Potential Transformer （PT）
Why Choose Us
Wuxi Huipu Electronics Co., Ltd. has engaged in the production of electronic components for 20 years, passed and strictly followed the ISO-9001:2015 quality system certification, the team has accumulated rich experience in R&D, production management and quality assurance. We specialize in producing Edgewise Wound Inductors, Square Common-mode Inductors, Ring Transformer, Three-phase Inductor, Single-phase Inductor, and other common Mode Inductors.
Wide range of applications
Our products are widely used inIndustrial power supply, fire control power supply, charging pile, medical power supply, aerospace, automotive electronics, rail transit, photovoltaic, wind power generation, energy storage inverter, smart grid, robot industry, consumer electronics and other fields.
Advanced Equipment
We have very advanced Automatic winding machine, automatic soldering machine, LCR automatic bridge, insulation withstand voltage tester, Winding Dielectric Test Instrument, Transformer integrated test bed and other production equipment.
Quality Assurance
Our company has obtained UL, CE, CQC, ISO-9001, Patents Certificate, High-Tech Enterprise Qualification related certifications.
Wide Product Range
The products we produce include but are not limited to High-frequency transformers, low-frequency transformers, surface mounted transformers (SMD transformers), reactors, power filter inductors, power adapters, solenoid valve coils, high-voltage transformers, current transformers, voltage transformers.
What is Potential Transformer
A Potential Transformer Also known as PT or Voltage transformers, are a parallel-connected type of instrument transformer. They are designed to present a negligible load to the supply being measured and have an accurate voltage ratio and phase relationship to enable accurate secondary connected metering. If you want to know the specifications and prices of Potential Transformer, please contact us!
Advantage of Potential Transformer
Voltage Reduction to Safer Level
Potential transformers, being step-down transformers, are considered perfect for reducing high voltage to low voltage due to the accuracy offered by them. They easily reduce the voltage to safer levels and help in the measurement and monitoring of voltage levels precisely.
Safety From Damage
Every year, lots of equipment gets damaged due to electric shock and fluctuating voltage. At times, it also results in causing fire and heavy damage. That is when a potential transformer helps by keeping track of the voltage level with the help of a voltmeter. It controls the voltage and reduces the risk of damage from electrical shocks and equipment.
Accuracy in Voltage Measurement
To avoid damage to electrical equipment, precise voltage monitoring is essential, especially for devices where even a little fluctuation can cause huge damage. By getting accurate readings, it becomes easier to reduce voltage to the desired level.
Cost-Effective Solution
In comparison to multiple voltage measuring equipment, potential transformers are considered less expensive. It is one of the reasons why most industries prefer to go for this transformer instead of other devices, as it helps them save a good amount.
Type of Potential Transformer
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Electromagnetic
This model of transformer is comparable to the oil-filled coiled wire transformer because it uses a wire-wound core. The primary voltage will be turned entirely into the secondary voltage in this sort of converter, which the use of electromagnetic would accomplish. -
Capacitor
This kind of voltage transformer will be equipped with a capacitive potential divider, which will be linked between the main-line phase and the ground. As a mixture of the capacitive voltage divider and a magnetic transformer, this converter can be thought of as a hybrid device of sorts. These transformers are referred to as intermediary converters with a relatively tiny ratio in the industry.
This type of transformer, which is composed of a stack of high-voltage capacitors, can be utilized for voltage metering in addition to being employed as a protection system. As a result, the capacitors may reduce the voltage levels, and a transformer then steps down the lowered voltage to a supplementary voltage level. -
Optical
Optical voltage transformers are quite a new type of power transformer that can be used for safety and metering applications instead of the usual electric-magnetic converters. Its benefits have been extensively addressed in scientific and technological literature, and its business functions have been highly acknowledged and established in the marketplace.
Many electric plant operators try to steer clear of them because of the high expenses and because the technology is relatively recent. It is not controlled by local professionals, necessitating significant contracts with the manufacturers to operate.
Due to the fact that it's already been demonstrated that optical innovation has its own set of benefits and drawbacks, the exploration of alternative optical solutions has become the primary goal of high-tech laboratory settings, and it is also the primary goal of the current work.
Difference Between Current Transformers and Potential Transformers
Function
One of the major differences between CT and PT transformers is their functions. On the one hand, a current transformer reduces a high current to a safer and more manageable level that you can measure. It converts large primary currents into small 1A/5A currents that can be measured on the ammeter. On the other hand, a potential (voltage transformer) measures and reduces high voltage values into lesser values. It converts the high voltage into a standard secondary voltage of 100V or lower.
Types
The current transformer is divided into two types, including wound and closed core. The potential transformer is also divided into two categories(types), including electromagnetic and capacitor voltage.
Connection
In the current transformer, the primary winding is connected in series to the transmission line whose current is to be measured, and full line current flows via the winding. On the other hand, the potential transformer is connected in parallel with the circuit, meaning full line voltage appears across the winding.
Transformation Ratio
The transformation ratio in a current transformer is high, while in the potential transformer, the ratio is low.
Primary and Secondary Winding
In a current transformer, the primary winding has a smaller number of turns and carries the current to be measured. In potential transformers, the primary winding has many turns and carries the voltage to be measured.
In a current transformer, the secondary winding possesses large numbers of turns on the secondary side and is connected to the current winding of the instrument. In a potential transformer, the secondary winding has a small number of turns on the secondary side and is connected to the meter or instrument.
Core
The current transformer is designed with silicon steel lamination, while a potential transformer is designed with top-quality steel operating at low flux densities.
