CN103454582A - Detection device for broken-down electric arcs of breaker - Google Patents
Detection device for broken-down electric arcs of breaker Download PDFInfo
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- CN103454582A CN103454582A CN2013103930883A CN201310393088A CN103454582A CN 103454582 A CN103454582 A CN 103454582A CN 2013103930883 A CN2013103930883 A CN 2013103930883A CN 201310393088 A CN201310393088 A CN 201310393088A CN 103454582 A CN103454582 A CN 103454582A
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Abstract
The invention belongs to power transmission and transformation detection equipment in the power industry, and particularly relates to a detection device for broken-down electric arcs of a breaker. The detection device for the broken-down electric arcs of the breaker comprises a power source circuit (8), an LED indicating circuit (9), an A/D switching circuit (2) and a current signal conditioning circuit (6). The detection device for the broken-down electric arcs of the breaker is characterized by further comprising a control circuit (1), a broken-down electric arc detection circuit (4), a zero-sequence current detection circuit (3), a releasing control circuit (10), a synchronizing signal conditioning circuit (7), a synchronizing voltage detection circuit (5) and a wave shaping circuit (11). The control circuit (1) comprises a central processing unit U1, a programmatic interface ISP, a crystal oscillator Y, a diode D5, a resistor R7, capacitors C1-C3 and a key S. The whole detection device is safe, reliable and accurate in data detection, ensures stable operation of power, avoids accidents and reduces economic losses.
Description
Technical field
The invention belongs to power industry power transmission and transformation checkout equipment, particularly a kind of circuit breaker failure electric arc detecting device.
Background technology
At present, circuit breaker failure arc-detection in the power transmission and transforming equipment of the power industry of China is all that the current value by single circuit judges whether to produce electric arc, realize threading off and control, for different loads, difference due to working current, fault that can not intelligent decision electric arc, thus the misoperation phenomenon produced, to enterprise, produce and the people's life is made troubles and massive losses.
Summary of the invention
The object of the invention is to overcome above-mentioned technical deficiency, providing a kind of can detect in real time to fault electric arc, accurately judgement, safe and reliable circuit breaker failure electric arc detecting device.
The technical scheme that technical solution problem of the present invention adopts is: the circuit breaker failure electric arc detecting device comprises power circuit, the LED indicating circuit, the A/D change-over circuit, current signal conditioning circuit, be characterized in device also being provided with control circuit, the fault electric arc testing circuit, circuit measuring zero phase sequence current, the dropout control circuit, the synchronizing signal modulate circuit, synchronizing voltage testing circuit and waveform shaping circuit, wherein control circuit comprises: central processing unit U1, DLL (dynamic link library) ISP, crystal resonator Y, diode D5, resistance R 7, capacitor C 1 ~ C3, button S, their annexation is: 2 pin of central processing unit U1, 3 pin, 11 pin connect respectively 1 pin of DLL (dynamic link library) ISP, 9 pin, 7 pin, 12 ~ 17 pin of central processing unit U1, 44 ~ 51 pin all connect 9 ~ 16 pin of A/D converter U2 in the A/D change-over circuit by bus N, 19 ~ 24 pin, 20 pin of central processing unit U1 meet diode D5, one end of capacitor C 1, 5 pin of DLL (dynamic link library) ISP, the end of the other end connecting resistance R7 of diode D5 and+the 5V power supply, the end of capacitor C 1 another termination button S and ground, button S, resistance R 7 other ends join, 23 of central processing unit U1, 24 pin connect respectively the two ends of crystal resonator Y, capacitor C 2, the end of C3, capacitor C 2, an end ground connection in C3, 2 pin of wave shaping chip U3 in the 25 pin welding wave shaping circuits of central processing unit U1, 35 ~ 38 pin of central processing unit U1 connect respectively the end of resistance R 4 ~ R1 in the LED indicating