CN104502769B - Check test loop and the method for the anti-short-circuit protector of voltage transformer secondary - Google Patents
Check test loop and the method for the anti-short-circuit protector of voltage transformer secondary Download PDFInfo
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- CN104502769B CN104502769B CN201410835465.9A CN201410835465A CN104502769B CN 104502769 B CN104502769 B CN 104502769B CN 201410835465 A CN201410835465 A CN 201410835465A CN 104502769 B CN104502769 B CN 104502769B
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- 230000001012 protector Effects 0.000 title claims abstract description 40
- 230000000875 corresponding Effects 0.000 claims abstract description 12
- 230000001105 regulatory Effects 0.000 claims abstract description 10
- 238000011084 recovery Methods 0.000 claims description 26
- 238000005070 sampling Methods 0.000 claims description 23
- 238000007689 inspection Methods 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 6
- 238000009530 blood pressure measurement Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- 238000004088 simulation Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
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Abstract
The invention provides a kind of test loop for checking the anti-short-circuit protector of voltage transformer secondary and method, test loop mainly includes being provided for voltage transformer to be measured voltage source, analog switch, voltage sensor, current sensor, photoelectric sensor, digital storage oscilloscope, the test module of voltage；The protector two ends of tested voltage transformer are parallel with the load of protection act indicator, voltage sensor, analog switch and voltage transformer, and the output end of the protector is in series with current sensor；The output end of the current sensor and voltage sensor is connected with digital storage oscilloscope, and to show corresponding electric current and voltage waveform, the protection act indicator is connected on digital storage oscilloscope by photoelectric sensor；The output end of the digital storage oscilloscope is connected with test module, and the test module is further connected to ensure that tested voltage transformer is applied in suitable voltage with voltage regulating device.
Description
Technical field
The invention belongs to voltage transformer technical field, more particularly to a kind of inspection anti-short-circuit protection of voltage transformer secondary
The test loop of device and method.
Background technology
Voltage transformer is also known as instrument transformer.It is it is a kind of high voltage is changed into proportion low-voltage and in phase and
Originally the instrument of certain relation was kept.Its operation principle, construction and the mode of connection are all identical with transformer, and simply capacity is smaller,
Generally only have tens or hundreds of volt-amperes.Its purposes is that high voltage is reduced according to a certain percentage, enables low-voltage coil accurate
The change of ground reflection high voltage value, to solve the difficulty of high voltage measuring.Simultaneously as it has reliably isolated high voltage,
So as to ensure that the safety of survey crew and instrument and protection device.Additionally, the secondary voltage of voltage transformer is 100V, this
Sample can standardize instrument and relay.
Voltage transformer secondary short circuit, can make secondary coil produce very big short circuit current, scaling loss voltage transformer coil, with
Can extremely cause first and second to puncture, make relevant protection misoperation, instrument is without instruction.Because voltage transformer impedance very little, one in itself
Secondary side is constant voltage source, if after second short circuit, very big short circuit current can be produced in secondary coil under constant voltage source effect, is burnt
Transformer is damaged, insulation is damaged, first and second punctures.
Therefore, occurring in that the anti-short-circuit protector of voltage transformer secondary, its function is after voltage transformer secondary short circuit
Quick limitation second short circuit electric current, prevents secondary big circuit scaling loss transformer, and provides alarm signal, works as voltage transformer secondary
After short circuit accident is released, fast quick-recovery is normally exported.
In order to solve to realize the performance detection of the anti-short-circuit protector of voltage transformer secondary, this patent provides its inspection party
Method, gives the pilot system of the inspection anti-short-circuit protector performance of voltage transformer secondary.
The content of the invention
The invention provides a kind of test loop for checking the anti-short-circuit protector of voltage transformer secondary and method, with effective
Inspection the anti-short-circuit protector of voltage transformer secondary operating time of protection, short-circuit condition under electric current, protection act after
Electric current, the state of the luminous alarm indicator of protection device；Short circuit recovers the parameters such as voltage, recovery time after releasing.
