difference between power transformer and instrument transformer pdf Wednesday, December 16, 2020 5:53:11 PM

Difference Between Power Transformer And Instrument Transformer Pdf

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A variety of types of electrical transformer are made for different purposes. Despite their design differences, the various types employ the same basic principle as discovered in by Michael Faraday , and share several key functional parts. This is the most common type of transformer, widely used in electric power transmission and appliances to convert mains voltage to low voltage to power electronic devices. They are available in power ratings ranging from mW to MW. The insulated laminations minimizes eddy current losses in the iron core.

What is an Instrument Transformer : Types and Their Differences

Premium Membership. Learn from experienced power engineers. Power transformers are used in transmission network of higher voltages for step-up and step down application kV, kV, kV, 66 kV, 33kV and are generally rated above MVA. Distribution transformers are used for lower voltage distribution networks as a means to end user connectivity. It also having a big in size as compare to distribution transformer, it used in generating station and Transmission substation.

The distribution transformer is used for the distribution of electrical energy at low voltage as less than 33KV in industrial purpose and vv in domestic purpose. Power Transformers are used in Transmission network so they do not directly connect to the consumers, so load fluctuations are very less. The average loads are nearer to full loaded or full load and these are designed in such a way that maximum efficiency at full load condition. These are independent of time so in calculating the efficiency only power basis is enough.

Power Transformers are used in Distribution Network so directly connected to the consumer so load fluctuations are very high. As these are time dependent the all day efficiency is defined in order to calculate the efficiency. Power transformers are used for transmission as a step up devices so that the I2r loss can be minimized for a given power flow.

These transformers are designed to utilize the core to maximum and will operate very much near to the knee point of B-H curve slightly above the knee point value. This brings down the mass of the core enormously. Naturally these transformers have the matched iron losses and copper losses at peak load i. Distribution transformers obviously cannot be designed like this. Hence the all-day-efficiency comes into picture while designing it.

It depends on the typical load cycle for which it has to supply. Definitely Core design will be done to take care of peak load and as well as all-day-efficiency. It is a bargain between these two points. Power transformer generally operated at full load. Hence, it is designed such that copper losses are minimal. However, a distribution transformer is always online and operated at loads less than full load for most of time. Hence, it is designed such that core losses are minimal.

In Power Transformer the flux density is higher than the distribution transformer. Its load depends on distribution demand. Distribution Transformer is used at the distribution level where voltages tend to be lower. The secondary voltage is almost always the voltage delivered to the end consumer. Because of voltage drop limitations, it is usually not possible to deliver that secondary voltage over great distances. And this generally occurs in a long transmission line with no load or very low load due to capacitive effect.

Search for:. Difference between Power Transformer and Distribution Transformer. Main Differences Power transformers are used in transmission network of higher voltages for step-up and step down application kV, kV, kV, 66 kV, 33kV and are generally rated above MVA. Related EEP's content with sponsored links. It helps you to shape up your technical skills in your everyday life as an electrical engineer.

Jignesh Parmar Jignesh Parmar has completed M. Tech Power System Control , B. E Electrical. Leave a Comment Cancel Reply. Learn from experienced engineers and sharpen up your knowledge. Browse Courses. The content is copyrighted to EEP and may not be reproduced on other websites. Facebook Linkedin Linkedin Twitter.

Difference Between Current Transformer (CT) & Potential Transformer (PT)

Instrument transformers are high accuracy class electrical devices used to isolate or transform voltage or current levels. The most common usage of instrument transformers is to operate instruments or metering from high voltage or high current circuits, safely isolating secondary control circuity from the high voltages or currents. The primary winding of the transformer is connected to the high voltage or high current circuit, and the meter or relay is connected to the secondary circuit. Instrument transformers may also be used as an isolation transformer so that secondary quantities may be used in phase shifting without affecting other primary connected devices. Current transformers CT are a series connected type of instrument transformer. They are designed to present negligible load to the supply being measured and have an accurate current ratio and phase relationship to enable accurate secondary connected metering.

Premium Membership. Learn from experienced power engineers. Power transformers are used in transmission network of higher voltages for step-up and step down application kV, kV, kV, 66 kV, 33kV and are generally rated above MVA. Distribution transformers are used for lower voltage distribution networks as a means to end user connectivity. It also having a big in size as compare to distribution transformer, it used in generating station and Transmission substation.

Instrument Transformers - CT and PT

Current Transformers CT and Potential Transformers PT are used to measure the current and voltage in a circuit of the order of hundreds of amperes and volts respectively. A CT has large number of turns on its secondary winding, but very few turns on its primary winding. The primary winding is connected in series with the load so that it carries full load current. A low voltage range ammeter A is connected across the secondary winding terminals. Secondary of the CT is practically short circuited since the ammeter resistance is very low.

The electrical instruments are not directly connected to the meters or control apparatus of high voltage for safety purpose. The instrument transformers like voltage transformer and current transformer are used for connecting the electrical instruments to the measuring instruments. These transformers reduce the voltage and current from high value to the low value which can be measured by conventional instruments.

Register now or log in to join your professional community. Power transformer is used for transferring power from low voltage circuit to high voltage circuit and vice versa. They can be step up or step down transformer. Voltage transformer are step down transformer with specific properties. It is used in metering and protection circuit for getting voltage proportionate to high voltage on its primary.

Electrical Academia. Current transformers CT are broadly employed in order to measure high magnitude currents. Such transformers basically step down lower the current which is to be measured, so that it can be measured with an average range ammeter.

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