circuit, central processing unit U1 42 pin connect an end of resistance R 8 in de-mouthful of control circuit, central processing unit U1 21, connect+5V of 52 pin power supply, central processing unit U1 22, 53, 63 pin ground connection, central processing unit U1 34 pin meet 27 of A/D converter U2 in the A/D change-over circuit, 28 pin, 43 pin of U1 connect 30 pin of U2, connect+5V of the 2 pin power supply of DLL (dynamic link library) ISP, 8 pin of DLL (dynamic link library) ISP, 10 pin ground connection, the fault electric arc testing circuit comprises: current transformer L1 ~ L3, three-phase supply A, B, C, power pack T2 ~ T4, diode D7 ~ D9, their annexation is: 1,2 pin of power pack T2 ~ T4 connect respectively 1,2 pin of current transformer L1 ~ L3, current transformer L2 ~ L4 connects respectively three-phase supply A, B, C, 3 pin of power pack T2 ~ T4 connect respectively the end of diode D7 ~ D9, the other end of diode D7, D8 connects respectively 3 pin of operational amplifier U6A, U5A in current signal conditioning circuit, 10 pin of operational amplifier U5C in another termination synchronizing signal modulate circuit of diode D9, the 4 pin ground connection of power pack T2 ~ T4, circuit measuring zero phase sequence current comprises zero sequence current mutual inductor LC1, zero-sequence current transducer T5, three-phase supply A, B, C, diode D10, their annexation is: 1,2 pin of zero sequence current mutual inductor LC1 connect 1,2 pin of three-phase supply A, B, C phase and zero-sequence current transducer T5,3 pin of zero-sequence current transducer T5 connect the end of diode D10,10 pin of operational amplifier U7C in another termination synchronizing signal modulate circuit of diode D10, the 4 pin ground connection of zero-sequence current transducer T5, the synchronizing voltage testing circuit comprises three-phase supply A, B, C, voltage transformer (VT) T1, diode D6, their annexation is: 1,2 pin of voltage transformer (VT) T1 connect respectively A, the B phase of three-phase supply, 3 pin of voltage transformer (VT) T1 connect the end of diode D6,10 pin of operational amplifier U6C in another termination synchronizing signal modulate circuit of diode D6, the 4 pin ground connection of voltage transformer (VT) T1, the synchronizing signal modulate circuit comprises operational amplifier U5C ~ U7C, U5D ~ U7D, resistance R 15 ~ R23, their annexation is: 4 pin of operational amplifier U5C ~ U7C, connect-5V of 11 pin power supply, 9 pin of U5C ~ U7C connect respectively 8 pin and the resistance R 18 of U5C ~ U7C, R15, the end of R21, 12 pin of operational amplifier U5D ~ U7D are connecting resistance R18 respectively, R15, the other end of D21, operational amplifier U6D, U5D, 13 pin of U7D are connecting resistance R16 respectively, R19, the end of R22, resistance R 16, R19, the other end of R22 meets respectively R17, R20, the end of R23 and ground, resistance R 20, the R23 other end connects respectively 32 pin of the A/D converter U2 in the A/D change-over circuit, 2 pin, operational amplifier U5D, 14 pin of U7D, 2 pin of operational amplifier U4A in the other end welding wave shaping circuit of resistance R 17, operational amplifier U5C ~ U7C, 4 pin of U5D ~ U7D and all connect-5V of 11 pin power supply, the dropout control circuit comprises photoelectrical coupler U8, triode Q, K switch, resistance R 8, connection terminal J2, their annexation is the other end of the 1 pin connecting resistance R8 of photoelectrical coupler U8,2, the 4 pin ground connection of photoelectrical coupler U8,3 pin of photoelectrical coupler U8 connect the base stage of triode Q, connect+24V of the collector of triode Q power supply, the emitter of triode Q connects 1 pin of K switch, 2 pin ground connection of K switch, 3 pin of K switch connect 1,2 pin of connection terminal J2, waveform shaping circuit comprises wave shaping chip U3, operational amplifier U4A, resistance R 5, R6, their annexation is that 1 pin of wave shaping chip U3 connects 1 pin of operational amplifier U4A, an end of resistance R 6, another termination of resistance R 6+5V power supply, the end of the 3 pin connecting resistance R5 of operational amplifier U4A, resistance R 5 other end ground connection, 4,8 connect+5V of the pin power supplys of operational amplifier U4A, 7 pin of wave shaping chip U3 and 14 pin respectively ground connection and+the 5V power supply.
