OLTC Distribution Transformer

OLTC Distribution Transformer (On load tap changer oil cooled Distribution Transformer )

RANGE :Upto 5 MVA in 11, 22, & 33 KV Class.

NGG Power Tech manufactures a wide range of Oil Filled Distribution & medium power Transformers with On Load Tap Changer (up to 5000 KVA in 11 KV & 33 KV Class) conforming to Indian Standard (IS 1180 & IS 2026) and the international standards (IEC 60076) of quality and safety. These transformers are designed and developed using latest technologies and can be provided with a variety of terminations so as to suit the requirements for new installation or replacement.

Optimum efficiency is ensured by delicate proportioning of core and winding losses using high grade Prime CRGO Lamination i.e MOH 23, M3 to M4, ZDKH23, PH90 Lamination, or amorphous Lamination, Electrolytic Grade 99.9% pure copper or Electrolytic Grade 99.72% pure Aluminium, with Transposition in L.V. coil for current sharing in parallel Conductors, Epoxy Dotted Paper, Electric grade press paper, boards and mineral oil. Thus better efficiency is achieved resulting in longer life.

FEATURES

Designed for 25 years of trouble-free performance
Design conforms to IS 1180, 2026, BS 171, IEC 76, and other relevant standards
Low power loss and low noise
Designed to withstand electrical impulses, thermal and dynamic stresses
Optimum utilization of active materials for compactness
HIGH PERFORMANCE WITH LIFE EXTENSION AND LOADING FLEXIBILITY
Modern manufacturing techniques ensure cost-effectiveness and reliability

STANDARD SPECIFICATIONS

Capacity	–	Up to 4000 KVA
No. of Phases	–	3 Phase
Frequency	–	50 Hz.
Voltage Range	–	11 kV/22kV/33kV
Tapping	–	+ 5% To -15% Taps on H.T. Side in steps of 1.25% each or as customer required.
Insulation	–	Class ‘F’/ ‘H’
Vector Group	–	Dyn 11
Duty Cycle	–	Continuous
Winding	–	Copper Wound
Terminals	–	As per required

STANDARD FITTINGS

Rating & Diagram plate	–	Earthing terminals
Lifting lugs	–	Thermometer pocket
Oil Conservator with drain plug	–	Air release hole with plug
Oil Level indicator	–	Explosion vent with diaphragm
Top-filter Valve	–	Inspection cover.
Silica gel breather	–	Drain –cum-bottom-filter valve
Cooling radiators (PSR, Elliptical Tubes and Corrugated Type)	–	Uni / Bi- directional rollers

OPTIONAL FEATURES

Buchholz relay with alarm and trip contact	–	Magnetic oil level gauge with alarm contact
Pressure Release Valve	–	Marshalling box to house O.T.I. and W.T.I
Cable Box on H.T. Side	–	Cable Box on L.T. Side.
Oil Temp. Indicator with alarm & trip contact	–	RTCC (Remote Tap Changer Control) Cubicle
Winding Temp. indicator with alarm & trip contact	–	Electronic Automatic Voltage Controller
DGPT Relay	–	Optimum utilization of active materials for compactness·
Neutral current transformer

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OLTC Distribution Transformer