pad mounted transformer

This afternoon october 25, 2007 Copper Power System visit at Don Ramon Aboitiz substation for giving us a seminar and actual instruction on pad mounted transformer.

3Ø Pad-Mounted Transformers
Ratings
kVA: 45 – 10,000
Primary (High) Voltage: 2400 – 46,000 Volts
Secondary (Low) Voltage: 120 – 15,000 Volts
Oil or Envirotemp® FR3™ Filled
55/65º Rise for 12% More kVA

Installation Location
1. Sufficient Space
2. Sufficient Ventillation
3. Stable Mounting Pad

Pre-Service Inspection
Check the exterior of the transformer Dents, Nicks, Scratches on the bushing
Check all the seals and gaskets seepage Tank cover, bushing seals, gauges, fuses, operating devices, etc..
Check the presence of Vacuum
Check the liquid level


External Connections
Transformer must be connected and operated as indicated by the nameplate
Bushing and terminals must be thoroughly clean prior to connection
Allow sufficient flex for all Cables connected to the transformer terminal

Ground Connections
Transformer tank must be connected to a permanent, low resistance ground.
All CPS padmounted transformers are equipped with two grounding pads

High Voltage Connections
Make connections as shown in the diagrams and info on the transformer nameplate
Transformer Neutral to Systems Neutral
Leads and connections that are not used must be insulated from ground and all other leads
Allow sufficient flex for all Cables connected to the transformer terminal
The bushings are positioned to allow vertical take off of the primary cables entering from below

Deadfront Transformers Connections
All 3 phase padmount transformers are equipped with Universal Bushing wells
One-piece bushings or bushing wells with factory installed inserts
Other brand well inserts must be compatible with the universal bushing well otherwise it will cause premature failure of the transformer.

Low Voltage Connections
Check the information on the transformer nameplate (Voltage, Config., BIL)
Transformer Neutral to Systems Neutral
Allow sufficient flex for all Cables connected to the transformer terminal
Use the sec. bushing support if the cable are heavy enough to pull down the bushing

Accessories
Liquid level gauge
Liquid Temperature Gauge
Pressure Vacuum Gauge
Pressure Relief Device
Bay-O-Net Fuse


Switches and Protective Devices
Refusing of Bay-O-Net Fuse
a. Pull ring of
Pressure Relief
valve


Refusing of BaY-O-Net fuse
*SHUTDOWN CONDITION ONLY
a. Pull the ring of Pressure Relief Valve and hold
b. Using Hot stick twist the fuse holder to unlock
c. Turn fuse holder to 90deg. to break seal bet gasket and fuse housing
d. Draw fuse holder out quickly 8 to 10 in.
e. Wait several sec to drain the oil
f. Remove fuse holder from the Bay O net housing
g. Wipe off catridge holder Refusing of BaY-O-Net fuse
h. Use ¾” wrench to remove fuse catridge from holder
h. Insert Replacement Fuse Link of same catalog into the Fuse Catridge

Internal Loadbreak Switch
Two Position LBS
On/Off Switch function

Internal Loadbreak Switch
Sectionalizing LBS
V-Blade 4 Position Sectionalizing LBS
3Ø Pad-Mounted Transformers
4-Position V-Blade Switch
Internal Loadbreak Switch
Sectionalizing LBS
T-Blade 4 Position Sectionalizing LBS

3Ø Pad-Mounted Transformers
4-Position T-Blade Switch

Tap Changer
Hot Stick Operable TC
Lever Handle TC

3Ø Pad-Mounted Transformers
High Voltage Connectors
For Deadfront
Loadbreak Elbow Connectors

3Ø Pad-Mounted Transformers
High Voltage Connectors
For Deadfront : MOVE Surge Arrester
3Ø Pad-Mounted Transformers
High Voltage Connectors
For Deadfront : TOP II Connector

3Ø Pad-Mounted Transformers
High Voltage Connections
Radial Feed - 3 HV Bushings

3Ø Pad-Mounted Transformers
High Voltage Connections
Loop Feed Means 6 HV Bushings to Loop High Voltage Cables In and Out