JPH0538041A - Detecting device for abnormality of differential relay - Google Patents
Detecting device for abnormality of differential relayInfo
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- JPH0538041A JPH0538041A JP3193206A JP19320691A JPH0538041A JP H0538041 A JPH0538041 A JP H0538041A JP 3193206 A JP3193206 A JP 3193206A JP 19320691 A JP19320691 A JP 19320691A JP H0538041 A JPH0538041 A JP H0538041A
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- Prior art keywords
- current detection
- detected
- current
- phase
- zero
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- Protection Of Transformers (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、変圧器の1次側および
2次側の電流をそれぞれ電流検出回路により検出し、検
出した1次側および2次側における電流の比または差に
基づいて保護対象機器の異常を検出し保護する差動継電
器の異常検出装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects the currents on the primary side and the secondary side of a transformer by a current detection circuit, and based on the ratio or difference of the detected currents on the primary side and the secondary side. The present invention relates to a differential relay abnormality detection device that detects and protects an abnormality of a protection target device.
【0002】[0002]
【従来の技術と発明が解決しようとする課題】差動継電
器ないし比率差動継電器(以下代表して「差動継電器」
という)は、変圧器の1次側、2次側をそれぞれ流れる
電流i1,i2 の比または差をとり、その比または差が一
定の範囲を超えている場合に、保護対象機器(例えば変
圧器)への電流の流入を遮断するものである。2. Description of the Related Art Differential relays or ratio differential relays (hereinafter referred to as "differential relays"
Means the ratio or difference of the currents i1 and i2 flowing respectively on the primary side and the secondary side of the transformer, and when the ratio or difference exceeds a certain range, the device to be protected (for example, the transformer). ) Is to block the flow of current to.
【0003】差動継電器には、変圧器の1次側、2次側
をそれぞれ流れる電流i1,i2 を検出する電流検出回路
が必要である。3相交流の場合の変圧器の1次側、2次
側をそれぞれ流れる各相電流の電流検出回路を図4に示
す。電源線Lに挿入される変圧器Tの1次側、2次側を
流れる電流は、それぞれ電流検出回路CT1,CT2 で検
出され、補助トランスACT1, ACT2を通して負荷
抵抗RA1, RB1, RC1, RA2, RB2, RC2の両端に電圧
VA1, VB1, VC1,VA2, VB2, VC2として検出され
る。The differential relay requires a current detection circuit for detecting the currents i1 and i2 flowing through the primary side and the secondary side of the transformer, respectively. FIG. 4 shows a current detection circuit for each phase current flowing through the primary side and the secondary side of the transformer in the case of three-phase alternating current. The currents flowing through the primary side and the secondary side of the transformer T inserted in the power supply line L are detected by the current detection circuits CT1 and CT2, respectively, and the load resistances RA1, RB1, RC1 and RA2, through the auxiliary transformers ACT1 and ACT2. Voltages VA1, VB1, VC1, VA2, VB2 and VC2 are detected across RB2 and RC2.
【0004】上記差動継電器において、保護対象機器以
外の故障、例えば差動継電器の電流検出回路CT1,CT
2 に断線、地絡等が発生しても差動継電器は動作する。
この場合でも、復旧は保護対象機器から行うことになる
ので、復旧時間の短縮はできない。本発明は、上記の問
題に鑑みてなされたものであって、差動継電器の電流検
出回路の断線、地絡を独自で検出することにより、故障
部位の特定を行い、復旧時間を短縮できる差動継電器の
異常検出装置を提供することを目的とする。In the above-mentioned differential relay, a fault other than the equipment to be protected, for example, the current detecting circuits CT1 and CT of the differential relay
Even if disconnection or ground fault occurs in 2, the differential relay operates.
Even in this case, since recovery is performed from the protection target device, the recovery time cannot be shortened. The present invention has been made in view of the above problems, and by independently detecting the disconnection and the ground fault of the current detection circuit of the differential relay, the failure portion can be identified and the recovery time can be shortened. An object of the present invention is to provide an abnormality detecting device for a relay.
