CN201608506U - Underground coal mine movable substation low-voltage side protector - Google Patents
Underground coal mine movable substation low-voltage side protector Download PDFInfo
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- CN201608506U CN201608506U CN2010200625096U CN201020062509U CN201608506U CN 201608506 U CN201608506 U CN 201608506U CN 2010200625096 U CN2010200625096 U CN 2010200625096U CN 201020062509 U CN201020062509 U CN 201020062509U CN 201608506 U CN201608506 U CN 201608506U
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Abstract
The utility model discloses an underground coal mine movable substation low-voltage side protector, which is characterized in that circuits of the protector include an ARM embedded microcontroller U1, a current signal precise rectifying circuit, a voltage signal precise rectifying circuit, an electric leakage signal detecting circuit, a phase detecting circuit, a CAN bus interface circuit, a tripping control circuit, a fault recording storage circuit, a clock calendar circuit, an LCD display circuit, a keyboard interface circuit and a reset circuit. Based on an ARM embedded system, the underground coal mine movable substation low-voltage side protector has perfect protecting functions, can perform long-distance communication through CAN bus communication interfaces so as to perform corresponding protection for faults such as short circuit, overload, electric leakage, phase loss, overvoltage, undervoltage and the like happening on a movable substation low-voltage side loop, improves instantaneity of a system, and enables protection action of the movable substation low-voltage side protector to be more reliable, accurate and timely.
Description
Technical field
The utility model relates to electric power system protection instrument, a kind of intelligent comprehensive protection instrument that is suitable for low-voltage power supply side in mobile substation under the coal mine of more specifically saying so.
Background technology
Along with the raising of modern mining mechanization degree, the mechanical device electricity capacity that coal-face uses is increasing, causes traditional supply power mode of being powered to coal-face by working section sub station can not satisfy the requirement that mine safety is powered.Modern high-grade mechanical coal mining working face, particularly fully-mechanized mining working adopt high pressure to go deep into the mobile substation supply power mode of load centre mostly.Adopt as combining under the coal mine mobile substation, the power supply of fully mechanized workface power consumption equipment, and its power supply reliability and fail safe are directly connected to raw coal production and personal safety.Because work under bad environment under the coal mine, load fluctuation is big, operating mode is very unstable, the gas and coal dust accidents such as roof fall of gathering, drip all can make insulation of electrical installation intensity reduce gradually, add that operating personnel safeguard improper or faulty operation, cause the transmission line phenomenon of rupture to happen occasionally, and faults such as electric leakage and single-phase earthing often occur.If earth fault is not in time got rid of, each phase line of electrical network can be moved under the on-Line Voltage, is easy to cause insulation breakdown, even two-phase or three-phase shortcircuit accident take place.Owing to single-phase earthing, phase fault will produce electric arc when taking place, also gas, coal-dust explosion be might cause simultaneously, personal safety and mine normal production directly jeopardized.
Mobile substation low-pressure side protector is the important component part of mobile substation, and it mainly is that the load-side low voltage electric network faults such as electric leakage, overload, short circuit, the phase failure and overvoltage/undervoltage that occur that are in operation are carried out corresponding protection.
At present, mobile substation low-pressure side protector is many to serve as the control core with more rudimentary 8-bit microcontroller, the defencive function imperfection, and existing problem mainly comprises:
1, short-circuit protection function imperfection can not differentiate the starting current and the short circuit current of big motor effectively, causes the misoperation of short-circuit protection easily;
2, the system real time of whole protecting device is not high, can not carry out telecommunication.
The utility model content
The utility model is for avoiding above-mentioned existing in prior technology weak point; provide a kind of perfect based on ARM embedded system, defencive function, can carry out mobile substation low-pressure side protector under the coal mine of telecommunication by the CAN bus communication interface; so that faults such as the short circuit that occurs for low-pressure side loop, mobile substation, overload, electric leakage, the phase failure, overvoltage/undervoltage are carried out corresponding protection; the real-time of raising system; make that the protection action of mobile substation low-pressure side protector is reliable more, accurate, more timely.
