Product Introduction

        NDHZ-100A Transformer Comprehensive Parameter Tester is a new generation of innovative CT and PT testing instrument developed on the basis of traditional comprehensive testers for transformer volt-ampere characteristics, ratio, and polarity using voltage regulators, step-up transformers, and current boosters. It incorporates extensive user feedback, thorough market research, and in-depth theoretical studies. The device adopts high-performance DSP and FPGA, along with advanced manufacturing processes, ensuring stable and reliable performance, comprehensive functionality, high automation, and high testing efficiency. It represents a leading domestic level and is a professional testing instrument for transformers in the power industry.

Product Features

☆ Comprehensive functionality, meeting the testing requirements for various CTs (such as protection, metering, and TP types) including excitation characteristics (volt-ampere characteristics), ratio, polarity, secondary winding resistance, secondary load, ratio error, and phase angle error. It can also be used for testing excitation characteristics, ratio, polarity, secondary winding resistance, ratio error, etc., of various PT electromagnetic units.

☆ Field calibration of current transformers does not require standard current transformers, current boosters, load boxes, voltage regulation control boxes, or heavy-current cables. It uses extremely simple test wiring and operation to achieve current transformer calibration, greatly reducing work intensity and improving efficiency, facilitating on-site transformer calibration work.

☆ Accurate measurement of ratio error and phase angle error, with ratio error allowance ≤ ±0.1% and phase angle error allowance ≤ ±5 minutes. Capable of on-site testing for 0.2S class current transformers, with a ratio measurement range of 1 to 35,000.

☆ Based on advanced frequency conversion method to test CT/PT volt-ampere characteristic curves and 10% error curves. Output can reach up to 180V AC voltage and 12Arms (36A peak) AC current, yet it can handle CT tests with knee points as high as 60KV.

☆ Automatically provides knee point voltage/current, 10% (5%) error curve, accuracy limit factor (ALF), instrument security factor (FS), secondary time constant (Ts), remanence factor (Kr), saturated and unsaturated inductance, and other CT and PT parameters.

☆ Testing complies with various transformer standards such as GB1208 (IEC60044-1), GB16847 (IEC60044-6), and GB1207. It automatically selects the appropriate standard for testing based on the type and class of the transformer.

☆ Simple and convenient testing, with one-key completion of CT direct resistance, excitation, ratio, and polarity tests. Except for load testing, all other CT tests use the same wiring method.

☆ Full Chinese dynamic graphical interface, allowing completion of wiring and parameter settings without referring to the manual: dynamically displays parameter settings, automatically showing relevant parameters based on the currently selected test item; dynamically displays help wiring diagrams, showing the corresponding wiring diagram for the currently selected test item.

☆ 5.7-inch graphic transmissive LCD, clearly visible in sunlight.

☆ Uses a rotary optical mouse for operation, making it simple, fast, convenient, and easy to master.

☆ Built-in panel printer, automatically printing generated test reports.

☆ The device can store 1000 sets of test data, with no loss during power failure.

☆ Easy to carry, device weight <9Kg.

Technical Parameters

☆ Test purposes:
      CT: Excitation characteristics, ratio, polarity, secondary winding resistance, secondary load, current flow, ratio error, and phase angle error, etc.
      PT: Excitation characteristics, ratio, polarity, secondary winding resistance, and other testing requirements.
☆ Power supply: 185V ~ 250V, 45Hz ~ 65Hz
      Power: 800VA
☆ CT ratio accuracy: 1～2000 (0.5%), 2000～5000 (0.1%), 5000～35000 (0.2%)
      PT ratio accuracy: 1～2000 (0.5%), 2000～5000 (0.1%), 5000～35000 (0.2%)
      Phase measurement: 3min, resolution 0.01min
☆ Secondary winding range: 0Ω～300Ω
      Resolution: 1mΩ
      Accuracy: 0.1%+1mΩ
☆ Load range: 0VA～1000VA
      Resolution: 0.01VA
      Accuracy: 0.1%+0.01VA
☆ Environmental conditions:
      Operating temperature: -10℃～+50℃
      Storage temperature: -25℃～+70℃
      Relative humidity: 10%～95%, non-condensing
☆ Dimensions: 360mm × 285mm × 145mm
☆ Weight: 8kg (excluding accessories)