JPH01114332A - Protective device for power receiving substation facility - Google Patents
Protective device for power receiving substation facilityInfo
- Publication number
- JPH01114332A JPH01114332A JP62268173A JP26817387A JPH01114332A JP H01114332 A JPH01114332 A JP H01114332A JP 62268173 A JP62268173 A JP 62268173A JP 26817387 A JP26817387 A JP 26817387A JP H01114332 A JPH01114332 A JP H01114332A
- Authority
- JP
- Japan
- Prior art keywords
- power
- transformer
- company
- breaker
- circuit breaker
- 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
Links
- 230000001681 protective effect Effects 0.000 title description 2
- 238000001514 detection method Methods 0.000 claims abstract 2
- 230000005540 biological transmission Effects 0.000 abstract description 8
- 230000005284 excitation Effects 0.000 abstract description 5
- 230000001131 transforming effect Effects 0.000 description 4
- 230000007257 malfunction Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、コージェネレーション用の受変電設備の保護
装置に係り、電力会社電源と自家発電機電源を並列運転
時に、電力会社側で不具合が発生した場合の保護装置の
改良に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a protection device for power receiving and substation equipment for cogeneration, and the present invention relates to a protection device for power receiving and transforming equipment for cogeneration. Concerning improvements to protective devices in the event of such occurrence.
近年、コージェネレーションは、ガスタービン・ガスエ
ンジン等により発電を行なう一方、その排熱を利用して
給湯などの熱供給を行なうシステムで、省エネルギーシ
ステムとしての適用が拡大される一方、中太規模ビルに
おいても採用されてきている。コージェネレーションは
、設備の効率的利用から、非常用発電機とは異なり常時
使用される。したがって、コージェネレーションでは、
自家発電機電源は、常時共通母線を通して、電力会社電
源と並列運転されている。In recent years, cogeneration is a system that generates electricity using gas turbines, gas engines, etc., and uses its exhaust heat to supply heat such as hot water supply.While its application as an energy-saving system has been expanded, it has become increasingly popular in medium- and large-sized buildings. It has also been adopted in Cogeneration is used constantly, unlike emergency generators, due to its efficient use of equipment. Therefore, in cogeneration,
The private generator power supply is always operated in parallel with the power company power supply through a common bus.
電力会社電源と自家発電機電源の常時並列運転を考慮し
、電力会社系統における短絡事故の保護として方向短絡
継電器を、地絡事故の保護として地絡過電圧継電器を、
又停電時等に自家発電機電源より電力会社系統へ電力が
流出するのを防止するために逆電力継電器が必要とされ
ていた。また上記の継電器を設置するために受電点に三
次巻線付計器用変圧器（Ｇ Ｐ Ｔ）を設置する必要が
あった。尚、この種の装置としては実開昭６０−１６０
０５号公報を挙げることができる。Considering the constant parallel operation of electric power company power supply and private generator power supply, we installed directional short-circuit relays to protect against short-circuit accidents in electric power company grids, and earth-fault overvoltage relays to protect against ground fault accidents.
In addition, a reverse power relay is required to prevent power from flowing from the private generator power supply to the power company grid during a power outage. Additionally, in order to install the above-mentioned relay, it was necessary to install a potential transformer with a tertiary winding (GPT) at the power receiving point. In addition, this type of device was developed in 1986-160.
No. 05 can be mentioned.
上記従来技術は、価格の点が配慮されておらず。 The above conventional technology does not take into consideration the cost.
特にコジェネレーションを有しない一般変電所に、コジ
ェネレーション設備を追加する場合は、価格及び改造の
ための変電所停止期間が膨大となった。又電力会社系統
が、短絡・地絡等の事故ではない理由で、電力会社側の
遮断器が開放された場合、需要家側では電力会社系統の
停止が検出できず、自家発電機電源で電力会社系統を逆
加圧しつづけるという不具合が生じた。In particular, when adding cogeneration equipment to a general substation that does not have cogeneration, the cost and the period during which the substation is shut down for modification become enormous. In addition, if the power company's circuit breaker is opened due to a reason other than an accident such as a short circuit or ground fault, the customer cannot detect that the power company's system has stopped, and the power is supplied from the private generator. A problem occurred in which the company's system continued to be pressurized in reverse.
