CN203455467U - Device for calibrating high-voltage switch mechanical characteristic tester - Google Patents
Device for calibrating high-voltage switch mechanical characteristic tester Download PDFInfo
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- CN203455467U CN203455467U CN201320557720.9U CN201320557720U CN203455467U CN 203455467 U CN203455467 U CN 203455467U CN 201320557720 U CN201320557720 U CN 201320557720U CN 203455467 U CN203455467 U CN 203455467U
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Abstract
The utility model discloses a device for calibrating a high-voltage switch mechanical characteristic tester. The utility model solves the defects in the prior art that the key parameters of the high-voltage switch mechanical characteristic tester are tested by a temporarily built measuring circuit, causing the problems that the operation process is complex, the number of detection parameters is small, and the accuracy of data is low. The device comprises a cabinet, a mainboard and a displacement-type speed sensor simulation unit. A keyboard, a power switch, an LED screen, a connection/disconnection signal input/output interface, an encoder-type speed sensor simulation output interface and a displacement-type speed sensor detection unit interface are arranged on a panel of the cabinet. The beneficial effects of the utility model are that the device has the advantages of high integration, high measuring precision and automatic operation, and the comprehensive metering calibration and tracing of the high-voltage switch mechanical characteristic tester are achieved.
Description
Technical field:
The utility model relates to a kind of high-voltage switch mechanical characteristic tester calibration equipment, for high-voltage switch mechanical characteristic tester being carried out to measurement and calibration and the voltage of high-voltage switch mechanical characteristic tester, time parameter being traced to the source to national low-frequency voltage and time and frequency standard.
Background technology:
High-voltage switch gear is that voltage surpasses the equipment general name that 1kV is used for being switched on or switched off circuit, is very important equipment for power transmission and distribution.It is safe and reliable, to whole electric system safe, effectively move tool and be of great significance.In order to guarantee the safe and reliable of high-voltage switch gear action, in the process of switch production, installment and debugging, must carry out strict test to its mechanical property, and using this as judging that whether this switch quality is qualified, the important evidence that can come into operation safely.China generally adopts switching characteristic tester to carry out the key parameters such as minute (closing) lock time, speed and stroke of testing high voltage switch.Yet, at present owing to also there is no special-purpose detecting instrument, relevant metrological service can only complete by building metering circuit the measurement of key parameter, the version that metering circuit is carried out crucial parameter measurement is built in this employing temporarily, exist operating process loaded down with trivial details, the technical matterss such as detected parameters is few, and the accuracy of data is low, and then directly affected work quality and the efficiency measured.
Summary of the invention:
The utility model carries out the measurement of key parameter at present in order to solve by build metering circuit temporarily, and the operating process existing is loaded down with trivial details, detected parameters is few, the accuracy of data is low, and then directly affected the technical matters of surveying work quality and efficiency, a kind of high-voltage switch mechanical characteristic tester calibration equipment is provided, it comprises cabinet, mainboard and displacement type speed pickup pick-up unit, on the panel of described cabinet, be provided with keyboard, power switch, lcd screen, on the panel of described cabinet, be also provided with on/off switch signal input output interface, encoder type speed pickup simulation output interface and displacement type speed pickup pick-up unit interface, they all with cabinet in each corresponding module control linkage on mainboard, for high-voltage switch mechanical characteristic tester being carried out to measurement and calibration and the voltage of high-voltage switch mechanical characteristic tester, time parameter being traced to the source to national low-frequency voltage and time and frequency standard.
Feature of the present utility model and beneficial effect: this device has that integrated level is high, measuring accuracy is high, the feature of full automatic working, can carry out comprehensive measurement and calibration and trace to the source high-voltage switch mechanical characteristic tester.
Be in particular in:
1, meet the measurement and calibration requirement of measuring mechanical characteristics of high-voltage switch instrument completely, can the voltage parameter of measuring mechanical characteristics of high-voltage switch instrument, time parameter and speed parameter be carried out automatic calibration and be traced to the source.
2, use the constant temperature crystal oscillator with high stability OCXO8789 of Oscilloquartz company, its second surely can reach 1 * 10
-12, ageing rate is better than 5 * 10
-10/ day, make this device switch motion time precision be better than 1us.
