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1. 发明专利

JPS63263939A SIGNAL SYNCHRONIZING SYSTEM 失效
公开(公告)号：JPS63263939A
公开(公告)日：1988-10-31
申请号：JP9734987
申请日：1987-04-22
申请人： TOKYO ELECTRIC POWER CO , HITACHI LTD , HITACHI CABLE , MITSUBISHI ELECTRIC CORP , TOSHIBA CORP
发明人： YOSHIDA KAZUYOSHI , MATSUZAWA KUNIO , MAEDA TAKAFUMI , SANO KAZUHIRO , SONE FUMIKI , TAKEDA KAZUHIKO , YOSHIDA TAKASHI , SHIOBARA YASUHISA
摘要： PURPOSE:To avoid the synchronizing error of a slave station from getting larger by setting a flag representing defect of synchronization in a synchronizing data frame when a master station cannot send a synchronizing data frame. CONSTITUTION:A master station 11 for synchronization sends idle data frames DSA and DSB prior to the transmission of a synchronizing data frame D1. The length of the idle data frame DSB is varied in response to the time when the master station 11 receives tokens T1-Tn. Moreover, when the master station 11 cannot send the synchronizing data frame D1 due to delay of token arrival or the like, a flag representing defect of synchronization is set to the data field of the synchronizing data frame D1. Slave stations 12-1n, in detecting the said flag, disregard the synchronizing data frame D1 as the synchronizing signal. Since the signal synchronization of the slave stations is maintained with high accuracy, the stable signal synchronization is attained by using a token passing bus.

2. 发明专利

JPH0795718A PROTECTIVE RELAY DEVICE 失效
公开(公告)号：JPH0795718A
公开(公告)日：1995-04-07
申请号：JP23613393
申请日：1993-09-22
申请人： HITACHI LTD , TOKYO ELECTRIC POWER CO , TOSHIBA CORP , MITSUBISHI ELECTRIC CORP
发明人： KOMATSU SHINJI , SANO KAZUHIRO , MAEDA TAKAFUMI , MATSUDA SHUNICHI , OGAWARA KENJI , NAGASAKI HIROMI , SEKIGUCHI KATSUHIKO , KANEKO SEIJI
IPC分类号： H02H3/02
摘要： PURPOSE:To perform input processing work by providing a computer for performing arithmetic operations on a group of relay elements having different protecting levels, another computer for setting the relay element groups, and a communication circuit which connects the computer for setting with the computer for relay. CONSTITUTION:A main relay and accident detecting relay are selected as a group of relay elements having different protecting levels. Current and voltage signals introduced to an input converter 10 through a current transformer 8 for meter and transformer 9 for meter are transmitted to an A/D converter 11 which converts the signals into digital signals. The digital signals are sent to a main system bus 1. Upon receiving the digital signals, a computer 13 performs arithmetic operations on the signals by using a setting value read by means of a computer 14 for setting. When the accident of a power system is detected, a command is transmitted to a command operating means 15 and, when required, a circuit breaker tripping signal is outputted. The A/D-converting section 17 of a computer 16 performs arithmetic operations upon receiving information from the converter 10 and, when required, outputs the circuit breaker tripping signal.

3. 发明专利

JPH01259719A PROTECTIVE METHOD FOR TRANSFORMER 失效
公开(公告)号：JPH01259719A
公开(公告)日：1989-10-17
申请号：JP8439388
申请日：1988-04-06
申请人： HITACHI LTD , TOKYO ELECTRIC POWER CO
发明人： INAGAKI KEIZO , SANO KAZUHIRO , MATSUI YOSHIAKI , TAKAHASHI MASAKATSU , SUZUKI MAMORU , MAEDA TAKAFUMI
IPC分类号： H02H7/045
摘要： PURPOSE:To perform protection of a transformer with high accuracy and high speed, by determining the phase currents of a transformer having delta- connection windings based on the differential currents obtained on the basis of line currents fed from respective terminals of the transformer and the differential currents obtained on the basis of the phase currents, and employing the phase currents for judgement of inner fault of the transformer based on the parallel admittance of the transformer. CONSTITUTION:Differential currents are obtained with respect to line currents i1a, i1b, i1c, i2ac, i2ba, i2cb. Absolute values of these differential currents are compared with a first detection level in order to obtain the phase currents i2a, i2b, i2c of delta-connection windings. Then it is judged whether the absolute values of the differential currents concerning to these phase currents i2a. i2b, i2c are larger than a second detection level or not. Initial setting is made for the first judgement while parallel admittance is operated for second and following judgements, then the operated parallel admittance is compared with a judgement value thus judging an inner fault. If the condition continues, it is judged that an inner fault exist in the transformer and a signal for allowing trip of circuitbreaker is produced.

