JP2010051120A - Hydraulic power-generator insulation recovery equipment - Google Patents
Hydraulic power-generator insulation recovery equipment Download PDFInfo
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Abstract
Description
本発明は、水力発電機絶縁回復装置に関し、特に、停止中の水力発電機（ダム水路式）の発電機界磁回路の絶縁を回復するのに好適な水力発電機絶縁回復装置に関する。 The present invention relates to a hydroelectric generator insulation recovery device, and more particularly, to a hydroelectric generator insulation recovery device suitable for recovering insulation of a generator field circuit of a hydroelectric generator (dam channel type) that is stopped.
従来、運転中の水力発電機の発電機界磁回路の絶縁が低下した場合には、水力発電機の界磁巻線の正極側と接地との間に接続された界磁地絡継電器（たとえば、下記の特許文献１参照）によって閉塞継電器を動作させることにより、水力発電機を停止させている。 Conventionally, when the insulation of the generator field circuit of the operating hydroelectric generator is lowered, the field ground fault relay (for example, connected between the positive side of the field winding of the hydroelectric generator and the ground) The hydroelectric generator is stopped by operating the closed relay according to Patent Document 1 below.
たとえば、図３に示すように第１および第２の水力発電機１1，１2（ダム水路式）のうち第１の水力発電機１1（先行機）のみを運転している場合には、同図に実線の矢印で示すように発電機励磁回路４から第１の水力発電機１1の第１の界磁巻線１a1に第１の励磁電流Ｉ1を供給している。また、停止中の第２の水力発電機１2（後行機）の第２の界磁巻線１a2には同図に波線の矢印で示すように発電機励磁回路４から第２の励磁電流Ｉ2を供給しないようにしている。
運転中の第１の水力発電機１1の発電機界磁回路の絶縁が低下した場合には、第１の界磁巻線１a1の正極側と接地との間に接続された第１の界磁地絡継電器５1に整定値以上の事故電流が入力されるため、第１の界磁地絡継電器５1が動作して第１の事故発生通知信号Ｓ1を第１の閉塞継電器６1に出力する。
第１の閉塞継電器６1は、第１の事故発生通知信号Ｓ1が第１の界磁地絡継電器５1から入力されると、第１の水力発電機１1を停止するように指示する第１の停止指示信号を発電機励磁回路４に出力するとともに、第１および第２の水力発電機１1，１2が備える第１および第２の水車（不図示）に水を流すための第１および第２の給水管に設けられた第１および第２の電磁弁７1，７2の開閉制御をするための電磁弁制御回路（不図示）に第１の停止指示信号を出力する。
第１の停止指示信号が第１の閉塞継電器６1から入力されると、発電機励磁回路４は第１の励磁電流Ｉ1の第１の界磁巻線１a1への供給を中止し、電磁弁制御回路は第１の電磁弁７1を閉じる。これにより、第１の水力発電機１1が停止する。
For example, as shown in FIG. 3, when only the first hydroelectric generator 1 1 (the preceding machine) is operating among the first and second hydroelectric generators 1 1 and 1 2 (dam waterway type) and it supplies the generator from the excitation circuit 4 to the first of the first field winding 1 a1 of hydroelectric generator 1 1 first excitation current I 1 as indicated by solid line arrow in FIG. The second field winding 1 a2 of the stopped second hydraulic power generator 1 2 (following machine) is supplied with a second excitation from the generator excitation circuit 4 as indicated by a wavy arrow in FIG. The current I 2 is not supplied.
If the insulation of the first generator field circuit of hydroelectric generator 1 1 in operation is lowered, first of which is connected between ground and the positive electrode side of the first field winding 1 a1 since the field ground絡継Electric 5 1 to setpoint or more fault current is input, the first accident notification signals S 1 and the first field ground絡継collector 5 1 operates first closed relay 6 Output to 1 .
First closure relay 61 is first accident notification signal S 1 is the input from the first field ground絡継Electric 5 1, an instruction to stop the first and hydroelectric generator 1 1 A first stop instruction signal is output to the generator excitation circuit 4 and water is supplied to the first and second water turbines (not shown) provided in the first and second hydraulic power generators 1 1 and 1 2 . A first stop instruction signal is output to an electromagnetic valve control circuit (not shown) for controlling opening and closing of the first and second electromagnetic valves 7 1 , 7 2 provided in the first and second water supply pipes. .
When the first instruction to stop signal is input from the first closed relay 61, generator excitation circuit 4 stops the supply to the first excitation current first field winding 1 a1 of I 1, solenoid valve control circuit closes the first solenoid valve 7 1. Thereby, the 1st hydroelectric generator 11 stops.
また、第１および第２の水力発電機１1，１2の運転に伴う発電機室内の高温化を防ぐために、図４（ａ）,（ｂ）に示すように第１および第２の水力発電機１1，１2に第１および第２の排気ダクト２1，２2をそれぞれ設置して、第１の水力発電機１1の運転中には第１の排気ダクト２1内に設けられた第１の排気ダンパー３1を図４（ａ）に白抜きで示すように開いて第１の水力発電機１1によって温められた空気を発電機室外に排気し、第２の水力発電機１2の運転中には第２の排気ダクト２2内に設けられた第２の排気ダンパー３2を図４（ｂ）に白抜きで示すように開いて第２の水力発電機１2によって温められた空気を発電機室外に排気している。 In order to prevent the high temperature of the generator chamber with the first and second hydroelectric generator 1 1, 1 2 in operation, FIG. 4 (a), the first and second hydraulic as shown in (b) First and second exhaust ducts 2 1 and 2 2 are installed in the generators 1 1 and 1 2 , respectively, and are provided in the first exhaust duct 2 1 during operation of the first hydroelectric generator 1 1. The first exhaust damper 3 1 thus opened is opened as shown in white in FIG. 4A, and the air heated by the first hydroelectric generator 1 1 is exhausted to the outside of the generator room to produce the second hydroelectric power generation. machine 1 in the second operation the second exhaust damper 3 2 to FIG. 4 (b) as shown by a hollow in the open second hydro-generator provided in the second exhaust duct 2 in the 2 1 2 The air heated by the air is exhausted outside the generator room.