The utility model technical solution problem adopts following technical scheme:
The design feature of mobile substation low-pressure side protector is that the circuit of described protector is formed and to be comprised ARM embedded microcontroller U1, current signal precise rectification circuit, voltage signal precise rectification circuit, leakaging signal detecting circuit, phase detecting circuit, CAN bus interface circuit, sub-gate control circuit, failure logging memory circuit, clock/calendar circuit, LCD display circuit, keyboard interface circuit under the utility model coal mine, and reset circuit;
Described ARM embedded microcontroller U1 catches the phase difference detection that channel C AP0.1 finishes electric current I A and voltage U A by the sampling that its A/D passage AIN0～AIN5 finishes electric current I A, IB, IC, voltage U A, electric leakage signal LDXH and insulation signal JYXH by it; Realization comprises that the separating brake control signal of short-circuit protection, overload protection and earth leakage protective is by ARM embedded microcontroller U1 output pin P0.8 control triode T1 conducting, and cause the high-pressure side, mobile substation by relay U9 output closure signal, make the high-pressure side cut off power supply to low-pressure side; Button K1～K4 in the described ARM embedded microcontroller U1 supervisory control system, and finish system parameters in conjunction with LCD display part RT12864M and adjust and inquire about.
The design feature of mobile substation low-pressure side protector also is under the utility model coal mine:
The circuit integral body of described protector is arranged on the circuit board, described circuit board is set is electrically connected with pulling and inserting type binding post JP1 and ancillary equipment.
Short-circuit protection in the described separating brake control signal is to adopt phase-sensitive protection, and described phase-sensitive protection is when detecting size of current, detects the phase difference of electric current and voltage, with the product of electric current and the power factor basis for estimation as short-circuit protection.
Compared with the prior art, the utility model beneficial effect is embodied in:
1, the circuit integral body of the utility model protector can be arranged to the integrated circuit board form, and other equipment are electrically connected in binding post that employing can plug and the mobile substation.Therefore, to the maintenance of protector with change convenient, fast.
2, the utility model protector is on short-circuit protection function is realized; can adopt the phase-sensitive protection principle; promptly when detecting size of current; detect the phase difference of electric current and voltage again; with the product of electric current and power factor basis for estimation as short-circuit protection; the starting current that can distinguish motor load like this still is real short circuit current, protector misoperation when effectively preventing electric motor starting.
3, the utility model protector serves as the control core with 32 ARM controller LPC2292, and the performance of controller can satisfy comparatively complicated functional requirement considerably beyond 8 common single-chip microcomputers; By embedded real-time operating system μ C/OS-II is transplanted among the LPC2292; all application programs are weaved into one by one little task; these tasks are all moved under the management of μ C/OS-II and are not disturbed mutually; thereby guaranteed the real-time and the functional reliability of protector system, and the software function expansion becomes more or less freely.
4, the utility model protector has the CAN Bus interface, and the CAN bus has that communication distance is far away, the node number is many and the advantage such as stable of communicate by letter, is widely used in industry spot and controls.The CAN bus is integrated in the utility model, can realize mobile substation under the coal mine is monitored in real time, can be with the ruuning situation of mobile substation, down-hole (as electric current, voltage, the electric leakage situation, insulating resistance value, switch running status etc.) accurately and timely be reflected to server, commander, management, the attendant grasps the ruuning situation of mobile substation, down-hole at any time, so that take correct action, guarantee electric power system stable operation, solve the colliery and moved the potential safety hazard that power supply exists, realize that essential safe type moves power supply, can improve the mine normal production cycling rate, promote mine capacity.
Description of drawings
Fig. 1 is the utility model circuit composition frame chart.
Fig. 2 is the utility model circuit theory diagrams.
Below by embodiment, the utility model is described in further detail in conjunction with the accompanying drawings.
