In this modern power society, we always use electricity, and our ability to use electricity without hindrance also requires layer-by-layer processing, and we need to know that electricity is often transmitted to areas of electricity use, but This technology is very difficult in the process of transmission. At this time, we need to use special equipment. This equipment is a transformer. Now we find that Siemens transformers are used in many transformers. What are the Siemens transformers? What is the characteristic? What is the classification of the transformer?
Features of Siemens transformers:
1. Targeted design with low loss.
2, high resistance to short circuit, good mechanical strength.
3, low PD, low failure rate, long life.
4, low noise, oil leakage.
5, easy to install, maintain, good mechanical strength.
The working principle of the transformer:
The working principle of the transformer is to work on the principle of electromagnetic induction. The transformer has two sets of coils. Primary coil and secondary coil. The secondary coil is outside the primary coil. When the primary coil is connected to alternating current, the transformer core generates an alternating magnetic field, and the secondary coil generates an induced electromotive force. The turns ratio of the coil of the transformer is equal to the voltage ratio. For example, the primary coil is 500 turns, the secondary coil is 250 turns, the primary pass is 220V AC, and the secondary voltage is 110V. The transformer can step down and boost. If the primary coil is smaller than the secondary coil, it is a step-up transformer that can raise the low voltage to a high voltage.
Transformer loss:
When the primary winding of the transformer is energized, the magnetic flux generated by the coil flows in the core. Since the core itself is also a conductor, an electric potential is induced on a plane perpendicular to the magnetic field line. This potential forms a closed loop and generates a current on the cross section of the core. It seems to be a vortex and is called "vortex." This "vortex" increases the loss of the transformer and increases the temperature rise of the transformer's core heating transformer. The loss caused by the "eddy current" is called "iron loss". In addition, a large number of copper wires are required to wind the transformer. These copper wires have resistance. When the current flows, the resistor consumes a certain amount of power. This loss is often consumed as heat. We call this loss "copper loss". . Therefore, the temperature rise of the transformer is mainly caused by iron loss and copper loss. Since the transformer has iron loss and copper loss, its output power is always less than the input power. For this reason, we introduce an efficiency parameter to describe this, η = output power / input power.
The main functions of the transformer are:
1, voltage conversion, 2, current conversion, 3, impedance transformation, 4, isolation, voltage regulation (magnetic saturation transformer).
Classification of transformers:
1, power transformers. Including: (1) step-up transformer. (2) Step-down transformer. (3) Distribution transformers. (4) Contact the transformer. (5) Transformers used in the factory or used.
2. Instrument transformer. Such as current transformers, voltage transformers, as measurement and protection devices.
3. Electric furnace transformer. There are steelmaking furnace transformers, voltage furnace transformers, and induction furnace transformers.
4. Test the transformer.
5. Rectifier transformer.
6, voltage regulator transformer.
7. Mine transformer (explosion-proof transformer).
8, other transformers.
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