10 kV/12 kV Dielectric Loss Tester for Transformer, CT PT, and Electrical Insulation Testing During Preventive Maintenance

Product Description

SXJS-III Tan Delta Tester

This Tan Delta Tester provides capacitance and tan delta measurement for insulation condition testing of electrical equipment. It can be applied to transformers, CT and PT equipment, bushings, capacitors and surge arresters, making it suitable for power utilities, transformer manufacturers and electrical maintenance teams performing installation, commissioning, handover and preventive tests.

A variable-frequency power supply is used to improve measurement performance under practical power-system conditions. The tester automatically changes frequency and processes measurement data through its electronic control system, while 45 Hz and 55 Hz pure sine-wave outputs are available. With a 0.5–10 kV test voltage range and automatic voltage application, the instrument supports efficient dielectric loss testing without relying on a fixed-frequency power source.

Product Parameters

Product Advantages

• Wide Equipment Coverage — Supports dielectric loss testing for several types of high-voltage insulation equipment.
• Pure Sine-Wave Output — Provides 45 Hz and 55 Hz pure sine-wave test signals for measurement.
• Digital Measurement Technology — Uses microcontroller-based frequency conversion, A/D conversion and data calculation.
• Practical Field Application — The design addresses dielectric loss measurement requirements where power-system interference can affect testing.

Application Scenarios

1. Transformer manufacturing and maintenance testing
2. CT and PT insulation condition testing
3. Power substation preventive maintenance
4. Electrical equipment installation and handover testing
5. Power plant insulation diagnostics
6. Electrical maintenance department testing

FAQ

Q1. What does a tan delta test measure?
A: The tester measures dielectric loss and capacitance parameters to evaluate the insulation condition of applicable electrical equipment.

Q2. Can this tester be used for CT and PT testing?
A: Yes. It is suitable for dielectric loss testing of instrument transformers.

Q3. What voltage can be applied during testing?
A: The voltage setting range is 0.5–10 kV, with automatic voltage application.

Q4. Why does the tester use variable-frequency technology?
A: Variable-frequency technology helps improve resistance to power-system interference and supports practical field dielectric loss measurements.

Q5. What accuracy is available for tan delta measurement?
A: The specified tan delta accuracy is ±(Reading * 1% + 0.00040).