Summary
Rooq's three-phase pad-mounted transformer is offered in a variety of designs and configurations.
The following pages describe the standard designs and the common options that are available.
Some special designs and options may require additional ngineering, factory coordination, unusual application requirements or special manufacturing needs.
Higher impedances limit secondary fault currents such that coordination with secondary low voltage moldedcase circuit breakers is usually possible. (Low impedances are also available if required for paralleling, and so on.)
Standard color is pad-mounted green [Munsell® Green (#7GY3.29/1.5)]. ANSI #24, 61 and 70 are available as options.
Standard
The pad-mounted transformers described in this catalogue are designed and tested in accordance to IEC/BSEN 60076,IEC61330,IEC62271,IEC60721, IEEE C57.12.00 etc.
Features
Common power ratings:
30, 50, 80,100,125,160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000, 2500 kVA.
This transformer is designed for voltages of ≤ 36 kV. Specific figures are not given for this parameter because of the wide variety of voltages used. Transformers can be supplied on demand to run at two different primary voltages, the shift between these input voltages has two
basic alternatives:
• with a primary tap changer which can be switched with no load and no applied voltage
• or by changing terminals under the cover.
The secondary voltage under no load is allocated at 400V, 415V, 433V, though other voltages can be supplied on demand.
When usage requires two voltages, transformers with two simultaneous voltages can be supplied. In this case the no-load voltages are set to 400V(230V),415V(240V),433V(230V) .
As per IEC /BSEN 60076 standards these are
set in accordance with the highest voltage for the material,
being the level immediately above the rated voltage.
| Material maximum admissible voltage |
12kV |
17,5kV |
24kV |
36kV |
| Withstand voltage |
28kV |
38kV |
50kV |
70kV |
| Basic insulation level |
75kV |
95kV |
125kV |
170kV |
Construction details
I-Outside
Four lifting hooks
II-Medium voltage compartment
Bolted-on terminal compartment with removable front sill
Hinged, lift-off cabinet doors
Interlocked hex-head or penta-head bolt padlock handle operates a cam assembly that is part of the three point door latching echanism
Hex-head or penta-head bolts must be removed from the flange formed on the steel high/low barrier before the HV door can be opened-not shown
Removable neutral ground strap
Tank ground pads
Steel high/low voltage compartment barrier
Nameplate
Fill plug and self-actuating
pressure relief device
Externally operated no load
Tap changer
Drain valve and sampling device
III-Low voltage compartment
Main circuit breaker
Current transformer(CT)
Meter
Outgoing feeder
Pictures
Audited Supplier 
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