IGBT Rectifier input power distribution system
In the data center of the UPS power supply system, the input circuit is one of the most important indicators of input power factor. A low input power factor can cause adverse effects:
(1) lead to input IGBT Rectifier power supply lines on all aspects of the old paintings
The reason why the input power factor is low is that the input harmonic current component content is large, the harmonic current through the input cable, the cable generates additional heat, resulting in long-term heat of the cable material, soft, brittle, crisp, broken; When the current flows through the input circuit breaker (switch), the switching point due to long-term heat caused by poor contact, a positive feedback effect is the switch premature aging; harmonic current through the input fuse, due to long-term additional heat caused by fuse Softening, drooping (so that the entire fuse thickness becomes uneven), natural fracture caused by power.
(2) IGBT Rectifier can not make full use of input power
As the input power contains a large number of reactive components, active power is absorbed, reactive power in the cable reciprocating flow, the normal effective current channel narrowing, due to the line "crowded" and the unit cross-sectional area of the current density Large, power consumption increased. According to Ohm's law. The power consumption on the wire is P
IGBT Rectifier mainly by the coil, iron core, insulation materials, PC board, electronic components, plastic shell, etc. constitute its basic structure.
1.IGBT Rectifier normal operation, do not need someone on duty.
2.IGBT Rectifier should be avoided in the case of no-load disconnect the AC switch, stop running, you should first disconnect the AC switch, after the DC switch.
3. Traction substation sub-network side and DC side to be set up arrester to suppress lightning overvoltage
4. The current setting of the AC switch should avoid the inrush current of the rectifier transformer.
5. Do not allow the door to run.
6.IGBT Rectifier put into operation, such as humidity, condensation occurs, with a blower to exclude traction substation moisture.
7. When the IGBT Rectifier fails, the operator should be removed after the failure to close, otherwise it may expand the scope of the accident, resulting in greater losses.
8.IGBT Rectifier should be kept clean, the rectifier tube cover and the fouling on the insulator should be removed every month.Using the wind blower, the soft cloth to remove the fouling, and can not use the silk, brown brush, because the residual wire, Short circuit.
IGBT Rectifier, is a thyristor (power electronic power devices) as the basis, to intelligent digital control circuit as the core of the power power control appliances. With high efficiency, no mechanical noise and wear, fast response, small size, light weight and many other advantages.
IGBT Rectifier features: is "explosive". However, if the anode or the control electrode is the reverse voltage, the thyristor can not turn on. The effect of the control electrode is to turn on the thyristor by applying a positive trigger pulse, but it can not turn it off. So, what method can the turn-on thyristor turn off? Turn the thyristor off, turn off the anode power (switch S in Figure 3) or make the anode current less than the minimum value Maintain current). If the thyristor anode and cathode are added between the AC voltage or pulsating DC voltage, then the voltage zero, the thyristor will turn off.
Since the advent of the 1950s has developed into a large family, IGBT Rectifier its main members are unidirectional thyristor, two-way thyristor, light-controlled thyristor, reverse thyristor, can turn off the thyristor, fast thyristor, and so on. Today, we use a single-way thyristor, which is commonly known as ordinary thyristor, which is composed of four layers of semiconductor materials, there are three PN junction, the external three electrodes: the first layer of P-type semiconductor leads to the electrode called anode A , The third layer of P-type semiconductor leads the electrode called the control electrode G, the fourth layer of N-type semiconductor leads the electrode called the cathode K. From the thyristor circuit symbol can be seen, it is the same as the diode is a one-way conductive device, the key is more than a control pole G, which makes it with the diode is completely different from the operating characteristics