3, use the high-performance ARM chip STM32F103R of ST company, it possesses powerful interruption processing capacity, by constant temperature crystal oscillator with high stability OCXO8789 and its inner impulsive measurement circuit, can realize the high-acruracy survey of negative pulse width, measuring accuracy is better than 20ns.
4, used the high-speed analog switch array in wireless communication applications, under the control of microprocessor module, can accurately simulate 3 fractures, 6 fractures and 12 fractures divide-shut brake, on/off switch, minute on/off switch, close divide-shut brake, spring, not all switch on/off switch actions such as same period.Breaker acting speed is better than 100ns, is far superior to the measuring accuracy 10us of High Voltage Breaker Mechanical Characteristic test.
5, possess independently crystal oscillator output interface, its inner constant temperature high stability crystal oscillator can be exported, and then its time parameter is traced to the source; Possess high stability crystal oscillator input interface simultaneously, can further improve measuring accuracy by inputting outside high stability crystal oscillator.
6, there is encoder type speed pickup simulation output function, can directly carry out measurement and calibration to encoder type speed pickup.
7, have displacement type speed pickup pick-up unit, its measurement by average velocity is converted to the measurement of electric signal negative pulse width, can directly carry out measurement and calibration to displacement type speed pickup.
Accompanying drawing explanation:
Fig. 1 is the utility model cabinet panel structural representation;
Fig. 2 is motherboard hardware structural representation of the present utility model;
Fig. 3 is displacement type speed pickup analogue means structural representation of the present utility model.
Embodiment:
Referring to Fig. 1-Fig. 3, high-voltage switch mechanical characteristic tester calibration equipment, it comprises cabinet 6, mainboard 17 and displacement type speed pickup pick-up unit 18, on the panel of described cabinet 6, be provided with keyboard 1, power switch 3, lcd screen 7, on the panel of described cabinet 6, be also provided with on/off switch signal input output interface 2, encoder type speed pickup simulation output interface 4 and displacement type speed pickup pick-up unit interface 5; They all with the interior mainboard 17 of cabinet 6 on each corresponding module control linkage.Wherein:
Described on/off switch signal input output interface 2 comprises the output interface of signal A1, B1, C1, A2, B2, C2, A3, B3, C3, A4, B4, C4, G1 and G2, the input interface of signal RelayOn1, RelayOn2, RelayOff1 and RelayOff2, these interfaces are directly connected with the on/off switch signal input output interface of high-voltage switch mechanical characteristic tester to be calibrated by joint connecting wire;
Described on/off switch signal input output interface 2 also comprises high stability crystal oscillator input interface RFIN and constant temperature high stability crystal oscillator output interface RFOUT, and these interfaces are directly connected with mainboard 17 respectively by joint connecting wire;
Described encoder type speed pickup simulation output interface 4 comprises the output interface of signal VCCB, GND1, CLK, A and B, and these interfaces are directly connected with the encoder type speed sensor signal input interface of high-voltage switch mechanical characteristic tester to be calibrated by plug connecting line;
Described displacement type speed pickup pick-up unit interface 5 comprises the output interface of signal VCCB, GND1 and Trigger and the input interface of signal Puls, and these interfaces are directly connected with the aviation plug connector 20 of displacement type speed pickup pick-up unit 18 by plug connecting line;
Described mainboard 17 comprises microprocessor module 16, display module 15, power module 14, communication module 13, on/off switch signaling module 12, pulse width measuring module 11, encoder type speed pickup analog output module 10, constant temperature high stability crystal oscillator module 9 and Keysheet module 8, between above-mentioned each module, all by circuit, connects.Wherein:
Described on/off switch signaling module 12, by high-speed analog switch device array the electric circuit constitute, can simulate 3 fractures, 6 fractures and 12 fractures divide-shut brake, on/off switch, minute on/off switch, close divide-shut brake, spring, the not same period and all switch on/off switch actions;
Described encoder type speed pickup analog output module 10, is comprised of logical circuit and high speed optoelectronic coupled circuit, for the output signal of analog encoding type speed pickup and encoder type speed pickup is carried out to measurement and calibration;
Described pulse width measuring module 11, mainly in holding circuit and microprocessor module 16, built-in trigger circuit, timer circuit forms, for measuring the negative pulse width of displacement type speed pickup pick-up unit output.
