PRINTABLE VERSION
Technical Bulletin # 217
PROCEDURE FOR REMOVING S-PACK MODULE
Tools Required:
- 9/16" Wrench
- 11/16" Wrench
Safety Precautions:
1. PRIOR TO PERFORMING THIS PROCEDURE, MAKE SURE THE T/R SET IS DE-ENERGIZED AND LOCKED OUT USING THE PROPER INTERLOCK SEQUENCE.
2. MAKE A SEPARATE SOLID GROUND CONNECTION MUST TO THE HIGH VOLTAGE BUS CONDUCTOR THAT FEEDS THE PRECIPITATOR. IF A SEPARATE EXTERNAL GROUND CONNECTION IS NOT MADE, LETHAL VOLTAGES MAY EXIST WITHIN THE T/R SET.
Other Precautions:
1. Make sure that the lid of the T/R set and other surfaces are clean of dirt, flyash, water or other contaminants prior to opening the T/R set. Once the lid is removed, take care not to introduce any contaminants into the dielectric fluid.
2. It is NOT necessary to drain the dielectric fluid to perform this test. Draining the fluid will only cause other problems. This procedure was intended to be performed with the fluid at the operating level. If there are any questions concerning the type of fluid in the T/R set, check the dielectric nameplate on the side of the tank. Material Safety Data Sheets (MSDS) for all our dielectric fluids can be found under the Resources Tab at www.nwl.com.
Procedure:
1. Using a 9/16" wrench, remove the cover clamps on the lid of the T/R set. When all the clamps are off, remove the lid.
2. Remove all of the electrical connections to the S-Pack. Refer to the diagram below. The connections are as follow:
- High Voltage Bushing connection: One BNC connector located at the back of the S-Pack near the air core reactor (ACR). Twist BNC connector to remove.
- High Voltage Transformer connection: Two BNC connectors located on the front printed circuit board of the S-Pack.
- Feedback connection: Locate the quick disconnect plug located near the back corner of the S-Pack. Press the release tabs on each end of the plug and pull.
3. Using an 11/16" wrench remove the mounting nuts and hardware from the studs that secure the S-Pack to the top of the transformer core.
4. Pull the S-Pack up and out of the tank.
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