Transformer Short-circuit Impedance Tester

Product Introduction

Low-voltage short-circuit impedance testing is the most direct method to assess whether a transformer's windings have deformed after being subjected to short-circuit current impacts during operation, or mechanical shocks during transportation and installation. This test is crucial for determining whether a transformer can be put into service and serves as one of the criteria for deciding if a transformer requires disassembly inspection.

The MEBDR Transformer Short-Circuit Impedance Tester incorporates an internal adjustable power supply output, making it particularly suitable for on-site low-voltage short-circuit impedance measurements on main transformers rated at 110kV and above.

Product Parameter (specification)

1) Measurement Accuracy	Voltage, Current;Class 0.2 Power;COSφ > 0.1;Class 0.5; COSφ ≤ 0.1Class 1.0; ImpedanceCOSφ > 0.1;Class 0.5; COSφ ≤ 0.1;Class 1.0
2) Voltage Measurement Range	AC 3V to 600V
3) Internal Power Supply Output Range	Voltage 0 to 250V, Current 0 to 10A
4) Current Measurement Range	AC 0.2A to 20A
5) Operating Temperature	-10°C to 50°C
6) Operating Humidity	0% to 80% RH
7) Power supply	AC 220V ±10%, 50Hz ±1Hz
8) Dimensions	360mm × 220mm × 150mm
9) Instrument weight	5kg

Product feature and application

1) The instrument features an adjustable power supply output. Whether testing single-phase or three-phase transformers, only one wiring connection is required for the instrument to complete measurements on all winding pairs, simplifying testing and wiring.

2) Supports both internal power supply testing and external voltage regulator power supply testing.

3) Complies with the tests and algorithms specified in DL/T1093-2008 "Guidelines for Detection and Evaluation of Power Transformer Winding Deformation Using the Reactance Method."

4) DL/T1093-2008 explicitly states: 5.4.1a, "Single-phase parameters shall be tested using the single-phase method in principle"; 5.4.1e, "When test results are abnormal, retest all winding pairs using the single-phase method." This instrument employs a single-phase measurement approach. For three-phase transformers, it automatically calculates the short-circuit impedance, reactance, and inductance values for each phase during the three-step voltage-rising process.

5) Utilizes phase-locked loop technology internally for synchronous sampling of AC signals, ensuring accurate measurement data.

6) Measures voltage, current, power, frequency, and other parameters.

7) Wide standalone voltage and current measurement range, with support for external CTs and PTs to further expand measurement capabilities.

8) Built-in non-volatile memory for long-term storage of measurement data; includes an integrated printer.

9) Supports USB export of test data for further analysis or storage, and USB firmware updates.

10) Fully English menus and operation prompts for simple, intuitive operation.

11) Transflective large-screen LCD for clear visibility under direct sunlight.

Prodection details

1. Conduct low-voltage short-circuit impedance testing on transformers rated 110kV and above prior to factory shipment and commissioning, retaining original records;

2. Inspect winding deformation following nearby sudden short circuits, transportation, or mechanical impacts during installation;

3. Measure transformer parameters including voltage, current, power, frequency, short-circuit impedance, reactance, and inductance during routine testing;

4. Supports single-phase, three-phase transformer, and zero-sequence impedance testing, accommodating internal/external power supply scenarios to meet field testing requirements.

Company Qualifications

FAQ

1)What is the primary purpose of the MEBDR-W Transformer Short-Circuit Impedance Tester?

Answer: The primary function of this instrument is to perform low-voltage short-circuit impedance testing and zero-sequence impedance testing on single-phase and three-phase transformers rated at 110kV and above. By analyzing the measurement results, it determines whether transformer windings have been deformed due to short-circuit current impacts, transportation, or mechanical shocks during installation. It also retains original records, providing a basis for evaluating transformers during factory release, commissioning, and post-fault operation, in compliance with relevant national standards.

2)What power supply test modes does the MEBDR-W Transformer Short-Circuit Impedance Tester support? What are the key operational differences?

Answer: The instrument supports two modes: internal power supply testing and external voltage regulator testing. Key differences are: During internal testing, the built-in adjustable power supply eliminates manual voltage adjustment. After initial wiring, it automatically completes measurements and cyclic testing for all winding pairs. For external testing, first set the voltage regulator to zero before energizing. Manually operate the regulator to apply voltage during testing, slowing the adjustment speed when approaching the set current.

3)What core safety requirements must be followed when using the MEBDR-W Transformer Short-Circuit Impedance Tester?

Answer: Core safety requirements include: 1. Use only the dedicated power cord specified for the product. Ensure reliable grounding of the instrument's chassis grounding terminal and the power cord's grounding wire. 2. Do not arbitrarily plug or unplug test leads when connected to live terminals; 3. Do not operate without the instrument cover, in damp or explosive environments, and avoid touching exposed circuits or live metal parts; 4. If the instrument exhibits suspicious malfunctions, have it inspected by our professional maintenance personnel; do not continue operation.

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