CN104237785A - Dry-type transformer on-load tap-changer tester and method thereof - Google Patents
Dry-type transformer on-load tap-changer tester and method thereof Download PDFInfo
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Abstract
The invention relates to a dry-type transformer on-load tap-changer tester and a method thereof. The dry-type transformer on-load tap-changer tester comprises a voltage source, a voltage sampling module and a controlling and processing center, and the voltage sources are connected with a dry-type transformer on-load tap-changer switch; the voltage sampling module is connected with the dry-type transformer on-load tap-changer switch and the controlling and processing center, and the voltage sampling module is controlled through the controlling and processing center; change of states of the dry-type transformer on-load tap-changer switch forms voltage sampling signals after being sampled through the voltage sampling module, the voltage sampling signals are transmitted to the controlling and processing center, and transition time parameters are calculated and displayed through the controlling and processing center. By the dry-type transformer on-load tap-changer tester and the method thereof, technical problems that general purpose test equipment of oscilloscopes and the like are needed in test in the prior art, inconvenience in carrying is caused, and testing efficiency is low are solved.
Description
Technical field
The present invention relates to high-voltage electrical apparatus surveying instrument, particularly relate to tester and the method thereof of dry-type transformer load ratio bridging switch parameter transit time.
Background technology
Must guarantee that electric current can not interrupt during the work of dry-type transformer load ratio bridging switch, in order to avoid cause important consumer to have a power failure.But load ratio bridging switch production and assembly are defective, switch uses that the reasons such as mechanical part gets loose often cause switch abnormal for a long time and accidents happened.For Accident prevention occurs, before load ratio bridging switch dispatches from the factory and when power-off is keeped in repair, need to measure switch transition time parameter, but the time interval that switch performs transitional movement only has more than 100 millisecond, is not difficult to discover abnormal conditions by instrument.
The general purpose test equipment detecting dry-type transformer load ratio bridging switch has oscillograph, datalogger etc., but it is low to carry out testing efficiency with these equipment, reason is as follows: 1. the p-wire that general testing apparatus provides is generally not long, and test needs to use patchcord to lengthen, thus causes wiring complicated; 2. measurement port is limited, dry-type transformer load ratio bridging switch has three groups of mechanical switchs, and often group has 4 mechanical switchs, and having 12 switching values needs test, and most general testing apparatus does not have so much input channel, thus cannot test 12 switching values simultaneously; 3. general testing apparatus does not have allocation function or software automatically to intercept complete switch transition waveform, but the non-transition waveform needing artificial removal useless, and manual measurement calculates parameter transit time from transition oscillogram, also need artificial by these data inputting memory devices to preserve; 4. general testing apparatus can not provide voltage (29V ~ 31V) needed for dry-type transformer switch testing and electric current (0.9A), need to provide power supply in addition, add the various annexes such as p-wire in addition, very inconvenient when the complete equipment of existing detection dry-type transformer load ratio bridging switch carry, unfavorable outdoor detection.
Summary of the invention
The invention provides a kind of wiring simple, test dry-type transformer on-load tap changer tester efficient, easy to carry and method thereof, solve prior art to detect by general purpose test equipments such as oscillographs, carry inconvenience, the technical matters that testing efficiency is low.
Tester of the present invention adopts following technical scheme: dry-type transformer on-load tap changer tester comprises voltage source, voltage sample module and control treatment center, and described voltage source is connected with dry-type transformer load ratio bridging switch; Described voltage sample module is connected with dry-type transformer load ratio bridging switch, control treatment center respectively, and voltage sample module is controlled by control treatment center; State change coating-forming voltage sampled signal after voltage sample module samples of described dry-type transformer load ratio bridging switch, described voltage sampling signal is transferred to control treatment center processing, shows parameter transit time by control treatment center calculation.
