CN108535587A - A kind of transformer connection fault testing apparatus - Google Patents
A kind of transformer connection fault testing apparatus Download PDFInfo
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- CN108535587A CN108535587A CN201810355724.6A CN201810355724A CN108535587A CN 108535587 A CN108535587 A CN 108535587A CN 201810355724 A CN201810355724 A CN 201810355724A CN 108535587 A CN108535587 A CN 108535587A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The present invention proposes a kind of transformer connection fault testing apparatus, including three phase variable frequency experiment power supply, three-phase collector, low-pressure side wiring load combinations switch, fictitious load resistance box, control device, test and control software, subject transformer is connect with three phase variable frequency experiment power supply, low-pressure side wiring load combinations switch and fictitious load, passes through three-phase collector acquisition subject high voltage side of transformer, the voltage and current of low-pressure side or load-side.The present invention uses low voltage experiment, considerably enhances Security of test.Particularly, the present invention is provided with experiment cable insulating sheath device, can exclude interference of the live crosstalk voltage to test, avoids crosstalk high voltage to testing the damage of system, and ensure the personal safety of site operation personnel.
Description
Technical field
The present invention relates to field of electrical equipment more particularly to a kind of transformer connection fault testing apparatus.
Background technology
When carrying out power transformer commissioning test, an essential step is wiring check.Wiring check refers generally to
To malfunction caused by the incorrect link of transformer low voltage output end signal phase or amplitude caused by artificial wiring error
It checks.When wiring check is generally tested at the scene, by being flowed up to transformer, then pass through voltage connected to it in low-pressure end
Mutual inductor and current transformer carry out the observation of signal waveform or phase.When mistake occurs for transformer itself terminal connections, i.e.,
So that the wiring of voltage transformer and current transformer is not malfunctioned, can still lead to the action of protective device, causes chain have a power failure instead
It answers.Therefore, in the prior art, using directly to transformer according to nominal working conditions boosting up-flow method be to have security risk
's.
Often think that load box and load combinations switch are to belong to absolute low-voltage safety equipment when routine test, in test
Consideration facilitates adjusting parameter and is closer to tester.In fact, since live substation low-voltage side leading-out terminal has number
Meter Gao, and economic loss is reduced to ensure national economy operating when testing, it is impossible to other adjacent lines are all had a power failure, thus
High voltage may can be sensed near step down side, on the one hand lead to live interference, on the other hand by the crosstalk
In voltage output to load babinet, personal safety hidden danger is brought to operating personnel.
Line voltage distribution is caused to be crosstalked into experiment low pressure side loop just like several situations：
1）Signal wiring when experiment and equivalent capacity is formd between ground, moreover, because transformer test wiring is more, existed
Parallel multiply structure, the equivalent capacity between test wire is as the length of test wire increases and increases.Therefore, for testing cable
Up to more than ten meters or more of environment, test circuit is easy to form capacitive coupling relation length with neighbouring high-tension line, and exchange is high
Voltage is coupled to by equivalent capacity effect on test connection.
2）There are corona discharge or other failure classes electric discharge phenomena, discharge voltages may reach thousands of lie prostrate to tens of for neighbouring circuit
Kilovolt, resonance phenomena can occur for the insulation distributed constant of circuit itself when due to electric discharge, and the signal frequency of electric discharge may deposit
In power frequency, intermediate frequency and high-frequency signal.Its high frequency signal has transmission and coupling distance farther out, in this case, transformer
New energy release channel may be established between test circuit and neighbouring point of discharge, and more than the ducting capacity of power frequency component
By force.
3）Crosstalk high voltage signal is transferred to low-pressure side from high-pressure side through transformer pressure-reducing, which is still significantly larger than
Voltage in low pressure test (LPT) pattern.
4）Crosstalk high voltage signal is directly discharged by low-pressure side cable, to be more introduced directly into load babinet it
On.
From the analysis above, we can see that for the transformer testing scheme of low pressure test (LPT) pattern, although its signal reduces, pass through change
Anti-interference ability is obtained after frequency, but it is difficult to exclude that the crosstalk voltage at scene, which is, the voltage strength of crosstalk may be remote high
In the dielectric strength and safe class of test system self-operating.Thus it needs to innovate above scheme, to solve safety
Problem.
