Product Introduction
We are a professional manufacturer and supplier of high-voltage power testing equipment in China.UHV-740 Capacitive Voltage Transformer Field Calibration Instrument GIS Field Calibrator simplifies on-site error calibration for electromagnetic (PT) and capacitive voltage transformers (CVT), overcoming traditional challenges of complex wiring, bulky equipment, and high-voltage requirements. This all-in-one solution performs accurate low-voltage measurements across multiple ratios (6kV-220kV/100V), integrating innovative technologies like variable-frequency power supply, common platform design, and simulated voltage loads.
 |  |  |
Key Features & Benefits
1、All-in-One Testing Solution
Eliminates need for boost sources/load boxes by using voltage transformer load curve extrapolation to measure PT/CVT errors (ratio/phase) at 20%-120% loads, fully compliant with national standards.
Comprehensive Parameter Measurement
2、Single device tests:
PT/CVT ratio & phase errors
CVT partial voltage ratio/capacitance
Intermediate PT ratio/voltage
DC resistance
Polarity/ratio/wiring checks
3、Efficiency & Safety
One-click complete testing reduces errors/risks
<4kV operation with multi-layer protection
16GB storage (millions of datasets)
Fast frequency-conversion tech with anti-interference
4、User-Centric Design
WINCE OS with dual-mode operation (touchscreen/mouse)
Intuitive wiring diagrams for foolproof connections
Dual USB ports for instant data export
Ürün parametreleri
teknik parametreler
| Environmental condition | Sıcaklık | （5~40）℃ |
| Bağıl nem | <80%（25℃） | |
| Sea level | <4500m | |
| Güç frekansı | 50±0.5Hz | |
| Type of the voltage transformer to be measured | GIS Electromagnetic (PT), Capacitive Voltage Transformer (CVT) | |
| Primary voltage | 6-500kV/√3(Non-standard primary voltage is also acceptable) | |
| Secondary voltage | 100V,100V/√3,110V,110V/√3,100/3V | |
| Accuracy of error measurement | 0.05% | |
| Partial pressure ratio measurement accuracy | 0.5% | |
| Measuring accuracy of partial voltage capacitance | 2% | |
| DC resistance measurement accuracy | 0-0.1Ω | 3% |
| 0.1-50 | 1% | |
| Internal standard voltage transformer section | Ratio range | 6kV/100V、6kV/√3 /100V/√3 |
| 10kV/100V、10kV/√3 /100V/√3 | ||
| 35kV/100V、35kV/√3 /100V/√3 | ||
| 110kV/100V、110kV/√3 /100V/√3 | ||
| 220kV/100V、220kV/√3 /100V/√3 | ||
| 330kV/100V、500kV/√3 /100V/√3 | ||
| Accuracy class | 0.02% | |
| Verification part of the calibrator | Voltaj aralığı | 0-100V (dial indicator error 0.5%) |
| Ratio error | 0.001%-3% （100V） | |
| Angular difference | 0.00′-50′（100V） | |
| Hata | △X=±(2%×X+2%×Y±2 words) | |
| △Y=±(2%×X+2%×Y±2 words) | ||
| Admittance | 0.1ms-99.9ms | |
| Hata | △X=±(2%×X+2%×Y±2 words) | |
| △Y=±(2%×X+2%×Y±2 words) | ||
| Overall dimensions (mm) | 496*394*185 | |
| Weight (kg) | 14.0 | |
Application Scenarios
Substation on-site testing — Before commissioning of newly built or expanded substations, perform ratio, phase error, polarity, and wiring verification on PT/CVT.
Substation operation and maintenance — Regular preventive testing, equipment condition inspection, and fault diagnosis to determine whether the PT/CVT has any abnormal parameters.
GIS equipment testing — On-site verification and parameter testing of electromagnetic PTs and CVTs within GIS.
Power metering / calibration — Checks the ratio and phase error of metering-grade PTs/CVTs, suitable for metering inspection, calibration, and related work.
Power equipment manufacturing and engineering commissioning — Factory testing by PT/CVT/GIS manufacturers; on-site acceptance testing by EPC contractors, electrical installation companies, and third-party testing organizations.
Frequently Asked Questions
Q:What types of voltage transformers can the UHV-740 test?
A:The UHV-740 is designed for testing electromagnetic voltage transformers (PTs) and capacitive voltage transformers (CVTs), including voltage transformers installed in GIS systems.
Q:Can the UHV-740 test both PT and CVT?
A:Yes. The UHV-740 supports comprehensive testing of both PTs and CVTs, including ratio error, phase error and other relevant parameters.
Q:Can the UHV-740 be used for GIS applications?
A:Yes. The UHV-740 is suitable for on-site testing of electromagnetic PTs and CVTs in GIS equipment.
Q:What are the main advantages of the UHV-740?
A:Its main advantages include integrated PT/CVT testing functions, portable field operation, reduced dependence on conventional test equipment, multiple measurement functions and simplified on-site testing.
