CN104297682A

CN104297682A - Protection device for electrical life test of circuit breaker and operating mode of protection device

Info

Publication number: CN104297682A
Application number: CN201410627879.2A
Authority: CN
Inventors: 李志刚; 周俊刚; 李玲玲; 李伟
Original assignee: Hebei University of Technology
Current assignee: Hebei University of Technology
Priority date: 2014-11-10
Filing date: 2014-11-10
Publication date: 2015-01-21
Anticipated expiration: 2034-11-10
Also published as: CN104297682B

Abstract

The invention discloses a protection device for an electrical life test of a circuit breaker and an operating mode of the protection device, and relates to a testing device for a circuit breaker. The device comprises a counter, a start button, a stop button, a timer TI, a timer TII, a timer TI output contact, a timer T II output contact, a timing output contact, a TI buzzer alarm, a TII buzzer alarm, a signal source and a power supply CHI. The operating mode comprises the following steps: executing a function debugging method, to be specific, establishing three corresponding failure models, and establishing corresponding mathematical function models for the three failure models for function debugging; then, starting the electrical life test of the circuit breaker. According to the device and the operating mode, an electrical life test process of the circuit breaker can be targetedly monitored and protected in real time, so that the defects in the prior art that the electrical life test process of the circuit breaker cannot be monitored and protected and no protection measures are provided in case of failures in the test process are overcome.

Description

The electric durability test protective device of isolating switch and the method for operation thereof

Technical field

Technical scheme of the present invention relates to the proving installation of isolating switch, specifically the electric durability test protective device of isolating switch and the method for operation thereof.

Background technology

Isolating switch is widely used in industrial and agricultural production, and enterprise is every year all at research and development and production novel breaker, and product is constantly updated and regenerated.The electric durability test of isolating switch is the type approval test that state compulsion specifies to carry out, and has a large amount of isolating switchs to need to carry out electrical endurance test every year.The electric durability test of isolating switch is carried out under needing the rated voltage that provides in pilot system and rated current, and process of the test is cyclic test.According to national Specification, isolating switch " closed-to disconnect " is a circulation, to meet the isolating switch of GB10963.1, at rated voltage 400V, under rated current 63A, carry out electrical endurance test, need circulation to carry out 4000 times, frequency requirement 120 times/time, 33.3 hours whole test periods.The breaker closing time is designated as T _w, breaker opening times is designated as T _r, the electric durability test number of times of isolating switch is designated as M.Easily occur in process of the test that contact of breaker melting welding, contact of breaker fusing, contact of breaker close the various faults such as not in place, process of the test generally has testing crew viewing test phenomenon at any time at the scene, will take measures to cut off pilot system power supply if broken down and stop test.Testing crew, may non-Timeliness coverage for some fault owing to lacking experience or observing carelessness, or takes to stop test improper measures, causes heavy losses.The electric durability test of isolating switch is often, the time is long, testing crew in real time at the scene viewing test phenomenon need to consume a large amount of human cost, easily there is various fault in process of the test and to deal with danger improperly larger.

CN201110434114.3 proposes a kind of pick-up unit of magnetic switch electrical endurance, can simulate multiple test environment, thus detects the electrical endurance of magnetic switch under different simulated environment.CN201220497155.7 discloses a kind of relay contact electrical endurance test unit, comprise alternating current steady voltage plug, resistive load group and PLC test control cabinet, be in series successively by cable, simulation test can be carried out to the life-span of the actual service condition of contact.CN201110454595.4 provides a kind of machinery and electrical service life testing system, this system comprises the supply unit be made up of at least 20 cover test loops, supply unit connects distributed measurement control device, distributed measurement control device is connected with centralized control apparatus by communication bus, centralized control apparatus is connected with remote supervisory and control(ling) equipment by Ethernet, distribution accumulate system device and centralized control apparatus are connected with data storage device by communication bus, nearly 20 kinds of different tests parameters can be completed simultaneously, the machinery of 120 different test products and the measurement in lab of electrical endurance.CN201220314265.5 proposes the electric remaining life prediction unit of a kind of isolating switch, this device directly measures the closing time of isolating switch, superpotential, dropout current, ambient pressure, access times and insulating coefficient, and using these as input quantity, utilize A/D converter, processor, translation circuit, industrial computer and transport module to realize the prediction in isolating switch serviceable life.

Although above-mentioned prior art launches research from the electric life prediction aspect of electrical endurance experiment detection device, electrical service life testing system and residue to electrical endurance; but there is the monitoring and protection that lack for the electric durability test process of isolating switch, and lack the deficiency taking safeguard measure when process of the test breaks down.

Summary of the invention

Technical matters to be solved by this invention is: provide the electric durability test protective device of isolating switch and the method for operation thereof; pointedly Real-Time Monitoring and protection are carried out to the electric durability test process of isolating switch; overcome prior art and there is the monitoring and protection that lack for the electric durability test process of isolating switch, and lack the deficiency taking safeguard measure when process of the test breaks down.

