective value based on the digital image signal output from the digital converter, and determines whether the calculated effective value is maintained for a preset reference time or more.
다른 실시 예에 따라, 본 발명의 결상검출부는 상기 변압기 측 결상이 있는 경우에 경보신호를 생성하여 주제어기에게 제공하여 관리자가 대처하도록 하거나 상기 변압기의 2차측 차단기에게 트립신호를 제공하는 상기 차단기를 오픈(Open)시킬 수 있다.According to another embodiment of the present invention, the phase detection unit of the present invention generates an alarm signal in the case of the phase of the transformer side and provides to the main controller to respond to the administrator or to provide a trip signal to the secondary circuit breaker of the transformer Can be opened.
본 발명의 또 다른 실시 예에 따른 결상 검출장치의 결상 검출방법은, 상기 변압기의 1차 측 Y 결선의 중성선에 영상 변류기를 설치하고, 입력부가 상기 영상 변류기에 유도된 영상 전류를 입력받는 단계; 상기 입력부가 제공하는 영상 신호를 기 설정된 이득으로 증폭하는 단계; 상기 증폭된 신호를 저역통과 필터링하는 단계; 상기 저역통과 필터링된 아날로그 신호를 디지털 영상 신호로 변환하는 단계; 및 상기 디지털 영상신호를 기초로 상기 실효치를 계산하고, 상기 계산된 실효치가 기 설정된 기준값 이상으로 기 설정된 기준 시간 이상 유지되는 경우에 상기 변압기 측에 결상이 발생한 것으로 판단하는 단계를 포함한다.According to still another aspect of the present invention, there is provided a phase detection method of a phase detection apparatus, comprising: installing an image current transformer on a neutral line of a primary Y connection of the transformer, and receiving an image current induced by the input unit in the image current transformer; Amplifying the video signal provided by the input unit with a preset gain; Lowpass filtering the amplified signal; Converting the lowpass filtered analog signal into a digital video signal; And calculating the effective value based on the digital image signal, and determining that an imaging occurs on the transformer side when the calculated effective value is maintained for a predetermined reference time or longer.
본 발명의 결상 검출장치는 원자력발전소 내 변압기가 연결된 선로에서 정상 운전 중 결상이 발생하였을 때 변압기 Y 결선 측 중성선에 흐르는 영상전류를 변류기를 통해 검출하고 검출된 영상전류가 일정시간 지속되었을 경우 주제어실(MCR: Main Control Room)에 경보를 전송할 수 있다. 이에 따라, 원자력발전소 변압기 연결 선로에 결상이 발생한 즉시, 원자력 발전소 관리자가 적절한 조치를 취할 수 있다.The phase detection apparatus of the present invention detects an image current flowing through the neutral line of the transformer Y connection side through a current transformer when an image formation occurs during normal operation on a line connected to a transformer in a nuclear power plant, and when the detected image current persists for a predetermined time, Alarms can be sent to the Main Control Room (MCR). As a result, the nuclear plant manager can take appropriate action as soon as an open phase occurs on the nuclear power plant transformer connection line.
또한, 본 발명의 결상 검출장치는 결상이 발생한 경우에 변압기 2차측의 차단기를 오픈(Open)하여 변압기로 전류가 흐르지 않도록 할 수 있다.In addition, the phase detection apparatus of the present invention can open a circuit breaker on the secondary side of the transformer when the phase loss occurs to prevent current from flowing through the transformer.
도 1은 본 발명의 원자력발전소용 변압기 연결 선로 결상 검출장치의 블록도, 그리고 1 is a block diagram of a phase connection detection device for a transformer connection line for a nuclear power plant of the present invention, and
도 2는 본 발명의 일 실시 예에 따른 결상 검출장치의 동작 설명에 제공되는 흐름도이다.2 is a flowchart provided to explain an operation of an imaging detection apparatus according to an exemplary embodiment.
이하 도면을 참조하여 본 발명을 더욱 상세히 설명한다.Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.
도 1을 참조하면, 본 발명의 원자력 발전소 변압기 연결 선로 결상검출장치(100)는 영상 변류기(110)와 결상검출부(130)를 구비하여 원자력 발전소 내의 변압기(10) 연결선로 상의 결상 여부를 검출한다.Referring to FIG. 1, the nuclear power plant transformer connection line phase detection device 100 of the present invention includes an image current transformer 110 and an phase detection unit 130 to detect whether or not phase loss occurs on a transformer 10 connection line in a nuclear power plant. .
