5kV High Voltage Insulation Tester | VS-3125A

Products Details

VS-3125A 5kV High Voltage Insulation Tester is engineered for professional insulation diagnostics in high-voltage electrical systems. It is designed in compliance with IEC61010 safety standards (CAT III 600V / CAT IV 300V), ensuring safe and reliable operation in demanding field environments. Serving as a versatile core model within our high voltage insulation resistance tester series, it gives maintenance teams the quantitative data needed for predictive equipment maintenance.

This instrument provides multiple test voltage steps including 250V, 500V, 1000V, 2500V, and 5000V, making it suitable for a wide range of applications from low-voltage equipment to high-voltage transmission assets. Its high output voltage stability and precise current measurement system ensure accurate insulation resistance calculations up to 2000 GΩ under varying load conditions.

The VS-3125A integrates advanced diagnostic functions such as Polarization Index (PI) and Dielectric Absorption Ratio (DAR), enabling engineers to evaluate insulation aging, moisture contamination, and long-term degradation trends. These diagnostic features are essential for predictive maintenance programs across power distribution networks and heavy industrial facilities.

A large LCD display with a 36-segment analog bar graph visualization provides real-time readings of insulation resistance, test voltage, PI/DAR ratios, and timer status. The instrument also features automatic voltage discharge after measurement, ensuring operator safety by eliminating residual capacitive charge from the tested equipment before disconnecting leads.

Additional intelligent functions include automatic power-off after 10 minutes of inactivity, low battery warning, over-voltage detection, and audible live circuit warnings. With a rugged portable design weighing approximately 1.9 kg, the VS-3125A is suitable for both field maintenance and laboratory analysis.

Features

Feature	Description
High Test Voltage	Supports 250V to 5000V for wide application range
Ultra-Wide Measurement Range	Up to 2000G惟 insulation resistance measurement
PI & DAR Testing	Advanced insulation diagnostic for aging and moisture detection
Automatic Discharge	Safely releases residual charge after testing
Live Circuit Warning	Audible and visual alarm for energized circuits
Large LCD Display	Digital + bar graph visualization for easy reading
Auto Power-Off	Saves battery with automatic shutdown after 10 minutes idle
High Safety Standard	Complies with IEC61010 CAT III 600V / CAT IV 300V
Portable Design	Lightweight (1.9kg) for field and maintenance use
Data Visualization	Timer, voltage, resistance, PI/DAR all displayed in real time

 

Technical Parameters
Item	Specification
Model	VS-3125A
Test Voltage	250V / 500V / 1000V / 2500V / 5000V
Insulation Resistance Range	Up to 2000GΩ
Voltage Measurement	AC/DC 30–600V
Accuracy	±5% ±3dgt
Display	LCD with bar graph (36 segments)
PI/DAR Function	Yes
Short Circuit Current	Approx. 5mA
Power Supply	DC 12V (8 × C size batteries)
Operating Temperature	0°C – 40°C
Storage Temperature	-20°C – 60°C
Weight	Approx. 1.9 kg

Product Guide

1. Preparation

Ensure the instrument is powered by 8 fresh C-type batteries. Connect the red test lead to the LINE terminal, the black lead to EARTH, and the green guard lead to the GUARD terminal if guard-ring shielding is required to eliminate surface leakage current. Confirm all connections are secure.

2. Startup & Voltage Selection

Turn the rotary selector switch from the OFF position to the desired voltage range (250V, 500V, 1000V, 2500V, or 5000V). Verify battery status and confirm that no external live AC/DC voltage is present on the object under test.

3. Resistance Measurement

Press the TEST button to initiate high voltage output. Monitor insulation resistance, output voltage, and the analog bar graph display in real time. For extended continuous testing, lock the TEST button into position.

4. PI/DAR Diagnostic Testing

For long-duration diagnostic testing, run the test continuously. The instrument automatically calculates and displays PI (10-minute / 1-minute ratio) and DAR (30-second or 15-second / 1-minute ratio) values.

5. Completion & Safe Disconnection

Release the TEST button to stop high-voltage generation. The instrument automatically discharges residual charges from the test object. Wait until the voltage reading drops completely to 0V before touching or disconnecting the test leads.

Applications

The VS-3125A is widely used in:

• Power Cables: Insulation resistance and absorption ratio testing for medium- and high-voltage cables.

• Transformers & Switchgear: Routine maintenance and moisture assessment in power transformers and distribution switchgear.

• Electric Motors & Generators: Stator and rotor insulation diagnostics in industrial motors and power plant generators.

• Substation Preventive Maintenance: Routine insulation monitoring across substation busbars, bushings, and breakers.

• Electrical Installation Inspection: Safety compliance testing for industrial power distribution systems.

• Industrial Safety Testing: Quality control and insulation checking during manufacturing and field commissioning.

Weshine Advantages

Weshine Electric is a specialized manufacturer of high-voltage electrical testing instruments, committed to delivering reliable, safe, and high-precision diagnostic tools for global utilities.

1. Advanced Engineering Design: Integrates modern measurement circuits with stable high-voltage generation to ensure accurate insulation resistance readings up to GΩ levels.

2. Strict Safety Compliance: Engineered strictly according to IEC61010 standards, ensuring safe operation in CAT III 600V and CAT IV 300V environments.

3. High Measurement Precision: Precision current detection allows reliable diagnostic testing across all voltage ranges.

4. Field-Ready Durability: Rugged 1.9 kg portable casing engineered to withstand harsh substation and outdoor conditions.

5. Comprehensive System Portfolio: Integrates into our full line of electrical safety testing gear, pairing with tools such as our ground earth resistance tester.

6. Global Application Experience: Field-proven performance across power grids, EPC contractors, and industrial maintenance teams worldwide.

7. Professional Technical Support: Complete lifecycle assistance including calibration guidance, troubleshooting, and long-term service support.

8. Cost-Effective High-End Solution: Delivers professional-grade insulation diagnostic capabilities with optimized cost efficiency for international markets.