GE 151X1235BC11WK01 - Network Management Industrial Switch (10/100M)

151X1235BC11WK01 - Network Management Industrial Switch (10/100M)

Energy, water treatment, intelligent control cabinet

Auto Regulator Reference (AUTO REF) generates the auto control (AC) setpoint

variable for the automatic voltage regulator (AVR). Operator commands, (raise and lower

inputs) come from direct inputs or over a data link from an HMI operator station, or from

a plant DCS or remote dispatch system.

Automatic and Manual Reference Follower (Tracking) are

software-implemented ramp functions that adjust the non-active regulator output to

automatically track the active regulator. That is, when the auto regulator is controlling the

generator, the manual regulator tracks, and when the manual regulator is controlling the

generator, the auto regulator tracks. This provides for smooth transition when a transfer

occurs from one regulator to the other.

Automatic Voltage Regulator (AVR) maintains the generator terminal voltage

constant over changes in load and operating conditions.

DCSInterface (ModBus RTU) slave data link is supported to interface with

customer DCS systems. This link uses TCP/IP support over Ethernet 10/100baseT

hardware. Both commands and data can be supported.

Exciter AVR Setpoint (EXASP) combines a number of functions to produce the

reference input to the AVR and the variables to support regulator tracking.

Generator Field Temperature Calculation measures the resistance by dividing

the field voltage by the field current. From the known field resistance at 25°C (77 °F) and

the linear resistance temperature change in copper, the algorithm calculates operating

temperature. An adjustable high temperature alarm output contact is also included.

Generator Overvoltage Trip (59G) monitors the generator armature voltage and

initiates a trip signal upon detecting an unacceptably high voltage.

Generator Simulator (GEN SIM) is a detailed generator model that is included as

part of the excitation control system software. It can be configured to closely match the

operation of the real generator. It can also be used for operator training, and can support

the checkout of regulators, limiters, and protection functions while the unit is shut down.

Hydrogen Pressure/Temperature Limiter compensates the configuration

parameters of key generator limiters and protection functions based on generator cooling.

For hydrogen-cooled generators, the correct parameter is the internal hydrogen pressure,

and for air-cooled generators, it is air temperature. The three limiters affected by

pressure/temperature compensation are:

• Underexcitation limiter (UEL)

• Overexcitation limiter (OEL)

• Stator current limiter

Loss of Excitation Protection (40) detects a loss of excitation on synchronous

machines using a two-zoned timed trip function that is based on resistance and reactance.

Manual Regulator (FVR) controls the generator field voltage or current, letting the

generator output voltage. The manual regulator, like the AVR, uses a PPI regulator with

integrator windup protection and its control output directly controls the firing command

generator that controls the gating of the power bridge when enabled