Payment & Shipping Terms:
|Test Principle:||Variable Frequency Resonant Circuit||Usage:||AC Hipot Test And Induced Withstand Voltage Test|
|Feature:||PD Free , No More Than 10pC||Application:||HV Power Transformer，GIS，Power Substation|
|Test Frequency:||150Hz～200Hz Or 20~300Hz||Duty Cycle:||90 Mints Or 180mints|
|Test Accuracy:||No Less Than 1.0%||Special For:||On-site ACLD Test ,On-site PD Analyzing|
|Test Standard:||IEC60076-3-2013;IEC 60060-1:2010；IEC 60840:2011 And IEC 62067:2011 For XLPE Cable|
high voltage resonant test system,
resonant test set
PD Free AC Resonant Test Systems , No Corona Induced Withstand Voltage Test Sets
I. Product Description:
Induced voltage withstand test(IVWT), also called induced overvoltage withstand test ,ACSD,ACLD, DVDF, is one of most important dielectric test of power transformers.As per IEC60076-3-2013, IVWT is necessary routine test and acceptance test ater installation for abobe 110KV Power transformer .
The FKWJF-300 Non Partial Discharge Variable Frequency Power Serial Connected ResonanceTest System is composed of non partial discharge variable frequency power, step-up transformer, compensation reactor and capacitive voltage divider. The transformer partial discharges, induced withstand voltage test system performs the test in the way of induction. It applied voltage to the LV side of the test object and produced the large excitation current via changing the frequency of the test circuit with the application of parallel resonance principle. The Serial Connected Resonance Test System is made up of variable frequency power source, excitation transformer, HV reactor and capacitive voltage divider. The capacitor and reactor of test object formed a serial resonance connection. The voltage divider is in serial connection with the test object and used for measuring the resonance voltage and acting as the overvoltage protection signal. The frequency modulation power
output is coupled to series resonance circuit via excitation transformer to provide the exciting power. This test system does not have a problem of large starting current. The power supply with small capacity is capable of fulfilling the test equivalent to 30 to 60 times of the power supply. This greatly solved the problem of poor capacity of test power at site.
FKWJF 300KW systems can provide single phase +35KV /150Hz~200Hz alternative current to test up to 630 MVA/220 kV power transformers insulation performance between turns of coils, layer to layer. i.e, minor insulation, including uniform and non-uniform insulation.
Together 2 or 4 channels PD analyzer and its accessories, Model FKWJF400KW also can be used for Induced voltage test with partial discharge measurement (IVPD). Together HV test reactor group, HV divider and its accessories, it also can perform AC applied withstand voltage test thorugh LC resonant circuit within 20~300Hz.
II. Main features
III. Test Guideline
Note : The above figure is connection circuit for induced withstand voltage test and PD detecting to power transformer
During the PD test and inductive voltage withstand test, the tested transformer is similar to a large capacitive test object. The capacitive reactive current of the transformer is compensated by the inductive current of the compensating reactor.The variable frequency power supply provides the whole system with active loss and small part of reactive loss. And both losses satisfy the no-load loss of electric transformer at test frequency.The voltage divider is installed at the HV output terminal of the excitation transformer. Measure the voltage at LV (low voltage) side of the main transformer by a peak voltmeter and calculate the voltage at the HV side according to voltage ratio of the main transformer.
The bushing capacitance of the main transformer is used as the coupling capacitor. Input partial discharge signal to the PD tester to measure the PD value.
Note: The above figure is connection circuit for AC applied withstand voltage with LC resonant principle.
IV. Main Components
|Item||Product Name||Type and specification||Quantity||Remarks|
|1||PD free variable frequency power supply||FKWJF-300kW||1 piece|
|2||PD free excitation transformer||CQSB(J)-300kVA||1 piece|
|3||PD free compensating reactor||CHX(kf)-600kVA/22kV||2 pieces||For Induced test|
|4||PD free capacitive voltage divider||TRF-50kV/300pF||1 set||For PD sampling|
|5||HV test reactor||CHX(kf)-500kVA/200kV||2 pieces||For resonance voltage withstand|
|6||HV capacitance voltage divider||TRF-400kV-2500pF||1 set||For resonance voltage sampling|
|7||Corona ring for PD test to main power transformer||220KV||3 pieces||For PD testing|
Note: the above table is just for example
V. General Technical data:
2. Technical specification
VII. Other typical model
1 Optional model for Induced withstand voltage test
|System Model||Output power||Max Application|
|FKWJF-150KW||150KW||66KV power transformer|
|FKWJF-200KW||200KW||110KV power transformer|
|FKWJF-300KW||300KW||220KV/630MW and below power transformer|
|FKWJF-400KW||400KW||220KV/above 630MW power transformer|
|Special requirement can be made by order|
Contact Person: Sales Manager