CN204964703U - Naked switch motion characteristic of transformer on -load tap -changer exchanges testing arrangement - Google Patents

Abstract

The utility model provides a naked switch motion characteristic of transformer on -load tap -changer exchanges testing arrangement, belongs to transformer switch technology field. The utility model aims at providing a to the naked switch motion characteristic of transformer on -load tap -changer exchanges testing arrangement who carries out the operating characteristic alternating -current measurement in the naked switch of on -load tap -changer. The utility model discloses a testing arrangement is: at first insert the 220V electric main through the P1 interface, in sending into transformer T1 and AC -DC conversion chip behind the switch S1 respectively, 5, 6 pins of IN interface, 3, 4 pins, 1, 2 pins are external to concatenate with the output of the naked switch A looks of on -load tap -changer, B looks, C looks respectively to output interface configuration resistance R at the every looks operating circuit of naked switch, internally be connected to current sensor S1, S2, S3's 1, 2 pins of input respectively, current sensor S1, S2, S3 correspond A looks, B looks, the C looks of the naked switch of on -load tap -changer respectively. The utility model discloses to the naked switch of the on -load tap -changer who does not take transformer winding, discover and judge the not enough scheduling problem of switch contact contact force, improve test effectiveness and efficiency, effectively prevent electric wire netting owner equipment scaling loss accident.

Description

On-load tap changers of transformers naked switch action characteristic alternating-current measurement device

Technical field

The utility model belongs to transformer switch technical field.

Background technology

Power transformer is as one of major equipment in electric system, and its duty is related to the security of operation of whole electric system.The later stage eighties in last century, China started to use ULTC in electrical network, powered with the variable no-load voltage ratio realizing transformer, was the electric power resource that user provides quality of voltage qualified.At present, national power supply network ULTC has accounted for more than 90% of transformer sum, and the Accident of Transformer caused by on-load tap changers of transformers also straight line rises, and directly causes transformer to burn, the reliability of impact power supply.So become one of important content determining electric power system stability for the detection of on-load tap changers of transformers acting characteristic.

The domestic device for on-load tap changers of transformers acting characteristic alternating-current measurement has one section of patented technology (patent No. ZL200910066429.X), can find out that from its specific implementation process it is the detection to the load ratio bridging switch acting characteristic to band transformer, and can realize carrying out the test of shunting switch acting characteristic to high pressure winding at the transformer of all tie lines ranks of primary side, secondary side, comprise that Y tie lines neutral point is not drawn, Δ tie lines transformer, and single transformer, reactor.Its shunting switch mainly with Transformer Winding, because the existence of winding, when alternating current, a very large impedance is had in circuit, so very large three-phase alternating voltage value will be added during test, power supply aspect is required just higher, even if but measured like this current value is also only milliampere level, also relatively difficult in the precision of acquisition and processing.

And other alternating-current measurement device, on the one hand, testing apparatus volume is large, and integrated level is not high, and measuring accuracy is poor; On the other hand, test process manual operation is more, and automaticity is little, and operating process is complicated.This just has higher requirement for the alternating-current measurement of the naked switch of load ratio bridging switch.

Summary of the invention

The purpose of this utility model is to provide and is a kind ofly directed to the on-load tap changers of transformers naked switch action characteristic alternating-current measurement device that the naked switch of load ratio bridging switch carries out acting characteristic alternating-current measurement.

Proving installation of the present utility model is:

A, first by 220V electric main through P1 interface access, send in transformer T1 and AC-DC conversion chip after switch S 1 respectively;

1. transformer T1 directly exports 45V alternating voltage on the threephase switch of the naked switch of P2 interface supply load ratio bridging switch;

2. AC-DC power conversion chip accesses 220V alternating current by pin 1 and pin 3, + 12V the DC voltage of pin 2 stable output, pin 4 is GND end, then by+12V DC voltage access DC-DC conversion chip pin 1, GND receives on chip pin 2,3,4 pins of DC-DC conversion chip respectively stable outputs ± 12V DC voltage, 5 pins are GND end;

5,6 pins of b, IN interface, 3,4 pins, the output terminal of 1,2 pins external switch A phase naked with load ratio bridging switch, B phase, C phase is respectively connected in series, and configures resistance R at the output interface of the every phase operating circuit of naked switch; Internally be connected respectively to input end 1,2 pin of current sensor S1, S2, S3, A phase, B phase, the C phase of the naked switch of current sensor S1, S2, S3 corresponding load ratio bridging switch of difference, current sensor 3 pin connects the GND end of direct current power source portion, 4 pins meet the+12V of direct supply, 5 pins meet-12V, 6 pins are the output terminal of current sensor, and the output of No. three current sensors is accessed capture card through OUT.

