JPH0613349U - Neutral point grounding device - Google Patents
Neutral point grounding deviceInfo
- Publication number
- JPH0613349U JPH0613349U JP5022392U JP5022392U JPH0613349U JP H0613349 U JPH0613349 U JP H0613349U JP 5022392 U JP5022392 U JP 5022392U JP 5022392 U JP5022392 U JP 5022392U JP H0613349 U JPH0613349 U JP H0613349U
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- grounding
- neutral point
- high resistance
- ground
- 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.)
- Withdrawn
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Abstract
(57)【要約】
【目的】高電圧に耐える必要がある部品の数を少なくし
て中性点接地装置のコストを引き下げる。
【構成】高抵抗の接地抵抗器２０と低抵抗の接地抵抗器
２５とを設けて、両接地抵抗器２０及び２５の一端を接
地する。低抵抗の接地抵抗器２５の他端を遮断器３０を
介して高抵抗の接地抵抗器２０の非接地側端子に接続す
る。
(57) [Summary] [Purpose] To reduce the cost of neutral point grounding equipment by reducing the number of parts that need to withstand high voltage. [Structure] A high resistance ground resistor 20 and a low resistance ground resistor 25 are provided, and one ends of both ground resistors 20 and 25 are grounded. The other end of the low resistance grounding resistor 25 is connected to the non-grounded side terminal of the high resistance grounding resistor 20 via the circuit breaker 30.
Description
【０００１】[0001]
本考案は、送電系統において中性点を接地するために用いられる中性点接地装 置に関するものである。 The present invention relates to a neutral point grounding device used for grounding a neutral point in a power transmission system.
【０００２】[0002]
送電系統において、地絡故障時における異常電圧の発生を抑制するため、また 保護継電装置を確実に動作させるために、系統の中性点をリアクトルや抵抗器を 通して接地する中性点接地装置が用いられている。 In the power transmission system, the neutral point is grounded through a reactor or a resistor in order to suppress the generation of abnormal voltage in the event of a ground fault and to operate the protective relay reliably. The device is being used.
【０００３】 図２は従来用いられているガス絶縁中性点接地装置を示したもので、同図にお いて１は、抵抗値が高い抵抗器２をＳＦ6 ガスが封入された容器３内に収納して 、抵抗器２の両端につながる端子４及び５を容器３の上部に取付けた高抵抗の接 地抵抗器、６は、抵抗値が低い抵抗器７をＳＦ6 ガスが封入された容器８内に収 納して、抵抗器７の一端及び他端にそれぞれにつながる端子９及び１０を容器８ の上部及び下部側面にそれぞれ取付けた低抵抗の接地抵抗器である。FIG. 2 shows a conventionally used gas-insulated neutral point grounding device. In FIG. 2, 1 is a resistor 2 having a high resistance value inside a container 3 in which SF 6 gas is sealed. It is accommodated in the high resistance of the grounding resistors attached to the top of the terminal 4 and 5 leads to both ends of the resistor 2 container 3, 6, the low resistance resistor 7 SF 6 gas is sealed It is a low resistance grounding resistor in which terminals 9 and 10 housed in the container 8 and connected to one end and the other end of the resistor 7 are attached to the upper and lower side surfaces of the container 8, respectively.
【０００４】 高抵抗の接地抵抗器１の端子４は図示しない変圧器の中性点に接続され、端子 ５は低抵抗の接地抵抗器６の上部の端子９に接続されている。また低抵抗の接地 抵抗器６の下部の端子１０は接地され、高抵抗の接地抵抗器１の両端子４及び５ の間に遮断器１１が接続されている。更に、高抵抗の接地抵抗器１の端子４と図 示しない変圧器の中性点とを接続する導体に地絡電流を検出するための変流器１ ２が取付けられている。The terminal 4 of the high resistance grounding resistor 1 is connected to the neutral point of the transformer (not shown), and the terminal 5 is connected to the terminal 9 above the low resistance grounding resistor 6. The lower terminal 10 of the low resistance grounding resistor 6 is grounded, and a circuit breaker 11 is connected between both terminals 4 and 5 of the high resistance grounding resistor 1. Further, a current transformer 12 for detecting a ground fault current is attached to a conductor connecting a terminal 4 of the high resistance grounding resistor 1 and a neutral point of a transformer (not shown).