Preferably, described voltage sample module comprises input division module and single-chip microcomputer; Described input division module is connected with dry-type transformer load ratio bridging switch, and described single-chip microcomputer is connected with control treatment center; Described voltage sampling signal carries out sampling by single-chip microcomputer to the signal after the step-down of input division module and is formed.
Preferably, described voltage sample module also comprises the insulation blocking module be connected between input division module and single-chip microcomputer.
Preferably, described control treatment center be PC and be arranged on PC for control voltage sampling module, process voltage sampling signal, calculating show the testing software of parameter transit time.
Preferably, described voltage source comprises Switching Power Supply and test voltage module, and the output voltage of Switching Power Supply provides required test voltage to dry-type transformer load ratio bridging switch after voltage module step-down after tested.Described test voltage module is overvoltage protection and anti-reverse module.
Method of testing of the present invention adopts following technical scheme: dry-type transformer load ratio bridging switch method of testing, comprises the following steps:
S1, on each mechanical switch of dry-type transformer load ratio bridging switch, add DC voltage U
in, and monitor output voltage U
out; U
outafter step-down with isolation, generate U
s;
S2, by voltage sample module to U
ssignal carries out unitary sampling, and the duration of unitary sampling data is the time that t, t are greater than that dry-type transformer load ratio bridging switch performs once complete transitional movement;
S3, the unitary sampling data of step S2 are sent to control treatment center;
S4, voltage sample module judge whether to receive the stopping sample command from control treatment center, if having, then stop data sampling, otherwise return step S2;
S5, the sampled data of control treatment receive centre the last time, and temporarily preserve previous sampled data;
The sampled data that S6, control treatment centre scan are currently received, check whether the open and-shut mode of vacuum bubbles switch MSV in dry-type transformer load ratio bridging switch there occurs transformation, if there occurs transformation, represent that dry-type transformer load ratio bridging switch performs transitional movement, perform step S7; If change, then return step S5 or stop data receiver and process;
S7, control treatment center judge transitional movement starts from which position on unitary sampling data time axle, if add the previous sampled data of temporarily preserving, currently complete transitional movement data are received, then complete transitional movement data are intercepted out from the data receiving preservation, give up invalid data; Otherwise, then after waiting for that next unitary sampling data receiver completes, then splice complete transitional movement data;
S8, control treatment center, according to the state transfer relative position on a timeline of complete transitional movement data Zhong Ge road signal, automatically calculate and show each of parameter transit time.
In step S3, the duration of unitary sampling data is greater than the time that load ratio bridging switch performs once complete transitional movement, and the duration of unitary sampling data is less than the twice that load ratio bridging switch performs the time of once complete transitional movement.
In step S8, transitional movement data are also transformed into digital waveform figure and show by control treatment center, and preserve this transitional movement data.
Compared with prior art, the invention has the beneficial effects as follows:
1, p-wire is without the need to switching, the wiring point on the direct connecting test instrument of p-wire and load ratio bridging switch.
2, easy to carry, tester is built in suitcase, if the notebook computer being not more than 14 cun selected by PC, notebook computer also can be positioned in suitcase.
3, testing efficiency is higher, can test three groups of mechanical switchs fast simultaneously, and not need to test a group by a group.
4, supporting PC testing software can provide more robotization, more intuitive test function.Testing software controls the signal sampling process of tester, receives sampled data, and automatically calculate according to data and show parameter transit time, automatic centering shows complete transition waveform, the sampled data of autostore transitional movement.In addition, testing software can also provide generation and the printing function of report after a test.
When 5, voltage sample being carried out to the open and-shut mode of switch, the preferred unitary sampling time is greater than the time that load ratio bridging switch performs once complete transitional movement, and the unitary sampling time is less than the twice that load ratio bridging switch performs the time of once complete transitional movement, as the unitary sampling time chooses 200ms, thus it is too frequent to avoid sampled data to transmit, and improves transfer efficiency.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described:
Fig. 1 is the distribution schematic diagram of three groups of mechanical switchs in dry-type transformer load ratio bridging switch;
Fig. 2 and Fig. 3 is the desired action waveform that in dry-type transformer load ratio bridging switch, single group mechanical switch switches from diverse location respectively;
Fig. 4 is the schematic diagram after the present invention encapsulates;
Fig. 5 is electrical schematic diagram of the present invention;
Fig. 6 is the test philosophy figure of single mechanical switch;
Fig. 7 is test flow chart of the present invention.
