CN201955433U - Induction withstand voltage tester for pure-capacitive electromagnetic voltage transformer - Google Patents

Induction withstand voltage tester for pure-capacitive electromagnetic voltage transformer Download PDF

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Publication number
CN201955433U
CN201955433U CN2010206853081U CN201020685308U CN201955433U CN 201955433 U CN201955433 U CN 201955433U CN 2010206853081 U CN2010206853081 U CN 2010206853081U CN 201020685308 U CN201020685308 U CN 201020685308U CN 201955433 U CN201955433 U CN 201955433U
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CN
China
Prior art keywords
voltage
transformer
frequency power
compensation
output
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Expired - Fee Related
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CN2010206853081U
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Chinese (zh)
Inventor
余青
周洪
董巍
樊斌
周宇峰
朱文康
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Suzhou Huadian Electric Co Ltd
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Suzhou Huadian Electric Co Ltd
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Priority to CN2010206853081U priority Critical patent/CN201955433U/en
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Publication of CN201955433U publication Critical patent/CN201955433U/en
Anticipated expiration legal-status Critical
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Abstract

The utility model relates to an induction withstand voltage tester for a pure-capacitive electromagnetic voltage transformer. The induction withstand voltage tester comprises a variable frequency power supply, an isolation transformer and a compensating inductor, wherein mains electricity is connected to the variable frequency power supply, the variable frequency power supply rectifies the mains electricity into DC and outputs frequency adjustable AC ranging from 0 to 150V after inversion and a series voltage regulation control, the variable frequency power supply outputs variable frequency AC to the isolation transformer which adjusts a measuring range of output voltage, then the isolation transformer is connected to a secondary winding a2*1 of the electromagnetic voltage transformer, wherein secondary windings a1*1 and a2*2 are serially connected, a1 and *2 are short-circuited, the compensating inductor connected to the secondary winding a2*1 in parallel makes reactive compensation, secondary windings a3*3 and a4*4 are also serially connected with one another as well as connected to the compensation inductor in parallel to make compensation, voltmeters installed at two sides of the compensating inductor are used for detecting output voltage, and ampere meters installed at high voltage tail end outputted by the isolation transformer are used for detecting output current of the tester. The technical scheme adopted by the utility model is characterized by fixed inductance, small size, light weight, lowered loss, energy and resource conservation and realization of one device with multi-functions.