The invention has the beneficial effects as follows: the method that the circuit breaker failure electric arc detecting device adopts three-phase to detect simultaneously, fault electric arc is detected in real time, transfer to central processing unit by the A/D change-over circuit, realize that by software the numerical value that numerical value and circuit measuring zero phase sequence current to the fault electric arc testing circuit detect compares at control circuit, the accurate judgement of realization to fault electric arc, the synchronizing voltage testing circuit is for detection of the zero point of circuit-under-test, whole pick-up unit is safe and reliable, the detection data are accurate, the assurance operation power is steady, avoid accident, reduce economic loss.
The accompanying drawing explanation
Below in conjunction with accompanying drawing, with embodiment, illustrate.
Fig. 1 is the structure annexation block diagram of circuit breaker failure electric arc detecting device.
Fig. 2 is the circuit theory diagrams of control circuit 1 in Fig. 1, power circuit 8, LED indicating circuit 9, dropout control circuit 10, waveform shaping circuit 11.
Fig. 3 is the circuit theory diagrams of A/D change-over circuit 2 in Fig. 1, circuit measuring zero phase sequence current 3, fault electric arc testing circuit 4, synchronizing voltage testing circuit 5, current signal conditioning circuit 6, synchronizing signal modulate circuit 7.
Embodiment
Embodiment, with reference to accompanying drawing 1, the unidirectional output of control circuit 1 in the circuit breaker failure electric arc detecting device connects dropout control circuit 10 and LED indicating circuit 9, fault electric arc testing circuit 4, the unidirectional output of circuit measuring zero phase sequence current 3 connect current signal conditioning circuit 6, the unidirectional output of current signal conditioning circuit 6 connects A/D change-over circuit 2, the unidirectional output of A/D change-over circuit 2 connects control circuit 1, and the unidirectional output of power circuit 8 connects control circuit 1; The unidirectional output of waveform shaping circuit 11 connects synchronizing voltage testing circuit 5, and the unidirectional output of synchronizing voltage testing circuit 5 connects synchronizing signal modulate circuit 7, the unidirectional output of synchronizing signal modulate circuit 7 connects control circuit 1.With reference to accompanying drawing 2, 3, the control circuit 1 in the circuit theory diagrams of circuit breaker failure electric arc detecting device comprises central processing unit U1, DLL (dynamic link library) ISP, crystal resonator Y, diode D5, resistance R 7, capacitor C 1 ~ C3, button S, their annexation is: 2 pin of central processing unit U1, 3 pin, 11 pin connect respectively 1 pin of DLL (dynamic link library) ISP, 9 pin, 7 pin, 12 ~ 17 pin of central processing unit U1, 44 ~ 51 pin all connect 9 ~ 16 pin of A/D converter U2 in the A/D change-over circuit by bus N, 19 ~ 24 pin, 20 pin of central processing unit U1 meet diode D5, one end of capacitor C 1, 5 pin of DLL (dynamic link library) ISP, the end of the other end connecting resistance R7 of diode D5 and+the 5V power supply, the end of capacitor C 1 another termination button S and ground, button S, resistance R 7 other ends join, 23 of central processing unit U1, 24 pin connect respectively the two ends of crystal resonator Y, capacitor C 2, the end of C3, capacitor C 2, an end ground connection in C3, 2 pin of wave shaping chip U3 in the 25 pin welding wave shaping circuits of central processing unit U1, 35 ~ 38 pin of central processing unit U1 connect respectively the end of resistance R 4 ~ R1 in the LED indicating circuit, central processing unit U1 42 pin connect an end of resistance R 8 in de-mouthful of control circuit, central processing unit U1 21, connect+5V of 52 pin power supply, central processing unit U1 22, 53, 63 pin ground connection, central processing unit U1 34 pin meet 27 of A/D converter U2 in the A/D change-over circuit, 28 pin, 43 pin of U1 connect 30 pin of U2, connect+5V of the 2 pin power supply of DLL (dynamic link library) ISP, 8 pin of DLL (dynamic link library) ISP, 10 pin ground connection,
