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1. 发明专利

JPH06260308A NEUTRAL-POINT GROUND APPARATUS 失效
公开(公告)号：JPH06260308A
公开(公告)日：1994-09-16
申请号：JP4342593
申请日：1993-03-04
申请人： HITACHI LTD , CHUBU ELECTRIC POWER
发明人： ARITA HIROSHI , KIDA JUNZO , KUROSAWA YUKIO , YAMAGIWA TOKIO , MORITA MASAO , UEDA TOSHIAKI
IPC分类号： H01C13/00 , H02H3/34 , H02H9/08
摘要： PURPOSE:To provide a neutral-point grounding apparatus, wherein the detecting sensitivity of a grounding relay is improved in the line-to-ground fault of a transmission system. CONSTITUTION:Low-value resistors 401, 401, 403,..., 419 and 420 are connected between a neutral point N in a transmission system and the ground in series. The group of switches 501-520, which are connected to the respective resistors in parallel and can be turned ON/OFF at a high speed, is provided. The switches 501-502 forming the group are switched and controlled in response to the magnitudes of the neutral-point voltage and the neutral-point current at the neutral point N with a controller, which is not shown in the figure.

2. 发明专利

JPH06233459A POWER SYSTEM PROTECTIVE SYSTEM 失效
公开(公告)号：JPH06233459A
公开(公告)日：1994-08-19
申请号：JP1843693
申请日：1993-02-05
申请人： HITACHI LTD , CHUBU ELECTRIC POWER
发明人： KIDA JUNZO , ARITA HIROSHI , KUROSAWA YUKIO , YAMAGIWA TOKIO , MORITA MASAO , UEDA TOSHIAKI
IPC分类号： H02H9/02 , H02J3/04
摘要： PURPOSE:To improve the quality of power supplied by suppressing an overcurrent flowing together with a short-circuited current due to a cause other than short-circuit. CONSTITUTION:For example, a short-circuit failure has occurred at a customer located at a lower position of a power distribution system 6b, an overcurrent suppressing equipment 1b detects a short-circuit current by the overcurrent detecting function possessed by an overcurrent suppressing device 1b and suppresses the short-circuit current. On the other hand, if the cause is other than the short-circuit, an overcurrent suppressing control is performed by giving switching information 7 about a circuit breaker 2 and so forth to be switched to the overcurrent suppressing device 1b. And after the switching operation by the circuit breaker 2, the overcurrent suppressing function of the overcurrent suppressing equipment 1b is made invalid after the elapse of time in which overcurrent will cease, and a load current is applied. By doing this, the voltage fluctuations of power system can be suppressed and high quality power can be supplied.

3. 发明专利

JPH04112619A DISTRIBUTION LINE INTERRUPTING METHOD, INTERRUPTER AND USING METHOD THEREOF 失效
公开(公告)号：JPH04112619A
公开(公告)日：1992-04-14
申请号：JP23270990
申请日：1990-09-03
申请人： HITACHI LTD , CHUBU ELECTRIC POWER
发明人： MORITA MASAO , UEDA TOSHIAKI , KUROSAWA YUKIO , ARITA HIROSHI , YAMAGIWA TOKIO
IPC分类号： H02H9/02 , F02B75/02 , H02H3/02 , H02H7/30
摘要： PURPOSE:To improve reliability by setting the limiting current of a current limiting element in a current limiting circuit higher than the operating current of an instantaneous element in an overcurrent relay for operating a downstream power system protective unit connected with a power line. CONSTITUTION:Main circuit comprises a series circuit of a circuit breaker 1 and a series switch 2. A current limit impedance 4 is then connected in parallel with the circuit breaker 1 to form a current limit circuit. A current detector 7 detects a load current flowing through the main circuit or the current limit circuit and feeds the detected load current I to first and second overcurrent detectors 8, 9, respectively. When the load current I exceeds a first set value I1, the first overcurrent detector 8 provides an interruption command to the circuit breaker 1. When the load current I exceeds a second set value I2 for longer-than a predetermined time, the second overcurrent detector 9 provides an open command to the series switch 2.

4. 发明专利

JPH07322487A GROUNDING CURRENT SUPPRESSION DEVICE AND METHOD 失效
公开(公告)号：JPH07322487A
公开(公告)日：1995-12-08
申请号：JP10553494
申请日：1994-05-19
申请人： HITACHI LTD , CHUBU ELECTRIC POWER
发明人： ARITA HIROSHI , KIDA JUNZO , MATSUI YOSHIAKI , YAMAGIWA TOKIO , SUGIMOTO SHIGEYUKI , NEO SADANORI
IPC分类号： H02H3/34 , H02H3/38 , H02H9/08
摘要： PURPOSE:To improve the reliability in the protection system of a current system by detecting the presence or absence of the generation of a grounding failure according to a detection value detected by the current detection means of a power distribution line and by changing the amount of reactor on the basis of the detection. CONSTITUTION:When No.1 grounding failure occurs at a power distribution line 5a, current flowing through a ground electrostatic capacity 8a of the failure line 5a, current flowing through a ground electrostatic capacity 8b of a sound line 5b, current flowing through a transformer 6 for a ground type measuring instrument, and a current ILn flowing to a grounding current compensation device 10 are available as IF components of a grounding current l l. The grounding current compensation device 10 inserts a reactor content equivalent to an approximate electrostatic capacity compensation from the beginning, calculates the amount of reactor compensation from a zero-phase voltage and a zero-phase voltage when a failure occurs using a controller, and speedily vary ILn by adjusting the amount of compensation, thus suppressing grounding current more precisely and improving the reliability in a power protection system.

