AC Voltage Test System

AC Voltage Test System

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AC Voltage Test System

Designed for the generation of 50/60 Hz alternating current (AC) high voltage (HV) with transformers or by resonant principle, available as indoor and outdoor design. PowerHV offers a wide range of AC Dielectric Test Systems power ratings from 30kV to over 2250 kVAC are available.

AC test systems with transformer

The AC test transformer are especially designed for testing high voltage products and components, such as cables, power transformers, gas-insulated switchgears, bushings and arresters. It is also suitable to test insulation materials. They are used to generate testing high voltage and function as part of the complete system. These systems are particularly suited for tests requiring stable voltage even if the load changes under voltage (corona, wet & pollution tests) or when the load is inductive (inductive voltage transformers) .

The AC test transformer can be either in insulation cylinder type with metallic cover and base or metal tank. The insulation cylinder modular test transformers can be stacked to connect in series or parallel to get larger voltage or current to extend its application range.

Insulating sheath transformers is installed in an insulating sheath and is oil-cooled. Individual transformers can be connected in parallel or series to increase the current or the voltage. The possibility of stacking several of these transformer modules allows reaching very high voltage levels by keeping reasonable floor space.

Model No. Structure Max voltage
YDTW Single unit upto 750kV
YDTCW Cascaded upto 2250kV

Metal tank transformers is situated in an enclosed and earthed metal tank. This transformer is oil-cooled and can be optionally equipped with a suitable bushing (oil-to-air or oil-to-SF6) .This design is allowing continuous operation and high currents (high power) which qualified for continuous duty, long duration tests.

Type Structure Max voltage
YDW Single unit upto 750kV
YDCW Cascaded upto 2250kV

AC test system with Gas-insulated transformer

The SF6 insulated test transformer is designed as a Gas-insulated model which convenient for testing GIS/ GIL components and switchgears. This makes testing of such installations possible without feeding them through an air-SF6 bushing.

Type Structure Max voltage Max capacity
YDQW Single unit upto 1200kV upto 4800kVA

Main components:

  • switchgear cabinet
  • Voltage regulator
  • Test transformer
  • Damping resistance
  • voltage divider
  • Control and Measuring System (manual operation or computer-aided automatic systems)

Additional features and accessories:

  • Power noise filter
  • Isolation transformer
  • Harmonic filters to improve wave shape
  • Coupling capacitor
  • fixed or tunable compensation of capacitive testing power
  • Fast over-voltage protection device
  • Partial discharge (PD) measuring system including blocking impedance
  • Compressed gas capacitor
  • Capacitance and dissipation factor measuring instrument
  • Moveable design
  • Made solution upon customer's request

AC test systems with Resonant Reactor ( Variable inductance )

Testing of certain apparatus requires much high voltage or current that a straight AC test system is not sufficient. Thus resonant test reactor with a variable core is needed. The main advantage of such test systems is lower input power and larger output power. The resonant test system is designed to compensate capacitance in the testing circuit precisely by tuning inductance of the test system. The natural resonance frequency of the test system matches feed-in mains, usually 50/60Hz. When the test system gets in resonance, it generates continuous testing high voltage.

AC resonant test system is used for factory testing of middle, high and ultra-high voltage cables, capacitors, generators, motors, power transformers and gas-insulated switchgears.

The resonant test systems can be either in insulation cylinder type or metal tank. Insulation cylinder reactors are in module and can be stacked to connect in series parallel to get much higher voltage or current. Additional voltage taps are possible for metal tank reactors. The output voltage is fed out through the tap-changers by HV bushings. This kind of reactors extend application range, and satisfy testing for cables of various voltage class.

Metal tank type HV Reactor is oil-cooled which is installed in a tank made of steel. The high voltage is fed outward through the steel tank via a HV bushing. The reactor can be fitted with additional voltage taps (bushings) to achieve largest testable capacitances of test objects at lower test voltages.