In order to reach object above, the present invention is adopted the following technical scheme that and is achieved：
A kind of test loop of the inspection anti-short-circuit protector of voltage transformer secondary, it is main to include being voltage transformer to be measured
And secondary anti-short-circuit protector provide the voltage source of voltage, analog switch, voltage sensor, current sensor, photoelectric sensor,
Digital storage oscilloscope, test module；The protector two ends of tested voltage transformer are parallel with protection act indicator, voltage and pass
Sensor, analog switch and voltage transformer load, the output end of the protector are in series with current sensor；The current sense
The output end of device and voltage sensor is connected with digital storage oscilloscope, to show corresponding electric current and voltage waveform, the guarantor
Shield precedence indicator is connected on digital storage oscilloscope by photoelectric sensor；The output end of the digital storage oscilloscope connects
Test module is connected to, the test module is further connected to ensure that tested voltage transformer is applied in voltage regulating device
Suitable voltage.
The voltage source includes being connected in parallel on successively voltage regulating device, the increasing apparatus at tested voltage transformer two ends, with
And high-pressure measurement mechanism.
A kind of test method of the inspection anti-short-circuit protector of voltage transformer secondary, closes suddenly analog switch, simulation electricity
The pressure secondary output terminal shortcircuit of transformer, the current signal of sampling voltage transformer, the sampling voltage signal of secondary voltage sensor,
And shown by waveform；After closure analog switch, analog switch is thrown open, the secondary output of analog voltage transformer is turned by short circuit
It is normal operating conditions, the current signal of sampling voltage transformer, the sampling voltage signal of secondary voltage sensor, and by ripple
Shape shows that test module judges alarm hair respectively according to correspondence waveshape operating time of protection, protection act recovery time
The quality of light state, last join protection actuation time and protection act recovery time judge the quality of anti-short-circuit protector.
Before experiment, test module sends instruction according to tested voltage transformer to voltage source first, to ensure voltage source
Suitable voltage is provided to tested voltage transformer.
The test module calculates operating time of protection and the method for protection act recovery time is：After extracting respective action
Current amplitude, then according to corresponding logical relation calculate operating time of protection or protection act recovery time.
The computational methods of the operating time of protection are：The current amplitude gathered during for simulating secondary output terminal shortcircuit,
It is determined that counted to secondary current when normal voltage switchs to short-circuit voltage from voltage transformer secondary voltage being changed into from short circuit current
The time t of the low current under guard mode, the time, t was exactly operating time of protection.
The computational methods of the protection act recovery time are：Adopted for simulating when secondary output end switchs to normal by short circuit
The current amplitude of collection, it is determined that the secondary output voltage counted to voltage transformer from voltage transformer secondary current break is normal
Sinusoidal waveform time t, the time is exactly to protect recovery time.
Tested when the voltage in tested voltage transformer reaches 80%, 100%, the 120% of rated voltage respectively, only
Have when being met the requirements under three kinds of voltage, just can determine that the anti-short-circuit protector for qualified, it is otherwise unqualified.
Compared with prior art, the present invention at least has the advantages that：Test loop of the present invention is mainly included to treat
Survey voltage transformer and secondary anti-short-circuit protector provides voltage source, analog switch, voltage sensor, the current sense of voltage
Device, photoelectric sensor, digital storage oscilloscope, test module；It is dynamic that the protector two ends of tested voltage transformer are parallel with protection
Make the load of indicator, voltage sensor, analog switch and voltage transformer, the output end of the protector is in series with current sense
Device；The output end of the current sensor and voltage sensor is connected with digital storage oscilloscope, with show corresponding electric current and
Voltage waveform, the protection act indicator is connected on digital storage oscilloscope by photoelectric sensor；The stored digital
The output end of oscillograph is connected with test module, and the test module is further connected tested to ensure with voltage regulating device
Voltage transformer is applied in suitable voltage.During experiment, analog switch is first closed, the secondary output end of analog voltage transformer is short
Road, the current signal of sampling voltage transformer, the sampling voltage signal of secondary voltage sensor, and shown by waveform；Closure
After analog switch, analog switch is thrown open, the secondary output of analog voltage transformer switchs to normal operating conditions, samples by short circuit
The current signal of voltage transformer, the sampling voltage signal of secondary voltage sensor, and shown by waveform, test module difference
According to correspondence waveshape operating time of protection, protection act recovery time, and judge to alert the quality of luminance, finally tie
Close operating time of protection and protection act recovery time judges the quality of anti-short-circuit protector.