A/D change-over circuit 2 comprises A/D converter U2, active crystal oscillator X, capacitor C 4, C5, C7, C8, C9, electrochemical capacitor C6, resistance R 24, their relation is 1 pin of A/D converter U2, 3 pin, 18 pin, 26 pin, 29 pin, 33 pin, 35 pin and 36 pin ground connection, 4 pin of A/D converter U2 connect 7 pin of the operational amplifier U6B in current signal conditioning circuit 6, one end of resistance R 11,5 of A/D converter U2, 6 pin connect respectively capacitor C 4, the end of C5, one termination of capacitor C 4-5V power supply, capacitor C 4, the C5 other end joins and connects the positive pole of electrochemical capacitor C6, one end of capacitor C 7, 8 pin of A/D converter U2 and ground, capacitor C 7 other ends, the negative pole of electrochemical capacitor C6 connects 7 pin of A/D converter U2, 17 pin of A/D converter U2 connect an end and the ground of capacitor C 8, the end of the other end connecting resistance R24 of capacitor C 8, resistance R 24 other end ground connection, 34 pin of A/D converter U2 connect 7 pin of the operational amplifier U5B in current signal conditioning circuit 6, one end of resistance R 13,31 pin of A/D converter U2 connect capacitor C 9 an end and-the 5V power supply, capacitor C 9 other end ground connection, 25 pin of A/D converter U2 are connected to 3 pin of source crystal oscillator X, the 2 pin ground connection of active crystal oscillator X, connect-5V of the 4 pin power supply of active crystal oscillator X.Circuit measuring zero phase sequence current 3 comprises: zero sequence current mutual inductor LC1, zero-sequence current transducer T5, three-phase supply A, B, C, diode D10; Their annexation is: 1,2 pin of zero sequence current mutual inductor LC1 connect 1,2 pin of three-phase supply A, B, C phase and zero-sequence current transducer T5,3 pin of zero-sequence current transducer T5 connect the end of diode D10,10 pin of operational amplifier U7C in another termination synchronizing signal modulate circuit of diode D10, the 4 pin ground connection of zero-sequence current transducer T5;
Fault electric arc testing circuit 4 comprises current transformer L1 ~ L3, three-phase supply A, B, C, power pack T2 ~ T4, diode D7 ~ D9; Their annexation is: 1,2 pin of power pack T2 ~ T4 connect respectively 1,2 pin of current transformer L1 ~ L3, current transformer L2 ~ L4 connects respectively three-phase supply A, B, C, 3 pin of power pack T2 ~ T4 connect respectively the end of diode D7 ~ D9, the other end of diode D7, D8 connects respectively 3 pin of operational amplifier U6A, U5A in current signal conditioning circuit, 10 pin of operational amplifier U5C in another termination synchronizing signal modulate circuit of diode D9, the 4 pin ground connection of power pack T2 ~ T4;
Synchronizing voltage testing circuit 5 comprises three-phase supply A, B, C, voltage transformer (VT) T1, diode D6, their annexation is: 1,2 pin of voltage transformer (VT) T1 connect respectively A, the B phase of three-phase supply, 3 pin of voltage transformer (VT) T1 connect the end of diode D6,10 pin of operational amplifier U6C in another termination synchronizing signal modulate circuit of diode D6, the 4 pin ground connection of voltage transformer (VT) T1;
Current signal conditioning circuit 6 comprises: operational amplifier U5A, U6A, U5B, U6B, resistance R 9 ~ R14, their relation is: 2 pin of operational amplifier U5A connect an end of 1 pin and resistance R 14, 4 pin of U5A and connect-5V of 11 pin power supply, 5 pin of another termination operational amplifier U5B of resistance R 14, 4 pin of operational amplifier U5B, connect-5V of 11 pin power supply, the end of the 6 pin connecting resistance R12 of U5B, the other end ground connection of resistance R 12 and R13, 4 pin of operational amplifier U6A, connect-5V of 11 pin power supply, 2 pin of U6A connect an end of 1 pin and resistance R 9, 5 pin of another termination operational amplifier U6B of resistance R 9, 4 pin of U6B, connect-5V of 11 pin power supply, the end of the 6 pin connecting resistance R10 of U6B, an end ground connection in resistance R 10 and R11.