本発明の目的は、電力会社電源と自家発電機電源を並列
運転するコージェネレーション受変電設備において、安
価にして、しかも電力会社電源の停止検出をも検出でき
るコージェネレーション用変圧器２次側よりの逆励磁電
流でも動作可能な小勢力の電力方向継電器を設置し、そ
の継電器動作により変圧器１次又は２次側の遮断器をト
リップさせ、同時に、変圧器１次又は２次側に設けた過
電流継電器の動作・不動作により、電力会社系統の逆電
力送出・短絡事故発生と、逆電停止・地絡事故発生を区
別することにより、達成される。It is an object of the present invention to provide a cogeneration power receiving and substation equipment that operates electric power company power sources and private generator power sources in parallel, and to provide a system from the secondary side of a cogeneration transformer that is inexpensive and capable of detecting a stoppage of the electric power company power source. A power directional relay with a small force that can operate even with reverse excitation current is installed, and the operation of the relay trips the primary or secondary side circuit breaker of the transformer, and at the same time, the circuit breaker on the primary or secondary side of the transformer is tripped. This is achieved by distinguishing between reverse power transmission and short-circuit accidents in the power company system, and reverse power outages and ground faults, based on the operation and non-operation of current relays.
変圧器２次側に設けた小勢力の電力方向継電器は、電力
会社系統での短絡事故時、電力会社系統への逆電力送出
時に動作することはもちろん、電力会社系統の停電時に
も、変圧器の２次側よりの逆励磁を検出して動作するた
め、電力会社系統の不具合発生を確実に検出して、遮断
器を開放することにより、電力会社系統を自家発電系統
より、切り離すことができる。A small power directional relay installed on the secondary side of a transformer not only operates in the event of a short-circuit accident in the power company grid or when sending reverse power to the power company grid, but also in the event of a power outage in the power company grid. Since it operates by detecting reverse excitation from the secondary side of the power supply, it is possible to reliably detect the occurrence of a malfunction in the power company grid and open the circuit breaker, thereby disconnecting the power company grid from the private power generation system. .
以下に本発明の実施例を第１図に示すコジェネレーショ
ン用の受変電設備の保護装置の回路により説明する。Embodiments of the present invention will be described below with reference to a circuit of a protection device for power receiving and transforming equipment for cogeneration shown in FIG.
電力会社の配電用遮断器ＩＡより送電され、需要家設備
の受電用遮断器ＩＢにより受電し、主変圧器１０で負荷
に適当な電圧に降圧し、変圧器の２次側と接続した遮断
器ＩＣ，共通母線１４を経由して、き型用遮断器ＩＥに
より負荷に給電される。−右側の自家発電機１３の電源
は、自家発電機用遮断器ＬＤ、共通母線１４を経由して
、電力会社電源と並列運転で、き型用遮断器ＩＥにより
負荷に給電される。Power is transmitted from the distribution circuit breaker IA of the electric power company, received by the power receiving circuit breaker IB of the consumer equipment, stepped down to a voltage suitable for the load at the main transformer 10, and connected to the secondary side of the transformer. Power is supplied to the load via the IC and the common bus 14 by the circuit breaker IE. - The power source of the private generator 13 on the right side is supplied to the load by the circuit breaker IE via the private generator circuit breaker LD and the common bus 14 in parallel operation with the power company power supply.
上述の給電方式においては、電力会社電源と自家発電機
電源を並列運転しているために、電力会社の配電用遮断
器ＩＡと需要家の受電用遮断器１８間で短絡又は地絡事
故が発生した場合、電力会社側では、短絡事故の時は配
電用過電流継電器２Ａが動作し、配電用遮断器ＩＡをト
リップさせる。地絡事故の時は配電用地絡過電流継電器
３Ａが動作し配電用遮断器ＩＡをトリップさせる。いず
れの場合も事故点は電力会社電源より切り離されるが、
自家発電源より事故点に事故電流を供給しつづけるとい
う不具合が生じる。また事故以外でも電力会社ｆ１１ｇ
が停電した場合、自家発電機電源で電力会社系統を経由
して、他需要家に逆電力を送出するという不具合が生じ
るし、電力会社電源が停電ではなく、電力会社系統の保
守作業等の目的で、電力会社の配電用遮断器ＩＡを開放
した場合、自家発電機電源で変圧器１０を経由して、停
電させたはずの電力会社系統を逆加圧することになり、
非常に危険であり、最悪の場合は人身事故につながる恐
れがあるという不具合が生じる。In the above-mentioned power supply system, because the electric power company's power source and the private generator power source are operated in parallel, a short circuit or ground fault may occur between the electric power company's distribution circuit breaker IA and the consumer's power receiving circuit breaker 18. In this case, on the electric power company's side, the distribution overcurrent relay 2A operates in the event of a short circuit accident, tripping the distribution circuit breaker IA. In the event of a ground fault, the distribution ground fault overcurrent relay 3A operates to trip the distribution circuit breaker IA. In either case, the point of failure is isolated from the power company's power supply, but
A problem arises in that the private power source continues to supply fault current to the fault point. In addition, even in cases other than accidents, the power company f11g
If there is a power outage, there will be a problem in that the private generator power source will send reverse power to other customers via the power company system, and the power company power supply will not be a power outage but for the purpose of maintenance work etc. of the power company system. If the electric power company's distribution circuit breaker IA is opened, the electric power company's grid that was supposed to have been cut off will be reversely pressurized using the private generator power via the transformer 10.
