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1. 发明专利

JPH04308426A GENERATOR PROTECTIVE DEVICE 失效
公开(公告)号：JPH04308426A
公开(公告)日：1992-10-30
申请号：JP7327591
申请日：1991-04-05
申请人： TOSHIBA CORP
发明人： SAKAGUCHI TAMOTSU
IPC分类号： H02H7/06 , H02J3/26 , H02P9/00
摘要： PURPOSE:To prevent the deterioration of the service life and damage of the rotor, turbine, and shaft system of a generator and, at the same time, to continuously and stably supply electric power to a power system from the generator. CONSTITUTION:When a current signal flowing to a three-phase circuit connecting a generator 11 to a power system is inputted to an opposite-phase current discriminator 17 after the signal is converted into an opposite-phase current value by means of a current-converter 16, the discriminator 17 compares the opposite-phase current value with a control value set by an opposite-phase current control value setter 18 and, when the opposite-phase current value exceeds the control value, detects unbalanced amounts between the magnitudes and phases of the current values of the three phases obtained from the current signal by operating a three-phase current value unbalanced amount detector 19. A resistance and reactor which are connected to the three-phase circuit in a state where they can be turned on are turned on by means of a circuit breaker 21 by finding the impedance amount required for balancing the three- phase current values.

2. 发明专利

JPH10229686A STARTER OF SYNCHRONOUS GENERATOR 失效
公开(公告)号：JPH10229686A
公开(公告)日：1998-08-25
申请号：JP4696297
申请日：1997-02-17
申请人： TOSHIBA CORP
发明人： SAKAGUCHI TAMOTSU
IPC分类号： H02P1/54
摘要： PROBLEM TO BE SOLVED: To provide the starter of a synchronous generator which can improve reliability at the start of a plurality of synchronous motors, without enlarging the occupied space. SOLUTION: Synchronous generators 8 are started individually, by outputting the AC voltage of a variable frequency to the terminal circuit of the synchronous generator by thyristor starters 10, provided separately for each of plural synchronous generator 8. Then, when any of the thyristors 10 becomes faulty, a connection switch 11 switches a connection and supplies to the terminal circuit of the synchronous generator 8 which the faulty thyristor starter 10 should have started, an AV voltage of variable frequency from other sound thyristor starter 10. Hereby, the reliability for the start of the synchronous generator 8 is improved.

3. 发明专利

JPH04344127A HARMONIC CURRENT PREVENTING DEVICE 失效
公开(公告)号：JPH04344127A
公开(公告)日：1992-11-30
申请号：JP11493791
申请日：1991-05-20
申请人： TOSHIBA CORP
发明人： SAKAGUCHI TAMOTSU
IPC分类号： H02J3/01
摘要： PURPOSE:To shunt low and high order harmonic currents from a main circuit of a power plant by employing a resonance circuit having a resistor, a reactor and a capacitor. CONSTITUTION:Power system 1 sides (high voltage sides) of main transformers 6 are respectively connected to a harmonic current preventing device body (HI) 12 through a circuit breaker 11. The breaker 11 is closed at the time of operating a power plant 10 to connect the HI 12 to the main circuit of the plant 10. The HI 12 has a quinary shunt circuit 121 of a single shunt circuit for shunting a low order harmonic current from the system into the plant 10, from the main circuit of the plant 10, a septenary shunt circuit 122 and a high order shunt circuit 123 for shunting a high order harmonic current from the system 1 to the plant 10, from the main circuit of the plant 10, which each has a resistor, a reactor and a capacitor. Accordingly, since the harmonic current is absorbed to the HI 12, no harmonic current flows to a generator 7, various transformers 6, 8, a relay group 9 in the plant 10.

4. 发明专利

JPH11252998A GENERATOR CONTROLLER 失效
公开(公告)号：JPH11252998A
公开(公告)日：1999-09-17
申请号：JP5384398
申请日：1998-03-05
申请人： TOHOKU ELECTRIC POWER CO , TOSHIBA CORP
发明人： HATAKEYAMA TAKASHI , MITSUMOTO NORIFUMI , TAKAGI YASUO , SHINOHARA KAZUTARO , KAMIMURA YOICHI , SAKAGUCHI TAMOTSU
IPC分类号： H02P9/04 , H02P9/14
摘要： PROBLEM TO BE SOLVED: To secure control adaptability in cooperative control without deteriorating the quick voltage recovery, which is an advantage of quick-response excitation. SOLUTION: A generator controller is provided with a number-of-revolution detecting means 11 which detects the number of revolutions of a generator 2, and an active power detecting means 12 which detects the active power in the power generated from the generator 2. The controller is also provided with a cooperative control means 10, which cooperatively controls a power system stabilizer(PSS) 9 and a governor control system 5, to operate the PSS 9 to supply a correction amount with respect to the fluctuations of the high and low frequency components regarding the deviation between the active power and a prescribed set value in a high frequency band, by regarding the deviation as the deviation of the target value of an automatic voltage adjuster 8, and to operate the governor control system 5 for suppressing the fluctuation of substantial mechanical torque with respect to the fluctuations of the frequency components in a low frequency band, by regarding the fluctuations of the low frequency components as the substantial fluctuations of the mechanical torque.

5. 发明专利

JPS6482210A ON-LOAD TAP SWITCHING DEVICE 失效
公开(公告)号：JPS6482210A
公开(公告)日：1989-03-28
申请号：JP23880187
申请日：1987-09-25
申请人： TOSHIBA CORP
发明人： KATAURI TOMOO , SAKAGUCHI TAMOTSU
IPC分类号： G05F1/14
摘要： PURPOSE:To prevent the repetition of an unnecessary tap switching action by operating the mean value of respective winding voltages at the secondary side and tertiary side of three-winding transformer and canceling the unbalance of respective voltages. CONSTITUTION:When the voltage of a secondary side winding 2 detected from the secondary voltage signal of a transformer 6 for a secondary side winding measuring instrument is in an action area in being dislocated from an LTC voltage setting value to a lower side by a fixed quantity and the voltage of a tertiary side winding 3 detected from the secondary voltage signal of a transformer 7 for a tertiary side winding measuring instrument is in a blind sector in being dislocated from the LTC voltage setting value to a higher side, a voltage control circuit 12 operates the mean value of the voltages of the windings 2 and 3. Thus, the unbalance of the voltages of the windings 2 and 3 is canceled. Only when the difference between the mean value obtained by the operation and the LTC voltage setting value exceeds the fixed quantity, a switching signal (a) is sent, and an on-load tap switching driver 8 is operated.

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