GE DS200FHVAG1A High-voltage Gate Interface Board

Part Number: DS200FHVAG1A.

Product Type: High-voltage gate interface board.

Series: LCI.

Origin: United States.

The module has widths of 3.25 inches and 5 inches and does not require an external power supply.

It can operate in an ambient temperature range of 32°F - 122°F (0°C - 50°C) plus a cabinet temperature rise of 18°F (10°C).

Provides an isolated gate power path from the Gate Pulse Amplifier (FGPA) board to a 77mm thyristor, ensuring stable and reliable signal transmission.

When the voltage drop across the thyristor exceeds a certain threshold, it sends a signal to the FGPA board, allowing the system to promptly obtain the thyristor's operating status information for corresponding adjustments and control.

When thyristor blocking voltage exists, the LED on the board lights up to indicate the presence of unit voltage, enabling operators to intuitively understand the module's working status.

Adopts a toroidal current transformer (CT) as the gate pulse transformer, with the single-turn primary wire on the board passing through a hole on the board and positioned at the center of the CT window. This design enables the CT to withstand the electrostatic corona around power cabling, featuring good anti-interference capability.

Rectifies the output of the gate transformer, provides sufficient load resistance to ensure good noise immunity, and connects to the thyristor gate pin to guarantee the quality of the gate signal.

Determines whether the thyristor is in the off mode by detecting the current in the 10kΩ balancing resistor connected in parallel with the thyristor. Meanwhile, the relevant status circuit also lights up a red LED labeled "C STAT" to indicate the presence of blocking voltage. When the bridge power is turned on, this LED should be visible, and its brightness will slightly dim as the thyristor conduction angle increases.

The board provides an isolated gate power path from the FGPA board to a 77mm thyristor. This design ensures that the drive signal generated by the FGPA board is stably and reliably transmitted to the SCR gate, providing the necessary energy support for the SCR to turn on and off, and ensuring it works normally according to control requirements.

When the voltage drop across the SCR exceeds a certain threshold, the DS200FHVAG1A board sends a signal to the FGPA board. This is because the voltage drop across the SCR changes when it works normally or abnormally. By monitoring this voltage drop, the real-time working status of the SCR can be understood. Once the voltage drop is abnormal, it indicates that the SCR may have a fault or be working in an unexpected state. At this time, feedback the signal to the FGPA board, which can take corresponding measures, such as adjusting the drive signal, to ensure the stable operation of the system.

When thyristor blocking voltage exists, the LED on the board lights up. This is because when the SCR is in the blocking state, a specific circuit in the circuit detects this state and converts it into an electrical signal to drive the LED to emit light, thereby intuitively indicating the presence of unit voltage to the operator and facilitating the operator to grasp the working status of the SCR in real time.

Adopts a toroidal current transformer (CT) as the gate pulse transformer, and the single-turn primary wire on the board can be positioned at the center of the CT window through a hole on the board. This structural design enables the CT to withstand the electrostatic corona around power cabling. In high-voltage environments, power cabling often generates interference sources such as electrostatic corona, and this design can effectively reduce the impact of these interferences on the gate pulse signal, ensuring the accuracy and stability of signal transmission, and thus ensuring that the SCR can receive the correct drive signal and work normally.

The gate terminal circuit rectifies the output of the gate transformer, converting the AC signal into a DC signal, and provides sufficient load resistance. The purpose of this is to ensure good noise immunity. In actual industrial environments, there are various interference factors such as electromagnetic noise. By providing appropriate load resistance, the anti-interference capability of the circuit can be enhanced, making the signal reaching the SCR gate pin purer and avoiding situations such as SCR misoperation caused by noise interference.

Determines whether the thyristor is in the off mode by detecting the current in the 10kΩ balancing resistor connected in parallel with the thyristor. Since the current in the balancing resistor connected in parallel with the thyristor differs significantly when the thyristor is in the off and on states, the working state of the thyristor can be judged by detecting the current in this resistor. At the same time, the relevant status circuit will also light up a red LED labeled "C STAT" according to the detection result to indicate the presence of blocking voltage, facilitating observation and judgment by operators.

It is particularly widely used in power plants using gas turbines. As part of GE's LS2100 static start control series products, it can serve as a component of the gas turbine control system, providing SCR (silicon controlled rectifier) gate interface and unit voltage monitoring functions for the LCI (load commutated inverter) power converter, ensuring the stable operation of the generator's excitation system and other related parts, thereby guaranteeing the stable output of electric power.

Some large industrial production equipment may use gas turbines, etc., as power sources or backup power supplies. This module can provide support for the relevant control systems of these equipment, ensuring that links such as power conversion can work stably during equipment operation, and can coordinate with other automation control equipment to achieve precise control of the entire production process.

In energy management systems that need to monitor and manage high-voltage power equipment, DS200FHVAG1A can real-time feedback relevant information such as voltage and thyristor status, helping the energy management system better understand the equipment operation status, thereby reasonably allocating and managing energy and improving energy utilization efficiency.