Synchronizing signal modulate circuit 7 comprises fortune operational amplifier U5C ~ U7C, U5D ~ U7D, resistance R 15 ~ R23, their annexation is: 4 pin of operational amplifier U5C ~ U7C, connect-5V of 11 pin power supply, 9 pin of U5C ~ U7C connect respectively 8 pin and the resistance R 18 of U5C ~ U7C, R15, the end of R21, 12 pin of operational amplifier U5D ~ U7D are connecting resistance R18 respectively, R15, the other end of D21, operational amplifier U6D, U5D, 13 pin of U7D are connecting resistance R16 respectively, R19, the end of R22, resistance R 16, R19, the other end of R22 meets respectively R17, R20, the end of R23 and ground, resistance R 20, the R23 other end connects respectively 32 pin of the A/D converter U2 in the A/D change-over circuit, 2 pin, operational amplifier U5D, 14 pin of U7D, 2 pin of operational amplifier U4A in the other end welding wave shaping circuit of resistance R 17, operational amplifier U5C ~ U7C, 4 pin of U5D ~ U7D and all connect-5V of 11 pin power supply,
Claims (1)
1. a circuit breaker failure electric arc detecting device, comprise power circuit (8), LED indicating circuit (9), A/D change-over circuit (2), current signal conditioning circuit (6), is characterized in that in device also being provided with control circuit (1), fault electric arc testing circuit (4), circuit measuring zero phase sequence current (3), dropout control circuit (10), synchronizing signal modulate circuit (7), synchronizing voltage testing circuit (5) and waveform shaping circuit (11), wherein control circuit (1) comprising: central processing unit U1, DLL (dynamic link library) ISP, crystal resonator Y, diode D5, resistance R 7, capacitor C 1 ~ C3, button S, their annexation is: 2 pin of central processing unit U1, 3 pin, 11 pin connect respectively 1 pin of DLL (dynamic link library) ISP, 9 pin, 7 pin, 12 ~ 17 pin of central processing unit U1, 44 ~ 51 pin all connect 9 ~ 16 pin of A/D converter U2 in A/D change-over circuit (2) by bus N, 19 ~ 24 pin, 20 pin of central processing unit U1 meet diode D5, one end of capacitor C 1, 5 pin of DLL (dynamic link library) ISP, the end of the other end connecting resistance R7 of diode D5 and+the 5V power supply, the end of capacitor C 1 another termination button S and ground, button S, resistance R 7 other ends join, 23 of central processing unit U1, 24 pin connect respectively the two ends of crystal resonator Y, capacitor C 2, the end of C3, capacitor C 2, an end ground connection in C3, 2 pin of wave shaping chip U3 in the 25 pin welding wave shaping circuits (12) of central processing unit U1, 35 ~ 38 pin of central processing unit U1 connect respectively the end of resistance R 4 ~ R1 in LED indicating circuit (9), central processing unit U1 42 pin connect an end of resistance R 8 in de-mouthful of control circuit (10), central processing unit U1 21, connect+5V of 52 pin power supply, central processing unit U1 22, 53, 63 pin ground connection, central processing unit U1 34 pin meet 27 of A/D converter U2 in A/D change-over circuit (2), 28 pin, 43 pin of U1 connect 30 pin of U2, connect+5V of the 2 pin power supply of DLL (dynamic link library) ISP, 8 pin of DLL (dynamic link library) ISP, 10 pin ground connection, fault electric arc testing circuit (4) comprising: current transformer L1 ~ L3, three-phase supply A, B, C, power pack T2 ~ T4, diode D7 ~ D9, their annexation is: 1,2 pin of power pack T2 ~ T4 connect respectively 1,2 pin of current transformer L1 ~ L3, current transformer L2 ~ L4 connects respectively three-phase supply A, B, C, 3 pin of power pack T2 ~ T4 connect respectively the end of diode D7 ~ D9, the other end of diode D7, D8 connects respectively 3 pin of operational amplifier U6A, U5A in current signal conditioning circuit (6), 10 pin of operational amplifier U5C in another termination synchronizing signal modulate circuit (7) of diode D9, the 4 pin ground connection of power pack T2 ~ T4, circuit measuring zero phase sequence current (3) comprises zero sequence current mutual inductor LC1, zero-sequence current transducer T5, three-phase supply A, B, C, diode D10, their annexation is: 1,2 pin of zero sequence current mutual inductor LC1 connect 1,2 pin of three-phase supply A, B, C phase and zero-sequence current transducer T5,3 pin of zero-sequence current transducer T5 connect the end of diode D10,10 pin of operational amplifier U7C in another termination