5. 发明专利

JPH06233452A CURRENT LIMITING DEVICE AND CURRENT LIMITING CONTROL METHOD 失效
公开(公告)号：JPH06233452A
公开(公告)日：1994-08-19
申请号：JP1843493
申请日：1993-02-05
申请人： HITACHI LTD , CHUBU ELECTRIC POWER
发明人： KIDA JUNZO , ARITA HIROSHI , KUROSAWA YUKIO , YAMAGIWA TOKIO , MORITA MASAO , SUGIMOTO SHIGEYUKI , UEDA TOSHIAKI
IPC分类号： G05F1/70 , H02H9/02 , H02J3/24
摘要： PURPOSE:To make it possible to suppress a fault current in a series capacitor compensation system. CONSTITUTION:A reactance compensating series capacitor 11 is connected in series to a reactor 12 in an electric power transmission and distribution line 2 shown in Fig. 1, and a protection device 23 for protecting the capacitor from an overvoltage by short-circuiting the terminals of the capacitor after occurrence of a fault is provided, a combined reactance of the series capacitor 11 and the reactor 12 is capacitive, the reactance of the power transmission and distribution line 2 is compensated at normal time, and a current is limited after the occurrence of a fault by short-circuiting the terminals of the capacitor 11 by means of the overvoltage protection device 13 of the capacitor and by allowing a fault current to flow through the reactor 12. By doing this, the fault current can be suppressed while increasing the power transmission capacity of the system and compensating the series capacitor capable of improving the stability and voltage stability.

6. 发明专利

JP2006038408A Storage type water heater 有权
标题翻译：储存式水加热器
公开(公告)号：JP2006038408A
公开(公告)日：2006-02-09
申请号：JP2004222724
申请日：2004-07-30
申请人： Chubu Electric Power Co Inc , Hitachi Air Conditioning System Co Ltd , 中部電力株式会社 , 株式会社日立空調システム
发明人： ARITA HIROSHI , KURAMOTO SHINJI , FUJITA HIDEKATSU , YOKOYAMA TAKUYA , SHIMURA KINICHI
IPC分类号： F24H1/18
摘要： PROBLEM TO BE SOLVED: To provide a storage type water heater that can heat a periphery of a heat exchanger in a short time by transferring heat of an external heating circuit to an indirect heating circuit, always take out hot water, and allow a long-time heating operation or the like. SOLUTION: The water heater comprises a circuit 2 for heating that has a heat exchanger 21 over a hot-water storage tank 1 and performs heating, a circuit 3 for reheating that has a heat exchanger 31 over the hot-water storage tank 1 and performs reheating of a bath, and an external heating circuit 4 that takes out the hot water in the hot-water storage tank 1 to the outside, heats it, and returns it to the hot-water storage tank 1. An auxiliary heat exchanger 5 for performing heat exchange between fluids flowing in pipes 16a and 23a is disposed between the pipe 16a on the downstream side of a heating section 15a of the external heating circuit 4 and the pipe 23a on the downstream side of a loading 11 of the circuit 2 for heating. COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：为了提供一种能够在短时间内通过将外部加热回路的热量传递到间接加热回路来加热热交换器的周围的储存式热水器，总是取出热水，并允许长时间加热操作等。解决方案：热水器包括一个用于加热的电路2，该电路在热水储存箱1的上方具有一个热交换器21，并进行加热，一个再加热回路3，该热交换器31在热水储存罐 1并进行浴的再加热，以及外部加热回路4，其将热水储存箱1内的热水取出到外部，加热，并将其返回到热水储存箱1.辅助热在外部加热回路4的加热部15a的下游侧的配管16a与电路的负载11的下游侧的配管23a之间配置用于在管16a，23a中流动的流体之间进行热交换的交换器5 2加热。版权所有（C）2006，JPO＆NCIPI