The present invention solves this technical problem adopted technical scheme: the electric durability test protective device of isolating switch, comprise counter, start button, stop button, timer T I, timer T II, timer T I exports contact, timer T II exports contact, counting exports contact, T I buzzer siren, T II buzzer siren, signal source and power supply CH I, wherein, power supply CH I comprises zero line and live wire two wires, counter, timer T I and timer T II includes two groups of normally open contacts and one group of normally closed interlock respectively, signal source refers to the signal source L connection terminal and signal source N connection terminal that receive and exchange 187V-242V voltage signal, the connected mode of above-mentioned components and parts is: the live wire of power supply CH I connects the normally open contact of start button, the normally closed interlock of stop button with wired in series, then use the end of incoming cables of the solenoid of conductor in parallel linkage counter, the end of incoming cables of solenoid of timer T I and the end of incoming cables of the solenoid of timer T II, be also connected in parallel the end of incoming cables of the end of incoming cables of second group of normally open contact of timer T I, second group of normally open contact of timer T II, the leading-out terminal conductor in parallel of the leading-out terminal of the solenoid of counter, the leading-out terminal of the solenoid of timer T I and the solenoid of timer T II is connected to the zero line of power supply CH I, first group of normally open contact of counter exports the normally open contact of contact with wire connection count, one group of normally closed interlock of counter exports the normally closed interlock of contact with wire connection count, first group of normally open contact wire connection timer T I of timer T I exports the normally open contact of contact, and one group of normally closed interlock wire connection timer T I of timer T I exports the normally closed interlock of contact, first group of normally open contact wire connection timer T II of timer T II exports the normally open contact of contact, and one group of normally closed interlock wire connection timer T II of timer T II exports the normally closed interlock of contact, the end of incoming cables that leading-out terminal connects the end of incoming cables of solenoid of T I buzzer siren with wire, the leading-out terminal wire of second group of normally open contact of timer T II connects the solenoid of T II buzzer siren of second group of normally open contact of timer T I, the leading-out terminal conductor in parallel of the leading-out terminal of the solenoid of T I buzzer siren and the solenoid of T II buzzer siren is connected to the zero line of power supply CH I, forms the electric durability test protective device of isolating switch thus, operation operational relation between above-mentioned all parts is: power supply CH I provides alternating current 220V working power for the electric durability test protective device of isolating switch, when the start button is pressed, power supply CH I is above-mentioned counter, timer T I and timer T II provides working power, when stop button is pressed, cuts off the working power of above-mentioned counter, timer T I and timer T II, exchange 187V ~ 242V voltage as signal, pass to signal source sum counter simultaneously, the number of times that counter records signal occurs, the time that timer T I tracer signal exists, now timer T II automatically resets, the time that timer T II tracer signal disappears, now timer T I automatically resets, timer T I is in timing course, when timing time is less than setting-up time, timer T I exports the normally closed interlock of contact and normally open contact remains closed and off-state respectively, not for T I buzzer siren provides working power to make it can not send buzzing chimes of doom, when timing time is more than or equal to setting-up time, the normally closed interlock that timer T I exports contact disconnects, normally open contact closes, for T I buzzer siren provides working power to make it send buzzing chimes of doom, timer T II is in timing course, when timing time is less than setting-up time, timer T II exports the normally closed interlock of contact and normally open contact remains closed and off-state respectively, not for T II buzzer siren provides working power to make it can not send buzzing chimes of doom, when timing time is more than or equal to setting-up time, the normally closed interlock that timer T II exports contact disconnects, normally open contact closes, for T II buzzer siren provides working power to make it send buzzing chimes of doom, counter is in counting process, when recording number of times and being less than set point number, normally closed interlock and the normally open contact of counting output contact remain closed and off-state respectively, when recording number of times and being more than or equal to set point number, the normally closed interlock counting out contact disconnects, normally open contact closes.

The electric durability test protective device of above-mentioned isolating switch; described start button and stop button are interlocking button; isolating switch electric durability test protective device starts normal work when the start button is pressed, and when stop button is pressed, the electric durability test protective device of isolating switch stops normal work.

The electric durability test protective device of above-mentioned isolating switch, described power supply CH I is attaching plug.

The electric durability test protective device of above-mentioned isolating switch, involved components and parts are all by commercially available, and the structure of all components and parts is well known to those skilled in the art.

The method of operation of the electric durability test protective device of above-mentioned isolating switch, step is as follows:

First connected by the power supply of electric for isolating switch durability test protective device, provide alternating current 220V nominal operation power supply, whether inspection counter, timer T I, timer T II show normal, if display is normal, press start button, start function debugging; If show abnormal, check reason, investigation fault, failure cause is generally device failure, changes corresponding device, and carry out function debugging again after display is normal, the step of function debugging method is as follows:

The first step, set up corresponding failure model:

Corresponding failure model is set up for the various faults that may occur in isolating switch electric durability test process, wherein, be contingent fault in " closed-disconnect " cyclic process for isolating switch electric durability test process, set up following closed overtime model and disconnect overtime model, when meeting or exceeding stipulated number for the electric durability test number of times of isolating switch, need to cut off pilot system power supply and stop test, setting up following number of times and surmount model

1A. closes overtime model, and its corresponding fault is contact of breaker melting welding, auxiliary body is stuck causes isolating switch to remain closed for a long time causing isolating switch to be kept closed cannot disconnecting with circuit breaker handle fracture,

1B. disconnects overtime model, and its corresponding fault is contact of breaker fusing, contact of breaker closes the fracture of not in place and circuit breaker handle and causes isolating switch to remain open state cannot closing,

1C. time number surmounts model, and object is when the electric durability test number of times of isolating switch meets or exceeds stipulated number, cuts off pilot system power supply immediately and stops test;

Second step, set up corresponding mathematical function model for above-mentioned three fault models:

The mathematical function model that 2A. sets up timer T I, timer T I exports contact, T I buzzer siren is associated with closed overtime model is as follows:

2A-1. work as T _wduring < T I, timer T I exports the normally closed interlock of contact and normally open contact remains closed and off-state respectively, and T I buzzer siren does not send chimes of doom,

2A-2. work as T _wduring>=T I, timer T I exports that the normally open contact of contact is closed, normally closed interlock disconnects, and T I buzzer siren sends chimes of doom,

The mathematical function model that 2B. sets up timer T II, timer T II exports contact, T II buzzer siren is associated with the overtime model of disconnection is as follows:

2B-1. work as T _rduring < T II, timer T II exports the normally closed interlock of contact and normally open contact remains closed and off-state respectively, and T II buzzer siren does not send chimes of doom,

2B-2. work as T _rduring > T II, timer T II exports that the normally open contact of contact is closed, normally closed interlock disconnects, and T II buzzer siren sends chimes of doom,

2C. sets up counter, counting exports contact and number of times to surmount the mathematical function model that model is associated as follows:

2C-1. is as X < M, and normally closed interlock and the normally open contact of counting output contact remain closed and off-state respectively,

2C-2. is as X >=M, and the normally closed interlock of counting output contact disconnects, normally open contact closes,

Above-mentioned T _wfor the breaker closing time, T _rfor breaker opening times, M is the electric durability test number of times of counter equal number of times and isolating switch, and T I sets timing time for timer T I, and T II sets timing time for timer T II, and X is counter records number of times;

3rd step, carry out function debugging:

Power supply CH I is inserted into wall power sockets, and timer T I setting-up time is 10.00s, and timer T II setting-up time is 30.00s, and counter equal number of times is 5, prepares to carry out following function debugging:

