Epoxy Mica Capacitators

Epoxy Mica Capacitors (80 pF)

Partial Discharge Sensors for Testing High Voltage Electrical Equipment 

Iris Power’s durable Epoxy Mica Capacitors (EMCs) are designed to detect Partial Discharge (PD) activity in electrical equipment (AC motors, generators, switchgear and dry-type transformers) while not imposing on the machines operation or reliability in any way.

EMCs are permanently installed (minimum one per phase) as close as possible to the equipment to be monitored to maximize sensitivity. In order to improve noise separation, the EMCs are installed directionally or differentially, depending on the equipment.

Iris Power’s 80pF EMCs are designed to block the 50/60Hz power and allow only high frequency (>40MHz) signals to pass through, be collected and analyzed by an appropriate Iris Power portable instrument or continuous monitor.

PD monitoring is applicable to diverse equipment installations. That is why Iris Power offers four different voltage-rated capacitive couplers – 6.9kV, 16kV, 25kV and 28kV– the choice of which to install is dependent on the operating voltage of equipment.


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Product Description

Unique Features 

Mica Splittings Dielectric

EMCs are safe for use in operating equipment because they have excellent electrical properties due to an 80 mm (3 inch) layer of epoxy impregnated mica splittings as the main dielectric. In comparison, a typical 13.8kV stator coil has only about 3 mm (0.25 inch) thickness of epoxy mica paper. 

Voltage Endurance Testing 

Independent voltage endurance testing (IEEE 1043) proved that Iris Power EMCs withstand over 1000 hours at 30kVrms. According to statistical methods (IEEE 930-1987) this translates into 60,000 years of use at normal operating voltage. By comparison, the average 13.8kV coil is expected to withstand only 400 hours of exposure to 30kVrms. The EMCs excellent endurance and thermal stability is due to the use of mica splittings, as opposed to mica paper or ceramics.


  EMC Voltage Rating
  6.9 kV 16kV 25kV 28kV
DEV @ 1pC (kV) 8 15 25 28
AC Hipot (kVrms) 15 33 51 57
Mass (kg) 1.1 1.6 2.3 2.3
Height 92mm (3.6”) 127mm (5.0”) 206mm (8.1”) 206mm (8.1”)
Diameter 89mm (3.5”) 89mm (3.5”) 89mm (3.5”) 89mm (3.5”)

DC and Impulse Capability (BIL)

Iris Power EMCs have been independently tested to DC hipot and lightning impulse strengths far greater than any other apparatus in its voltage class. For example, Iris Power 16kV EMCs have passed:

  • 150kV DC hipot (50kV required by ANSI C37.20.2)
  • 150kV impulse (95kV required by ANSI C37.20.2)

Other Specifications 

  • Mica Splittings Dielectric
  • Voltage endurance tested (IEEE 1043) to >1000 hours at 30kVrms 
  • Capacitance rating: 80pF +/- 4pF
  • Dissipation factor: 0.10%
  • Sensitivity: 1 pC (ASTM D1868 and IEC 60270)
  • Bandwidth: (-3dB); 40MHz to 350MHz
  • Operating temperature range: -50°C to +130°C (-67°F to +266°F)
  • Electrical Tracking Resistant (ANSI/IEEE C37.20.2)
  • 60,000 year life (IEEE 930-1987)
  • Thermal Cycle Testing to -40°C to +150°C 

Hazardous Locations 

These EMCs can be used with Iris Power instruments certified for hazardous locations provided that they are installed in the appropriate enclosure to comply with the ATEX directive or UL certification for hazardous locations.

Radiation Environments 

EMC kits with installation material according to IEEE 323-1983 for Nuclear Power Generating Stations  are available.


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DISCLAIMER: The technical information contained herein is the result of extensive testing in the manufacturer’s laboratories. In addition any application advice given verbally, in writing or by testing corresponds to the best of our knowledge and belief. Since the use and application of any of our products lies beyond our area of control, it remains the responsibility of the user to verify the product’s suitability for their application.

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