【0005】[0005]
【課題を解決するための手段および作用】上記の目的を
達成するための本発明の差動継電器の異常検出装置は、
電流検出回路により検出される各相の電流を流す電流検
出負荷と、電流検出負荷の共通節点と大地との間に介在
された零相電流検出負荷と、零相電流検出負荷で検出さ
れた零相電流Io から絶対値|Io |を求め、しきい値
εと比較する第1の比較手段と、上記電流検出負荷によ
り検出された各相電流IA,IB,IC から絶対値|IA
|, |IB |, |IC |を求め、それぞれしきい値αA,
αB,αC と比較する第2の比較手段と、第1の比較手段
が|Io |>εであることを判定し、かつ、第2の比較
手段が|IA |<αA,|IB |<αB,または|IC |<
αC であることを判定した場合に電流検出回路の断線検
出信号を出力する断線検出手段とを備えるものである
(請求項1)。SUMMARY OF THE INVENTION An abnormality detecting device for a differential relay according to the present invention, which achieves the above object, comprises:
The current detection load that flows the current of each phase detected by the current detection circuit, the zero-phase current detection load interposed between the common node of the current detection load and the ground, and the zero detected by the zero-phase current detection load. Absolute value | Io | is obtained from phase current Io, first comparing means for comparing with threshold value ε, and absolute value | IA from each phase current IA, IB, IC detected by the current detection load.
│, │IB │, │IC │ are found and the thresholds αA,
The second comparing means for comparing with αB, αC and the first comparing means determine that | Io |> ε, and the second comparing means | IA | <αA, | IB | <αB , Or | IC | <
A disconnection detecting means for outputting a disconnection detection signal of the current detection circuit when it is determined to be α C is provided (claim 1).
【0006】上記の構成の異常検出装置によれば、電流
検出回路の断線時には|IA |, |IB |, |IC |の
いずれかが0となるので、それぞれしきい値αA,αB,α
C と比較することによって断線を検出することができ
る。なお、第1の比較手段で|Io |>εであることを
判定するようにしたのは、断線時で|Io |≒0の場合
には、変圧器にはもともと電流が流れていないので、そ
の場合にも異常信号出力を出すと電源の遮断と電流検出
回路の断線との区別がつかなくなるからである。According to the anomaly detecting apparatus having the above-mentioned structure, when the current detecting circuit is disconnected, one of | IA |, | IB |, and | IC | becomes 0, so that the threshold values αA, αB, α are respectively set.
The disconnection can be detected by comparing with C. The first comparison means determines that | Io |> ε is because when | Io | ≈0 at the time of disconnection, no current originally flows in the transformer. Even in that case, if the abnormal signal output is issued, it is impossible to distinguish between the interruption of the power supply and the disconnection of the current detection circuit.
【0007】また、本発明は、電流検出回路により検出
される各相の電流を流す電流検出負荷と、電流検出負荷
の共通節点と大地との間に介在された零相電流検出負荷
と、零相電流検出負荷で検出された零相電流Io から絶
対値|Io |を求め、しきい値εと比較する第1の比較
手段と、上記上記電流検出負荷により検出された各相電
流IA,IB,IC および上記零相電流Io を用いて|Io
+IA |, |Io +IB |, |Io +IC |を求め、そ
れぞれしきい値βA,βB,βC と比較する第3の比較手段
と、第1の比較手段が|Io |>εであることを判定
し、かつ、第3の比較手段が、|Io +IA |<βA,|
Io +IB |<βB,または|Io +IC |<βC である
ことを判定した場合、電流検出回路の地絡検出信号を出
力する地絡検出手段とを備えるものである。上記各電流
検出負荷、零相電流検出負荷は互いに等しいインピーダ
ンスである(請求項2)。Further, according to the present invention, a current detection load for flowing a current of each phase detected by the current detection circuit, a zero-phase current detection load interposed between a common node of the current detection load and the ground, and First comparing means for obtaining an absolute value | Io | from the zero-phase current Io detected by the phase current detection load and comparing it with the threshold value ε, and the phase currents IA and IB detected by the current detection load. , Ic and the zero-phase current Io described above | Io
+ IA │, │Io + IB │, │Io + IC │ is determined, and it is determined that the first comparison means is | Io │> ε, and the third comparison means compares the threshold values βA, βB, βC, respectively. And the third comparison means is | Io + IA | <βA, |
When it is determined that Io + IB | <βB or | Io + IC | <βC, a ground fault detection unit that outputs a ground fault detection signal of the current detection circuit is provided. The respective current detection loads and the zero-phase current detection loads have the same impedance (claim 2).