3A. closes overtime model protection function debugging: signal source L connection terminal is connected respectively with two wires of signal source N connection terminal with band plug, be designated as CH II, insert wall 220V AC power, press start button, timer T I self-clocking, when timer T I timing display is less than 10.00s, normally closed interlock and the normally open contact of contact is exported with multimeter measuring timer T I, now timer T I exports the normally closed interlock of contact and normally open contact remains closed and off-state respectively, T I buzzer siren does not send chimes of doom, when timer T I timing display is greater than 10.00s, normally closed interlock and the normally open contact of contact is exported with multimeter measuring timer T I, now timer T I export contact normally open contact close, normally closed interlock disconnects, T I buzzer siren sends chimes of doom, press stop button, T I buzzer siren removes chimes of doom, normally closed interlock and the normally open contact of contact is exported with multimeter measuring timer T I, now timer T I exports the normally closed interlock of contact and normally open contact remains closed and off-state respectively, debug complete, this process proves that closed overtime model protection function meets design requirement,

3B. disconnects overtime model protection function debugging: the L connection terminal of signal source and the N connection terminal of signal source unsettled, press start button, timer T II self-clocking, when timer T II timing display is less than 20.00s, normally closed interlock and the normally open contact of contact is exported with multimeter measuring timer T II, now timer T II exports the normally closed interlock of contact and normally open contact remains closed and off-state respectively, T II buzzer siren does not send chimes of doom, when timer T II timing is greater than 20.00s, normally closed output and the normally open contact of contact is exported with multimeter measuring timer T II, now timer T II export contact normally open contact close, normally closed interlock disconnects, T II buzzer siren sends chimes of doom, press stop button, T II buzzer siren removes chimes of doom, normally closed interlock and the normally open contact of contact is exported with multimeter measuring timer T II, now timer T II exports the normally closed interlock of contact and normally open contact remains closed and off-state respectively, debug complete, this process proves that disconnecting overtime model protection function meets design requirement,

3C. time number surmounts model protection function debugging: be connected respectively with two wires of signal source N connection terminal with band plug by signal source L connection terminal, be designated as CH II, insert wall 220V AC power, counter hand-reset, press start button, repeatedly inserted by CH II and extract wall power, inserting and extract a circulation is 1 time; The time of inserting and extract is no more than 10.00s and 20.00s respectively, ensure closed overtime model and disconnect overtime model two kinds of situations not occur, CH II is inserted and extracts the 2nd time and the 4th time, export normally closed interlock and the normally open contact of contact by multimeter measurement count, normally closed interlock and the normally open contact of now counting output contact remain closed and off-state respectively; When CH II is inserted and extracts the 5th; normally closed interlock and the normally open contact of contact is exported by multimeter measurement count; the normally open contact of now counting output contact is closed, normally closed interlock disconnects, and debugs complete, and this process proves that number of times surmounts model protection function and meets design requirement.

After function debugging is normal, then press stop button, counter, timer T I, timer T II need to arrange M, T I, T II numerical value respectively according to test, function debugging is abnormal, then need to check reason, fix a breakdown, until debug function is normal, then signal source is connected with isolating switch, timer T II exports contact, timer T I exports contact and is connected with pilot system separating brake solenoid or the under-voltage solenoid of pilot system with counting output contact, after connection, the electric durability test of isolating switch starts, press start button simultaneously, in the electric durability test process of isolating switch, the electric durability test protective device of isolating switch starts to carry out monitoring and protecting, if broken down, T I buzzer siren or T II buzzer siren send chimes of doom, timer T II exports contact or timer T I exports contact or counting exports contact generation action, cut off pilot system power supply and stop test, testing crew hears that chimes of doom arrives in the very nick of time testing ground, press stop button to fix a breakdown in time, after pending fault is got rid of, the electric durability test of isolating switch restarts, press start button, the electric durability test protective device of isolating switch continues monitoring and protection, if do not have fault to occur, the electric durability test of isolating switch, by carrying out smoothly, finally reaches stipulated number, and the electric durability test protective device of isolating switch cuts off pilot system power supply automatically, and test completes.

The method of operation of the electric durability test protective device of above-mentioned isolating switch; the electric rated voltage of described isolating switch is 220V or 380V; for the electric durability test of isolating switch that rated voltage is not 220V or 380V; utilized by the voltage signal collected from isolating switch voltage conversion device to be converted to and exchange 187V ~ 242V voltage, as signal transmission to signal source.

The invention has the beneficial effects as follows: compared with prior art, outstanding substantive distinguishing features of the present invention and marked improvement as follows:

(1) the present invention is to fault height conclusion various in isolating switch electric durability test process, summary, summary, abstract and simplification, challenge is simplified, is convenient to take corresponding measure targetedly, tackles the fault of various energy appearance.In the electric durability test of isolating switch, in conjunction with fault that is known and prediction, induction and conclusion establishes closed overtime model, disconnection time-out model and number of times and surmounts model three fault models.

(2) the present invention is directed to above-mentioned three fault models and set up corresponding mathematical function model, under different function constraint condition, draw corresponding mathe-matical map result.The rigorous logic of applied mathematics instrument solves the difficult problem run in engineering, ensure that isolating switch electric durability test protective device design concept is more advanced and rigorous, method for designing science and practicality more, function more comprehensively and targeted.

(3) the present invention chooses an isolating switch and carries out the electric durability test of isolating switch, and test number (TN) is 4000 times, and the electric durability test protective device of isolating switch obtains practical application.In the electric durability test process of isolating switch, run into various faults, the electric durability test protective device of isolating switch is protected all effectively, reaches the design effect of expection.

(4) the present invention is not the electric durability test of isolating switch of 220V or 380V for rated voltage, is utilized by the voltage signal collected voltage conversion device to be converted to exchange 187V-242V voltage from isolating switch.Can make isolating switch electric durability test protective device like this under different voltage condition, be applied even more extensively.

(5) isolating switch of the present invention electric durability test protective device not only can be applied to the electric durability test of isolating switch, can also be applied to the electrical endurance test of the associated appliance such as A.C. contactor, relay product, be with a wide range of applications.

(6) property of the present invention is directed to Real-Time Monitoring and protection are carried out to the electric durability test process of isolating switch; overcome prior art and there is the monitoring and protection that lack for the electric durability test process of isolating switch, and lack the deficiency taking safeguard measure when process of the test breaks down.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the present invention is further described.

Fig. 1 is the schematic flow sheet of the method for operation of the electric durability test protective device of isolating switch of the present invention.

Fig. 2 is the formation schematic diagram of the electric durability test protective device of isolating switch of the present invention.