【０００５】 上記の中性点接地装置において、定常運転時には、遮断器１１が開いている。 従って定常時には高抵抗の接地抵抗器１と低抵抗の接地抵抗器６とが直列に接続 され、系統の中性点がこれらの抵抗器の直列回路を通して接地されている。系統 に地絡事故が発生すると図示のａ点の電位が上昇し、接地抵抗器１及び６を通し て地絡電流が流れる。変流器１２が地絡電流を検出すると遮断器１１が投入され 、高抵抗の接地抵抗器１が短絡される。このとき系統の中性点は低抵抗の接地抵 抗器６のみを通して接地される状態になり、地絡電流が増加するため、地絡継電 器を確実に動作させることができ、系統の保護を確実に図ることができる。In the neutral point grounding device, the circuit breaker 11 is open during steady operation. Therefore, in a steady state, the high resistance ground resistor 1 and the low resistance ground resistor 6 are connected in series, and the neutral point of the system is grounded through the series circuit of these resistors. When a ground fault occurs in the system, the potential at point a in the figure rises and a ground fault current flows through the ground resistors 1 and 6. When the current transformer 12 detects the ground fault current, the circuit breaker 11 is turned on and the high resistance grounding resistor 1 is short-circuited. At this time, the neutral point of the system is grounded only through the low-resistance grounding resistor 6, and the ground fault current increases, so that the ground fault relay can be operated reliably and the system protection. Can be ensured.
【０００６】[0006]
上記の中性点接地装置では、高抵抗の接地抵抗器１の両端子４及び５として高 電圧に耐えるものを用いる必要があるだけでなく、変流器１２も高電圧に耐える ものを用いる必要があるため、コストが高くなるという問題があった。 In the neutral point grounding device described above, it is necessary not only to use those capable of withstanding a high voltage as the terminals 4 and 5 of the grounding resistor 1 having a high resistance, but also to use the current transformer 12 capable of withstanding a high voltage. Therefore, there is a problem that the cost becomes high.
【０００７】 本考案の目的は、高電圧に耐える必要がある部品の数を減少させてコストの低 減を図った中性点接地装置を提供することにある。An object of the present invention is to provide a neutral point grounding device that reduces the number of parts that need to withstand a high voltage and reduces the cost.
【０００８】[0008]
本考案の中性点接地装置は、一端が接地された高抵抗の接地抵抗器と、一端が 接地され他端が高抵抗の接地抵抗器の非接地側端子に遮断器を介して接続された 低抵抗の接地抵抗器とにより構成される。 The neutral point grounding device of the present invention is connected to a non-grounded terminal of a high resistance grounding resistor whose one end is grounded and a grounding resistor whose one end is grounded and the other end is high resistance through a circuit breaker. It is composed of a low resistance grounding resistor.
【０００９】 地絡電流検出用の変流器は、上記高抵抗の接地抵抗器の接地回路に設けるのが 好ましい。The current transformer for detecting the ground fault current is preferably provided in the ground circuit of the high resistance ground resistor.
【００１０】[0010]
上記のように構成すると、定常時には遮断器を開いておくことにより中性点を 高抵抗を通して接地することができる。また地絡電流が検出されたときには、遮 断器を閉じることにより低抵抗の接地抵抗器を高抵抗の接地抵抗器に並列に接続 することができるため、中性点を低い抵抗を通して接地することができ、地絡継 電器の動作感度を高めることができる。 With the above configuration, the neutral point can be grounded through a high resistance by opening the circuit breaker in a steady state. Also, when a ground fault current is detected, a low resistance ground resistor can be connected in parallel with a high resistance ground resistor by closing the circuit breaker, so the neutral point should be grounded through a low resistance. The operation sensitivity of the ground fault relay can be increased.
【００１１】 また上記のように構成すると、高抵抗の接地抵抗器の接地側の端子は高電圧に 耐える必要がないので、高電圧に耐える必要がある部品の数を少なくしてコスト の低減を図ることができる。Further, with the above configuration, the ground-side terminal of the high-resistance ground resistor does not have to withstand high voltage, so the number of parts that need to withstand high voltage can be reduced and cost can be reduced. Can be planned.
【００１２】 更に、地絡電流検出用の変流器を高抵抗の接地抵抗器の接地回路に設けると、 該変流器としても耐圧が低いものを用いることができるため、よりいっそうのコ ストの低減を図ることができる。Further, when the current transformer for detecting the ground fault current is provided in the ground circuit of the high-resistance grounding resistor, the current transformer having a low withstand voltage can be used, so that the cost is further improved. Can be reduced.