Embodiment
Referring to Fig. 1, the circuit of present embodiment is formed and is comprised ARM embedded microcontroller LPC2292, current and voltage signals precise rectification circuit, leakaging signal detecting circuit, cable insulation signal deteching circuit, phase detecting circuit, CAN bus interface circuit, sub-gate control circuit, failure logging memory circuit, clock/calendar circuit, LCD display circuit, keyboard interface circuit and controller reset circuit, wherein:
ARM embedded microcontroller LPC2292 is the control core of whole protecting device, the controlled function that the system that finishes is all;
The current and voltage signals precise rectification circuit is used for the AC current-voltage conversion of signals is become direct current signal, then for system controller LPC2292 sampling, for the error protections such as overload, short circuit and overvoltage/undervoltage of system provide foundation.The AC current-voltage signal that is converted provides by being installed in the locational current-voltage transformer in low-voltage side outlet chamber, mobile substation;
Leakaging signal detecting circuit is used to detect mobile substation low-pressure side supply line earth impedance situation, this circuit reflects into voltage signal with supply line's impedance magnitude over the ground, and controller LPC2292 judges the electric leakage situation of electric power system according to the size of this voltage signal;
The cable insulation signal deteching circuit is used to detect the insulation degree of mobile substation low-pressure side service cable, this circuit reflects into voltage signal with the insulation degree of service cable, and controller LPC2292 judges the insulation degree of service cable according to the size of this voltage signal;
Phase detecting circuit is used to detect the phase difference between the A phase voltage electric current, thereby obtains the size of power factor;
The CAN bus interface circuit is used to realize CAN bus network communication function;
Sub-gate control circuit is used for providing the closing contact signal to the high-pressure side, mobile substation, and this closing contact signal can make high-pressure side, mobile substation circuit breaker disconnect, thereby cuts off the power supply to low-pressure side;
The moment that the register system that is used for the failure logging memory circuit breaks down, type are so that operating personnel check;
The clock/calendar circuit is used for the generation system time, comprising year, month, day, hour, min, second as an electronic clock generator;
The LCD display circuit is used for the display system parameter, and displaying contents comprises voltage, current value, fault state and setting parameter etc.;
Keyboard interface circuit is used for 4 operation push-buttons of connected system, discerns for controller LPC2292;
Can normally reset when the controller reset circuit is used to guarantee system start-up, thereby system is brought into operation from a definite state;
Circuit structure in concrete the enforcement comprises as shown in Figure 2:
With No. three current transformer output signal IA of mobile substation low-pressure side, 5,6,7 pin of IB, IC difference connecting terminal JP1; 8 pin with voltage transformer output signal U A connecting terminal JP1; With the lead end LDXH of the lead end JYXH of the cable insulation checkout gear in the low-pressure side of mobile substation and earth detector 9,10 pin of connecting terminal JP1 respectively; Mobile substation on high-tension side separating brake closure signal Close1 and Close2 3,4 pin of connecting terminal JP1 respectively will be inputed to; With external power supply+40V, 40V GND ,+3.3V ,+5V ,+12V ,-12V and GND 11,12,13,14,15,16,17 pin of connecting terminal JP1 respectively; When needs CAN bus communication, two communication terminal CANH in the CAN bus communication network and CANL can be connected respectively to 1 and 2 pin of terminal JP1.
LPC2292 controller U1 finishes electric current I A by its A/D passage AIN0～AIN5; IB; IC; voltage U A; the sampling of electric leakage signal LDXH and insulation signal JYXH; catch the phase difference detection that channel C AP0.1 finishes electric current I A and voltage U A by it; according to the sampled result of these parameters with catch the result; U1 judges whether electric power system overload occurs; electric leakage; faults such as short circuit; when needing tripping operation if break down; U1 is by pin P0.8 control triode T1 conducting; thereby make relay U9 action; export a closure signal and give the high-pressure side, mobile substation; make the power supply of high-pressure side cut-out to low-pressure side, thus the purpose of start protection power supply unit.Simultaneously, U1 is 4 button K1～K4 of supervisory control system also, and in conjunction with LCD display part RT12864M, finish the operation such as various parameter tunings, inquiry of system.The software operation of The whole control system is all finished under embedded real-time operating system μ C/OS-II management, thereby has strengthened the real-time and the reliability of control system greatly.
The current and voltage signals precise rectification circuit has four groups, and four groups of structures are identical.Wherein, A phase current precise rectification circuit is made up of resistance R 14～R23, potentiometer W2, LM324 operational amplifier U10, diode D2, D3 and capacitor C 7.The AC signal IA that comes from current transformer is at first by after R14, W2 and the R15 dividing potential drop, deliver to voltage follower U10B, through U10B output after become direct current signal after U10D and D2, the D3 rectification, amplify through U10A again, after after R23 and the C7 low-pass filtering, deliver to the A/D sampling channel AIN0 of controller LPC2292; B phase current precise rectification circuit is made up of resistance R 24～R33, potentiometer W3, LM324 operational amplifier U11, diode D4, D5 and capacitor C 8.The AC signal IB that comes from current transformer is at first by after R24, W3 and the R25 dividing potential drop, deliver to voltage follower U11B, through U11B output after become direct current signal after U11D and D4, the D5 rectification, amplify through U11A again, after after R33 and the C8 low-pass filtering, deliver to the A/D sampling channel AIN1 of controller LPC2292; C phase current precise rectification circuit is made up of resistance R 34～R43, potentiometer W4, LM324 operational amplifier U12, diode D6, D7 and capacitor C 9.The AC signal IC that comes from current transformer is at first by after R34, W4 and the R35 dividing potential drop, deliver to voltage follower U12B, through U12B output after become direct current signal after U12D and D6, the D7 rectification, amplify through U12A again, after after R43 and the C9 low-pass filtering, deliver to the A/D sampling channel AIN2 of controller LPC2292; A phase voltage precise rectification circuit is made up of resistance R 44～R53, potentiometer W5, LM324 operational amplifier U13, diode D8, D9 and capacitor C 10.The AC signal UA that comes from voltage transformer is at first by after R44, W5 and the R45 dividing potential drop, deliver to voltage follower U13B, through U13B output after become direct current signal after U13D and D8, the D9 rectification, amplify through U13A again, after after R53 and the C10 low-pass filtering, deliver to the A/D sampling channel AIN3 of controller LPC2292.