Number in the figure is respectively: 1. first group of mechanical switch, 2. second group of mechanical switch, 3. the 3rd group of mechanical switch, 4. patch panel, 5. notebook computer placement platform, 6. trunking.
Embodiment
As shown in Figure 1, dry-type transformer load ratio bridging switch can be divided into three groups of identical mechanical switchs, i.e. first group of mechanical switch, 1, second group of mechanical switch 2 and the 3rd group of mechanical switch 3; Often group has four mechanical switchs, is respectively vacuum bubbles (MSV), secondary vacuum bubbles (TTV), change-over switch (SelA and SelB).Wherein change-over switch is a single-pole double-throw switch (SPDT), needs as two single-pole single-throw switch (SPST)s (SelA and SelB) during test.Dry-type transformer load ratio bridging switch is when performing transitional movement, each switch can perform on-off action at different time points, the on-off action of switch is then converted to the height change of level by tester, convert the change between digital quantity 1 and 0 more further to, for the testing software process on PC.
Fig. 2 and Fig. 3 is the desired action waveform that in dry-type transformer load ratio bridging switch, single group mechanical switch switches from diverse location, and the open and close of the height change reflection mechanical switch of every road signal, height represents that switch closes, and low expression switch disconnects.In figure, dash area represents the shake of mechanical switch opening and closing moment.
In the present embodiment, dry-type transformer on-load tap changer tester comprises Switching Power Supply, overvoltage protection and anti-reverse module, voltage isolates modular converter, input division module, insulation blocking module, single-chip microcomputer, human-machine interface module and radiating module.Overvoltage protection and anti-reverse module isolate modular converter with Switching Power Supply, voltage respectively and dry-type transformer load ratio bridging switch is connected; Voltage isolation modular converter is connected with insulation blocking module, single-chip microcomputer, human-machine interface module and radiating module respectively; Dry-type transformer load ratio bridging switch, input division module, insulation blocking module and single-chip microcomputer connect successively.Single-chip microcomputer is connected with PC by human-machine interface module.
As shown in Figure 4, tester is built in suitcase by the present invention, and all p-wires and other apparatus can be placed in the trunking 6 in case; When PC is according to notebook computer, also can be positioned on notebook computer placement platform 5.That is, a suitcase can comprise all testing tools, carries easily.
As shown in Figure 5, the 36V switch DC stabilized voltage supply that Switching Power Supply adopts the output of 100W adjustable, for whole tester is powered; Overvoltage protection and anti-reverse module form primarily of electric bridge and overvoltage crowbar; voltage isolation modular converter isolates Voltage stabilizing module by DC-DC and switching regulator IC forms; input division module is made up of divider resistance; insulation blocking module is made up of magnetic coupling chip and TVS diode; single-chip microcomputer adopts 32 ARM chips; human-machine interface module turns serial port chip primarily of high speed USB and forms, and radiating module is primarily of radiator fan and relay composition.
Overvoltage protection and anti-reverse module are used for preventing the too high or reverse polarity connection of switch power source output voltage from damaging instrument, and provide required test voltage and measuring current.The output voltage of Switching Power Supply is adjustable; and the voltage isolation modular converter the highest direct current supply voltage that can bear is 36V and supply voltage reverse polarity connection can damage its circuit; overvoltage protection and anti-reverse module can at the output voltage of Switching Power Supply more than automatically cutting off the connection isolating modular converter with voltage during 36V; and when the output voltage reverse polarity connection of Switching Power Supply, can ensure that the supply voltage polarity of voltage isolation modular converter is still correct.In addition, overvoltage protection and anti-reverse module also directly export a road voltage, directly receive as test voltage on dry-type transformer load ratio bridging switch by the p-wires of 4 meters long, and this voltage is that switch power source output voltage is obtained by diode step-down; The output voltage of by-pass cock power supply, can be adjusted to required 29V ~ 31V DC voltage by test voltage.Rated power because of Switching Power Supply is 100W, and other module dissipations total is no more than 30W, therefore Switching Power Supply can provide the measuring current of 0.9A.