【0008】上記の構成の異常検出装置によれば、地絡
時には|Io +IA |, |Io +IB |, |Io +IC
|のいずれかが0となるので、それぞれしきい値βA,β
B,βC と比較することによって地絡を検出することがで
きる。A相が地絡した場合を例にとってさらに詳説する
と、地絡により、地絡点から大地に対して電流IA が流
れる外、電流検出負荷B, Cを通った電流IB,IC の分
流分の和According to the anomaly detecting apparatus having the above construction, in the case of a ground fault, | Io + IA |, | Io + IB |, | Io + IC
Since either of | becomes 0, the threshold values βA, β
The ground fault can be detected by comparing with B and βC. Taking the case where the A-phase is ground-faulted as an example, the current IA flows from the ground-fault point to the ground due to the ground fault, and the sum of the shunts of the currents IB and IC that have passed through the current detection loads B and C.
【0009】[0009]
【数1】
が電流検出負荷Aを通して地絡点から大地に流れる。係
数1/2は、電流検出負荷、零相電流検出負荷が互いに
等しいインピーダンスであるので等しく分流することに
基づく。符号−は、電流検出負荷Aにおいて、電流が通
常の場合とは反対に流れることを意味する。[Equation 1] Flows from the ground fault to the ground through the current detection load A. The coefficient ½ is based on the fact that the current detection load and the zero-phase current detection load have the same impedance, so that the current is divided equally. The sign − means that the current flows in the current detection load A opposite to the normal case.
【0010】一方零相電流検出負荷には、電流検出負荷
B, Cを通った電流IB,IC の残りの分流分の和On the other hand, the zero-phase current detection load is the sum of the remaining shunts of the currents IB and IC that have passed through the current detection loads B and C.
【0011】[0011]
【数2】
が流れる。したがって、電流検出負荷Aにより検出され
る電流と、零相電流検出負荷により検出される電流との
和|Io +IA |は、[Equation 2] Flows. Therefore, the sum of the current detected by the current detection load A and the current detected by the zero-phase current detection load | Io + IA |
【0012】[0012]
【数3】
となる。なお、第1の比較手段で|Io |>εであるこ
とを判定するようにしたのは、電源の遮断と電流検出回
路の地絡との区別がつくようにしたためである。[Equation 3] Becomes The reason why | Io |> ε is determined by the first comparing means is to distinguish between the interruption of the power supply and the ground fault of the current detection circuit.
【0013】[0013]
【実施例】以下実施例を示す添付図面によって詳細に説
明する。図1は、異常検出装置の全体の回路構成を示す
図であり、3相電源線Lを流れる電流iA,iB,iC は、
変圧器Tの1次側で電流検出回路CT1により検出さ
れ、2次側で電流検出回路CT2により検出される。以
下、変圧器Tの1次側で検出される電流値を処理する回
路11-1のみを説明するが、変圧器Tの2次側で電流検
出回路CT2により検出される電流値も同様な回路11
-2で処理されることを初めに断っておく。変圧器Tの1
次側、2次側を表す添字1, 2は以下省略する。Embodiments will be described in detail below with reference to the accompanying drawings showing embodiments. FIG. 1 is a diagram showing the entire circuit configuration of the abnormality detection device, in which the currents iA, iB, iC flowing through the three-phase power supply line L are
It is detected by the current detection circuit CT1 on the primary side of the transformer T and detected by the current detection circuit CT2 on the secondary side. Hereinafter, only the circuit 11-1 which processes the current value detected on the primary side of the transformer T will be described, but the current value detected by the current detection circuit CT2 on the secondary side of the transformer T is the same circuit. 11
First, let's decline that it is processed by -2. Transformer T 1
Subscripts 1 and 2 indicating the secondary side and the secondary side are omitted below.
