AC Insulation Tester Category
Elecgene's AC insulation tester series supports a variety of insulation test methods
Our insulation test equipment helps evaluate insulation condition and performance, enabling effective insulation health assessment
Widely used in substations, power utilities, industrial plants, and electrical maintenance services
YTB-20 Series 100kVRMS AC140kV DC High-Voltage Test System
The AC voltage test sets are suitable for kinds of electrical products, electrical equipments and insulated materials, testing the insulated level of products, discovering the insulated situation of tested objects.
ESR-800 Series HV Resonant Test System (Umbrella Reactor Build in Divider )
Through the reactor of the combined device, it can output stable AC high voltage, which is mostly used for AC voltage withstand test of on-site electrical equipment, such as cross-linked cables, transformers, GIS, motors and generators.
YTB-20 Series 50kVRMS AC/70kV DC High-Voltage Test System
The AC voltage test sets are suitable for kinds of electrical products, electrical equipments and insulated materials, testing the insulated level of products, discovering the insulated situation of tested objects.
ESR-800 HV Resonant Test System
Through the reactor of the combined device, it can output stable AC high voltage, which is mostly used for AC voltage withstand test of on-site electrical equipment, such as cross-linked cables, transformers, GIS, motors and generators.
ESR-800 AC Resonant Test System
Through the reactor of the combined device, it can output stable AC high voltage, which is mostly used for AC voltage withstand test of on-site electrical equipment, such as cross-linked cables, transformers, GIS, motors and generators.
Why choose ELECGENE's AC insulation testers
1. Accurate insulation condition assessment
Advanced test methods such as infrared (IR), pulse induction (PI), and dynamic resistance (DAR) provide reliable assessment of insulation conditions.
2. Wide voltage range for wide applications
Multiple test voltage ranges support various applications in power systems.
3. Comprehensive diagnosis and data analysis
Integrate diagnostic and data logging functions, support trend analysis, help users continuously monitor insulation degradation status, and develop scientific predictive maintenance plans.
4. High safety standards, safe operation
Built-in automatic discharge and other safety protection functions to ensure safe operation in high-pressure environments.
FAQs about AC insulation testers
How Is AC Insulation Testing Different from DC Insulation Testing?
AC and DC insulation testing evaluate insulation performance in different ways.
AC Insulation Testing
Produces an electric field distribution similar to actual operating conditions.
Does not cause significant space-charge accumulation within insulation materials.
Better reflects insulation behavior under power-frequency voltage stress.
Can be combined with dielectric loss (tan δ) measurements for more comprehensive insulation assessment.
DC Insulation Testing
Applies a constant DC voltage and primarily measures insulation resistance.
Generally requires smaller and more portable test equipment.
Commonly used for routine maintenance and field testing of long cable systems.
Does not provide dielectric loss information.
The choice between AC and DC testing depends on the equipment type, testing objective, and applicable standards.
Why Is AC Testing Closer to Real Operating Conditions?
Most power system equipment operates under 50 Hz or 60 Hz AC voltage. AC insulation testing uses the same type of alternating voltage, allowing the insulation system to be evaluated under electrical stress conditions similar to those experienced during normal service.
Compared with DC testing, AC testing can:
More accurately represent electric field distribution within the insulation system.
Reveal insulation weaknesses that appear under alternating voltage stress.
Better evaluate dielectric losses, partial discharge activity, and insulation aging characteristics.
Provide results that are more representative of actual operating performance.
For this reason, AC testing is widely used for factory acceptance, commissioning, and condition assessment of high-voltage equipment.
What Types of Equipment Require AC Insulation Testing?
AC insulation testing is commonly performed on a wide range of power system equipment, including:
Power transformers and instrument transformers
Dry-type and oil-immersed reactors
Medium- and high-voltage power cables
Switchgear, ring main units (RMUs), and busbar systems
High-voltage motors and generators
Power capacitors and surge arresters
Gas-insulated switchgear (GIS)
Large power electronic equipment, including renewable energy converters and inverter systems
The test helps verify insulation integrity before equipment is placed into service and throughout its operational life.
What Is Dissipation Factor (Tan Delta) in Insulation Testing?
Dissipation factor, commonly expressed as tan δ (tan delta), is a key indicator of insulation condition. It measures the electrical energy lost within insulation materials when they are subjected to an AC voltage.
A tan delta measurement can provide valuable information about insulation health:
Lower tan delta values generally indicate good insulation condition.
Increasing tan delta values may suggest insulation aging, moisture contamination, or internal defects.
Trending tan delta measurements over time helps identify developing insulation problems before failure occurs.
Tan delta testing is often used alongside AC withstand and insulation tests to provide a more complete assessment of equipment condition.
Because insulation deterioration often develops gradually, tan delta analysis is an effective tool for predictive maintenance and asset management.
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