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Resonant test system UHV-270kVA/108kV
for cablesfor transformersfor switchgear

Resonant test system - UHV-270kVA/108kV - Wuhan UHV Power Technology Co.,Ltd. - for cables / for transformers / for switchgear
Resonant test system - UHV-270kVA/108kV - Wuhan UHV Power Technology Co.,Ltd. - for cables / for transformers / for switchgear
Resonant test system - UHV-270kVA/108kV - Wuhan UHV Power Technology Co.,Ltd. - for cables / for transformers / for switchgear - image - 2
Resonant test system - UHV-270kVA/108kV - Wuhan UHV Power Technology Co.,Ltd. - for cables / for transformers / for switchgear - image - 3
Resonant test system - UHV-270kVA/108kV - Wuhan UHV Power Technology Co.,Ltd. - for cables / for transformers / for switchgear - image - 4
Resonant test system - UHV-270kVA/108kV - Wuhan UHV Power Technology Co.,Ltd. - for cables / for transformers / for switchgear - image - 5
Resonant test system - UHV-270kVA/108kV - Wuhan UHV Power Technology Co.,Ltd. - for cables / for transformers / for switchgear - image - 6
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Go to the Wuhan UHV Power Technology Co.,Ltd. website for more information

Characteristics

Test type
resonant
Applications
for cables, for transformers, for switchgear
Configuration
modular, portable, on site
Other characteristics
automatic, precision, high-voltage, high-power

Description

Introduction of resonant test system
  • The UHV-270kVA/10kV Series Resonance Solution is a frequency‑modulated series resonant AC test system designed for large-capacity high-voltage capacitive testing and preventive testing of cables, transformers and substation equipment. The series resonance system is based on a DSP platform, integrates multiple protection functions and is designed for easy field deployment.

Test range / typical applications of AC series resonance test system
  • 10kV/300mm² cable 3km AC voltage test, capacitance ≤1.1265μF, test frequency 30-300Hz, test voltage 22kV, test time 5min.
  • 10kV switch and other substation equipment AC withstand voltage test, the test frequency is 30-300Hz, the test voltage does not exceed 42kV, the test time is 1min.
  • 35kV/300mm² cable 1km AC voltage test, capacitance ≤0.1945μF, test frequency 30-300Hz, test voltage 52kV, test time 60min.
  • AC voltage withstand test of 35kV/31500kVA main transformer, capacitance ≤0.02μF, test frequency 45-65Hz, test voltage 68kV, test time 1min.
  • 35kV switch and other electrical equipment AC voltage test, the test frequency is 30-300Hz, the test voltage does not exceed 95kV, the test time is 1min.

Product Features
  • Integrated protection: adjustable overvoltage and overcurrent limits, zero-start, system mismatch/flashover detection with flashover voltage recording for analysis.
  • Lightweight, single-unit design for simplified transport and on-site use.
  • Three operating modes: automatic, manual and automatic tuning with manual boost to balance test speed and control.
  • Data storage and remote printing with indexed records for easy retrieval and reporting.
  • Automatic frequency sweep with configurable start point and selectable sweep direction; large LCD displays sweep curve to locate resonance point.
  • DSP platform enabling functional upgrades and an improved human–machine interface.
  • Reduced required supply capacity: series resonant excitation supplies mainly active power (approximately 1/Q of test capacity).
  • Compact size and lower weight by eliminating bulky high-power regulators and conventional test transformers (typical system size 1/10–1/30 of conventional devices).
  • Resonant filter improves output waveform quality, producing a near-sinusoidal voltage and reducing harmonic peaks applied to the test object.
  • Series-resonant behavior limits loop current on breakdown, reducing short-circuit burn risk and preventing recovery overvoltage after breakdown.

Technical specifications
  • Rated capacity: 270kVA
  • Rated voltage: 27kV; 54kV; 108kV
  • Rated current: 10A; 5A; 2.5A
  • Measurement accuracy: System RMS level 1.5
  • Operating frequency: 30–300 Hz
  • Device output waveform: Sinusoidal wave
  • Quality factor (Q): Device Q ≥ 30 (f = 45 Hz)
  • Output voltage waveform distortion: ≤ 1%
  • Input power supply: Single-phase 220 or three-phase 380V voltage, frequency 50Hz
  • Continuous operation: Allow continuous 60min under rated load; Overpressure 1.1 times 1 minute
  • Temperature rise: Temperature rise ≤65K after continuous operation under rated load for 60 minutes
  • Protection functions: Overvoltage, overcurrent, zero start, system mismatch (flashover) and other protection functions
  • Ambient temperature: −20 °C to 55 °C
  • Relative humidity: ≤ 90% RH
  • Altitude: ≤ 3000 m

What devices can our series resonance test system measure?
Covering all capacitive test samples in the power system, including:
  • Cross linked cables (medium voltage, high voltage, ultra-high voltage)
  • GIS and switchgear
  • Generator, electric motor
  • Transformer (inductive withstand voltage or partial discharge)
  • Casing, CT, PT, etc

VIDEO

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Resonant Test System

*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.
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