Fig. 3 is the signal source of the electric durability test protective device of isolating switch of the present invention and the wiring diagram of 1P isolating switch.

Fig. 4 is the signal source of the electric durability test protective device of isolating switch of the present invention and the wiring diagram of 1P+N isolating switch.

Fig. 5 is the signal source of the electric durability test protective device of isolating switch of the present invention and the wiring diagram of 2P isolating switch.

Fig. 6 is the signal source of the electric durability test protective device of isolating switch of the present invention and the wiring diagram of 3P isolating switch.

Fig. 7 is the signal source of the electric durability test protective device of isolating switch of the present invention and the wiring diagram of 3P+N isolating switch.

Fig. 8 is that the timer T I in the electric durability test protective device of isolating switch of the present invention exports contact, timer T II exports contact and the wiring diagram of counting output contact and pilot system separating brake solenoid.

Fig. 9 is that the timer T I in isolating switch of the present invention electric durability test protective device exports contact, timer T II exports contact and the wiring diagram of counting output contact and the under-voltage solenoid of pilot system.

In figure, 1. counter, 2. start button, 3. stop button, 4. timer T I, 5. timer T II, 6. timer T I exports contact, 7. timer T II exports contact, 8. counting exports contact, 9.T I buzzer siren, 10.T II buzzer siren, 11. signal source L connection terminals, 12. signal source N connection terminals, 13. power supply CH I, 14. isolating switchs, 15. separating brake solenoids, 16. under-voltage solenoids, 17. ground connection PE arrange, A. the A phase end of incoming cables of isolating switch, B. the B phase end of incoming cables of isolating switch, C. the C phase end of incoming cables of isolating switch, N. the N phase end of incoming cables of isolating switch, a. the A phase leading-out terminal of isolating switch, b. the B phase leading-out terminal of isolating switch, c. the C phase leading-out terminal of isolating switch, n. the N phase leading-out terminal of isolating switch, L1. the end of incoming cables of separating brake solenoid or under-voltage solenoid working power, L2. the leading-out terminal of separating brake solenoid or under-voltage solenoid working power.

Embodiment

Embodiment illustrated in fig. 1ly showing, does is the flow process of the method for operation of isolating switch of the present invention electric durability test protective device: whether power supply connection → counter, timer T I and timer T II show normal?---no → investigation fault;---be → whether press start button → function debugging result normal?---abnormal → investigation fault → complete;---normal → to press stop button → counter, timer T I, timer T II arrange M, T I respectively, T II numerical value → timer T I exports contact, timer T II exports contact, counting exports contact, signal source is connected → presses start button with outside → to have non-fault?---have → send report to the police test stop → investigation fault → on-test → press start button;---without → test and carry out → tested.

More specific description is: first connected by the power supply of electric for isolating switch durability test protective device, alternating current 220V nominal operation power supply is provided, whether normally checks counter 1, timer T I 4, timer T II 5 display, if display is normal, press start button 2, start function debugging, if show abnormal, check reason, investigation fault, failure cause is generally device failure, changes corresponding device, carries out function debugging again after display is normal, the method of function debugging as described above, function debugging is normal, then press stop button 3, counter 1, timer T I 4, timer T II 5 need to arrange M, T I, T II numerical value respectively according to test, function debugging is abnormal, then need to check reason, fix a breakdown, until debug function is normal, then timer T II is exported contact 7, timer T I exports contact 6, counting exports contact 8, signal source is connected with outside, here " outside " is pilot system separating brake solenoid, pilot system is under-voltage solenoid or isolating switch, for 220V or 380V isolating switch, Fig. 3 to Fig. 9 is shown in concrete method of attachment, connect complete, the electric durability test of isolating switch starts, press start button 2 simultaneously, in the electric durability test process of isolating switch, the electric durability test protective device of isolating switch starts to carry out monitoring and protecting, if broken down, T I buzzer siren 9 or T II buzzer siren 10 send chimes of doom, timer T II exports contact 7 or timer T I exports contact 6 or action occurs counting output contact 8, cut off pilot system power supply and stop test, testing crew hears that chimes of doom arrives in the very nick of time testing ground, press stop button 3 to fix a breakdown in time, after pending fault is got rid of, the electric durability test of isolating switch restarts, press start button 2, the electric durability test protective device of isolating switch continues monitoring and protection, if do not have fault to occur, the electric durability test of isolating switch, by carrying out smoothly, finally reaches stipulated number, and the electric durability test protective device of isolating switch cuts off pilot system power supply automatically, and test completes.

The counter 1 included by formation demonstrating the electric durability test protective device of isolating switch of the present invention embodiment illustrated in fig. 2, start button 2, stop button 3, timer T I 4, timer T II 5, timer T I exports contact 6, timer T II exports contact 7, counting exports contact 8, T I buzzer siren 9, T II buzzer siren 10 and power supply CH I 13, wherein, power supply CH I 13 comprises zero line and live wire two wires, counter 1, timer T I 4 and timer T II 5 includes two groups of normally open contacts and one group of normally closed interlock respectively, although do not show the formation components and parts signal source of this device itself in Fig. 2, but show two connection terminals of signal source, i.e. signal source L connection terminal 11 and signal source N connection terminal 12.

