CN104237785B - 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 measuring instrument, more particularly to dry-type transformer load ratio bridging switch transit time parameter
Tester and its method.
Background technology
Dry-type transformer load ratio bridging switch must assure that electric current will not interrupt when working, in order to avoid cause important electricity consumption to set
It is standby to have a power failure.However, load ratio bridging switch production and assembly are unqualified, switch long-time the reason such as releases and often results in using mechanical part
Switch is abnormal and accidents happened.For Accident prevention generation, before load ratio bridging switch dispatches from the factory and when power-off is keeped in repair, measurement is needed to open
Transit time parameter is closed, but switchs the time interval of execution transitional movement and only have more than 100 milliseconds, be not difficult to discover by instrument
Abnormal conditions.
The general purpose test equipment of detection dry-type transformer load ratio bridging switch has oscillograph, data logger etc., but uses this
A little equipment carry out testing efficiency lowly, and reason is as follows：1. the p-wire that general test equipment is provided is not typically long, and test needs make
Lengthened with patchcord, so as to cause wiring complicated；2. measurement port is limited, dry-type transformer load ratio bridging switch have three groups it is mechanical
Switch, there is 4 mechanical switchs per group, and having 12 switching values needs test, and most general test equipments are not so much
Input channel, thus cannot simultaneously test 12 switching values；3. general test equipment does not have allocation function or software to cut automatically
Whole switch transition waveform is taken, but needs the useless non-transition waveform of artificial removal, and manually surveyed from transition oscillogram
Gauge calculates transit time parameter, in addition it is also necessary to it is artificial by these data inputting storage devices to preserve；4. general test sets
The standby voltage (29V～31V) and electric current (0.9A) that can not be provided needed for dry-type transformer switch testing, needs to provide electricity in addition
Source, in addition plus the various adnexaes such as p-wire, when the complexes of existing detection dry-type transformer load ratio bridging switch are carried very
Inconvenience, unfavorable outdoor detection.
The content of the invention
The present invention provides the dry-type transformer load ratio bridging switch test that a kind of wiring is simple, test is efficient, easy to carry
Instrument and its method, solving prior art need to detect that inconvenient to carry, testing efficiency is low by general purpose test equipments such as oscillographs
Under technical problem.
Tester of the present invention is adopted the following technical scheme that：Dry-type transformer on-load tap changer tester include voltage source,
Voltage sample module and control process center, the voltage source is connected with dry-type transformer load ratio bridging switch；The voltage is adopted
Egf block is connected respectively with dry-type transformer load ratio bridging switch, control process center, and voltage sample module is controlled by control
Reason center；The state change of the dry-type transformer load ratio bridging switch forms voltage sample letter Jing after voltage sample module samples
Number, the voltage sampling signal is transferred to control process center processing, by control process center calculation and show transit time join
Number.
Preferably, the voltage sample module includes input division module and single-chip microcomputer；It is described to be input into division module and do
Formula on-load tap changers of transformers connects, and the single-chip microcomputer is connected with control process center；The voltage sampling signal is by monolithic
Machine carries out sampling formation to the signal Jing after input division module blood pressure lowering.
Preferably, the voltage sample module also includes the insulation blocking being connected between input division module and single-chip microcomputer
Module.
Preferably, the control process center be PC and be arranged on PC for control voltage sampling module, place
Reason voltage sampling signal, the test software that transit time parameter is calculated and be shown.
Preferably, the voltage source includes Switching Power Supply and test voltage module, the output voltage Jing tests of Switching Power Supply
Test voltage needed for providing to dry-type transformer load ratio bridging switch after voltage module blood pressure lowering.The test voltage module was
Pressure protection and counnter attack connection module.
