GE IS200EROCH1A Exciter Regulator Options Card

GE IS200EROCH1A Exciter Regulator Options Card

Functional Description

The EROC provides support for the regulator options: 

• GE ground detector 

• Third-party ground detectors

• Keypad support

• Terminal board power connection 

For brushless applications, the EROC supports a single third-party ground detector with up to three inputs: 

• Ground alarm input 

• Ground detector malfunction

• Diode fault monitor 

The field ground detector option is available with SCT-PPT and rotating dc exciter regulator applications.

This function is not available with brushless excitation unless a special generator instrumentation ring is

available. 

Using the EROC board, the GE ground detector finds leakage resistance to ground at any point in the

generator field circuit. The active detection system applies a low voltage with respect to ground and

monitors current flow through a high impedance ground resistor. Grounds in the generator field can be

detected even while the regulator is not running (gating IGBTs).

Features

• Constant sensitivity to grounds independent of operating voltages on the generator field

• Constant sensitivity to grounds without regard to ground location in the generator field

• Field ground location, in percent, from the physical center of the field

The EROC communicates with the keypad using RS-232C and provides data transmission to two locations in

the regulator rack. A keypad connector is located on the EROC faceplate and another on the backplane

(ERBP simplex, ERRB redundant). Only one keypad can be connected to a module. The two locations are to

support different mounting options of the keypad.

Technical Specifications