CN109541339A - Power transformer bears short-circuit capacity pilot system - Google Patents
Power transformer bears short-circuit capacity pilot system Download PDFInfo
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- CN109541339A CN109541339A CN201811256095.8A CN201811256095A CN109541339A CN 109541339 A CN109541339 A CN 109541339A CN 201811256095 A CN201811256095 A CN 201811256095A CN 109541339 A CN109541339 A CN 109541339A
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- power
- reactive
- short
- switch
- power transformer
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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
Abstract
The present invention relates to a kind of power transformers to bear short-circuit capacity pilot system, including subject power transformer, the experiment power supply for providing active power for subject power transformer, for providing the automatic Quick reactive-load compensation device and short switch of reactive power for subject power transformer；Experiment power supply, automatic Quick reactive-load compensation device are respectively connected to one end of short switch, and the other end of short switch is connected with subject power transformer, to constitute test loop.Automatic Quick reactive-load compensation device is included for the power factor in real-time measurement test loop and calculates the power-factor measurement unit of reactive power in test loop, exports the switch on-off control unit for controlling signal, the electronics fling-cut switch acted based on control signal according to the calculated reactive power of power-factor measurement unit and for providing the compensation device of different reactive powers.The present invention can be such that the capacity of experiment power supply is greatly lowered, so that experimental condition reduces, be more easier to implement.
Description
Technical field
The invention belongs to electrical test equipment fields, and in particular to a kind of receiving short-circuit capacity for power transformer
The system tested.
Background technique
According to the demand of our national distribution development, guarantee that the safety and stability of supplying power allocation is particularly important.The transformation of distribution
Device plays an important role in distribution operation, therefore the safety and stability of transformer becomes the most important thing.
In operation, the effect in addition to can suffer from various overvoltage still suffers from the impact of short circuit current to transformer.Such as
When transformer operates normally, short trouble occurs suddenly for secondary side, very big overcurrent will occurs in winding.Make in short circuit current
Under, transformer is on the one hand made respectively partly to generate huge electric power, increase transformer winding temperature rapidly, to the greatest extent
Pipe process duration is very short, but is a baptism to transformer receiving short-circuit capacity and temperature capacity.
According to the regulation of GB1094, it is to change that short-circuit test, which is mechanical strength resistance test of the transformer under heavy current,
A kind of examination of depressor manufacture complex art ability and technological level.Therefore power transformer be required to by the standard provide into
The corresponding special test of row and theoretical appraisal, it is qualified or not to verify power transformer.
When carrying out power transformer receiving short-circuit capacity test, the capacity requirement of experiment power supply is all very high.Due to
Short-circuit of power transformer ability test is instantaneous short circuit according to regulatory requirements, and after short circuit instantaneous electricity capacity have it is prominent
The significantly promotion of hair property, the process can generate extremely complex transient state and transient process to power supply system, simultaneously because test
Capacity is also very huge, also results in tremendous influence to the safety and stability of power supply system.Therefore, test at present mostly uses greatly mating
Independent power grid and corresponding power transformer provide experiment power supply.Therefore the experimental condition cost is high, difficulty is big.
For distribution transformer receiving short-circuit capacity test to complete 10kV/315kVA, theoretical calculation capacity of experiment can
Up to 8000kVA.By theoretical calculation and analysis of experiments, in the capacity of experiment of 8000kVA, active power is only 2400kW, sense
Property reactive power be 7631.5kvar, and be only 0.5 second according to the test period of regulatory requirements.According to traditional test side
Method, network system and power transformer should have the capacity not less than 8000kVA, just be able to satisfy the power requirement of test.
Summary of the invention
The object of the present invention is to provide one kind, and experiment power supply capacity requirement can be greatly reduced, so that test is more held
The power transformer easily implemented bears short-circuit capacity pilot system.
In order to achieve the above objectives, the technical solution adopted by the present invention is that:
A kind of power transformer receiving short-circuit capacity pilot system, including it is tested power transformer, for being the subject electric power
Transformer provides the experiment power supply of active power, for providing the automatic quick nothing of reactive power for the subject power transformer
Reactive power compensation installations and short switch；The experiment power supply, the automatic Quick reactive-load compensation device are respectively connected to the short circuit
One end of switch, the other end of the short switch is connected with the subject power transformer, to constitute test loop.
The automatic Quick reactive-load compensation device include by the power factor in test loop described in real-time measurement and based on
Calculate the power-factor measurement unit of reactive power in the test loop, according to the calculated nothing of power-factor measurement unit
Function power and export the switch on-off control unit of control signal, based on the control signal and the electronics fling-cut switch that acts and
It is the power-factor measurement unit, the switch on-off control unit, described for providing the compensation device of different reactive powers
Electronics fling-cut switch and the compensation device are sequentially connected and connect, the power-factor measurement unit, the electronics fling-cut switch point
It is not connected with the test loop.
The short switch uses large capacity phase-selecting switch.
Maximum active power needed for the power supply capacity of the experiment power supply is greater than or equal to the subject power transformer.
The reactive capability of the automatic Quick reactive-load compensation device is greater than or equal to needed for the subject power transformer
Maximum reactive power.