The connected mode of above-mentioned components and parts is: the live wire of power supply CH I 13 connects the normally open contact of start button 2, the normally closed interlock of stop button 3 with wired in series, then use the end of incoming cables of the solenoid of conductor in parallel linkage counter 1, the end of incoming cables of solenoid of timer T I 4 and the end of incoming cables of the solenoid of timer T II 5, be also connected in parallel the end of incoming cables of the end of incoming cables of second group of normally open contact of timer T I 4, second group of normally open contact of timer T II 5, the leading-out terminal conductor in parallel of the leading-out terminal of the solenoid of counter 1, the leading-out terminal of the solenoid of timer T I 4 and the solenoid of timer T II 5 is connected to the zero line of power supply CH I 13, first group of normally open contact of counter 1 exports the normally open contact of contact 8 with wire connection count, one group of normally closed interlock of counter 1 exports the normally closed interlock of contact 8 with wire connection count, first group of normally open contact wire connection timer T I of timer T I 4 exports the normally open contact of contact 6, and one group of normally closed interlock wire connection timer T I of timer T I 4 exports the normally closed interlock of contact 6, first group of normally open contact wire connection timer T II of timer T II 5 exports the normally open contact of contact 7, and one group of normally closed interlock wire connection timer T II of timer T II 5 exports the normally closed interlock of contact 7, the end of incoming cables that leading-out terminal connects the end of incoming cables of solenoid of T I buzzer siren 9 with wire, the leading-out terminal wire of second group of normally open contact of timer T II 5 connects the solenoid of T II buzzer siren 10 of second group of normally open contact of timer T I 4, the leading-out terminal conductor in parallel of the leading-out terminal of the solenoid of T I buzzer siren 9 and the solenoid of T II buzzer siren 10 is connected to the zero line of power supply CH I 13, forms the electric durability test protective device of isolating switch thus, operation operational relation between above-mentioned all parts is: power supply CH I 13 provides alternating current 220V working power for the electric durability test protective device of isolating switch, when start button 2 is pressed, for above-mentioned counter 1, timer T I 4, timer T II 5 provide working power, when stop button 3 is pressed, cut off the working power of above-mentioned counter 1, timer T I 4, timer T II 5, exchange 187V ~ 242V voltage as signal, pass to signal source sum counter simultaneously, the number of times that counter records signal occurs, the time that timer T I 4 tracer signal exists, now timer T II 5 automatically resets, the time that timer T II 5 tracer signal disappears, now timer T I 4 automatically resets, timer T I 4 is in timing course, when timing time is less than setting-up time, timer T I exports the normally closed interlock of contact 6 and normally open contact remains closed and off-state respectively, not for T I buzzer siren 9 provides working power to make it can not send buzzing chimes of doom, when timing time is more than or equal to setting-up time, the normally closed interlock that timer T I exports contact 6 disconnects, normally open contact closes, for T I buzzer siren 9 provides working power to make it send buzzing chimes of doom, timer T II 5 is in timing course, when timing time is less than setting-up time, timer T II exports the normally closed interlock of contact 7 and normally open contact remains closed and off-state respectively, not for T II buzzer siren 10 provides working power to make it can not send buzzing chimes of doom, when timing time is more than or equal to setting-up time, the normally closed interlock that timer T II exports contact 7 disconnects, normally open contact closes, for T II buzzer siren 10 provides working power to make it send buzzing chimes of doom, counter 1 is in counting process, when recording number of times and being less than set point number, normally closed interlock and the normally open contact of counting output contact 8 remain closed and off-state respectively, when recording number of times and being more than or equal to set point number, the normally closed interlock counting out contact 8 disconnects, normally open contact closes.

Counter 1, timer T I 4 and timer T II 5 is digital display screen, can observe the process of Monitoring Data display and change in process of the test intuitively, Real-Time Monitoring dynamic change.The optimum configurations of counter 1, timer T I 4 and timer T II 5 is dial-up form, and mode of operation is simply direct, and testing crew as requested manual dial-up realizes the setting of parameter M, T I and T II.Timer T II exports contact 7, T II buzzer siren 10 and timer T II 5 cooperating; Timer T I exports contact 6, T I buzzer siren 9 and timer T I 4 cooperating; Counting exports contact 8 and counter 1 cooperating; The signal source L connection terminal 11 and the signal source N connection terminal 12 that receive interchange 187V-242V voltage signal form signal source, for the electric durability test protective device of isolating switch provides input signal; Power supply CH I 13 is alternating current 220V working power.

More specifically illustrate that the principle of work of isolating switch of the present invention electric durability test protective device is: described power supply CH I 13 is attaching plug, is plugged on alternating current 220V wall power sockets, for the electric durability test protective device of isolating switch provides working power.Described start button 2 and stop button 3 are interlocking button, and when start button 2 is pressed, stop button 3 is upspring, isolating switch electric durability test protective device starting protection function; When stop button 3 is pressed, start button 2 is upspring, and the electric durability test protective device of isolating switch stops defencive function.Described signal source, using the alternating voltage within the scope of 187-242V as input signal, input signal can as the duty trigger pip of counter 1, timer T I 4, timer T II 5.Described counter 1 has two kinds of functions, and first: the electric durability test number of times of isolating switch is recorded and shown, is designated as X; Second: setting counter stipulated number is M, as X < M, normally closed interlock and the normally open contact of counting output contact 8 remain closed and off-state respectively; As X >=M, the normally closed interlock of counting output contact 8 disconnects, normally open contact closes.Described timer T I 4 is used to monitor T _wvalue, setting timing time T I=1.2T _w.T when test is normally carried out _w< T I, timer T I export the normally closed interlock of contact 6 and normally open contact remains closed and off-state respectively, and T I buzzer siren 9 does not send chimes of doom; T when test is broken down _w>=T I, timer T I export contact 6 normally closed interlock disconnect, normally open contact close, T I buzzer siren 9 sends chimes of doom.Described timer T II 5 is used to monitor T _rvalue, setting timing time T II=1.2T _r.T when test is normally carried out _r< T II, timer T II export the normally closed interlock of contact 7 and normally open contact remains closed and off-state respectively, and T II buzzer siren 10 does not send chimes of doom; T when test is broken down _r>=T II, timer T II export contact 7 normally closed interlock disconnect, normally open contact close, T II buzzer siren 10 sends chimes of doom.Counter 1 automatically record display source signal send the number of times of signal.Be interlocked relationship between timer T I 4 and timer T II 5, when timer T I 4 timework, timer T II 5 automatically resets and hold reset state; When timer T II 5 timework, timer T I 4 automatically resets and hold reset state.

Above-mentioned electronic devices and components are the electronic devices and components that market is often used, buy and easy to use, be convenient to popularization of the present invention and maintenance maintenance.

The signal source of apparatus of the present invention embodiment illustrated in fig. 3 and the wiring diagram of 1P isolating switch 14 show, signal source L connection terminal 11 is connected with the A phase leading-out terminal a of isolating switch, and signal source N connection terminal 12 and ground connection PE arrange 17 and be connected, and the A phase end of incoming cables A of isolating switch is vacant.In the electric durability test process of isolating switch when breaker closing, the alternating voltage between signal source L connection terminal 11 and signal source N connection terminal 12 within 187V ~ 242V, as signal transmission to signal source.The formation of the isolating switch electric durability test protective device of the present embodiment is with described in embodiment illustrated in fig. 2.

