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Shenzhen Fuyong professional emergency repair Transformer Yingtong power reliability

Shenzhen Fuyong professional emergency repair Transformer Yingtong power reliability

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Shenzhen Fuyong professional emergency repair Transformer Yingtong power reliability

advantages and disadvantages of transformer neutral point grounding system: advantages: for the power supply neutral point grounding system, if a single-phase grounding occurs, the other two-phase voltage does not rise, In this way, the insulation level of the whole system can be reduced. In addition, single-phase grounding will produce a large short-circuit current is, so that the protection devices (relays, fuses, etc.) can act quickly and accurately under normal circumstances, which improves the reliability of protection. Disadvantages for the neutral point grounding system of the power supply, due to the large single-phase short-circuit current, switches and electrical equipment should be selected with large capacity, which can also cause system instability and interference with communication lines; Shenzhen Yingtong Power Technology Co., Ltd_ Shenzhen transformer maintenance_ Shenzhen voltage regulator_ Shenzhen transformer

transformers are often seen in our life. Using transformers to stabilize the voltage can help us use electricity safely and protect the safety of electrical appliances at home. In fact, there are many types and specifications of transformers. Different specifications of transformers have different meanings. Our common transformer, such as dry-type transformer, is scb10-1000kva/10kV/0.4kV. The meaning of dry-type transformer is that s represents that this transformer is a three-phase transformer to better serve the social device. If s is replaced by D, it means that this transformer is a single-phase transformer. And C means that the transformer winding is a resin cast solid, that is, a dry-type transformer. B refers to foil winding. If B is replaced by R, it refers to wound winding. If l, it refers to aluminum winding. If Z, it refers to on load voltage regulation. If it is copper, it is not marked. 10 indicates the design serial number, also known as the technical serial number. 1000KVA refers to the rated capacity of this transformer (1000 kVA). 10kV means primary rated voltage, and 0.4kV means secondary rated voltage. Next, Shenzhen Yingtong power will introduce transformer maintenance, precautions for transformer operation, abnormal phenomena of transformer and their causes

how to choose the reactor for frequency converter

how to choose the reactor for frequency converter? Next, the selection of rated AC current, voltage drop, inductance, inductance of corresponding rated current and cable length are analyzed

1 . Selection of rated AC current

rated AC current is the long-term working current of the reactor designed from the aspect of heating, and sufficient high-order harmonic components should be considered at the same time. That is, the actual current flowing through the output reactor is the output current of the inverter motor load

2. Voltage drop

voltage drop refers to the actual voltage drop at both ends of the reactor coil corresponding to the actual rated current at 50Hz. Usually, the voltage drop is about 4v~8v

3. Selection of inductance

rated inductance of reactor is also an important parameter! If the inductance is not properly selected, it will directly affect the change of voltage drop under the rated current, resulting in faults. The inductance depends on the cross-sectional area of the reactor core, the number of turns of the coil and the adjustment of the air gap. The inductance of the output reactor is determined according to the cable length within the rated frequency range, and then the cross-sectional area of the iron core and the cross-sectional area of the wire under the corresponding inductance requirements are selected according to the actual rated current of the motor, so as to determine that the actual voltage drop with the accuracy required by the flexible packaging can be achieved by adopting the general lead screw and T-shaped lead screw

4. Inductance corresponding to rated current and cable length:

cable length rated output current inductance

300 meters 100A 46 h

200A 23 h

250A 16 h

300A 13 H

600 meters 100A 92 h

200A 46 h

250A 34 h

300A 27 h

the ideal reactance should remain unchanged at or below the rated AC current. With the increase of current, the inductance the amount gradually decreases

when the rated current is greater than 2 times, the inductance is reduced to 0.6 times of the rated inductance

when the rated current is greater than 2.5 times, the inductance is reduced to 0.5 times of the rated inductance

when the rated current is greater than 4 times, the inductance is reduced to 0.35 times of the rated inductance

characteristics of winding denaturation (1) deformation affected by electrodynamic force. 1) The high-voltage winding is in the outer layer, and is subject to axial tensile stress and radial tensile stress, which makes the pressure nails at the end of the winding loose and the cushion blocks fly out. In serious cases, the iron yoke clamp, pull plate and fastening steel belt will be bent and deformed, and the height of the winding will increase after relaxation. 2) When the middle and low-voltage windings are located in the inner column or in the middle, they are often affected by axial and radial compression forces, which loosen the fastening screws at the end of the winding, displace the cushion block, tilt the brace, and twist the wire handle in a polygon in the radial direction. 3) The wire handle in the winding tapping area and rectifying area is deformed. 4) Winding leads are displaced and twisted. (2) Deformation affected by mechanical force. That is, the overall displacement and deformation of transformer winding. This kind of deformation is caused by the sudden braking of transportation vehicles and the impact and shaking of cargo transportation ships during transportation. Shenzhen transformer maintenance mainly taught the structure, product performance characteristics and quality advantages of the Extrusion board production equipment of gamma company. Yingtong power - high efficiency_ 24-hour emergency repair - professional Longgang transformer maintenance Shenzhen Fuyong professional emergency repair Transformer Yingtong power is reliable