IS200EXAMG1AAB - Exciter Attenuation Module

SPECIFICATIONS:

Part No.: IS200EXAMG1AAB
Manufacturer: General Electric
Product Type: Exciter Attenuation Module
Group Variation: H2, Dual System
Series: EX2100
Number of Channels: 13
Description: I/O Terminal Board
Ac input frequency: 480 Hz maximum
Ambient temperature: 0 to 40°C
Functionality: Field Current and Voltage Feedback
Number of Selector Settings: 8
Control Sections: Up to Three Redundant Control Sections
Operating System: Dual System
Availability: In Stock
Country of Manufacture: United States (USA)
Manual: GEI-100509B

FUNCTIONAL DESCRIPTION:

IS200EXAMG1AAB is an Exciter Attenuation Module manufactured and designed by General Electric and is part of the EX2100 Series used in Excitation turbine control systems. The Exciter Attenuation Module (IS200EXAM or EXAM), when used alongside the Exciter Ground Detector Module (IS200EGDM or EGDM), forms the ground detection system for the EX2100 Excitation Control. The EXAM is installed in the High Voltage Interface (HVI) module within the auxiliary cabinet. It acts by reducing the high voltage from the bridge, converting it to a manageable level, and providing attenuation between the field bus and the EGDM.

The EXAM and EGDM(s) are linked via the Exciter Power Backplane (IS200EPBP or EPBP). A single 9-pin cable connects the EXAM to the EPBP, while the EGDMs are connected to the EPBP through a 96-pin P2 connector. Only one EXAM is necessary for both simplex and triple modular redundant (TMR) configurations, with the interconnection remaining the same in both cases. The field voltage (Vbus+ and Vbus−) varies from 125 V dc to 1000 V dc and the ac line-to-line voltages power potential transformer (PPT) vary from 120 to 1300 V ac rms. The EXAM has two variations of filter capacitance that are selectable through jumpers JP1 and JP2.

• PPT voltages less than 750 V rms
• PPT voltages greater than 750 V rms

FUNCTIONS:

• The EGDM manages the activation for the field ground test and master selection by controlling a relay on the EXAM. This relay features a 24 V DC coil with diode suppression and operates with less than 20 mA.

• In its default state, the relay remains de-energized and provides feedback to the M1 section of the TMR control or the sole control in a simplex setup. When energized, the relay sends feedback to the M2 section of the TMR control.

• In TMR configurations, three EGDMs are set up as Controller (C), Master 1 (M1), and Master 2 (M2). Each EGDM is automatically configured via the program pins of the 96-pin P2 connector on the EPBP.

• The DSPX board sends information to EGDM C about which master provides the 50 V AC square-wave signal to the sense resistor in the EXAM. EGDM C will activate the relay in the EXAM if M2 is the master, or leave it unpowered if M1 is the master.

• This signal enables the signal generator on the active master and selects the test command source for each EGDM (M1, M2, and C). The active master then sends a positive or negative 50 V AC square-wave signal to the EXAM, which is applied to one end of the sense resistor (Rx).

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FREQUENTLY ASKED QUESTIONS:

What is the purpose of the Exciter Attenuation Module (EXAM)?

The EXAM provides attenuation between the field bus and the Exciter Ground Detector Module (EGDM) by sensing high voltage from the bridge and scaling it to a usable level. It is part of the ground detection system for the EX2100 Excitation Control.

How does the EXAM interact with the EGDM?

The EXAM and EGDM(s) are connected via the Exciter Power Backplane (EPBP). The EXAM helps in providing ground detection by relaying feedback from the ground system and ensuring proper operation of the EX2100 Excitation Control.

What is the role of the relay in the EXAM?

The relay on the EXAM is controlled by the EGDM. It helps in activating the field ground test and master selection. The relay operates with a 24 V DC coil, and its default state is de-energized. When energized, it feeds back to the M2 section of the TMR control.