short circuit test of transformer in hindi | short circuit test of transformer | practical | test

Mind of Engineer

6 Nov 202104:44

Summary

TLDRThe script discusses the process of performing a short circuit test on a transformer, focusing on the primary, winding, and high voltage binding. It explains the use of a voltmeter and wattmeter to measure the rated voltage and current, applying a reduced voltage to induce a small current for detecting short circuits. The video will guide viewers through the switch connection diagram, the calculation of copper loss, and the importance of measuring parameters like resistance and inductance. It encourages viewers to subscribe for regular updates on electrical testing techniques.

Takeaways

⚡ Short circuit test is performed on the primary winding and high voltage binding of the transformer to determine copper loss efficiency and transformer equivalent resistance impedance.
📊 In the short circuit test, voltmeter, ammeter, and wattmeter are connected to the high voltage side of the transformer.
🔌 A small percentage (5-10%) of the rated voltage is applied using an autotransformer during the short circuit test.
🔋 The secondary or low voltage side remains shorted during the short circuit test.
📉 The ammeter measures the current, and the wattmeter measures the copper loss during the short circuit test.
🧲 The magnetic flux depends on the applied voltage; reduced voltage results in less magnetic flux and, consequently, lower core losses.
🔍 The wattmeter indicates copper losses since the reduced magnetic flux causes minimal iron losses during the test.
🔗 The equivalent resistance and impedance are determined using the measured parameters from the short circuit test.
📐 Copper losses are directly proportional to the current, while core losses depend on the voltage and magnetic flux.
🔔 Viewers are encouraged to subscribe to the channel and press the bell icon for regular updates and more detailed explanations on various topics.

Q & A

What is the purpose of performing a short circuit test on a transformer?
-The purpose of performing a short circuit test on a transformer is to determine copper losses, efficiency, and the equivalent resistance and impedance of the transformer.
Which components are connected on the high voltage side during a short circuit test?
-During a short circuit test, a voltmeter, ammeter, and wattmeter are connected on the high voltage side of the transformer.
How is the voltage applied during the short circuit test?
-In the short circuit test, a voltage that is 5-10% of the rated voltage is applied using an autotransformer to the high voltage side of the transformer.
What happens to the secondary or low voltage side during the short circuit test?
-During the short circuit test, the secondary or low voltage side is short-circuited.
Why is the applied voltage in the short circuit test very low?
-The applied voltage is very low to ensure that the magnetic flux created is minimal, leading to reduced core and iron losses.
What is the role of the wattmeter in the short circuit test?
-The wattmeter measures the copper losses in the transformer during the short circuit test.
How is the rated current applied during the short circuit test?
-The rated current is applied to the circuit by adjusting the voltage from the autotransformer to ensure that the current flowing is at the rated value.
What does the wattmeter measure during the short circuit test?
-The wattmeter measures the power loss due to the copper losses in the transformer.
How is the equivalent resistance of the transformer calculated in the short circuit test?
-The equivalent resistance is calculated using the power loss measured by the wattmeter and the rated current, with the formula P = I^2 * R.
What parameters can be determined from the short circuit test?
-From the short circuit test, the copper losses, equivalent resistance, and impedance of the transformer can be determined.

Outlines

00:00

🛠️ Transformer Short Circuit Test Basics

This paragraph introduces the primary aspects of short circuit testing for transformers, focusing on the transformer's windings and high voltage bindings. It explains the purpose of the test, which is to determine the transformer's equivalent resistance and inductance. The script mentions the use of a voltmeter and wattmeter in the high voltage side connection diagram for the short circuit test, and how a rated voltage of 5-10% is applied to the circuit. It also touches on the importance of measuring the magnetic flux, which depends on the supply voltage, and how reduced magnetic flux leads to lower losses and less speed in the transformer.

Mindmap

Keywords

💡Short Circuit Test

The Short Circuit Test is performed on a transformer to determine its equivalent resistance and impedance, which are essential for evaluating efficiency and copper losses. In the script, this test is described in detail, including the connection of voltmeters, ammeters, and wattmeters to the high voltage side to apply a small percentage of the rated voltage.

💡Copper Loss

Copper Loss refers to the power lost due to the resistance of the transformer windings, which manifests as heat. The script explains that during the Short Circuit Test, the wattmeter measures these losses as the current flows through the windings, depending on the rated current.

💡Equivalent Resistance

Equivalent Resistance is the resistance that would replace the transformer windings' resistance to produce the same power loss. The Short Circuit Test helps in determining this parameter, as mentioned in the script, by applying a low voltage and measuring the resulting current and losses.

💡Impedance

Impedance is a combination of resistance and reactance in the transformer, affecting how it responds to AC currents. The Short Circuit Test evaluates the impedance by measuring voltage, current, and power losses. The script highlights this aspect while explaining the test's procedures.

💡Rated Voltage

Rated Voltage is the maximum voltage a transformer is designed to handle efficiently. The script mentions that during the Short Circuit Test, a small percentage (5-10%) of the rated voltage is applied to the high voltage side to perform the test safely.

💡Wattmeter

A Wattmeter is an instrument used to measure electrical power in watts. In the Short Circuit Test, as described in the script, the wattmeter measures the power loss in the transformer windings, which helps in calculating copper losses.

💡Voltmeter

A Voltmeter measures the electrical potential difference between two points in a circuit. During the Short Circuit Test, voltmeters are connected to the high voltage side to ensure the applied voltage is within the required small percentage of the rated voltage, as explained in the script.

💡Ammeter

An Ammeter measures the electric current in a circuit. In the context of the Short Circuit Test, the script details how ammeters are used to measure the current flowing through the transformer windings, which is crucial for determining losses and impedance.

💡Autotransformer

An Autotransformer is a type of transformer with a single winding that acts as both the primary and secondary winding. The script explains its use in the Short Circuit Test to adjust and apply a precise percentage of the rated voltage to the transformer being tested.

💡Magnetic Flux

Magnetic Flux is the measure of the quantity of magnetism, considering the strength and the extent of a magnetic field. The script notes that during the Short Circuit Test, the applied voltage affects the magnetic flux, which in turn impacts the core losses and efficiency of the transformer.

Highlights

The primary, winding, and high voltage binding of the 168 test transformer perform the short circuit test.

A voltmeter and wattmeter are connected to the high voltage side for the short circuit test of the transformer.

Another transformer is connected to the high voltage side to help apply a rated voltage of 5 to 10 percent in the circuit.

The secondary side and low voltage side are kept soft during the test to avoid any current flow.

The test involves measuring the reduced magnetic flux which depends on the supply voltage.

A reduced magnetic flux results in lower core speed and consequently less iron loss due to the reduced current.

The short circuit test helps in determining the copper loss, which is observed through the wattmeter.

The rated current of the transformer during the short circuit test is applied to calculate the copper loss.

Losses in the circuit are calculated using the equation for copper loss, denoted by PC.

The equation for copper loss involves the square of the current and the resistance of the coil.

The supply board is used to major the losses in the circuit, which are then measured by the wattmeter.

The short circuit test involves folding only the branch parameters, which are then calculated for the CS and its notches.

The test determines the under root value of the CS, which is essential for understanding the performance of the transformer.

The transformer's performance is analyzed based on the current and voltage dependencies during the short circuit test.

The short circuit test plates are performed to remind the current and voltage dependencies.

The video encourages viewers to subscribe for regular updates on electrical engineering topics.