JPH08136591A - Harmonics overcurrent detector - Google Patents

Harmonics overcurrent detector

Info

Publication number
JPH08136591A
JPH08136591A JP6274890A JP27489094A JPH08136591A JP H08136591 A JPH08136591 A JP H08136591A JP 6274890 A JP6274890 A JP 6274890A JP 27489094 A JP27489094 A JP 27489094A JP H08136591 A JPH08136591 A JP H08136591A
Authority
JP
Japan
Prior art keywords
coil
metal body
temperature
current
harmonic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP6274890A
Other languages
Japanese (ja)
Inventor
Keiji Yamanaka
敬二 山中
Katsuhisa Yokoyama
勝久 横山
Kenji Morisada
健二 森貞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nichicon Corp
Original Assignee
Nichicon Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nichicon Corp filed Critical Nichicon Corp
Priority to JP6274890A priority Critical patent/JPH08136591A/en
Publication of JPH08136591A publication Critical patent/JPH08136591A/en
Pending legal-status Critical Current

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  • Measurement Of Current Or Voltage (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

PURPOSE: To obtain a harmonics overcurrent detector which is simple and low- cost by a method wherein a metal body is installed in the inside of a coil connected to the secondary side of a current transformer, a heat sensor is installed so as to come into contact with the metal body and a controller is operated in combination with the heat sensor. CONSTITUTION: A current which is obtained by a current transformer 4 is divided into a coil 51 and a variable shut resistor 54, and a metal body 52 which is installed in the inside of the coil 51 is induction-heated so as to raise a temperature. Since the magnitude of a rise in the temperature is increased nearly in proportion to the square and the frequency of a coil current, the temperature is hardly raised by fundamental waves and the rise in the temperature becomes large the larger a harmonics component is. In a bimetal for a heat sensor 53 which is installed so as to come into contact with the metal body 52, a contact is operated at a preset temperature, a controller 6 is operated, a warning is issued, a circuit breaker 3 is opened automatically, and a phase advance capacitor installation is protected from a harmonics trouble. In addition, the variable shunt resistor 54 adjusts the divided current of the coil so as to set a sensitivity.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、電力設備の高調波障害
対策に使用される高調波過電流検出器に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a harmonic overcurrent detector used as a countermeasure against harmonic interference in electric power equipment.

【０００２】[0002]

【従来の技術】最近、電力系統の電圧歪が増大し、特に
進相コンデンサ設備が高調波過電流によって障害を受
け、直列リアクトルの焼損や進相コンデンサが破壊する
事故が増加している。2. Description of the Related Art Recently, the voltage distortion of a power system has increased, and in particular, the phase-advancing capacitor equipment has been damaged by a harmonic overcurrent, and the number of accidents in which the series reactor is burned or the phase-advancing capacitor is destroyed is increasing.

【０００３】この対策としては従来の過電流継電器によ
る保護では不十分であり、高調波過電流継電器を用いた
り、直列リアクトルの温度上昇を検出するなどして保護
が行なわれている。As a countermeasure against this, conventional protection by an overcurrent relay is not sufficient, and protection is performed by using a harmonic overcurrent relay or detecting a temperature rise of a series reactor.

【０００４】[0004]

【発明が解決しようとする課題】従来から使用されてい
る高調波過電流継電器は、フィルタ回路を内蔵して各次
数の高調波電流を検出するか、マイクロプロセッサーを
内蔵してフーリエ解析を行なって各次数の高調波電流を
検出するなど、複雑な機構を有し部品点数も多くきわめ
て高価なものとなっている。Conventionally used harmonic overcurrent relays include a filter circuit to detect a harmonic current of each order, or a microprocessor to perform a Fourier analysis. It has a complicated mechanism such as detecting the harmonic current of each order and has a large number of parts, making it extremely expensive.

【０００５】また直列リアクトルの温度上昇を検出する
方法は、直列リアクトル自体の熱時定数が大きいため、
比較的短時間に過大高調波が流入するような場合では、
温度検出にタイムラグが生じて過電流継電器の作動が遅
れ、コンデンサ設備などの負荷機器が損傷することがし
ばしばあった。Further, the method of detecting the temperature rise of the series reactor is such that the thermal time constant of the series reactor itself is large.
When excessive harmonics flow in in a relatively short time,
A time lag occurred in temperature detection, the operation of the overcurrent relay was delayed, and load equipment such as capacitor equipment was often damaged.