Method of testing of the present invention is adopted the following technical scheme that：Dry-type transformer load ratio bridging switch method of testing, including with
Lower step：
S1, on each mechanical switch of dry-type transformer load ratio bridging switch add DC voltage Uin, and monitor output
Voltage Uout；UoutThrough blood pressure lowering after isolating, U is generateds；
S2, by voltage sample module to UsSignal carries out unitary sampling, and the persistent period of unitary sampling data is t, and t is more than
Dry-type transformer load ratio bridging switch performs the time of once complete transitional movement；
S3, the unitary sampling data of step S2 are sent to into control process center；
S4, voltage sample module determine whether to receive the stopping sample command from control process center, if having,
Stop data sampling, otherwise return to step S2；
S5, control process center receive the last sampled data, and temporarily preserve previous sampled data；
The sampled data that S6, control process centre scan are currently received, in checking dry-type transformer load ratio bridging switch
Whether the open and-shut mode of vacuum bubbles switch MSV there occurs transformation, represent that dry-type transformer loaded tap-off is opened if it there occurs transformation
Pass performs transitional movement, execution step S7；If changing, return to step S5 or stop data receiver with process；
S7, control process center judge transitional movement starts from which position on unitary sampling data time axle, if plus
The upper previous sampled data for temporarily preserving, currently has been received by complete transitional movement data, then by complete transitional movement
Data intercept out from the data for receiving preservation, give up invalid data；Otherwise, then next unitary sampling data receiver is waited
After the completion of, then it is spliced into complete transitional movement data；
S8, control process center change on a timeline according to the state of complete transitional movement data Zhong Ge road signal
Relative position, is calculated and be shown each transit time parameter automatically.
The persistent period of unitary sampling data performs once complete transitional movement more than load ratio bridging switch in step S3
Time, and the persistent period of unitary sampling data the time of once complete transitional movement is performed less than load ratio bridging switch
Twice.
In step S8, control process center also shows transitional movement transformation of data into digital waveform figure, and preserves this time
Transitional movement data.
Compared with prior art, the invention has the beneficial effects as follows：
1st, without the need for switching, p-wire is directly connected to the wiring point on tester and load ratio bridging switch to p-wire.
2nd, easy to carry, tester is built in suitcase, if PC is from no more than 14 cun of notebook computer, notes
This computer can be also positioned in suitcase.
3rd, testing efficiency is higher, three groups of mechanical switchs can be quickly tested simultaneously, without testing a group by a group.
4th, supporting PC test software can provide more automatization, more intuitive test function.Test software control is surveyed
The signal sampling process of examination instrument, receives sampled data, and transit time parameter, automatic centering is calculated and be shown automatically according to data
Show complete transition waveform, store the sampled data of transitional movement automatically.Additionally, test software can also after a test provide report
The generation of announcement and printing function.
5th, when the open and-shut mode to switching carries out voltage sample, the preferred unitary sampling time performs more than load ratio bridging switch
The time once time of complete transitional movement, and unitary sampling performs once complete transitional movement less than load ratio bridging switch
Time twice, the such as unitary sampling time chooses 200ms, so as to avoid sampled data transmission excessively frequently, improves transmission
Efficiency.
Description of the drawings
With reference to the accompanying 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 are respectively the reasons that single group mechanical switch switches from diverse location in dry-type transformer load ratio bridging switch
Think action waveforms；
Fig. 4 is the schematic diagram after present invention encapsulation；
Fig. 5 is the electrical schematic diagram of the present invention；
Fig. 6 is the test philosophy figure of single mechanical switch；
Fig. 7 is the test flow chart of the present invention.
Label is respectively in figure：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.
Specific embodiment
As shown in figure 1, dry-type transformer load ratio bridging switch is segmented into three groups of identical mechanical switchs, i.e., first group machine
Tool switchs 1, second group of mechanical switch 2 and the 3rd group of mechanical switch 3；There are four mechanical switchs, respectively vacuum bubbles per group
(MSV), secondary vacuum bubbles (TTV), switching switch (SelA and SelB).It is a single-pole double-throw switch (SPDT) wherein to switch switch, during test
Need as two single-pole single-throw switch (SPST)s (SelA and SelB).Dry-type transformer load ratio bridging switch perform transitional movement when,
Each switch can perform on-off action in different time points, and the on-off action of switch is then converted into tester the height of level
Low change, the change being further converted between digital quantity 1 and 0, so that the test software on PC is processed.