なお、下記の特許文献２には、水車発電機の休止中に発電機風道の気密をより高めて発電機風道内を乾燥空気の雰囲気に保つために、上部保護カバー上の吸気口にそれぞれ吸気口閉止装置が設けられ、吸気口閉止装置が吸気口の開口部を塞ぐカバーと、枢軸として働くヒンジと、手で扱うための取っ手とからなり、水車発電機の休止中に各カバーを閉じてヒータで空気を加熱することにより発電機風道内を乾燥空気の雰囲気に保持するようにした水車発電機の吸湿防止装置が開示されている。
上述したように運転中の第１の水力発電機１1の発電機界磁回路の絶縁が低下した場合には第１の水力発電機１1を自動停止させることができるが、停止中の第２の水力発電機１2が発電機室内の湿度の上昇によって吸湿し発電機界磁回路の絶縁低下が生じた場合には、第２の水力発電機１2の第２の界磁巻線１a2には発電機励磁回路４から第２の励磁電流Ｉ2が供給されていないため、第２の界磁巻線１a2の正極側と接地との間に接続された第２の界磁地絡継電器５2は動作しない（図３参照）。
その結果、第２の水力発電機１2の運転開始時に第２の水力発電機１2の第２の界磁巻線１a2に発電機励磁回路４から第２の励磁電流Ｉ2を供給して始めて、上述した第１の界磁地絡継電器５1と同様にして第２の界磁地絡継電器５2が動作して第２の事故発生通知信号Ｓ2を第２の閉塞継電器６2に出力し、第２の閉塞継電器６2が第２の水力発電機１2を停止するように指示する第２の停止指示信号を発電機励磁回路４および電磁弁制御回路に出力する。
第２の停止指示信号が第２の閉塞継電器６2から入力されると、発電機励磁回路４は第２の励磁電流Ｉ2の第２の界磁巻線１a2への供給を中止し、電磁弁制御回路は第２の電磁弁７2を閉じる。これにより、第２の水力発電機１2が停止する。
また、このときに警報が発せられるので、作業員が現地に出向いて、第２の水力発電機１2の発電機界磁回路の絶縁を回復させるための乾燥運転（無負荷無励磁運転）を実施している。
Although the case where the insulating first hydroelectric generator 1 1 of the generator field circuit during operation as described above is lowered can be automatically stopped first a hydroelectric generator 1 1, the suspended when the hydroelectric generator 1 2 2 insulating lowering of moisture absorption and the generator field circuit is caused by an increase in the humidity of the generator chamber, a second field winding of the second hydroelectric generator 1 2 1 since the generator excitation circuit 4 to a2 second excitation current I 2 is not supplied, a second field ground connected between ground and the positive electrode side of the second field winding 1 a2絡継Electric 5 2 is not operated (see FIG. 3).
As a result, the second hydroelectric generator 1 from 2 of the second field winding 1 a2 generator excitation circuit 4 to the second supply exciting current I 2 during the second hydroelectric generator 1 2 start of operation starting, the first field ground絡継Electric 5 1 Similarly the second field ground絡継collectors 5 2 a second accident notification signal S 2 operating second closure relay 6 2 above output to the second closed relay 6 2 outputs to the generator excitation circuit 4 and the solenoid valve control circuit a second stop instruction signal for instructing to stop the second hydroelectric generator 1 2.
When the second stop instruction signal is input from the second closed relay 6 2, generator excitation circuit 4 stops the supply to the second excitation current second field winding 1 a2 of I 2, solenoid valve control circuit closes the second solenoid valve 7 2. Thus, the second hydroelectric generator 1 2 is stopped.
In addition, since an alarm is issued at this time, a worker goes to the site and performs a drying operation (no-load non-excitation operation) to restore insulation of the generator field circuit of the second hydroelectric generator 12. We are carrying out.
なお、停止中の第２の水力発電機１2の発電機界磁回路の絶縁低下を防止するために、図５に示すように第１の排気ダクト２1と第２の排気ダクト２2とを連通させて、運転中の第１の水力発電機１1によって温められた空気（高温で乾燥した空気）を第２の水力発電機１2に供給して第２の水力発電機１2を常に乾燥させておくことも考えられる。
しかし、この場合には、高温で乾燥した空気が発電機室内を循環して発電機室の室温が上昇するため、第１および第２の水力発電機１1，１2の軸受けの温度が上昇して第１および第２の水力発電機１1，１2の軸受けメタルが焼損したり第１および第２の水力発電機１1，１2の寿命が低下したりするおそれがあるという問題がある。
In order to prevent insulation reduction of the second hydroelectric generator 1 2 generator field circuit of stopped, a first exhaust duct 2 1 and the second exhaust duct 2 2 As shown in FIG. 5 , And the air heated by the first hydroelectric generator 1 1 in operation (air dried at a high temperature) is supplied to the second hydroelectric generator 1 2 to supply the second hydroelectric generator 1 2 . It is also possible to keep it dry at all times.
However, in this case, since the air dried at high temperature circulates in the generator chamber and the room temperature of the generator chamber rises, the temperature of the bearings of the first and second hydraulic power generators 1 1 and 1 2 rises. is a problem that to the first and second hydroelectric generator 1 1, 1 2 of the bearing metal is burnt or the first and second hydroelectric generator 1 1, 1 2 of life is likely to be lowered is there.
本発明の目的は、作業員が現地に出向いて乾燥運転を実施しなくても停止中の水力発電機の発電機界磁回路の絶縁を回復させることができる水力発電機絶縁回復装置を提供することにある。 An object of the present invention is to provide a hydroelectric generator insulation recovery device that can restore insulation of a generator field circuit of a hydroelectric generator that is stopped without an operator going to the site to perform a drying operation. There is.
