EC-20 Single Phase Faulted Circuit Indicator
The EC-20 faulted circuit indicator is a single phase, secondary voltage reset unit with remote indicator. It is designed for use on insulated cable, underground, where low current draw prevents current reset. It is also available with standard bail as on the EC-IO and the screw down mechanism as on the EC-14. The unique pull over bail sensor self mounts and has no loose parts. The unit can be installed while using insulated gloves, if safety ruled permit. The optional mounting kit provides easy field installation in transformer housing.
Edison Controls Faulted Circuit Indicators offer a number of electrical options to meet the changing requirements of modern distribution systems. More extensive use of reclosers, current limiting reactors, and phase correcting capacitor banks etc. make the selection and specification of Faulted Circuit Indicators (FCIs) more complex.
Range of Electrical Options and Specifications:
Single or Three Phase Units – A single phase FCI has a single current sensing core assembly and a single indicator viewing assembly. A three phase unit has three independent sensing cores and one indicator viewing assembly. Three phase units are designed for use on insulated cables in underground applications only.
Current or Voltage Powered Units – FCIs, single or three phase, are powered from the system line current, if the line current is greater than 0.5 amps. For applications where the line current may fall below 0.5 amps during any part of a 24 hour period, voltage powered units must be used.
Reset – Immediate or Delayed – FCIs are available with either immediate or timed reset. The immediate reset mode will reset the unit approximately 75 seconds after normal power is restored. The timed reset will delay the reset pulse for up to 72 hours after normal power is restored.
Inrush Restraint – FCIs are available with or without inrush restraint. Inrush restraint is often used to coordinate with reclosers and is available in two forms – dual trip and delayed trip. Dual trip is used when the inrush current is known. Delayed trip is used when the inrush current is not known or when it may vary over a 24 hour period.
Insulated or Non-Insulated Cables – For uninsulated cables a single phase hot stick unit must be used. For insulated cables either single phase hot stick units, remote indicating units, or three phase units may be used.
Trip Levels and Reset Levels – The trip and reset levels are system dependent and require a reasonable knowledge of operating parameters. The logic charts on pages 2 and 3 are useful in establishing the initial trip and reset levels.
Trip Level: 25 – 3000 A with repeat accuracy of +/- 10%
Reset Level: l.0A standard; 3.0A or 0.5A l00v/230V for secondary voltage reset unit.
Reset Time: resets automatically in one to four minutes after restoration,
unless timed reset is specified.
Trip Response: Normally 1 ms or less; (refer to trip response curve below)
Power requirements: Line powered
Adjacent Field Susceptibility: Immune to adjacent magnetic field tripping
Overload Capability: 40,000A peak per ANSI/IEEE 495-1986
Maximum Continuous Current (Non-trip State):
3.0A reset Models: 800A
1.0A reset Models: 300A
0.5A reset Models: 150A
Environmental Capability: Meets ANSI/IEEE 495-1986
Life Expectancy: 20 years
Trip Response Curves