The GE IS200AEPAH1BKE and GE IS215WEPAH2BB are high-voltage Excitation Power Attenuation (AEPA / WEPA) boards manufactured by General Electric. Deployed in EX2100 / EX2100e Excitation Control Systems integrated with Speedtronic Mark VI and Mark VIe turbine control platforms, these boards step down high AC/DC generator voltages into safe, low-level signal ranges for processing electronics.
While the IS200AEPAH1BKE (AEPA) represents the legacy EX2100 / Mark VI hardware generation, the IS215WEPAH2BB (WEPA) is the enhanced EX2100e / Mark VIe generation equivalent.
Technical Specifications
| Parameter | IS200AEPAH1BKE (AEPA) | IS215WEPAH2BB (WEPA) |
| Manufacturer | General Electric (GE Power / GE Vernova) | General Electric (GE Power / GE Vernova) |
| System Platform | EX2100 / Mark VI Control System | EX2100e / Mark VIe Control System |
| Board Acronym | AEPA (Excitation Power Attenuator) | WEPA (Excitation Power Attenuator) |
| Primary Function | High-voltage sensing & signal attenuation | High-voltage sensing & signal attenuation |
| Input Voltage Range | Up to 1500 V DC / 1000 V AC nominal bus | Up to 1500 V DC / 1000 V AC nominal bus |
| Output Signal Level | Low-voltage differential analog (\pm 10 V range) | Low-voltage differential analog (\pm 10 V range) |
| Dielectric Isolation | Up to 3.0 kV AC / 4.2 kV DC insulation | Up to 3.0 kV AC / 4.2 kV DC insulation |
| Operating Temperature | -30°C to +65°C (-22°F to +149°F) | -30°C to +65°C (-22°F to +149°F) |
| Mounting / Enclosure | Subrack / DIN-rail mounting frame | DIN-rail / cabinet-mounted carrier frame |
Core Features & Operating Capabilities
- High-Voltage Attenuation Network: Uses precision high-impedance resistor networks to step down raw generator field voltages (up to 1500 V DC) and AC exciter bus voltages down to millivolt or 0–10 V DC levels.
- Galvanic & Dielectric Protection: Isolates low-voltage processing cards (such as the AEBI, WEBI, or Mark VI/VIe controllers) from damaging high-voltage surges, lightning strikes, or flashover faults occurring on the exciter power bus.
- Generator Field Ground Detection: Works with field ground detection subroutines to sense insulation breakdown between the rotating generator field winding and ground.
- Voltage & Current Feedback Measurement: Provides clean, noise-filtered feedback signals to the closed-loop automatic voltage regulator (AVR) for continuous excitation current and terminal voltage regulation.
- Diagnostic Sensing: Onboard voltage divider circuits enable the central controller to perform continuous diagnostic self-checks on voltage balance, sensor linearity, and attenuator rail health.
Hardware Generation Comparison
- IS200AEPAH1BKE (AEPA): Designed for standard EX2100 excitation panels and Mark VI VME-bus subracks. Connects via multi-conductor ribbon cabling to AEBI/AICI interface boards.
- IS215WEPAH2BB (WEPA): Upgraded version designed for EX2100e / Mark VIe architectures. Features improved transient suppression, tighter resistor tolerances, and simplified interface cabling for modern Mark VIe I/O packs.
Related GE EX2100 & Mark VI / Mark VIe Components
- IS200AEBIH1A / IS215WEBIH1A — Excitation Bridge Interface Boards.
- IS200AICIH1A / IS215WEICIH1A — Excitation Contact Input/Output Boards.
- IS220UCSAH1A / IS200VCMOH1B — Mark VIe / Mark VI System Controllers.
- IS200EGDMH1A — Field Ground Detection Module.
