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Voltage calibrator UHV-740
resistanceelectrical parametersfor transformers

Voltage calibrator - UHV-740 - Wuhan UHV Power Technology Co.,Ltd. - resistance / electrical parameters / for transformers
Voltage calibrator - UHV-740 - Wuhan UHV Power Technology Co.,Ltd. - resistance / electrical parameters / for transformers
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Go to the Wuhan UHV Power Technology Co.,Ltd. website for more information

Characteristics

Physical quantity
voltage, resistance, electrical parameters
Applications
for transformers, for voltage transformer (VT)
Options
portable, documenting, with integrated data logger, computerized
Temperature

Max.: 40 °C
(104 °F)

Min.: 5 °C
(41 °F)

Humidity range

Max.: 80 %

Min.: 0 %

Voltage

Max.: 100 V

Min.: 0 V

Description

Product overview
  • The UHV-740 is an all-in-one GIS field calibrator for on-site error calibration of capacitive voltage transformers (CVT) and electromagnetic potential transformers (PT). It performs accurate ratio and phase error measurements using low-voltage tests and transformer load-curve extrapolation across multiple ratios (6–500 kV/√3).


Key Features & Benefits
  • All-in-one testing solution: Eliminates external boost sources and load boxes by extrapolating the voltage transformer load curve to measure PT/CVT errors (ratio and phase) at 20%–120% loads in compliance with national standards.
  • Comprehensive parameter measurement: Supports PT/CVT ratio & phase errors, CVT partial voltage ratio and capacitance, intermediate PT ratio/voltage, DC resistance, and polarity/ratio/wiring checks.
  • Efficiency & safety: One-click complete testing to reduce human error and risks; operation under <4 kV with multi-layer protection; fast frequency-conversion technology with anti-interference.
  • User-centric design: WINCE OS with dual-mode operation (touchscreen/mouse), intuitive wiring diagrams, and dual USB ports for immediate data export; 16 GB internal storage for millions of datasets.


Main tests and measured parameters
  • PT/CVT ratio and phase error measurement
  • CVT partial voltage ratio and partial capacitance measurement
  • Intermediate PT ratio and voltage measurement
  • DC resistance measurement
  • Polarity, ratio and wiring verification


Technical specifications
  • Operating environment: Temperature 5–40 °C; Relative humidity <80% (25 °C); Altitude <4500 m; Power frequency 50 ± 0.5 Hz.
  • Measured transformer types: GIS Electromagnetic (PT) and Capacitive Voltage Transformer (CVT).
  • Primary voltage range: 6–500 kV/√3 (non-standard primary voltages acceptable).
  • Supported secondary voltages: 100 V, 100 V/√3, 110 V, 110 V/√3, 100/3 V.
  • Error measurement accuracy (ratio/phase): 0.05%.
  • Partial pressure ratio measurement accuracy: 0.5%.
  • Partial voltage capacitance measurement accuracy: 2%.
  • DC resistance accuracy: 0–0.1 Ω → 3%; 0.1–50 Ω → 1%.
  • Internal standard transformer ratio range: includes 6 kV/100 V (and 6 kV/√3 /100 V/√3), 10 kV/100 V (and 10 kV/√3 /100 V/√3), 35 kV/100 V (and 35 kV/√3 /100 V/√3), 110 kV/100 V (and 110 kV/√3 /100 V/√3), 220 kV/100 V (and 220 kV/√3 /100 V/√3), 330 kV/100 V, 500 kV/√3 /100 V/√3.
  • Internal standard accuracy class: 0.02%.
  • Verification section: Voltage range 0–100 V (dial indicator error 0.5%); ratio error 0.001%–3% (100 V); angular difference 0.00′–50′ (100 V); error expressions △X = ±(2%×X + 2%×Y ± 2 words); △Y = ±(2%×X + 2%×Y ± 2 words).
  • Admittance range: 0.1 ms–99.9 ms.
  • Storage and connectivity: 16 GB internal storage; dual USB ports for data export.
  • Dimensions (mm): 496 × 394 × 185.
  • Weight: 14.0 kg.

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