Fig. 2 and Fig. 3 are that single group mechanical switch is moved from the ideal that diverse location switches in dry-type transformer load ratio bridging switch
Make waveform, the open and close of the height change reflection mechanical switch per road signal, height represents switch closure, and low expression is switched off.
Dash area represents that mechanical switch is opened and closed the shake of moment in figure.
In the present embodiment, dry-type transformer on-load tap changer tester includes Switching Power Supply, overvoltage protection and counnter attack
Connection module, voltage isolation modular converter, input division module, insulation blocking module, single-chip microcomputer, human-machine interface module and radiating mould
Block.Overvoltage protection isolates modular converter with Switching Power Supply, voltage respectively with counnter attack connection module and dry-type transformer loaded tap-off is opened
Connection connects；Voltage isolation modular converter is connected respectively with insulation blocking module, single-chip microcomputer, human-machine interface module and radiating module；
Dry-type transformer load ratio bridging switch, input division module, insulation blocking module and single-chip microcomputer are sequentially connected.Single-chip microcomputer passes through people
Machine interface module is connected with PC.
As shown in figure 4, tester is built in suitcase by the present invention, all p-wires and other apparatus can be placed in case
In trunking 6；When PC is according to notebook computer, also can be positioned on notebook computer placement platform 5.That is, one
Individual suitcase can include all testing tools, carry very convenient.
As shown in figure 5, output adjustable 36V switch DC regulated power supply of the Switching Power Supply using 100W, is whole test
Instrument is powered；Overvoltage protection is mainly made up of with counnter attack connection module electric bridge and overvoltage crowbar, and voltage isolates modular converter by DC-
DC isolates Voltage stabilizing module and switching regulator IC composition, and input division module is made up of divider resistance, and insulation blocking module is by magnetic
Coupling chip and TVS diode are constituted, and single-chip microcomputer adopts 32 ARM chips, human-machine interface module mainly to turn serial ports by high speed USB
Chip is constituted, radiating module mainly by radiator fan and relay group into.
Overvoltage protection is used to prevent switch power source output voltage too high with counnter attack connection module or reverse polarity connection damages instrument, and
Test voltage needed for providing and test electric current.The output voltage of Switching Power Supply is adjustable, and what voltage isolation modular converter can bear
Highest direct current supply voltage is that 36V and supply voltage reverse polarity connection can damage its circuit, and overvoltage protection and counnter attack connection module can be
The connection for isolating modular converter with voltage is automatically cut off when the output voltage of Switching Power Supply is more than 36V, and can be in Switching Power Supply
Output voltage reverse polarity connection when, it is ensured that voltage isolation modular converter supply voltage polarity it is still correct.Additionally, overvoltage protection
Voltage all the way is also directly exported with counnter attack connection module, dry-type transformer loaded tap-off is directly connected to by 4 meters of long p-wires and is opened
Shut as test voltage, this voltage is obtained for switch power source output voltage by diode blood pressure lowering；Adjust the defeated of Switching Power Supply
Go out voltage, you can test voltage is adjusted to into required 29V～31V DC voltages.Because the rated power of Switching Power Supply is
100W, and other module dissipations are total less than 30W, therefore Switching Power Supply can provide the test electric current of 0.9A.
Modular converter is by the output voltage blood pressure lowering of Switching Power Supply and isolates for voltage isolation, needed for provide other modules not
Same running voltage.Because when dry-type on-load tap changer performs transitional movement, the opening and closing of mechanical switch can cause Switching Power Supply defeated
Go out current fluctuation larger, suffer from this other modules (especially single-chip microcomputer and human-machine interface module) and be likely to occur supply voltage not
Stable serious problems.(mainly single-chip microcomputer, human-machine interface module, radiating module and insulation blocking mould additionally, other modules
Block) work in low pressure, it is impossible to directly using tens volts of voltage as supply voltage.Voltage isolation modular converter can export multiple
The different stable low pressure being isolated with its supply voltage, as the running voltage of other modules.