Certainly, you need to add is that, when field test completely use specified high-voltage test when, although there is also crosstalk electricity
Pressure, but the class of insulation of entire pilot system is according to the condition equal to or higher than transformer rated voltage, for tester
Safe distance required there is also corresponding, thus occur mainly in low pressure test (LPT) solution party adjacent to the problem of alive circuit crosstalk
In case.
Invention content
To solve the above-mentioned problems, the present invention proposes a kind of transformer connection fault testing apparatus, will subject transformer with
Three phase variable frequency experiment power supply, low-pressure side wiring load combinations switch are connected with fictitious load, are acquired and are tested by three-phase collector
The voltage and current of high voltage side of transformer, low-pressure side or load-side overcomes the prior art and is carrying out power transformer debugging fortune
Directly to transformer according to security risk caused by nominal working conditions boosting up-flow when row, particularly, the present invention is provided with
Cable insulating sheath device is tested, interference of the live crosstalk voltage to test can be excluded, avoids crosstalk high voltage to test system
The damage of system, and ensure the personal safety of site operation personnel.
Specifically, a kind of transformer connection fault testing apparatus, which is characterized in that including three phase variable frequency experiment power supply, examination
It is soft to test cable, three-phase collector, low-pressure side wiring load combinations switch, fictitious load resistance box, control device, test and control
Part, the three phase variable frequency experiment power supply output end are connect by the experiment cable with the high-pressure side for being tested transformer, the quilt
The low-pressure side for trying transformer is switched and the fictitious load by the experiment cable by the low-pressure side wiring load combinations
Resistance box connects, and the high-pressure side of the subject transformer is connected to the three-phase after decompression couples by the experiment cable and adopts
Storage, the three-phase collector also connect the low-pressure side of the subject transformer or the fictitious load by the experiment cable
Resistance box, the control device are separately connected the three-phase collector and the three phase variable frequency experiment power supply；
The three phase variable frequency experiment power supply is controlled by the control device, realizes the adjusting of output frequency and output voltage；
The low-pressure side wiring load combinations switch is for realizing the examination step down side three-phase outlet line and the mould
The wiring switching of quasi- load resistance box；
The fictitious load resistance box includes at least three groups of resistance, negative for realizing the star-like load connection of three-phase or three-phase triangle
Carry connection；
The three-phase collector for acquire the subject high voltage side of transformer and the three-phase current of low-pressure side or load-side with
Voltage；
The control device is industrial personal computer or microcontroller, and the test is deployed in control software on the industrial personal computer, or deployment
In on the host computer communicated to connect with the control device, the test is tested with control software for the three phase variable frequency to be arranged
The sample rate of the output frequency of power supply and the three-phase collector controls the letter of the control device and the three-phase collector
Breath interaction, and collected three-phase voltage and electric current are processed and displayed.
As an improvement transformer connection fault testing apparatus further includes experiment cable insulating sheath device, the examination
Cable insulating sheath device is tested to be set in outside the experiment cable connecting with the subject high voltage side of transformer and low-pressure side, it is described
Experiment cable insulating sheath device is three-decker, and outer layer is insulating layer, and middle layer is copper mesh, and internal layer is insulating layer, the copper
Net at two edges of the cable insulating sheath there is conductor output end, the conductor output end to be directly grounded or by right
Ground discharge loop ground connection.
As a preferred embodiment, the experiment cable insulating sheath device is hollow circular, hollow square or other poroid knots
Structure.
As a preferred embodiment, the experiment cable insulating sheath device is half opening or scalable fixed structure.
As a preferred embodiment, the discharge loop over the ground is short switch, grounded copper wire, the resistance containing ground connection, contains ground connection
Resistance box or vacuum discharge gap module containing ground connection.
As a preferred embodiment, the three phase variable frequency experiment power supply output frequency adjustable extent is 10Hz-5kHz, output voltage
Adjustable extent is 10V-600V.
As a preferred embodiment, each resistance in the fictitious load resistance box can be separately adjustable, resistance
Adjustable extent is 0-500 ohm.
As a preferred embodiment, the resistance in the fictitious load resistance box is pure resistance, capacitance resistance or the compound resistance of inductance
Anti- unit, capacitance adjustable extent are 0-10uF, and inductance adjustable extent is 0-100mH.