Description

A kind of pure Capacitive Electromagnetic Voltage Transformer induction Hi-pot Tester
Technical field
The utility model relates to a kind of electromagnetic type voltage transformer induced over voltage withstand test instrument, and particularly a kind of pure Capacitive Electromagnetic Voltage Transformer induction Hi-pot Tester belongs to the electrical Instrument technology field.
Background technology
The iron core of electromagnetic type voltage transformer induced over voltage withstand test instrument is approaching saturated when the power frequency rated voltage, again field voltage is raised to the magnitude of voltage of rated voltage more than 2 times, make core sataration, no-load current can sharply increase, reach unallowable degree, generally selecting test frequency is about 150Hz; Traditional frequency tripling frequency is to fix 3 points, the drawback of electromagnetic type voltage transformer induced over voltage withstand test instrument is: inductance value is not easy to be configured to optimum, thereby the power and the loss of instrument have been improved, the electromagnetic type voltage transformer induced over voltage withstand test instrument is capacitive, power is very big during test, what have will surpass more than the 200A, very big the getting up of could being with of power; According to doing some data that the electromagnetic potential transformer test obtains in the past:
The phase difference measurement of mutual inductor Secondary Winding side electric current and voltage is about-87 degree (each is all different), and compensating inductance loop voltage current phase difference measurements is 83 degree.Suppose that excitation curve is a linear relationship, mutual inductor Secondary Winding electric current is 92.56A when then applying normal trial voltage, through inquiry producer, can bear with interior winding at 100A, must strictly monitor this electric current in the test.Adding two groups of its electric currents of inductance compensation is 32.14A.Consider the influence of power factor, the active current IP1=2*92.56*COS87A of mutual inductor secondary side then, reactive current IQ1=2*92.56*SIN87A; And the active current IP2=2*32.14*COS83A of compensating reactance, reactive current IQ2=2*32.14*SIN83A.Then flow through to isolate and uprise the size of current of pressing winding:
I=9.68+7.84+J(184.86-63.8)=122.32A,
Conclusion: because reactance compensation causes inadequately isolating and becomes and frequency conversion source capacity can't be finished the induced over voltage withstand test of this voltage transformer (VT) inadequately.At this moment will increase compensating inductance and improve reactive-load compensation, estimation will be joined three groups of inductance again.Certainly be with the adjusted inductance,, regulate the inductance heaviness, be not easy to carry, and noise is very big for so big electric current.Compensation has error certainly, is not easy to mend best, can increase the output power of instrument like this.
The utility model content
The utility model purpose is to have proposed a kind of pure Capacitive Electromagnetic Voltage Transformer induction Hi-pot Tester in order to overcome the deficiencies in the prior art.
For achieving the above object, the technical solution adopted in the utility model is: a kind of pure Capacitive Electromagnetic Voltage Transformer induction Hi-pot Tester comprises variable-frequency power sources, isolates change, compensating inductance; Civil power is inserted variable-frequency power sources, variable-frequency power sources becomes direct current with the commercial power rectification, inversion then, through a series of voltage stabilizing control, be output as the interchange of 0-150V frequency adjustable, variable-frequency power sources output frequency-changing AC becomes to isolating, isolate the joint output voltage range that modifies tone, receive then on the Secondary Winding a2 x1 of electromagnetic potential transformer, the Secondary Winding a1x1 and the a2x2 of electromagnetic potential transformer are together in series, a1 and x2 short circuit, and the shunt compensation inductance is done reactive-load compensation on a2x1, a3x3 and a4x4 also are series connection, and inductance compensation, put voltage table in the both sides of compensating inductance, detect output voltage, isolating the high pressure tail end string reometer that becomes output, the output current of detecting instrument.
Because the utilization of technique scheme, the utility model compared with prior art has following advantage:
Pure Capacitive Electromagnetic Voltage Transformer induction Hi-pot Tester of the present utility model adopts system controlled by computer, and utilization digital waveform synthetic technology and modern power electronics technology manufacture and design, than traditional frequency tripling generator high efficiency, output voltage stabilization, measuring accuracy height, good reproducibility.And can test the test volt-ampere characteristic and the volt-ampere characteristic of directly drawing automatically.Pure Capacitive Electromagnetic Voltage Transformer induction Hi-pot Tester also has isolation, short circuit, overcurrent, overvoltage, defencive function such as overheated; Show and adopt the giant-screen backlight liquid crystal displays, complete Chinese operation and control interface, band real-time clock function, mini-printer; What this programme carried is fixed inductance, and volume is little, and is in light weight, inductance value is a plurality of specifications in addition, can be in parallel or series connection use, the reactive-load compensation electric current that allows of trying one's best increases, and reduces the meritorious output of pure Capacitive Electromagnetic Voltage Transformer induction Hi-pot Tester, compensation is less than best, at this moment can regulating frequency, allow it arrive parallel resonant point, allow pure Capacitive Electromagnetic Voltage Transformer induction Hi-pot Tester export with minimal power, reduce loss, energy-conservation resource; This programme is bigger than traditional electromagnetic type voltage transformer induced over voltage withstand test instrument power simultaneously, tester generally is 20KW, 30KW, function is many, because pure Capacitive Electromagnetic Voltage Transformer induction Hi-pot Tester can be exported the continuous adjustable frequency of 45Hz~200Hz, the alternating voltage of 0~500V, so, can also be used for other the test occasion that need use variable-frequency variable-voltage power supply use except being used for the induced over voltage withstand test of electromagnetic potential transformer (PT); This programme also provides the test of electromagnetic potential transformer open circuit loss, and volt-ampere characteristic test function or the like realizes a tractor serves several purposes.
Description of drawings
Below in conjunction with accompanying drawing technical solutions of the utility model are described further:
Fig. 1 is the fundamental diagram of pure Capacitive Electromagnetic Voltage Transformer induction Hi-pot Tester of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is described.
Be a kind of pure Capacitive Electromagnetic Voltage Transformer induction Hi-pot Tester described in the utility model as shown in Figure 1, comprise variable-frequency power sources, isolate change, compensating inductance; Civil power is inserted variable-frequency power sources, variable-frequency power sources becomes direct current with the commercial power rectification, inversion then, through a series of voltage stabilizing control, be output as the interchange of 0-150V frequency adjustable, variable-frequency power sources output frequency-changing AC becomes to isolating, isolate the joint output voltage range that modifies tone, receive then on the Secondary Winding a2x1 of electromagnetic potential transformer, the Secondary Winding a1x1 and the a2x2 of electromagnetic potential transformer are together in series, a1 and x2 short circuit, and the shunt compensation inductance is done reactive-load compensation on a2x1, a3x3 and a4x4 also are series connection, and inductance compensation, put voltage table in the both sides of compensating inductance, detect output voltage, isolating the high pressure tail end string reometer that becomes output, the output current of detecting instrument.
For pure Capacitive Electromagnetic Voltage Transformer induction Hi-pot Tester, its electric capacity is very big.Pure Capacitive Electromagnetic Voltage Transformer iron core is approaching saturated when the power frequency rated voltage, again field voltage is raised to the magnitude of voltage of rated voltage more than 2 times, its voltage transformer (VT) core sataration, no-load current can sharply increase, reach unallowable degree, generally selecting test frequency is about 150Hz.Similar in inductance value estimation configuration, carry out the adjusting of frequency then, find its tuning-points (it is maximum that reactive-load compensation reaches), allow instrument export with minimal power, reduce loss, energy-conservation resource.
Because the utilization of technique scheme, the utility model compared with prior art has following advantage:
Pure Capacitive Electromagnetic Voltage Transformer induction Hi-pot Tester of the present utility model adopts system controlled by computer, and utilization digital waveform synthetic technology and modern power electronics technology manufacture and design, than traditional frequency tripling generator high efficiency, output voltage stabilization, measuring accuracy height, good reproducibility.And can test the test volt-ampere characteristic and the volt-ampere characteristic of directly drawing automatically.Pure Capacitive Electromagnetic Voltage Transformer induction Hi-pot Tester also has isolation, short circuit, overcurrent, overvoltage, defencive function such as overheated.Show and adopt the giant-screen backlight liquid crystal displays, complete Chinese operation and control interface, band real-time clock function, mini-printer; What this programme carried is fixed inductance, and volume is little, and is in light weight, inductance value is a plurality of specifications in addition, can be in parallel or series connection use, the reactive-load compensation electric current that allows of trying one's best increases, and reduces the meritorious output of pure Capacitive Electromagnetic Voltage Transformer induction Hi-pot Tester, compensation is less than best, at this moment can regulating frequency, allow it arrive parallel resonant point, allow pure Capacitive Electromagnetic Voltage Transformer induction Hi-pot Tester export with minimal power, reduce loss, energy-conservation resource; This programme is bigger than traditional electromagnetic type voltage transformer induced over voltage withstand test instrument power simultaneously, tester generally is 20KW, 30KW, function is many, because pure Capacitive Electromagnetic Voltage Transformer induction Hi-pot Tester can be exported the continuous adjustable frequency of 45Hz~200Hz, the alternating voltage of 0~500V, so, can also be used for other the test occasion that need use variable-frequency variable-voltage power supply use except being used for the induced over voltage withstand test of electromagnetic potential transformer (PT); This programme also provides the test of electromagnetic potential transformer open circuit loss, and volt-ampere characteristic test function or the like realizes a tractor serves several purposes.
Below only be concrete exemplary applications of the present utility model, protection domain of the present utility model is not constituted any limitation.All employing equivalents or equivalence are replaced and the technical scheme of formation, or any to move mode dull and stereotyped described in the utility model, all drop within the utility model rights protection scope.