本発明の水力発電機絶縁回復装置は、停止中の水力発電機（１2）の発電機界磁回路の絶縁低下が生じた際に該水力発電機の発電機界磁回路の絶縁を回復するための水力発電機絶縁回復装置であって、前記水力発電機の発電機界磁回路の絶縁低下を検出するための絶縁低下検出手段と、該絶縁低下検出手段によって前記水力発電機の発電機界磁回路の絶縁低下が検出されると、該水力発電機を所定の乾燥運転時間だけ乾燥運転させる乾燥運転手段とを具備することを特徴とする。
ここで、前記水力発電機が運転中であるときに該水力発電機の界磁巻線（１a2）に励磁電流（Ｉ2）を供給する発電機励磁手段（４’）をさらに具備し、前記絶縁低下検出手段が、前記水力発電機の前記界磁巻線に接続された界磁地絡継電器（５2）を備え、前記乾燥運転手段が、前記界磁地絡継電器によって停止中の前記水力発電機の発電機界磁回路の絶縁低下が検出されると、該水力発電機が備える水車に水を流すための給水管に設けられた電磁弁（７2）を前記乾燥運転時間だけ開くための電磁弁制御信号（ＶCON2）を発生する電磁弁制御信号発生手段（１１2，１２2）を備え、前記発電機励磁手段が、前記絶縁低下検出手段として機能して、前記水力発電機が停止中であるときにも該水力発電機の前記界磁巻線に前記励磁電流を供給するとともに、該水力発電機が停止中であるときに前記界磁地絡継電器によって該水力発電機の発電機界磁回路の絶縁低下が検出されると、前記乾燥運転手段として機能して、該水力発電機の該界磁巻線への該励磁電流の供給を前記乾燥運転時間だけ中止してもよい。
また、本発明の水力発電機絶縁回復装置は、第１および第２の水力発電機（１1，１2）のうち該第１の水力発電機が運転中であり該第２の水力発電機が停止中である場合に、該第２の水力発電機の発電機界磁回路の絶縁低下が生じた際に該第２の水力発電機の発電機界磁回路の絶縁を回復するための水力発電機絶縁回復装置であって、運転中の前記第１の水力発電機の第１の界磁巻線（１a1）に第１の励磁電流（Ｉ1）を供給するとともに停止中の前記第２の水力発電機の第２の界磁巻線（１a2）にも第２の励磁電流（Ｉ2）を供給する発電機励磁手段（４’）と、前記第１および第２の水力発電機の発電機界磁回路の絶縁低下を検出するための絶縁低下検出手段と、該絶縁低下検出手段によって前記第２の水力発電機の発電機界磁回路の絶縁低下が検出されると、該第２の水力発電機を所定の乾燥運転時間だけ乾燥運転させる乾燥運転手段と、前記絶縁低下検出手段によって前記第１の水力発電機の発電機界磁回路の絶縁低下が検出されると、該第１の水力発電機を緊急停止させる緊急停止手段とを具備することを特徴とする。
ここで、前記絶縁低下検出手段が、前記第１の水力発電機の前記第１の界磁巻線に接続された第１の界磁地絡継電器（５1）および前記第２の水力発電機の前記第２の界磁巻線に接続された第２の界磁地絡継電器（５2）を備え、前記乾燥運転手段が、前記第１の界磁地絡継電器によって前記第１の水力発電機の発電機界磁回路の絶縁低下が検出されても、該第１の水力発電機が備える第１の水車に水を流すための第１の給水管に設けられた第１の電磁弁（７1）を前記乾燥運転時間だけ開くための第１の電磁弁制御信号（ＶCON1）を発生しないが、前記第２の界磁地絡継電器によって前記第２の水力発電機の発電機界磁回路の絶縁低下が検出されると、該第２の水力発電機が備える第２の水車に水を流すための第２の給水管に設けられた第２の電磁弁（７2）を前記乾燥運転時間だけ開くための第２の電磁弁制御信号（ＶCON2）を発生する絶縁回復用電磁弁制御手段（１０）を備え、前記発電機励磁手段が、前記第１の界磁地絡継電器によって前記第１の水力発電機の発電機界磁回路の絶縁低下が検出されると、前記緊急停止手段として機能して、該第１の水力発電機の前記第１の界磁巻線への前記第１の励磁電流の供給を中止するとともに、前記第２の界磁地絡継電器によって前記第２の水力発電機の発電機界磁回路の絶縁低下が検出されると、前記乾燥運転手段として機能して、該第２の水力発電機の前記第２の界磁巻線への前記第２の励磁電流の供給を前記乾燥運転時間だけ中止してもよい。
The hydroelectric generator insulation recovery device of the present invention recovers the insulation of the generator field circuit of the hydroelectric generator (1 2 ) when the insulation reduction of the generator field circuit of the hydroelectric generator (1 2 ) is stopped. A hydroelectric generator insulation recovery device for detecting an insulation drop in a generator field circuit of the hydroelectric generator, and a generator field of the hydroelectric generator by the insulation drop detection means When a decrease in insulation of the magnetic circuit is detected, the hydroelectric generator is provided with a drying operation means for performing a drying operation for a predetermined drying operation time.
Here, generator excitation means (4 ′) for supplying excitation current (I 2 ) to the field winding (1 a2 ) of the hydroelectric generator when the hydroelectric generator is in operation is further provided, the insulating drop detecting means, said comprising a hydro-generator of the field winding connected to a field ground絡継Electric (5 2), the drying operation unit, said suspended by the field磁地絡継Appliances When a decrease in insulation of the generator field circuit of the hydroelectric generator is detected, the electromagnetic valve (7 2 ) provided in the water supply pipe for flowing water to the water wheel provided in the hydroelectric generator is opened for the drying operation time. Solenoid valve control signal generating means (11 2 , 12 2 ) for generating a solenoid valve control signal (V CON2 ) for the generator, and the generator excitation means functions as the insulation lowering detection means, The excitation current is supplied to the field winding of the hydroelectric generator even when the In addition, when a decrease in insulation of the generator field circuit of the hydroelectric generator is detected by the field ground fault relay when the hydroelectric generator is stopped, it functions as the drying operation means, The supply of the exciting current to the field winding of the hydroelectric generator may be stopped during the drying operation time.
The hydroelectric generator insulation recovery device of the present invention is the first hydroelectric generator (1 1 , 1 2 ) out of the first and second hydroelectric generators (1 1 , 1 2 ), and the second hydroelectric generator. When the insulation of the generator field circuit of the second hydraulic power generator is reduced, the hydraulic power for restoring the insulation of the generator field circuit of the second hydraulic power generator is reduced. A generator insulation recovery device for supplying a first exciting current (I 1 ) to a first field winding (1 a1 ) of the first hydroelectric generator in operation and stopping the first Generator excitation means (4 ′) for supplying a second excitation current (I 2 ) to the second field winding (1 a2 ) of the second hydroelectric generator, and the first and second hydraulic power generations Insulation lowering detecting means for detecting insulation lowering of the generator field circuit of the generator, and the generator field circuit of the second hydroelectric generator by the insulation lowering detecting means When an edge drop is detected, a drying operation means for drying the second hydroelectric generator for a predetermined drying operation time, and a generator field circuit of the first hydroelectric generator by the insulation lowering detection means. And an emergency stop means for stopping the first hydroelectric generator in an emergency when an insulation decrease is detected.
Here, the insulation lowering detection means includes a first field ground fault relay (5 1 ) connected to the first field winding of the first hydraulic power generator and the second hydraulic power generator. A second field ground fault relay (5 2 ) connected to the second field winding of the first field hydroelectric power generator by the first field ground fault relay. A first solenoid valve (1) provided in a first water supply pipe for flowing water to a first water turbine provided in the first hydraulic power generator even if a decrease in insulation of the generator field circuit of the machine is detected 7 1 ) does not generate a first solenoid valve control signal (V CON1 ) for opening the drying operation time, but the generator field of the second hydroelectric generator is generated by the second field ground fault relay. When a decrease in insulation of the circuit is detected, the second water pipe provided in the second water supply pipe for flowing water to the second water turbine provided in the second hydroelectric generator Of an electromagnetic valve (7 2) a second solenoid valve control signal for opening only the drying operation time (V CON2) solenoid valve control means for insulating recovery for generating (10), said generator excitation means, When the first field ground fault relay detects a decrease in insulation of the generator field circuit of the first hydroelectric generator, it functions as the emergency stop means, and the first hydroelectric generator The supply of the first exciting current to the first field winding is stopped, and the second field ground fault relay detects a decrease in insulation of the generator field circuit of the second hydroelectric generator. Then, it functions as the drying operation means, and the supply of the second exciting current to the second field winding of the second hydraulic power generator may be stopped for the drying operation time. .