As a preferred embodiment, the low-pressure side wiring load combinations switch passes through knob manually or numerical control pattern realizes wiring
Switching.
The beneficial effects of the present invention are：
（1）The present invention proposes that a kind of transformer connection fault testing apparatus is overcome the prior art and carried out using low voltage experiment
Directly to transformer according to security risk caused by nominal working conditions boosting up-flow when power transformer commissioning test.
（2）The present invention can simulate the failure of terminal connections, can repeat to demonstrate, improve the efficiency of the debugging at scene,
While realizing Site Detection wiring error, additionally it is possible to scene carry out wiring detection technical training with exchange.
（3）The present invention is provided with experiment cable insulating sheath device, can exclude interference of the live crosstalk voltage to test,
It avoids crosstalk high voltage to testing the damage of system, and ensures the personal safety of site operation personnel.
Description of the drawings
Fig. 1 is a kind of one structure chart of transformer connection fault testing apparatus embodiment provided by the invention.
Fig. 2 is a kind of two structure chart of transformer connection fault testing apparatus embodiment provided by the invention.
Fig. 3 is the axial, cross-sectional view for testing cable insulating sheath device.
Fig. 4 is the longitudinal section view for testing cable insulating sheath device.
Specific implementation mode
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control illustrates this hair
Bright specific implementation mode.
A kind of transformer connection fault testing apparatus embodiment one provided by the invention is as shown in Figure 1.A kind of transformer connects
Line fault testing apparatus includes that three phase variable frequency experiment power supply, experiment cable, three-phase collector, low-pressure side wiring load group are run jointly
Pass, fictitious load resistance box, control device, test and control software, three phase variable frequency experiment power supply output end is by testing cable
It is connect with the high-pressure side of subject transformer, the low-pressure side for being tested transformer passes through low-pressure side wiring load combinations by testing cable
Switch is connect with fictitious load resistance box, and the high-pressure side for being tested transformer is connected to three-phase by testing cable after decompression couples
Collector, three-phase collector are also set by the low-pressure side or fictitious load resistance box, control of testing cable connection subject transformer
It is standby to be separately connected three-phase collector and three phase variable frequency experiment power supply；Three phase variable frequency experiment power supply is controlled by control device, is realized defeated
Go out the adjusting of frequency and output voltage；Low-pressure side wiring load combinations switch is for realizing examination step down side three-phase output line
Road and the wiring of fictitious load resistance box switch, and to change the phase sequence of output end, realize wiring faults simulation；Fictitious load electricity
It includes at least three groups of resistance to hinder case, for realizing the star-like load connection of three-phase or the connection of three-phase triangular load；Three-phase collector
Three-phase current and voltage for acquiring subject high voltage side of transformer and low-pressure side or load-side；Control device be industrial personal computer or
Microcontroller, test is deployed in control software on industrial personal computer, or is deployed on the host computer communicated to connect with control device, is tested
It is used to be arranged the output frequency of three phase variable frequency experiment power supply and the sample rate of three-phase collector with control software, control control is set
The standby information exchange with three-phase collector, and collected three-phase voltage and electric current are processed and displayed.
Wherein, due to the three-phase collector synchronous acquisition high voltage side current and voltage of three-phase transformer, low-pressure side or negative
Carry side electric current and voltage, the acquisition channel that three-phase collector can be arranged is at least 12 channels, wherein high-pressure side three-phase voltage and
Electric current is 6 channels, low-pressure side or load-side three-phase voltage and electric current is 6 channels.
As a kind of preferred embodiment, three phase variable frequency experiment power supply output frequency adjustable extent is 10Hz-5kHz, output electricity
Pressure adjustable extent is 10V-600V.
It can be effective against live interference by the method for improving and changing test frequency, and change the excitation of transformer
Operating point, to effectively reduce test voltage.According to the empirical data that inventor tests, the present invention proposes relevant frequency conversion examination
The frequency range tested.Moreover, frequency conversion experiment power supply of the present invention can also be used for the test of multiple Frequency points, finally converge
The data of total different frequency point carry out more deep analysis, and it is preferable perspective that this so that the present invention has.
As a kind of preferred embodiment, each resistance in fictitious load resistance box can be separately adjustable, Neng Goushi
The test of existing three-phase imbalance load.Resistance adjustable extent is 0-500 ohm.
