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21. 发明专利

JPH0618589A SHORT-CIRCUIT TESTING DEVICE FOR ELECTRICAL POWER EQUIPMENT 失效
公开(公告)号：JPH0618589A
公开(公告)日：1994-01-25
申请号：JP17264292
申请日：1992-06-30
申请人： MEIDENSHA ELECTRIC MFG CO LTD
发明人： CHIYOU TERUMICHI , MATSUNAMI TAKAKAZU , SHIOZAKI MITSUYASU , ONOMOTO SHIYUUJI
IPC分类号： G01R31/00 , G01R31/327 , G01R31/333 , G05B13/00 , G01R31/32
摘要： PURPOSE:To reduce the burden of testers and, at the same time, to improve the testing efficiency at the time of performing short-circuit tests on electrical power equipment. CONSTITUTION:A computer section 1 sets and selects test conditions on an interactive basis against a circuit breaker control section 2 having a circuit breaker for constituting connection of a generator which becomes a power source at the time of performing short-circuit tests on power equipment, etc., and test sequence control section 3 having a timer for test sequence. The control of the circuit breaker and setting of the timer are automatically performed in accordance with the test conditions.

22. 发明专利

JPH05188122A METHOD FOR TESTING BREAKER 失效
公开(公告)号：JPH05188122A
公开(公告)日：1993-07-30
申请号：JP346092
申请日：1992-01-13
申请人： MEIDENSHA ELECTRIC MFG CO LTD
发明人： MATSUNAMI TAKAKAZU , CHIYOU KITSUU , ONOMOTO SHIYUUJI , SHIOZAKI MITSUYASU
IPC分类号： G01R31/327 , G01R31/333
摘要： PURPOSE:To allow test items due to insufficient short-circuit capacity to be tested without increasing a short-circuit generator capacity. CONSTITUTION:An overexcitation circuit (SW1 circuit) and a deexcitation circuit (SW2 circuit) are added to an excitation circuit of a short-circuit generator AG, wherein attenuation of short-circuit current is suppressed to maintain it at an almost constant value with the short-circuit generator AG overexcited (SW1 ON) immediately before a start point of short-circuit current application of a breaker CB1 to be tested. Immediately before and after completion of the shutdown of the tested breaker CB1, overexcitation is turned off to apply deexcitation for a short time SW1 OFF, SW2 ON for a short time (0.1sec)) so that influence by the overexcitation is canceled to put transition recovery voltage and recovery voltage within an allowable range.

23. 发明专利

JPH0534421A METHOD OF SHORT-CIRCUIT TEST FOR CIRCUIT BREAKER 失效
公开(公告)号：JPH0534421A
公开(公告)日：1993-02-09
申请号：JP19174691
申请日：1991-07-31
申请人： MEIDENSHA ELECTRIC MFG CO LTD
发明人： SHIOZAKI MITSUYASU , ONOMOTO SHIYUUJI , ARAKAWA SHUNICHI , MATSUNAMI TAKAKAZU , CHIYOU TERUMICHI
IPC分类号： G01R31/327 , G01R31/333
摘要： PURPOSE:To adapt interrupting current and making current to respective standards at the operating duty 'O'-theta-'CO' of the short-circuit test of a circuit breaker. CONSTITUTION:For the test of an operating duty 'O'-theta-'CO' performed by a circuit-breaker testing device, a circuit breaker CBT to be tested is connected to a short-circuit power generator AG via a current-limiting reactor L1 for regulating short-circuit current and via a switch SW1, and a current-limiting reactor L2 for restraining making current and a switch SW2 for shortcircuiting the reactor are provided within the current path of the circuit breaker CBT. While the reactor-shortcircuiting switch SW2 is closed the circuit is opened at some point during the non-voltage time theta of the operating duty 'O'-theta-'CO' and then closed at some point during 'CO' in which the breaker is put in breaking action after making action.

24. 发明专利

JPH02210282A BREAKING TEST DEVICE FOR LEADING CURRENT OF SWITCHING DEVICE 失效
公开(公告)号：JPH02210282A
公开(公告)日：1990-08-21
申请号：JP3212489
申请日：1989-02-10
申请人： MEIDENSHA ELECTRIC MFG CO LTD
发明人： IKEMOTO KUNIO , ARAKAWA SHUNICHI , ONOMOTO SHIYUUJI , MATSUNAMI TAKAKAZU , SHIOZAKI MITSUYASU , MATSUI YOSHIHIKO
IPC分类号： G01R31/327 , G01R31/333
摘要： PURPOSE:To perform an equivalent test conformable to an actual system by connecting two parallel resonance circuits having an equivalent resonance frequency in series and also short-circuiting one of them with the closing of switch at the point of time after a current is interrupted. CONSTITUTION:When the current is interrupted at the time t0 by opening a breaker 2 to be tested in the condition that a switch 7 of the parallel resonance circuit 6 is opened, a voltage of 1.5E (E is a peak voltage value of power supply 1) is made to remain in a capacitor 3 for remaining the voltage. The parallel resonance circuits 5,6 are oscillated with a single frequency f0, and a voltage between the poles of breaker 2 is made to be es-el=3/2E(1-cosomega0t), (omega0 is an angular velocity expressed as omega0=2pif). At this time, when the switch 7 is closed at the time t1 corresponding to the interrupting points for the 2nd and 3rd phases, the voltage generated between both ends of the circuit 6 is made to be zero. Since the electrostatic capacity ratio of capacitors 51, 61 is 2:1, the voltage between the poles of breaker 2 is made to be E{3/2-sin(omega0t-pi)}. This relation shows the voltage between the poles at the time when the leading current is interrupted in a non-grounding system, then the voltage waveform at the 1st phase interrupting time in a 3-phase circuit can be simulated by a single phase circuit.

25. 发明专利

JPS6449987A THREE-PHASE SHORT-CIRCUIT TESTING METHOD 失效
公开(公告)号：JPS6449987A
公开(公告)日：1989-02-27
申请号：JP20592987
申请日：1987-08-19
申请人： MEIDENSHA ELECTRIC MFG CO LTD
发明人： FUKUDA SHIGEHIKO , ARAKAWA SHUNICHI , MATSUNAMI TAKAKAZU , ONOMOTO SHIYUUJI , SHIOZAKI MITSUYASU
IPC分类号： G01R31/327 , G01R31/333
摘要： PURPOSE:To apply no excessive stress to a breaker to be tested by turning on turning-on devices having either of two phases among three phases almost at the crest value of the line voltage between the two phases, turning on the remaining device of one phase several ms later, and suppressing the making current crest value. CONSTITUTION:When a short-circuit test is conducted, the turning-on devices 89 of the U and V phases are turned on at a U-phase and a V-phase turning-on point (where the U-V line voltage reaches the crest value). A two-phase circuit is formed by the turning on the U phase and V phase. Then when the W phase is 5ms delayed by a timer, etc., and turned on, so that the U-V line voltage falls to the zero point. Then the W-phase current reaches the crest value. Consequently, the crest value of the W-phase current is suppressed and currents E/Z flow to the respective phases. Consequently, no excessive stress if applied to the breaker.

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