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Communications

Both Modbus RTU and DNP 3.0 communication protocols are

included with the iDP-210 relay. A Communications Workbench™

provides the user the ability to customize communication maps,

add or delete information, add control points, and even create new

signals to be brought out through communications. The iDP-210 relay

features two RS-232 auto-baud (57600 kbps max) communication

ports and one port configurable for RS-485, serial fiber optic, and

various Ethernet options (RJ-45, multi-mode fiber, single-mode

fiber). Contact your Eaton’s Cooper Power Systems representative

for availability of other communication protocols.

Incipient cable splice fault detector (ICSF)

One of the most common causes of buried cable failure is from

moisture ingress to buried cable splices. When sufficient water

accumulates in the splice, a line-to-ground fault briefly occurs. The

fault is cleared as the water is suddenly converted in to steam. Over

time, the insulation is damaged and the cable splice eventually fails.

The iDP-210 relay contains an algorithm to recognize the unique

waveform characteristics of these self-clearing faults. See Figure

12. By counting how often these events occur over a moving time

window, the iDP-210 relays are able to give advance notice of

pending cable splice failures. This permits cable maintenance to be

scheduled rather than addressed on an emergency basis.

Overcurrent protection

The iDP-210 relay offers inverse time, definite time (2 levels)

and instantaneous elements for phase, residual and negative

sequence overcurrent protection. An additional definite time ground

overcurrent element is provided for a separate zero-sequence flux

summing CT. This fourth current channel input may also be ordered

in a sensitive earth fault version which may be set as low as 0.005

A secondary. Each overcurrent element may be independently

selected to be non-directional, forward- or reverse-directional.

Inverse time elements may be set for disk-like or instantaneous

reset characteristics. Complete fuse-fail detection logic is also

included to selectively non-directionalize or disable directional

elements during loss of bus potential.

Motor operators

VFI switchgear may be specified with motor operators and an asso-

ciated control to allow for local or remote opening and closing of the

switches and vacuum fault interrupters via SCADA command.

Motor control is available either via the Edison Idea relays or with a

separate DC Motor Controller.

Edison Idea relays can control up to two (2) individual motors on the

operating handles. With this option, the motor control is integral to

the relay.

The stand alone DC Motor Controller may operate up to six (6) indi-

vidual motors on the operating handles. Additional motor controllers

can be supplied if more than six (6) motors are required.

Applicable standards

IEEE Std C37.74™-2003 standard, Standard Requirements for

Subsurface, Vault, and Pad-Mounted Load-Interrupter Switchgear and

Fused Load-Interrupter Switchgear for Alternating Current Systems

Up to 38kV.

IEEE Std C37.60™-2003 standard, Standard Requirements for

Overhead, Pad-Mounted, Dry Vault, and Submersible Automatic

Circuit Reclosers and Fault Interrupters for Alternating Current

Systems Up to 38kV.

IEEE Std C57.12.28™-2005 standard, Standard for Pad-Mounted

Equipment—Enclosure Integrity.

IEEE Std C57.12.29™-2005 standard, Standard for Pad-Mounted

Equipment—Enclosure Integrity for Coastal Environments–

applicable when stainless steel construction is specified.

IEEE Std 386™-2006 standard, Standard for Separable Insulated

Connector Systems for Power Distribution Systems Above 600V.

IEEE Std C37.90™-2005 standard, Standard for Relays and Relay

Systems Associated with Electric Power Apparatus.

IEEE Std C37.90.2™-2004 standard, Standard for Withstand

Capability of Relay Systems to Radiated Electromagnetic

Interference from Transceivers.

See page 25 for a list of additional information that is available from

Eaton’s Cooper Power Systems.

Technical Data 285-10

Effective April 2014

VFI underground distribution switchgear

www.cooperpower.com

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