As a kind of preferred embodiment, the resistance in the fictitious load resistance box is pure resistance, capacitance resistance or inductance
Composite impedance unit, capacitance adjustable extent are 0-10uF, and inductance adjustable extent is 0-100mH.
As a kind of preferred embodiment, low-pressure side wiring load combinations switch passes through knob manually or the realization of numerical control pattern connects
Line switches.
When carrying out on-the-spot test, an example is：Low-pressure side wiring load combinations are arranged to switch, by A phases and B phase voltages
It exchanges, C phases are constant, and the threephase load resistance value of adjustment fictitious load resistance box is zero, i.e. short-circuit condition, and three-phase transformer is arranged
No-load voltage ratio is 500:1, the controlled frequency of setting three phase variable frequency experiment power supply is 300Hz, voltage 500V, then three-phase voltage output
To after subject three-phase transformer, low-pressure side voltage 1V.Threephase load case is short-circuit condition, and it is defeated to be thus tested step down side
The load of outlet is only the resistance value of output connection, and the resistance value is very small, is set as 0.5 ohm, then low-pressure side current value is 1V/
0.5=2 ampere.When testing ground all power failures, and there is no in the case of high voltage crosstalk couplings, above scheme can meet existing
The demand of field test.
But inventor has found in practical R＆D process, live low voltage experiment can also have coupling although with the obvious advantage
The case where closing neighbouring high voltage causes high voltage to damage equipment, jeopardizes personal safety, therefore in the method item for taking into account low voltage experiment
Under part, it is necessary to take safety problem into account.
To solve the above problems, a kind of transformer connection fault testing apparatus embodiment two such as Fig. 2 institutes provided by the invention
Show.On the basis of the above embodiments, transformer connection fault testing apparatus further includes experiment cable insulating sheath device, experiment
Cable insulating sheath device is set in outside the experiment cable being connect with subject high voltage side of transformer and low-pressure side, and experiment cable is exhausted
Edge sheath device is three-decker, and outer layer is insulating layer, and middle layer is copper mesh, and internal layer is insulating layer, and copper mesh is protected in cable insulating
There is conductor output end, conductor output end to be directly grounded or are grounded by discharge loop over the ground at two edges of set.
It is shielded cable that experiment cable insulating sheath device, which plays a role, the voltage string in especially parallel multiply region
It disturbs.In the setting of three-decker：Outer layer uses insulating rubber material, can tolerate the insulation voltage of 100kV or more；Middle level uses
The shielded layer of flexible copper web frame；Internal layer pours isolation using electro-insulating rubber or flexible insulating material.
Entire experiment cable insulating sheath device is hollow structure, before testing protects test lead from experiment cable insulating
Covering device hollow position passes through, then tests cable insulating sheath device and just can be used as the main body insulation load for undertaking coupled outside voltage
Body.Under this condition, it tests the copper mesh inside cable insulating sheath device and remains conductor structure, with neighbouring electrification in high voltage circuit
High voltage coupling may still occur, thus when coupled voltages are excessively high, when by separation layer insulation breakdown, high voltage will not draw
Enter test lead, but is grounded or through copper mesh and gap discharge progress energy by testing the copper mesh inside cable insulating sheath device
Amount release.At this point, the multiply test circuit bulk potential being inserted in inside experiment cable insulating sheath device is zero, to protect
Test circuit is not influenced itself by coupled voltages, not only protects equipment safety, but also protect personal safety.
As a kind of preferred embodiment, experiment cable insulating sheath device is hollow circular, hollow square or other are poroid
Structure.
As a kind of preferred embodiment, experiment cable insulating sheath device is half opening or scalable fixed structure.
As a kind of preferred embodiment, over the ground discharge loop be short switch, grounded copper wire, the resistance containing ground connection, containing connecing
The resistance box on ground or vacuum discharge gap module containing ground connection.
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, therefore equivalent changes made in accordance with the claims of the present invention, is still within the scope of the present invention.