The utility model is for the naked switch of the load ratio bridging switch not with Transformer Winding, find and judge that switch contact contact is not enough, contact is bad, transition resistance connects and the defect such as wire contacts is bad, transition resistance broken string, can the high-precision measuring shunting switch three-phase asynchronous time, shunting switch bridging time, improve test effect and efficiency, effectively prevent electrical network main equipment burning damage accident.The utility model has the advantage of:

The light portable of device, main frame volume is little, lightweight, and disposal system adopts notebook computer mode, facilitates site test and labor on the spot;

Device is simple to operate, can automatically record tap joint position and direction, complete the test of all taps in a few minutes fast in process of the test;

Measurement device precision is high, and the waveform duration of record can reach 500ms, and the overall process (in usual 100-300ms) that all standing shunting switch terminates from any contact action to contact action, can analyze switching over overall process;

Device is resolved unique to the naked switch AC test waveform of on-load tap changers of transformers, can well solve test waveform in DC test without level, the interrupted and problem of jumping;

Test waveform data can be attached in JPG picture, are convenient to transmit in report file, and JPG picture of can performing fighting carries out Full wave shape data secondary analysis;

Routine analyzer can generate clear report picture under Report mode, need not adjust and just can be used for word document stickup, the automatic marking period, and data file is attached containing test relevant information, is convenient to filing and consults.

Accompanying drawing explanation

Fig. 1 is the naked switch test device power supply diagram of the utility model load ratio bridging switch;

Fig. 2 is the naked Switch Three-Phase current sensor circuit figure of the utility model load ratio bridging switch;

Fig. 3 is constitutional diagram before single-phase adjustment in the naked Switch Three-Phase of the utility model load ratio bridging switch;

Fig. 4 is constitutional diagram in single-phase adjustment in the naked Switch Three-Phase of the utility model load ratio bridging switch;

Fig. 5 is constitutional diagram after single-phase adjustment in the naked Switch Three-Phase of the utility model load ratio bridging switch;

Fig. 6 is single-phase adjustment process circuitous resistance variation diagram in the naked Switch Three-Phase of the utility model load ratio bridging switch;

Fig. 7 is the naked switch wire connection block diagram of the utility model load ratio bridging switch, can find out in figure, is configured with resistance R at the output terminal of the naked switch of existing load ratio bridging switch;

Fig. 8 is loaded switch naked switch AC test waveform normal condition schematic diagram;

Fig. 9 is that loaded switch naked switch simulation A phase disconnects AC wave shape test schematic diagram.

Embodiment

The utility model proving installation is:

A, first by 220V electric main through P1 interface access, send in transformer T1 and AC-DC conversion chip after switch S 1 respectively;

1. transformer T1 directly exports 45V alternating voltage on the threephase switch of the naked switch of P2 interface supply load ratio bridging switch;

2. AC-DC power conversion chip accesses 220V alternating current by pin 1 and pin 3, + 12V the DC voltage of pin 2 stable output, pin 4 is GND end, then by+12V DC voltage access DC-DC conversion chip pin 1, GND receives on chip pin 2,3,4 pins of DC-DC conversion chip respectively stable outputs ± 12V DC voltage, 5 pins are GND end;

5,6 pins of b, IN interface, 3,4 pins, the output terminal of 1,2 pins external switch A phase naked with load ratio bridging switch, B phase, C phase is respectively connected in series, and configures resistance R at the output interface of the every phase operating circuit of naked switch; Internally be connected respectively to input end 1,2 pin of current sensor S1, S2, S3, A phase, B phase, the C phase of the naked switch of current sensor S1, S2, S3 corresponding load ratio bridging switch of difference, current sensor 3 pin connects the GND end of direct current power source portion, 4 pins meet the+12V of direct supply, 5 pins meet-12V, 6 pins are the output terminal of current sensor, and the output of No. three current sensors is accessed capture card through OUT.

Below in conjunction with accompanying drawing, further detailed description is done to the utility model:

There is no winding in circuit in the naked switch of load ratio bridging switch, be equivalent to the state of short circuit, so be very different in input power size and current acquisition.Owing to not having resistive interference, circuit is equivalent to short-circuit condition, just has a larger electric current, will be connected in series into resistance, prevent electric current excessive during test to a little alternating voltage; And due to the difference of Transformer Winding group, under identical shunting switch fault, the current waveform presented is inconsistent, may judges by accident shunting switch because of the impact of winding, relatively understand more complicated.So detect in occasion in reality, separately the naked switch of load ratio bridging switch is detected, the interference that Transformer Winding is brought can be got rid of, be conducive to the judgement of testing result.Also only need to test the naked switch of load ratio bridging switch many times, as produced the production firm etc. of the naked switch of shunting switch, so just necessary for the research of on-load tap changers of transformers naked switch AC test simultaneously.

