Starlit Electricals is pleased to introduce ourselves as one of the leading manufacturers of Current/Potential Transformers, Control/Distribution Transformers, HV testers & Auto Transformers. We are 28 years old company with ISO 9001:2008 registration. We are engaged in manufacturing various products & our presence in the market is in all around India. We also export our products to Dubai, Sharjah, Oman, Netherlands, Brazil & Bhutan. We are equipped with latest testing equipment & excellent manufacturing facility. The products undergo strict quality control tests as per relevant IEC/IS specifications. Many of our products are type tested at NABL accredited laboratories.
What we can offer?
High Tension Current Transformer is used to measure the current for HT consumer.
Three Phase Transformer in Pune
Three phase transformers are designed to supply electric power to three-phase systems. These electrical devices have three circuit conductors and may or may not have a neutral wire. Three phase power is used by electric power distribution grids and to power large motors and other large loads. Three phase transformers carry many product specifications, including transformer type, winding turns, cooling method, core type, and mounting style. Performance specifications, regulatory approvals, and special features are also important parameters to consider. Performance specifications include operating frequency range, maximum primary voltage rating, maximum secondary voltage rating, maximum secondary current rating, power rating and operating temperature. Configuration styles for three phase transformers consist o f delta – delta, delta – wye (Y), wye (Y) – wye (Y), wye (Y) – delta, wye (Y) – single phase, delta – single phase.
Three phase transformers are designed to supply electric power to three-phase systems. These electrical devices have three circuit conductors and may or may not have a neutral wire. Three phase power is used by electric power distribution grids and to power large motors and other large loads. Three phase transformers carry many product specifications, including transformer type, winding turns, cooling method, core type, and mounting style. Performance specifications, regulatory approvals, and special features are also important parameters to consider. Performance specifications include operating frequency range, maximum primary voltage rating, maximum secondary voltage rating, maximum secondary current rating, power rating and operating temperature. Configuration styles for three phase transformers consist o f delta – delta, delta – wye (Y), wye (Y) – wye (Y), wye (Y) – delta, wye (Y) – single phase, delta – single phase.
Single Phase Transformer in Pune
Single phase transformers may be used to increase or decrease the voltage from one side of the transformer to the other. The turn ratio or number of windings on the primary and secondary sides of the device determines the change in voltage. Step-up transformers produce a secondary voltage that is larger than the primary voltage. Step-down transformers have a secondary voltage that is smaller than the primary voltage. Variable single phase transformers are devices with a setting for changing the turn ratio as needed. One-to-one transformers well known as Isolation Transformer are single phase transformers with a turn ratio of 1:1.
Single phase transformers may be used to increase or decrease the voltage from one side of the transformer to the other. The turn ratio or number of windings on the primary and secondary sides of the device determines the change in voltage. Step-up transformers produce a secondary voltage that is larger than the primary voltage. Step-down transformers have a secondary voltage that is smaller than the primary voltage. Variable single phase transformers are devices with a setting for changing the turn ratio as needed. One-to-one transformers well known as Isolation Transformer are single phase transformers with a turn ratio of 1:1.
Lighting Transformers in Pune
Lighting Transformers are designed to supply power to lighting equipments in a commercial / industrial / domestic unit. Its primary supply connected to higher voltage 3Ph source and secondary is to be connected to load.Lighting transformers serves as isolation between primary and secondary, it also restricts any high voltage spikes and EMF coming with the raw mains incoming power. Lighting Transformers are very useful when system neutral is not available or faulty i.e. where incoming supply is 3 phase 3 wire and lighting load is 220 Volt single phase. It also restricts short circuit current in the load and saves major accidents.
Power House lighting transformers are made with CRGO laminations and Electrolytic copper super enameled winding wires. They are available for wide ranges of inputs out are in the range and in capacity from 1K VA to 100 KVA.
Lighting Transformers are designed to supply power to lighting equipments in a commercial / industrial / domestic unit. Its primary supply connected to higher voltage 3Ph source and secondary is to be connected to load.Lighting transformers serves as isolation between primary and secondary, it also restricts any high voltage spikes and EMF coming with the raw mains incoming power. Lighting Transformers are very useful when system neutral is not available or faulty i.e. where incoming supply is 3 phase 3 wire and lighting load is 220 Volt single phase. It also restricts short circuit current in the load and saves major accidents.
