ts3_lt8_highvolt_on-site testing of transformers
TRANSCRIPT
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HIGHVOLT Prüftechnik Dresden GmbH
Dr. Mario Jochim
SAVE COSTS AND TIME ASSURE QUALITY
On-site testing of transformers
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Dr. Mario Jochim, HIGHVOLT PRÜFTECHNIK Dresden GmbH 222
Agenda
§ Motivation
1
1.1
1.2
§ Areas of Application 2
2.1
2.2
2.3
§ Modules of the High Voltage test system
3
§ Induced voltage test
3.1
§ Applied voltage test
3.2
§ Summary
4
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Motivation
Ø Mobile test systems are an essential part of quality assurance during manufacturing, repair and diagnostics on-site
Dr. Mario Jochim, HIGHVOLT PRÜFTECHNIK Dresden GmbH 3
§ Saving time and costs by repairing of transformers on-site
§ Essential assembly for large power transformers takes place on-site (Logistical limitations)
§ Diagnostics are being improved
§ Flexible test system use on-site and in the factory
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Area of application: On-site repair of transformers
Ø Mobile on-site test systems are necessary to guarantee quality assurance equal to factory testing
Dr. Mario Jochim, HIGHVOLT PRÜFTECHNIK Dresden GmbH 4
§ Transport of faulty transformer to factory is costly and risky
§ Infrastructure limitations (narrow roads, live load of bridges, etc.) do not allow transportation of transformer
§ Prolonged down time/repair time of transformer due to return transportation
§ On-site repair is an attractive alternative (both cost and time-wise) to factory repair
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Area of application : Essential assembly for large power transformers on-site § Infrastructure limitations (narrow roads, live load of bridges, etc.) do not allow
transportation of transformer in whole
§ Large transformers are shipped in parts
§ Final assembly has to be performed on-site
Dr. Mario Jochim, HIGHVOLT PRÜFTECHNIK Dresden GmbH 5
Ø Mobile on-site test systems are necessary to guarantee quality assurance equal to factory testing
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Area of application : Diagnostics are being improved by HV tests § Improved determination and elimination of interferences due to change of
test frequency
§ Improved failure recognition due to evaluation of partial discharge (PD) inception and extinction voltage by change of the test voltage
§ On-site test results comparable to factory tests
Ø Mobile on-site test systems improve diagnostic value
Dr. Mario Jochim, HIGHVOLT PRÜFTECHNIK Dresden GmbH 6
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Area of application : Flexible test system use: on-site and in the factory § Some repair will be performed on-site and some in the factory
§ Mobile test systems increase redundancy, capability and quality comparability and therefore ensure better performance
§ Test results on-site and in the factory needs to be according to the relevant standards
§ Back-up for maintenance, repair and outage of MG-sets
Ø Mobile test systems can be used flexibly on-site and in the factory and save investment cost
Dr. Mario Jochim, HIGHVOLT PRÜFTECHNIK Dresden GmbH 7
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Modules of mobile test systems require:
§ Fulfillment of corresponding standards like IEC 60076-3, IEEE C57, GOST 1516.3
§ Compact design for easy transportation worldwide
§ Fast installation and testing
§ Multiple use for fast return on investment
à In short: mobile test systems have comparable functions to stationary test systems but are more compact, robust, assembly friendly, quality focused and multi functional
Ø On-site test results needs to be comparable to results from the factory, R & D
Dr. Mario Jochim, HIGHVOLT PRÜFTECHNIK Dresden GmbH 8
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9 Dr. Mario Jochim, HIGHVOLT PRÜFTECHNIK Dresden GmbH
Induced voltage test system on a 40 ft trailer Power: 620 kW, 1.000 kVA for power transformers up to 500 MVA
Space for accessories
Static frequency converter
Step-up transformer
Control room HV filter 1
Power supply cable, HV connection cable
CT’s and VT’s
Space for accessories, HV electrodes, etc.
HV test lead
Ø Compact on-site transformer test system Ø Ready to operate within 1 hour
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§ Compact and on-site proven design on: 1 x 40 ft trailer 3 x 20 ft containers
§ Units world wide in service
10 Dr. Mario Jochim, HIGHVOLT PRÜFTECHNIK Dresden GmbH
Induced voltage test system in 3 x 20ft containers Power: 620 kW, 1.000 kVA for power transformers up to 500 MVA
Table: Parameters of the test system
Ø The test system provides results directly comparable to factory test, conformity to corresponding standards
Test System Type WV 620-1200/80
Active power 620 kW
Apparent power 1,000 kVA
Max. output voltage 80 kV
PD level < 50 pC
THD < 5 %
Frequency range 40…200 Hz
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11 Dr. Mario Jochim, HIGHVOLT PRÜFTECHNIK Dresden GmbH
TRANSFORMERS TO BE TESTED UP TO APPROX.