【0014】補助トランスACTで検出された各相電流
IA,IB,IC 、および零相電流Io=IA+IB+IC は、負
荷抵抗RA,RB,RC,Ro の電圧VA,VB,VC,Vo として
検出される。電圧Vo は、絶対値回路4で絶対値|Vo
|をとられ、第1の比較器1においてしきい値εと比較
される。しきい値εは、3相交流回路の平衡状態からの
誤差分を見込んで設定される定数である。The phase currents IA, IB, IC and the zero-phase current Io = IA + IB + IC detected by the auxiliary transformer ACT are the voltage VA, VB, VC, Vo of the load resistances RA, RB, RC, Ro. Detected as. The voltage Vo is the absolute value | Vo in the absolute value circuit 4.
| And is compared with the threshold value ε in the first comparator 1. The threshold value ε is a constant set in consideration of an error amount from the equilibrium state of the three-phase AC circuit.
【0015】電圧VA,VB,VC は、絶対値回路5A,5B,
5C で絶対値|VA |, |VB |,|VC |をとられ、
第2の比較器2A,2B,2C においてしきい値αA,αB,α
C と比較される。しきい値αA,αB,αC は、断線検出の
ために設定される定数である。また、電圧VA,VB,VC
は、加算回路6A,6B,6C で電圧Vo とのベクトル和V
A +Vo,VB +Vo,VC +Vo がとられさらにそれらの
絶対値|VA +Vo |, |VB +Vo |, |VC +Vo
|がとられる。そして第3の比較器3A,3B,3C におい
てしきい値βA,βB,βC と比較される。しきい値βA,β
B,βC は、地絡検出のために設定される定数である。The voltages VA, VB, VC are absolute value circuits 5A, 5B,
Absolute values | VA |, | VB |, | VC |
The thresholds αA, αB, α in the second comparators 2A, 2B, 2C
Compared to C. The thresholds αA, αB and αC are constants set for detecting disconnection. In addition, the voltage VA, VB, VC
Is the vector sum V with the voltage Vo at the adder circuits 6A, 6B and 6C.
A + Vo, VB + Vo, VC + Vo are taken and their absolute values | VA + Vo |, | VB + Vo |, | VC + Vo
| Is taken. The third comparators 3A, 3B and 3C are compared with the threshold values βA, βB and βC. Threshold βA, β
B and βC are constants set for ground fault detection.
【0016】第2の比較器2A,2B,2C の出力は、OR
回路7に入り、OR回路7の出力は、第1の比較器1の
出力とともにAND回路9に入る。AND回路9の出力
は、断線信号として取り出される。第3の比較器3A,3
B,3C の出力は、OR回路8に入り、OR回路8の出力
は、第1の比較器1の出力とともにAND回路10に入
る。AND回路10の出力は地絡信号として取り出され
る。The outputs of the second comparators 2A, 2B and 2C are OR
Entering the circuit 7, the output of the OR circuit 7 enters the AND circuit 9 together with the output of the first comparator 1. The output of the AND circuit 9 is taken out as a disconnection signal. Third comparator 3A, 3
The outputs of B and 3C enter the OR circuit 8, and the output of the OR circuit 8 enters the AND circuit 10 together with the output of the first comparator 1. The output of the AND circuit 10 is taken out as a ground fault signal.
【0017】図2は、3相電源線Lを流れる電流iA,i
B,iC 、電流検出回路CTおよび補助トランスACTの
1次側を流れる電流IA,IB,IC,Io 、補助トランスA
CTの2次側を流れる電流 kIA, kIB, kIC, kIo 、
負荷抵抗RA,RB,RC,Ro の電圧VA,VB,VC,Vo をそ
れぞれ示す拡大回路図である。 kは補助トランスACT
の変成比で決まる定数である。電圧VA,VB,VC,Vo
は、それぞれ電流IA,IB,IC,Io に比例する。FIG. 2 shows a current iA, i flowing through the three-phase power supply line L.
