Power Engineers is known for reliability and continuous improvement in the field of rolling contact type automatic voltage controller

Power Engineers is known for reliability and continuous improvement in the field of rolling contact type automatic voltage controller, automatic voltage booster,automatic voltage stabilizer, chemical process rectifiers, electroplating power rectifiers and special purpose transformers. The systems are designed and supervised by a team of qualified engineers having more than 35 years of experience to achieve best possible quality and total customer's satisfaction.

achieve best possible quality and total customer's satisfaction.

Power Engineers is known for reliability and continuous improvement in the field of rolling contact type automatic voltage booster, servo voltage controller,
single phase step voltage regulator

, chemical process rectifiers, electroplating power rectifiers and special purpose transformers. The systems are designed and supervised by a team of qualified engineers having more than 35 years of experience to achieve best possible quality and total customer's satisfaction.

The basic working principle of power transformer accessories

The principle of pole mounted transformer accessories: When a sinusoidal communication voltage U1 added to the primary coil at both ends, the conductor in the alternating current I1 and the occurrence of alternating magnetic flux ф1, which along the core through the primary and secondary coil form closed Magnetic circuit. In the secondary coil inductive mutual induction potential U2, together ф1 will also be induced in the primary coil of a self-inductance potential E1, E1 and the direction of the voltage U1 opposite the direction of the ups and downs, and then bound the size of I1. In order to adhere to the existence of flux ф1 need to have a certain power consumption, and the 37.5kva transformer itself has some loss, although at the moment no secondary load, the primary coil is still a certain current, the current we call "no-load current" . If secondary load connected to the secondary coil current I2 occurs, and therefore magnetic flux ф2, ф2 and ф1 opposite direction, played a mutual canceling effect, so that the total core magnetic flux has been reduced, and then make The primary self-inductance voltage E1 cut, the results of the I1 increases, showing the primary current and secondary load are closely related. When the secondary load current increases when I1, ф1 also added, and ф1 added some happened to be offset by ф2 that some magnetic flux, to maintain the core of the total magnetic flux unchanged. If you do not consider the loss of the transformer, can be considered an ideal secondary transformer power consumption is the primary power from the power to obtain power. Transformer can be modified according to the need to change the number of secondary coil winding number of secondary voltage, but can not change the power consumption to allow the load.

Cause Analysis of Transverse Leakage Reactance of Power Transformer

pole mounted transformer In concentric windings, for many reasons, such as voltage regulation or design, etc., may cause the actual height of the low or high voltage windings to return, specifically, whether low or high voltage or medium voltage Windings, their different levels of voltage required by the insulation level will be different, in order to ensure that the transformer in all aspects to achieve the best condition, we must be local conditions, targeted design and production, so to ensure its accuracy. Therefore, in practice, the transformer is generally not possible at the same height on the different voltage transformer winding turns are equal, then the excess number of turns to produce transverse flux, and these transverse flux in the concentric winding In the formation of lateral leakage reactance. Transverse leakage reactance is different from the Amorphous Metal Distribution Transformer winding corresponding to the number of ampere turns of the difference, that is, unbalanced ampere turns produced, the smaller the number of unbalanced turns, then the lateral leakage reactance is also smaller, if the number of turns To achieve a fully balanced state, then no lateral leakage reactance will be produced. Finally, we calculated by the formula, you can get all the short-circuit transformer reactance value, we can according to the results obtained to determine the transformer reactance value is not in line with national standards or international standards.

Why do the transformer winding leakage current test

Winding leakage current test purpose DC leakage test voltage is generally higher than the megger voltage, and can be adjusted, so it is more effective than the megger found defects, can be sensitive to reflect the porcelain insulation cracks, interlayer insulation Internal moisture and local loose fracture of insulating oil degradation, insulation along the surface of carbonization.
The polemounted transformer core and other accessories are in the electric field around the winding, if not grounded, the core and other accessories must sense a certain voltage, under the action of the applied voltage, when the induced voltage exceeds the discharge voltage to ground, Will produce discharge phenomenon. In order to avoid the internal discharge of the 37.5kva transformer, so the core ground.

Dry - type transformers should meet the technical requirements

Power transformers and pole mounted transformers, oil-immersed transformers are all three of the more common in the transformer, is also the main operation of the three major electrical products, the following by the power transformer factory - Device requirements. For fuse protection of transformers, the performance of the fuses must meet the system short-circuit capacity, sensitivity and selectivity requirements. oil immersed distribution transformer fitted with gas relays shall be installed with an elevated slope of 1% to 1.5% in the direction of the gas relays.

A Method to Reduce the Disturbance of Transformer to Amplifier

dry power transformers can be through the magnetic field, electromagnetic induction and the circuit to form interference amplifier is the biggest noise source in the audio machine. Therefore, to deal with its working condition and application environment, in order to effectively avoid the interference generated by the power transformer, the amplifier get excellent sound. Here I will discuss this with you.
Power transformer in addition to the amplifier power supply, but also to the amplifier and power coupled to the power grid in the interference source into the amplifier, but also the amplifier voltage and current changes reflected in the grid. In order to cut off the electrostatic field between the winding and capacitive coupling, isolation and common mode suppression of the resulting interference, to avoid the grid or circuit in the common-mode voltage coupling to the secondary or primary to the audio single phase step down transformer windings Faraday electrostatic shielding is critical. The shielding can be interlayer copper foil, can also be a complete co-shaped structure, in short, on the winding (especially for the primary winding) the more surrounded the better common mode rejection.

Distribution transformer capacity how to choose

At present, in the operation of distribution transformers, there are cases of under-load operation due to excessive capacity, and overheating or even burn-out due to overload or over-current operation. This kind of device capacity choice improperly, has affected the power system power supply reliability and the economy.
step voltage regulators capacity is selected on the basis of load statistics. Since the load is not expected to be readily available, the maximum expected load is chosen. This election results, often set the capacity is too large, the power system to bring adverse effects. If the choice of economic operation, is the use of transformer copper loss and iron loss equal conditions, derive the maximum economic load factor Amorphous Core Transformer and the transformer rated capacity and maximum load ratio. As the actual operating load is not necessarily the maximum load load statistics, and the load is random, operating efficiency is variable, and its economic operating efficiency is difficult to achieve.

The basic composition of the transformer

three phase pad mounted transformer components include the body (core, winding, insulation, lead), transformer oil, fuel tank and cooling devices, pressure regulator, protection devices (moisture, airway, gas relays, oil conservator and temperature measurement devices ) And outlet bushing.
1, core
Core is the main part of the transformer in the magnetic circuit. Usually by the high silicon content, thickness 0.35mm \ 0.3mm \ 0.27mm, coated with insulating paint by the surface of hot-rolled or cold-rolled silicon steel sheet laminated together.
Core is divided into two parts of the core column and the cross-section, the core column sets a winding; transverse magnetic circuit is used.
Core structure of the basic form of heart-and shell-type two.
2, winding
Winding is the circuit part of the Amorphous Metal Distribution Transformer, which is insulated with double-wire package or round wire wrapped around the enameled wire.