Megger DELTA4000 12 kV Dielectric Loss (Power Factor/tan δ) Test System | 1–505 Hz variable frequency, Individual Temperature Correction (ITC), 3.6 kVA

Megger DELTA4000 12 kV Dielectric Loss Test System

Overview

The DELTA4000 is Megger's automatic 12 kV insulation power factor/dielectric loss (tan δ) test system. In addition to 50/60 Hz testing, it uses 1 Hz power factor to help assess insulation condition. It measures at variable frequencies from 1 to 505 Hz and applies Individual Temperature Correction (ITC, patented by the manufacturer) based on the insulation under test itself. With optional accessories it can also test insulating oil and perform high-voltage TTR and CVT ratio tests.

Key Specifications

• Output: 0–12 kV continuously adjustable; 3.6 kVA; 300 mA (4 minutes), 200 mA (30 minutes), 100 mA (continuous)
• Frequency: 45–70 Hz (12 kV), 15–400 Hz (4 kV), 1–505 Hz (250 V)
• Measurements: Voltage, current, capacitance, inductance, power factor, dissipation factor (tan δ), watt losses, excitation current, tip-up
• Accuracy: Capacitance ±(0.5% of reading + 0.1 pF); PF/DF ±(0.5% of reading + 0.02%); voltage and current ±1% of reading
• Interference immunity: Electrostatic interference 15 mA; electromagnetic 500 μT
• Temperature correction: Individual Temperature Correction (ITC), 5–50 °C corrected to 20 °C
• System configurations: DELTA4110 (DELTA4100 controller + DELTA4010B HV unit, connected to a PC); DELTA4310A (built-in computer and 12-inch touchscreen)
• Dimensions and weight: Controller and HV unit each 290 × 290 × 460 mm; controller 14 kg (4300A: 17 kg), HV unit 23 kg

Applications

• Insulation diagnostics of power transformers, bushings, circuit breakers, cables, surge arresters and rotating machines.

Specifications per the Megger product page and DELTA4000 datasheet (V020) (retrieved 2026-10-21).