영상 변류기(110)는 원자력 발전소 내의 변압기(10)의 1차 측 Y 결선의 중성선(N)(11)에 설치된다. Y 결선의 중성선(11)은 대지에 접지되기 때문에, 영상 변류기(110)는 전자기 유도 현상에 따라 중성선(11)을 따라 대지로 흐르는 영상 전류를 검출하게 된다. 영상 변류기(110)는 결상검출부(130)에 연결된다.The image current transformer 110 is installed in the neutral line (N) 11 of the primary Y connection of the transformer 10 in the nuclear power plant. Since the neutral line 11 of the Y connection is grounded to the ground, the image current transformer 110 detects an image current flowing to the ground along the neutral line 11 according to the electromagnetic induction phenomenon. The image current transformer 110 is connected to the image detection unit 130.
결상검출부(130)는 입력부(131), 이득조정부(133), 저역통과필터부(Loe Pass Filter)(135), 샘플앤홀드부(Sample & Hold)(137), 디지털변환부(ADC:Analog to Digital Converter)(139) 및 디지털신호처리부(141)를 포함하며, 주제어실(MCR: Main Control Room)에 설치된 주제어기(30) 및(또는) 변압기(10) 2차 측의 차단기 등과 연결된다. 결상검출부(130)는 영상 변류기(110)를 이용하여 변압기(10) 연결 선로 상의 결상 여부를 판단하고, 결상 상태로 판단되면 소정의 알람 신호를 생성하여 주제어실(MCR: Main Control Room)에 설치된 주제어기(30)로 전송하거나 변압기(10) 2차 측의 차단기(미도시)를 오픈(Open)시킨다.The imaging detector 130 may include an input unit 131, a gain adjusting unit 133, a low pass filter 135, a sample and hold unit 137, and a digital converter (ADC). to digital converter (139) and digital signal processing unit (141), and connected to a main controller (30) and / or a transformer (10) breaker on the secondary side installed in the main control room (MCR). . The phase detection unit 130 determines whether the phase of the transformer 10 is connected to the transformer 10 using the current transformer 110, and generates a predetermined alarm signal to be installed in the main control room (MCR) when the phase is determined to be missing. Transmission to main controller 30 or to open a breaker (not shown) of the secondary side of the transformer (10).
입력부(131)는 변류기(110)가 검출한 영상분 전류 신호를 입력받아, 이득조정부(133)에게 제공한다. 이득조정부(133)는 입력부(131)가 입력받은 아날로그 영상분 전류신호를 기 설정된 이득(Gain, 증폭율)으로 증폭하여 저역통과필터부(135)에게 제공한다.The input unit 131 receives an image current signal detected by the current transformer 110 and provides it to the gain adjusting unit 133. The gain adjusting unit 133 amplifies the analog image current signal input by the input unit 131 with a predetermined gain (gain, amplification factor) and provides the same to the low pass filter unit 135.
저역통과필터부(135)는 이득조정부(133)에서 증폭된 영상분 전류 신호를 설정된 저주파 대역으로 필터링하여 고주파 잡음 등을 제거한 다음 샘플앤홀드부(137)에게 제공한다. 샘플앤홀드부(137)는 기 설정된 샘플링 주파수에 따라 저역통과필터부(135)에서 필터링된 아날로그 전류 신호를 캡쳐(샘플링)하고 다음 샘플링 주기까지 유지하여 생성한 신호를 디지털변환부(139)에게 제공한다. 디지털변환부(139)가 아날로그 신호를 디지털 신호로 변환하는 과정에서 샘플앤 홀드 기능을 구비한 경우라면 샘플앤홀드부(137)가 생략될 수도 있다.The low pass filter 135 filters the image current signal amplified by the gain adjusting unit 133 to a predetermined low frequency band, removes high frequency noise, and provides the same to the sample and hold unit 137. The sample and hold unit 137 captures (samples) the analog current signal filtered by the low pass filter unit 135 according to a preset sampling frequency and maintains the signal generated by maintaining the signal until the next sampling period to the digital converter 139. to provide. If the digital converter 139 has a sample and hold function in the process of converting an analog signal into a digital signal, the sample and hold unit 137 may be omitted.
디지털변환부(139)는 샘플앤홀드부(137)가 샘플링하여 유지하는 전류 신호를 복수 비트의 디지털 신호로 변환하여 디지털신호처리부(141)에게 제공한다.The digital converter 139 converts the current signal sampled and held by the sample and hold unit 137 into a plurality of bits of digital signals and provides the digital signal to the digital signal processor 141.
