EN
MRT-3127 Series Portable High Voltage Insulation Resistance Tester
MRT-3127A / MRT-3127B Intelligent Digital High Voltage Insulation Resistance Tester, Graded DC Test Voltage, Supporting IR, DAR and PI Diagnostic Test for HV Electrical Equipment Insulation Condition Assessment.
- Description
- Specifications
- Applications
- Advantages
- FAQ
- Recommended Products
Description
MRT-3127 Series consists of two standardized portable models: MRT-3127A (max 5kV DC, maximum measuring range 2TΩ) and MRT-3127B (max 10kV DC, maximum measuring range 5TΩ). It is a cost-effective digital high voltage megohmmeter developed for routine preventive test and insulation condition evaluation of medium & high voltage electrical equipment in power substations, power plants, industrial mining enterprises and new energy power stations.
The series adopts high-efficiency DC boost circuit and high-precision micro-current sampling technology, realizing standard insulation diagnostic measurements: insulation resistance (IR), dielectric absorption ratio (DAR), polarization index (PI). The independent **GUARD shielding terminal effectively eliminates surface leakage interference caused by humid and contaminated environments and improves measurement stability.
Specifications
| Parameter | MRT-3127A | MRT-3127B |
|---|---|---|
| Max DC Test Voltage | 5000V | 10000V |
| Fixed Voltage Gears | 250V/500V/1kV/2.5kV/5kV | 250V/500V/1kV/2.5kV/5kV/10kV |
| Max Measuring Range | 2 TΩ | 5 TΩ |
| Minimum Measurement Range | 0.1 MΩ | 0.1 MΩ |
| Basic Accuracy | ±3% reading ±5 digits | ±3% reading ±5 digits |
| Max Short-Circuit Current | ≥5mA | ≥5mA |
| Test Modes | IR, DAR (Absorption Ratio), PI (Polarization Index) | |
| Terminals | HV, GROUND, GUARD shield terminal | |
| Display | 4.3" color capacitive touch screen, CN/EN bilingual | |
| Data Storage | Built-in memory, hundreds of records with timestamp | |
| Communication | USB 2.0 (U-disk export + PC software) | |
| Safety Functions | Zero start interlock, HV sound-light alarm, auto discharge, breakdown protection, over-temperature protection | |
| Power Supply | Built-in lithium battery; AC 100~240V charging adapter | |
| Continuous Battery Life | ≥7 hours | ≥7 hours |
| Operating Temperature | -10℃ ~ +50℃ | |
| Ambient Humidity | ≤85% RH (non-condensing) | |
| Enclosure | Shockproof portable reinforced plastic case with handle |
Applications
Core Test Objects
- Distribution & power transformers
- Medium voltage power cables, cable joints and terminals
- Motors, generators and rotating electrical equipment
- Switchgear, current transformers, voltage transformers
- Insulating supports, winding insulation components
Typical Application Scenarios
- Power grid operation & maintenance: routine preventive test, equipment insulation condition evaluation
- New energy power stations: wind turbine, photovoltaic transformer insulation inspection
- Industrial & mining enterprises: internal power equipment periodic maintenance
- Third-party testing institutions: engineering acceptance and insulation diagnostic testing
- Electrical manufacturers: factory quality inspection
Advantages
Cost-effective two-model gradient lineup
5kV /10kV matched for medium voltage equipment, economical choice for grassroots operation & maintenance teams
Standard IR+DAR+PI complete insulation diagnosis
Satisfy power industry preventive test specification requirements for transformer and cable insulation evaluation
GUARD anti-leakage shielding design
Solve measurement deviation caused by surface leakage under humid and polluted on-site conditions
Multi-layer safety protection system
Auto discharge, breakdown protection, high voltage alarm, zero interlock, guarantee operator safety
Battery-powered portable design
Suitable for outdoor off-grid preventive test without fixed AC power supply
FAQ
Q: How to select between MRT-3127A and MRT-3127B?
A: General selection principle:
- MRT-3127A (5kV, 2TΩ): Mainly for 10kV distribution transformers, medium voltage cables, low and medium voltage motors
- MRT-3127B (10kV, 5TΩ): For 35kV class transformers, longer HV cables and scenarios requiring higher test voltage and wider measurement range
Q: What is the function of GUARD shielding terminal?
A: The guard terminal diverts surface leakage current of insulation material. When testing under rainy, humid or dirty conditions, surface leakage will lead to low reading deviation. Connecting guard wire can bypass leakage current, so the instrument only measures internal volume insulation resistance and improves test accuracy.
Q: Difference between DAR and PI?
- DAR (Absorption Ratio): R60s/R15s, reflects medium-short time insulation absorption characteristics, widely used for cables and motors
- PI (Polarization Index): R10min/R1min, evaluates deep insulation aging and moisture ingress, primary index for large power transformers
Q: Must discharge after measurement?
A: The instrument has built-in automatic discharge circuit. But for long cables and large capacitive test objects, please wait sufficient discharge time and confirm voltage returns to zero before touching test terminals to avoid residual electric shock hazard.
