Product Introduction

       High-voltage energy metering devices in power plants and substations, as well as energy metering devices for a large number of users, are related to the interests of power generation, transmission, power supply, and users. To ensure accurate metering, inspections must be carried out in accordance with JJG1021-2007 "Electrical Transformers" and DL/T448-2000 "Technical Management Regulations for Electrical Energy Metering Devices".

       NDPT-H Voltage Transformer Field Calibrator is developed based on advanced testing technology, large-scale electronic circuit design, and compliance with national relevant regulations. This voltage transformer tester solves the problems of high workload and cumbersome operations in field calibration of voltage transformers, while offering reliable performance and powerful functionality.

Product Features

☆、Low-to-High Voltage Transformer Field Tester integrates both the low-to-high method for measuring voltage transformer errors and the potentiometric method for measuring voltage transformer errors, facilitating on-site calibration of metering devices.

☆、Field calibration of voltage transformers does not require standard voltage transformers, voltage boosters, load boxes, or voltage regulation control boxes. It uses extremely simple test wiring and operations to achieve calibration of electromagnetic voltage transformers, greatly reducing workload and improving efficiency, making it convenient for on-site transformer calibration.

☆、The low-to-high Voltage Transformer Field Tester has an internal standard voltage transformer with the same transformation ratio as the tested voltage transformer, with an accuracy of 0.05 class, accurately measuring the transformation ratio and no-load error of the tested voltage transformer. The transformer error is then calculated based on the impedance and admittance test results.

☆、Wide measurement range, up to 6kV/100V～220kV/100

☆、Features voltage transformer ratio, DC internal resistance, and voltage load box testing functions.

☆、Supports dual-winding voltage transformer testing with two load boxes.

☆、Equipped with a 640×480 high-resolution large-screen LCD display, user-friendly interface and operation design, and touchscreen-assisted operation for more convenient and faster use.

☆、Utilizes precise software algorithms to further improve measurement data accuracy.

☆、Intelligently judges external wiring conditions, alerts for wiring errors, ratio errors, polarity errors, etc.

☆、Automatically rounds test data and determines if it exceeds tolerance limits. Out-of-tolerance data is displayed in reverse black, providing an intuitive understanding of transformer data characteristics.

☆、Directly outputs on-site calibration conclusions: pass or fail.

☆、Large-scale memory can store up to 1000 field test data entries.

☆、Comes with a printer for on-site printing of test data.

☆、Uses an engineering plastic molded case for shock and pressure resistance, ensuring operator and equipment safety during high-voltage field tests.

Technical Parameters

☆、Low-to-High Voltage Transformer Error Measurement Section:
       Overall Accuracy: 1/3 of the error limit of the tested voltage transformer
       Test Range: 

       Operating Range of Tested Voltage Transformer: 80%～120%
       Secondary Load: 0.0VA～300VA, COSφ＝0.1～1.0
       Accuracy Range of Tested Voltage Transformer: 1.0, 0.5, 0.2, 0.1
       Resistance and Admittance Measurement Error ≤5.0% 
       Measurement Range: R: 0.00Ω～5.0Ω Y: 0.000mS～200.0mS
☆、Voltage Transformer Calibrator Section:
      Basic Error: In-phase Component: DX=±（X×2%+Y×2%±2 digits）
       DY=±（X×2%+Y×2%±5 digits） "X", "Y"——display values of the instrument "5 digits"——quantization error of the instrument
      Percentage Meter: Class 1
      Measurement Range: f: 0.0000%～200.0% δ: 0.000′～999.9′
      Rated Operating Voltage: 100/3V, 100/√3V, 100V
      Operating Range of Tested Voltage Transformer: 20%～200%