The output voltage step-down of Switching Power Supply to be isolated, to provide the voltage of the different operating needed for other modules by voltage isolation modular converter.Because when dry-type on-load tap changer performs transitional movement, it is comparatively large that the opening and closing of mechanical switch can cause switch power supply output current to fluctuate, and affects by this serious problems that supply voltage instability may appear in other modules (especially single-chip microcomputer and human-machine interface module).In addition, other modules (mainly single-chip microcomputer, human-machine interface module, radiating module and insulation blocking module) work in low pressure, cannot directly using the voltage of tens volts as supply voltage.Voltage isolation modular converter can export multiple different stable low pressure isolated with its supply voltage, as the operating voltage of other modules.
Radiating module is mainly the maximum input division module heat radiation of thermal value, prevents tester internal temperature too high, causes thermally sensitive electronic devices and components hydraulic performance decline, even damage.After test stops, single-chip microcomputer can cut off the power supply of radiator fan and test voltage, reduces heating and energy-conservation object to reach.
After being applied to the mechanical switch on dry-type transformer load ratio bridging switch from the test voltage of overvoltage protection and anti-reverse module, the open and-shut mode (switching value) of mechanical switch is converted to level signal and exports to input division module.Dry-type transformer load ratio bridging switch has three groups of mechanical switchs, three groups of on-off model are had during test, A, B, C tri-groups of signals respectively in corresponding diagram, are often organized on-off model and are connected with the input division module of tester with the p-wire of 4 meters long respectively by 4 signal line, middle without the need to switching.The voltage of A, B, C tri-groups of level signals is 29V ~ 31V, is difficult to Direct Sampling, therefore by input division module by its step-down; The signal obtained after step-down corresponds respectively to A1, B1, C1 tri-groups of signals in figure.Signal after these three groups of step-downs of A1, B1 and C1 can handled by single-chip microcomputer; but for avoiding because of misoperation or electrostatic impact; voltage is caused to input too high damage single-chip microcomputer and other low-voltage devices; A1, B1 and C1 tri-groups of signals produce three groups of isolated with it on-off model by insulation blocking module again, A2, B2 and C2 tri-groups of signals respectively in corresponding diagram.These three groups of signal input single-chip microcomputers of A2, B2 and C2.Single-chip microcomputer is the main control chip of tester, the steering order from PC testing software is received by human-machine interface module, and the unlatching of radiating module is controlled according to steering order, control the break-make that test voltage exports, A2, B2 and C2 signal is sampled, and sampled data is sent to PC by human-machine interface module.Calculate parameter transit time by the supporting testing software on PC, and the functions such as waveform display, data autostore and printed report are provided.
Steering order from PC testing software, by USB data line, is transmitted to single-chip microcomputer, the sampled data of single-chip microcomputer is transmitted to PC simultaneously by human-machine interface module.Human-machine interface module uses high speed USB 2.0 interface, can meet the data transportation requirements of 12 way switch amounts, every road 50kHz sampling rate.
Testing software is provided with in PC, testing software receives from after the sampled data of tester, therefrom filter out transitional movement data, automatically calculate according to transitional movement data again and show parameter transit time, and automatically show transitional movement waveform, backstage also can the sampled data of autostore transitional movement, and after testing, testing software can also provide report generation and printing function.