Claims (1)

1. a pure Capacitive Electromagnetic Voltage Transformer induction Hi-pot Tester is characterized in that: comprise variable-frequency power sources, isolate change, compensating inductance; Civil power is inserted variable-frequency power sources, variable-frequency power sources becomes direct current with the commercial power rectification, inversion then, through a series of voltage stabilizing control, be output as the interchange of 0-150V frequency adjustable, variable-frequency power sources output frequency-changing AC becomes to isolating, isolate the joint output voltage range that modifies tone, receive then on the Secondary Winding a2 x1 of electromagnetic potential transformer, the Secondary Winding a1x1 and the a2x2 of electromagnetic potential transformer are together in series, a1 and x2 short circuit, and the shunt compensation inductance is done reactive-load compensation on a2x1, a3x3 and a4x4 also are series connection, and inductance compensation, put voltage table in the both sides of compensating inductance, detect output voltage, isolating the high pressure tail end string reometer that becomes output, the output current of detecting instrument.
CN2010206853081U 2010-12-28 2010-12-28 Induction withstand voltage tester for pure-capacitive electromagnetic voltage transformer Expired - Fee Related CN201955433U (en)

Priority Applications (1)

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CN2010206853081U CN201955433U (en) 2010-12-28 2010-12-28 Induction withstand voltage tester for pure-capacitive electromagnetic voltage transformer

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Application Number Priority Date Filing Date Title
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102437746A (en) * 2011-11-22 2012-05-02 国网电力科学研究院 Grading compensation power supply device for field correction of ultra/extra high-voltage CVT (constant-voltage transformer)
CN102540022A (en) * 2010-12-28 2012-07-04 苏州华电电气股份有限公司 Pure capacitive electromagnetic type voltage transformer induction withstand voltage tester
CN105277859A (en) * 2015-11-12 2016-01-27 北京送变电公司 Electromagnetic voltage transformer induced withstand voltage test system and method
CN111337782A (en) * 2020-04-03 2020-06-26 苏州华电电气股份有限公司 Main transformer bias live monitoring system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102540022A (en) * 2010-12-28 2012-07-04 苏州华电电气股份有限公司 Pure capacitive electromagnetic type voltage transformer induction withstand voltage tester
CN102437746A (en) * 2011-11-22 2012-05-02 国网电力科学研究院 Grading compensation power supply device for field correction of ultra/extra high-voltage CVT (constant-voltage transformer)
CN102437746B (en) * 2011-11-22 2013-12-18 国网电力科学研究院 Grading compensation power supply device for field correction of ultra/extra high-voltage CVT (constant-voltage transformer)
CN105277859A (en) * 2015-11-12 2016-01-27 北京送变电公司 Electromagnetic voltage transformer induced withstand voltage test system and method
CN111337782A (en) * 2020-04-03 2020-06-26 苏州华电电气股份有限公司 Main transformer bias live monitoring system

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CF01 Termination of patent right due to non-payment of annual fee
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Granted publication date: 20110831

Termination date: 20191228