Brief description of the drawings
Fig. 1 is the pilot system figure of the present invention inspection anti-short-circuit protector of voltage transformer secondary.
To determine guard time oscillogram, curve 1 is voltage transformer secondary output voltage waveforms to Fig. 2, and curve 2 is voltage
The secondary output current wave figure of transformer, t is operating time of protection.
Fig. 3 short-circuit alarmings lamp indicates functional check waveform.Curve 1 is voltage transformer secondary output voltage waveforms, curve 2
It is the output waveform of photoelectric sensor.
To determine recovery time oscillogram, curve 1 is that voltage transformer secondary output voltage waveforms curve 2 is voltage to Fig. 4
The secondary output current wave figure of transformer, t is protection recovery time.
Fig. 5 is test module block diagram.
In figure：1st, voltage regulating device；2nd, increasing apparatus；3rd, high-pressure measurement mechanism；4th, current sensor；5th, voltage sensor
Device；6th, analog switch；7th, digital storage oscilloscope 8, test module；9th, voltage transformer load；10th, it is tested voltage transformer；
11st, it is tested the anti-short-circuit protector of voltage transformer；12nd, protection act indicator；13rd, photoelectric sensor.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
The characteristic for characterizing the anti-short-circuit protector of voltage transformer secondary mainly has：Operating time of protection, guard mode, short circuit
The electric current after electric current, protection act under state, the state of the luminous alarm indicator of protection device；Short circuit recovers electricity after releasing
The parameters such as pressure, recovery time.
The invention discloses a kind of test loop for checking the anti-short-circuit protector of voltage transformer secondary and method.Test back
Road is main by voltage regulating device 1, increasing apparatus 2, analog switch 6, voltage sensor 5, current sensor 4, photoelectric sensor
13rd, digital storage oscilloscope 7, test module 8 are constituted.It is mutual that the voltage regulating device 1 and increasing apparatus 2 are connected in parallel on tested voltage
The two ends of sensor, for voltage transformer provides suitable magnitude of voltage；The two ends of the protector 11 of tested voltage transformer are parallel with
Protection act indicator 12, voltage sensor 5, analog switch 6 and voltage transformer load 9, the output end of the protector 11
It is in series with current sensor 4；The output end of the current sensor 4 and voltage sensor 5 is connected with digital storage oscilloscope 7,
To show corresponding electric current and voltage waveform, the protection act indicator 12 is connected to stored digital by photoelectric sensor 13
On oscillograph 7；The output end of the digital storage oscilloscope is connected with test module 8, the test module further with voltage
Adjusting means connects to ensure that tested voltage transformer is applied in suitable voltage.
Adjusting means 1 and increasing apparatus 2 according to test module 8 by voltage Tiao Jiedao required voltage values, by analog switch 6
Suddenly the closure secondary output terminal shortcircuit of analog voltage transformer, is sensed by the sampling current signal of current sensor 4, secondary voltage
The sampling voltage signal of device 5, is input to the electric current and voltage signal of sampling digital storage oscilloscope 7 and records corresponding waveform,
And electric current under the data transfer of digital storage oscilloscope 7 to test module is calculated into operating time of protection, short-circuit condition, protect
The parameters such as the electric current after shield action.The luminous alarm function of protection act state is observed by photoelectric sensor 13.By analog switch 6
Throw open, the secondary output of analog voltage transformer switchs to normal operating conditions by short circuit, similar to short-circuit condition, by electric current
The sampling current signal of sensor 4, the sampling voltage signal of secondary voltage sensor 5, electric current and the voltage signal input that will be sampled
Corresponding waveform is recorded to digital storage oscilloscope 7, and the data transfer of digital storage oscilloscope 7 is calculated to test module
Protection recovery time parameter.