The present embodiment can test three groups of mechanical switchs of dry-type transformer load ratio bridging switch simultaneously, and the test of each group mechanical switch does not interfere with each other, and method of testing is identical.See Fig. 6,7, test philosophy and the step of single group mechanical switch are as follows:
S1, as shown in Figure 6, each mechanical switch of dry-type transformer load ratio bridging switch adds the DC voltage U of 29V ~ 31V
in, tester is by p-wire monitoring output voltage U
out.When the switch is closed, U
outequal U
in, when the switches are opened, U
outequal 0V.
U
outafter step-down with isolation, generate and U
outisolated U
s.U
outequal U
intime, U
sequal the high level in 3.3V CMOS level, work as U
outwhen equaling 0V, U
sequal the low level in 3.3V CMOS level.Like this, when switch closes, U
sfor high level, when switch disconnects, U
sfor low level, namely the change of on off state converts U to
schange between low and high level two states.U
ssignal input single-chip microcomputer is for sampling.One group of mechanical switch has 4 mechanical switchs, namely has 4 independently U
ssignal input single-chip microcomputer.
S2, single-chip microcomputer are to U
ssignal carries out unitary sampling, and convert input signal to digital quantity 1 and 0 according to level height, sampling rate is 50kHz, and wherein digital quantity 1 represents that switch closes, and digital quantity 0 represents that switch disconnects.
After S3, single-chip microcomputer collect the data of 200ms, by data by human-machine interface module, via USB data line, be sent to PC.The why preferably data of unitary sampling 200ms, namely unitary sampling data duration is 200ms, because dry-type transformer load ratio bridging switch performs the time that once complete transitional movement needs more than 100 millisecond, the unitary sampling time is chosen 200ms and data can be avoided to transmit too frequently, thus improves transfer efficiency.
S4, single-chip microcomputer have judged whether to receive stopping sample command, if having, then stop data sampling, otherwise return S2.
Testing software on S5, PC receives the sampled data of the last 200ms, and temporarily preserves the sampled data of previous 200ms, in order to subsequent treatment.
S6, testing software scan the 200ms sampled data be currently received.As shown in Figures 2 and 3, when switch performs transitional movement, the open and-shut mode of vacuum bubbles switch (MSV) is inevitable to be changed at time point comparatively early, therefore whether the digital quantity that testing software checks corresponding to MSV signal there occurs the transformation of 1 to 0.If so, then represent that switch performs transitional movement, performs S7; If not, then S9 is skipped to.
S7, testing software judge switch transition action starts from which position on unitary sampling data time axle (scope is 200ms), if add the data of temporary previous sampling 200ms, currently complete transitional movement data are received, then complete transitional movement data are intercepted out from the data receiving preservation, give up invalid data.Otherwise, then after waiting for that next unitary sampling data receiver completes, then splice complete transitional movement data.
S8, testing software, according to the complete transformation relative position on a timeline of transitional movement data Zhong Ge road signal between 1 and 0, automatically calculate and show each of parameter transit time.Transitional movement data are transformed into digital waveform figure and display placed in the middle, this transitional movement data are preserved on backstage automatically simultaneously again.
If S9 user selects to stop sampling switch status data, then perform S10, otherwise return S5.
S10, tester, via USB data line, send to tester and stop sample command, and stop data receiver and process.
Above-described embodiment is one embodiment of the present invention; but embodiments of the present invention do not limit therewith; be engaged in these those skilled in the art do not deviate from the present invention spirit and principle under make any amendment, replacement, improvement, be all included in protection scope of the present invention.
Claims (10)
1. dry-type transformer on-load tap changer tester, is characterized in that, comprise voltage source, voltage sample module and control treatment center, described voltage source is connected with dry-type transformer load ratio bridging switch; Described voltage sample module is connected with dry-type transformer load ratio bridging switch, control treatment center respectively, and voltage sample module is controlled by control treatment center; State change coating-forming voltage sampled signal after voltage sample module samples of described dry-type transformer load ratio bridging switch, described voltage sampling signal is transferred to control treatment center processing, shows parameter transit time by control treatment center calculation.