本発明の水力発電機絶縁回復装置は、停止中の水力発電機の発電機界磁回路の絶縁が低下してもこの水力発電機を所定の乾燥運転時間だけ自動的に乾燥運転させることができるので、作業員が現地に出向いて乾燥運転を実施しなくても停止中の水力発電機の発電機界磁回路の絶縁を回復させることができるという効果を奏する。 The hydroelectric generator insulation recovery device of the present invention can automatically dry the hydroelectric generator for a predetermined drying operation time even if the insulation of the generator field circuit of the hydroelectric generator that is stopped decreases. Therefore, there is an effect that the insulation of the generator field circuit of the hydroelectric generator that is stopped can be recovered even if the worker goes to the site and does not perform the drying operation.
上記の目的を、絶縁低下検出手段によって停止中の水力発電機の発電機界磁回路の絶縁低下が検出されると、乾燥運転手段によってこの水力発電機を所定の乾燥運転時間だけ乾燥運転させることにより実現した。 When the insulation reduction of the generator field circuit of the stopped hydroelectric generator is detected by the insulation reduction detection means, the drying operation means causes the hydraulic power generator to dry for a predetermined drying operation time. Realized by.
以下、本発明の水力発電機絶縁回復装置の実施例について図面を参照して説明する。
本発明の水力発電機絶縁回復装置は、以下に示す２つの点を特徴とする。
（１）停止中の水力発電機の界磁巻線にも発電機励磁回路から励磁電流を供給しておき、停止中の水力発電機の発電機界磁回路の絶縁低下を界磁地絡継電器によって監視できるようにする。
（２）停止中の水力発電機の発電機界磁回路の絶縁低下が界磁地絡継電器によって検出されると、この水力発電機を自動的に乾燥運転（無負荷無励磁運転）させる。
Embodiments of the hydroelectric generator insulation recovery device of the present invention will be described below with reference to the drawings.
The hydroelectric generator insulation recovery device of the present invention is characterized by the following two points.
(1) An exciting current is also supplied from the generator excitation circuit to the field winding of the stopped hydroelectric generator to reduce the insulation of the generator field circuit of the stopped hydroelectric generator. Can be monitored by.
(2) When a decrease in insulation of the generator field circuit of the stopped hydroelectric generator is detected by the field ground fault relay, the hydroelectric generator is automatically dried (no-load non-excited operation).
これを実現するため、本発明の一実施例による水力発電機絶縁回復装置は、図１に示す絶縁回復用電磁弁制御回路１０を具備する。
また、図１に示す発電機励磁回路４’は、以下に示す２つの点で図３に示した発電機励磁回路４と相違する。
（１）第１および第２の水力発電機１1，１2が停止中でも第１および第２の励磁電流Ｉ1，Ｉ2を第１および第２の界磁巻線１a1，１a2に供給する。なお、停止中の第１および第２の水力発電機１1，１2の第１および第２の界磁巻線１a1，１a2に第１および第２の励磁電流Ｉ1，Ｉ2を供給しても、第１および第２の水力発電機１1，１2が備える第１および第２の水車に水が流されない限り第１および第２の水力発電機１1，１2は発電しない。
（２）第１の運転中通知信号Ｔ1（第１の水力発電機１1が運転中であるとハイレベルの信号）と第２の運転中通知信号Ｔ2（第２の水力発電機１2が運転中であるとハイレベルの信号）とを絶縁回復用電磁弁制御回路１０に出力する。
（３）第１および第２の水力発電機１1，１2が停止中に第１および第２の閉塞継電器６1，６2から第１および第２の水力発電機１1，１2を停止するように指示する第１および第２の停止指示信号が入力されると、第１および第２の界磁巻線１a1，１a2への第１および第２の励磁電流Ｉ1，Ｉ2の供給を所定の乾燥運転時間だけ中止する。
In order to realize this, a hydroelectric generator insulation recovery device according to one embodiment of the present invention includes an insulation recovery electromagnetic valve control circuit 10 shown in FIG.
The generator excitation circuit 4 ′ shown in FIG. 1 is different from the generator excitation circuit 4 shown in FIG. 3 in the following two points.
(1) The first and second exciting currents I 1 and I 2 are applied to the first and second field windings 1 a1 and 1 a2 even when the first and second hydraulic power generators 1 1 and 1 2 are stopped. Supply. The first and second exciting currents I 1 and I 2 are applied to the first and second field windings 1 a1 and 1 a2 of the stopped first and second hydroelectric generators 1 1 and 1 2 , respectively. Even if supplied, the first and second hydraulic power generators 1 1 and 1 2 generate power as long as water does not flow into the first and second water turbines included in the first and second hydraulic power generators 1 1 and 1 2. do not do.
(2) First in-operation notification signal T 1 (high level signal when the first hydroelectric generator 1 1 is in operation) and second in-operation notification signal T 2 (second hydroelectric generator 1 2 is output to the solenoid valve control circuit 10 for insulation recovery.
(3) first and second hydroelectric generator 1 1, 1 2 closed relay 6 of the first and second during stop, 6 2 from the first and second hydroelectric generator 1 1, 1 2 When the first and second stop instruction signals instructing to stop are input, the first and second exciting currents I 1 and I to the first and second field windings 1 a1 and 1 a2 are input. The supply of 2 is stopped for a predetermined drying operation time.