synchronizing signal modulate circuit (7) of diode D10, the 4 pin ground connection of zero-sequence current transducer T5, synchronizing voltage testing circuit (5) comprises three-phase supply A, B, C, voltage transformer (VT) T1, diode D6, their annexation is: 1,2 pin of voltage transformer (VT) T1 connect respectively A, the B phase of three-phase supply, 3 pin of voltage transformer (VT) T1 connect the end of diode D6,10 pin of operational amplifier U6C in another termination synchronizing signal modulate circuit (7) of diode D6, the 4 pin ground connection of voltage transformer (VT) T1, synchronizing signal modulate circuit (7) comprises operational amplifier U5C ~ U7C, U5D ~ U7D, resistance R 15 ~ R23, their annexation is: 4 pin of operational amplifier U5C ~ U7C, connect-5V of 11 pin power supply, 9 pin of U5C ~ U7C connect respectively 8 pin and the resistance R 18 of U5C ~ U7C, R15, the end of R21, 12 pin of operational amplifier U5D ~ U7D are connecting resistance R18 respectively, R15, the other end of D21, operational amplifier U6D, U5D, 13 pin of U7D are connecting resistance R16 respectively, R19, the end of R22, resistance R 16, R19, the other end of R22 meets respectively R17, R20, the end of R23 and ground, resistance R 20, the R23 other end connects respectively 32 pin of the A/D converter U2 in A/D change-over circuit (2), 2 pin, operational amplifier U5D, 14 pin of U7D, 2 pin of operational amplifier U4A in the other end welding wave shaping circuit (11) of resistance R 17, operational amplifier U5C ~ U7C, 4 pin of U5D ~ U7D and all connect-5V of 11 pin power supply, dropout control circuit (10) comprises photoelectrical coupler U8, triode Q, K switch, resistance R 8, connection terminal J2, their annexation is the other end of the 1 pin connecting resistance R8 of photoelectrical coupler U8,2, the 4 pin ground connection of photoelectrical coupler U8,3 pin of photoelectrical coupler U8 connect the base stage of triode Q, connect+24V of the collector of triode Q power supply, the emitter of triode Q connects 1 pin of K switch, 2 pin ground connection of K switch, 3 pin of K switch connect 1,2 pin of connection terminal J2, waveform shaping circuit 11 comprises wave shaping chip U3, operational amplifier U4A, resistance R 5, R6, their annexation is that 1 pin of wave shaping chip U3 connects 1 pin of operational amplifier U4A, an end of resistance R 6, another termination of resistance R 6+5V power supply, the end of the 3 pin connecting resistance R5 of operational amplifier U4A, resistance R 5 other end ground connection, 4,8 connect+5V of the pin power supplys of operational amplifier U4A, 7 pin of wave shaping chip U3 and 14 pin respectively ground connection and+the 5V power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103930883A CN103454582A (en) | 2013-09-03 | 2013-09-03 | Detection device for broken-down electric arcs of breaker |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013103930883A CN103454582A (en) | 2013-09-03 | 2013-09-03 | Detection device for broken-down electric arcs of breaker |
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| CN103454582A true CN103454582A (en) | 2013-12-18 |
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| CN2013103930883A Pending CN103454582A (en) | 2013-09-03 | 2013-09-03 | Detection device for broken-down electric arcs of breaker |
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| CN203405551U (en) * | 2013-09-03 | 2014-01-22 | 辽宁工程技术大学 | Breaker fault arc detector |
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- 2013-09-03 CN CN2013103930883A patent/CN103454582A/en active Pending
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|---|---|---|---|---|
| JPS561369A (en) * | 1979-06-20 | 1981-01-09 | Hitachi Ltd | Composite equivalent tester for circuit breaker |
| CN1601842A (en) * | 2004-09-30 | 2005-03-30 | 宁波习羽电子发展有限公司 | Arc and leakage protector |
| CN202019191U (en) * | 2011-05-13 | 2011-10-26 | 黄武杰 | Electric arc fault circuit breaker |
| CN103376372A (en) * | 2012-04-23 | 2013-10-30 | 福建俊豪电子有限公司 | Three-phase AFCI detecting device |
| CN203405551U (en) * | 2013-09-03 | 2014-01-22 | 辽宁工程技术大学 | Breaker fault arc detector |
Non-Patent Citations (1)
| Title |
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| 赵淑敏: "AFCI（故障电弧断路器）的研制", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
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