High-Precision Multi-Channel Transformer DC Resistance Tester 20A Winding Ohmmeter Device with Touchscreen Data Storage for Electric Power Grid Substation Maintenance & Quality Diagnostics

Product Description

SX-20A Transformer DC Resistance Tester

SX-20A Transformer DC Resistance Tester is designed for measuring the DC resistance of transformer windings, instrument transformers, reactors and other inductive coils. DC resistance measurement is an essential test during manufacturing, factory inspection, installation, handover and preventive maintenance.

The instrument helps identify potential defects such as poor material selection, welding defects, loose connections, missing strands and broken wires in inductive windings.

Featuring a microprocessor-controlled system, the SX-20A automatically performs self-checking and data processing. Its wide measuring range, six selectable output currents, fast response and strong anti-interference capability make it suitable for various DC winding resistance testing applications.

Product Features

• Six selectable test currents, with a maximum output of 20A.
• Wide measuring range from 100μΩ to 100kΩ.
• 7-inch color LCD for clear operation and data display.
• Automatic data refreshing during on-load tap changer switching.
• Automatic discharge with audible alarm and clear discharge indication.
• Protection against back electromotive force.
• Built-in English operating interfaces.
• Real-time printing and storage of up to 500 test records.
• USB data export and RS485 communication interface.

Applications

Suitable for DC resistance measurement of:

• Power transformer windings
• Current transformers (CT)
• Voltage transformers (PT)
• Reactors
• Electromagnetic operating mechanisms

Applicable to factory testing, installation, handover testing and preventive maintenance.

Technical Parameters

FAQ

Q1: What is the SX-20A Transformer DC Resistance Tester used for?

A: It measures the DC resistance of transformer windings and other inductive coils to identify potential manufacturing defects and operating problems.

Q2: What is the maximum test current?

A: The maximum output current is 20A, with six selectable current ranges.

Q3: Can it measure CT and PT winding resistance?

A: Yes. It is suitable for DC resistance measurement of current transformers and voltage transformers.

Q4: Can test results be exported?

A: Yes. Test data can be transferred through the USB interface or RS485 communication interface.

Q5: Does the instrument support automatic discharge?

A: Yes. It features automatic discharge, audible alarms and discharge status indication.