絶縁回復用電磁弁制御回路１０は、第１の水力発電機１1が停止中に第１の水力発電機１1の第１の界磁巻線１a1の正極側と接地との間に接続された第１の界磁地絡継電器５1から第１の事故発生通知信号Ｓ1が入力されると、第１の電磁弁７1を乾燥運転時間だけ開くための第１の電磁弁制御信号ＶCON1を第１の電磁弁７1に出力するとともに、第２の水力発電機１2が停止中に第２の水力発電機１2の第２の界磁巻線１a2の正極側と接地との間に接続された第２の界磁地絡継電器５2から第２の事故発生通知信号Ｓ2が入力されると、第２の電磁弁７2を乾燥運転時間だけ開くための第２の電磁弁制御信号ＶCON2を第２の電磁弁７2に出力する。
このため、絶縁回復用電磁弁制御回路１０は、図２に示すように、第１の界磁地絡継電器５1から入力される第１の事故発生通知信号Ｓ1と発電機励磁回路４’から入力される第１の運転中通知信号Ｔ1の極性を反転した信号との論理積をとる第１の論理積回路１１1と、第２の界磁地絡継電器５2から入力される第２の事故発生通知信号Ｓ2と発電機励磁回路４’から入力される第２の運転中通知信号Ｔ2の極性を反転した信号との論理積をとる第２の論理積回路１１2と、第１の論理積回路１１1からハイレベルの信号が入力されると乾燥運転時間だけ第１の電磁弁制御信号ＶCON1を出力する第１のタイマー１２1（第１の電磁弁制御信号発生手段）と、第２の論理積回路１１2からハイレベルの信号が入力されると乾燥運転時間だけ第２の電磁弁制御信号ＶCON2を出力する第２のタイマー１２2（第２の電磁弁制御信号発生手段）とを備える。
なお、第１の論理積回路１１1と第１のタイマー１２1とは第１の電磁弁制御信号発生手段として機能し、第２の論理積回路１１2と第２のタイマー１２2とは第２の電磁弁制御信号発生手段として機能する。
Insulation recovery solenoid valve control circuit 10, connected between ground and the first positive electrode side of the hydroelectric generator 1 1 first field winding 1 a1 of the first hydroelectric generator 1 1 during the stop the first field ground絡継from collector 5 1 when the first accident notification signal S 1 is input, the first solenoid valve control signal for opening only drying operation time of the first solenoid valve 7 1 which is it outputs the V CON1 to the first solenoid valve 7 1, grounding second hydroelectric generator 1 2 a positive electrode side of the second hydroelectric generator 1 2 of the second field winding 1 a2 during the stop second to open only from the second field ground絡継collector 5 2 connected the second accident notification signal S 2 is input, the second solenoid valve 7 2 drying operation time between the Is output to the second solenoid valve 72 .
Therefore, insulation recovery solenoid valve control circuit 10, as shown in FIG. 2, the first field ground絡継first accident notification signals S 1 and the generator excitation circuit 4 inputted from collector 5 1 ' the first inverted signal of the polarity during operation notification signal T 1 of the first aND circuit 11 1 of the ANDing is input from the second field ground絡継collector 5 2 inputted from A second logical product circuit 11 2 that takes a logical product of the accident occurrence notification signal S 2 of No. 2 and a signal obtained by inverting the polarity of the second in-operation notification signal T 2 input from the generator excitation circuit 4 ′; When a high level signal is input from the first AND circuit 11 1, a first timer 12 1 (first solenoid valve control signal generating means) that outputs the first solenoid valve control signal V CON1 only during the drying operation time. ) and a second aND circuit 11 only 2 and a high level signal is inputted drying operation time second solenoid valve And a second timer 12 2 to output a control signal V CON2 (second solenoid valve control signal generating means).
The first AND circuit 11 1 and the first timer 12 1 function as first electromagnetic valve control signal generation means, and the second AND circuit 11 2 and the second timer 12 2 2 function as a solenoid valve control signal generating means.
第１および第２の電磁弁７1，７2は、電磁弁制御回路によって第１および第２の電磁弁７1，７2を閉じるように制御されている場合でも、絶縁回復用電磁弁制御回路１０から第１および第２の事故発生通知信号Ｓ1，Ｓ2が入力されると、第１および第２の電磁弁７1，７2を乾燥運転時間だけ開くように制御される。 Even when the first and second solenoid valves 7 1 , 7 2 are controlled by the solenoid valve control circuit to close the first and second solenoid valves 7 1 , 7 2 , the insulation recovery solenoid valve control When the first and second accident occurrence notification signals S 1 and S 2 are input from the circuit 10, the first and second electromagnetic valves 7 1 and 7 2 are controlled to be opened for the drying operation time.
次に、第１の水力発電機１1が運転中で第２の水力発電機１2が停止中である場合に停止中の第２の水力発電機１2の発電機界磁回路が絶縁低下したときの本実施例による水力発電機絶縁回復装置の動作について説明する。 Next, the first hydroelectric generator 1 1 second hydroelectric generator 1 2 decrease the generator field circuit of the second hydroelectric generator 1 2 stopped when it is stopped insulation in operation The operation of the hydroelectric generator insulation recovery device according to the present embodiment will be described.
第１および第２の水力発電機１1，１2の発電機界磁回路の絶縁が低下していない場合には、ロウレベルの第１および第２の事故発生通知信号Ｓ1，Ｓ2が第１および第２の界磁地絡継電器５1，５2から絶縁回復用電磁弁制御回路１０に出力されているため、絶縁回復用電磁弁制御回路１０の第１および第２の論理積回路１１1，１１2にはロウレベルの第１および第２の事故発生通知信号Ｓ1，Ｓ2がそれぞれ入力されているので、第１および第２の論理積回路１１1，１１2の出力信号は共にロウレベルとなっている。
その結果、絶縁回復用電磁弁制御回路１０の第１および第２のタイマー１２1，１２2には第１および第２の論理積回路１１1，１１2のロウレベルの出力信号がそれぞれ入力されているため、第１および第２のタイマー１２1，１２2からそれぞれ出力される第１および第２の電子弁制御信号ＶCON1，ＶCON2は共にロウレベルとなっている。
なお、第１の水力発電機１1は運転中であるため、ハイレベルの第１の運転中通知信号Ｔ1が発電機励磁回路４’から絶縁回復用電磁弁制御回路１０に出力されているとともに、第１の電磁弁７1は電磁弁制御回路によって開かれている。また、第２の水力発電機１2は停止中であるため、ロウレベルの第２の運転中通知信号Ｔ2が発電機励磁回路４’から絶縁回復用電磁弁制御回路１０に出力されているとともに、第２の電磁弁７2は電磁弁制御回路によって閉じられている。
If the insulation of the first and second hydroelectric generator 1 1, 1 2 of the generator field circuit is not decreased, the first and second accident at a low level notification signal S 1, S 2 is the Since the first and second field ground fault relays 5 1 and 5 2 output the insulation recovery electromagnetic valve control circuit 10, the first and second AND circuits 11 of the insulation recovery electromagnetic valve control circuit 10. 1, 11 since 2 accident occurrence notification signals S 1 first and second low level in, S 2 are inputted respectively, first and second aND circuit 11 1, 11 2 of the output signal are both It is low level.
As a result, the low level output signals of the first and second AND circuits 11 1 and 11 2 are respectively input to the first and second timers 12 1 and 12 2 of the insulation recovery solenoid valve control circuit 10. Therefore, both the first and second electronic valve control signals V CON1 and V CON2 output from the first and second timers 12 1 and 12 2 are low level.
Since the first hydroelectric generator 1 1 is in operation, a high-level first in-operation notification signal T 1 is output from the generator excitation circuit 4 ′ to the insulation recovery electromagnetic valve control circuit 10. together, the first solenoid valve 7 1 is opened by the solenoid valve control circuit. The second hydroelectric generator 1 2 because it is stopped, the second operation in the notification signal T 2 of the low level is outputted from the generator excitation circuit 4 'to the solenoid valve control circuit 10 for insulation recovery , the second solenoid valve 7 2 is closed by the electromagnetic valve control circuit.
