IS220PGDMH1A - Ground Detector I/O Pack

SPECIFICATIONS

Part Number: IS220PGDMH1A
Manufacturer: General Electric
Series: Mark VIe
Function: Ground Detector I/O Pack
Availability: In Stock
Country of Manufacture: United States (USA)

Functional Description

IS220PGDMH1A is a ground detector I/O pack developed by General Electric. It is a part of GE Mark VIe system. The Standalone Digital Ground Detector (PGDM) is a module designed to detect ground faults in electrical systems, particularly in excitation systems and generator fields. It can be used in both replacement applications and new installations, such as when a second ground detection system is needed for enhanced reliability and safety. The PGDM shares many features with the integral EGDM (Exciter Ground Detector Module) but is capable of functioning as a standalone unit.

Applications

• It is suitable for replacing existing ground detection modules in older systems, providing a modern, digital solution with enhanced detection capabilities.
• In new systems, particularly in regulators, the PGDM can be installed as a secondary ground detection system to ensure redundancy, increasing the safety and reliability of electrical field circuits.

Leakage Resistance Detection

One of the primary functions of the PGDM is the detection of leakage resistance to ground. This refers to identifying any unintentional electrical connections (grounds) between the field circuit and the earth. The PGDM can detect grounds at any point in the field circuit, including:

• The AC secondary windings of the input transformer
• The excitation system, responsible for controlling the voltage applied to the generator's field windings
• The exciter or generator field which includes the field windings responsible for generating the magnetic field in the generator.
• By monitoring these points, the PGDM ensures that any insulation breakdowns or ground faults are quickly detected, minimizing potential hazards and equipment damage.

Ground Detection When Exciter is Inactive

• A significant advantage of the PGDM is its ability to detect grounds even when the exciter is not running. In many traditional systems, ground detection is only possible when the exciter is operational, meaning that faults occurring during downtime or maintenance might go unnoticed.
• The PGDM, however, offers continuous monitoring, ensuring that ground faults are identified as soon as they occur, regardless of whether the system is active.

Constant Sensitivity to Grounds

• Whether the exciter or generator field is operating at high or low voltages, the PGDM can accurately detect grounds.
• The module’s sensitivity remains constant, unaffected by changes in voltage levels, ensuring reliable detection under all operating conditions.

Ground Location Independence

• The PGDM can detect grounds anywhere in the exciter or generator field, including locations that might be difficult to monitor in traditional systems.
• This comprehensive detection ensures that faults are identified promptly, minimizing potential risks to the system’s integrity.
• The PGDM shares many features with the integral EGDM detector, making it a strong option for systems already familiar with the EGDM’s capabilities. However, the PGDM stands out due to its standalone nature, making it suitable for installations where a dedicated ground detection module is needed, either as a replacement or for new configurations.

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FREQUENTLY ASKED QUESTIONS

What is IS220PGDMH1A?
It is a ground detector I/O pack developed by General Electric.

Can the module detect ground faults when the exciter is not running?
Yes, one of the major advantages of the PGDM is its ability to detect grounds even when the exciter is inactive. This ensures constant monitoring of the system, allowing for the detection of ground faults during downtime or maintenance periods.

Does the module maintain constant sensitivity regardless of voltage?
Yes, the module maintains constant sensitivity to ground faults, regardless of the operating voltage of the exciter or generator field. This ensures reliable detection under both high and low voltage conditions.

Does the module detect grounds based on their location in the system?
No, the module can detect grounds without regard to their location in the exciter or generator field. This means that it can identify faults regardless of their location, providing comprehensive ground fault detection.