Described displacement type speed pickup pick-up unit 18, by pull down resistor 28, target 27, guide rail 26, striker 25, machine draw together 24, guide cylinder body 23, spring 22, rubber handle 21, aviation plug connector 20, electromagnet 19 and associated driver circuitry form.Wherein:
Described aviation plug connector 20 comprises VCCB, GND1 and Trigger tri-road input signals and Puls mono-tunnel output signal; Described Trigger signal is used for controlling the adhesive of associated driver circuitry drive magnetic or reset, to control the operation of striker system; Described Puls signal is defaulted as high level signal, at striker, between moving period, is only low level signal, and this signal is measured by the pulse width measuring module 11 by mainboard 17.
Below in conjunction with accompanying drawing and instantiation, high-voltage switch mechanical characteristic tester calibration equipment is described further.
Referring to Fig. 1-Fig. 3, described measuring mechanical characteristics of high-voltage switch instrument calibration equipment, its composition comprises: cabinet 6, the mainboard 17 in cabinet and displacement type speed pickup pick-up unit 18.The output interface of keyboard 1, on/off switch signal input output interface 2 signal A1, B1, C1, A2, B2, C2, A3, B3, C3, A4, B4, C4, G1, G2 and RFOU is installed on the panel of described cabinet 6, the input interface of signal RelayOn1, RelayOn2, RelayOff1, RelayOff2 and RFIN, these interfaces are directly connected with the on/off switch signal input output interface of high-voltage switch mechanical characteristic tester by joint connecting wire; Power switch 3, the simulation of encoder type speed pickup output interface 4, displacement type speed sensor signal pick-up unit interface 5 and LCDs 7, they are all connected with the mainboard 17 in cabinet 6 by winding displacement.
Referring to Fig. 2, described mainboard 17 comprises: Keysheet module 8, constant temperature high stability crystal oscillator module 9, encoder type speed pickup analog output module 10, pulse width measuring module 11, on/off switch signaling module 12, communication module 13, power module 14, display module 15 and microprocessor module 16, connect by circuit between its each module.
Hardware Anti-shaking circuit and trigger circuit that the 74LS164 chip of BC7281, the SOP encapsulation that described Keysheet module 8 is mainly encapsulated by DIP forms form, and when it supports at most 64 buttons and 2 buttons, trigger;
Described constant temperature high stability crystal oscillator module 9 mainly consists of the constant temperature crystal oscillator with high stability OCXO8789 of Oscilloquartz company, and surely can reach 1 * 10 the second of crystal oscillator
-12, ageing rate is better than 5 * 10
-10/ day, make switch motion time precision of the present utility model be better than 1us;
The high speed optoelectronic coupling chip PC817 of the logic chip 74LS14 that described encoder type speed pickup analog output module 10 is encapsulated by SOP and DIP encapsulation forms, output signal that can analog encoding type speed pickup;
Trigger circuit, timer circuit built-in in the overvoltage crowbar that described pulse width measuring module 11 mainly consists of 1N4007 and the microprocessor chip STM32F103R of LQFP encapsulation form, it can complete the measurement of negative pulse width, and measuring accuracy is better than 20ns;
Described on/off switch signaling module 12, mainly consists of protective resistance and 12 groups of MSOP encapsulation high-speed analog switch chip TS12A12511, and switching speed is better than 100ns.It can simulate 3 fractures, 6 fractures and 12 fractures divide-shut brake, on/off switch, minute on/off switch, close divide-shut brake, spring, the not same period and all switch on/off switch actions;
The CH376 sheet that described communication module 13 is mainly encapsulated by MSOP and the MAX232 chip of SOP encapsulation form.Wherein the CH373 chip form with ASCII character by measurement data that is mainly used in is stored in USB flash disk; MAX232 chip is mainly used in and dataphone, and measurement data is uploaded to computer;
Described power module 14 by possess 12V/1A, 5V/3A output Switching Power Supply, LM2937 and the correlation filtering circuit of SOP encapsulation form.Wherein 3.3V is for the power supply of microprocessor module 16, and 5V is for the power supply of most of chip on lcd screen 7 and mainboard 17, and 12V is for the power supply of analog switch array chip;
The bus driver chip 74LS245 chip that described display module 15 is encapsulated by SOP and being formed by high official position LCM12864 LCD screen;
Described microprocessor module 16 is comprised of ARM chip STM32F103R and the interlock circuit of 64 pin LQFP encapsulation, for controlling demonstration, keyboard, input and output and the measurement of high-voltage switch mechanical characteristic tester calibration equipment, calculates;