4. 发明专利

JPH01227546A DATA COMMUNICATION SYSTEM 失效
公开(公告)号：JPH01227546A
公开(公告)日：1989-09-11
申请号：JP5325088
申请日：1988-03-07
申请人： TOKYO ELECTRIC POWER CO , HITACHI LTD , TOSHIBA CORP , MITSUBISHI ELECTRIC CORP
发明人： MATSUMOTO TADAO , OHASHI NOBUFUMI , SANO KAZUHIRO , KANO TATSUYA , TERAO YASUHIKO
IPC分类号： H04L12/40
摘要： PURPOSE:To prevent the lowering of a data transmission efficiency due to transmission control information at the time of dividing a frame by sending data having a long updating period sent from the same station collectively. CONSTITUTION:A synchronizing data frame equipped with a counter setting command flag is transmitted from a main station to a slave station at every fixed transmission frequency, and a counter is set at a value common to all stations on a network according to the counter setting command flag at each slave station. The counter is made to advance at every token pass, two data frames are sent only when the value of the counter is made equal to the address value of its own station, and one data frame is sent when the values are different. In such a way, control is executed so as to sent the data having the long updating period only in a cycle balanced to the updating period, and the data having the log updating period are collectively transmitted. Thus, the transmission efficiency can be improved.

5. 发明专利

JPH01170318A RATIO DIFFERENTIAL RELAY 失效
公开(公告)号：JPH01170318A
公开(公告)日：1989-07-05
申请号：JP32577687
申请日：1987-12-23
申请人： HITACHI LTD , TOKYO ELECTRIC POWER CO
发明人： MATSUI YOSHIAKI , SANO KAZUHIRO , KAWAI TADAO , SASAKI HIROSHI , OURA YOSHIFUMI , YOSHIDA KAZUYOSHI , MAEDA TAKAFUMI
IPC分类号： H02H3/28
摘要： PURPOSE:To effectively distinguish a detection current due to an internal accident from that due to an external accident by obtaining an operation amount and a suppression amount at the time of nonsaturation in each cycle of a line current, and detecting the amplitude of a differential value due to a phase difference with an accident current. CONSTITUTION:A ratio differential relay is composed of operation amount calculating means, suppression amount calculating means and accident discriminating means. The operation amount calculating means calculates the sum of the momentary values of two line currents, calculates the operation amount of the relay on the basis of the absolute values of the difference of the present value of the sum of the calculated momentary values and a value before a predetermined time, calculates the scalar sum of the momentary values of the two line currents, and calculates the suppression amount of the relay on the basis of the absolute value of the difference of the present value of the calculated scalar sum and a value before a predetermined time. The accident discriminating means calculates the difference value between the operation amount and the suppression amount, and discriminates the content of the accident on the basis of the difference value.

6. 发明专利

JPS63318842A SIGNAL SYNCHRONIZING SYSTEM 失效
公开(公告)号：JPS63318842A
公开(公告)日：1988-12-27
申请号：JP15346187
申请日：1987-06-22
申请人： TOKYO ELECTRIC POWER CO , HITACHI LTD , HITACHI CABLE , MITSUBISHI ELECTRIC CORP , TOSHIBA CORP
发明人： MAEDA TAKAFUMI , SANO KAZUHIRO , SONE FUMIKI , YOSHIDA TAKASHI , YAMAURA MITSURU , SHIOBARA YASUHISA
IPC分类号： H04L7/00
摘要： PURPOSE:To realize the transmission of a synchronizing data frame synchronizing with a main synchronizing signal by changing the length of a null data frame in response to the time difference between the transmission end time point of the synchronizing data frame and the main synchronizing signal. CONSTITUTION:When the incoming call of a token is detected at a station serving as a main station of synchronization, the null data frame is transmitted prior to the transmission of a synchronizing data frame. In this case, the time difference is detected by a timer 17 containing a register between the transmission end time point of the previous synchronizing data frame and the main synchronizing signal S1 of a station synchronizing signal generating circuit 20. Thus the length of the null data frame to be transmitted next time is calculated based on said time difference for production of the null data frame. This data frame and the synchronizing data frame are added to a transmission queue before the next token is received. Thus it is possible to transmit the synchronizing data frame synchronizing with the signal S1.

