GE IS200TGENH1A

IS200TGENH1A is a Terminal Board Generator Monitor developed by GE under the Mark VI series. The Generator Monitor (TGEN) terminal board communicates with the VGEN processor to monitor the three-phase voltage and currents of the generator, as well as to calculate the three-phase power and power factor.

VGEN provides the PLU and EVA capabilities for large steam turbine applications by utilizing fast-acting solenoids situated on the TRLY terminal board. The TGEN in the Mark VI system collaborates with the VGEN processor and supports simplex and TMR applications. A single cable links one TGEN to the VGEN. TGEN connects to three VGEN boards through three distinct wires in TMR systems.

IS200TGENH1A Operation

TGEN's two- and three-phase PT inputs, as well as three- and one-phase current transformer CT inputs, are monitored by VGEN. Four analog inputs can be adjusted for 4-20 mA or 5, 10, 20 V dc using jumpers. The phase of the input signals is checked using test points on the generator and bus voltages and currents. VGEN converts signals and calculates power, power factor, and frequency.
To verify the phase in the field, test points are provided for all PT and CT inputs. Three single-phase CT inputs with a continuous normal current range of 0 to 5 A are provided. TGEN's CTs are magnetically isolated. CT terminations are non-pluggable terminal blocks with captive lugs that accept wires up to #10 AWG.
The four analog inputs can accept 4-20 mA or 5-10 V dc signals. A +24 V dc source is available for all four circuits, each with its own current limit. The 4-20 mA transducer can be connected to either the turbine control's +24 V dc source or as a self-powered source.

Installation

Terminal block 1 is wired with analog current and potential transformer (PT) inputs. The current transformer (CT) is connected to special terminal blocks TB2, 3, and 4, which are not removable. This safeguards against an open CT circuit. J1A and J1B set the desired input current or voltage on analog inputs 1–4.

IS200TGENH1A Characteristics

Inputs to VGEN and TGEN
Two 3-phase generators and bus PTs
Three 1-phase generators CTs
Four analog inputs


Generator and bus voltages
115 V RMS nominal
The nominal frequency is 50/60 Hz.
Magnetic isolation of up to 1,500 V RMS (loading less than 3 VA)
Less than 3 VA of input loading per circuit


Generator current inputs
The normal current range is 0 to 5 A, with an over-range of up to 10 A.
The nominal frequency is 50/60 Hz, while the frequency range of interest is 45 to 66 Hz.
Magnetic isolation of up to 1,500 V RMS
Less than 0.5 input load per circuit


Physical Characteristics
Weight: 4.00 lbs
Dimensions: 15.00 x 9.00 x 3.00


Diagnostics

Diagnostics check the input signal for a high/low (hardware) limit and a high/low system (software) limit.
The software limit check can be changed in the field. Voltage inputs have open wire detection, and relay drivers and coil currents are monitored. The terminal board's connectors JR1, JS1, and JT1 each have their own ID device that is interrogated by the I/O board.
The ID device is a read-only chip that contains the serial number, board type, revision number, and plug location of the terminal board.


Configuration

Jumpers are used to configure the terminal board. The available jumpers are as follows:

Jumpers J1A–J4A select either current or voltage input.
Jumpers J1B–J4B determine whether the return is connected to common or left open.