The principle of work of time parameter calibrated section: close after (dividing) lock signal when high-voltage switch mechanical characteristic tester to be calibrated sends, after the photoelectricity isolation of this signal by on/off switch signaling module 12 and signal condition module, become regular lower jumping along signal, then enter the interrupting input pin of input/output module B in microprocessor module 16, then cause the external interrupt of microprocessor module 16, microprocessor module 16 is by carrying out its inner corresponding interrupt routine, and then control pass (opening) and the duration of analog switch array in on/off switch signaling module 12, thereby simulated high-pressure switch 3 fractures, the divide-shut brake of 6 fractures and 12 fractures, on/off switch, divide on/off switch, close divide-shut brake, spring, the not corresponding switch on/off switch action such as same period, the type of this section of action or time are measured and show by high-voltage switch mechanical characteristic tester to be calibrated, finally the measurement result of high-voltage switch mechanical characteristic tester to be calibrated is compared with standard results of the present utility model, and then the calibration of deadline parameter.
The trace to the source principle of work of part of time parameter: the execution of microprocessor module 16 every instructions, all can take the system clock of fixed qty, and the whether accurate clock order of accuarcy that all depends on constant temperature high stability crystal oscillator module 9 of system clock.Constant temperature high stability crystal oscillator module 9 clocks that this device adopts are 10MHz, after the frequency multiplier circuit frequency multiplication in microprocessor module 16, obtain the system clock frequency 70MHz of this device, so the clock performance of constant temperature high stability crystal oscillator module 9 is carried out to measurement and calibration, just can determine the time parameter of this device, and then the time parameter of this device is traced to the source.For this reason, this device is provided with RFOU interface in on/off switch IO interface 2, and it uses connecting line to be connected with the output of constant temperature high stability crystal oscillator module 9, and then the clock of this device is drawn and traced to the source.Meanwhile, this device is provided with RFIN interface in on/off switch IO interface 2, and it uses connecting line to be connected with the crystal oscillator load module in microprocessor module 16, makes this device improve measuring accuracy with more high-precision crystal oscillator input.
The principle of work of encoder type speed pickup analog output module 10: encoder type speed pickup carries out work based on grating principle, when it rotates to a direction, can export a reference clock signal CLK, both direction pulse signal A and B.For a kind of scrambler, its quantity of rotating the CLK pulse number sending for a week is changeless, by CLK signal is carried out to step-by-step counting, and then can obtain the angle that sensor rotates.Meanwhile, when A is ahead of B, represent that it rotates to a direction, before B ultrasonic, during A, represent that it rotates to another direction.Thus, the output of known scrambler is all pulse signal.This device is by the corresponding program in microprocessor module 16, control the output waveform of the input/output module D analog pulse scrambler of microprocessor module 16 inside, and then complete the measurement and calibration to the encoder type speed pickup of high-voltage switch mechanical characteristic tester.
The principle of work of pulse width measuring part: the undersuing of being exported by the Puls line of displacement type speed pickup pick-up unit 18, by input interface and the holding circuit of pulse width measuring module 11, enters the built-in trigger circuit of microprocessor module 16.When the input/output module B in microprocessor module 16 detects first negative edge, start to start internal timer and carry out timing, when it detects a rising edge, stop immediately timing, timing length is around here the width of negative pulse.
Keyboard portion principle of work: after keyboard generation actuation of keys, the input signal of keyboard can be through the hardware Anti-shaking circuit in Keysheet module 8, after removing the signal of shaking, through hardware, differentiate, if be really push button signalling, Keysheet module 8 just sends positive pulse to the input/output module C in microprocessor module 16, and then the external interrupt of initiation microprocessor module 16, then microprocessor module 16 operates Keysheet module 8 by its inner input/output module C, finally obtains key information.
The principle of work of lcd screen display section: exported according to its internal processes control inputs output module A by microprocessor module 16, then improve after load capacity by the bus driver chip in display module 15, lcd screen is shown to control.