The utility model is by the present computer technology, high speed information acquisition and process is applied to the alternating-current measurement of the naked switch action characteristic of on-load tap changers of transformers, adopt industrial frequency AC method of testing, the electric current of each 10 the cycle length in both sides centered by well-documented history bridge joint in shunting switch switches starts, voltage data, the current transients point produced in accurate response switch motion process, record test data also carries out comparative analysis, background analysis software can provide data refinement analytic function, the duty of each contact of switching over process breaker in middle of accurate judgement 40ms ~ 60ms, find and judge that tapping switch contact contact is not enough, contact is bad, transition resistance connect and wire contacts bad, the defects such as transition resistance broken string, the high-precision measuring shunting switch three-phase asynchronous time, shunting switch bridging time, find and judge the defect that shunting switch exists.

Power-supply system part: power-supply system does two process, one be the 220V Power convert of just input single-phase is single-phase 45V alternating voltage, exports in the naked Switch Three-Phase switch of load ratio bridging switch to be tested respectively; Two is 220V electric main is AC-DC be converted to+12V DC voltage, for host apparatus inside corresponding module is powered, due to the AC signal that sensor gathers, needs ± 12V voltage, so+12V voltage is changed out ± 12V voltage through DC-DC modular converter, it is sensor power.Device main frame provides power supply wiring.

Information acquisition part: adopt high-precision AC current sensor, adopts 8 Channel Synchronous without the data acquisition modes of difference, high speed acquisition simultaneously, waveform recording total length of time is: 200-500ms, minimum resolution is about 50us, gathers the data precision of returning high, meets the requirement of data processing.

Data processing section: data handling system is notebook computer.Couple together with the information acquisition module of USB on line by computer and device during test, enter master routine interface after booting computer, fill in corresponding detecting information successively, select data to preserve position, enter data processor interface.In this process, test can be carried out automatically, and screen directly shows the waveform change of shunting switch course of action, and data are preserved automatically, can regulate viewing area range simultaneously, be convenient to better observation; After test process, there is omnidistance recovering and analysis function, by the data waveform playback again of record, contribute to determining test result better; After analysis terminates, routine analyzer generates and reports picture clearly under Report mode, need not adjust and just can be used for word document stickup, the automatic marking period simultaneously, data file is attached containing test relevant information, and be convenient to filing and consult, test waveform data are attached in JPG picture, be convenient to transmit in report file, also can open JPG picture and carry out Full wave shape data secondary analysis.Whole process operation is simple, and have corresponding explanatory note in program, function is very clear.

In reality test, control at 0 ~ 75Vac by the input supply voltage of shunting switch, output current controls in 0 ~ 5Vdc scope, no matter like this for power supply process aspect or the acquisition process for electric current, all relatively simple.

Circuit connecting relation:

Fig. 1 is electric power processing system circuit theory diagrams.Because the naked switch of load ratio bridging switch needs single-phase 45V alternating voltage, with needing in timer ± 12V DC voltage is sensor power, so first 220V electric main is accessed through P1 interface, send into respectively after switch S 1 in transformer and AC-DC conversion chip.Transformer directly can export 45V alternating voltage on the threephase switch of the naked switch of P2 interface supply load ratio bridging switch.Pin 1 and the pin 3 of AC-DC power conversion chip access 220V alternating current, + 12V the DC voltage of pin 2 stable output, pin 4 is GND end, then by+12V DC voltage access DC-DC conversion chip pin 1, GND receives on chip pin 2, + 12V the DC voltage of 3,4 pins difference stable outputs of DC-DC conversion chip and stable-12V DC voltage, 5 pins are GND end.

Fig. 2 is current sensor acquisition module circuit diagram.5,6 pins of IN interface in figure, 3,4 pins, 1,2 pins externally connect respectively by the A phase of switch naked with load ratio bridging switch, B phase, C phase switch, internally be connected to input end 1,2 pin of current sensor, realize current sensor to be connected in series in naked on-off circuit, gather the electric current of naked switch.Current sensor 3 pin connects the GND end of direct current power source portion, 4 pins meet the+12V of direct supply, and 5 pins meet-12V, and 6 pins are the output terminal of current sensor, and the output of No. three current sensors is drawn through OUT interface, the capture card after convenient connection.