Leakaging signal detecting circuit is made up of resistance R 54～R57, potentiometer W6, diode D12, D13, LM324 operational amplifier U16B and capacitor C 11.Terminal LDXH signal is provided by the inner leakage detection apparatus in mobile substation, this terminal impedance magnitude over the ground directly reflects the electric leakage situation of electric power system, under the effect of DC power supply+40V, terminal LDXH impedance magnitude over the ground is converted into d. c. voltage signal, by after resistance R 56, R57 and the C11 filtering, be sent to the A/D sampling channel AIN4 of controller LPC2292 through voltage follower U16B then.
The cable insulation signal deteching circuit is made up of resistance R 58～R61, potentiometer W7, diode D14 and LM324 operational amplifier U16C.Under the effect of DC power supply+12V, the bridge circuit of being made up of resistance R 58～R61, D14 and W7 is converted into voltage signal with the impedance magnitude of terminal JYXH, sends into the A/D sampling channel AIN5 of controller LPC2292 after voltage follower U16C output.
Phase detecting circuit is made up of LM324 operational amplifier U14, voltage stabilizing didoe D10, D11 and 74HC86 exclusive or logic gate circuit U 15.Come from the two-way sinusoidal ac signal IA of electric current and voltage transformer and UA respectively behind voltage follower U14A and U14B, deliver to zero-crossing comparator U14C and U14D, become the synchronous square wave of two-way and IA and UA, this two-way square wave is again behind the U15 XOR, become one tunnel square wave relevant with the UA phase difference with IA, this square wave is admitted to the timer of controller LPC2292 at last and catches channel C AP0.1.
The CAN bus interface circuit is made up of resistance R 6～R10,6N137 photoelectrical coupler U6, U7 and TJA1050CAN bus line data transceiver U8.By the inner integrated CAN bus control unit of controller LPC2292, add CAN bus line data transceiver U8 and can constitute the CAN bus interface, U6, U7 are used for level conversion and the photoelectricity coupling strengthens antijamming capability, and resistance R 10 is CAN bus interface build-out resistors.
Sub-gate control circuit is by resistance R 11, R12, R12, capacitor C 6, triode T1, and diode D1, relay U9 and button K5 form.When system broke down the need tripping operation, high level of pin P0.8 output of slave controller LPC2292 makes triode T1 conducting, and was electric thereby the coil of relay U9 gets, and made normally opened contact 8 and 9 closures of U9, and this closure signal is given the high-pressure side, mobile substation.Wherein, K5 is a manual brake separating switch, and K5 presses and also will produce a closure signal to the high-pressure side, mobile substation, and the high-pressure side is controlled its circuit breaker and disconnected, thereby cuts off the power supply to low-pressure side.
The failure logging memory circuit is that U17 forms by resistance R 1, R2 and eeprom memory chip AT24C02.Controller LPC2292 conducts interviews to U17 by its iic bus pin SCL and SDA.When system broke down, the moment that fault type and fault appear in LPC2292 is written among the U17 preserved, and when needs were checked fault state, LPC2292 sense data from U17 was reflected to LCD and shows, and consults for operating personnel.
The clock/calendar circuit is made up of capacitor C 4, C5, crystal oscillator OS2, DS1302 clock chip U4 and 3.6V battery BE1.Controller LPC2292 chooses U9 by pin P0.10, produces the CLK signal by pin P0.9, under the effect of this CLK, by pin P0.11 U9 is provided with and the time for reading data.
