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Huazheng HZ-3340D Transformer DC Resistance Test Instrument

The instrument can simultaneously measure the three-phase winding DC resistances of a transformer. For on-load tap-changing transformers, there is no need for discharging, and the tapping can be adjusted directly using the instrument. The measurement time is reduced to one-third of the time required by traditional single-phase methods, greatly shortening the overall testing time. The entire instrument is controlled by a microcontroller (SCM), which automatically performs functions such as self-checking, data processing, and display. Additionally, the instrument features automatic discharging and an audible discharge alarm. With advantages such as stable test data, high accuracy, fast operation, and excellent repeatability, this instrument is the ideal choice for on-site measurement of transformer DC resistance.

    Transformer Ttr Meter (1)

    I.Performance Features

    1.Fixed current output (20mA-40A across 9 ranges) and automatic current output (0.1-40A), where the optimal current is automatically selected based on the resistance of the test product.

    2.Wide measurement range (0Ω - 20KΩ), capable of measuring the inductive DC resistance of transformers, mutual inductors, and other devices.

    3.Multiple measurement functions:

    Single-channel measurement
    YN three-phase simultaneous measurement
    YN three-phase compensation simultaneous measurement (including O-phase resistance)
    Automatic YND11 transformer magnetic measurement
    YN three-phase selection measurement
    D/Y three-phase selection measurement
    Additionally, the instrument can automatically calculate the three-phase resistance balance rate.

    4.Data stabilization judgment function: Automatically calculates the percentage deviation of resistance over 5'', 15'', or 30'' to accurately assess the stability of the data and prevent misreading.

    5.Temperature conversion based on test product materials (copper, aluminum) for easy comparison with historical data.

    6.Transformer demagnetizing function: Effectively reduces transformer remanence.

    7.Additional features:

    Perpetual calendar
    Storage for 99 sets of test data
    Selection of Chinese and English interface
    No data loss after shutdown
    Built-in micro-printer and "U-disk" interfaces for data export

    8.6" color touch LCD display for clear data visualization.

    9.Dual RS485 communication interfaces for inter-device cascading. In cooperation with the control software on a host computer, the instrument supports remote control and measurement. Optional built-in Bluetooth module for wireless communication.

    10.Audible discharging alarm with clear discharge indication to reduce the risk of misoperation.

    11.Protection against incorrect AC380V power connection: When activated, an audible alarm alerts the user to prevent damage from misconnection. The instrument also includes robust counter-EMF protection and strong resistance to arc discharge.

    12.Durability and reliability: Features include dust, shock, and moisture protection, along with high measurement accuracy, excellent stability, good repeatability, and high portability.

    II.Specifications

    1.Output current: automatic, 40A, 20A, 10A, 5A, 2A, 1A, 200mA, 100mA, 20mA

    2.Range:                       

    Automatic (0.1-40A)  0 - 200Ω (three-phase simultaneous measurement 0 - 120Ω)

    40A   0 – 0.5Ω        (three-phase simultaneous measurement 0 – 0.3Ω)

    20A   0.0005 – 1.0Ω    (three-phase simultaneous measurement0.001–0.6Ω)

    10A   0.001 – 2.0Ω    (three-phase simultaneous measurement0.002–1.2Ω)

    5A    0.002 – 4.0Ω    (three-phase simultaneous measurement0.005–2.5Ω)

    2A    0.005 –  10Ω    (three-phase simultaneous measurement0.01 – 6.0Ω)

    1A    0.01 –  20Ω    (three-phase simultaneous measurement0.02 - 12Ω)

    200m A  0.1 – 100Ω      (three-phase simultaneous measurement0.1 - 60Ω)

    100m A   0.5 – 200Ω     (three-phase simultaneous measurement0.5 - 120Ω)

    20m A    10 – 20kΩ      only single-phase test)

    1.Accuracy: 0.2%±0.1μΩ 

    2.Minimum resolution: 0.01μΩ

    3.Working temperature: -20~ 40℃

    4.Ambient humidity: ≤80%RH, no dewing  

    5.Working power supply: AC: AC220V±10%, 50Hz±1Hz 

    6.Volume: length 420mm× width 320mm× height 200mm

    7.Net weight: 14.8kg

    III.Packing List

    No.

    Item

    Qty

    1

    Main engine

    1

    2

    Power Cable

    1

    3

    Black test line

    2

    4

    Red test line

    2

    5

    Green test line

    2

    6

    Yellow test line

    2

    7

    Grounding  wire

    1

    8

    Serial port cable

    2

    9

    Insurance tube

    2

    10

    Standard resistor

    1

    11

    USB flash drive

    1

    12

    Printing paper

    1


    变压器测试系列
    DC Resistance Test Instrument (1)

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