B, iC, currents IA, IB, IC, Io flowing through the primary side of the current detection circuit CT and auxiliary transformer ACT, auxiliary transformer A
Currents flowing through the secondary side of CT kIA, kIB, kIC, kIo,
6 is an enlarged circuit diagram showing voltages VA, VB, VC, Vo of load resistances RA, RB, RC, Ro, respectively. k is an auxiliary transformer ACT
Is a constant determined by the metamorphic ratio of. Voltage VA, VB, VC, Vo
Are proportional to the currents IA, IB, IC and Io, respectively.
【0018】3相のうち1相が断線した場合、例えば図
2で×印で示したように、電流検出回路CTのA相コイ
ルが断線した場合、IA=0 となる。この時、負荷抵抗R
A で検出される電圧の絶対値|VA |も0となる。とこ
ろがIo には他の相の電流IB,IC の和IB+IC が流れ
るので、|V0 |は0とならない。したがって、第2の
比較器2Aの出力には信号が現れ、第1の比較器1の出
力にも信号が現れる。よって、AND回路9の出力から
信号が取り出されるので、電流検出回路CTが断線した
ことが判る。When one of the three phases is broken, for example, when the A-phase coil of the current detection circuit CT is broken, as shown by the mark X in FIG. 2, IA = 0. At this time, the load resistance R
The absolute value | VA | of the voltage detected at A also becomes zero. However, since the sum IB + IC of the currents IB and IC of the other phases flows through Io, | V0 | does not become zero. Therefore, a signal appears at the output of the second comparator 2A and a signal also appears at the output of the first comparator 1. Therefore, since the signal is taken out from the output of the AND circuit 9, it can be understood that the current detection circuit CT is disconnected.
【0019】3相のうち1相が地絡した場合を図3に示
す。例えばA相が地絡したとすると、地絡点Xから大地
には、電流IA と、補助トランスACTの1次側B相コ
イル、1次側C相コイルを流れる電流IB,IC のそれぞ
れ半分の和FIG. 3 shows the case where one of the three phases has a ground fault. For example, if the A-phase is ground-faulted, from the ground-fault point X to the ground, the current IA and half of the currents IB and IC flowing through the primary-side B-phase coil and the primary-side C-phase coil of the auxiliary transformer ACT, respectively. sum
【0020】[0020]
【数4】
が1次側A相コイルを通して流れ込む。この電流は、補
助トランスACTの2次側A相コイルで[Equation 4] Flows in through the primary-side A-phase coil. This current is the secondary side A phase coil of the auxiliary transformer ACT.
【0021】[0021]
【数5】
として検出される。一方、補助トランスACTの1次側
零相コイルには残りの半分[Equation 5] Detected as. On the other hand, the remaining half of the primary side zero-phase coil of the auxiliary transformer ACT
【0022】[0022]
【数6】
が流れる。この電流は、補助トランスACTの2次側零
相コイルで[Equation 6] Flows. This current is the secondary side zero-phase coil of the auxiliary transformer ACT.
【0023】[0023]
【数7】
として検出される。したがって、加算回路6A で求めら
れる|VA +Vo |は0となり、第3の比較器3A には
出力が現れる。一方、補助トランスACTの1次側零相
コイルには、前述したように[Equation 7] Detected as. Therefore, | VA + Vo | obtained by the adder circuit 6A becomes 0, and an output appears in the third comparator 3A. On the other hand, in the primary side zero phase coil of the auxiliary transformer ACT, as described above,
【0024】[0024]
【数8】
が流れるので、|V0 |は0とならず、第1の比較器1
の出力にも信号が現れる。よって、AND回路10の出
力から信号が取り出されるので、電流検出回路CTが地
絡したことが判る。[Equation 8] Since | V0 | does not become 0, the first comparator 1
A signal also appears at the output of. Therefore, since a signal is extracted from the output of the AND circuit 10, it can be seen that the current detection circuit CT has a ground fault.
