Short Circuit Impedance Test Instrument

Product Overview

HM5004 Low-voltage short-circuit impedance measurement is a fundamental component of routine testing. By comparing the short-circuit impedance values measured before and after a transformer experiences a short-circuit current impact, the degree of winding deformation can be preliminarily estimated based on the magnitude of change. Following a short-circuit current impact, the variation in the initial low-voltage short-circuit impedance test value should not exceed 2%.

[01] This instrument features adjustable power output capability, suitable for single-phase or three-phase transformers.

[02] Supports both built-in power supply testing and external regulated power supply testing.

[03] Complies with the testing methods and algorithm requirements specified in DL/T 1093-2008 "Guidelines for Testing and Judging Power Transformer Winding Resistance."

[04] The instrument employs phase-locked loop technology for synchronous sampling of AC signals, ensuring precise and reliable measurement data.

[05] Capable of measuring parameters including voltage, current, power, and frequency.

[06] Wide single-point measurement range for voltage and current; supports external current transformers/voltage transformers to extend measurement capabilities.

[07] Built-in passive memory for long-term storage of measurement data; equipped with a printer.

[08] Supports USB export of test data for further analysis or storage, and enables USB firmware updates.

[09] Features fully English menus and operation prompts for intuitive, straightforward operation.

[10] Large horizontal LCD screen provides clear visibility even in direct sunlight.

I.Panel Instruction：

II.Main interface introduction

III.Parameter Setting

  Connect the voltage regulator (using external power supply), the tester and the tested transformer correctly according to the wiring diagram. When using external power supply, ensure that the voltage regulator is in zero position before energizing it.

Fig1 Three-phase transformer parameter setting interface                           Fig2  Single-phase transformer parameter settinginterface

Parameter Details:

Selecting three-phase transformer from the main interface will enter the parameter setting interface of three-phase transformer in picture 1. Selecting single-phase transformer from the main interface will enter the parameter setting interface of single-phase transformer in picture 2.

The parameter meaning of the parameter setting interface is as follows:

Serial number: test transformer number, which is printed out for easy record management

Rated capacity: refers to the nominal capacity of the transformer;

Rated voltage: refers to the tap voltage where the voltage-added winding is

Test current: refers to preparing to record the result at the current point. When the current is close to the setting current during the booster test, the instrument prompts "close to the setting current" and the buzzer starts to alarm, and the booster should be stopped at this time.

Connection Type: the connection group mode of the applied voltage side of three-phase transformer, which is marked on the nameplate of the transformer.

IV.Wiring Diagram：

Internal power test three-phase transformer                                    External power test three-phase transformer

Internal power test single phase transformer                                       External power test single phase transformer

Hot Tags: Short Circuit Impedance Test Instrument, China Short Circuit Impedance Test Instrument manufacturers, factory, electrical test competitiveness testing, electrical test marketability testing, electrical test profitability testing