The LCD display circuit is made up of resistance R 3, R4, R5, potentiometer W1 and LCD display RT12864M.Adopt serial data mode that U2 is controlled, the pin P0.7 of controller LPC2292 is used to choose U2, and pin P0.5 is used to produce CLK, and pin P0.6 is used to produce serial data.
Keyboard interface circuit is made up of 4 button K1～K4 of exclusion RP1,74HC245 data buffer U5 and system.When button disconnects, level state on the line of connection respective keys is a high level, when button is closed, level state on the line of connection respective keys is a low level, these high or low level signals enter B5～B8 pin of U5, A5～A8 pin output from U5 is connected on data/address bus D0～D3 of controller LPC2292, reads for LPC2292 then.
The controller reset circuit is made up of button K0 and the CAT825S control chip U3 that resets.When system powers on, export the RESET pin of a low level from the RST pin of U3, thereby cause that LPC2292 resets to controller LPC2292.Wherein, K0 is used for hand-reset.
System's button operation is exemplified below:
1, manual brake separating
The K5 that pushes button, this moment, protector was not directly realized the quick relay disjunction of switch by ARM controller LPC2292 and signal conditioning circuit, Chang Zuowei system scram button breaks down and protector uses when not moving in system.
2, hardware reset
The K0 that pushes button, this moment, ARM controller LPC2292 restarted, and promptly from the initial condition rerun routine, when system the deadlock situation occurs or moves when undesired, can use button K0.
3, System self-test
The K3 that pushes button, this moment, controller was finished the cycle detection to all defencive functions, judged whether these defencive functions are normal.If defencive function is normal, then on the LCD display part, shows " normally " printed words, otherwise show " mistake " printed words.
4, system reset
The K4 that pushes button is so this moment, controller was removed current malfunction.If there is malfunction not remove, and physical fault has been got rid of, and system can not close a floodgate and send.After fault is got rid of, should press K4, so that system can normally close a floodgate.Simultaneously, this key also plays the function of acknowledgement key in system parameters is adjusted.
5, system parameters inquiry
Utilize button K1 and LCD display menu to combine, the query function of the various parameters of realization system.At first click K1, click K1 once more and select the system parameters item that will inquire about in the Drop Down Menu Choices that show, as selecting " failure logging ", this duration is kept more than 3 seconds by K1, then enters the display frame that shows failure logging.Other parameter query method is similar with it.Parameter query can only be checked, can not revise, if will revise, then need carry out the parameter tuning operation.
6, system parameters is adjusted
Utilize button K1, K2, K4 and LCD display menu to combine, the setting function of the various parameters of realization system.
(1) protection parameter tuning
The protection parameter tuning has the short circuit multiple to adjust and rated current is adjusted two, at first presses K2 under main menu, enters the parameter tuning options screen, presses K1 and select " protection parameter tuning " in the option that occurs, and enters the picture of adjusting by K2 then.In the picture that occurs, adjust corresponding parameters with button K1.After treating that parameter adjustment is intact, confirm and get back in the main menu by K4.
(2) time is adjusted
At first under main menu, press K2, enter the parameter tuning options screen, in the option that occurs, press K1 and select " time adjustment ", press the K2 entry time then and adjust picture.Press K2 again and select to adjust year, month, day, hour, min or second, adjust corresponding numeral size with button K1 then.After the time for the treatment of adjusted, confirm and get back in the main menu by K4.
(3) CAN bus interface parameter adjustment
At first under main menu, press K2, enter the parameter tuning options screen, in the option that occurs, press K1 and select " adjustment of CAN interface parameters ", enter the adjustment picture by K2 then.Pressing K2 selection adjustment communication baud rate again still is ID number, adjusts the corresponding parameters size with button K1 then.After treating that the parameter adjustment of CAN bus interface is intact, confirm and get back in the main menu by K4.
Claims (3)
1. low-pressure side protector in mobile substation under the coal mine, the circuit composition that it is characterized in that described protector comprises ARM embedded microcontroller U1, current signal precise rectification circuit, voltage signal precise rectification circuit, leakaging signal detecting circuit, phase detecting circuit, CAN bus interface circuit, sub-gate control circuit, failure logging memory circuit, clock/calendar circuit, LCD display circuit, keyboard interface circuit, and reset circuit;
Described ARM embedded microcontroller U1 catches the phase difference detection that channel C AP0.1 finishes electric current I A and voltage U A by the sampling that its A/D passage AIN0～AIN5 finishes electric current I A, IB, IC, voltage U A, electric leakage signal LDXH and insulation signal JYXH by it; Realization comprises that the separating brake control signal of short-circuit protection, overload protection and earth leakage protective is by ARM embedded microcontroller U1 output pin P0.8 control triode T1 conducting, and cause the high-pressure side, mobile substation by relay U9 output closure signal, make the high-pressure side cut off power supply to low-pressure side; Button K1～K4 in the described ARM embedded microcontroller U1 supervisory control system, and finish system parameters in conjunction with LCD display part RT12864M and adjust and inquire about.