The signal source of apparatus of the present invention embodiment illustrated in fig. 4 and the wiring diagram of 1P+N isolating switch 14 show, signal source L connection terminal 11 is connected with the A phase leading-out terminal a of isolating switch, signal source N connection terminal 12 is connected with the N phase leading-out terminal n of isolating switch, and the A phase end of incoming cables A of isolating switch and the N phase end of incoming cables N of isolating switch is vacant.In the electric durability test process of isolating switch when breaker closing, the alternating voltage between signal source L connection terminal 11 and signal source N connection terminal 12 within 187V ~ 242V, as signal transmission to signal source.The formation of the isolating switch electric durability test protective device of the present embodiment is with described in embodiment illustrated in fig. 2.

The signal source of apparatus of the present invention embodiment illustrated in fig. 5 and the wiring diagram of 2P isolating switch 14 show, signal source L connection terminal 11 is connected with the A phase leading-out terminal a of isolating switch, signal source N connection terminal 12 and ground connection PE arrange 17 and are connected, and the B phase leading-out terminal b of the A phase end of incoming cables A of isolating switch, the B phase end of incoming cables B of isolating switch and isolating switch is vacant.In the electric durability test process of isolating switch when breaker closing, the alternating voltage between signal source L connection terminal 11 and signal source N connection terminal 12 within 187V ~ 242V, as signal transmission to signal source.The formation of the isolating switch electric durability test protective device of the present embodiment is with described in embodiment illustrated in fig. 2.

The signal source of apparatus of the present invention embodiment illustrated in fig. 6 and the wiring diagram of 3P isolating switch 14 show, signal source L connection terminal 11 is connected with the A phase leading-out terminal a of isolating switch, signal source N connection terminal 12 and ground connection PE arrange 17 and are connected, and the C phase leading-out terminal c of the B phase leading-out terminal b of the A phase end of incoming cables A of isolating switch, the B phase end of incoming cables B of isolating switch, isolating switch, the C phase end of incoming cables C of isolating switch and isolating switch is vacant.In the electric durability test process of isolating switch when breaker closing, the alternating voltage between signal source L connection terminal 11 and signal source N connection terminal 12 within 187V ~ 242V, as signal transmission to signal source.The formation of the isolating switch electric durability test protective device of the present embodiment is with described in embodiment illustrated in fig. 2.

The signal source of apparatus of the present invention embodiment illustrated in fig. 7 and the wiring diagram of 3P+N isolating switch 14 show, signal source L connection terminal 11 is connected with the A phase leading-out terminal a of isolating switch, signal source N connection terminal 12 is connected with the N phase leading-out terminal n of isolating switch, and the N phase end of incoming cables N of B phase leading-out terminal b, the C phase end of incoming cables C of isolating switch of the A phase end of incoming cables A of isolating switch, the B phase end of incoming cables B of isolating switch, isolating switch, the C phase leading-out terminal c of isolating switch and isolating switch is vacant.In the electric durability test process of isolating switch when breaker closing, the alternating voltage between signal source L connection terminal 11 and signal source N connection terminal 12 within 187V ~ 242V, as signal transmission to signal source.The formation of the isolating switch electric durability test protective device of the present embodiment is with described in embodiment illustrated in fig. 2.

The mode of connection that the timer T I of display apparatus of the present invention embodiment illustrated in fig. 8 exports contact 6, timer T II exports contact 7, counting exports the separating brake solenoid 15 of contact 8 and pilot system main circuit breaker.Pilot system by control of main circuit breaker for distribution, when breaking down in the electric durability test process of isolating switch, needing to disconnect main circuit breaker in time, can cut off pilot system power supply like this.It is a kind of way of main circuit breaker disjunction to separating brake solenoid 15 energising.One end of separating brake solenoid 15 connects the end of incoming cables L1 of separating brake solenoid working power, the other end is connected in parallel that timer T I exports contact 6, timer T II exports contact 7 and counting exports one end of the normally open contact of contact 8, and the other end that timer T I exports contact 6, timer T II exports contact 7 and counting exports the normally open contact of contact 8 is connected in parallel the leading-out terminal L2 of separating brake solenoid working power.When breaking down in the electric durability test process of isolating switch, timer T II exports the normally open contact that contact 7 or timer T I export contact 6 and closes, separating brake solenoid 15 is energized, main circuit breaker is caused to disconnect, T II buzzer siren 10 or T I buzzer siren 9 can send chimes of doom, prompting testing crew breaks down, and arrive in the very nick of time on site fault clearing.When the electric durability test of isolating switch reaches secondary N number, the normally open contact that counting exports contact 8 closes, and separating brake solenoid 15 is energized, and main circuit breaker disconnects.The formation of the isolating switch electric durability test protective device of the present embodiment is with described in embodiment illustrated in fig. 2.

The timer T I of display apparatus of the present invention embodiment illustrated in fig. 9 exports and touches, and 6, timer T II exports contact 7, counting exports contact 8 and the under-voltage solenoid 16 of pilot system main circuit breaker the mode of connection.Pilot system by control of main circuit breaker for distribution, when breaking down in the electric durability test process of isolating switch, needing to disconnect main circuit breaker in time, can cut off pilot system power supply like this.It is the another kind of way of main circuit breaker disjunction to the power-off of under-voltage solenoid 16.One end of under-voltage solenoid 16 connects the end of incoming cables L1 of under-voltage solenoid working power, the other end is connected in parallel that timer T I exports contact 6, timer T II exports contact 7 and counting exports one end of the normally open contact of contact 8, and the other end that timer T I exports contact 6, timer T II exports contact 7 and counting exports the normally open contact of contact 8 is connected in parallel the leading-out terminal L2 of under-voltage solenoid working power.When breaking down in the electric durability test process of isolating switch, timer T II exports the normally closed interlock that contact 7 or timer T I export contact 6 and disconnects, the power-off of under-voltage solenoid 16, main circuit breaker is caused to disconnect, T II buzzer siren 10 or T I buzzer siren 9 can send chimes of doom, prompting testing crew breaks down, and arrive in the very nick of time on site fault clearing.When the electric durability test of isolating switch reaches test number (TN), the normally closed interlock that counting exports contact 8 disconnects, the power-off of under-voltage solenoid 16, and main circuit breaker disconnects.The formation of the isolating switch electric durability test protective device of the present embodiment is with described in embodiment illustrated in fig. 2.

