GE IS200ERDDH1ABA Exciter Regulator Dynamic Discharge Board

Technical Specifications

Model: IS200ERDDH1ABA

Brand: GE（GE Vernova）

Product Type: Exciter regulator dynamic discharge board

Matching System: GE Speedtronic Mark VI turbine control system, EX2100 generator excitation system

Installation Backplane: ERBP backplane for simplex; ERBP+ERRB backplane for TMR redundant configuration

Power Supply: 24VDC rack power supply, working voltage 18‑30VDC

Bus Interface: Dual 96‑pin P1/P2 VME backplane connectors

Monitoring Function: DC‑link voltage sampling, field voltage feedback, RTD bridge temperature detection

Drive Function: Thyristor gate trigger output, control K41 de‑excitation relay and K3 charging relay

Isolation: 1500Vrms optical isolation for feedback signal circuit

Indicator: On‑board LED indicators for power supply, running status and fault alarm

Installation: 6U single‑slot VME rack plug‑in installation

Operating Temperature:‑30℃ ~ +70℃, non‑condensing

Humidity:5%‑95% non‑condensing

Protection Class:IP20

Weight:1.00kg

Dimension:340mm ×216mm ×22mm

Compatible System: Gas‑steam turbine, synchronous generator EX2100 excitation control cabinet

Core Function

Dynamic discharge board for Mark VI and EX2100 excitation system. It executes generator field de‑excitation control, monitors DC‑link over‑voltage and bridge operating temperature. It sends trigger signals to thyristor discharge loop, controls K41 de‑excitation relay to release magnetic field energy rapidly during unit trip or fault occurrence. It communicates with EROC regulator board via VME backplane bus, provides critical over‑voltage protection for generator excitation winding. It supports simplex and TMR triple‑modular redundant architecture, improves safety performance of excitation cabinet under grid disturbance and unit fault conditions.

Product Details

The IS200ERDDH1ABA is ERDD series dynamic discharge board for GE Speedtronic Mark VI and EX2100 excitation control system.

This 6U VME board is installed on ERBP excitation regulator backplane. It collects real‑time DC‑link voltage, field voltage and power bridge temperature signals. When excitation system encounters abnormal over‑voltage or unit trip command, the board outputs thyristor trigger pulse, drives discharge circuit and de‑excitation relay to consume residual magnetic energy of generator field winding, avoiding winding damage caused by over‑voltage. Optical isolation design effectively isolates high‑power field side and low‑voltage control circuit, restraining interference transmission. RTD temperature input realizes real‑time thermal monitoring for power components. On‑board LED status indicators help maintenance staff quickly judge board operating condition and locate over‑temperature, over‑voltage faults. Conformal coated circuit board improves anti‑vibration, moisture‑proof and anti‑electromagnetic‑interference performance, adapts to high‑noise and harsh working environment of power plant excitation cabinet. Widely deployed in simplex and TMR triple‑modular redundant generator excitation cabinets for gas‑steam turbine units.

It belongs to critical de‑excitation protection spare‑part for EX2100 excitation system, widely used in overhaul and renovation projects of power generation units.

It is important spare hardware for excitation de‑excitation loop debugging and defective IS200ERDDH1ABA board replacement.