【0025】[0025]
【発明の効果】以上のように、本発明の差動継電器の異
常検出装置(請求項1)によれば、電流検出負荷により
検出された各相電流IA,IB,ICから絶対値|IA |,
|IB|, |IC |を求め、それぞれしきい値αA,αB,
αC より小さいかどうか判別するようにしたので、差動
継電器の動作時に、電流検出回路の断線が原因であるか
どうかが判る。もし電流検出回路の断線であれば、保護
対象機器の点検をする手間が省けるので、復旧作業が短
時間で済むようになる。As described above, according to the abnormality detecting device for a differential relay of the present invention (claim 1), the absolute value | IA | from the phase currents IA, IB, IC detected by the current detection load. ,
│IB│, │IC │ is calculated, and thresholds αA, αB,
Since it is determined whether or not it is smaller than α C, it can be determined whether or not the disconnection of the current detection circuit is the cause when the differential relay operates. If the current detection circuit is broken, it is possible to save the labor of inspecting the protection target device, and the restoration work can be completed in a short time.
【0026】また、本発明の差動継電器の異常検出装置
(請求項2)によれば、上記各相電流IA,IB,IC およ
び零相電流Io を用いて、|Io +IA |, |Io +I
B |, |Io +IC |を求め、それぞれしきい値βA,β
B,βC より小さいかどうか判別するようにしたので、差
動継電器の動作時に、電流検出回路の地絡が原因である
かどうかが判る。もし電流検出回路の地絡であれば、保
護対象機器の点検をする手間が省けるので、復旧作業が
短時間で済むようになる。According to the abnormality detecting device for a differential relay of the present invention (claim 2), | Io + IA |, | Io + I is calculated by using the phase currents IA, IB, IC and the zero-phase current Io.
B |, | Io + IC |
Since it is determined whether or not it is smaller than B and βC, it can be determined whether the ground fault of the current detection circuit is the cause when the differential relay is operating. If there is a ground fault in the current detection circuit, it is possible to save the labor of inspecting the protection target device, and the restoration work can be completed in a short time.
【図1】異常検出装置の全体の回路構成を示す図であ
る。FIG. 1 is a diagram showing an overall circuit configuration of an abnormality detection device.
【図2】電流、電圧を示すための部分拡大図である。FIG. 2 is a partially enlarged view showing current and voltage.
【図3】1相地絡時の電流、電圧の関係を示す図であ
る。FIG. 3 is a diagram showing a relationship between current and voltage when there is a one-phase ground fault.
【図4】一般的な差動継電器の電流検出回路を示す回路
図である。FIG. 4 is a circuit diagram showing a current detection circuit of a general differential relay.
1 第1の比較器、 2A,2B,2C 第2の比較器、 3A,3B,3C 第3の比較器、 4 絶対値回路、 5A,5B,5C 絶対値回路、 6A,6B,6C 加算回路、 7, 8 OR回路、 9, 10 AND回路、 T 変圧器、 CT 電流検出回路、 RA,RB,RC 電流検出負荷、 Ro 零相電流検出負荷 1 first comparator, 2A, 2B, 2C second comparator, 3A, 3B, 3C third comparator, 4 absolute value circuit, 5A, 5B, 5C absolute value circuit, 6A, 6B, 6C adder circuit, 7, 8 OR circuit, 9, 10 AND circuit, T transformer, CT current detection circuit, RA, RB, RC current detection load, Ro Zero-phase current detection load
───────────────────────────────────────────────────── フロントページの続き (72)発明者 筏 達也 京都市右京区梅津高畝町47番地 日新電機 株式会社内 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Tatsuya Raft 47 Umezu Takaune Town, Ukyo-ku, Kyoto Nissin Electric Within the corporation
Claims (2)
ぞれ電流検出回路により検出し、検出された1次側およ
び2次側における各電流の比または差に基づいて、保護
対象機器の異常を検出し保護する差動継電器において、 電流検出回路により検出される各相の電流を流す電流検
出負荷と、 電流検出負荷の共通節点と大地との間に介在された零相
電流検出負荷と、 零相電流検出負荷で検出された零相電流Io から絶対値
|Io |を求め、しきい値εと比較する第1の比較手段
と、 上記電流検出負荷により検出された各相電流IA,IB,I
C から絶対値|IA |, |IB |, |IC |を求め、そ
れぞれしきい値αA,αB,αC と比較する第2の比較手段
と、 第1の比較手段が|Io |>εであることを判定し、か
つ、第2の比較手段が|IA |<αA,|IB |<αB ま
たは|IC |<αC であることを判定した場合に電流検
出回路の断線検出信号を出力する断線検出手段とを備え