Radiating module is mainly the maximum input division module radiating of caloric value, prevents tester internal temperature too high, leads
Thermally sensitive electronic devices and components hydraulic performance decline is caused, or even is damaged.Test stop after, single-chip microcomputer can cut off radiator fan with
The power supply of test voltage, to reach the purpose for reducing heating and energy-conservation.
The machine being applied to from the test voltage of overvoltage protection and counnter attack connection module on dry-type transformer load ratio bridging switch
After tool switch, the open and-shut mode (switching value) of mechanical switch is converted into level signal and is exported to give input division module.Dry type
On-load tap changers of transformers has three groups of mechanical switchs, there is three groups of on-off models during test, respectively A, B, the C tri- in corresponding diagram
Group signal, every group of on-off model is by 4 signal lines respectively with the input division module phase of 4 meters long of p-wire with tester
Even, it is middle without the need for switching.The voltage of tri- groups of level signals of A, B, C is 29V～31V, it is difficult to directly sampled, therefore by being input into partial pressure
Module is by its blood pressure lowering；The signal obtained after blood pressure lowering corresponds respectively to the tri- groups of signals of A1, B1, C1 in figure.This three groups of A1, B1 and C1
Signal after blood pressure lowering can be for handled by single-chip microcomputer, but to avoid, because of operational error or electrostatic impact, causing control source too high
Single-chip microcomputer and other low-voltage devices are damaged, tri- groups of signals of A1, B1 and C1 produce what is be isolated therewith by insulation blocking module again
Three groups of on-off models, the tri- groups of signals of A2, B2 and C2 in difference corresponding diagram.A2, B2 and C2 this three groups of signal input single-chip microcomputers.
Single-chip microcomputer is the main control chip of tester, can by human-machine interface module receive from PC test software control instruction, and
The unlatching of radiating module is controlled according to control instruction, the break-make of test voltage output is controlled, A2, B2 and C2 signal is adopted
Sample, and sampled data is sent to into PC by human-machine interface module.When calculating transition by the supporting test software on PC
Between parameter, and provide waveform show, the automatic function such as storage and printed report of data.
Human-machine interface module will be transmitted to single-chip microcomputer, together by USB data line from the control instruction of PC test software
When the sampled data of single-chip microcomputer is transmitted to into PC.Human-machine interface module uses the interface of high speed USB 2.0, can meet 12 tunnels and open
The data transportation requirements of Guan Liang, every road 50kHz sampling rates.
Test software is provided with PC, test software is received after the sampled data of tester, therefrom filters out transition and move
Make data, transit time parameter be calculated and be shown automatically further according to transitional movement data, and show transitional movement waveform automatically,
Backstage can also automatically store the sampled data of transitional movement, and after having tested, test software can also provide report generation and print work(
Energy.
The present embodiment can simultaneously test three groups of mechanical switchs of dry-type transformer load ratio bridging switch, each group mechanical switch
Test does not interfere with each other, and method of testing is identical.Referring to Fig. 6,7, the test philosophy of single group mechanical switch is as follows with step：
S1, as shown in fig. 6, straight plus 29V～31V on each mechanical switch of dry-type transformer load ratio bridging switch
Stream voltage Uin, tester is by p-wire monitoring output voltage Uout.When the switch is closed, UoutEqual to Uin, when switching off
When, UoutEqual to 0V.
UoutThrough blood pressure lowering after isolating, generate and UoutThe U being isolateds。UoutEqual to UinWhen, UsIt is electric equal to 3.3V CMOS
High level in flat, works as UoutDuring equal to 0V, UsEqual to the low level in 3.3V CMOS level.So, during switch closure, UsFor
High level, when switching off, UsChange for low level, i.e. on off state is converted into UsChange between two states of low and high level
Change.UsSignal input single-chip microcomputer is for sampling.One group of mechanical switch has 4 mechanical switchs, that is, have 4 independent UsSignal input
Single-chip microcomputer.
S2, single-chip microcomputer are to UsSignal carries out unitary sampling, and according to level height digital quantity 1 and 0 is converted input signals into,
Sampling rate is 50kHz, and wherein digital quantity 1 represents switch closure, and digital quantity 0 is represented and switched off.