Due to the above technical solutions, the present invention has the following advantages over the prior art: the present invention passes through respectively
Experiment power supply and automatic Quick reactive-load compensation device provide active power and reactive power for subject power transformer, to test
The capacity of power supply can be greatly lowered, so that experimental condition reduces, be more easier to implement.
Detailed description of the invention
Attached drawing 1 is the composition block diagram that power transformer of the invention bears short-circuit capacity pilot system.
Specific embodiment
The invention will be further described for embodiment shown in reference to the accompanying drawing.
Embodiment one: as shown in Fig. 1, a kind of power transformer receiving short-circuit capacity pilot system, including subject electric power
Transformer, experiment power supply, automatic Quick reactive-load compensation device and short switch.Experiment power supply, automatic Quick reactive-load compensation device
It is respectively connected to one end of short switch, the other end of short switch is connected with subject power transformer, to constitute test
Circuit.
Experiment power supply is used to provide active power for subject power transformer comprising independent power grid and corresponding power supply
Transformer.In Selection experiment power supply, it is considered as maximum test active power of its capacity not less than subject power transformer, i.e.,
Maximum active power needed for the power supply capacity of experiment power supply is greater than or equal to subject power transformer.Such as to complete 10kV/
The distribution transformer of 315kVA bears short-circuit capacity test, and the active power of test is 2400kW, then power supply capacity should be big
In the active power, and there are comparable nargin.
Automatic Quick reactive-load compensation device is used to provide reactive power for subject power transformer comprising is sequentially connected and connects
Power-factor measurement unit, switch on-off control unit, electronics fling-cut switch and compensation device, wherein power-factor measurement list
Member, electronics fling-cut switch are connected with test loop respectively, that is, are connected to the company of experiment power supply and short switch in test loop
Connect section.Power-factor measurement unit is for the power factor in real-time measurement test loop and calculates idle function in test loop
Rate, switch on-off control unit are used to export control signal according to the calculated reactive power of power-factor measurement unit, electricity
Sub- fling-cut switch is then based on control signal and acts, and compensation device is for providing different reactive powers.To be opened when electronics switching
When closing the different movements of generation, corresponding benefit can be generated by required reactive power corresponding compensation device access test loop
Reactive power is repaid, so that the reactive power that experiment power supply provides reaches minimum.When selecting automatic Quick reactive-load compensation device, answer
Consider maximum test reactive power of its capacity not less than test item, i.e., the reactive capability of automatic Quick reactive-load compensation device is greater than
Or equal to maximum reactive power needed for subject power transformer.The distribution transformer for such as carrying out 10kV/315kVA bears short circuit
When ability test, the reactive capability of automatic Quick reactive-load compensation device should be not less than 7631.5kvar, and there are comparable nargin.
It should be noted that being sudden short-circuit test since power transformer bears short-circuit capacity test, to reduce instantaneous short circuit pair
It is influenced caused by experiment power supply, the corresponding time of automatic Quick reactive-load compensation device should control within several milliseconds.
Short switch use large capacity phase-selecting switch, closure and cut-off relative to the phase of power supply be it is fully controllable,
Test item can be tested in this way in out of phase short circuit, the difference and the difference pair of the amplitude of short circuit size of generation
The influence for bearing short-circuit capacity test of test item.
Above-mentioned power transformer is born in short-circuit capacity pilot system, provides electricity required for test loop as experiment power supply
Source, by the switching of large capacity phase-selecting switch (short switch) supply subject power transformer, phase-selecting switch is according to the electricity of setting
The phase angle of source voltage, closing and opening test power supply measure test to transformer, automatic Quick reactive-load compensation device is tested real-time, quickly
Power supply output, that is, power factor when being tested the power factor of transformer input power, the especially instantaneous switching of phase-selecting switch
Variation, since switch on-off can instantaneously lead to the sharp increase of test loop inductive reactive power, automatic Quick reactive-load compensation device is answered at this time
Corresponding capacitive reactive power is provided within several milliseconds to compensate, and test loop wattful power is only needed provide with guarantee test power supply
Rate substantially reduces the capacity of experiment power supply, meets entire capacity of experiment demand.Therefore the power transformer bears short-circuit capacity test
The beneficial effect of system is: 1, using automatic express delivery reactive power compensator, greatly reducing and provide required for experiment power supply
Power supply capacity so that experiment power supply condition greatly lowers；2, short switch uses phase-selecting switch, can be carried out according to setting phase
Short circuit, the test situation of the receiving short-circuit capacity of subject power transformer when testing out of phase short circuit.
The power transformer bears short-circuit capacity pilot system when generating large capacity inductive reactive power, by reactive power compensator
Automatically the capacitive reactive power for quickly providing suitable capacity compensates, so that experiment power supply only needs to provide active power.
According to the analysis of experiments for 10kV/315kVA it is found that the capacity of power supply grid power supply and corresponding power transformer can be substantially
Degree reduces, so that experimental condition reduces, is more easier to implement.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention
Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.
