TS
P OW
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stelmec
beyond
boundaries
INDOOR
INSTRUMENT TRANSFORMERs
Indigenously designed indoor resin cast instrument
transformers generally conforming to IS 2705-1992,
IS 3156-1992 & IEC 61869-2012 in the medium voltage
range of 3.6kV to 36kV guarantee reliable service,
ensure functional excellence & safety.
Applications
• For Measuring & Protection in the electrical
transmission and distribution systems.
Salient Features
• Compact Design – Fully encapsulated one piece
•
•
•
•
•
epoxy resin insulation
High Electrical and Mechanical strengths
Non-hygroscopic
No fire risk
Maintenance free
Fully type tested as per IS 2705-1992 (Part I to IV)
for CTs & IS 3156 – 1992 (Part I to IV) for VTs
stelmec
INDOOR INSTRUMENT TRANSFORMERs
beyond
boundaries
One stop solution for reliable measurements & protection needs
Resin cast indoor instrument transformers-both Current Transformers (CTs) & Voltage Transformers (VTs)-in the
medium voltage range from 3.6kV to 36kV manufactured guarantee reliable service, ensure functional excellence & safety.
Technical Specifications
Current Transformers
Details
Voltage Transformers
Units
Parameters
Rated Voltage
kV
3.6, 7.2, 12, 24 & 36
Rated primary current
A
Up to 3000
Rated secondary current
A
Rated burden
Units
Parameters
Rated Voltage
kV
3.6, 7.2, 12, 24 & 36
Secondary Voltage
V
110/√3
5/1
Voltage factor
-
1.2 continuous
VA
5 to 20
Rated burden
VA
Up to 100
Accuracy class
-
0.2S to 1.0
Accuracy class
-
0.2 to 1.0
Instrument security factor
-
<5
kA
3 to 44
s
3
Short time current
Duration
Details
Manufacturing Process
These transformers are manufactured under strict supervision of
International standards.
trained & experienced personnel, utilizing latest technology for
The quality assurance process ensures that the demands of high
materials & processes.
level of confidence of the products manufactured entirely to the
The facility includes epoxy resin cast CT & VT pouring plant
customer’s need & satisfaction.
under vacuum process & ovens up to 200 degree C.
The test laboratory has equipments such as:
Use of reputed make of non-aging CRGO silicon steel &
enameled copper wire is made to ensure high quality & long life
of the products. The core windings made from them are cast
under vacuum conditions along with epoxy resin mix in a
special preparation & impregnation plant.
For ease of installation, electroplated mounting plate is
provided at the bottom. The transparent cover facilitates visual
check as well as protects the secondary terminals. The cover can
be sealed thus making it tamperproof.
The product range includes various ratings that meet all
requirements. The entire range of instrument transformer has
been fully type tested as per latest Indian &
• Microprocessor based automated test bench for class
of accuracy, phase angle & ratio error measurements
• Partial Discharge (P.D.) measurements
• Power frequency High Voltage testing equipment up to
100kV for primary side & 5kV for secondary side
• Overvoltage inter-turn test kit
• Polarity tester
• High frequency generator
• Core testing kit
• Digital micro-ohm meter
All the testing equipments are calibrated in NABL approved
laboratory periodically.
• There is a continuous effort at Stelmec to keep abreast of latest technology inline with customers’ requirement.
• All these activities are followed as per ISO 9001 : 2008.
Contact:
SBU: Stelmec Limited, Panels & Instrument Transformer Division, Virar-Vajreshwari Road, Usgaon, P.O. Bhatana, Vasai (E), Dist. Thane-401303.
Tel: +91 91 250 6456432 / 33 / 34
CORPORATE: Stelmec Limited 'Sea Queen', 43-A, H.K. Bhabha Road, Bandstand, Bandra (W), Mumbai - 400 050.
Tel: +91 22 2643 6127 / 28 / 29 | Fax: +91 22 2643 6139 | E-mail: corporate@stelmec.com
website: www.stelmec.com