このような状態で、停止中の第２の水力発電機１2の発電機界磁回路が絶縁低下すると、第２の界磁巻線１a2の正極側と接地との間に接続された第２の界磁地絡継電器５2に整定値以上の事故電流が入力されるために第２の界磁地絡継電器５2が動作して、ハイレベルの第２の事故発生通知信号Ｓ2が第２の界磁地絡継電器５2から第２の閉塞継電器６2および絶縁回復用電磁弁制御回路１０に出力される。 In this state, the generator field circuit of the second hydroelectric generator 1 2 in stop is connected between the reduced insulation, the positive electrode side of the second field winding 1 a2 and the ground 2 of field ground絡継collector 5 to 2 to set value or more fault current is input by operating the second field ground絡継collector 5 2, second accident occurrence notification signal S 2 at the high level output from the second field ground絡継Electric 5 2 to the second occlusion relay 6 2 and the insulating recovery solenoid valve control circuit 10.
第２の閉塞継電器６2は、ハイレベルの第２の事故発生通知信号Ｓ2が第２の界磁地絡継電器５2から入力されると、第２の水力発電機１2を停止するように指示するハイレベルの第２の停止指示信号Ｕ2を発電機励磁回路４’および電磁弁制御回路に出力する。 The second closure relay 6 2, when the accident notification signal S 2 second high level is input from the second field ground絡継Electric 5 2, to stop the second hydroelectric generator 1 2 a second stop instruction signal U 2 of the high-level instruction to output to the generator excitation circuit 4 'and the solenoid valve control circuit.
ハイレベルの第２の停止指示信号Ｕ2が第２の閉塞継電器６2から入力されると、発電機励磁回路４’は第２の界磁巻線１a2への第２の励磁電流Ｉ2の供給を乾燥運転時間だけ中止し、電磁弁制御回路は第２の電磁弁７2を閉じた状態のままとする。 When the second stop instruction signal U 2 of a high level is input from the second closed relay 6 2, generator excitation circuit 4 'is the second excitation to the second field winding 1 a2 current I 2 the supply of only stop the drying operation time, the solenoid valve control circuit to remain closed second solenoid valve 7 2.
しかし、絶縁回復用電磁弁制御回路１０では、ハイレベルの第２の事故発生通知信号Ｓ2が第２の界磁地絡継電器５2から入力されると、ハイレベルの第２の事故発生通知信号Ｓ2とロウレベルの第２の運転中通知信号Ｔ2とが第２の論理積回路１１2に入力されるため、第２の論理積回路１１2の出力信号はロウレベルからハイレベルとなる。
その結果、絶縁回復用電磁弁制御回路１０の第２のタイマー１２2には第２の論理積回路１１2からハイレベルの出力信号が入力されるため、第２のタイマー１２2から出力される第２の電磁弁制御信号ＶCON2はロウレベルからハイレベルとなるので、第２の電磁弁７2が乾燥運転時間だけ開かれて第２の水車に水が流される。
However, the solenoid valve control circuit 10 for insulating recovered and second accident notification signal S 2 of a high level is input from the second field ground絡継Electric 5 2, the second accident notification high level since the signal S 2 and the second operating in notification signal at the low level T 2 is input a second aND circuit 11 2, the second output signal of the aND circuit 11 2 becomes a high level from a low level.
As a result, since the high-level output signal is input from the second AND circuit 11 2 to the second timer 12 2 of the insulation recovery solenoid valve control circuit 10, the second timer 12 2 outputs the second timer 12 2. since the second solenoid valve control signal V CON2 is at a high level from a low level, the water flowed into the second water wheel second solenoid valve 7 2 is opened only drying operation time.
これにより、第２の水力発電機１2が乾燥運転時間だけ乾燥運転（無負荷無励磁運転）されて、第２の水力発電機１2が乾燥される。 As a result, the second hydroelectric generator 12 is dried (no-load non-excited operation) for the drying operation time, and the second hydroelectric generator 12 is dried.
その後、乾燥時間が経過すると、絶縁回復用電磁弁制御回路１０の第２のタイマー１２2から出力される第２の電磁弁制御信号ＶCON2はハイレベルからロウレベルとなるので、第２の電磁弁７2が閉じられて第２の水車に水が流されなくなる。また、発電機励磁回路４’は、第２の界磁巻線１a2への第２の励磁電流Ｉ2の供給を再開する。
このとき、乾燥運転によって第２の水力発電機１2の発電機界磁回路の絶縁状態が回復していると、第２の界磁地絡継電器５2には整定値よりも小さい電流が入力されるために第２の界磁地絡継電器５2は不動作となり、第２の事故発生通知信号Ｓ2はハイレベルからロウレベルとなる。
その結果、絶縁回復用電磁弁制御回路１０の第２の論理積回路１１2に入力される第２の事故発生通知信号Ｓ2はハイレベルからロウレベルとなるため、第２の論理積回路１１2の出力信号はハイレベルからロウレベルとなる。
これにより、第２のタイマー１２2から出力される第２の電磁弁制御信号ＶCON2はロウレベルのままとなる。
Thereafter, the drying time has elapsed, since the second second solenoid valve control signal V CON2 outputted from the timer 12 and second solenoid valve control circuit 10 for insulation recovery from the high level to the low level, the second solenoid valve 7 2 is closed and no water is allowed to flow into the second turbine. Further, the generator excitation circuit 4 ′ restarts the supply of the second excitation current I 2 to the second field winding 1 a2 .
In this case, drying the insulation state of the second generator field circuit of hydroelectric generator 1 2 by the operation is restored, the second field ground絡継collector 5 2 small current is input than is setting value in the second field ground絡継collector 5 2 becomes inoperative because the accident occurrence notification signal S 2 of the second consists of the high level to the low level.
As a result, the second accident occurrence notification signal S 2 input to the second AND circuit 11 2 of the insulation recovery solenoid valve control circuit 10 changes from the high level to the low level, and thus the second AND circuit 11 2. Output signal changes from high level to low level.
As a result, the second electromagnetic valve control signal V CON2 output from the second timer 12 2 remains at the low level .
なお、運転中の第１の水力発電機１1の発電機界磁回路が絶縁低下した場合には、第１の界磁巻線１a1の正極側と接地との間に接続された第１の界磁地絡継電器５1に整定値以上の事故電流が入力されるために第１の界磁地絡継電器５1が動作して、ハイレベルの第１の事故発生通知信号Ｓ1が第１の界磁地絡継電器５1から第１の閉塞継電器６1および絶縁回復用電磁弁制御回路１０に出力される。 Note that the generator field circuit of the first hydroelectric generator 1 1 during operation when the decreased insulation, which is connected between ground and the positive electrode side of the first field winding 1 a1 1 field ground絡継first field ground to the collector 5 1 setpoint or more fault current is input絡継collector 5 1 operates the first accident notification signals S 1 a high-level first output from the first field ground絡継Electric 5 1 in the first closed relay 61 and the insulating recovery solenoid valve control circuit 10.