Claims (9)
1. a kind of transformer connection fault testing apparatus, which is characterized in that including three phase variable frequency experiment power supply, experiment cable, three
Phase collector, low-pressure side wiring load combinations switch, fictitious load resistance box, control device, test and control software, described three
Phase inverter experiment power supply output end is connect by the experiment cable with the high-pressure side for being tested transformer, the subject transformer
Low-pressure side is switched by the low-pressure side wiring load combinations by the experiment cable and is connect with the fictitious load resistance box,
The high-pressure side of the subject transformer is connected to the three-phase collector by the experiment cable after decompression coupling, and described three
Phase collector also connects the low-pressure side of the subject transformer or the fictitious load resistance box by the experiment cable, described
Control device is separately connected the three-phase collector and the three phase variable frequency experiment power supply；
The three phase variable frequency experiment power supply is controlled by the control device, realizes the adjusting of output frequency and output voltage；
The low-pressure side wiring load combinations switch is for realizing the examination step down side three-phase outlet line and the mould
The wiring switching of quasi- load resistance box；
The fictitious load resistance box includes at least three groups of resistance, negative for realizing the star-like load connection of three-phase or three-phase triangle
Carry connection；
The three-phase collector for acquire the subject high voltage side of transformer and the three-phase current of low-pressure side or load-side with
Voltage；
The control device is industrial personal computer or microcontroller, and the test is deployed in control software on the industrial personal computer, or deployment
In on the host computer communicated to connect with the control device, the test is tested with control software for the three phase variable frequency to be arranged
The sample rate of the output frequency of power supply and the three-phase collector controls the letter of the control device and the three-phase collector
Breath interaction, and collected three-phase voltage and electric current are processed and displayed.
2. a kind of transformer connection fault testing apparatus as described in claim 1, which is characterized in that further include that experiment cable is exhausted
Edge sheath device, the experiment cable insulating sheath device is set in be connect with the subject high voltage side of transformer and low-pressure side
It tests outside cable, the experiment cable insulating sheath device is three-decker, and outer layer is insulating layer, and middle layer is copper mesh, interior
Layer is insulating layer, and the copper mesh has conductor output end, the conductor output end at two edges of the cable insulating sheath
It is directly grounded or is grounded by discharge loop over the ground.
3. a kind of transformer connection fault testing apparatus as claimed in claim 2, which is characterized in that the experiment cable insulating
Sheath device is hollow circular, hollow square or other cavernous structures.
4. a kind of transformer connection fault testing apparatus as claimed in claim 2, which is characterized in that the experiment cable insulating
Sheath device is half opening or scalable fixed structure.
5. a kind of transformer connection fault testing apparatus as claimed in claim 2, which is characterized in that the discharge loop over the ground
For short switch, grounded copper wire, the resistance containing ground connection, the resistance box containing ground connection or the vacuum discharge gap module containing ground connection.
6. a kind of transformer connection fault testing apparatus as described in claim 1, which is characterized in that the three phase variable frequency experiment
Power supply output frequency adjustable extent is 10Hz-5kHz, and output voltage adjustable extent is 10V-600V.
7. a kind of transformer connection fault testing apparatus as described in claim 1, which is characterized in that the fictitious load resistance
Each resistance in case can be separately adjustable, and resistance adjustable extent is 0-500 ohm.
8. a kind of transformer connection fault testing apparatus as described in claim 1, which is characterized in that the fictitious load resistance
Resistance in case is pure resistance, capacitance resistance or inductance composite impedance unit, and capacitance adjustable extent is 0-10uF, inductance is adjustable model
It encloses for 0-100mH.
9. a kind of transformer connection fault testing apparatus as described in claim 1, which is characterized in that the low-pressure side wiring is negative
Carry stacked switch by knob manually or numerical control pattern realize wiring switching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810355724.6A CN108535587B (en) | 2018-04-19 | 2018-04-19 | Transformer wiring fault testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810355724.6A CN108535587B (en) | 2018-04-19 | 2018-04-19 | Transformer wiring fault testing device |
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| Publication Number | Publication Date |
|---|---|
| CN108535587A true CN108535587A (en) | 2018-09-14 |
| CN108535587B CN108535587B (en) | 2021-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810355724.6A Active CN108535587B (en) | 2018-04-19 | 2018-04-19 | Transformer wiring fault testing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285616A (en) * | 2020-09-24 | 2021-01-29 | 国网河北省电力有限公司 | Method and device for rapidly judging internal fault of electrical equipment |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN108535587B (en) | 2021-05-14 |
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