Circuit working principle:

In a whole set of proving installation, 220V electric main is adopted to input as power supply, required power supply is the 45V alternating voltage that the naked switch of load ratio bridging switch uses respectively, current sensor uses ± 12V DC voltage, so the step-down of 220V alternating voltage is that 45V exchanges in the threephase switch of the naked switch of supply load ratio bridging switch by transformer by AC portion; Direct current component, owing to there being the existence of negative voltage, is first converted to direct current+12V through AC-DC chip, and+12V DC voltage is converted to by the DC-DC conversion chip afterwards through low-power consumption ± and 12V DC voltage is for sensor Acquisition Circuit.Here AC-DC chip selection is the conversion chip of MORNSUN company LH15-10B12 series, and its input ac voltage scope is 85 ~ 264V, and export+12V DC voltage, use power is 15w, isolation voltage 3000VAC; The WRA1212ZP series of the MORNSUN company that DC-DC conversion chip adopts, its input voltage is+9V to+18V, can export ± 12V galvanic current pressure, operate power is 3w, isolation voltage is 1500VDC, and antijamming capability is good, can reach request for utilization.

In sensor Acquisition Circuit, be electric current in naked switch due to what gather, so need the input end of current sensor to be connected in series in the circuit of every phase in naked switch.When naked switch testing, electric current is relatively large, and current sensor requires to bear large alternating current.In order to the accuracy gathered, have employed the AC current sensor of technical grade in circuit, wherein the AC current values of current sensor input 0 ~ 5A scope, exports 0 ~ 5V alternating voltage simulating signal.After the electric current of every phase is all gathered, owing to being analog voltage signal, data handling system can not be directly inputted to, so need to carry out analog to digital conversion to signal, here the data collecting card of customization is directly adopted, sensor signal is carried out A/D conversion, is then sent in data handling system through USB interface.

Overall flow

When carrying out the test of load ratio bridging switch naked switch AC, first power interface in device 45V alternating voltage interface and naked switch is coupled together, sensor assembly is linked in the on-off circuit of naked switch, the interface of information acquisition module is coupled together by USB connecting line and host computer simultaneously, open computer and enter master routine interface, after selecting naked switch testing, the initial information parameter that configuration testing needs, configured laggard enter data processor interface, at this moment by closed electrical source switch, power supply processing module works, a whole set of test macro starts to start, the electric current of three-phase in the naked switch of program Real-time Collection load ratio bridging switch, data are stored and screen shows, wait for the trigger pip of the naked switch of load ratio bridging switch simultaneously.When trigger pip arrives, judge whether trigger condition meets, if met, so record is carried out to data etc., and carries out playback, after wait for tester's instruction, if select to terminate, so just exit naked switch testing, turn back to master routine, if do not terminate the trigger pip so just waited for next time.

Fig. 8 is alternating-current measurement waveform, and this three-phase waveform demonstrates normal load switch of transformer acting characteristic curve.

As can be seen from Figure 9 after naked switching over, there is open circuit in A phase current, illustrates that the contact at A phase switch contacts place disconnects.

Find out that trial curve burr is obvious by monophasic waveform, can show that loose contact lifted one's head by this phase switch.

Sum up, loaded switch naked switch AC proving installation can hand over acting characteristic to carry out alternating-current measurement to the naked switch of load switch of transformer, and proving installation test operation is simple, and test waveform is clear, and test result accurately and reliably simultaneously.Effectively can find and judge the defect of the naked switch of the load ratio bridging switch of transformer, greatly improving test effect and testing efficiency.

Claims (1)

1. an on-load tap changers of transformers naked switch action characteristic alternating-current measurement device, is characterized in that:

A, first by 220V electric main through P1 interface access, send into respectively after switch S 1 in transformer T1 and AC-DC converter;

1. transformer T1 directly exports 45V alternating voltage on the threephase switch of the naked switch of P2 interface supply load ratio bridging switch;

2. AC-DC power supply changeover device accesses 220V alternating current by pin 1 and pin 3, + 12V the DC voltage of pin 2 stable output, pin 4 is GND end, then by+12V DC voltage access dc-dc pin 1, GND receives on dc-dc pin 2,3,4 pins of dc-dc respectively stable outputs ± 12V DC voltage, 5 pins are GND end;

5,6 pins of b, IN input interface, 3,4 pins, the output terminal of 1,2 pins external switch A phase naked with load ratio bridging switch, B phase, C phase is respectively connected in series, and configures resistance R at the output interface of the every phase operating circuit of naked switch; Internally be connected respectively to input end 1,2 pin of current sensor S1, S2, S3, A phase, B phase, the C phase of the naked switch of current sensor S1, S2, S3 corresponding load ratio bridging switch of difference, current sensor 3 pin connects the GND end of direct current power source portion, 4 pins meet the+12V of direct supply, 5 pins meet-12V, 6 pins are the output terminal of current sensor, and the output of No. three current sensors is accessed capture card through OUT.