Model No. Structure Max voltage Max current
XZL Single unit upto 400kV 35A

Application

  • For routine testing of medium and high voltage cables up to 400 kV in accordance with IEC 60502 und IEC 60840
  • For routine testing of high voltage capacitors up to 60 kV in accordance with IEC 60871
  • For routine and inspection testing of generators and motors up to 60 kV in accordance with IEC 60034

Cylinder type HV Reactor is oil-cooled which is installed in a closed container made of steel and insulating cylinders. The module setup enables you to connect the reactors in series or in parallel for extending the range of voltage and/ or current. The individual modules can be installed above or next to one another

Model No. Structure Max voltage Max current
XZL Single unit upto 400kV 35A
XZL Cascaded upto 2000kV 35A

Application

  • For routine testing of high and ultra-high voltage cables up to 800 kV in accordance with IEC 60840 and IEC 62067
  • For inspection testing of high and ultra-high voltage cables and cable assemblies up to 1600 kV in accordance with IEC 60840 and IEC 62067
  • For applied voltage testing of power transformers up to 1600 kV in accordance with IEC 60076
  • For testing of gas-insulated switchgears up to 1600 kV in accordance with IEC 62271-203
  • For testing of voltage transformer including testing with higher frequencies and performing dynamic tests up to 1600 kV in accordance with IEC 60044

Main components:

  • HV reactor
  • HV power filter (also Capacitive Voltage Divider)
  • Exciter transformer
  • Voltage Regulator
  • Control and Measuring System (manual operation or computer-aided automatic systems)

Additional features and accessories:

  • Resonant circuits with variable frequency
  • low voltage power filter
  • Partial discharge (PD) measuring system including blocking impedance)
  • Compressed gas capacitor
  • Capacitance and dissipation factor measuring instrument
  • Moveable design
  • Made solution upon customer's request

Projects
3600kVA 1800KV AC Test Transformer for Xian High Voltage Apparatus Research Institute
1650kVA 1650kV AC Test Transformer for Jiangsu Electric Power Research Institute
1500 kVA 1500kV AC Test Transformer for Jiangxi Electric Power Research Institute
1500 kVA 1500kV AC Test Transformer for Shandong Electric Power Research Institute
3000kVA 1500kV AC Test Transformer for China Electric Power Research Institute
1500kVA 1500kV AC Test Transformer for Anhui Electric Power Research Institute
1500kV 2000kVA AC Test Transformer Discharge Test at 1180kV
500KVA-500KV AC Test Transformer for SIEMENS TRANSFORMERS Spa
9600kVA 1600kV AC Resonant Test System for Jiangsu Zhongxin Chuangyuan High Voltage Electric Co., Ltd
7200kVA 1200kV AC Resonant System for Tianwei Baobian (Qinhuangdao) Transformer Co., Ltd
7200kVA 1200KV AC Resonant Test System for National Center for Quality Supervision & Test of Electric Wire & Cable
14000kVA 700KV AC Resonant Test System (outdoor) for National Center for Quality Supervision & Test of Electric Wire & Cable
3000 kVA 1000kV AC Resonant Test System for Shanghai Zongfa E Power Ehv Equipment Co
1000kV 6000kVA AC Resonant Test System for Mitsubishi Electric (Shanghai)
800kV 3200KVA AC Resonant System for HELSINKI UNIVERSITY OF TECHNOLOGY DEPI OF ELECTRICAL ENGINEERING
350kV 1050kVA AC Resonant Test System for SIEMENS MANUFACTURING S
750kV 3A AC RESONANT REACTOR for KVTEK Power System (India)
350kV 350kVA AC RESONANT TEST SYSTEM for ARKASIL SK LLC
350kV 350kVA AC RESONANT TEST SYSTEM for ARKASIL SK LLC
350kV 35A AC Resonant Test System for Nantong Zhongtian Cable Co., Ltd
500kVA 500kV AC Resonant Test System for Wuhan High Voltage Research Institute
700kV 2800kVA AC Resonant Test System for Wuxi Hengchi Electric Co., Ltd
XZL-2000kVA 200kV AC Resonant Test System for National Center for Quality Supervision & Test of Electric Wire & Cable
350kV 20A AC Resonant Test System for Wuhan High Voltage Research Institute
Tank Type Reactor
Tank Type Reactor
350kV 8A AC AC Resonant Test Systemr (For Egypt) Discharge Test
250kV 25A AC Resonant Test System Discharge Test
2000kV 10A AC Resonant Test System