This is extremely dangerous, and in the worst case, a malfunction occurs that may lead to personal injury.
上記の不具合を解消するために、本発明では、変圧器１
０の２次側の計器用変流器４Ｃと、共通母線１４に設置
している計器用変圧器１２とに接続された。小勢力の電
力方向継電器１１を設け、さらに、変圧器１０の１次側
の計器用変流器４Ｂに接続された。過電流継電器９を設
けた。過電流計電器９は、変圧器１０の２次側の計器用
変流器４Ｃに接続することも可能である。In order to eliminate the above-mentioned problems, in the present invention, the transformer 1
It was connected to the instrument current transformer 4C on the secondary side of 0 and the instrument transformer 12 installed on the common bus 14. A small force power directional relay 11 was provided and further connected to the instrument current transformer 4B on the primary side of the transformer 10. An overcurrent relay 9 was provided. The overcurrent meter 9 can also be connected to the measuring current transformer 4C on the secondary side of the transformer 10.
以下に本発明の詳細な説明する。電力会社の配電用遮断
器ＩＡを開放した場合、自家発電機電源で変圧器１０を
逆励磁して電力会社側の送電線を逆加圧する。この時変
圧器１０の２次側よりの逆励磁電流を小勢力の電力方向
継電器１１で検出し、受電用遮断器ＩＢをトリップさせ
る。これにより電力会社側の送電線の逆加圧を防止でき
る。トリップさせる遮断器は変圧器１０の２次側用遮断
器ＩＣでも良い。The present invention will be explained in detail below. When the electric power company's power distribution circuit breaker IA is opened, the transformer 10 is reverse excited by the private generator power supply to reverse pressurize the electric power company's power transmission line. At this time, the reverse excitation current from the secondary side of the transformer 10 is detected by the power direction relay 11 with a small force, and the power receiving circuit breaker IB is tripped. This prevents reverse pressure on the power company's power transmission lines. The circuit breaker to be tripped may be a circuit breaker IC for the secondary side of the transformer 10.
電力会社側の送電線で地絡事故が発生した場合は、電力
会社の配電用地絡過電流継電器３Ａが検出して、配電用
遮断器ＩＡをトリップさせる。この場合も上記と同様に
、小勢力の電力方向継電器１１で検出し、遮断器ＩＢ又
はＩＣをトリップさせれば良い。If a ground fault occurs in the power company's power transmission line, the power company's distribution ground fault overcurrent relay 3A will detect it and trip the distribution circuit breaker IA. In this case, similarly to the above, it is sufficient to detect it using the power directional relay 11 with a small force and trip the circuit breaker IB or IC.
一方電力会社側の送電線で短絡事故が発生した場合や、
他需要家に逆電力を送出した場合は、大電流が逆流する
。この場合も小勢力の電力方向継電器１１が動作して、
遮断器ＩＢ又はＩＣをトリップさせるとともに、過電流
継電器９が動作するので、逆流を防止できるとともに停
電による逆励磁トリップと区別できる。On the other hand, if a short circuit occurs on the power company's power line,
If reverse power is sent to other consumers, a large current will flow backwards. In this case as well, the power directional relay 11 with a small force operates,
Since the circuit breaker IB or IC is tripped and the overcurrent relay 9 is activated, reverse current can be prevented and can be distinguished from a reverse excitation trip caused by a power outage.
本発明によれば、第２図に示す従来例で必要としていた
、三次巻線付計器用変圧器５．地絡過電圧継電器６．方
向電力継電器７．逆電力継電器８が不要となり、安価と
なるばかりではなく、電力会社の停電も検出可能なコー
ジェネレーション受電保護装置を提供できる。According to the present invention, the voltage transformer 5 with a tertiary winding is required in the conventional example shown in FIG. Ground fault overvoltage relay6. Directional power relay7. Since the reverse power relay 8 is not required, it is possible to provide a cogeneration power receiving protection device that is not only inexpensive but also capable of detecting a power outage at the power company.
