GE IS200EPSMG2A Exciter Power Supply Module

GE IS200EPSMG2A Exciter Power Supply Module

Part Number IS200EPSMG2A Manufacturer General Electric Country of Manufacture As Per GE Manufacturing Policy Series EX 2100e Function Module Availability In StockIS200EPSMG2A is an Exciter Power Supply Module part of the GE Mark VI series used in Excitation control systems. This series is a later version of General Electric's Speedtronic steam or gas turbine management system. The Mark VI features Ethernet capabilities and a PC-based operator interface that runs on the Windows operating system. All digital and analog data in the Mark VI can be accessed through this HMI (human-machine interface). 

The HMI, however, is a non-essential component of the control system, thus it can be changed or reinitialized without affecting the control system. The EPSM card is available in two versions for the Mark VI. The first (EPSMG1) is used in the thyristor system, while the second (EPSMG2) is employed in the regulator control. The IS200EPSMG2A is similar to the EPSMG1 board, except it has a daughterboard built-in (EPSD.) It transforms DC link voltages into the various voltages needed by the EX2100 regulator control system. 

Two of these boards will be used in redundant systems, one in the Exciter Regulator Backplane and the other in the Exciter Regulator Redundant Backplane. One board is required for simplex systems. It provides +5 V DC, +/- 15 V DC, and +24 V DC voltages. The primary board features two inductors, one of which is a big Bicron inductor. It contains five heat sink-equipped transistors, four additional heat sinks, nine fuses, a transformer, and many high-voltage electrolytic capacitors.

SPECIFICATIONS:

Part Number: IS200EPSMG2A
Manufacturer: General Electric
Series: EX2100
Product Type: Exciter Power Supply Module
Repair: 3-7 Day
Weight: 2 lbs
Size: 15.9 cm high x 17.8 cm
Operating Temperature: -30 to +65°C
Country of Origin: United States
Availability: In Stock
Manual: GEI-100462A

FUNCTIONAL DESCRIPTION:

IS200EPSMG2A is an Exciter Power Supply Module Manufactured and designed by General Electric as part of the EX2100 Series used in the GE Excitation Turbine Control System and the EX2100 Regulator Control. EPSM Group 1 modules (EPSMG1) are used in the excitation control system and EPSM Group 2 modules (EPSMG2) are used in the regulator control. EPSMG2 includes an IS200EPSDG_A Exciter Regulator Power Supply Daughter board (EPSD) mounted to it. The EPSM is comprised of 2 major sections, a buck regulator and a push-pull inverter. The buck-regulator converts the input voltage to a 50 V dc intermediate voltage. This intermediate voltage is then applied to a push-pull inverter to create the required multiple output voltages. The transformer used in the push-pull inverter provides high-voltage isolation between the input voltage source and the output supplied to the control system.

EX2100 EXCITATION CONTROL SYSTEM APPLICATION:

EPSMG1 converts 125 V dc from the power distribution module (PDM) into the voltages required for the EX2100 excitation control. Three independent EPSMG1s supply power to each of the controllers M1, M2, and C. They are mounted in the IS200EPBPG_A Exciter Power Backplane (EPBP) located below the IS200EBKPG_A Exciter Backplane (EBKP) in the control cabinet. Connectors P1 and P2 carry power from the EPSMG1 to EPBP for cables to EBKP and other boards. The EPSMG1 supplies +5 V dc, ±15 V dc, and +24 V dc to the control assembly backplane. Power is also supplied to external modules as follows:

±24 V dc to power the fans, de-excitation module, crowbar module, ground detector module, and field voltage/current module.

Isolated +70 V dc for contact wetting to the terminal boards.

EX2100 REGULATOR CONTROL APPLICATION:

EPSMG2 converts the dc link bus voltage into the voltages required for the EX2100 regulator control. In simplex systems, one EPSMG2 is mounted in the IS200ERBPH_A Exciter Regulator Backplane (ERBP). In redundant systems, one EPSMG2 is mounted in ERBP (M1) and a second EPSMG2 is mounted in the IS200ERRBH_A Exciter Regulator Redundant Backplane (ERRB, M2/C). The EPSD that is mounted on EPSMG2 modifies the power input path to allow EPSMG2 to accept higher voltages by increasing the creep and clearance. It also provides a fuse between the regulator power source (DC link) and the buck regulator. The EPSMG2 supplies +5 V dc, ±15 V dc, and +24 V dc to the ERBP and ERRB. Power is also supplied to external modules as follows:

±24 V dc (P24B/N24B) to power fans, relays, and the dc feedback board

Isolated +70 V dc (P70) for contact-wetting on the terminal board, dynamic discharge board, and redundant relay board

Isolated 20 V ac (AC17) to power the IGBT gate and dynamic discharge board

±55 V dc (P55/N55) to the ground detector circuits on the options card