ZF310BThree channel transformer DC resistance tester

1 Overview

The DC resistance of transformers is a necessary test item for semi-finished and finished products in transformer manufacturing, factory testing, installation, handover testing, and preventive testing by the power department. It can effectively detect manufacturing defects such as material selection, welding, loose connection parts, missing strands, and broken wires of transformer coils, as well as hidden dangers after operation.In order to meet the needs of rapid measurement of DC resistance in transformers, our company has developed using our own technological advantages了ZGF310B Three Channel Transformer DC Resistance TesterThe instrument is a collectionThree phase testing（and Y,andDemagnetization functionThe new generation of rapid testing equipment integrated into one isIdeal equipment for measuring the DC resistance of large power transformers.The screen adopts a large high-resolution LCD display, which is convenient for on-site use and has a Chinese menu prompt function. The operation is simple and intuitive, and all direct resistance testing items can be completed in one wiring. The testing speed is fast, the accuracy is high, and the range is wide.

2 Performance characteristics

2.1 For the testing of windings with star connections and neutral point leads, the instrument can adopt a three-phase simultaneous measurement method for testingA0TheB0TheC0The resistance of the phase saves testing time. And test it firstA0The data of the phase is tested simultaneously in three phases, which solves the problem of the inability to test the neutral point lead out resistance when testing three phases simultaneously, making the test data closer to the single-phase test value.

2.2 ForThe instrument can perform three-phase automatic testing and convert the three-phase unbalance rate for Y-shaped and △ - shaped winding testing.

2.3 The instrument has demagnetization function to reduce the harm of transformer residual magnetism during high current testing.

2.4 instrumentIt has multiple protection functions such as back electromotive force protection, wire breakage protection, and power-off protection.

2.5 instrumentWide measurement range, achievable200Ω, high precision.

2.6 Clock and date display without power failure; The data storage methods are divided into local storage and USB storage, among which local storage can store test data200 items; The USB flash drive stores data in Word format, which can be directly edited and printed on a computer.

2.7 Thermal printer printing function, fast and silent.

2.8 Small size, light weight, convenient to carry and use.

3 Technical indicators

3.1Range:

single-phase: 20 A 0.500mΩ～1.000Ω 10A 1.000mΩ～2.000Ω

5A 10.00mΩ～4.000Ω 1 A 100.0mΩ～20.00Ω

0.1A 1.000Ω～200.0Ω

three-phase: 10A + 10A 1.000mΩ～0.800Ω 5 A + 5 A 10.00mΩ～1.600Ω

1 A + 1 A 100.0mΩ～8.000Ω

3.2Accuracy:± (reading x 0.2%+2 words)

3.3 Resolution:0.1uΩ

3.4 Working power supply:AC220V±10%, 50/60Hz

3.5 Operating temperature:-10℃～50℃

3.6Relative humidity:<90%, no condensation

3.7instrumentvolume410×290×220mm

3.8Instrument weight:8.7Kg (excluding test line)

ZF310BThree channel transformer DC resistance tester

Introduction to Panel 4 and Wiring Terminals

4.1 Test wiring area: Yellow, green, red, black4-color terminal block, corresponding to A, B, C phases and neutral point O respectively, and connected to the spring side of the test wire (yellow, green, red, black) rod. The other end of the test wire has 4-color test pliers in yellow, green, red, and black, which can be connected to any winding of the transformer high, medium, or low voltage (if there is no neutral point O bushing, the black test pliers can be suspended in the air).

4.2 display: 320 × 240 dot matrix LCD with LED backlight, displaying operation menu and test results.

4.3 Key: Used for operating instruments. ↑↓ "is the" up and down "key, which allows you to move or modify data; “←→”

forLeft and right "keys, select to move or modify data; Confirm "button to confirm the current operation; 'Take'

eliminate”Press the key to abandon the current operation.

4.4 USB interface: External USB drive for storing test data, please useA USB flash drive in FAT or FAT32 format. at

During the storage process, it is strictly prohibited to remove the USB drive.

4.5 printer: Print the test results.

4.6 Grounding terminal: The instrument must be reliably grounded. The on-site grounding point may have paint or rust, and must be cleaned thoroughly.

4.7 power switch: Whole machine power switch and power socket,The fuse socket is integrated with the power socket, and the specification of the fuse is250V/5A， The size of the safety tube should be of the same specification, with dimensions of φ 5mm × 20mm.

5 Operation and usage instructions

5.1 Test wiring

The yellow, green, red, and black test clamps of the test line are connected to the high voltage of the tested object(Medium or Low Voltage)End of EndATheBTheCTheOSleeve (if there is no neutral point)OSleeve, just hang the black test pliers in the air.

5.2 Printer Instructions

The printer buttons and printer indicator lights are integrated. After the printer is powered on, the indicator light is normally on, but it flashes when there is a shortage of paper. Press the button once, and the printer will feed paper.

Printer self-test: Press and hold the button while powering on the printer to print a self-test strip.

Printer paper change: Pull out the rotary wrench and open the paper compartment cover; Load the printing paper and pull out a section(Exceeding the teeth for tearing paper), pay attention to placing the paper neatly, with the direction of the paper facing upwards on the side with the medicine (smooth surface); Close the paper compartment cover, press the print head along the paper axis until the printing paper is aligned, apply slight force to press the print head back onto the paper axis, and push the rotary wrench into the reset position.

5.3 Usage and Operation

After all test lines are connected, turn on the power switch and enter the instrument after initializationMain menu screen (see Figure 2).

At this time, the top bar displays the running time of the instrument, the middle displays the instrument model, manufacturer information, and function options, and the bottom displays the software version number and instrument number.

pressSelect the corresponding function option with the "up and down" and "left and right" keys, and press the "confirm" key to enter the selected function menu.

6 Precautions

1In the no-load voltage regulating winding, it is not allowed to switch the no-load tap changer during the testing process or before the power is fully discharged.

2During the testing or discharging process, it is not allowed to dismantle the test line or cut it offAC220V power supply.

3During the high-voltage terminal testing process, the medium and low voltage terminals of the transformer must be open circuited.