TSJA 3 Phase Oil-Immersed Variable Voltage Transformer Pure Copper Wire

TSJA 3 Phase oil-immersed variable voltage transformer induction adopts the structure of rotor, silicon steel sheet, coil, worm gear, motor drive and heat dissipation pipe. It adjusts the phase angle through mechanical transmission to change the secondary side voltage. It should be noted that this type of variable voltage transformer itself does not have the function of voltage stabilization. Compared with the contact type transformer, although the induction variable voltage transformer has larger self-loss, lower voltage precision and higher starting voltage, it has excellent performance in overload and overcurrent resistance, so it is widely used in motor blocking, chemical fertilizer production, steelmaking, electroplating and other large-scale heavy industry testing fields.

Main technical parameter

Structure and working principle

The structure of TSJA 3-phase induction variable voltage transformer is similar to that of wire-wound induction motor, but its rotor is fixed by worm gear and cannot rotate freely, so it can be adjusted manually or electrically to achieve the required angle. Its electromagnetic relationship is similar to that of an autotransformer.

The 3-phase rotor winding of the variable voltage transformer is connected in a star shape as the primary side and is connected to the three-phase power supply through three slip rings and carbon brushes. The three-phase stator winding serves as the secondary side, where one end of each phase winding is connected to the corresponding end of the rotor winding and the other end is connected to the load.

When the rotor winding is connected to a symmetrical 3-phase power supply, a rotating magnetic field is generated in the air gap, which is the same as the operating principle of a three-phase induction motor. Under the action of the rotating magnetic field, both the stator winding and the rotor winding induce an electric potential. Due to the series connection, the secondary side terminal voltage is the sum of the two potentials. Since the position of the stator winding and rotor winding can be changed, the phase relationship of the potentials in the two windings will be different depending on the position of the rotor.

Performance Characteristics

This product can operate stably for a long time under the following conditions:

· chemically corrosive gases and vapors free

· Gas environments without risk of explosion

· temperature rise of oil surface not exceeding 55℃ (maximum temperature of oil surface not exceeding 95℃ when the surrounding medium temperature is 40℃), temperature rise of winding not exceeding 65℃, temperature rise of core not exceeding 80℃

· Temperature range of surrounding medium: +40°C to -25°C

· Relative humidity not exceeding 85%

· Altitude not exceeding 1000 meters above sea level

Instructions for use

Wiring: single-phase variable voltage transformer A, X terminal for the input, a, x terminal for the output; three-phase variable voltage transformer A, B, C terminal for the input, a, b, c terminal for the output, O terminal for the star (Y-shaped) neutral point.

Debugging: newly installed or long unused variable voltage transformer, before operation must use 500V megohmmeter insulation test, qualified before safe use. If the test is not qualified, need to be hot drying treatment, usually using the charged drying method or send drying room. After drying, check whether the fasteners are loose, if loose need to be tightened.

Grounding: the variable voltage transformer must be well grounded to ensure safety.

Parallel use: shall not be used in parallel.

Voltage limitation: The input voltage must not exceed 105% of the rated voltage (i.e. 105% U rated input) to avoid damage to the variable voltage transformer or other equipment. When not in use, the output voltage should be adjusted to 0V and the input power should be cut off.

Rated current: the rated power supply of the variable voltage transformer is the output current of the variable voltage transformer. Calculated as follows: I2 = P2UomaxI2 = \frac{P2}{Uo_{\text{max}}}I2=UomaxP2 where I2 is the rated output current, P2 is the rated capacity, Uo_max is the maximum output voltage. It should be noted that the output current should not exceed the rated value. Short-time overload should be controlled within the range specified in Table 3, otherwise it may shorten the life of the variable voltage transformer or even lead to damage.

Operation: The handle should be rotated slowly and evenly during adjustment to avoid damage to the brushes or sparks.

Brush maintenance: regularly check the brush wear, if there is excessive wear or defects, the brush should be replaced in time with the same specifications, and use zero-grade sandpaper pads to rotate the handwheel under the brush, so that the brush grinding surface is flat to ensure good contact. Replacement of copper-graphite composite brushes must meet the specifications.

Cleaning: The contact surface between the coil and the brush needs to be kept clean to avoid sparking or burning the coil. If black spots are found on the coil surface, wipe with 90% alcohol.

Wires: The wires and terminals from the power supply to the variable voltage transformer, and from the variable voltage transformer to the load should be in good contact and be able to withstand the rated current of the variable voltage transformer.

Handling: the variable voltage transformer should be handled with a carrying handle, avoid lifting with a hand wheel.

Mounting: When the variable voltage transformer needs to be mounted horizontally on a panel (unit variable voltage transformer construction only), or upright on another base, it can be secured using the mounting holes in the variable voltage transformer base.

Keep clean: the inside of the variable voltage transformer should be kept dry and clean, no water droplets, oil and other contamination is allowed. Periodic power outages to remove internal dust accumulation.