S3, single-chip microcomputer are collected after the data of 200ms, by data by human-machine interface module, via USB data line, are passed
Deliver to PC.Why the data of preferred unitary sampling 200ms, i.e. unitary sampling data duration are 200ms, are because doing
Formula on-load tap changers of transformers performs once complete transitional movement needs more than 100 milliseconds of time, the choosing of unitary sampling time
Taking 200ms can avoid data transfer excessively frequent, so as to improve efficiency of transmission.
S4, single-chip microcomputer determine whether to receive stopping sample command, if having, stop data sampling, otherwise return S2.
Test software on S5, PC receives the sampled data of the last time 200ms, and temporarily preserves previous 200ms's
Sampled data, in case subsequent treatment.
The 200ms sampled datas that S6, test software scanning are currently received.As shown in Figures 2 and 3, switch performs transition
During action, the open and-shut mode of vacuum bubbles switch (MSV) is inevitable to be changed in time point earlier, thus test software check corresponding to
Whether the digital quantity of MSV signals there occurs 1 to 0 transformation.If, then it represents that switch performs transitional movement, performs S7；If
It is no, then skip to S9.
S7, test software judge that switch transition action starts from unitary sampling data time axle (scope is 200ms)
Which position, if plus the data of temporary previous sampling 200ms, currently having been received by complete transitional movement data, then will
Complete transitional movement data intercept out from the data for receiving preservation, give up invalid data.Otherwise, then wait next time single
After secondary sampled data is finished receiving, then it is spliced into complete transitional movement data.
The transformation of S8, test software according to complete transitional movement data Zhong Ge road signal between 1 and 0 is on a timeline
Relative position, each transit time parameter is calculated and be shown automatically.Again by transitional movement transformation of data into digital waveform figure simultaneously
It is shown centered on, while backstage automatically saves this transitional movement data.
If S9, user select to stop sampling switch status data, S10 is performed, otherwise return S5.
S10, tester send to tester and stop sample command via USB data line, and stop data receiver with place
Reason.
Above-described embodiment is one embodiment of the present invention, but embodiments of the present invention are not limited and this, are engaged in
Any modification, replacement, improvement that art personnel are made under without departing from spirit of the invention and principle, are all contained in this
In bright protection domain.
Claims (10)
1. dry-type transformer on-load tap changer tester, it is characterised in that at voltage source, voltage sample module and control
Reason center, the voltage source is connected with dry-type transformer load ratio bridging switch；The voltage sample module respectively with dry type transformation
Device load ratio bridging switch, the connection of control process center, voltage sample module is controlled by control process center；The dry-type transformer
The state change of load ratio bridging switch forms voltage sampling signal Jing after voltage sample module samples, and the voltage sampling signal is passed
It is defeated to control process center processing, by control process center calculation and show transit time parameter；
The voltage sampling signal that the control process centre scan is currently received, in checking dry-type transformer load ratio bridging switch
Whether the open and-shut mode of vacuum bubbles switch MSV there occurs transformation：
Represent that dry-type transformer load ratio bridging switch performs transitional movement, judges that transitional movement starts if it there occurs transformation
Which position on single voltage sampling signal time shafts, if plus the temporary transient previous voltage sampling signal for preserving, currently
Complete transitional movement data are had been received by, is then intercepted out complete transitional movement data from the data for receiving preservation
Come, give up invalid data；Otherwise, then after waiting next single voltage sampling signal to finish receiving, then it is spliced into complete transition
Action data；Control process center changes phase on a timeline according to the state of complete transitional movement data Zhong Ge road signal
To position, each transit time parameter is calculated and be shown automatically；
If changing, the voltage sampling signal or stopping data receiver and process being currently received is rescaned.
2. dry-type transformer on-load tap changer tester according to claim 1, it is characterised in that the voltage sample
Module includes input division module and single-chip microcomputer；The input division module is connected with dry-type transformer load ratio bridging switch, institute
State single-chip microcomputer to be connected with control process center；The voltage sampling signal is by single-chip microcomputer to the letter Jing after input division module blood pressure lowering
Number carry out sampling formation.
