NDYF-103A Secondary Voltage Drop and Load Tester

Product Introduction

       The comprehensive error in electric energy metering consists of the combined error of the voltage transformer, the combined error of the current transformer, the error of the energy meter, and the metering error caused by the secondary voltage drop of the voltage transformer. Among these four errors, the metering error caused by the secondary voltage drop of the voltage transformer is often significant. Excessive comprehensive error in electric energy metering is a key issue commonly encountered in electric energy metering.

       The verification regulations for electric energy metering devices and relevant technical specifications stipulate that the error caused by the voltage drop in the secondary circuit of the voltage transformer must be accurately and quickly measured. The secondary voltage drop load tester produced is developed to meet these requirements.

Product Features

☆、Three-phase three-wire, three-phase four-wire, and single-phase fully automatic measurement;
☆、The instrument features automatic range switching to ensure testing accuracy;
☆、Utilizes electronic circuitry combined with DSP technology for excellent stability and strong anti-interference capability;
☆、After measurement, automatically calculates various parameters related to load, facilitating customer analysis and testing;
☆、Equipped with a large-screen Chinese character LCD display, all operations are prompted by Chinese menus; data has power-off storage and browsing functions, and can transmit data to a computer;
☆、Powered by a high-capacity 7.2V 11Ah lithium battery, it does not affect the test circuit and avoids system protection issues. It can also be used on-site without a power supply;
☆、For secondary load testing, uses clamp-type ammeters to sample current without disconnecting the secondary circuit, enabling online measurement without power interruption. Automatic range switching: during measurement, it can switch to different ranges based on the test object's value, ensuring measurement accuracy and display resolution;
☆、Comes with a lightweight charger for convenient measurement; can be used with an external charger when the battery is low;
☆、Compact size and lightweight design;
☆、Extremely wide secondary working current/voltage range. At a working current of 50mA, it can resolve 1mΩ resistance and reactance, and test the online actual load of S-class current transformers with a secondary rated current of 5A; at a working voltage of 5V, it can resolve 0.001mS conductance and susceptance;
☆、Can store 480 sets of measurement data, retaining data for up to ten years after power-off;
☆、Chinese interface with large-screen display, equipped with an RS-232 communication interface.

Technical Parameters

☆、Environmental Conditions
      Temperature: -10°C to 40°C
      Relative Humidity: <85% (25°C)
      Altitude: <2500m
      External Interference: No strong vibration or strong electromagnetic fields

☆、Main Technical Indicators for Secondary Voltage Drop Testing
      ⑴. Measurement Range: Ratio Error: 0.001% to 19.99%; Phase Error: 0.01’ to 599’
      ⑵. Resolution: Ratio Error: 0.001%; Phase Error: 0.01’
      ⑶. Instrument Basic Error
           ——DX=±(2%×X+2%×Y)±2 digits;
           ——DY=±( Y×2%+ X×2%×34.38)±2 digits.
           2 digits—Quantization error of the instrument
      ⑷. Voltmeter Accuracy: 0.5%
      ⑸. Operating Range: Voltage: (50 to 120)V
      ⑹. Instrument Indication Action Value (Error Prompt)
          ——Error: Ratio error greater than 20% or phase error greater than 600’.
          ——Voltage: Voltage <2.0V.

☆、Main Technical Indicators for PT Secondary Load Testing
      ⑴. PT Secondary Load Testing
           ——Admittance Measurement Range: 0.1ms to 50.0ms
           ——Secondary Voltage (50V to 120V)
          DX=±(2%×X+2%×Y)±2 digits
          DY=±(2%×X+2%×Y)±2 digits
          2 digits—Quantization error of the instrument

       Note: When the measured value is below 0.2mS, the test voltage should be maintained above 50V, and the clamp meter's core conductor should be kept centered. At this time, the instrument's quantization error is 5 digits.
       ⑵. Voltmeter: 0.5%

☆、Main Technical Indicators for CT Secondary Load Testing
       ——Impedance Measurement Range: 0.1Ω to 50.0Ω
       ——Impedance Measurement Accuracy:
       DX=±(2%×X+2%×Y)±2 digits
       DY=±(2%×X+2%×Y)±2 digits
       2 digits—Quantization error of the instrument
       Ammeter: 1%