IS200TRPAH1BEC - Turbine Primary Trip Terminal Board

SPECIFICATIONS

Part No.: IS200TRPAH1BEC
Manufacturer: General Electric
Country of Manufacture: United States of America (USA)
MPU pulse rate range: 2 Hz to 20 kHz
MPU pulse rate accuracy: 0.05 percent of reading
MPU input circuit sensitivity: 27 mV pk
Size: 33.0 cm high x 17.8 cm , wide
Technology: Surface mount
Temperature: -30 to 65oC
Product Type: Turbine Primary Trip Terminal Board
Availability: In Stock
Series: Mark VIe

Functional Description

IS200TRPAH1BEC is a Turbine Primary Trip Terminal Board developed by GE. It is a part of Mark VIe control system. The turbine primary trip terminal board plays a crucial role in turbine control systems, particularly within the Mark VIe system. It accommodates either 12 passive pulse rate devices (four per R/S/T section) or six active pulse rate inputs (two per TMR section). These devices sense a toothed wheel to accurately measure turbine speed, providing essential feedback for control and monitoring purposes.

Features

• TMR Voted Output Contacts: The terminal board features two TMR (Triple Modular Redundant) voted output contacts, operating at either 24 V dc (H1) or 125 V dc (H2). These contacts are crucial for controlling the main breaker coil, initiating trip actions when necessary, ensuring the safety and integrity of the turbine system.
• Voltage Detection Circuits: TRPAH1A is equipped with four voltage detection circuits designed to monitor the trip string. Operating within the voltage range of 24-125 V DC, these circuits play a vital role in detecting abnormalities or malfunctions within the trip system, enabling timely intervention and preventing potential hazards.
• 'Fail-Safe' ESTOP Input: Additionally, the terminal board features a dedicated 'Fail-Safe' ESTOP (Emergency Stop) input, operating at 24-125 V dc. This input serves as a safety mechanism, allowing for the removal of power from trip relays in emergencies, ensuring the safety and integrity of the turbine system under critical conditions.

Managing Speed Input Connections:

With TRPAH1A, there are distinct guidelines for wiring to different sets of pulse inputs, each tailored to specific requirements:

• Wiring to All 12 Pulse Inputs: When wiring to all 12 pulse inputs (designated as PR1_R to PR4_T), each set of four pulse inputs is directed to its dedicated PTUR I/O pack. However, it's important to note that no jumpers are utilized in this scenario, and the configuration should be set to the STORE position.
• Wiring to TTL Pulse Inputs: Alternatively, when wiring to TTL pulse inputs (TTL1_R to TTL2_T), where each set comprises only two pulse inputs, similar guidelines apply. Each set is directed to its dedicated PTUR I/O pack, with no requirement for jumpers, set to the STORE position.

In addition to wiring configurations, jumper settings also play a crucial role in managing speed input connections, particularly for the bottom pulse inputs. Here's a breakdown of jumper configurations:

• Wiring to Bottom 4 Pulse Inputs Only: In scenarios where wiring is directed to the bottom four pulse inputs only (PR1_R to PR4_R), the same set of signals is fanned out to all PTUR I/O packs. In this case, jumpers are utilized, placed over pin pairs to ensure optimal signal distribution.
• Wiring to Bottom 2 Pulse Inputs: Conversely, when wiring is directed to the bottom two pulse inputs (TTL1_R to TTL2-R), specific considerations come into play. As the TTL signals cannot be fanned out, only the R PTUR receives the data. Therefore, no jumpers are utilized, and the configuration should be set to the STORE position.

Configuration

In the configuration of the relay terminal board within a turbine control system, jumpers JP1 and JP2 serve a pivotal role in managing the distribution—or "fanning"—of speed input signals from the R section to the other sections of the system. Specifically, these jumpers facilitate the transmission of signals from the four passive speed pickups located in the R section to the S and T section PTURs (Pulse Train Unit Receivers). This distribution is essential to ensure that all three sections of the control system receive synchronized and accurate speed data, which is critical for turbine protection, control, and overall system redundancy.

Role and Function of Jumpers JP1 and JP2

The primary function of jumpers JP1 and JP2 is to enable the fanning out of speed signals from the R section to the S and T sections. This configuration supports the Triple Modular Redundancy (TMR) structure commonly used in GE Mark VIe systems. By sharing the speed signals across all three sections, the system can perform accurate comparisons and majority voting, thereby ensuring fault-tolerant and reliable speed monitoring.

Without proper jumper placement, the S and T sections may not receive the necessary speed signal inputs, potentially leading to incomplete data, false alarms, or even failure to trip the turbine during an overspeed condition. Thus, configuring these jumpers correctly is a critical step in the system setup.

Configuration Procedure

To configure the jumpers properly, the following steps should be performed:

• Identify the Pin Pairs: Locate the designated pin pairs on the relay terminal board that correspond to jumpers JP1 and JP2. These pin pairs are typically labeled on the PCB silkscreen and are positioned close to the signal routing areas associated with the R, S, and T sections.
• Install the Jumpers: Carefully place jumper JP1 and JP2 across the specified pin pairs. This physically connects the R section’s four passive speed pickup signals to the corresponding input terminals on the S and T section PTURs. By completing this bridge, the speed signals captured in the R section can now be shared with the other sections for synchronized monitoring.
• Verify the Connections: After placing the jumpers, ensure they are securely installed and seated properly on the pins. Loose or improperly placed jumpers may result in intermittent signal transmission or data loss, which can compromise the functionality of the turbine protection system.

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

Frequently Asked Questions

What is IS200TRPAH1BEC?
It is a Turbine Primary Trip Terminal Board developed by GE under the Mark VIe series.

How are the trip relays constructed?
Trip relays are constructed using sets of six individual form A devices arranged in a voting pattern. Any two controllers that vote to close will establish a conduction path through the set, enabling the relay to actuate.

Why is detection of a shorted relay important?
Detection of a shorted relay is crucial to preserve tripping reliability. In the event of a shorted relay, it's essential to identify the issue promptly to prevent potential malfunctions or safety hazards.

How does the sensing circuit work?
A sensing circuit is applied to each set of relays. When the relays are commanded to open and voltage is present across them, the circuit detects if one or more relays are shorted. This detection signal is then transmitted to the PTUR I/O pack to create an alarm, alerting operators to the presence of a shorted relay.

How does the sensing circuit ensure reliability?
The sensing circuit utilizes relay commands from all three packs to avoid false indications. By incorporating inputs from multiple controllers, the sensing circuit mitigates the risk of false alarms, particularly in scenarios where one PTUR I/O pack votes differently from the others.