The method of inspection is：First, test module is according to the tested control voltage adjusting means 1 of voltage transformer 10 and boosting
Device 2 provides tested voltage transformer suitable voltage；Secondly, using the short-circuit condition of the analog voltage transformer of analog switch 6
With recovery state.Analog switch 6 is closed suddenly under the different output voltage of voltage transformer, analog voltage transformer is secondary
Output short-circuit, using current sense 4 by the electric current under short-circuit condition, the input digital storage oscilloscope 7 of the electric current after protection act,
Corresponding waveform is recorded, measurement module extracts electric current, the current amplitude after protection act under short-circuit condition on oscillogram, then
The moment for switching to short-circuit voltage by normal voltage according to the voltage waveform for measuring and the current waveform for measuring are changed to short circuit by zero-turn
The moment logical relation of electric current measures operating time of protection, while the alarm using the measurement protection act of photoelectric sensor 13 lights
State.
Analog switch is thrown open from short-circuit condition, the secondary output end of analog voltage transformer is returned to by short-circuit condition
Normal condition, by voltage sensor and the secondary voltage and load current of current sensor collection voltages transformer, is deposited by numeral
Storage the corresponding waveform of oscillograph recording, measurement module read on oscillogram switched to by short-circuit condition under normal condition electric current,
The secondary output voltage amplitude of transformer after protection act, according to the current waveform for measuring by short circuit current switch to zero moment and
The voltage waveform for measuring measures the recovery action time by the moment logical relation that zero-turn is changed to normal voltage.
The service check of the anti-short-circuit protector of voltage transformer secondary is completed according to the above method.
Referring to Fig. 1, adjusting voltage supply increasing apparatus 2 by voltage regulating device 1 makes the voltage of tested voltage transformer 10
80%, 100%, the 120% of rated voltage is respectively reached, high-pressure measurement mechanism 3 measures the output voltage of increasing apparatus 2.Work as quilt
When examination voltage transformer reaches 80%, 100%, the 120% of the rated voltage of regulation with nominal load 9 and applied voltage, by mould
Intend the closure secondary output terminal shortcircuits of analog voltage transformer suddenly of switch 6, by the sampling current signal of current sensor 4, secondary
The sampling voltage signal of voltage sensor 5, is input to the electric current and voltage signal of sampling digital storage oscilloscope 7 and records accordingly
Waveform, and by the data transfer of digital storage oscilloscope 7 to test module 8, the secondary output voltage of comparison voltage transformer and
Short circuit current waveform, as shown in Fig. 2 determination count when switching to short-circuit voltage by normal voltage from voltage transformer secondary voltage to
Secondary current guard mode is changed into from short circuit current under low current time t, the time is exactly operating time of protection, by electric current
Waveform determines the current amplitude under short-circuit condition, the current amplitude after protection act；As shown in figure 3, by photoelectric sensor 13
It is bright that output voltage switchs to high level explanation alarm lamp by low level, it was demonstrated that the luminous alarm function of protection act indicator 12 is just
Often.
See also Fig. 1, adjusting voltage supply increasing apparatus 2 by voltage regulating device 1 makes the electricity of tested voltage transformer
Pressure respectively reaches 80%, 100%, the 120% of rated voltage, and high-pressure measurement mechanism 3 measures the output voltage of increasing apparatus.Work as quilt
When examination voltage transformer reaches 80%, 100%, the 120% of the rated voltage of regulation, analog switch 6 is closed, analog voltage is mutual
The secondary output terminal shortcircuit of sensor, switchs to open mode by analog switch 6 by closure state suddenly, and analog voltage transformer is secondary defeated
Go out end and normal state is switched to by short circuit, by the sampling current signal of current sensor 4, the sampling voltage of secondary voltage sensor 5
Signal, is input to the electric current and voltage signal of sampling digital storage oscilloscope and records corresponding waveform, and stored digital is shown
The data transfer of ripple device to test module, the secondary output current wave of comparison voltage transformer and voltage transformer it is secondary defeated
Go out voltage, as shown in figure 4, measurement determines the secondary output electricity counted from voltage transformer secondary current break to voltage transformer
The time t for normal sinusoidal waveform is pressed, the time is exactly to protect recovery time.