以上のように、本発明のコージェネレーション用の受変
電設備の保護装置によれば、安価にして。As described above, the protection device for power receiving and transforming equipment for cogeneration according to the present invention can be achieved at low cost.
電力会社系統の不具合を確実に検出し、電力会社系統を
自家発電系統より切り離すことができる設備とすること
ができる。It is possible to provide equipment that can reliably detect a malfunction in the power company system and disconnect the power company system from the private power generation system.
第１図は、本発明の実施例であるコージェネレーション
受変電保護装置の構成を示した系統図、第２図は、従来
のコージェネレーション受電保護装置の構成を示した系
統図である。
１・・・遮断器、２・・・過電流継電器、２・・・地絡
過電流継電器、４・・・計器用変流器、５・・・三次巻
線付計器用変圧器、６・・・地絡過電圧継電器、７・・
・有効電力方向継電器、８・・・無効電力方向継電器、
９・・・過電流継電器、１０・・・変圧器、１１・・・
電力方向継電器、１２・・・計器用変圧器、１３・・・
発電機、１４・・・母線。FIG. 1 is a system diagram showing the configuration of a cogeneration power receiving and transforming protection device according to an embodiment of the present invention, and FIG. 2 is a system diagram showing the configuration of a conventional cogeneration power receiving protection device. DESCRIPTION OF SYMBOLS 1... Breaker, 2... Overcurrent relay, 2... Earth fault overcurrent relay, 4... Instrument current transformer, 5... Instrument transformer with tertiary winding, 6...・Ground fault overvoltage relay, 7...
・Active power directional relay, 8...Reactive power directional relay,
9... Overcurrent relay, 10... Transformer, 11...
Power direction relay, 12... Instrument transformer, 13...
Generator, 14... Bus bar.
Claims (1)
よび受電用遮断器とを接続した配電線を、共通母線に接
続し、共通母線の他方側に自家発電機を接続した受変電
設備において、受電用遮断器と共通母線との間に計器用
変流器を、主変圧器の２次側と自家発電機との間に計器
用変圧器を、それぞれ接続し、これらの計器用変流器お
よび計器用変圧器で検出した検出信号によつて、受電用
遮断器をトリップする電力方向継電器を設けることを受
変電設備の保護装置。1. A power receiving substation in which the distribution line that connects the power supply side distribution circuit breaker, the power demand side main transformer, and the power receiving circuit breaker is connected to a common bus, and a private generator is connected to the other side of the common bus. In the equipment, an instrument current transformer is connected between the power receiving circuit breaker and the common bus, and an instrument transformer is connected between the secondary side of the main transformer and the private generator. A protection device for power receiving and substation equipment is to install a power direction relay that trips the power receiving circuit breaker based on the detection signal detected by the current transformer and potential transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62268173A JPH01114332A (en) | 1987-10-26 | 1987-10-26 | Protective device for power receiving substation facility |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62268173A JPH01114332A (en) | 1987-10-26 | 1987-10-26 | Protective device for power receiving substation facility |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01114332A true JPH01114332A (en) | 1989-05-08 |
Family
ID=17454927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62268173A Pending JPH01114332A (en) | 1987-10-26 | 1987-10-26 | Protective device for power receiving substation facility |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01114332A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03251057A (en) * | 1990-02-26 | 1991-11-08 | Fuji Electric Co Ltd | Independent operation transfer unit for power station facility |
| JPH04133627A (en) * | 1990-09-21 | 1992-05-07 | Matsushita Electric Ind Co Ltd | Simultaneous electrothermal feeder |
| JPH0641350U (en) * | 1992-05-20 | 1994-05-31 | 川崎重工業株式会社 | Power supply control device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50144051A (en) * | 1974-05-10 | 1975-11-19 | ||
| JPS57199429A (en) * | 1981-06-03 | 1982-12-07 | Tokyo Shibaura Electric Co | System separating device |
-
1987
- 1987-10-26 JP JP62268173A patent/JPH01114332A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50144051A (en) * | 1974-05-10 | 1975-11-19 | ||
| JPS57199429A (en) * | 1981-06-03 | 1982-12-07 | Tokyo Shibaura Electric Co | System separating device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03251057A (en) * | 1990-02-26 | 1991-11-08 | Fuji Electric Co Ltd | Independent operation transfer unit for power station facility |
| JPH04133627A (en) * | 1990-09-21 | 1992-05-07 | Matsushita Electric Ind Co Ltd | Simultaneous electrothermal feeder |
| JPH0641350U (en) * | 1992-05-20 | 1994-05-31 | 川崎重工業株式会社 | Power supply control device |
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