第１の閉塞継電器６1は、ハイレベルの第１の事故発生通知信号Ｓ1が第１の界磁地絡継電器５1から入力されると、第１の水力発電機１1を停止するように指示するハイレベルの第１の停止指示信号を発電機励磁回路４’および電磁弁制御回路に出力する。
ハイレベルの第１の停止指示信号が第１の閉塞継電器６1から入力されると、発電機励磁回路４’は第１の励磁電流Ｉ1の第１の界磁巻線１a1への供給を中止し、電磁弁制御回路は第１の電磁弁７1を閉じる。これにより、運転中の第１の水力発電機１1を緊急停止する。
First closure relay 61, when the first accident notification signals S 1 of a high level is input from the first field ground絡継Electric 5 1, so as to stop the first and hydroelectric generator 1 1 A high-level first stop instruction signal is output to the generator excitation circuit 4 ′ and the solenoid valve control circuit.
When the first stop instruction signal of high level is input from the first closed relay 61, generator excitation circuit 4 'is supplied to the first excitation current first field winding 1 a1 of I 1 was discontinued, the solenoid valve control circuit closes the first solenoid valve 7 1. As a result, the operating first hydroelectric generator 11 is urgently stopped.
第１の励磁電流Ｉ1の第１の界磁巻線１a1への供給が中止されると、第１の界磁地絡継電器５1には整定値よりも小さい電流が入力されるために第１の界磁地絡継電器５1は不動作となり、第１の事故発生通知信号Ｓ1はハイレベルからロウレベルとなる。また、運転中の第１の水力発電機１1が緊急停止させられると、第１の運転中通知信号Ｔ1はハイレベルからロウレベルとなる。
その結果、絶縁回復用電磁弁制御回路１０の第１の論理積回路１１1に入力される第１の運転中通知信号Ｔ1はハイレベルからロウレベルとなるが、第１の論理積回路１１1に入力される第１の事故発生通知信号Ｓ1はハイレベルからロウレベルとなるため、第１の論理積回路１１1の出力信号はロウレベルのままとなる。
これにより、絶縁回復用電磁弁制御回路１０の第１のタイマー１２1に入力される第１の論理積回路１１の出力信号はロウレベルのままとなるため、第１のタイマー１２1からに出力される第１の電磁弁制御信号ＶCON1はロウレベルのままとなる。
When the first excitation current supply to the first field winding 1 a1 of I 1 is stopped, the first field ground絡継Electric 5 1 for small current is input than set value the first field ground絡継collector 5 1 becomes inoperative, the first accident notification signals S 1 consists of the high level to the low level. Further, when the first hydroelectric generator 1 1 in operation is urgently stopped, the first in-operation notification signal T 1 is changed from a high level to a low level.
As a result, the first in-operation notification signal T 1 inputted to the first AND circuit 11 1 of the insulation recovery solenoid valve control circuit 10 changes from the high level to the low level, but the first AND circuit 11 1. Since the first accident occurrence notification signal S 1 input to is changed from the high level to the low level, the output signal of the first AND circuit 11 1 remains at the low level.
As a result, the output signal of the first AND circuit 11 input to the first timer 12 1 of the insulation recovery solenoid valve control circuit 10 remains at a low level, and is therefore output from the first timer 12 1. The first solenoid valve control signal V CON1 remains at a low level .
以上の説明では、電磁弁制御回路と別に絶縁回復用電磁弁制御回路１０を設けたが、電磁弁制御回路に絶縁回復用電磁弁制御回路１０の機能を持たせるようにしてもよい。 In the above description, the insulation recovery solenoid valve control circuit 10 is provided separately from the solenoid valve control circuit. However, the solenoid valve control circuit may have the function of the insulation recovery solenoid valve control circuit 10.
１1，１2 第１および第２の水力発電機
１a1，１a2 第１および第２の界磁巻線
２1，２2 第１および第２の排気ダクト
３1，３2 第１および第２の排気ダンパー
４、４’ 発電機励磁回路
５1，５2 第１および第２の界磁地絡継電器
６1，６2 第１および第２の閉塞継電器
７1，７2 第１および第２の電磁弁
１０ 絶縁回復用電磁弁制御回路
１１1，１１2 第１および第２の論理積回路
１２1，１２2 第１および第２のタイマー
Ｉ1，Ｉ2 第１および第２の励磁電流
Ｓ1，Ｓ2 第１および第２の事故発生通知信号
Ｔ1，Ｔ2 第１および第２の運転中通知信号
Ｕ1，Ｕ2 第１および第２の停止指示信号
ＶCON1，ＶCON2 第１および第２の電磁弁制御信号
1 1 , 1 2 1st and 2nd hydroelectric generators 1 a1 , 1 a2 1st and 2nd field windings 2 1 , 2 2 1st and 2nd exhaust ducts 3 1 , 3 2 1st and 2nd exhaust damper 4, 4 'generator excitation circuit 5 1 , 5 2 first and second field ground fault relays 6 1 , 6 2 first and second closed relays 7 1 , 7 2 first and Second solenoid valve 10 Insulation recovery solenoid valve control circuit 11 1 , 11 2 First and second AND circuits 12 1 , 12 2 First and second timers I 1 , I 2 First and second timers Excitation currents S 1 and S 2 First and second accident occurrence notification signals T 1 and T 2 First and second in-operation notification signals U 1 and U 2 First and second stop instruction signals V CON1 and V 2 CON2 first and second solenoid valve control signals
Claims (4)
前記水力発電機の発電機界磁回路の絶縁低下を検出するための絶縁低下検出手段と、
該絶縁低下検出手段によって前記水力発電機の発電機界磁回路の絶縁低下が検出されると、該水力発電機を所定の乾燥運転時間だけ乾燥運転させる乾燥運転手段と、
を具備することを特徴とする、水力発電機絶縁回復装置。 A hydroelectric generator insulation recovery device for recovering the insulation of the generator field circuit of the hydroelectric generator when the insulation of the generator field circuit of the hydroelectric generator (1 2 ) is stopped. ,
Insulation drop detection means for detecting insulation drop of the generator field circuit of the hydroelectric generator;
When the insulation reduction detection means detects a reduction in insulation of the generator field circuit of the hydroelectric generator, a drying operation means for drying the hydroelectric generator for a predetermined drying operation time; and
A hydroelectric generator insulation recovery device comprising:
前記絶縁低下検出手段が、前記水力発電機の前記界磁巻線に接続された界磁地絡継電器（５2）を備え、
前記乾燥運転手段が、前記界磁地絡継電器によって停止中の前記水力発電機の発電機界磁回路の絶縁低下が検出されると、該水力発電機が備える水車に水を流すための給水管に設けられた電磁弁（７2）を前記乾燥運転時間だけ開くための電磁弁制御信号（ＶCON2）を発生する電磁弁制御信号発生手段（１１2，１２2）を備え、
前記発電機励磁手段が、前記絶縁低下検出手段として機能して、前記水力発電機が停止中であるときにも該水力発電機の前記界磁巻線に前記励磁電流を供給するとともに、該水力発電機が停止中であるときに前記界磁地絡継電器によって該水力発電機の発電機界磁回路の絶縁低下が検出されると、前記乾燥運転手段として機能して、該水力発電機の該界磁巻線への該励磁電流の供給を前記乾燥運転時間だけ中止する、
ことを特徴とする、請求項１記載の水力発電機絶縁回復装置。 Generator generator (4 ′) for supplying an excitation current (I 2 ) to the field winding (1 a2 ) of the hydroelectric generator when the hydroelectric generator is in operation;
The insulating drop detecting means comprises the hydro-generator of the field winding connected to a field ground絡継Electric (5 2),
