GE IS200ESELH3AAA

The IS200ESELH3AAA is a 6-channel excitation selection board card dedicated to the GE EX2100 excitation system. Its core responsibility is the distribution of thyristor trigger pulses and the redundant and non-intrusive switching of dual controllers. It features on-board self-diagnosis, natural cooling, and anti-interference capabilities, and is widely used in the excitation cabinets of large synchronous generators in thermal power, hydropower, and nuclear power plants. The backplate of the frame is installed in pairs to achieve hot standby redundancy, ensuring the continuous and stable excitation of the generator. It is a key spare part for the excitation system of power plants.

Core Function

1. Gate pulse reception and distribution: The EMIO board receives 6 TTL thyristor gate trigger pulses, and distributes the pulse signals to the EGPA (Excitation Gate Pulse Amplifier Board) of the power cabinet. After amplification by the EGPA, it drives the SCR rectifier bridge to control the excitation current.

2. Redundant channel selection and disturbance-free switching system with dual controllers M1/M2, the ESEL board selects the primary/backup channel under the logic management of controller C. When the main channel fails, it will switch to the backup channel without disturbance. The generator excitation will not be interrupted, and it will not cause the unit to trip or the power grid to fluctuate. When configuring redundantly, the system needs to configure two ESELH3AAA blocks, which are driven by M1 and M2 respectively.

3. The on-board BITE self-diagnostic board card is equipped with self-checking hardware to monitor the power supply, pulse channels, and component status of the board card. The fault signal is uploaded to the Mark VIe engineer station to locate the excitation circuit fault, with a built-in status LED indicator light.

4. Fault Isolation: When a single-channel pulse is abnormal, the hardware logic of the board card isolates the faulty branch to prevent the fault from spreading to the entire excitation control circuit.

5. The signal interface serves as a backplane bus interface and an external cable interface to isolate and forward low-level logic pulse signals, isolating the low-voltage logic side of the main control from the power amplification side.

Product Advantages

1. The H3 version of the 6-bridge drive hardware configuration comes standard with 6 bridge drivers, supporting complete 6-pulse SCR rectification excitation. Compared with H1/H2, it has the largest number of channels and is suitable for large-capacity units.

2. Supports two configurations: simplex and dual-redundancy.

Simplex: Only 1 ESEL, simple unit;

Redundancy: Two ESEls are used in pairs, supporting online hot standby and maintenance without downtime, which is a mainstream solution for industrial power stations.

3. Modular rack installation standard GE Mark VIe rack slot installation, backplane connector, plug and pull replacement, convenient maintenance and spare parts replacement.

4. The natural air-cooling design board card passively dissipates heat without the need for an independent fan, reducing mechanical failure points and making it suitable for long-term continuous operation of power plant control cabinets.

5. The hardware protection circuit is equipped with built-in overvoltage and short-circuit protection to suppress surges in the pulse circuit and protect the board card and the front-end EMIO board.

6. The high-reliability industrial wide-temperature design is specially designed for continuous 24-hour operation of power stations. It is resistant to vibration and electromagnetic interference, meeting the strong electromagnetic environment of power plants.

7. The LED panel of the diagnostic visualization board card directly indicates the power supply, activation status, and gate pulse output status, enabling quick on-site initial judgment.

Application scenarios

1. For large-scale thermal power plants (300MW/600MW grade), the EX2100 excitation system is suitable for generator terminal voltage regulation and reactive power regulation.

2. Excitation transformation of synchronous generators in hydropower stations and new units Mark VIe/EX2100 excitation cabinets for hydroelectric turbine generator sets.

3. Excitation Control of Nuclear Power conventional Island Generators: The excitation regulation of nuclear power conventional island generators has extremely high requirements for system reliability and fault tolerance.

4. Excitation cabinets for gas turbine + steam turbine generator combined cycle units of large-scale self-owned power plants and combined cycle power stations, and GE gas turbine Mark VIe control systems.

5. Spare parts replacement and expansion renovation project when upgrading the original Mark V excitation system of the old unit to EX2100.

Applicable equipment: Static excitation system of synchronous generator, not used for speed regulation of ordinary motors.

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