This excitation control board manages generator field regulation for GE Mark VIe turbine systems. It executes automatic voltage regulator (AVR) algorithms for stable output control. Therefore, it ensures precise generator terminal voltage under varying load conditions.
Physical and Control Specifications
The GE IS200EMIOH1A IS200EMIOH1ACA measures 26.0 cm in length and 18.5 cm in width. Moreover, its board weight equals approximately 0.70 kg for rack mounting. A single 64-pin male connector links this board to the VME backplane. Additionally, the board integrates sixteen analog inputs and eight digital outputs.
| Parameter | Specification |
|---|---|
| Brand | General Electric (GE) |
| Full Model | IS200EMIOH1A IS200EMIOH1ACA |
| Category | Excitation Control Board |
| Dimensions (L x W) | 26.0 cm x 18.5 cm (10.24″ x 7.28″) |
| Board Weight | 0.70 kg (1.54 lbs) |
| Primary Interface | 1 x 64-pin Male Connector |
| Analog Input Channels | 16 Differential Channels (Voltage/Current) |
| Analog Input Range | 0-10 VDC, -10 to +10 VDC, 0-20 mA, 4-20 mA |
| Analog Input Resolution | 15 Bits (0 to 32767 Counts) |
| Analog Output Channels | 4 Channels (0-10 VDC or 4-20 mA) |
| Analog Output Resolution | 12 Bits (0 to 4095 Counts) |
| Digital Outputs | 8 Channels (24 VDC, 0.5 A Transistor) |
| Control Algorithm | PID + Feedforward + Power System Stabilizer (PSS) |
| Voltage Regulation Accuracy | ±0.25% of Setpoint |
| Response Time (Step Change) | < 20 ms |
| On-Board Components | 1 DSP Processor + 3 ADC Chips + 1 DAC Chip + 4 Memory Chips + 2 UARTs + 8 Output Drivers + 16 Input Optocouplers + 16 Protection Diodes + 1 Temperature Sensor + 1 Voltage Reference IC |
| Energy Storage | 4 x 220 µF Electrolytic Capacitors (35V) + 4 x 10 µF Tantalum (25V) |
| Operating Voltage | +5 VDC, +15 VDC, -15 VDC, and +24 VDC from Backplane |
| Feedback Inputs | 3 Phase Voltages + 3 Phase Currents + DC Field Voltage + DC Field Current |
| Isolation Rating | 2500 Vrms (Analog Inputs to Backplane) |
| Protection Features | Overexcitation + Underexcitation + V/Hz + Overvoltage |
| Operating Temperature | -20°C to +65°C (-4°F to +149°F) |
| Status Indicators | 8 Green LEDs (Output Status) + 1 Green LED (Power) + 1 Red LED (Fault) + 1 Yellow LED (PSS Active) |
Excitation Control and Regulation Features
The GE IS200EMIOH1A IS200EMIOH1ACA executes advanced AVR algorithms for generator control. Specifically, the PID loop maintains terminal voltage within ±0.25 percent of setpoint. In addition, a power system stabilizer (PSS) dampens low-frequency oscillations. Moreover, feedforward compensation improves response speed during load changes. Furthermore, the DSP processor updates control outputs every 5 milliseconds. Consequently, this board provides stable excitation control for large turbine generators.
Analog Feedback and Protection Systems
This excitation board monitors three-phase voltages and currents for regulation. For instance, the 15-bit analog inputs measure generator terminal voltage precisely. In addition, DC field voltage and current feedback close the inner regulation loop. Moreover, built-in protection features include overexcitation and underexcitation limits. Furthermore, V/Hz protection prevents transformer core saturation during overfluxing. Thus, the GE IS200EMIOH1A IS200EMIOH1ACA safeguards both generator and step-up transformer.
Energy Storage and Control Stability
This control board stores energy using eight onboard capacitors for power filtering. Specifically, four electrolytic capacitors smooth the ±15 VDC supplies for analog circuits. In addition, four tantalum capacitors provide high-frequency noise suppression for the DSP. Furthermore, a temperature sensor monitors board ambient for derating purposes. Therefore, this board maintains regulation accuracy during transient power disturbances.
Installation and Diagnostic Indicators
Eleven 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, eight green Output Status LEDs illuminate when each digital output is active. Third, a yellow PSS Active LED lights when the power system stabilizer engages. Finally, a red Fault LED indicates overexcitation, underexcitation, or V/Hz trips. Additionally, the board features six mounting holes for secure rack attachment. Thus, you can monitor excitation control status instantly without external test equipment.
Details
| Weight | 0.1 kg |
|---|---|
| Dimensions | 25 × 108 × 127 mm |
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