【０００６】[0006]

【課題を解決するための手段】本発明は、金属の誘導加
熱による発熱量が周波数の依存性がきわめて大きく、周
波数が高くなると発熱量がほぼ周波数に比例して増大す
る原理を利用し、コイル内の金属体の温度を検知して高
調波電流の過電流を検出するものである。DISCLOSURE OF THE INVENTION The present invention utilizes the principle that the amount of heat generated by induction heating of metal has a very large frequency dependence, and that the amount of heat generated increases substantially in proportion to the frequency. The temperature of the metal body inside is detected to detect the overcurrent of the harmonic current.

【０００７】すなわち、 (1)変流器４と、高調波過電流検出部５と、制御回路６
とからなる高調波過電流検出器であって、高調波過電流
検出部５は、変流器４の２次側に並列接続するコイル５
１と、該コイルと並列接続した可変分流器５４と、上記
コイル５１の内部に設けた金属体５２と、該金属体に接
して設けた感熱センサー５３とから構成されている。That is, (1) current transformer 4, harmonic overcurrent detector 5, and control circuit 6
And a harmonic overcurrent detector 5 comprising a coil 5 connected in parallel to the secondary side of the current transformer 4.
1, a variable shunt 54 connected in parallel with the coil, a metal body 52 provided inside the coil 51, and a heat-sensitive sensor 53 provided in contact with the metal body.

【０００８】また、制御器６は、上記高調波過電流検出
部５の出力信号を受信して作動する制御回路を有する高
調波過電流検出器である。The controller 6 is a harmonic overcurrent detector having a control circuit which operates by receiving the output signal of the harmonic overcurrent detector 5.

【０００９】(2)コイル５１の内部に設けた金属体５２
が、磁性体である上記(1)に記載した高調波過電流検出
器である。(2) Metal body 52 provided inside the coil 51
Is the harmonic overcurrent detector described in (1) above, which is a magnetic material.

【００１０】(3)高調波過電流検出器５に設けた感温セ
ンサー５３が熱動接点（バイメタル）、または感温抵抗
体（サーミスタ）、または熱電対、あるいは電磁的感温
素子（サーマルフェライト感温素子）である上記(1)に
記載の高調波過電流検出器である。(3) The temperature sensor 53 provided in the harmonic overcurrent detector 5 is a thermodynamic contact (bimetal), a temperature sensing resistor (thermistor), a thermocouple, or an electromagnetic temperature sensing element (thermal ferrite). The harmonic overcurrent detector according to (1) above, which is a temperature sensitive element.

【００１１】[0011]

【作用】コイル５１の内部に設けた金属体５２におい
て、変流器４の出力電流はコイル５１と可変分流器５４
に分流し、コイル５１の内部に設けた金属体５２が渦電
流とヒステリシス損により誘導加熱され発熱温度上昇す
る。この発生熱量は大略コイル電流の２乗と周波数に比
例し、高調波電流の含有率が高い程発熱量は大となり、
温度上昇が大きくなる。In the metal body 52 provided inside the coil 51, the output current of the current transformer 4 is the coil 51 and the variable shunt 54.
And the metal body 52 provided inside the coil 51 is induction-heated by the eddy current and the hysteresis loss to raise the heat generation temperature. This generated heat amount is approximately proportional to the square of the coil current and the frequency, and the higher the content ratio of the harmonic current, the larger the heat generation amount.
The temperature rise becomes large.

【００１２】上記、金属体５２に接して設けられた感熱
センサー５３で上記温度を検出し、制御器６が制御信号
を出力する。The temperature sensor 53 provided in contact with the metal body 52 detects the temperature, and the controller 6 outputs a control signal.

【００１３】[0013]

【実施例１】本発明の一実施例を図１によって説明す
る。本実施例においては進相コンデンサ１と、直列リア
クトル２と、開閉器３と、変流器４とで構成された交流
電源に接続される負荷回路７であって、変流器４の２次
側に接続した高調波過電流検出部５と、制御器６とで装
置全体を構成している。[Embodiment 1] An embodiment of the present invention will be described with reference to FIG. In the present embodiment, a load circuit 7 connected to an AC power source composed of a phase advancing capacitor 1, a series reactor 2, a switch 3, and a current transformer 4, which is a secondary circuit of the current transformer 4. The harmonic overcurrent detection unit 5 connected to the side and the controller 6 constitute the entire apparatus.

