IS200EXHSG1ACB - Exciter High-Speed Relay Driver Board

SPECIFICATIONS

Part No.: IS200EXHSG1ACB
Manufacturer: General Electric
Country of Manufacture: United States of America (USA)
Product Type: Exciter High-Speed Relay Driver Board
Repair: 3-5 Days
Availability: In Stock
Series: EX2100

Functional Description

IS200EXHSG1ACB is an Exciter High-Speed Relay Driver Board developed by GE. It is a part of EX2100 excitation system. The Exciter High-Speed Relay Driver board is an integral component of the EX2100 Excitation Control system. The board is specifically designed to integrate seamlessly with the Excitation Control system. This system is responsible for managing the excitation of synchronous generators, which is crucial for maintaining voltage stability and reactive power control in power generation. The high-speed capabilities of the EXHS board complement the overall functionality of the EX2100 system, contributing to its ability to provide precise and responsive control over the generator's excitation. This, in turn, enhances the stability and reliability of the power generation process.

Features

• DC Contactor Drivers: The board includes drivers for DC contactors, designated as (41). These contactors are essential for controlling the flow of direct current in the excitation system. By providing reliable and rapid switching capabilities, the board ensures that the DC contactors can respond quickly to control signals, maintaining precise control over the excitation process.
• Pilot Relays for De-Excitation: Drive pilot relays that handle the de-excitation process. De-excitation involves reducing the excitation current in the generator field winding, which is necessary for safely shutting down the generator or reducing its output. The board's high-speed operation ensures that de-excitation can be performed swiftly and accurately, protecting the generator and associated equipment from potential damage due to slow or improper de-excitation.
• Field Flashing Relays: The board also drives relays involved in the field flashing process. Field flashing is the initial energization of the generator's field winding to establish the necessary magnetic field for voltage build-up. By controlling the field flashing relays, the EXHS board facilitates the smooth start-up of the generator, ensuring that the excitation system can quickly and reliably bring the generator to its operational state.

Pilot Relays

• Simplex Control Configuration: For simplex control, the EXHS board is configured to manage two flashing relays via two specific high-speed relay drivers, designated as EXHSG2 and EXHSG4. The pilot relays on the EXHS board are powered by a 24 V DC supply from the M1 controller. Each flashing relay is driven by one pilot relay, which uses two series contacts for its operation. This ensures reliable and controlled activation of the flashing relays. Each EXHS board also includes two drivers for 41 DC contactors. These drivers are controlled by an external driver located on the EMIO (Excitation Master I/O) board. The EMIO driver requires a command signal from the Field Programmable Gate Array (FPGA) and the closure of the 86G contact before it can energize the driver. Importantly, the driver can be de-energized by either the FPGA or the 86G contact, providing a fail-safe mechanism to prevent unintended activation.
• Redundant Control Configuration: For redundant control, the configuration becomes more complex to ensure higher reliability and fault tolerance. In this setup, EXHS boards labeled EXHSG1 and EXHSG3, along with inputs from three controllers (M1, M2, and C), control three relays arranged in a 2-out-of-3 voting circuit. This means that at least two of the three inputs must agree (vote) to activate the relays, enhancing the system’s reliability by mitigating the risk of a single point of failure. The relay coils in this redundant setup are powered by 24 V DC supplies from both M1 and M2 controllers, ensuring that even if one power source fails, the system can continue to operate effectively. This redundancy in power supply is crucial for maintaining continuous and reliable control over the excitation system.

Contact Inputs

• The Exciter High-Speed Relay Driver board interfaces with several auxiliary contacts to monitor the operational status and provide critical feedback to the excitation control system. These auxiliary contacts, labeled 53A, 53B, and 41, are brought into the EXHS board for real-time monitoring via the EMIO (Excitation Master I/O) board. The primary function of these contacts is to provide status signals that indicate various operational states of the excitation system components, ensuring that the system functions correctly and efficiently.
• In a simplex control configuration, the signals from the auxiliary contacts 53A, 53B, and 41 are directed exclusively to the EMIO within the M1 controller. The monitoring of these contact inputs is straightforward, with the signals being processed by the EMIO to ensure accurate status feedback for the excitation control system. The contact inputs are wetted by a 70 V DC supply provided by the board, essential for ensuring reliable contact closure and signal integrity. The power supply for wetting the contacts comes through plugs J12M1 and J12M2, which are resistor-isolated to protect against electrical noise and potential faults. The wetting voltage can vary within a range of 63 to 84 V DC, accommodating minor fluctuations without compromising the reliability of the contact signals.
• In a redundant control configuration, the signals from the auxiliary contacts are distributed, or fanned out, to multiple controllers: M1, M2, and C. This redundancy ensures that the failure of a single controller does not lead to a loss of critical monitoring capability. Each of the controllers (M1, M2, and C) receives the contact input signals, allowing the system to implement a more robust and fault-tolerant monitoring mechanism. The wetting voltage mechanism remains the same as in simplex control, with 70 V DC supplied from the board, and the voltage range of 63 to 84 V DC ensuring consistent performance. The contact input signals are processed by the monitoring circuit on the EMIO, ensuring that all controllers receive accurate and timely status updates.
• The contact input signals are crucial for the proper functioning of the excitation control system. They provide necessary feedback on the status of various components, allowing for timely interventions and adjustments. In both simplex and redundant configurations, the EMIO plays a pivotal role in processing these signals. It ensures that the information is accurately relayed to the relevant controllers. The fanning out of signals in redundant control configurations significantly enhances system reliability, ensuring continuous monitoring and control even in the event of a single controller failure.

The WOC team is always available to help you with your EX2100 requirements. For more information, please contact WOC.

Frequently Asked Questions

What is IS200EXHSG1ACB?
It is an Exciter High-Speed Relay Driver Board developed by GE under the EX2100 series.

What are the auxiliary contacts used in the board?
The auxiliary contacts used in the board are labeled 53A, 53B, and 41. These contacts provide status signals that indicate various operational states of the excitation system components.

How are the auxiliary contacts monitored in simplex control?
In simplex control, the signals from auxiliary contacts 53A, 53B, and 41 are directed exclusively to the EMIO within the M1 controller. The EMIO processes these signals to ensure accurate status feedback for the excitation control system.

How are the auxiliary contacts monitored in redundant control?
In redundant control, the signals from the auxiliary contacts are distributed, or fanned out, to multiple controllers: M1, M2, and C. Each controller receives the contact input signals, which are then processed to ensure a robust and fault-tolerant monitoring mechanism.