ることを特徴とする差動継電器の異常検出装置。1. A device to be protected based on a current detection circuit detecting a current on a primary side and a current on a secondary side of a transformer, and based on a ratio or a difference between the detected currents on the primary side and the secondary side. In the differential relay that detects and protects the abnormalities of the current detection load, the current detection load that flows the current of each phase detected by the current detection circuit and the zero-phase current detection load that is interposed between the common node of the current detection load and the ground. And a first comparing means for obtaining an absolute value | Io | from the zero-phase current Io detected by the zero-phase current detection load and comparing the absolute value | Io | with the threshold value ε, and each phase current IA detected by the current detection load. , IB, I
Absolute values │IA │, │IB │, │IC │ are obtained from C, and the second comparison means for comparing with the threshold values αA, αB, αC and the first comparison means are | Io │> ε. Disconnection detection for outputting a disconnection detection signal of the current detection circuit when it is determined that the second comparison means is | IA | <αA, | IB | <αB or | IC | <αC. An abnormality detecting device for a differential relay, comprising:
ぞれ電流検出回路により検出し、検出された1次側およ
び2次側における各電流の比または差に基づいて、保護
対象機器の異常を検出し保護する差動継電器において、 電流検出回路により検出される各相の電流を流す電流検
出負荷と、 電流検出負荷の共通節点と大地との間に介在された零相
電流検出負荷と、 零相電流検出負荷で検出された零相電流Io から絶対値
|Io |を求め、しきい値εと比較する第1の比較手段
と、 上記電流検出負荷により検出された各相電流IA,IB,I
C および上記零相電流Io を用いて|Io +IA |, |
Io +IB |, |Io +IC |を求めそれぞれしきい値
βA,βB,βC と比較する第3の比較手段と、 第1の比較手段が|Io |>εであることを判定し、か
つ、第3の比較手段が|Io +IA |<βA,|Io +I
B |<βB または|Io +IC |<βC であることを判
定した場合、電流検出回路の地絡検出信号を出力する地
絡検出手段とを備え、 上記各電流検出負荷、零相電流検出負荷は互いにインピ
ーダンスが等しいことを特徴とする差動継電器の異常検
出装置。2. Protected equipment based on the ratio or difference between the detected currents on the primary side and the secondary side, respectively, detected by a current detection circuit. In the differential relay that detects and protects the abnormalities of the current detection load, the current detection load that flows the current of each phase detected by the current detection circuit and the zero-phase current detection load that is interposed between the common node of the current detection load and the ground. And a first comparing means for obtaining an absolute value | Io | from the zero-phase current Io detected by the zero-phase current detection load and comparing the absolute value | Io | with the threshold value ε, and each phase current IA detected by the current detection load. , IB, I
Using C and the zero-phase current Io, | Io + IA |, |
Io + IB |, | Io + IC | and third comparing means for comparing the threshold values βA, βB, βC respectively, and the first comparing means determines that | Io |> ε, and The comparison means of 3 is | Io + IA | <βA, | Io + I
When it is determined that B | <βB or | Io + IC | <βC, a ground fault detection unit that outputs a ground fault detection signal of the current detection circuit is provided, and each of the current detection load and the zero-phase current detection load is An abnormality detecting device for a differential relay, which is characterized by having the same impedance.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP03193206A JP3143498B2 (en) | 1991-08-01 | 1991-08-01 | Abnormality detection device in differential relay |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP03193206A JP3143498B2 (en) | 1991-08-01 | 1991-08-01 | Abnormality detection device in differential relay |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0538041A true JPH0538041A (en) | 1993-02-12 |
JP3143498B2 JP3143498B2 (en) | 2001-03-07 |
Family
ID=16304068
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP03193206A Expired - Fee Related JP3143498B2 (en) | 1991-08-01 | 1991-08-01 | Abnormality detection device in differential relay |
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JP (1) | JP3143498B2 (en) |
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