Installing the Generator Field Monitoring System (EZDP-2104)

Related Products:

EAMA-001, EAMA-003, EAMA-005, EGSA-013, EGSA-015, EGSA-210, EGSA-220, EGSA-310, EGSA-320

Related Documents:

EZDP-2104

Type:

Installation

Keywords/Labels:

installing, mounting, cable connections, rotor flux

Summary:

This document describes the installation of the Generator Field Monitoring System.

Installation

This section describes the installation of the Generator Field Monitoring System. Before beginning the installation, thoroughly review the Generator Field Monitoring System Installation Planning Guide (EZDP-2105).

 

Placement and Mounting of Enclosure

This section covers the placement and mounting requirements for the Generator Field Monitoring System enclosure.  

The Generator Field Monitoring System (A) requires two strut channels (B) for mounting. The enclosure should be mounted at the drive end of the generator and as close to the Shaft Grounding Assembly as possible to minimize the run length of the signal cables, while:

  • Maintaining operator safety

  • Meeting the requirements outlined in the Installation Planning Guide (EZDP-2105)

Placement-of-Enclosure-01.svg
 

Routing the Signal Cables from the Shaft Assemblies

This section covers the requirements relating to the routing and termination of the Shaft Grounding Assembly (SGA) and Shaft Contact Assembly (SCA) signal cables.

  1. Route the supplied Ethernet signal cables (D) from the SGA junction box (C) attached to the SGA cable whip (A) through conduit to the monitoring system and make terminations according to the associated wiring diagram(s).

  2. Route the supplied Ethernet signal cable from the SCA (E) through conduit to the monitoring system and make terminations according to the associated wiring diagram(s).

  3. Drill and tap a 5/16”-18 hole in the unit case near the SGA Junction Box (C) for the ground wire connection.

  4. Route the 8 AWG ground wire (B) from the Junction Box (C) to unit case ground.

  5. Verify that the ground wire termination point will maintain proper electrical connection. Remove any paint, rust, or other, contaminants from the location of the 5/16”-18 hole.

Routing-Signal-Cables-From-Shaft-Assemblies.svg
 

Routing the Signal Cable from the Rotor Flux Probe

This section covers the requirements relating to the routing and termination of the rotor flux signal cable (A).  

The location of the rotor flux probe may vary from generator to generator. Cutsforth will rely on the plant to locate the rotor flux probe and/or its signal pick-up point. It is recommended that the total length of the rotor flux signal cables (A), from the rotor flux probe to the Generator Field Monitoring System, be kept at or below 100 ft.  

For the rotor flux signal cable (A), Cutsforth recommends an 18 AWG shielded, twisted pair cable with a drain wire. The procurement of this cable and its connectors to fit the flux probe are the responsibility of the plant’s electrical contractor.

Routing-Signal-Cables-From-RotorFluxProbe.svg
 

Running Plant Power and Data Connections

This section covers the power requirements and data connections for the Generator Field Monitoring System.  

The Generator Field Monitoring System has an internal enclosed AC/DC converter which requires a power input of 85-264 V and 5 A AC at 50 or 60 Hz. The output of the internal power supply is 24V, 5A DC (120W). The power input cabling (A) should be run to the Generator Field Monitoring System in weather-proof conduit.  

Cutsforth recommends a CAT6a cable for the data output from the Generator Field Monitoring System to the control room (B). The data output cabling should be run to the control room in liquid-tight conduit.

Where flexible conduit is used, Cutsforth recommends the use of type HCX high-temp flexible metallic conduit (LFMC).

RunningPlantPowerDataConnections.svg
 

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