Nisha Engineering Corporation

Bow Bazar, Kolkata, West Bengal

As is well known the transformer plays an important role in the generation, transmission and distribution of electrical energy. Under load the transformer, dissipates heat and the insulating oil acts as a coolant as well as a effective dielectric. Due to the highly hygroscopic nature of the transformer oil, it absorbs moisture from windings, which leads to gradual deterioration of dielectric strength. Truheat oil purifier is the most efficient and economical purification system.

As is well known the Transformer plays an important role in the generation, transmission and distribution of electrical energy. Under load the transformer, dissipates heat and the insulating oil acts as a coolant as well as a effective dielectric.Due to the highly hygroscopic nature of the transformer oil, it absorbs moisture from windings, which leads to gradual deterioration of dielectric strength.TRUHEAToil purifier is the most efficient and economical purification system. It consists of the following:

Components of Plant

1) Filter Unit :The filter unit consists of:

• (a) a Coarse strainer having a wire mesh filter element for retaining solid particles and a powerful magnet for retaining magnetic particles.
• (b) a Filter unit containing round type filter paper discs held under spring compression. These can be easily cleaned off the sediment by reverse flow of compressed gas.

2) Indirect system of Oil Heating :Specially designed heaters with low watt density heat the auxiliary heating oil, which in turn heats the transformer oil maintaining a temperature of 70-80 C. This indirect method of heating completely obviates any localized overheating of transformer oil.

3) Vacuum Dehydration / Degasification Unit :The cylindrical external pressure vessel fitted with a number of shallow drip trays and a specially designed spray pipe. This arrangement increase interfacial surface area.

4) Condenser and Condensate Receiver :For condensing the vapour from dehydration chamber and condensate receiver of welded M. S. construction.

5) Feed and Delivery Pump :Effective feed and delivery pump of rotary gear type coupled directly with motors. Vacuum pump having adequate capacity are provided.

6) Water Seperator :Collects the water produced by the condensor which can be periodically drained out.

7) Control Panel :A centralized control panel incorporated all major electrical devices with indicating lamps is provided

• (a) Imported thermostat for temperature cut off at desired
• (b) Thermometer for measuring temperature of both heating as well as transformer oil
• (c) Pressure & Vacuum gauges
• (d) Flow control indicator
• (e) Electronic Float Control
• (f) Electrical instruments, voltometers and ammeters
• (g) Electrical overloads and overload releases for safety of motors.

We are offering transformer oil filter.Under normal circumstances, the single stage vacuum filter plant is extremely effective. However in exceptional cases where a higher state of vacuum is required to maintain low value of dissolved gases and moisture, we offer a double or three stage vacuum filter. Added advantage of this system include the facility of improving quality of filtered oil to a higher level under single pass at a temperature of about 60c.

These equipment are ideal to test electrical strength of different insulating materials, motor winding transformer, Ceramic HV insulator, cables & other different electrical components.

We offer Oil Test Set.Our Oil Test sets are ideal for speedy and accurate testing of dielectric strength of transformer and circuit breaker oils as per IS:6792-1972. Output: We give continuously variable output from 0-50 KV, 0-60KV, 0-75KV, 0-100KV, or 0-120KV. Sets are available either in manual or motor operated. General Arrangements: The set will comprise of the following H. T. Transformer, control circuit & Test Cell with electrode & gauge and supplied in a single unit. The transformers will be cast resin type air-cooled.

These Relay Test Sets are ideal to test protective Relay, over current Relay, Earth Fault Relay and Circuit Breaker. The set provides different parameters like AC Current, AC Voltage, DC Voltage and Time measuring scope (Digital Time Interval Meter).

These equipment are ideal for speedy and accurate testing of High Voltage Cable Insulation, High Voltage Capacitance Insulation Motors and Switchgear.

We offer Induced Over Voltage Test Set.These are suitable to test Induced Over Voltage of those Distribution Transformer, Power Transformer, different Step Down and Step Up Transformer and motors whose rated voltage is below 600 VInput : 415 VOutput : 0 - 1300 with live different tappingsMaximum Capacity : in KVA as per customers requirementCooling : Air Natural Cooled

We are offering distilled water plant.Pure water is a requirement of every industry. Wall mounted water stills are useful only when the requirement of the pure water is limited. For higher output capacities, we have designed an efficient barhstead type water distillation plant. The most unique feature of this plant, manufactured as per is:1969, is its easy maintenance.