【００１４】変流器４で得られる進相コンデンサ設備の
電流に相当する電流はコイル５１と可変分流器５４に分
流し、コイル５１の内部に設けた金属体５２（実施例で
は鉄）を誘導加熱し温度上昇させる。この温度上昇の大
きさは上記したように大略コイル電流の２乗と周波数に
比例して増大するので基本波では温度上昇しにくく、高
調波成分（含有量）が多い程温度上昇が大きくなる。A current corresponding to the current of the phase-advancing capacitor equipment obtained by the current transformer 4 is shunted to the coil 51 and the variable shunt 54 to induce a metal body 52 (iron in the embodiment) provided inside the coil 51. Heat to raise temperature. Since the magnitude of this temperature rise increases substantially in proportion to the square of the coil current and the frequency as described above, it is difficult for the fundamental wave to raise the temperature, and the higher the harmonic component (content), the greater the temperature rise.

【００１５】上記金属体５２に接して設けた感熱センサ
ー５３のバイメタルは、あらかじめ設定された温度で接
点が作動し、制御器６を作動させて警報を発するととも
に開閉器３を自動的に回路して進相コンデンサ設備を高
調波障害から保護することができる。可変分流器５４は
コイルの分流電流を調整して、感度設定を行うものであ
る。The bimetal of the heat-sensitive sensor 53 provided in contact with the metal body 52 has its contacts activated at a preset temperature to activate the controller 6 to issue an alarm and automatically switch the switch 3 to a circuit. The phase-advancing capacitor equipment can be protected from harmonic interference. The variable shunt 54 adjusts the shunt current of the coil to set the sensitivity.

【００１６】上記感熱センサー５３としてサーミスタま
たは熱電対を使用する場合は、制御器６において制御信
号を接点信号に変換する。また感熱センサー５３にサー
マルフェライト感温素子を使用した場合で、リードスイ
ッチ形である場合は上記バイメタル同様の使用方法が可
能である。When a thermistor or a thermocouple is used as the heat sensitive sensor 53, the controller 6 converts the control signal into a contact signal. Further, when a thermal ferrite temperature sensitive element is used for the heat sensitive sensor 53 and it is a reed switch type, the same usage method as the above bimetal can be used.

【００１７】上記感熱センサー５３がサーミスタまたは
熱電対形の場合、制御器６において周囲温度の変化を補
償することができ、また動作点の調整も可能となるの
で、可変分流器５４を省くことが可能であり、また可変
分流器の代りに固定分流器を設けることもできる。When the heat-sensitive sensor 53 is a thermistor or thermocouple type, the controller 6 can compensate for a change in ambient temperature and can adjust the operating point, so that the variable shunt 54 can be omitted. It is possible, and a fixed shunt can be provided instead of the variable shunt.

【００１８】[0018]

【発明の効果】本発明の高調波過電流検出器は、簡単で
安価に製造することができ、電子回路の様な複雑な機構
をもたないので故障もしにくく、かつ小形で配電盤への
取付スペースがきわめて少なくてすむなど多くの特徴を
有し、工業的ならびに実用的に価値大なるものがある。The harmonic overcurrent detector of the present invention can be manufactured easily and inexpensively, and since it does not have a complicated mechanism such as an electronic circuit, it does not easily break down and is compact and can be mounted on a switchboard. It has many features such as extremely small space, and is of great value industrially and practically.

【図面の簡単な説明】[Brief description of drawings]

【図１】図１は、本発明の高調波過電流検出器を進相コ
ンデンサ設備の高調波障害防止対策として用いた一実施
例の回路図である。FIG. 1 is a circuit diagram of an embodiment in which the harmonic overcurrent detector of the present invention is used as a harmonic interference prevention measure for a phase advancing capacitor facility.

