Resonant test system UHV

for the electronics industryfor cablesmodular

Product Overview
This AC resonant withstand-voltage test system (UHV Series) is designed for on-site and laboratory testing of high-voltage equipment such as XLPE cables, main transformers, busbars, GIS and hydro-generator systems. The system integrates a frequency-conversion power supply, excitation transformer, high-voltage reactor and capacitor divider to perform variable-frequency AC dielectric tests and resonance search for installation, maintenance and acceptance procedures in utilities and test laboratories.

Application of AC Resonant Withstand Voltage Test System

• Type testing and commissioning of XLPE cables, power transformers, GIS, busbars and rotating machines.
• Periodic maintenance, site acceptance tests and high-voltage diagnostic applications for utilities and engineering contractors.

Work environment

• Ambient temperature: −10°C to 50°C
• Relative humidity: ≤90% RH
• Altitude: ≤1000 m

Main technical parameters and functions of resonant test system

• Rated system capacity: 324 kVA
• Input power: Three-phase 380 V, 50 Hz
• Rated output voltage: 54 kV
• Rated current: 6 A
• Working frequency range: 30–300 Hz
• Output waveform: sine wave; waveform distortion ≤1%
• Continuous operation: 60 min at rated load (1 min at 1.1× overvoltage allowed)
• Temperature rise: ≤65 K after 60 min at rated load
• System quality factor: Q ≥ 30 (at 45 Hz)
• Protection functions: configurable overcurrent, overvoltage and flashover protection
• Measurement accuracy: system effective value 1.5

Exciter transformer

• Rated capacity: 9 kVA
• Input voltage: 0–400 V (single-phase)
• Output voltage: 3 kV
• Structure: dry type
• Weight: approx. 50 kg

Variable frequency power supply

• Rated output capacity: 18 kW
• Supply voltage: 380 ±10% V (three-phase)
• Output voltage: 0–400 V (single-phase)
• Rated input/output current: 45 A
• Voltage resolution: 0.01 kV; voltage measurement accuracy: 1.5%
• Frequency range: 30–300 Hz; regulation resolution: ≤0.1 Hz; stability: 0.1%
• Continuous running: 60 min at rated capacity; noise ≤50 dB

High voltage reactor

• Rated capacity: 54 kVA
• Rated voltage: 27 kV
• Rated current: 2 A
• Inductance: 68 H / section
• Quality factor: Q ≥ 30 (at 45 Hz)
• Structure: dry type; weight: approx. 75 kg

Capacitor divider

• Rated voltage: 60 kV
• Capacitance: 2500 pF
• Dielectric loss: tgσ ≤ 0.5%
• Voltage division ratio: 1000:1
• Measurement accuracy: effective value 1.5; weight: approx. 10 kg

Product Features of AC Resonant Test System

• Comprehensive protection system with configurable thresholds and intelligent flashover detection for safe testing.
• Portable field design: modular, lightweight components for on-site deployment.
• Flexible testing modes: full-auto, manual, auto-tuning and manual boost for resonance search and dielectric tests.
• Smart data management: offline storage/printing with unique IDs for traceability.
• Intelligent frequency sweep with real-time LCD curve for visual resonance point identification.
• Upgradable DSP platform for modular function expansion and interface upgrades.

Technical specifications

• Series name: UHV Series Resonant System
• Rated system capacity: 324 kVA
• Rated output voltage: 54 kV
• Rated current: 6 A
• Frequency range: 30–300 Hz
• Output waveform distortion: ≤1%
• System Q factor: ≥30 (45 Hz)
• Protections: overcurrent, overvoltage, flashover
• Key modules: excitation transformer, variable frequency power supply, high-voltage reactor, capacitor divider

The Advantages of Resonant Test System

• 1. Low power capacity requirement: Due to the resonant state of the test circuit, the power supply only needs to provide the active consumption part of the system, and the power required for the test is only 1/Q of the test capacity, greatly reducing the power capacity requirement.
• 2. Lightweight equipment: eliminates the need for bulky high-power voltage regulating devices and ordinary high-power power frequency test transformers, greatly reducing system weight and volume, making it easy to carry and use on site.
• 3. Good output voltage waveform: The resonant power supply is a resonant filtering circuit that can improve the waveform distortion of the output voltage, obtain a good sine wave, and effectively prevent false breakdown of the test sample caused by harmonic peaks.
• 4. High safety: Modern frequency conversion series resonance test devices are usually equipped with various protective measures, such as overvoltage and overcurrent protection, to ensure safety and reliability during high-voltage testing.
• 5. Strong flexibility: The miniaturized design enables the resonant test system to be flexibly applied in different testing environments, suitable for various voltage levels and types of equipment.