Overview
The WJRZ-II transformer winding deformation tester uses the internal fault frequency response analysis (FRA) method, which is currently being developed and improved in developed countries around the world, to accurately diagnose internal faults in transformers based on the measurement of characteristic parameters of the transformer winding.

Technical features:
The acquisition control adopts high-speed and highly integrated microprocessors.
This instrument can be connected to a laptop through a USB interface, and communication between the laptop and the instrument can be done using a wireless Bluetooth interface or a wireless WIFI interface. The wireless WIFI interface can also be conveniently used on tablets and smartphones.
The instrument automatically analyzes and judges the detection results, and generates electronic documents (Word) for saving and printing.
This instrument meets the technical requirements of both the power standards DL/T911-2016 "Frequency Response Analysis Method for Power Transformer Winding Deformation" and DL/T1093-2008 "Guidelines for Detection and Judgment of Power Transformer Winding Deformation by Reactive Method",
High speed dual channel 16 bit A/D sampling (on-site test changes the tap changer, and the waveform curve shows obvious changes).
The frequency response method hardware movement adopts DDS dedicated digital high-speed scanning technology (USA), which can accurately diagnose faults such as winding distortion, bulging, displacement, tilting, inter turn short circuit deformation, and inter phase contact short circuit through testing.
The frequency response method has dual measurement system functions of linear sweep frequency measurement and segmented sweep frequency measurement, and is compatible with the measurement modes of the two current domestic technology schools.
The amplitude frequency characteristics of the frequency response method comply with the technical specifications of the national amplitude frequency characteristic tester. The horizontal axis (frequency) has two types of divisions: linear division and logarithmic division, so the printed curve can be a linear division curve or a logarithmic division curve, and users can choose according to their actual needs.
The impedance method adopts a three-phase connection single-phase measurement method, which only requires short circuiting on the low voltage side and connecting all three phases at once on the high voltage side. The short-circuit impedance of each phase can be calculated automatically in one measurement.
Impedance method can synchronously measure voltage, current, and frequency, and display real-time waveform diagrams for testing
The impedance method can use an internal 220V power supply or an external power supply.

Technical Parameter
I frequency response method
Scanning method
Linear scanning distribution
Sweep frequency measurement range: (10Hz) - (10MHz) 40000 sweep frequency points, with resolutions of 0.25kHz, 0.5kHz, and 1kHz.
Segmented sweep frequency measurement distribution
Sweep frequency measurement range: (0.5kHz) - (1MHz), 2000 sweep frequency points;
(0.5kHz)-(10kHz)
(10kHz)-(100kHz)
(100kHz)-(500kHz)
(500kHz)-(1000kHz)

Other technical parameters
Range of amplitude measurement: (-120dB) to (+20dB)
Amplitude measurement accuracy: ≤ 1dB
Scanning frequency accuracy: ≤ 0.01%
Signal input impedance: 1M Ω
Signal output impedance: 50 Ω
Signal output amplitude: ± 20V
Same phase test repetition rate: 99.9%

II Impedance Method:
Measurement accuracy: Voltage: 0.2% Current: 0.2%
Impedance range: 0-100%
Voltage measurement range: AC 25V~500V
Current measurement range: AC 0.1A~10A
Working humidity: 0-80%
Same phase test repetition rate: 99.9%