디지털신호처리부(141)는 우선, (1) 디지털변환부(139)로부터 수신한 디지털 신호를 기초로 중성선(11)을 따라 대지로 흐르는 영상 전류의 실효치를 계산하고 (2) 계산된 실효치의 크기가 기 설정된 범위 내에 (3) 기 설정된 시간 이상 연속하여 유지되는 경우에는 변압기(10) 측에 결상이 발생한 것으로 판단한다.The digital signal processor 141 first calculates an effective value of the image current flowing along the neutral line 11 to the ground based on the digital signal received from the digital converter 139, and (2) the calculated magnitude of the effective value. (3) If it is continuously maintained within a preset range for more than a predetermined time, it is determined that an imaging has occurred on the transformer 10 side.
이 경우, 디지털신호처리부(141)는 주제어실의 주제어기(30)로 알람신호를 전송함으로써, 주제어기(30)로 하여금 변압기 연결 선로의 결상 상태를 관리자에게 알리도록 한다. 이와 함께, 디지털신호처리부(141)는 변압기(10) 2차 측의 차단기(미도시)로 트립신호(Trip Signal)를 제공하여 차단기가 오픈(Open)되도록 제어할 수 있다.In this case, the digital signal processing unit 141 transmits an alarm signal to the main controller 30 of the main control room, thereby causing the main controller 30 to inform the manager of an open phase of the transformer connection line. In addition, the digital signal processor 141 may control the breaker to be open by providing a trip signal to a breaker (not shown) on the secondary side of the transformer 10.
이하에서는 도 2를 참조하여, 본 발명의 결상 검출장치(100)의 동작을 설명한다.Hereinafter, the operation of the phase detection apparatus 100 of the present invention will be described with reference to FIG. 2.
<영상 전류 검출하여 디지털 신호로 변환: S201, S203><Image current detection and conversion to digital signal: S201, S203>
원자력 발전소 내의 변압기(10)의 1차 측 Y 결선의 중성선(11)을 통해 대지로 흐르는 영상분 전류가 존재하는 경우, 입력부(131)는, 그 중성선(11)에 설치된 영상 변류기(110)가 검출한 영상분 전류 신호를 입력받는다(S201).If there is an image current flowing through the neutral line 11 of the primary Y connection of the transformer 10 in the nuclear power plant to the ground, the input unit 131 is configured such that the image current transformer 110 installed in the neutral line 11 The detected image fraction current signal is received (S201).
입력부(131)로 입력된 아날로그 영상 신호는 이득조정부(133)에서 기 설정된 증폭율로 증폭된 다음 저역통과필터부(135)를 통과하면서 잡음이 제거되고 원하는 영상 전류분 만을 필터링한다. 저역통과필터부(135)에서 필터링된 아날로그 신호는 샘플앤홀드부(137)와 디지털변환부(139)를 거쳐 디지털 신호로 변환된다.The analog image signal input to the input unit 131 is amplified by the gain adjusting unit 133 at a preset amplification factor, and then passed through the low pass filter unit 135 to remove noise and filter only the desired image current. The analog signal filtered by the low pass filter 135 is converted into a digital signal through the sample and hold unit 137 and the digital converter 139.
<영상 전류 실효치 계산: S205><Image current RMS calculation: S205>
디지털신호처리부(141)는 디지털변환부(139)에서 제공된 신호를 처리하여 원자력 발전소 변압기 연결 선로에 결상이 발생하였는지 여부를 검출한다.The digital signal processing unit 141 processes the signal provided by the digital conversion unit 139 to detect whether or not an imaging occurs in the nuclear power plant transformer connection line.
이를 위해, 우선 디지털변환부(139)로부터 수신한 디지털 신호를 이용하여 영상 전류의 실효치를 계산한다.To this end, first, the effective value of the image current is calculated using the digital signal received from the digital converter 139.
<결상 여부 판단: S207, S209><Judged for open phase: S207, S209>
다음으로, 디지털신호처리부(141)는 (1) 계산된 실효치의 크기가 기설정된 범위 내에 (2) 기 설정된 시간 이상 연속하여 유지되는지 판단한다(S207).Next, the digital signal processor 141 determines whether (1) the magnitude of the calculated effective value is continuously maintained within the preset range (2) for a predetermined time or more (S207).