If the guard time being calculated is less than specified guard time, the protection recovery time being calculated is less than volume
Fixed protection recovery time, and alarm generation within the time of regulation, then illustrate that at this voltage, tested protector is to meet
It is required that.In the case of 80%, 100%, 120% that the voltage of tested voltage transformer respectively reaches rated voltage, it is tested
Protector when meeting the requirements, judge that the protector meets the requirements, it is otherwise undesirable.
Fig. 5 gives test module block diagram, by the module, can complete parameter setting, control measurement process, extract test
Data, and data processing is carried out as required, export original record.
The function of parameter setting module 13 is mainly proportionality coefficient, the ratio of voltage sensor 5 for setting current sensor 4
The sensitivity coefficient of coefficient, photoelectric sensor 13, to choose the range ability of suitable digital storage oscilloscope 7, clearly
The tested waveform of display.
The function of instrument controlling module 14 is mainly driving digital storage oscilloscope 7 so that digital storage oscilloscope 7 and survey
Data exchange is completed between die trial block 8, test module 8 completes the setting to digital storage oscilloscope 7.Test module 8 is according to adopting
The data for collecting complete original record and survey report.
Parameter determination module 15 sets true according to the proportionality coefficient of current sensor 4 and the range of digital storage oscilloscope 7
Surely it is tested the amplitude of electric current.Proportionality coefficient, the proportionality coefficient of voltage sensor 5 and stored digital according to current sensor 4 show
Method described in the range setting of ripple device 7 and Fig. 2 determines guard time.Sensitivity coefficient, voltage according to photoelectric sensor 13
Method described in the range setting of the proportionality coefficient and digital storage oscilloscope 7 of sensor 5 and Fig. 3 determines that short-circuit alarming lamp is indicated
Functional check.The amount of proportionality coefficient, the proportionality coefficient of voltage sensor 5 and digital storage oscilloscope 7 according to current sensor 4
Method described in journey setting and Fig. 4 determines recovery time.
The present invention realizes the service check of the anti-short-circuit protector of voltage transformer secondary, realizes automatic measurement, leads to
The setting that man-machine interactive system completes test mission, control and detection are crossed, test efficiency is improve, human error is reduced.
Claims (8)
1. a kind of test loop of the inspection anti-short-circuit protector of voltage transformer secondary, realizes that the anti-short circuit of voltage transformer secondary is protected
Protect the performance detection of device, it is characterised in that：It is main to include being that voltage transformer to be measured and secondary anti-short-circuit protector provide voltage
Voltage source, analog switch (6), voltage sensor (5), current sensor (4), photoelectric sensor (13), stored digital oscillography
Device (7), test module (8)；Protector (11) two ends of tested voltage transformer are parallel with protection act indicator (12), voltage
Sensor (5), analog switch (6) and voltage transformer load (9), the output end of the protector (11) are in series with current sense
Device (4)；The output end of the current sensor (4) and voltage sensor (5) is connected with digital storage oscilloscope (7), to show
Corresponding electric current and voltage waveform, the protection act indicator (12) are connected to stored digital and show by photoelectric sensor (13)
On ripple device (7)；The output end of the digital storage oscilloscope is connected with test module (8), the test module further with electricity
Pressure adjusting means connects to ensure that tested voltage transformer is applied in suitable voltage；Simulated by closure analog switch suddenly
Voltage transformer secondary exports terminal shortcircuit, and by throwing open analog switch, the secondary output of analog voltage transformer is turned by short circuit
It is normal operating conditions, thus various performances of the secondary anti-short-circuit protector of detection voltage transformer.
2. test loop according to claim 1, it is characterised in that：The voltage source includes being connected in parallel on tested voltage successively
The voltage regulating device (1) at transformer two ends, increasing apparatus (2), and high-pressure measurement mechanism (3).