Primary Current
In a current transformer, the primary current doesn't depend upon secondary side circuit conditions. On the other hand, in the potential transformer, the primary current relies on secondary side circuit conditions.
Use
With a current transformer, you can use a 5 Ampere ammeter to measure high currents such as 200 amperes. On the other hand, with a potential transformer, you can use a 120V voltmeter to measure high voltages such as 11KV.
Secondary Side
In the current transformer, the secondary side cannot be open-circuited when under service. On the other hand, in a potential transformer, you can open-circuit the secondary side without any damage.
Input Value
In the current transformer, the input value is constant current, whereas, in a potential current, it is a constant voltage.
Secondary Winding Range
In a current transformer, the range is 1A or 5A, while in a potential transformer, it is 110V.
Burden
The current transformer doesn't rely on the secondary burden, whereas the potential transformer depends on the secondary burden.
Applications
A current transformer has different applications, including measuring current and power, monitoring the power grid operation, and operating a protective overlay.
On the other hand, the potential transformer's applications include power source, measurement, and operating protective overlay.
Component of Potential Transformers
The core provides a low reluctance path for electromagnetic flux and supports the primary and secondary windings. It is made by stacking thin sheets of high-grade grain-oriented steel which are separated by thin insulating material. In order to minimize the hysteresis and eddy currents, the carbon content of the core steel is maintained below 0.1%. When it is alloyed with silicon, eddy currents can be reduced.
The transformer carries two sets of winding per phase – Primary winding and secondary winding. These winding consists of several turns of copper or aluminum conductors, insulated from each other and the transformer core. The type and arrangement of winding used for transformers depend upon the current rating, short circuit strength, temperature rise, impedance, and surge voltages.
Insulation is the most important part of transformers. Insulation failures can cause the most severe damage to transformers. Insulation is required between the windings and the core, between windings, between each turn of the winding, and between all current-carrying parts and the tank. The insulators should have high dielectric strength, good mechanical properties, and high-temperature withstand ability. Synthetic materials, paper, cotton, etc are used as insulation in transformers.
The main tank is a part of a transformer that serves two purposes:
Protects the core and the windings from the external environment.
Serves as a container for oil and support for all other transformer accessories.
For connecting incoming and outgoing cables, terminals are present in transformers. They are mounted upon the bushings and connected to the windings' ends.
Bushings are insulators that form a barrier between the terminals and the tank. They are mounted over the transformer tanks. They are a safe passage for the conductors connecting terminals to the windings. They are made from porcelain or epoxy resins.
In all oil-immersed transformers, transformer oil provides added insulation between the conducting parts, better heat dissipation, and fault detection features. Hydro-carbon mineral oil is used as transformer oil. It is composed of aromatics, paraffin, naphthenes, and olefins. Transformer oil has a flashpoint of 310 degrees Celsius, a relative permeability of 2.7, and a density of 0.96 kg/cm3.
The oil conservator is moved on top of the transformers and is located well above the tank and bushings. Normally a rubber bladder is present in some oil conservators. The transformer oil expands and contracts with an increase and decrease in temperature. The oil conservator provides adequate space for oil expansion. It is connected to the main tank through a pipe. A level indicator is fitted to the conservator to indicate the oil level inside.
Breather is present in all oil-immersed transformers that have a conservator tank. It is necessary to keep the oil-free from moisture. As the temperature variations cause the transformer oil to expand and contact, air flows in and out of the conservator tank. This air should be free from moisture. Breather serves this purpose.
The power lost in the transformer is dissipated in the form of heat. Dry transformers are mostly natural air-cooled. But when it comes to oil-immersed transformers, a variety of cooling methods are followed. Depending on the kVA rating, power losses, and level of cooling requirements, radiators and cooling fans are mounted on the transformer tank.
Tap changers are used to adjust the secondary voltage of transformers. They are designed to change the turn ratio of the transformer as required. There are two types of tap changers: On-load tap changers and Off-load tap changers.
Buchholz relay is one of the most important parts of oil-immersed transformers rated over 500kVA. It is an oil and gas actuated relay that is used to sense faults occurring in the parts immersed in the oil. Short circuits occurring under the transformer oil generate enough heat to decompose the oil into hydrogen, carbon monoxide, methane, etc. These gases gradually move toward the conservator tank through the connecting pipe. Buchholz relay, which is mounted on the pipe connecting the conservator tank and the main tank, senses these gases and activates the trip and alarm circuits. The trip circuit opens the circuit breaker supplying current to the primary winding and interrupts the current flow.
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Frequently Asked Questions
Q: What is the principle of Potential transformer?
Q: What is the difference between a current transformer and a voltage transformer?
Q: What is the function of PT in electrical?
Q: What is PT ratio?
Q: What is the purpose of potential transformer?
Q: What is the meaning of PT in transformer?
Q: What are the applications of PT transformer?
Q: Why is PT connected in parallel?
Q: What is the working principle of PT?
Q: How CT and PT are connected?
Q: What is the advantage of potential transformer?
Q: Why is PT Secondary 110V?
Q: Why is bus PT needed?
Q: Where is CT and PT transformer used?
Q: Why is PT primary grounded?
Q: Why is PT secondary grounded?
Q: What are the causes of PT failure?
Q: Why use PT in electrical?
We're well-known as one of the leading potential transformer （pt） manufacturers and suppliers in China. If you're going to buy cheap potential transformer （pt） made in China, welcome to get free sample from our factory. Also, customized service is available.
high accuracy pt, ct for three phase transformers, ct for step-down transformers