Communication module some work principle: microprocessor module 16 can complete the operation of communication module 13 is completed to the control to the USB chip in communication module 13 and MAX3232 chip by specific function mouth by controlling its inner specific function mouth, and then possesses communication function.
Referring to Fig. 3, described displacement type speed pickup analogue means comprises: electromagnet 19, aviation plug connector 20, rubber handle 21, spring 22, guide cylinder body 23, machine draws together 24, striker 25, guide rail 26, target is 27, and pull down resistor 28, connects by mechanical fastener between its each several part.
The principle of work of speed parameter calibrated section: after displacement type speed pickup to be calibrated is connected with displacement type speed pickup pick-up unit 18 of the present utility model, the aviation plug 20 of displacement type speed pickup pick-up unit is connected with the displacement type speed sensor signal IO interface 5 on this device cabinet panel by connecting line, pulling rubber handle 21 to move to backward machine draws together 24 and blocks guide cylinder body 23, now because Trigger signal is low level, so electromagnet 19 is not worked, relation due to conduction connection, Puls signal is now high level signal, after Trigger signal is high level, electromagnet 19 is started working, its attraction irony machine is drawn together 24 and is moved downward, when machine draws together 24 while no longer blocking guide cylinder body 23, guide cylinder body 23 is subject to the thrust of spring 22 and travels forward, the relation now connecting due to conduction, Puls signal is now low level signal, after striker 25 moves along guide rail 26 and contacts 27 with target, 23 stop motions of guide cylinder body, the relation now connecting due to conduction, Puls signal is now high level signal.This process Puls signal is a negative pulse form, and the width of this pulse is the working time of striker 25, and is measured by impulsive measurement module 11.Meanwhile, the move distance of striker 25 is read by ruler, and then by distance and Time Calculation, is gone out the average velocity of striker operation, finally completes the calibration to displacement type speed pickup.
Claims (10)
1. high-voltage switch mechanical characteristic tester calibration equipment, it comprises cabinet (6), mainboard (17) and displacement type speed pickup pick-up unit (18), on the panel of described cabinet (6), be provided with keyboard (1), power switch (3), lcd screen (7), it is characterized in that: on the panel of described cabinet (6), be also provided with on/off switch signal input output interface (2), encoder type speed pickup simulation output interface (4) and displacement type speed pickup pick-up unit interface (5); They all with the interior mainboard of cabinet (6) (17) on each corresponding module control linkage.
2. high-voltage switch mechanical characteristic tester calibration equipment according to claim 1, it is characterized in that: described on/off switch signal input output interface (2) comprises the output interface of signal A1, B1, C1, A2, B2, C2, A3, B3, C3, A4, B4, C4, G1 and G2, the input interface of signal RelayOn1, RelayOn2, RelayOff1 and RelayOff2, these interfaces are directly connected with the on/off switch signal input output interface of high-voltage switch mechanical characteristic tester to be calibrated by joint connecting wire.
3. high-voltage switch mechanical characteristic tester calibration equipment according to claim 1, it is characterized in that: described on/off switch signal input output interface (2) also comprises high stability crystal oscillator input interface RFIN and constant temperature high stability crystal oscillator output interface RFOUT, and these interfaces are directly connected with mainboard (17) respectively by joint connecting wire.
4. high-voltage switch mechanical characteristic tester calibration equipment according to claim 1, it is characterized in that: described encoder type speed pickup simulation output interface (4) comprises the output interface of signal VCCB, GND1, CLK, A and B, these interfaces are directly connected with the encoder type speed sensor signal input interface of high-voltage switch mechanical characteristic tester to be calibrated by plug connecting line.
5. high-voltage switch mechanical characteristic tester calibration equipment according to claim 1, it is characterized in that: described displacement type speed pickup pick-up unit interface (5) comprises the output interface of signal VCCB, GND1 and Trigger and the input interface of signal Puls, these interfaces are directly connected with the aviation plug connector (20) of displacement type speed pickup pick-up unit (18) by plug connecting line.
