GE  151X1235DC85PC08  High-speed Digital Input Card (32DI)

GE  151X1235DC85PC08  High-speed Digital Input Card (32DI)

2.3.1 Multi-bridge and Power Bridge Redundancy

The EX2100e control multi-bridge option is available for large static exciters. This option

uses redundant controls (M1. M2. and C) with up to four full-wave SCR bridges that

share common ac input and dc output circuits. The multi-bridge configuration is

applicable to 8.000 A dc, 50/60 Hz, and may be configured as follows:

N+0. N =2. 3

N+1. N =2. 3

N+2. N =1. 2

A power bridge online

maintenance feature that uses

a 5-pole disconnect switch is

available.

All power bridges receive gating commands from the active control (M1 or M2), and

support the full field voltage and current needs of the generator field. The operator has

full control to select which of the redundant controls are active or inactive. Bi-directional

bumpless transfer between active and inactive controls is standard. In the N+1 and N+2

configurations, sophisticated monitoring and protection circuits detect a failure or

misoperation of any single power bridge, and exciter operation continues while the faulty

bridge is automatically shut down.

Product Description

GEA-S1302A 9

For public disclosure

2.3.2 WarmBackupandPowerBridgeRedundancy

The EX2100e control WBU option is available for small to medium sized static exciters,

which require power bridge redundancy, and the total power needs of the generator field

can be supported within one PCM. This option uses redundant controls (M1. M2. and C)

with two full-wave SCR bridges that share common ac input and dc output circuits.

The WBUconfiguration is a

cost-effective way to obtain

N+1 bridge redundancy

when N =1.

The active power bridge receives the gating commands from the active control (M1 or

M2) and supports the full field voltage and current needs of the generator field while the

backup power bridge’s gating circuit is inhibited. The operator has full control to select

which of the redundant power bridges is active or inactive. Bi-directional bumpless

transfer between active and inactive bridges is standard. Sophisticated monitoring and

protection circuits detect a failure or misoperation of the active power bridge, delays

transfer (if needed to clear and SCR leg fuses), and activates the backup power bridge

without operator intervention