【００１３】[0013]
図１は本考案の実施例を示したものである。同図において２０は高抵抗の接地 抵抗器で、この接地抵抗器２０は、抵抗値が高い抵抗器２１をＳＦ6 ガスが封入 された容器２２内に収納して、抵抗器２１の一端及び他端にそれぞれにつながる 端子２３及び２４を容器２２の下部側面及び上部にそれぞれ取付けた構造を有す る。また２５は低抵抗の接地抵抗器で、この接地抵抗器２５は、抵抗値が低い抵 抗器２６をＳＦ6 ガスが封入された容器２７内に収納して、抵抗器２６の一端及 び他端にそれぞれにつながる端子２８及び２９を容器２７の下部側面及び上部に それぞれ取付けた構造を有する。高抵抗の接地抵抗器２０の下部の端子２３及び 低抵抗の接地抵抗器２５の下部の端子２８は接地されている。FIG. 1 shows an embodiment of the present invention. In the figure, 20 is a high resistance grounding resistor, and this grounding resistor 20 has a resistor 21 having a high resistance value housed in a container 22 in which SF 6 gas is sealed, and one end of the resistor 21 and another It has a structure in which terminals 23 and 24 connected to the ends are attached to the lower side surface and the upper portion of the container 22, respectively. Further, reference numeral 25 is a low resistance grounding resistor. This grounding resistor 25 stores a resistor 26 having a low resistance value in a container 27 in which SF 6 gas is sealed, and one end of the resistor 26 and other It has a structure in which terminals 28 and 29 connected to the ends are attached to the lower side surface and the upper portion of the container 27, respectively. The lower terminal 23 of the high resistance ground resistor 20 and the lower terminal 28 of the low resistance ground resistor 25 are grounded.
【００１４】 高抵抗の接地抵抗器２０の上部の非接地側端子２４と低抵抗の接地抵抗器２５ の上部の非接地側端子２９との間に遮断器３０が接続され、高抵抗の接地抵抗器 ２０の接地回路に地絡電流検出用の変流器３１が取付けられている。高抵抗の接 地抵抗器２０の非接地側端子２４が図示しない変圧器の中性点に接続される。A circuit breaker 30 is connected between an upper non-grounding side terminal 24 of the high resistance grounding resistor 20 and an upper non-grounding side terminal 29 of the low resistance grounding resistor 25, and a high resistance grounding resistance. A current transformer 31 for detecting a ground fault current is attached to the ground circuit of the transformer 20. The non-grounded terminal 24 of the high resistance grounding resistor 20 is connected to the neutral point of the transformer (not shown).
【００１５】 上記の中性点接地装置をガス絶縁開閉装置に組み込む場合には、端子２９と遮 断器３０との間、遮断器３０と端子２４との間及び端子２４と図示しない変圧器 の中性点との間をそれぞれガス絶縁母線を通して接続する。この場合には、端子 ２３及び２８をガス管路内に導出することになるため、容器２１及び２７の上部 にそれぞれ絶縁スペーサを取付けて、該絶縁スペーサの貫通導体を端子２４また は２９とする。また端子２４及び２９を気中に導出する場合には、両端子として ブッシング端子を使用する。When the neutral point grounding device described above is incorporated into a gas insulated switchgear, a gap between the terminal 29 and the circuit breaker 30, a gap between the circuit breaker 30 and the terminal 24, and a gap between the terminal 24 and the transformer (not shown). The neutral points are connected to each other through gas-insulated buses. In this case, since the terminals 23 and 28 are led out into the gas pipeline, insulating spacers are attached to the upper portions of the containers 21 and 27, respectively, and the through conductors of the insulating spacers are used as the terminals 24 or 29. . When the terminals 24 and 29 are led out into the air, bushing terminals are used as both terminals.
【００１６】 上記の実施例において、定常運転時には遮断器３０が開いている。この状態で は、系統の中性点が高抵抗の接地抵抗器２０を通して接地される。系統に地絡事 故が生じ、変流器３１が地絡電流を検出すると、遮断器３０が投入される。これ により低抵抗の接地抵抗器２５が高抵抗の接地抵抗器２０に並列に接続されるた め、両抵抗器の合成抵抗値が低くなり、中性点の接地抵抗は等価的に低い値とな る。これにより地絡電流を増大させて、地絡継電器の動作感度を高め、系統の保 護を確実にすることができる。In the above-described embodiment, the circuit breaker 30 is open during steady operation. In this state, the neutral point of the system is grounded through the high resistance grounding resistor 20. When a ground fault occurs in the system and the current transformer 31 detects a ground fault current, the circuit breaker 30 is closed. As a result, the low resistance grounding resistor 25 is connected in parallel to the high resistance grounding resistor 20, so that the combined resistance value of both resistors becomes low, and the grounding resistance at the neutral point is equivalently low. Become. As a result, the ground fault current can be increased, the operating sensitivity of the ground fault relay can be increased, and the system protection can be ensured.