When the drying operation means detects a decrease in insulation of the generator field circuit of the hydroelectric generator that is stopped by the field ground fault relay, a water supply pipe for flowing water to the water turbine provided in the hydroelectric generator Comprising electromagnetic valve control signal generating means (11 2 , 12 2 ) for generating an electromagnetic valve control signal (V CON2 ) for opening the electromagnetic valve (7 2 ) provided in the valve for the drying operation time,
The generator excitation means functions as the insulation lowering detection means to supply the excitation current to the field winding of the hydraulic power generator even when the hydraulic power generator is stopped, When a decrease in insulation of the generator field circuit of the hydroelectric generator is detected by the field ground fault relay when the generator is stopped, it functions as the drying operation means, and the hydroelectric generator Stopping the supply of the excitation current to the field winding for the drying operation time;
The hydroelectric generator insulation recovery device according to claim 1, wherein:
運転中の前記第１の水力発電機の第１の界磁巻線（１a1）に第１の励磁電流（Ｉ1）を供給するとともに停止中の前記第２の水力発電機の第２の界磁巻線（１a2）にも第２の励磁電流（Ｉ2）を供給する発電機励磁手段（４’）と、
前記第１および第２の水力発電機の発電機界磁回路の絶縁低下を検出するための絶縁低下検出手段と、
該絶縁低下検出手段によって前記第２の水力発電機の発電機界磁回路の絶縁低下が検出されると、該第２の水力発電機を所定の乾燥運転時間だけ乾燥運転させる乾燥運転手段と、
前記絶縁低下検出手段によって前記第１の水力発電機の発電機界磁回路の絶縁低下が検出されると、該第１の水力発電機を緊急停止させる緊急停止手段と、
を具備することを特徴とする、水力発電機絶縁回復装置。 Of the first and second hydroelectric generators (1 1 , 1 2 ), the second hydroelectric generator is operating when the first hydroelectric generator is operating and the second hydroelectric generator is stopped. A hydroelectric generator insulation recovery device for recovering the insulation of the generator field circuit of the second hydroelectric generator when the insulation reduction of the generator field circuit of the generator occurs,
A first excitation current (I 1 ) is supplied to the first field winding (1 a1 ) of the first hydroelectric generator in operation, and the second hydraulic power generator in the second hydroelectric generator is stopped. Generator excitation means (4 ′) for supplying a second excitation current (I 2 ) to the field winding (1 a2 );
Insulation lowering detection means for detecting insulation lowering of the generator field circuit of the first and second hydraulic power generators;
A drying operation means for drying the second hydroelectric generator for a predetermined drying operation time when the insulation reduction of the generator field circuit of the second hydroelectric generator is detected by the insulation reduction detecting means;
An emergency stop means for urgently stopping the first hydroelectric generator when an insulation drop of the generator field circuit of the first hydraulic power generator is detected by the insulation lowering detection means;
A hydroelectric generator insulation recovery device comprising:
前記乾燥運転手段が、前記第１の界磁地絡継電器によって前記第１の水力発電機の発電機界磁回路の絶縁低下が検出されても、該第１の水力発電機が備える第１の水車に水を流すための第１の給水管に設けられた第１の電磁弁（７1）を前記乾燥運転時間だけ開くための第１の電磁弁制御信号（ＶCON1）を発生しないが、前記第２の界磁地絡継電器によって前記第２の水力発電機の発電機界磁回路の絶縁低下が検出されると、該第２の水力発電機が備える第２の水車に水を流すための第２の給水管に設けられた第２の電磁弁（７2）を前記乾燥運転時間だけ開くための第２の電磁弁制御信号（ＶCON2）を発生する絶縁回復用電磁弁制御手段（１０）を備え、
前記発電機励磁手段が、前記第１の界磁地絡継電器によって前記第１の水力発電機の発電機界磁回路の絶縁低下が検出されると、前記緊急停止手段として機能して、該第１の水力発電機の前記第１の界磁巻線への前記第１の励磁電流の供給を中止するとともに、前記第２の界磁地絡継電器によって前記第２の水力発電機の発電機界磁回路の絶縁低下が検出されると、前記乾燥運転手段として機能して、該第２の水力発電機の前記第２の界磁巻線への前記第２の励磁電流の供給を前記乾燥運転時間だけ中止する、
ことを特徴とする、請求項３記載の水力発電機絶縁回復装置。 The insulation lowering detection means includes a first field ground fault relay (5 1 ) connected to the first field winding of the first hydroelectric generator and the first of the second hydroelectric generator. A second field ground fault relay (5 2 ) connected to the two field windings;
Even if the drying operation means detects a decrease in insulation of the generator field circuit of the first hydroelectric generator by the first field ground fault relay, the first hydroelectric generator includes a first A first solenoid valve control signal (V CON1 ) for opening the first solenoid valve (7 1 ) provided in the first water supply pipe for flowing water to the water turbine for the drying operation time is not generated. When a decrease in insulation of the generator field circuit of the second hydroelectric generator is detected by the second field ground fault relay, water is caused to flow to the second turbine provided in the second hydroelectric generator. Insulation recovery solenoid valve control means for generating a second solenoid valve control signal (V CON2 ) for opening the second solenoid valve (7 2 ) provided in the second water supply pipe for the drying operation time ( 10)
When the generator excitation means detects a decrease in insulation of the generator field circuit of the first hydroelectric generator by the first field ground fault relay, the generator excitation means functions as the emergency stop means, The supply of the first exciting current to the first field winding of one hydroelectric generator is stopped, and the generator field of the second hydroelectric generator is caused by the second field ground fault relay. When a decrease in insulation of the magnetic circuit is detected, the drying operation means functions to supply the second excitation current to the second field winding of the second hydraulic power generator. Stop for hours,
The hydroelectric generator insulation recovery device according to claim 3, wherein:
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