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Home | Products | Haefely-Hipotronics | Power Factor Tester/Tan Delta | MIDAS Portable Power Factor Tester


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MIDAS Mobile Insulation Diagnostic & Analyzing System

The MIDAS is a portable power factor tester for periodic maintenance and inspection of high voltage insulation losses of electrical apparatus, especially in the harsh electrical environments experience in substations and other field locations.

Designed for testing at local power-line frequency (50/60Hz), MIDAS automatically measures and records dissipation factor (tan delta), power factor and all other relevant values of impedances. Damage or changes in the insulation material are detected rapidly and reliably. Further-more the optional built-in 3-phase Transformer Turns Ratio Meter and/or Frequency Response Analyser help detect faulty transformer windings as well as defective tap positions.

MIDAS Mobile Insulation Diagnostic & Analyzing System
Models MIDAS 2880 and MIDAS 2881


To analyze the condition and quality of high voltage insulation, the system performs automated measurement of:

  • Dissipation Factor and Power Factor.
  • Short Circuit Impedance and Excitation Current.
  • Additional measuring capabilities like Capacitance, Quality Factor, Frequency, Voltage, Current, Power Losses, Impedance, Inductance, Reactance, Spectrum Analyzer, Digital Scope and Datalogger.
  • Frequency Response Analysis.
  • Turns ratio, voltage ratio, phase displacement.
  • Trending Analysis.
  • Manual and Automatic (Sequencer) test operation.
  • Built-in high voltage supply (4kVA and 15kVA
  • Built-in, long-term stable standard capacitor.
  • Rugged, reliable and safe construction.
  • State-of-the-art integrated PC running actual Windows platform with advanced user interface.
  • Shortest equipment set-up and measuring time by an "all in one" unit. High output power allows testing of biggest class
    power transformers in the shortest time.
  • Self-explanatory user interface with large graphical colour TFT touch screen. Manual and Automatic test operation. Software assisted test planning, preparation, execution and first assessment.
  • Highest accuracy in field-testing using the latest measuring techniques as well as the highest long-term stability of system accuracy by using a gas-insulated standard capacitor as internal reference arm and self-calibrating measurement sensors.
  • Advanced interface suppression allows measurement at local power-line frequency as recommended in the related standard IEEE/ANSI 57.12.90




Max. Resolution


Dissipation Factor (Tan δ) Note 1

0 to 100


05% of rdg 0.0001

0 to 10,000%


05% of rdg 0.01%

Power Factor (cos φ) Note 1

0 to 1


05% of rdg 0.0001

0 to 100%


05% of rdg 0.01%

Capacitance Range at 50Hz Note 3

6.5pF to 56nF at 15kV


0.3% of rdg 0.3pF

8.1pF to 88nF at 12kV

1.2nF to 13F at 80V

Capacitance Range at 60Hz Note 3

5.4pF to 47nF at 15kV


0.3% of rdg 0.3pF

6.8pF to 73nF at 12kV

1.0nF to 10.8F at 80V

Inductance Range at 50Hz Note 4

140H to 1600kH at 15kV


0.5% of rdg 0.5mH

112H to 1280kH at 12kV

0.75H to 8.5kH at 80V

Inductance Range at 60Hz Note 4

117H to 1334kH at 15kV


0.5% of rdg 0.5mH

93H to 1067kH at 12kV

0.62H to 7kH at 80V

Test Voltage



0.3% of rdg 1V Note 2

Test Current (inputs A and B)

30A to 300mA


0.3% of rdg 1A

Ref Current (input CN ext.)

30A to 300mA


0.3% of rdg 1A

Test Frequency

15 to 400Hz


0.1% of rdg 0.1Hz

Apparent Power S

≤ 1mVA


0.8% of rdg 1mVA

Real Power P

≤ 1mW


0.8% of rdg 1mW

Reactive Power Q

≤ 1mvar


0.8% of rdg 1mvar

Output Voltage (Model 288x)

80V to 12kV

Output Voltage (Model 288x G)

80V to 15kV

Output Frequency

15Hz to 400Hz

Output Current

150mA continuous, (450mA maximum 5 minutes)

≤ 1500VA    1501 to 2000VA    2001 to 3000VA    3001 to 4000VA

Output Power Duration

Continuous,    30 min On/1 hr Off,    5 min On/1 hr Off, 1 min On/1hr Off

Output PD Level (maximum)


Internal Cn (reference)

100pF, tan delta 0.00002, Capacitance constancy <0.01%/year, Temp. coefficient <0.01%/K



Operating Temperature

-10C to 50C

Storage Temperature

-20C to 70C

Humidity (maximum)

5 to 95% R.H non-condensing



Protected Classes, Standards

IP20, IEC 61010, CE mark
General IEC 61326-1, IEC 61000-4-X, IEC 61000-3-X, EN 55011, ANSI/IEEE C37.90

Safety Specification

VDE 0411/part 1a, IEC/EN 61010-1:2002


General Specifications


12-inch TFT, 800 x 600, integrated Touch-Screen

Operating System

Embedded Windows

Measuring Time

0.3 second/measurement at averaging = 1

Measuring Channels

Two (2) Cn and Cx

Interfaces (PC Head 2880)

USB, Ethernet, RS-232, Mouse, Keyboard, Thermal Printer

Data Format


Power Supply

100V to 240V AC selectable, 50/60Hz, 1kW, active PFC (IEC 61000-3-2)

Calibration Interval

2-years (recommended)

Dimensions (Instrument Box)

Instrument Box: 34cm x 47cm x 104cm

PC Head: 30cm x 42cm x 26cm

Trolley: 33cm x 68cm x 112cm


Instrument Box: 58kg

PC Head: 7.5kg

Trolley: 11kg


Note 1:

Accuracy valid 50/60Hz

Note 2:

Accuracy valid for voltage >1000V

Note 3:

Can be expanded with optional Resonating inductor

Note 4:

Can be lowered with optional Current Booster
 Accessories and Options  see more >>

Ordering Information

Haefely Hipotronics MIDAS 2880

System with touch screen operated PC head as system controller. Max. output voltage 12kV

Haefely Hipotronics MIDAS 2880G

System as above but with maximum output voltage of 15kV.

Haefely Hipotronics MIDAS 2881

System with laptop as system controller. Max. output voltage 12kV

Haefely Hipotronics MIDAS 2881G

System as above but with maximum output voltage of 15kV.


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Macey's Electrical Pty. Ltd.
ABN 17 344 601 468
Unit 1, 49 Gavenlock Road, Tuggerah, NSW Australia 2259
Phone: +61 2 4353 4644    Mobile: 0412 678 925