【００１７】[0017]
以上のように、本考案によれば、定常時には遮断器を開いておくことにより中 性点を高抵抗を通して接地することができ、また地絡電流が検出されたときには 、遮断器を閉じることにより低抵抗の接地抵抗器を高抵抗の接地抵抗器に並列に 接続して中性点を低い抵抗を通して接地することができ、地絡継電器の動作感度 を高めることができる。そして本考案においては、高抵抗の接地抵抗器の接地側 の端子が高電圧に耐える必要がないので、高電圧に耐える必要がある部品の数を 少なくしてコストの低減を図ることができる。 As described above, according to the present invention, the neutral point can be grounded through a high resistance by opening the circuit breaker during steady state, and the circuit breaker can be closed by detecting the ground fault current. A low resistance grounding resistor can be connected in parallel with a high resistance grounding resistor to ground the neutral point through a low resistance, thus increasing the operating sensitivity of the ground fault relay. Further, in the present invention, since the grounding side terminal of the high resistance grounding resistor does not have to withstand high voltage, it is possible to reduce the number of parts that need to withstand high voltage and reduce the cost.
【００１８】 また特に請求項２に記載した考案によれば、地絡電流検出用の変流器を高抵抗 の接地抵抗器の接地回路に設けたので、該変流器として耐圧が低いものを用いる ことができ、よりいっそうのコストの低減を図ることができる。Further, according to the invention described in claim 2, in particular, since the current transformer for detecting the ground fault current is provided in the ground circuit of the grounding resistor of high resistance, the current transformer having a low withstand voltage is selected. It can be used and the cost can be further reduced.
【図１】本考案の実施例の構成を示した接続図である。FIG. 1 is a connection diagram showing a configuration of an embodiment of the present invention.
【図２】従来の中性点接地装置の構成を示した接続図で
ある。FIG. 2 is a connection diagram showing a configuration of a conventional neutral point grounding device.
２０ 高抵抗の接地抵抗器 ２１ 抵抗器 ２２ 容器 ２３，２４ 端子 ２５ 低抵抗の接地抵抗器 ２６ 抵抗器 ２７ 容器 ２８，２９ 端子 ３０ 遮断器 20 High Resistance Grounding Resistor 21 Resistor 22 Container 23, 24 Terminal 25 Low Resistance Grounding Resistor 26 Resistor 27 Container 28, 29 Terminal 30 Circuit Breaker
Claims (2)
一端が接地され他端が前記高抵抗の接地抵抗器の非接地
側端子に遮断器を介して接続された低抵抗の接地抵抗器
とを備えてなる中性点接地装置。1. A high resistance grounding resistor having one end grounded,
A neutral point grounding device comprising: a low resistance grounding resistor, one end of which is grounded and the other end of which is connected to a non-grounding side terminal of the high resistance grounding resistor through a circuit breaker.
電流検出用の変流器が設けられている請求項１に記載の
中性点接地装置。2. The neutral point grounding device according to claim 1, wherein a current transformer for detecting a ground fault current is provided in a grounding circuit of the high resistance grounding resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5022392U JPH0613349U (en) | 1992-07-17 | 1992-07-17 | Neutral point grounding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5022392U JPH0613349U (en) | 1992-07-17 | 1992-07-17 | Neutral point grounding device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0613349U true JPH0613349U (en) | 1994-02-18 |
Family
ID=12853049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5022392U Withdrawn JPH0613349U (en) | 1992-07-17 | 1992-07-17 | Neutral point grounding device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0613349U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5582381U (en) * | 1978-11-29 | 1980-06-06 | ||
| JP2009543529A (en) * | 2006-07-06 | 2009-12-03 | コリア レイルロード リサーチ インスティテュート | Delta I ground fault protection relay system for DC traction power supply system and control method thereof |
-
1992
- 1992-07-17 JP JP5022392U patent/JPH0613349U/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5582381U (en) * | 1978-11-29 | 1980-06-06 | ||
| JP2009543529A (en) * | 2006-07-06 | 2009-12-03 | コリア レイルロード リサーチ インスティテュート | Delta I ground fault protection relay system for DC traction power supply system and control method thereof |
| JP4653238B2 (en) * | 2006-07-06 | 2011-03-16 | コリア レイルロード リサーチ インスティテュート | Delta I ground fault protection relay system for DC traction power supply system and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19961003 |