3. dry-type transformer on-load tap changer tester according to claim 2, it is characterised in that the voltage sample
Module also includes the insulation blocking module being connected between input division module and single-chip microcomputer.
4. dry-type transformer on-load tap changer tester according to claim 1, it is characterised in that the control process
Center be PC and be arranged on PC for control voltage sampling module, process voltage sampling signal, be calculated and be shown
Cross the test software of time parameter.
5. dry-type transformer on-load tap changer tester according to claim 1, it is characterised in that the voltage source bag
Switching Power Supply and test voltage module are included, the output voltage of Switching Power Supply has Jing after test voltage module blood pressure lowering to dry-type transformer
On-load shunting switch provides required test voltage.
6. dry-type transformer on-load tap changer tester according to claim 5, it is characterised in that the test voltage
Module is overvoltage protection and counnter attack connection module.
7. dry-type transformer on-load tap changer tester according to claim 5, it is characterised in that the voltage source is also
Isolate modular converter including the voltage for connecting with test voltage module, voltage sample module respectively.
8. the dry-type transformer load ratio bridging switch based on dry-type transformer on-load tap changer tester described in claim 1 is surveyed
Method for testing, it is characterised in that comprise the following steps：
S1, on each mechanical switch of dry-type transformer load ratio bridging switch add DC voltage Uin, and monitor output voltage
Uout；UoutThrough blood pressure lowering after isolating, U is generateds；
S2, by voltage sample module to UsSignal carries out unitary sampling, and the persistent period of unitary sampling data is t, and t is more than dry type
On-load tap changers of transformers performs the time of once complete transitional movement；
S3, the unitary sampling data of step S2 are sent to into control process center；
S4, voltage sample module determine whether to receive the stopping sample command from control process center, if having, stop
Data sampling, otherwise return to step S2；
S5, control process center receive the last sampled data, and temporarily preserve previous sampled data；
The sampled data that S6, control process centre scan are currently received, checks vacuum in dry-type transformer load ratio bridging switch
Whether the open and-shut mode for bubbling open pass MSV there occurs transformation, represent that dry-type transformer load ratio bridging switch is held if it there occurs transformation
Transitional movement is gone, execution step S7；If changing, return to step S5 or stop data receiver with process；
S7, control process center judge transitional movement starts from which position on unitary sampling data time axle, if plus temporary
The previous sampled data of Shi Baocun, currently has been received by complete transitional movement data, then by complete transitional movement data
Intercept out from the data for receiving preservation, give up invalid data；Otherwise, then next unitary sampling data receiver is waited to complete
Afterwards, then it is spliced into complete transitional movement data；
S8, control process center change on a timeline relative according to the state of complete transitional movement data Zhong Ge road signal
Position, is calculated and be shown each transit time parameter automatically.
9. dry-type transformer load ratio bridging switch method of testing according to claim 8, it is characterised in that single in step S3
The persistent period of secondary sampled data performs the time of once complete transitional movement, and unitary sampling number more than load ratio bridging switch
According to persistent period perform less than load ratio bridging switch once complete transitional movement time twice.
10. dry-type transformer load ratio bridging switch method of testing according to claim 8, it is characterised in that in step S8
Control process center also shows transitional movement transformation of data into digital waveform figure, and preserves this transitional movement data.
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| CN109633425B (en) * | 2018-11-27 | 2020-12-01 | 国网江苏省电力有限公司检修分公司 | Action characteristic simulation device for vacuum on-load tap-changer of dry-type transformer |
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| 变压器有载分接开关检测系统的设计;刘云鹏等;《高压电器》;20070228;第43卷(第1期);正文第25-28页 * |
| 基于AD7656变压器有载开关测试仪设计;裴宏涛等;《甘肃科学学报》;20080930;第20卷(第3期);正文第99-102页 * |
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| CN104237785A (en) | 2014-12-24 |
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