【符号の説明】[Explanation of symbols]

１ 進相コンデンサ ２ 直列リアクトル ３ 開閉器 ４ 変流器 ５ 高調波過電流検出部 ６ 制御器 ７ 負荷回路 ５１ コイル ５２ 金属体 ５３ 感熱センサー ５４ 可変分流器 1 Phase-advancing capacitor 2 Series reactor 3 Switch 4 Current transformer 5 Harmonic overcurrent detector 6 Controller 7 Load circuit 51 Coil 52 Metal body 53 Thermal sensor 54 Variable shunt

───────────────────────────────────────────────────── フロントページの続き (72)発明者 森貞 健二 京都府京都市中京区御池通烏丸東入一筋目 仲保利町191番地の４ 上原ビル３階 ニ チコン株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Morisada Kenji Morisada, Kyoto Prefecture Kyoto Prefecture Oike Dori Karasuma Higashiiri 1st Line Nakabori-cho 4 Uehara Building 3F Nichicon Co., Ltd.

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 変流器(4)と、高調波過電流検出部(5)
と、制御器(6)とからなる高調波過電流検出器であっ
て、高調波過電流検出部(5)は、変流器(4)の２次側に並
列接続するコイル(51)と、該コイルと並列接続した可変
分流器(54)と、上記コイル(51)の内部に設けた金属体(5
2)と、該金属体に接して設けた感熱センサー(53)とから
構成され、制御器(6)は、上記高調波過電流検出部(5)の
出力信号を受信して作動する制御回路を有することを特
徴とする高調波過電流検出器。1. A current transformer (4) and a harmonic overcurrent detector (5)
And a controller (6), wherein the harmonic overcurrent detector (5) comprises a coil (51) connected in parallel to the secondary side of the current transformer (4). A variable shunt (54) connected in parallel with the coil, and a metal body (5) provided inside the coil (51).
2) and a thermal sensor (53) provided in contact with the metal body, and the controller (6) is a control circuit that operates by receiving the output signal of the harmonic overcurrent detection unit (5). A harmonic overcurrent detector having: 【請求項２】 コイル(51)の内部に設けた金属体(52)
が、磁性体であることを特徴とする請求項１記載の高調
波過電流検出器。2. A metal body (52) provided inside the coil (51).
Is a magnetic substance, The harmonic overcurrent detector according to claim 1, wherein 【請求項３】 高調波過電流検出部(5)に設けた感熱セ
ンサー(53)が熱動接点（バイメタル）、または感温抵抗
体（サーミスタ）、または熱電対、あるいは電磁気的感
温素子（サーマルフェライト感温素子）であることを特
徴とする請求項１記載の高調波過電流検出器。3. The thermosensitive sensor (53) provided in the harmonic overcurrent detection section (5) comprises a thermal contact (bimetal), a thermosensitive resistor (thermistor), a thermocouple, or an electromagnetic thermosensitive element ( The harmonic overcurrent detector according to claim 1, which is a thermal ferrite temperature sensitive element.
JP6274890A 1994-11-09 1994-11-09 Harmonics overcurrent detector Pending JPH08136591A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6274890A JPH08136591A (en) 1994-11-09 1994-11-09 Harmonics overcurrent detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6274890A JPH08136591A (en) 1994-11-09 1994-11-09 Harmonics overcurrent detector

Publications (1)

Publication Number Publication Date
JPH08136591A true JPH08136591A (en) 1996-05-31

Family

ID=17547964

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6274890A Pending JPH08136591A (en) 1994-11-09 1994-11-09 Harmonics overcurrent detector

Country Status (1)

Country Link
JP (1) JPH08136591A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6661680B2 (en) 2000-12-08 2003-12-09 Nec Corporation Higher harmonic suppressor element and DC power supply unit using the same
KR100728322B1 (en) * 2006-06-08 2007-06-13 조성완 Device for preventing overheating of very-low-frequency generator
KR101663816B1 (en) * 2016-06-03 2016-10-10 (주)테크윈시스템 Current transformer for wide bandwidth range

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6661680B2 (en) 2000-12-08 2003-12-09 Nec Corporation Higher harmonic suppressor element and DC power supply unit using the same
KR100728322B1 (en) * 2006-06-08 2007-06-13 조성완 Device for preventing overheating of very-low-frequency generator
KR101663816B1 (en) * 2016-06-03 2016-10-10 (주)테크윈시스템 Current transformer for wide bandwidth range

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