GE IS200ERGTH1A IS200ERGTH1APR1 | Ground Detector Board

Continuous Ground Fault Monitoring for Exciter Circuits

The GE IS200ERGTH1A IS200ERGTH1APR1 detects ground faults in ungrounded exciter systems. This detector board belongs to the Mark VI series from General Electric. It monitors both positive and negative DC buses continuously. Therefore, it provides early warning before a second fault causes damage.

Physical Dimensions and Rack Mounting Details

This ground detector board measures 16 cm in width, 12 cm in height, and 2.5 cm in depth. The GE IS200ERGTH1A IS200ERGTH1APR1 weighs approximately 0.24 kg, which supports easy rack installation. Its compact single-board design fits into any standard Mark VI slot. Consequently, you can add it without removing adjacent boards.

Connector Layout and Component Configuration

The GE IS200ERGTH1A IS200ERGTH1APR1 features one 34-pin backplane connector for power and signal. It also provides two 6-pin test ports for calibration access. This board contains four precision voltage dividers for bus monitoring. Additionally, it includes eight filtering capacitors for noise immunity.

Technical Parameter	Specification
Full Model Name	GE IS200ERGTH1A IS200ERGTH1APR1
Manufacturer	General Electric (GE)
Series	Mark VI / EX2100
Product Category	Ground Detector Board
Weight	0.24 kg (0.53 lbs)
Dimensions (W x H x D)	160 mm x 120 mm x 25 mm
Backplane Connector	1 x 34-pin header
Test Ports	2 x 6-pin
Precision Voltage Dividers	4 units
Filtering Capacitors	8 units (100 µF each)
Total Capacitance	800 µF
Monitoring Voltage Range	0–600 VDC
Ground Fault Sensitivity	10 kΩ to 100 kΩ
Response Time	50 ms typical
Operating Temperature	–20°C to +65°C

Energy Storage and Noise Filtering Performance

The GE IS200ERGTH1A IS200ERGTH1APR1 stores minimal energy for signal stability. Its eight capacitors provide 800 µF of total capacitance. This storage filters out switching noise from the exciter buses. As a result, the board avoids false ground fault alarms during normal operation.

Role Within the EX2100 Excitation System

You will typically find the GE IS200ERGTH1A IS200ERGTH1APR1 in a dedicated monitoring slot. It connects directly to the positive and negative exciter buses. Moreover, this board works with both brushed and brushless exciter configurations. Its adjustable sensitivity allows matching to different system impedances.

Installation and Calibration Guidelines

Use the GE IS200ERGTH1A IS200ERGTH1APR1 as a direct replacement for older ERGT revisions. Always verify that the exciter buses are de-energized before installation. This detector board requires no external power supply for operation. It draws all necessary power from the backplane connector. Simply secure the board with its ejector tabs and perform a calibration check through the test ports.