Embodiment 1

The formation of the electric durability test protective device of isolating switch of the present embodiment comprises counter 1, start button 2, stop button 3, timer T I 4, timer T II 5, timer T I exports contact 6, timer T II exports contact 7, counting exports contact 8, T I buzzer siren 9, T II buzzer siren 10, signal source and power supply CH I 13, counter 1, timer T I 4 and timer T II 5 includes two groups of normally closed interlocks and normally open contact respectively, signal source refers to the signal source L connection terminal 11 and signal source N connection terminal 12 that receive and exchange 187V-242V voltage signal, power supply CH I 13 is attaching plug, it comprises zero line and live wire two wires, described start button 2 and stop button 3 are interlocking button, when start button starts normal work by isolating switch electric durability test protective device when 2 times, when stop button 3 is pressed, the electric durability test protective device of isolating switch stops normal work.All parts are according to the electric durability test protective device of the isolating switch that composition embodiment illustrated in fig. 2 is complete.

The electric durability test protective device of the present embodiment isolating switch, involved components and parts are all by commercially available.

By electric for the isolating switch of the present embodiment durability test protective device according in above-mentioned access test circuit embodiment illustrated in fig. 3 ~ embodiment illustrated in fig. 9, carry out the operation of the electric durability test protective device of this isolating switch, step is as follows:

First the power supply of electric for isolating switch durability test protective device is connected, alternating current 220V nominal operation power supply is provided, whether normally to check counter 1, timer T I 4, timer T II 5 display, if display is normal, press start button 2, start function debugging; If show abnormal, check reason, investigation fault, failure cause is generally device failure, changes corresponding device, and carry out function debugging again after display is normal, the step of the method for function debugging is as follows:

The first step, set up corresponding failure model:

The mathematical function model that 2A. sets up timer T I 4, timer T I exports contact 6, T I buzzer siren 9 is associated with closed overtime model is as follows:

2A-1. work as T _wduring < T I, timer T I exports the normally closed interlock of contact 6 and normally open contact remains closed and off-state respectively, and T I buzzer siren 9 does not send chimes of doom,

2A-2. work as T _wduring>=T I, the normally open contact that timer T I exports contact 6 closes, and normally closed interlock disconnects, and T I buzzer siren 9 sends chimes of doom,

The mathematical function model that 2B. sets up timer T II 5, timer T II exports contact 7, T II buzzer siren 10 is associated with the overtime model of disconnection is as follows:

2B-1. work as T _rduring < T II, timer T II exports the normally closed interlock of contact 7 and normally open contact remains closed and off-state respectively, and T II buzzer siren 10 does not send chimes of doom,

2B-2. work as T _rduring > T II, timer T II exports that the normally open contact of contact 7 is closed, normally closed interlock disconnects, and T II buzzer siren 10 sends chimes of doom,

2C. sets up counter 1, counting exports contact 8 and number of times to surmount the mathematical function model that model is associated as follows:

2C-1. is as X < M, and normally closed interlock and the normally open contact of counting output contact 8 remain closed and off-state respectively,

2C-2. is as X >=M, and the normally closed interlock of counting output contact 8 disconnects, normally open contact closes,

Above-mentioned T _wfor the breaker closing time, T _rfor breaker opening times, M is the electric durability test number of times of counter equal number of times and isolating switch, and T I is that timer T I 4 sets timing time, and T II is that timer T II 5 sets timing time, and X is that counter 1 records number of times;

3rd step, carry out function debugging:

Power supply CH I 13 is inserted into wall power sockets, and timer T I 4 setting-up time is 10.00s, and timer T II 5 setting-up time is 30.00s, and counter 1 set point number is 5, prepares to carry out following function debugging:

3A. closes overtime model protection function debugging: signal source L connection terminal 11 is connected respectively with two wires of signal source N connection terminal 12 with band plug, be designated as CH II, insert wall 220V AC power, press start button, timer T I 4 self-clocking, when timer T I 4 timing display is less than 10.00s, normally closed interlock and the normally open contact of contact is exported with multimeter measuring timer T I, now timer T I exports the normally closed interlock of contact 6 and normally open contact remains closed and off-state respectively, T I buzzer siren 9 does not send chimes of doom, when timer T I 4 timing display is greater than 10.00s, normally closed interlock and the normally open contact of contact 6 is exported with multimeter measuring timer T I, now timer T I export contact 6 normally open contact close, normally closed interlock disconnects, T I buzzer siren 9 sends chimes of doom, press stop button, T I buzzer siren 9 removes chimes of doom, normally closed interlock and the normally open contact of contact 6 is exported with multimeter measuring timer T I, now timer T I exports the normally closed interlock of contact 6 and normally open contact remains closed and off-state respectively, debug complete, this process proves that closed overtime model protection function meets design requirement,

3B. disconnects overtime model protection function debugging: signal source L connection terminal 11 and signal source N connection terminal 12 unsettled, press start button, timer T II 5 self-clocking, when timer T II 5 timing display is less than 20.00s, normally closed interlock and the normally open contact of contact 7 is exported with multimeter measuring timer T II, now timer T II exports the normally closed interlock of contact 7 and normally open contact remains closed and off-state respectively, T II buzzer siren 10 does not send chimes of doom, when timer T II 5 timing is greater than 20.00s, normally closed output and the normally open contact of contact 7 is exported with multimeter measuring timer T II, now timer T II export contact 7 normally open contact close, normally closed interlock disconnects, T II buzzer siren 10 sends chimes of doom, press stop button, T II buzzer siren 10 removes chimes of doom, normally closed interlock and the normally open contact of contact 7 is exported with multimeter measuring timer T II, now timer T II exports the normally closed interlock of contact 7 and normally open contact remains closed and off-state respectively, debug complete, this process proves that disconnecting overtime model protection function meets design requirement,

3C. time number surmounts model protection function debugging: be connected respectively with two wires of signal source N connection terminal 12 with band plug by signal source L connection terminal 11, be designated as CH II, insert wall 220V AC power, counter hand-reset, press start button, repeatedly inserted by CH II and extract wall power, inserting and extract a circulation is 1 time; The time of inserting and extract is no more than 10.00s and 20.00s respectively, ensure closed overtime model and disconnect overtime model two kinds of situations not occur, CH II is inserted and extracts the 2nd time and the 4th time, export normally closed interlock and the normally open contact of contact 8 by multimeter measurement count, normally closed interlock and the normally open contact of now counting output contact 8 remain closed and off-state respectively; When CH II is inserted and extracts the 5th; normally closed interlock and the normally open contact of contact 8 is exported by multimeter measurement count; the normally open contact of now counting output contact 8 is closed, normally closed interlock disconnects, and debugs complete, and this process proves that number of times surmounts model protection function and meets design requirement.