2. mobile substation low-pressure side protector under the coal mine according to claim 1 is characterized in that the circuit integral body of described protector is arranged on the circuit board, described circuit board is set is electrically connected with pulling and inserting type binding post JP1 and ancillary equipment.
3. mobile substation low-pressure side protector under the coal mine according to claim 1; it is characterized in that the short-circuit protection in the described separating brake control signal is to adopt phase-sensitive protection; described phase-sensitive protection is when detecting size of current; detect the phase difference of electric current and voltage, with the product of electric current and power factor basis for estimation as short-circuit protection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200625096U CN201608506U (en) | 2010-01-15 | 2010-01-15 | Underground coal mine movable substation low-voltage side protector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010200625096U CN201608506U (en) | 2010-01-15 | 2010-01-15 | Underground coal mine movable substation low-voltage side protector |
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| CN201608506U true CN201608506U (en) | 2010-10-13 |
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| CN2010200625096U Expired - Fee Related CN201608506U (en) | 2010-01-15 | 2010-01-15 | Underground coal mine movable substation low-voltage side protector |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102621438A (en) * | 2011-01-17 | 2012-08-01 | 通用电气公司 | Methods and systems involving monitoring circuit connectivity |
| CN102904202A (en) * | 2012-10-29 | 2013-01-30 | 浙江星明智能电气科技有限公司 | Intelligent re-closing circuit breaker |
| CN103056187A (en) * | 2012-11-30 | 2013-04-24 | 福建工程学院 | Non-extrusion event recording system and non-extrusion event recording method of aluminum extrusion device |
| CN104393575A (en) * | 2014-10-24 | 2015-03-04 | 上海山源电子科技股份有限公司 | Phase-sensitive protection method and system for coal mine low-voltage distribution protector |
| CN108306257A (en) * | 2018-04-07 | 2018-07-20 | 佛山市顺德区信辉达电子有限公司 | Three pole break-make leakage protecting plug of intelligent control type |
| CN110667383A (en) * | 2018-06-08 | 2020-01-10 | 舍弗勒技术股份两合公司 | Monitoring system for detecting high-voltage circuit of vehicle and vehicle |
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2010
- 2010-01-15 CN CN2010200625096U patent/CN201608506U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102621438A (en) * | 2011-01-17 | 2012-08-01 | 通用电气公司 | Methods and systems involving monitoring circuit connectivity |
| CN102904202A (en) * | 2012-10-29 | 2013-01-30 | 浙江星明智能电气科技有限公司 | Intelligent re-closing circuit breaker |
| CN102904202B (en) * | 2012-10-29 | 2015-09-09 | 浙江星明智能电气科技有限公司 | Intelligent reclosing circuit breaker |
| CN103056187A (en) * | 2012-11-30 | 2013-04-24 | 福建工程学院 | Non-extrusion event recording system and non-extrusion event recording method of aluminum extrusion device |
| CN103056187B (en) * | 2012-11-30 | 2015-07-22 | 福建工程学院 | Non-extrusion event recording system and non-extrusion event recording method of aluminum extrusion device |
| CN104393575A (en) * | 2014-10-24 | 2015-03-04 | 上海山源电子科技股份有限公司 | Phase-sensitive protection method and system for coal mine low-voltage distribution protector |
| CN104393575B (en) * | 2014-10-24 | 2017-05-31 | 上海山源电子科技股份有限公司 | Phase-sensitive protection method and system for coal mine low-voltage distribution protector |
| CN108306257A (en) * | 2018-04-07 | 2018-07-20 | 佛山市顺德区信辉达电子有限公司 | Three pole break-make leakage protecting plug of intelligent control type |
| CN110667383A (en) * | 2018-06-08 | 2020-01-10 | 舍弗勒技术股份两合公司 | Monitoring system for detecting high-voltage circuit of vehicle and vehicle |
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