6. high-voltage switch mechanical characteristic tester calibration equipment according to claim 1, it is characterized in that: described mainboard (17) comprises microprocessor module (16), display module (15), power module (14), communication module (13), on/off switch signaling module (12), pulse width measuring module (11), encoder type speed pickup analog output module (10), constant temperature high stability crystal oscillator module (9) and Keysheet module (8), between above-mentioned each module, all by circuit, connects.
7. high-voltage switch mechanical characteristic tester calibration equipment according to claim 6, is characterized in that: described on/off switch signaling module (12), and by high-speed analog switch device array the electric circuit constitute.
8. high-voltage switch mechanical characteristic tester calibration equipment according to claim 6, is characterized in that: described encoder type speed pickup analog output module (10), is comprised of logical circuit and high speed optoelectronic coupled circuit.
9. high-voltage switch mechanical characteristic tester calibration equipment according to claim 6, is characterized in that: described pulse width measuring module (11), mainly in holding circuit and microprocessor module (16), built-in trigger circuit, timer circuit forms.
10. high-voltage switch mechanical characteristic tester calibration equipment according to claim 1 or 5, it is characterized in that: described displacement type speed pickup pick-up unit (18), by pull down resistor (28), target, (27), guide rail (26), striker (25), machine are drawn together to (24), guide cylinder body (23), spring (22), rubber handle (21), aviation plug connector (20), electromagnet (19) and associated driver circuitry and formed;
Wherein: aviation plug connector (20) comprises VCCB, GND1 and Trigger tri-road input signals and Puls mono-tunnel output signal; Trigger signal is by controlling associated driver circuitry drive magnetic adhesive or reset, to control the operation of striker system; Puls signal is defaulted as high level signal, at striker, between moving period, is only low level signal, and this signal will be measured by the pulse width measuring module (11) on mainboard (17).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320557720.9U CN203455467U (en) | 2013-09-09 | 2013-09-09 | Device for calibrating high-voltage switch mechanical characteristic tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320557720.9U CN203455467U (en) | 2013-09-09 | 2013-09-09 | Device for calibrating high-voltage switch mechanical characteristic tester |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487774A (en) * | 2013-09-09 | 2014-01-01 | 辽宁省计量科学研究院 | High-voltage switch mechanical feature tester verifying device |
| CN103869272A (en) * | 2014-03-24 | 2014-06-18 | 哈尔滨理工大学 | Calibration device for high-voltage switch dynamic characteristic tester |
| CN104122523A (en) * | 2014-07-30 | 2014-10-29 | 哈尔滨朗昇电气股份有限公司 | Circuit for testing time parameters of verifying devices for high-voltage switch testers |
| CN107816934A (en) * | 2017-12-04 | 2018-03-20 | 中国南方电网有限责任公司超高压输电公司昆明局 | A kind of breaker hydraulic disk spring mechanism disc spring decrement self-operated measuring unit |
-
2013
- 2013-09-09 CN CN201320557720.9U patent/CN203455467U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487774A (en) * | 2013-09-09 | 2014-01-01 | 辽宁省计量科学研究院 | High-voltage switch mechanical feature tester verifying device |
| CN103487774B (en) * | 2013-09-09 | 2016-06-29 | 辽宁省计量科学研究院 | High-voltage switch mechanical characteristic tester calibration equipment |
| CN103869272A (en) * | 2014-03-24 | 2014-06-18 | 哈尔滨理工大学 | Calibration device for high-voltage switch dynamic characteristic tester |
| CN104122523A (en) * | 2014-07-30 | 2014-10-29 | 哈尔滨朗昇电气股份有限公司 | Circuit for testing time parameters of verifying devices for high-voltage switch testers |
| CN104122523B (en) * | 2014-07-30 | 2017-12-01 | 哈尔滨朗昇电气运维服务有限公司 | The circuit of testing high voltage brake switch tester calibration equipment time parameter |
| CN107816934A (en) * | 2017-12-04 | 2018-03-20 | 中国南方电网有限责任公司超高压输电公司昆明局 | A kind of breaker hydraulic disk spring mechanism disc spring decrement self-operated measuring unit |
| CN107816934B (en) * | 2017-12-04 | 2024-04-09 | 中国南方电网有限责任公司超高压输电公司昆明局 | Automatic measuring device for disc spring compression amount of hydraulic disc spring mechanism of circuit breaker |
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Granted publication date: 20140226 Termination date: 20180909 |