Reliable Transformer Winding Resistance Tester for Electric Power Grid Substation Maintenance

Product Description

SX-20A DC Resistance Tester

The SX-20A Transformer DC Resistance Tester is developed for fast DC resistance measurement of transformers, instrument transformers, reactors and other inductive coils.

During manufacturing and operation, DC resistance testing helps identify potential defects in winding materials, welding connections and electrical joints. It can also detect problems such as loose connections, missing strands and broken wires.

For convenient field operation, the SX-20A adopts an industrial plastic enclosure and a 7-inch color LCD. Its microprocessor-controlled system automatically completes self-checking and data processing.

The instrument also features automatic discharge, audible discharge alarms and clear discharge indication. These functions help operators monitor the discharge process and reduce the risk of incorrect operation.

With six selectable output currents and a wide resistance measuring range, the SX-20A is suitable for various electrical testing environments.

Product Features

• Industrial plastic enclosure for convenient transportation.
• 7-inch color LCD with a clear operating interface.
• Automatic self-checking and data processing.
• Automatic discharge with audible alarm.
• Clear discharge status indication.
• Protection against back electromotive force.
• Fast response and automatic measurement data refreshing.
• Six selectable test currents up to 20A.
• Wide measuring range from 100μΩ to 100kΩ.
• Real-time printing and internal storage of test results.

Applications

The SX-20A is suitable for:

• Transformer factory testing
• Transformer installation and commissioning
• Electrical equipment handover testing
• Power system preventive maintenance
• Current transformer and voltage transformer testing
• Reactor and electromagnetic coil resistance measurement

Technical Parameters

FAQ

Q1: Is the SX-20A suitable for field testing?

A: Yes. Its industrial plastic enclosure makes it convenient to carry for electrical testing work.

Q2: How does the instrument handle the discharge process?

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

Q3: What protection function does the instrument provide?

A: It provides protection against the impact of back electromotive force.

Q4: What equipment can be tested with this instrument?

A: It can measure the DC resistance of transformers, CTs, PTs, reactors, electromagnetic operating mechanisms and other inductive coils.

Q5: Can the measurement data be refreshed during tap changer switching?

A: Yes. The instrument automatically refreshes measurement data when the on-load tap changer is switched during measurement.