7. 发明专利

JPS6289424A TRANSFORMER PROTECTING METHOD 失效
公开(公告)号：JPS6289424A
公开(公告)日：1987-04-23
申请号：JP22678885
申请日：1985-10-14
申请人： TOKYO ELECTRIC POWER CO , HITACHI LTD
发明人： OURA YOSHIFUMI , MATSUZAWA KUNIO , YOSHIDA KAZUYOSHI , INAGAKI KEIZO , KUDO HIROYUKI , SANO KAZUHIRO
IPC分类号： H02H3/44 , H02H7/04

8. 发明专利

JPH07111726A PROTECTIVE RELAY 失效
公开(公告)号：JPH07111726A
公开(公告)日：1995-04-25
申请号：JP25137693
申请日：1993-10-07
申请人： HITACHI LTD , TOKYO ELECTRIC POWER CO , TOSHIBA CORP , MITSUBISHI ELECTRIC CORP
发明人： KOMATSU SHINJI , SANO KAZUHIRO , SEYA MINORU , WACHI ISAO , MAEDA TAKAFUMI , MATSUDA SHUNICHI , OGAWARA KENJI , SEKIGUCHI KATSUHIKO , NAGASAKI HIROMI , MATSUNAGA KANZO
IPC分类号： H02H3/02 , G06F3/033 , G06F3/041 , H02H3/05
摘要： PURPOSE:To improve the operability by employing a flat display as a setting display panel. CONSTITUTION:A switchboard 1 comprises a protective relay section 2 comprising a digital unit contained therein, a setting display panel 3 mounted on the surface, a flat display 4 provided at a part thereof, and an operational mechanism 5 for controlling the operation thereof. The flat display employs an electroluminescence mechanism or a liquid crystal. The setting display panel 3 has the length and width of about 30cm and the depth of 4-5cm whereas the flat display 4 has the length of about 15cm, the width of about 25cm and the thickness of about 1cm and provided with a touch operation function. This constitution allows interactive setting operation through the flat display thus enhancing the workability and the function.

9. 发明专利

JPH0246127A SYMMETRIC COMPONENT PROTECTIVE RELAY 失效
公开(公告)号：JPH0246127A
公开(公告)日：1990-02-15
申请号：JP19463388
申请日：1988-08-05
申请人： HITACHI LTD , TOKYO ELECTRIC POWER CO
发明人： SANO KAZUHIRO , MATSUI YOSHIAKI , FUJII DAISUKE , OURA YOSHIFUMI , YOSHIDA AKIRA , MAEDA TAKAFUMI
IPC分类号： H02H3/34
摘要： PURPOSE:To improve fault detection sensibility and fault selection reliability by employing reverse phase current and zero phase current as signals for judging fault in a power system. CONSTITUTION:Phase currents Ia, Ib, Ic are fed from a power source 1 to an AD converter 7 and analog values are sampled at same time point (t). Then reverse phase filters 8-11 calculate symmetric component signals of phase currents, i.e., reverse phase currents. A zero phase filter 11 calculates a zero phase current. Thereafter, an a phase (a) judging section 12 judges phase between phase (a) reverse current I2a(t) and zero phase current I0(t), a phase (b) judging section 13 judges phase between phase (b) reverse current I2b(t) and zero phase current I0(t) and phase (c) judging section judges phase between phase (c) reverse current I2c(t) and zero phase current I0(t). The phase judging sections 12-14 judges a phase to be faulty it two input signals are in-phase.

10. 发明专利

JPH01227547A DATA COMMUNICATION SYSTEM 失效
公开(公告)号：JPH01227547A
公开(公告)日：1989-09-11
申请号：JP5325188
申请日：1988-03-07
申请人： TOKYO ELECTRIC POWER CO , HITACHI LTD , TOSHIBA CORP , MITSUBISHI ELECTRIC CORP
发明人： MATSUMOTO TADAO , OHASHI NOBUFUMI , SANO KAZUHIRO , KANO TATSUYA , TERAO YASUHIKO
IPC分类号： H04L12/40
摘要： PURPOSE:To prevent the lowering of a data transmission efficiency due to transmission control information at the time of dividing a frame by sending collectively data having a long updating period sent from one and the same station. CONSTITUTION:A synchronizing data frame is transmitted from a main station to a slave station at every fixed transmission frequency, a counter is set at a value common to all stations on a network according to a counter setting command flag at each slave station, the counter is made to advance for each token pass, the the data frame is sent only when the value of the counter is made equal to the address value of its own station. In such a way, for the station to send even the data having the long updating period, control is executed so as to sent the data only in a cycle balanced to the updating period, and the data having the long updating period are transmitted collectively. Thus, the transmission efficiency can be improved.

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