만약, 영상 전류의 실효치가 기 설정된 크기 범위 내에 기 설정된 시간 이상 연속하여 유지되는 경우, 디지털신호처리부(141)는 변압기(10) 측에 결상이 발생한 것으로 판단한다(S209).If the effective value of the image current is continuously maintained for a predetermined time or more within a predetermined size range, the digital signal processor 141 determines that an imaging has occurred on the transformer 10 side (S209).
만약, 영상 전류의 실효치가 기 설정된 크기 범위 내에 있지않거나, 실효치가 기 설정된 크기 범위 내에 있더라도 기 설정된 시간 이상 연속하여 유지되지 않는 경우에는 해당 영상 전류가 변압기(10) 측의 결상에 의한 것이 아니라고 판단하고 다시 S201 단계로 돌아간다.If the effective value of the image current is not within the preset size range or if the effective value is not continuously maintained for more than the preset time even if the effective value is within the preset size range, it is determined that the corresponding image current is not due to an open phase on the transformer 10 side. And the process returns to step S201 again.
<경보 제공 등: S211><Alarm provision: S211>
S207, S209 단계에서 변압기(10) 측에 결상이 발생한 것으로 판단되면, 디지털신호처리부(141)는 주제어실의 주제어기(30)로 알람신호를 전송함으로써 주제어기(30)로 하여금 변압기 연결 선로의 결상 상태를 관리자에게 알리도록 한다. 이와 함께, 디지털신호처리부(141)는 변압기(10) 2차 측의 차단기(미도시)로 트립신호(Trip Signal)를 제공하여 차단기가 오픈(Open)되도록 제어할 수 있다.When it is determined that an image has occurred in the transformer 10 at steps S207 and S209, the digital signal processing unit 141 transmits an alarm signal to the main controller 30 of the main control room, thereby causing the main controller 30 of the transformer connection line. Inform the manager of the missing phase. In addition, the digital signal processor 141 may control the breaker to be open by providing a trip signal to a breaker (not shown) on the secondary side of the transformer 10.
이상의 방법으로 본 발명의 결상 검출장치(100)의 동작이 수행된다.In the above manner, the operation of the phase detection apparatus 100 of the present invention is performed.
이상에서는 본 발명의 바람직한 실시 예에 대하여 도시하고 설명하였지만, 본 발명은 상술한 특정의 실시 예에 한정되지 아니하며, 청구범위에서 청구하는 본 발명의 요지를 벗어남이 없이 당해 발명이 속하는 기술 분야에서 통상의 지식을 가진 자에 의해 다양한 변형실시가 가능한 것은 물론이고, 이러한 변형실시들은 본 발명의 기술적 사상이나 전망으로부터 개별적으로 이해되어서는 안 될 것이다.Although the above has been illustrated and described with respect to preferred embodiments of the present invention, the present invention is not limited to the above-described specific embodiments, it is usually in the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.
본 발명은 영상 변류기를 이용하여 원자력발전소 내 변압기 연결 선로 상의 결상을 검출하는 결상 검출장치 및 그 결상 검출방법에 적용될 수 있다.The present invention can be applied to a phase detection device for detecting phase loss on a transformer connection line in a nuclear power plant using an image current transformer and a phase detection method thereof.

Claims (4)

  1. 원자력 발전소에 사용되는 변압기의 1차 측 Y 결선의 중성선에 설치된 영상변류기; 및An image transformer installed on the neutral line of the Y connection of the primary side of a transformer used in a nuclear power plant; And
    상기 영상 변류기에 유도된 영상 전류의 실효치가 기 설정된 기준값 이상으로 기 설정된 기준 시간 이상 유지되는 경우에, 상기 변압기 측에 결상이 발생한 것으로 판단하는 결상검출부를 포함하는 것을 특징으로 하는 원자력발전소 변압기 연결 선로 결상 검출장치.And a phase detection unit for determining that phase loss has occurred in the transformer side when the effective value of the image current induced in the image current transformer is maintained for a predetermined reference time or more. Phase detection device.
