Transformers

Transformers: Power Transformers, Distribution Transformers, Solar Transformer

Transformers are essential components in electrical power distribution, ensuring efficient transmission and distribution of electricity. Dynamech Electropower Pvt Ltd offers a comprehensive range of transformers, including power transformers and distribution transformers, along with a variety of fittings and accessories to meet your energy needs.

Types of Transformers

1. Power Transformers :

The Power transformer is a transformer that is used to transmit electrical energy in any component of the electronic or electrical circuit between the distribution primary circuits and the generator. These transformers are utilized in distribution networks to interface step down and step up voltages. The usual form of power transformer is fluid immersed, and the life cycle of these instruments is approximately 30 years.

Features:

Salient Features:

  • Proper shield circuit strength
  • Compact design
  • Durable
  • Optimum losses
  • Use of magnetic shields to control strong flux
  • Low flux density to withstand severe over excitation
  • Thermally upgraded paper to improve transformer lifetime
  • Insulation dressing optimization using FEM analysis
  • De-energized tap changers (DETC) are typically provided in transformers
  • Optionally, on-load tap changes (OLTC) are also available
  • Available fluids: mineral oil and luminal oil customized design

Standard Features :

  • Transforming medium voltage into high voltage levels
  • Based on tried and tested technologies
  • Meeting the latest I.E.C. technical specification
  • Large overload capability depending on the ambient temperature
  • Large overvoltage capability on generator side to withstand the overvoltage coming for load rejection
  • Customized solution
  • Satisfying specific customer requests
  • Equipment for indoor and outdoor usage

Range of Power Transformers: 5 MVA to 10 MVA

2. Distribution Transformers:

Distribution transformer is also referred to as a typical isolation transformer. The main function of this transformer is to convert the high voltage into normal voltage like 240/120 V for use in power distribution. In the distribution system, there are different types of transformers, such as single-phase, 3-phase, underground, pad-mounted, pole-mounted transformers.

Range of the distribution transformer: 10 KVA to 2500 KVA 11/0.433 KV, 33/0.433 KV

3. Solar Transformer:

Transformers are critical components in solar energy production and distribution. Historically, transformers have ‘stepped-up’ or ‘stepped-down’ energy from non-renewable sources. There are different types of solar transformers including distribution, station, sub-station, pad mounted and grounding.

  • DC generated is converted to alternating current (AC) by inverters and the AC is connected to the power grid by a step-up transformer.
  • The international standard applicable for the transformers for DPV generation is IEEE C57.159 2016 “IEEE Guide on transformers for application in distributed photovoltaic (DPV) power generation system”.

Solar Distribution Transformers:

Electric power is generated by converting solar energy to d.c by using photovoltaic (PV) cells. The DC generated is converted to a.c by inverters and the A.C is connected to the power grid by a step-up transformer. The international standard applicable for the transformers for DPV generation is IEEE C57.159 2016 “IEEE Guide on transformers for application in distributed photovoltaic (DPV) power generation system”.

Features of Solar Transformers:

  • Rating upto 6.75 MVA
  • HV Voltage 11, 22 & 33 or as per customer requirement.
  • LV Voltage – 0.30, 0.38, 0.420, 0.433, 0.750, 1.05, 6.6 or as per customer requirement.
  • Vector Group – Dy11Y11, Dy11, Y11y11, Dy5y5y5 or as per customer requirement.
  • Voltage step-up from the inverter output to the MV feeding network.
  • Galvanic isolation between the solar inverter and feeding network.
  • High mechanical strength LV windings comprises two windings made of aluminium or copper both connected in wye (Y) with or without a neutral point.
  • Natural or air forced cooling system.
  • Robust and oil tight mechanical construction with customised overall dimensions.
  • High quality surface protection.
  • Protection & monitoring with devices that offer oil level indication, gas detection, pressure and temperature control.

Testing for Quality Assurance:

  • Insulation Resistance & PI Test
  • Voltage Ratio Measurement
  • Vector Group and Polarity Check
  • Induced Over Voltage Test
  • Separate Source High Voltage Test
  • No Load Losses and Magnetic Current Measurement
  • Load Losses and Impedance Voltage Measurement
  • Zero Sequence Current Measurement
  • Winding Resistance Measurement
  • Temperature Rise Test
  • Pressure and Vacuum Testing
  • Dielectric Strength of Transformer Oil Test
  • Tan Delta Test
  • Paint Adhesion Test
  • Partial Discharge Test
  • Magnetic Balance Test

Additional Testing:

  • Short Circuit Withstand Test
  • Impulse Voltage Withstand Test
  • Temperature Rise Test
  • Air Pressure Test

4.Auxiliary Transformer:

Auxiliary transformers are static devices that function as step down transformers, transforming electricity from one alternating current circuit to another alternating current circuit at the same frequency. An auxiliary transformer is essential to the smooth running of a substation.

Application of an Auxiliary Transformer

  • Assist in isolating the high voltage & low voltage systems
  • This improves safety by preventing electrical problems from spreading from one system to another.
  • Control the low voltage system’s voltage. This maintains the voltage provided to the auxiliary devices within acceptable limits.
  • Reduce the fault current.
  • Auxiliary transformers help to reduce the amount of current that can flow in the event of a fault by isolating the high voltage & low voltage systems. This serves to protect the equipment and prevent outages.
  • Auxiliary transformers are necessary components of any substation operations
  • It performs an essential function in providing the power grid’s reliability and safety

5.Booster transformers:

Booster transformers are used in electric railway AC catenary feeders to collect the return current from the rails and the earth to the return conductor.

In railways, the electric current is taken from the catenary conductor to the locomotive, where the energy is used by electric motors and fed to the earth-connected rails, which are part of the return circuit. From the rails, however, the return current may deviate around to unintended or harmful places like metallic pipelines, bridges, communication cables, etc. The stray currents bring about interference in communication systems and other electronic devices due to passing trains.

Use Of Booster Transformer:

Booster transformers are used to eliminate the stray currents and the disturbances, obliging the return current to flow to the return conductor.


Warranty and After Sales Service:

All our products are warranted against any manufacturing defect. We pride ourselves on our excellent and prompt after-sales service network, ensuring customer satisfaction and peace of mind.

This detailed content layout provides comprehensive information about transformers, their fittings, testing procedures, and after-sales service, ensuring visitors have all the information they need.