Megger DELTA 4000 Series 12 kV Insulation Diagnostic System

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Megger DELTA4000 Series 12 kV Insulation Diagnostic System
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Megger Delta-4000
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Delta-4000 Datasheet

The new DELTA4000 Series is a fully automatic 12 kV insulation power factor/dissipation factor (tanδ) test set designed for condition assessment of electrical insulation in high voltage apparatus such as transformers, bushings, circuit breakers, cables, lightning arrestors and rotating machinery. In addition to performing insulation power factor tests, the DELTA4000 Series can be used to measure the excitation current of transformer windings as well as to perform automatic tip-up tests and HV turns-ratio testing (an optional TTR Capacitor is available).

The test set is designed to provide a comprehensive AC insulation diagnostic test. The high power variable frequency design generates its own test signal independent of line frequency quality and the hardware design uses the latest technology available for digital filtering of the response signal. As a result, the DELTA4000 Series produces reliable results and stable readings in the shortest time with the highest accuracy, even in high interference substations.

The DELTA4000 Series operates with PowerDB software for automatic testing and reporting or with Delta Control software for real-time manual testing.

Measurements include voltage, current, power (loss), tan delta, power factor and capacitance. The test results are automatically stored in the computer and can also be downloaded directly to USB storage or a printer.
Megger Delta-4000 Features
  • Easy to use with automatic and manual operation
  • Accurate and repeatable measurement results with high noise suppression for the most extreme conditions
  • Lightweight, rugged two-piece design, with unit weights of 14 kg and 22 kg
  • New built-in intelligent temperature correction eliminates the need for temperature correction tables (patent pending)
  • New automatic voltage dependence detection (patent pending)
Megger Delta-4000 Specs
Input Power 90 - 264 V
45 - 66 Hz
16 A max
Output Voltage 0 to 12 kV, continuously adjustable
Test Frequency Range 45-70 Hz (12 kV)
0.0001 Hz maximum resolution
Output Power 3.6 kVA
Output Current 300 mA (4 minutes)
200 mA (30 minutes)
100 mA (continuous)

The power supply capacity can be expanded to 4 A at 12 kV using the optional Resonating Inductor, (Cat. No. 670600-1).

Measuring Ranges
Voltage 25 V to 12 kV, 1 V resolution
Current 0 to 5 Amps, 0.1 μA maximum resolution. The measurement can be corrected to either 2.5 kV or 10 kV equivalents.
Capacitance 0 to 100 μF, 0.01 pF maximum resolution
Inductance 6 H to 10 MH, 0.1 mH maximum resolution
Power factor 0-100% (0-1), 0.001% maximum resolution
Dissipation factor 0-100 (0-10,000%), 0.001% maximum resolution
Watt Loss

0 to 2 kW, actual power, 0 to 100 kW when corrected to 10 kV equivalent. 0.1 mW maximum resolution. The measurement can be corrected to either 2.5 kV or 10 kV equivalents.

Noise Immunity

15mA induced noise into any test lead with no loss of measurement accuracy at maximum interference to specimen current of 20:1

Electromagnetic 500 μT, at 50/60 Hz in any direction
Temperature Operating: -20 to +55° C (-4 to +131° F)
Storage: -50 to +70° C (-58 to +158° F)
Relative humidity Operating: 0 to 95% non-condensing
Storage: 0 to 95% non-condensing
Megger Delta-4000 Applications
  • Power transformers
  • Distribution transformers
  • Instrument transformers
  • Rotating machines
  • Oil insulation
  • Bushings
  • Cables
  • Capacitors
  • Circuit breakers
  • Surge arrestors


Test Capabilities:
  • Power factor
  • Dissipation factor
  • Excitation current
  • Automatic tip-up
  • Watts loss
  • Inductance
  • Capacitance
  • Voltage
  • Current
  • Turns ratio