7. 发明专利

JP2004096871A Linkage protection system for distributed power supply equipment 审中-公开
公开(公告)号：JP2004096871A
公开(公告)日：2004-03-25
申请号：JP2002253336
申请日：2002-08-30
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： UCHIYAMA TOMOYUKI , ONO YASUNORI , ARITA HIROSHI , HIGUCHI MIKISUKE , KAWAMURA NAOTERU
IPC分类号： H02J3/38
摘要： PROBLEM TO BE SOLVED: To provide a linkage protection system for distributed power supply equipment capable of performing smooth arithmetic processing. SOLUTION: A circuit breaker 12 for bus-bar communication is inserted into a bus bar 16 which connects between a power system 4 and distributed power supply equipment 5. A passing current I is detected by a current detector 13. A voltage on the power system side is detected by a voltage detector 14. The voltage on the distributed power supply equipment side is detected by a voltage detector 15. The detected current and each detected voltage are fetched into a control device 11. In the control device 11, a momentary voltage drop is detected by a combination of overcurrent or a current variation rate and a voltage drop, and a single run is detected according to a frequency variation rate of the voltage on the distributed power supply side. It is determined whether the direction of the power in the bus bar 16 is a direction from the distributed power supply equipment 5 side to the power system 4 side. The circuit breaker 12 is opened by outputting an interrupting instruction from the control device 11 to the circuit breaker 12 for the bus-bar connection, when the condition of a logic product between the positive determination result and the momentary voltage drop is satisfied or when the single run is detected. COPYRIGHT: (C)2004,JPO

8. 发明专利

JP2002242694A ENERGY STORING TYPE GAS TURBINE GENERATOR 失效
公开(公告)号：JP2002242694A
公开(公告)日：2002-08-28
申请号：JP2001043151
申请日：2001-02-20
申请人： HITACHI LTD
发明人： MOMO SATOSHI , TSUBOUCHI KUNIYOSHI , YOKOMIZO OSAMU , CHINO KOICHI , NAKAHARA MITSUGI , AKATSU YASUAKI , YASUGADAIRA NORIO , ARITA HIROSHI , YAGI MANABU
IPC分类号： F02C6/16 , F02C1/04 , F02C7/12 , F23R3/40 , H02P9/04
摘要： PROBLEM TO BE SOLVED: To provide a more efficient energy storing type gas turbine generating set. SOLUTION: This energy storing type gas turbine generator comprises a compressor 4 for pressurizing air; a motor 5 for driving the compressor 4; a tank 10 for storing a liquid air produced by compression by the compressor 4; a cold storage tank 8 for sending stored air by pressure; a combustor 18 for heating the air sent by pressure; a gas turbine 23 rotated by heated air; and a generator 24 driven by the turbine 23. The motor 5 and the generator 24 are independently placed. The compressor 4 is driven by using excess electric power, and stores pressurized air. When electric power demand increases, a high pressure high temperature air is supplied to the gas turbine 23 by using the stored air to generate the electric power.

9. 发明专利

JP2002058159A METHOD AND SYSTEM FOR SUPPLYING POWER 失效
公开(公告)号：JP2002058159A
公开(公告)日：2002-02-22
申请号：JP2000241142
申请日：2000-08-09
申请人： HITACHI LTD
发明人： ONO YASUNORI , UCHIYAMA TOMOYUKI , UMEGAKI KIKUO , ARITA HIROSHI , KANAI MINORU
IPC分类号： H02J13/00 , H02J3/00
摘要： PROBLEM TO BE SOLVED: To provide a technique of supplying power to meet the customers' demands, in a way reducing the expense for the customers. SOLUTION: Information, such as the amount of power generated by the power generator 10 installed at the premises of customers 1, the amount of power received through a power transmission and distribution system 90, the amount of power transmitted to the system, and data on the quality of power is collected at a control center 70 through monitoring devices 30 and a communication means 60. The demands by the customers are estimated at the control center 70, to determine the operating conditions at the premises of the customers, and operations are conducted via the communication means. In addition, maintenance is conducted as required, and charge rates are calculated according to the amount of power used, and the quality of power based on the data on power and data on the quality of power and outputted.

10. 发明专利

JP2001123886A ELECTRIC POWER/HOT WATER FEEDING EQUIPMENT 失效
公开(公告)号：JP2001123886A
公开(公告)日：2001-05-08
申请号：JP30199599
申请日：1999-10-25
申请人： HITACHI LTD
发明人： MOMO SATOSHI , AKATSU YASUAKI , ARITA HIROSHI , TSUBOUCHI KUNIYOSHI , YOKOMIZO OSAMU
IPC分类号： F02G5/04 , F24H1/00
摘要： PROBLEM TO BE SOLVED: To improve a private power generation ratio even with respect to a high load fluctuation where a ratio between a maximum load and an average load exceeds three times and correspond to reheating of hot water fed once, in private power generation equipment and a hot water feeding device through power generating by an internal combustion engine and hot-water supply by an exhaust heat. SOLUTION: An air compressor is connected to the output shaft end of a prime mover via a shaft coupling device to effect connection and disconnection and a means is provided to store manufactured compressed air. Furthermore, manufactured and stored compressed air is used as supercharging or feed air to a combustor and increases a prime mover output or increases heat input to a exhaust heat recovery part, in correspondence to a peak demand. Thus, a private power generation ratio is increased without situating excessive power storage equipment. Furthermore, power/hot water feed equipment corresponding to a low capacity prime mover is constituted also for a customer who has a high peak demand.

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