Capability of test system for induced voltage test
Test WV 620-1000/80
No-load losses test
350 MVA (500 MVA with THD > 5 %)
Load losses/ short-circuit test 30 MVA
Induced voltage test 500 MVA
Applied voltage tests 46 kV
Ø Essential induced voltage tests can be performed on a large scale on power transformers
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Mobile compensation unit (HVCC 24000/36) § Current transformer for high accuracy load
loss measurement § Advanced protection system § Motorized cable drums for easy set-up
(preparation time approx. 1 hour)
12 Dr. Mario Jochim, HIGHVOLT PRÜFTECHNIK Dresden GmbH
Mobile extension for load losses test – HVCC 24000/36
Table: Parameter of HVCC 24000/36
Output terminals
Motorized cable drums
Ø Mobile capacitor bank allows to perform short circuit, load loss and temperature rise test
Extension for load loss testApparent power 24,000 kVAMay. Output voltage 36 kV
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13 Dr. Mario Jochim, HIGHVOLT PRÜFTECHNIK Dresden GmbH
THREE POSSIBILITIES OF EXTENSION
How to test bigger transformers?
1 Transformer test system WV 2 HV Capacitor bank HVCC 3 HV Compensation reactor 4 HV Transformer for applied voltage test 5 Transformer to be tested 2nd Transformer test system
Capacitor bank HVCC
Reactor
Ø Even for very large power transformers on-site tests can be arranged
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§ Parallel connection of up to 3 units possible
§ Suitable for high active power requirements of the test object
§ Available test power of 1.9 MW/3 MVA (3 systems in parallel)
14 Dr. Mario Jochim, HIGHVOLT PRÜFTECHNIK Dresden GmbH
2nd MOBILE TRANSFORMER TEST SYSTEM
Extension for no-load losses test
Test WV 620-1000/80 with Extension (2nd system in parallel)
No-load losses test 350 MVA (500 MVA with THD > 5 %)
700 MVA (1.000 MVA with THD > 5 %)
Table: Transformers to be tested
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15 Dr. Mario Jochim, HIGHVOLT PRÜFTECHNIK Dresden GmbH
TRANSFORMERS TO BE TESTED (UP TO APPROX.)
Mobile extension for load losses test – HVCC 24000/36
Test WV 620-1000/80 with Extension (mobile HVCC 24000/36)
Load losses/short-circuit test 30 MVA 150 MVA
+
Ø Mobile capacitor bank allows to perform short circuit, load loss and temperature rise test
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16 Dr. Mario Jochim, HIGHVOLT PRÜFTECHNIK Dresden GmbH
TRANSFORMERS TO BE TESTED (UP TO APPROX.)
Inductive compensation
Test WV 620-1000/80 with Extension (inductive compensation)
Induced voltage test 500 MVA 1000 MVA
+ Compensation reactor
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17 Dr. Mario Jochim, HIGHVOLT PRÜFTECHNIK Dresden GmbH
Applied voltage test system
RESONANT SYSTEM WITH VARIABLE FREQUENCY
Wide load range of power transformers 1.3 to 21.5 nF § Variable test frequency 40 to 200 Hz § Test voltage up to 720 kV § Set-up time approx. 1 hour
Ø Test system can also be used for test of GIS and short cables
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18 Dr. Mario Jochim, HIGHVOLT PRÜFTECHNIK Dresden GmbH
TRANSFORMERS TO BE TESTED (UP TO APPROX.)
Conclusion
Test WV 620-1000/80 With Extension / second test system
No-load losses test 350 MVA (500 MVA with THD > 5 %)
700 MVA (1.000 MVA with THD > 5 %) (2nd system in parallel)
Load losses/ short-circuit test 30 MVA
150 MVA (mobile HVCC 24000/36)
Induced voltage test 500 MVA 1000 MVA (compensation reactor)
Applied voltage tests 46 kV 300 kV (applied voltage extension) 720kV (WRV system)
Ø Modular structure test system allows cost effective testing even of large power transformers
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Summary
§ On-site high voltage tests on transformers are getting more important in the future due to on-site repair, diagnostics, installations and quality conformation
§ Test systems can be used for transformers but for GIS and cables too
§ Due to conformity with standards HV test systems can be used in the factory too
§ Double use in factory and on-site helps to save investment costs
Dr. Mario Jochim, HIGHVOLT PRÜFTECHNIK Dresden GmbH 19
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HIGHVOLT Prüftechnik Dresden GmbH HIGHVOLT Prüftechnik Dresden GmbH
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