Power House lighting transformers are made with CRGO laminations and Electrolytic copper super enameled winding wires. They are available for wide ranges of inputs out are in the range and in capacity from 1K VA to 100 KVA.
Distribution Transformer in Pune
The purpose of a distribution transformer is to reduce the primary voltage of the electric distribution system to the utilization voltage serving the customer. A distribution transformer is a static device constructed with two or more windings used to transfer alternating current electric power by electromagnetic induction from one circuit to another at the same frequency but with different values of voltage and current.
The standard Transformation Ratio of Distribution Transformers is from 11000/433 V or 22000/433 V or 33000 / 433 V. Sometimes an offload tap changer with tapings of +/- 2.5% or +/-5% is also provided to adjust to the local site conditions. Depending upon the requirement, an on load tap changer can also be provided.
Our advanced high voltage Distribution transformers incorporate state-of-the art engineering, optimally designed to give you high efficiency & reliability. Our transformers are manufactured in our comprehensive in house facilities, with full control on raw material, design & manufacturing process.
The purpose of a distribution transformer is to reduce the primary voltage of the electric distribution system to the utilization voltage serving the customer. A distribution transformer is a static device constructed with two or more windings used to transfer alternating current electric power by electromagnetic induction from one circuit to another at the same frequency but with different values of voltage and current.
The standard Transformation Ratio of Distribution Transformers is from 11000/433 V or 22000/433 V or 33000 / 433 V. Sometimes an offload tap changer with tapings of +/- 2.5% or +/-5% is also provided to adjust to the local site conditions. Depending upon the requirement, an on load tap changer can also be provided.
Our advanced high voltage Distribution transformers incorporate state-of-the art engineering, optimally designed to give you high efficiency & reliability. Our transformers are manufactured in our comprehensive in house facilities, with full control on raw material, design & manufacturing process.
Earthing Transformer in Pune
In cases where the neutral point of three phase system is not accessible like the system connected to the delta connected side of an electrical power transformer, an artificial neutral point may be created with help of a zigzag connected Earthing Transformer. This is a core type transformer with three limbs. Every phase winding in zigzag connection is divided into two equal halves.
One half of which is wound on one limb and other half is wound on another limb of the core of transformer. End point of all three windings ultimately connected together and forms a common neutral point. Now if any fault occurs at any of the phases in delta connected system, the zero sequence fault current has close path of circulating through earth as shown in the figure. In normal condition of the system, the voltage across the winding of the Earthing Transformer is 1/V3 times of rated per phase voltage of the system.
In cases where the neutral point of three phase system is not accessible like the system connected to the delta connected side of an electrical power transformer, an artificial neutral point may be created with help of a zigzag connected Earthing Transformer. This is a core type transformer with three limbs. Every phase winding in zigzag connection is divided into two equal halves.
One half of which is wound on one limb and other half is wound on another limb of the core of transformer. End point of all three windings ultimately connected together and forms a common neutral point. Now if any fault occurs at any of the phases in delta connected system, the zero sequence fault current has close path of circulating through earth as shown in the figure. In normal condition of the system, the voltage across the winding of the Earthing Transformer is 1/V3 times of rated per phase voltage of the system.
High Voltage Tester in Pune
High voltage tester of breakdown voltage testers( B D V testers) are useful for measurement of breakdown (flashover) voltage of electrical components, insulation materials instruments, transformers, etc. to ascertain quality of insulation material before planning their usage in electrical applications. For H.V Tester upto 5-10 KV the front panel incorporates all controls for operation of the unit. Easy to use test probes connected to H.T cables can be connected directly voltage to the device under test.
For testers greater than 10 KV upto 100 KV, usually separate transformer and control panels are provided separated by a distance of min 6 meters. The Control panel contains the KV meter, mA meter, MCB’;s and other switches Indicators and protection devices and is connected to transformer by means of a 4 core cable.
