This de-excitation control board manages field discharge functions for GE Mark VIe generator systems. It rapidly removes excitation energy during fault conditions or shutdown commands. Therefore, it protects generator windings from overvoltage damage during emergency stops.
Physical and Control Specifications
The GE IS200EDEXG1B IS200EDEXG1BBB measures 26.0 cm in length and 18.5 cm in width. Moreover, its board weight equals approximately 0.72 kg for rack mounting. A single 64-pin male connector links this board to the VME backplane. Additionally, the board integrates six independent de-excitation control channels.
| Parameter | Specification |
|---|---|
| Brand | General Electric (GE) |
| Full Model | IS200EDEXG1B IS200EDEXG1BBB |
| Category | De-Excitation Control Board |
| Dimensions (L x W) | 26.0 cm x 18.5 cm (10.24″ x 7.28″) |
| Board Weight | 0.72 kg (1.59 lbs) |
| Primary Interface | 1 x 64-pin Male Connector |
| De-Excitation Channels | 6 Independent Channels (3 Phase Pairs) |
| Control Signal Type | PWM (Pulse Width Modulated), 0-10 VDC |
| Switching Frequency | 1.5 kHz to 8 kHz (Software Configurable) |
| Maximum Discharge Current | 100 A per Channel (Peak) |
| Discharge Energy Capacity | 500 Joules per Channel |
| Response Time (Fault to Discharge) | < 1 ms |
| On-Board Components | 6 Gate Driver ICs + 12 Protection Diodes + 3 Current Sensors + 1 Temperature Monitor IC + 6 Discharge Resistors (10Ω, 50W) |
| Energy Storage | 6 x 470 µF Electrolytic Capacitors (450V DC) + 2 x 100 µF Tantalum (25V) |
| Operating Voltage | +5 VDC, +15 VDC, -15 VDC, and +24 VDC from Backplane |
| Discharge Voltage Monitoring | Yes (Per Channel, 0-1000 VDC Range) |
| Isolation Rating | 2500 Vrms (Control to Discharge Circuits) |
| Operating Temperature | -20°C to +65°C (-4°F to +149°F) |
| Status Indicators | 6 Green LEDs (Channel Ready) + 6 Red LEDs (Discharge Active) + 1 Green LED (Power) + 1 Red LED (Fault) |
De-Excitation Operation and Discharge Control
The GE IS200EDEXG1B IS200EDEXG1BBB rapidly discharges generator field energy during fault events. Specifically, each channel activates within 1 millisecond of receiving a trip command. In addition, dedicated discharge resistors convert stored magnetic energy into heat safely. Moreover, the board monitors discharge current and voltage for each channel independently. Consequently, this board protects generator insulation from destructive overvoltages during emergency stops.
High-Voltage Energy Storage and Discharge
This de-excitation board stores significant energy using six high-voltage electrolytic capacitors. Specifically, each capacitor handles up to 450 volts DC of field energy. In addition, each channel discharges up to 500 joules of stored magnetic energy. Furthermore, the discharge resistors dissipate this energy without damaging nearby components. Thus, the board safely removes excitation from large generator fields within milliseconds.
Gate Driver and Protection Features
Six gate driver circuits control the discharge IGBTs for each channel. For instance, each driver includes desaturation detection for short-circuit protection. In addition, the board monitors internal temperature to prevent overheating during repeated discharges. Moreover, individual channel status LEDs show readiness and discharge activation states. Therefore, the GE IS200EDEXG1B IS200EDEXG1BBB operates reliably under demanding generator fault conditions.
Installation and Diagnostic Indicators
Fourteen LED indicators provide operational status at a glance on this board. First, a green Power LED lights when the backplane supply voltages are present. Second, six green Channel Ready LEDs illuminate when each channel is armed and functional. Third, six red Discharge Active LEDs flash during a de-excitation event. Finally, a red Fault LED indicates over-temperature or discharge circuit failures. Additionally, the board features six mounting holes for secure rack attachment. Thus, you can monitor de-excitation status instantly without external test equipment.
Details
| Weight | 0.1 kg |
|---|---|
| Dimensions | 25 × 108 × 127 mm |
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