3. the examination of the inspection anti-short-circuit protector of voltage transformer secondary of a kind of test loop based on described in claim 1 or 2
Proved recipe method, it is characterised in that：Suddenly analog switch (6) is closed, the secondary output terminal shortcircuit of analog voltage transformer, sampling voltage is mutual
The current signal of sensor, the sampling voltage signal of secondary voltage sensor, and shown by waveform；After closure analog switch, dash forward
Analog switch is so opened, the secondary output of analog voltage transformer switchs to normal operating conditions by short circuit, sampling voltage transformer
The sampling voltage signal of current signal, secondary voltage sensor, and shown by waveform, test module is respectively according to correspondence waveform
Operating time of protection, protection act recovery time are calculated, and judges to alert the quality of luminance, when last join protection is acted
Between and protection act recovery time judge the quality of anti-short-circuit protector.
4. method according to claim 3, it is characterised in that：Before experiment, test module is mutual according to tested voltage first
Sensor sends instruction to voltage source, to ensure that voltage source provides suitable voltage to tested voltage transformer.
5. method according to claim 3, it is characterised in that：The test module calculates operating time of protection and protection is dynamic
The method for making recovery time is：The current amplitude after respective action is extracted, it is dynamic then to calculate protection according to corresponding logical relation
Make time or protection act recovery time.
6. method according to claim 3, it is characterised in that：The computational methods of the operating time of protection are：For mould
Intend the current amplitude gathered during secondary output terminal shortcircuit, it is determined that switching to short-circuit electricity by normal voltage from voltage transformer secondary voltage
The time t of the low current under being changed into guard mode from short circuit current to secondary current is counted during pressure, the time, t was exactly protection act
Time.
7. method according to claim 3, it is characterised in that：The computational methods of the protection act recovery time are：It is right
The current amplitude gathered when the secondary output end of simulation switchs to normal by short circuit, it is determined that being calculated from voltage transformer secondary current break
The secondary output voltage for playing voltage transformer is the time t of normal sinusoidal waveform, and the time is exactly to protect recovery time.
8. the method according to any one in claim 3 to 7, it is characterised in that：Respectively in tested voltage transformer
Voltage is tested when reaching 80%, 100%, the 120% of rated voltage, when only being met the requirements under three kinds of voltage,
The anti-short-circuit protector be can determine that for qualified, it is otherwise unqualified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410835465.9A CN104502769B (en) | 2014-12-27 | 2014-12-27 | Check test loop and the method for the anti-short-circuit protector of voltage transformer secondary |
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| CN201410835465.9A CN104502769B (en) | 2014-12-27 | 2014-12-27 | Check test loop and the method for the anti-short-circuit protector of voltage transformer secondary |
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| CN104502769A CN104502769A (en) | 2015-04-08 |
| CN104502769B true CN104502769B (en) | 2017-06-16 |
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| CN108181538B (en) * | 2018-03-14 | 2021-01-05 | 华北科技学院 | Intelligent short circuit experiment table |
| CN111381099A (en) * | 2018-12-28 | 2020-07-07 | 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） | Device and method for testing alternating current loss of high-temperature superconducting strip and coil |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102096033A (en) * | 2010-11-27 | 2011-06-15 | 国网电力科学研究院 | Test device for sudden short circuit of voltage transformer |
| CN202133741U (en) * | 2011-06-29 | 2012-02-01 | 中国西电电气股份有限公司 | Test apparatus of short circuit bearing capability of voltage transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH1019961A (en) * | 1996-07-04 | 1998-01-23 | Toshiba Corp | Checking equipment of test plugs for pt and ct |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102096033A (en) * | 2010-11-27 | 2011-06-15 | 国网电力科学研究院 | Test device for sudden short circuit of voltage transformer |
| CN202133741U (en) * | 2011-06-29 | 2012-02-01 | 中国西电电气股份有限公司 | Test apparatus of short circuit bearing capability of voltage transformer |
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