Product Introduction
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.
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Product functions
1. PT/CVT ratio and phase error testing
Accurately measures the ratio error and phase error of voltage transformers, quickly determining the metering and measurement accuracy of PTs/CVTs.
2. CVT voltage division ratio and capacitance testing
Measures CVT voltage division ratio and capacitance parameters, effectively evaluating the performance and operating condition of the capacitive voltage divider.
3. DC resistance testing
Tests the DC resistance of transformer windings, assisting in determining whether there are abnormalities in windings, wiring, or circuits.
4. Polarity and wiring inspection
Quickly checks PT/CVT polarity and wiring conditions, promptly identifying wiring errors and improving the safety and reliability of on-site testing.
5. On-site automated comprehensive verification
Integrates multiple testing functions, supports automated testing and data storage, simplifies on-site wiring and operation procedures, and improves testing efficiency.
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
פרמטרים של מוצר
פרמטרים טכניים
| Environmental condition | טֶמפֶּרָטוּרָה | （5~40）℃ |
| לחות יחסית | <80%（25℃） | |
| Sea level | <4500m | |
| תדירות כוח | 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 | טווח מתח | 0-100V (dial indicator error 0.5%) |
| Ratio error | 0.001%-3% （100V） | |
| Angular difference | 0.00′-50′（100V） | |
| שְׁגִיאָה | △X=±(2%×X+2%×Y±2 words) | |
| △Y=±(2%×X+2%×Y±2 words) | ||
| Admittance | 0.1ms-99.9ms | |
| שְׁגִיאָה | △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
A:What is a PT/CVT tester?
A:A PT/CVT tester is specialized test equipment used to evaluate the performance and accuracy of potential transformers (PT) and capacitive voltage transformers (CVT). It can measure key parameters such as ratio error, phase error, polarity and other electrical characteristics. The UHV-740 combines multiple PT and CVT testing functions in one portable instrument for efficient field calibration.
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.
Q:What is the difference between a PT tester and a CVT tester?
A:A PT tester is primarily used for testing electromagnetic potential transformers (PT), while a CVT tester is designed for capacitive voltage transformers (CVT). CVT testing may also require measurement of the capacitive divider ratio and capacitance. The UHV-740 integrates both PT and CVT testing functions, providing an all-in-one solution for voltage transformer field testing.
As a professional PT/CVT Field Calibration Instrument manufacturer and supplier, we provide high-quality voltage transformer testing equipment for power utilities, electrical testing companies, and industrial customers worldwide. Our PT/CVT calibration instruments are designed for accurate ratio error, phase error, CVT divider ratio, capacitance, polarity, wiring and DC resistance testing. We offer competitive PT/CVT calibration instrument price, reliable product quality, professional technical support, and customized solutions to meet different field testing requirements.We also provide a one-year warranty service.
