Product Outline
| IS210SCSAS1A is an Exciter Ground Detector Module manufactured and designed by General Electric as part of the EX2100 Series used in Excitation Control Systems. It mounts in the Exciter Power Backplane rack as a double slot, double height (6U) form factor board (EPBP). The field ground detector measures the resistance in the field between any point in the field circuit of the generator and the ground, whether it is on the AC or DC side. A redundant system will have three EGDMs, but a simplex system will have one. Figure 1 displays the position of the EGDM(s). In order to communicate with the EGDM(s), EXAM, the attenuator module, measures the voltage across the ground sensing resistor. The High Voltage Module, which is housed in the Auxiliary Panel, has the EXAM module mounted in it. |
Technical Data
| Part Number: IS210SCSAS1A Manufacturer: General Electric Series: EX2100 Product Type: Exciter Ground Detector Module Operating Temperature: -30 to 65 °C Country of Origin: USA Configuration: Controller (C), Master 1 (M1), Master 2 (M2) redundant EGDM setup Setup Control: Program pins on P2 connector configure each EGDM Communication: DSPX communicates with EGDM C via EISB in controller rack Driver Selection: Controller selects M1 or M2 to deliver signal to sensing resistor in Attenuator Module Relay Control: Controller powers or disables relay in Attenuator Module via fiber-optic link Master Identification: Differential signal sent simultaneously to M1 and M2 Test Command Source: Selected by differential signal on each module Signal Generator: Activated on active master (M1, M2, or C) Oscillator Signal: Received from DSPX via EISB through fiber-optic link Output Signal: Converted to ±50 V square wave signal Sense Resistor Input: Square wave applied to sense resistor through cable to EXAM module Attenuation Ratio: 10:1 differential attenuation from EXAM sense resistor Signal Conditioning: Unity-gain differential amplifier with high common-mode rejection A/D Conversion: Voltage Controlled Oscillator (VCO) converter Data Transmission: Fiber-optic transmitter driven by VCO Power Isolation: Signal conditioner powered by isolated supply for safety Ground Detection: Signal conditioner grounds bridge side of attenuated sense resistor for measurement Power Amplifier Control: Output level determined from grounded measurement signal |
EGDM and Attenuator Module Mounting
| The trio of EGDM boards is set up as Controller (C), Master 1 (M1), and Master 2 (M2) in a redundant control (M2). A group of program pins on the P2 connector control each EGDM’s setup. The DSPX transmits data to EGDM C via the EISB in the controller rack about which the master delivers the driving signal to the sensing resistor in the Attenuator Module. When C receives this data through the fiber-optic link, depending on whether M2 is the selected driver or M1 is the selected master, C either powers or empowers the relay in the Attenuator Module. A differential signal that identifies the selected master is simultaneously transmitted to M1 and M2.
This signal selects the test command source on each module and activates the signal generator on the active master (M1, M2, and C). The active master now gets an oscillator signal from the DSPX via the EISB across the fiber optic link, which it transforms into a positive or negative 50-volt signal. This square wave voltage is applied to one end of the sense resistor after being transmitted via cable to the EXAM module. |
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