Claims (5)
1. a kind of power transformer bears short-circuit capacity pilot system, it is characterised in that: the power transformer bears short-circuit energy
Power pilot system include be tested power transformer, for for it is described be tested power transformer provide active power experiment power supply,
For providing the automatic Quick reactive-load compensation device and short switch of reactive power for the subject power transformer；The test
Power supply, the automatic Quick reactive-load compensation device are respectively connected to one end of the short switch, the short switch it is another
End is connected with the subject power transformer, to constitute test loop.
2. power transformer according to claim 1 bears short-circuit capacity pilot system, it is characterised in that: described automatic fast
Fast reactive power compensator includes for the power factor in test loop described in real-time measurement and calculating nothing in the test loop
The power-factor measurement unit of function power exports control letter according to the calculated reactive power of power-factor measurement unit
Number switch on-off control unit, based on the control signal and the electronics fling-cut switch that acts with for providing Bu Tong idle function
The compensation device of rate, the power-factor measurement unit, the switch on-off control unit, the electronics fling-cut switch and described
Compensation device is sequentially connected and connects, the power-factor measurement unit, the electronics fling-cut switch respectively with the test loop phase
Connection.
3. power transformer according to claim 1 or 2 bears short-circuit capacity pilot system, it is characterised in that: described short
Way switch uses large capacity phase-selecting switch.
4. power transformer according to claim 1 bears short-circuit capacity pilot system, it is characterised in that: the test electricity
Maximum active power needed for the power supply capacity in source is greater than or equal to the subject power transformer.
5. power transformer according to claim 1 bears short-circuit capacity pilot system, it is characterised in that: described automatic fast
Maximum reactive power needed for the reactive capability of fast reactive power compensator is greater than or equal to the subject power transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811256095.8A CN109541339A (en) | 2018-10-26 | 2018-10-26 | Power transformer bears short-circuit capacity pilot system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811256095.8A CN109541339A (en) | 2018-10-26 | 2018-10-26 | Power transformer bears short-circuit capacity pilot system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109541339A true CN109541339A (en) | 2019-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811256095.8A Pending CN109541339A (en) | 2018-10-26 | 2018-10-26 | Power transformer bears short-circuit capacity pilot system |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201637799U (en) * | 2010-04-07 | 2010-11-17 | 蒋光祖 | Rated load short circuit and temperature rise testing device of ultrahigh-capacity single-phase transformer |
| CN201868890U (en) * | 2010-11-30 | 2011-06-15 | 辽宁汇丰实业有限公司 | Intelligent compensation device for low-voltage follower |
| CN201928033U (en) * | 2010-12-28 | 2011-08-10 | 苏州华电电气股份有限公司 | Automatic compensating device for step-up transformer low voltage side |
| CN102680861A (en) * | 2011-03-15 | 2012-09-19 | 沈阳变压器研究院股份有限公司 | System and method for testing short circuit withstanding capability of transformer or electric reactor |
| CN205246826U (en) * | 2015-12-17 | 2016-05-18 | 中国西电电气股份有限公司 | Circuit breaker short circuit ability test circuit |
| CN107144758A (en) * | 2017-05-25 | 2017-09-08 | 云南电网有限责任公司电力科学研究院 | The test method that a kind of fuel factor influences on transformer anti-short circuit capability |
| CN108132422A (en) * | 2017-12-13 | 2018-06-08 | 哈尔滨理工大学 | A kind of monitoring system and method for capacitive reactive power compensation device failure |
| CN108363001A (en) * | 2018-01-29 | 2018-08-03 | 温州大学 | A kind of low-voltage circuit breaker short-circuit test system and its impedance self-adaptive bearing calibration |
-
2018
- 2018-10-26 CN CN201811256095.8A patent/CN109541339A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201637799U (en) * | 2010-04-07 | 2010-11-17 | 蒋光祖 | Rated load short circuit and temperature rise testing device of ultrahigh-capacity single-phase transformer |
| CN201868890U (en) * | 2010-11-30 | 2011-06-15 | 辽宁汇丰实业有限公司 | Intelligent compensation device for low-voltage follower |
| CN201928033U (en) * | 2010-12-28 | 2011-08-10 | 苏州华电电气股份有限公司 | Automatic compensating device for step-up transformer low voltage side |
| CN102680861A (en) * | 2011-03-15 | 2012-09-19 | 沈阳变压器研究院股份有限公司 | System and method for testing short circuit withstanding capability of transformer or electric reactor |
| CN205246826U (en) * | 2015-12-17 | 2016-05-18 | 中国西电电气股份有限公司 | Circuit breaker short circuit ability test circuit |
| CN107144758A (en) * | 2017-05-25 | 2017-09-08 | 云南电网有限责任公司电力科学研究院 | The test method that a kind of fuel factor influences on transformer anti-short circuit capability |
| CN108132422A (en) * | 2017-12-13 | 2018-06-08 | 哈尔滨理工大学 | A kind of monitoring system and method for capacitive reactive power compensation device failure |
| CN108363001A (en) * | 2018-01-29 | 2018-08-03 | 温州大学 | A kind of low-voltage circuit breaker short-circuit test system and its impedance self-adaptive bearing calibration |
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Application publication date: 20190329 |