After function debugging is normal, then press stop button 3, counter 1, timer T I 4, timer T II 5 need to arrange M, T I, T II numerical value respectively according to test, function debugging is abnormal, then need to check reason, fix a breakdown, until debug function is normal, then timer T II is exported contact 7, timer T I exports contact 6, counting exports contact 8, signal source is connected with outside, for 220V or 380V isolating switch, Fig. 3 to Fig. 9 is shown in concrete method of attachment, connect complete, the electric durability test of isolating switch starts, press start button 2 simultaneously, in the electric durability test process of isolating switch, the electric durability test protective device of isolating switch starts to carry out monitoring and protecting, if broken down, T I buzzer siren 9 or T II buzzer siren 10 send chimes of doom, timer T II exports contact 7 or timer T I exports contact 6 or action occurs counting output contact 8, cut off pilot system power supply and stop test, testing crew hears that chimes of doom arrives in the very nick of time testing ground, press stop button 3 to fix a breakdown in time, after pending fault is got rid of, the electric durability test of isolating switch restarts, press start button 2, the electric durability test protective device of isolating switch continues monitoring and protection, if do not have fault to occur, the electric durability test of isolating switch, by carrying out smoothly, finally reaches stipulated number, and the electric durability test protective device of isolating switch cuts off pilot system power supply automatically, and test completes.

The method of operation of the electric durability test protective device of isolating switch of the present embodiment; the electric rated voltage of described isolating switch is 220V or 380V; for the electric durability test of isolating switch that rated voltage is not 220V or 380V, utilized by the voltage signal collected from isolating switch voltage conversion device to be converted to and exchange 187V ~ 242V voltage.

Claims

1. the electric durability test protective device of isolating switch, it is characterized in that: comprise counter, start button, stop button, timer T I, timer T II, timer T I exports contact, timer T II exports contact, counting exports contact, T I buzzer siren, T II buzzer siren, signal source and power supply CH I, wherein, power supply CH I comprises zero line and live wire two wires, counter, timer T I and timer T II includes two groups of normally open contacts and one group of normally closed interlock respectively, signal source refers to the signal source L connection terminal and signal source N connection terminal that receive and exchange 187V-242V voltage signal, the connected mode of above-mentioned components and parts is: the live wire of power supply CH I connects the normally open contact of start button, the normally closed interlock of stop button with wired in series, then use the end of incoming cables of the solenoid of conductor in parallel linkage counter, the end of incoming cables of solenoid of timer T I and the end of incoming cables of the solenoid of timer T II, be also connected in parallel the end of incoming cables of the end of incoming cables of second group of normally open contact of timer T I, second group of normally open contact of timer T II, the leading-out terminal conductor in parallel of the leading-out terminal of the solenoid of counter, the leading-out terminal of the solenoid of timer T I and the solenoid of timer T II is connected to the zero line of power supply CH I, first group of normally open contact of counter exports the normally open contact of contact with wire connection count, one group of normally closed interlock of counter exports the normally closed interlock of contact with wire connection count, first group of normally open contact wire connection timer T I of timer T I exports the normally open contact of contact, and one group of normally closed interlock wire connection timer T I of timer T I exports the normally closed interlock of contact, first group of normally open contact wire connection timer T II of timer T II exports the normally open contact of contact, and one group of normally closed interlock wire connection timer T II of timer T II exports the normally closed interlock of contact, the end of incoming cables that leading-out terminal connects the end of incoming cables of solenoid of T I buzzer siren with wire, the leading-out terminal wire of second group of normally open contact of timer T II connects the solenoid of T II buzzer siren of second group of normally open contact of timer T I, the leading-out terminal conductor in parallel of the leading-out terminal of the solenoid of T I buzzer siren and the solenoid of T II buzzer siren is connected to the zero line of power supply CH I, forms the electric durability test protective device of isolating switch thus, operation operational relation between above-mentioned all parts is: power supply CH I provides alternating current 220V working power for the electric durability test protective device of isolating switch, when the start button is pressed, power supply CH I is above-mentioned counter, timer T I and timer T II provides working power, when stop button is pressed, cuts off the working power of above-mentioned counter, timer T I and timer T II, exchange 187V ~ 242V voltage as signal, pass to signal source sum counter simultaneously, the number of times that counter records signal occurs, the time that timer T I tracer signal exists, now timer T II automatically resets, the time that timer T II tracer signal disappears, now timer T I automatically resets, timer T I is in timing course, when timing time is less than setting-up time, timer T I exports the normally closed interlock of contact and normally open contact remains closed and off-state respectively, not for T I buzzer siren provides working power to make it can not send buzzing chimes of doom, when timing time is more than or equal to setting-up time, the normally closed interlock that timer T I exports contact disconnects, normally open contact closes, for T I buzzer siren provides working power to make it send buzzing chimes of doom, timer T II is in timing course, when timing time is less than setting-up time, timer T II exports the normally closed interlock of contact and normally open contact remains closed and off-state respectively, not for T II buzzer siren provides working power to make it can not send buzzing chimes of doom, when timing time is more than or equal to setting-up time, the normally closed interlock that timer T II exports contact disconnects, normally open contact closes, for T II buzzer siren provides working power to make it send buzzing chimes of doom, counter is in counting process, when recording number of times and being less than set point number, normally closed interlock and the normally open contact of counting output contact remain closed and off-state respectively, when recording number of times and being more than or equal to set point number, the normally closed interlock counting out contact disconnects, normally open contact closes.

2. the electric durability test protective device of isolating switch according to claim 1; it is characterized in that: described start button and stop button are interlocking button; isolating switch electric durability test protective device starts normal work when the start button is pressed, and when stop button is pressed, the electric durability test protective device of isolating switch stops normal work.

3. the method for operation of the electric durability test protective device of isolating switch described in claim 1, is characterized in that step is as follows:

The first step, set up corresponding failure model:

3rd step, carry out function debugging:

4. the method for operation of the electric durability test protective device of isolating switch according to claim 3; it is characterized in that: the electric rated voltage of described isolating switch is 220V or 380V; for the electric durability test of isolating switch that rated voltage is not 220V or 380V, utilized by the voltage signal collected from isolating switch voltage conversion device to be converted to and exchange 187V ~ 242V voltage.