2. dry-type transformer on-load tap changer tester according to claim 1, is characterized in that, described voltage sample module comprises input division module and single-chip microcomputer; Described input division module is connected with dry-type transformer load ratio bridging switch, and described single-chip microcomputer is connected with control treatment center; Described voltage sampling signal carries out sampling by single-chip microcomputer to the signal after the step-down of input division module and is formed.
3. dry-type transformer on-load tap changer tester according to claim 2, is characterized in that, described voltage sample module also comprises the insulation blocking module be connected between input division module and single-chip microcomputer.
4. dry-type transformer on-load tap changer tester according to claim 1, it is characterized in that, described control treatment center be PC and be arranged on PC for control voltage sampling module, process voltage sampling signal, calculating show the testing software of parameter transit time.
5. dry-type transformer on-load tap changer tester according to claim 1, it is characterized in that, described voltage source comprises Switching Power Supply and test voltage module, and the output voltage of Switching Power Supply provides required test voltage to dry-type transformer load ratio bridging switch after voltage module step-down after tested.
6. dry-type transformer on-load tap changer tester according to claim 5, is characterized in that, described test voltage module is overvoltage protection and anti-reverse module.
7. dry-type transformer on-load tap changer tester according to claim 5, is characterized in that, described voltage source also comprises isolates modular converter with the voltage of test voltage module, voltage sample model calling respectively.
8., based on the dry-type transformer load ratio bridging switch method of testing of dry-type transformer on-load tap changer tester described in claim 1, it is characterized in that, comprise the following steps:
S1, on each mechanical switch of dry-type transformer load ratio bridging switch, add DC voltage U
in, and monitor output voltage U
out; U
outafter step-down with isolation, generate U
s;
S2, by voltage sample module to U
ssignal carries out unitary sampling, and the duration of unitary sampling data is the time that t, t are greater than that dry-type transformer load ratio bridging switch performs once complete transitional movement;
S3, the unitary sampling data of step S2 are sent to control treatment center;
S4, voltage sample module judge whether to receive the stopping sample command from control treatment center, if having, then stop data sampling, otherwise return step S2;
S5, the sampled data of control treatment receive centre the last time, and temporarily preserve previous sampled data;
The sampled data that S6, control treatment centre scan are currently received, check whether the open and-shut mode of vacuum bubbles switch MSV in dry-type transformer load ratio bridging switch there occurs transformation, if there occurs transformation, represent that dry-type transformer load ratio bridging switch performs transitional movement, perform step S7; If change, then return step S5 or stop data receiver and process;
S7, control treatment center judge transitional movement starts from which position on unitary sampling data time axle, if add the previous sampled data of temporarily preserving, currently complete transitional movement data are received, then complete transitional movement data are intercepted out from the data receiving preservation, give up invalid data; Otherwise, then after waiting for that next unitary sampling data receiver completes, then splice complete transitional movement data;
S8, control treatment center, according to the state transfer relative position on a timeline of complete transitional movement data Zhong Ge road signal, automatically calculate and show each of parameter transit time.
9. dry-type transformer load ratio bridging switch method of testing according to claim 8, it is characterized in that, in step S3, the duration of unitary sampling data is greater than the time that load ratio bridging switch performs once complete transitional movement, and the duration of unitary sampling data is less than the twice that load ratio bridging switch performs the time of once complete transitional movement.
10. dry-type transformer load ratio bridging switch method of testing according to claim 8, is characterized in that, in step S8, transitional movement data are also transformed into digital waveform figure and show by control treatment center, and preserve this transitional movement data.
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|---|---|---|---|
| CN201410541757.1A CN104237785B (en) | 2014-10-14 | 2014-10-14 | Dry-type transformer on-load tap-changer tester and method thereof |
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| CN104237785B CN104237785B (en) | 2017-05-03 |
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| Publication number | Publication date |
|---|---|
| CN104237785B (en) | 2017-05-03 |
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