High voltage tester of breakdown voltage testers( B D V testers) are useful for measurement of breakdown (flashover) voltage of electrical components, insulation materials instruments, transformers, etc. to ascertain quality of insulation material before planning their usage in electrical applications. For H.V Tester upto 5-10 KV the front panel incorporates all controls for operation of the unit. Easy to use test probes connected to H.T cables can be connected directly voltage to the device under test.
For testers greater than 10 KV upto 100 KV, usually separate transformer and control panels are provided separated by a distance of min 6 meters. The Control panel contains the KV meter, mA meter, MCB’;s and other switches Indicators and protection devices and is connected to transformer by means of a 4 core cable.
Auto Transformer for Starting Induction Motor in Pune
A 3 Ph Star connected Auto transformer with a changeover switch forms an Auto Transformer starter. Initially the stator of the induction motor is supplied with reduced voltage through the Auto Transformer using a suitable tap. This limits the starting current to a safe value. Usually 3 tapings per phase (50%, 65%, 80% or 60%, 70%, 80%) or as per customer’s requirement are provided to give that % of line voltage across motor terminals. When the motor attains about70 to 80% of normal speed, then the motor is connected in delta connection which cuts off the Auto Transformer from the circuit and full voltage is applied across motor terminals. The loading the system and power loss involved are less in this type and it can be used in delta as well as star connected motors. The provisions of several tappings make the adjustments possible to suit local conditions.
A 3 Ph Star connected Auto transformer with a changeover switch forms an Auto Transformer starter. Initially the stator of the induction motor is supplied with reduced voltage through the Auto Transformer using a suitable tap. This limits the starting current to a safe value. Usually 3 tapings per phase (50%, 65%, 80% or 60%, 70%, 80%) or as per customer’s requirement are provided to give that % of line voltage across motor terminals. When the motor attains about70 to 80% of normal speed, then the motor is connected in delta connection which cuts off the Auto Transformer from the circuit and full voltage is applied across motor terminals. The loading the system and power loss involved are less in this type and it can be used in delta as well as star connected motors. The provisions of several tappings make the adjustments possible to suit local conditions.
Residual Voltage Transformer in Pune
RVTs are used for residual earth fault protection and for discharging capacitor banks. The secondary residual voltage winding is connected in open delta. Under normal conditions of operation, there is no voltage output across the residual voltage winding. When there is an earth fault, a voltage is developed across the open delta winding which activates the relay. 3 phase RVTs typically have 5 limb constructions.Voltage Transformer in Pune
There are following types and Subtypes of V.Tr.
L.T. Tape insulated varnish impregnated type Voltage Transformer, 1Ph/3Ph
L.T/H.T Cast Resin type Voltage Transformer, 1Ph/3Ph upto 33KV
H.T. Outdoor Oil Cooled type Voltage Transformer upto 66 KV
H.T. Cast Resin / Oil Filled type Residual Voltage Transformer for Capacitor Bank protection
RVTs are used for residual earth fault protection and for discharging capacitor banks. The secondary residual voltage winding is connected in open delta. Under normal conditions of operation, there is no voltage output across the residual voltage winding. When there is an earth fault, a voltage is developed across the open delta winding which activates the relay. 3 phase RVTs typically have 5 limb constructions.Voltage Transformer in PuneThere are following types and Subtypes of V.Tr.
L.T. Tape insulated varnish impregnated type Voltage Transformer, 1Ph/3Ph
L.T/H.T Cast Resin type Voltage Transformer, 1Ph/3Ph upto 33KV
H.T. Outdoor Oil Cooled type Voltage Transformer upto 66 KV
H.T. Cast Resin / Oil Filled type Residual Voltage Transformer for Capacitor Bank protection
Voltage Transformer
The main function of the Voltage Transformer is to reproduce the Primary Voltage on its secondary side. The Voltage Transformer isolates the devices connected to their secondary circuit from the network system. Voltage Transformers are specially designed for measuring and protection applications.
The main function of the Voltage Transformer is to reproduce the Primary Voltage on its secondary side. The Voltage Transformer isolates the devices connected to their secondary circuit from the network system. Voltage Transformers are specially designed for measuring and protection applications.
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