IS200EDCFG1ACB - Exciter DC Feedback Board

SPECIFICATIONS:

Part Number: IS200EDCFG1ACB
Manufacturer: General Electric
Series: EX2100
Product Type: Exciter DC Feedback Board
Power Requirements: +5 V dc, 6 A
Operating temperature: -30 to +65°C
Size: 30.48cm High x 21.33cm
Repair: 3-7 Day
Fuse for connectors J1R, J1S, J1T: 10 A 250 V
Availability: In Stock
Country of Origin: United States
Manual: GEI-100463

FUNCTIONAL DESCRIPTION:

IS200EDCFG1ACB is an Exciter DC Feedback Board manufactured and designed by General Electric as part of the Series used in GE Excitation Control Systems. The Exciter DC Feedback Board (EDCF) is used in the EX2100 Excitation Control. It measures field current and field voltage at the SCR bridge, and interfaces to the EISB board in the control panel over a high-speed fiber-optic link. The fiber optics provides voltage isolation between the two boards and high noise immunity. Two fibers are used, one for each signal. There are two types of fibers which can be used for different distances, as follows:

• Plastic-type fiber for distances up to 10 m
• Hard clad silica type for distances up to 90 m

FIELD VOLTAGE FEEDBACK:

The field voltage is measured across the negative terminal of the bridge and the positive terminal of the current shunt. After scaling the voltage with the jumpered resistors, the signals are input into a differential amplifier, which controls the voltage-controlled oscillator (VCO).

FIELD CURRENT FEEDBACK:

The field current is measured across a DC shunt at the SCR bridge. This generates a low-level signal, with a maximum value of 500 mV, which is input to a differential amplifier. The output voltage from the amplifier ranges from –5 V to +5 V into a voltage-controlled oscillator.

POWER SUPPLY:

Power is supplied to EDCF from an external ±24 V dc source. From this, three voltage regulators produce +15 V dc, -15 V dc, and + 5 V dc. The PSOK green LED is driven by the ±15 V dc output voltages.

OPERATION:

Voltage and Current Sensing: The Exciter DC Feedback Board constantly monitors the DC voltage and current supplied to the generator's field windings, which is crucial for maintaining the correct level of excitation. It uses precision sensors to measure these parameters accurately, providing real-time data to the control system.

Signal Conditioning: The raw voltage and current signals are often noisy or may have unwanted frequency components. The board processes these signals to filter out noise and convert them into a format suitable for further analysis or control actions.

Automatic Voltage Regulator (AVR) Interface:

The Exciter DC Feedback Board works closely with the AVR, a critical component responsible for maintaining the generator’s output voltage within a specified range. The board feeds the sensed voltage and current data back to the AVR. If the output voltage deviates from the desired setpoint, the AVR adjusts the excitation current accordingly to correct the voltage.

Excitation Control: By controlling the amount of DC excitation current, the board helps regulate the magnetic field in the generator. This control is vital for maintaining the generator's voltage output as the load varies. The board also ensures that the excitation voltage is appropriate to prevent over-excitation, which could lead to overheating, or under-excitation, which might cause the generator to drop out of synchronization with the grid.

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FREQUENTLY ASKED QUESTIONS:

What is the primary function of the Exciter DC Feedback Board?

The primary function of the Exciter DC Feedback Board is to monitor and regulate the DC voltage and current supplied to the generator's field windings. It ensures that the excitation system provides the correct amount of excitation to maintain a stable generator output voltage.

How does the Exciter DC Feedback Board contribute to voltage regulation?

The Exciter DC Feedback Board provides real-time feedback on the excitation voltage and current to the Automatic Voltage Regulator (AVR). If the generator's output voltage deviates from the setpoint, the board helps the AVR adjust the excitation current to bring the voltage back to the desired level.

What happens if the Exciter DC Feedback Board detects an overvoltage or undervoltage condition?

If the board detects an overvoltage or Undervoltage condition, it triggers protective actions such as adjusting the excitation current or, in severe cases, shutting down the excitation system to prevent damage to the generator.