  2. 제1항에 있어서,The method of claim 1,
    상기 결상검출부는,The imaging detection unit,
    상기 영상변류기로부터 상기 영상 전류 신호를 입력받는 입력부;An input unit configured to receive the image current signal from the image current transformer;
    상기 입력부가 제공하는 영상 신호를 기 설정된 이득으로 증폭하는 이득조정부;A gain adjusting unit for amplifying the video signal provided by the input unit with a preset gain;
    상기 이득조정부에서 증폭된 신호를 필터링하는 저역통과필터부;A low pass filter filtering the signal amplified by the gain adjusting unit;
    상기 저역통과필터부의 출력을 디지털 영상 신호로 변환하는 샘플앤홀드부와 디지털변환부; 및A sample and hold unit and a digital conversion unit converting the output of the low pass filter unit into a digital image signal; And
    상기 디지털변환부에서 출력되는 디지털 영상신호를 기초로 상기 실효치를 계산하고, 상기 계산된 실효치가 기 설정된 기준값 이상으로 기 설정된 기준 시간 이상 유지되는지 판단하는 디지털신호처리부를 포함하는 것을 특징으로 하는 원자력발전소 변압기 연결 선로 결상 검출장치.And a digital signal processor configured to calculate the effective value based on the digital image signal output from the digital converter and determine whether the calculated effective value is maintained over a preset reference time or more. Transformer connection line phase detection device.
  3. 제1항 또는 제2항에 있어서,The method according to claim 1 or 2,
    상기 결상검출부는 상기 변압기 측 결상이 있는 경우에 경보신호를 생성하여 주제어기에게 제공하여 관리자가 대처하도록 하거나 상기 변압기의 2차 측 차단기에게 트립(Trip) 신호를 제공하는 상기 차단기를 오픈(Open)시키는 것을 특징으로 하는 원자력발전소 변압기 연결 선로 결상 검출장치.The phase detection unit generates an alarm signal when there is phase loss on the transformer side and provides the main controller to respond to the administrator or to open the breaker that provides a trip signal to the secondary side breaker of the transformer. Phase change detection device for a nuclear power plant transformer connecting line, characterized in that.
  4. 원자력발전소 변압기 연결 선로 결상 검출장치의 결상 검출방법에 있어서,In the phase detection method of the phase connection detection device of a transformer connection line of a nuclear power plant,
    상기 변압기의 1차 측 Y 결선의 중성선에 영상 변류기를 설치하고, 입력부가 상기 영상 변류기에 유도된 영상 전류를 입력받는 단계;Installing an image current transformer on a neutral line of the Y-connection of the primary side of the transformer, and receiving an image current induced by the input unit in the image current transformer;
    상기 입력부가 제공하는 영상 신호를 기 설정된 이득으로 증폭하는 단계;Amplifying the video signal provided by the input unit with a preset gain;
    상기 증폭된 신호를 저역통과 필터링하는 단계;Lowpass filtering the amplified signal;
    상기 저역통과 필터링된 아날로그 신호를 디지털 영상 신호로 변환하는 단계; 및Converting the lowpass filtered analog signal into a digital video signal; And
    상기 디지털 영상신호를 기초로 상기 실효치를 계산하고, 상기 계산된 실효치가 기 설정된 기준값 이상으로 기 설정된 기준 시간 이상 유지되는 경우에 상기 변압기 측에 결상이 발생한 것으로 판단하는 단계를 포함하는 것을 특징으로 하는 원자력발전소 변압기 연결 선로 결상 검출장치의 결상 검출방법.And calculating the effective value based on the digital image signal, and determining that an imaging occurs on the transformer side when the calculated effective value is maintained for a predetermined reference time or longer. A phase detection method of a phase connection detection device for a transformer connection line in a nuclear power plant.
PCT/KR2014/008147 2013-10-10 2014-09-01 Device for detecting open phase of connection line of nuclear power plant and open phase detecting method therefor WO2015053479A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100477886B1 (en) * 2002-05-27 2005-03-17 엘지전선 주식회사 Over current relay using zero-sequence current of ground wire
KR100817890B1 (en) * 2006-08-16 2008-03-31 김보경 Insulation monitoring system & Insulation detecting method for electric power supply system
KR200448842Y1 (en) * 2008-07-10 2010-05-26 박형민 Device for monitoring a zero-phasecurrent of transformer
JP2011133295A (en) * 2009-12-24 2011-07-07 Hitachi-Ge Nuclear Energy Ltd Method for detecting phase interruption of motor for driving reactor coolant recirculation pump

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100477886B1 (en) * 2002-05-27 2005-03-17 엘지전선 주식회사 Over current relay using zero-sequence current of ground wire
KR100817890B1 (en) * 2006-08-16 2008-03-31 김보경 Insulation monitoring system & Insulation detecting method for electric power supply system
KR200448842Y1 (en) * 2008-07-10 2010-05-26 박형민 Device for monitoring a zero-phasecurrent of transformer
JP2011133295A (en) * 2009-12-24 2011-07-07 Hitachi-Ge Nuclear Energy Ltd Method for detecting phase interruption of motor for driving reactor coolant recirculation pump

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