ugg italia ABB High Power AC - AC frequency conver

ABB High Power AC - AC frequency converter

Commission should immediately trip. In exceptional circumstances, the failure rate from the rate on the position encoder to the actual worth. (4) motor with closed loop ventilation, so by PT10 (I component to measure the motor cooling air temperature. In the motor at both ends of the inlet and outlet are equipped with temperature measurement devices, when the air temperature abnormal situation, through the fault display an alarm signal and delay the trip, this approach only with closed loop air cooling system of the motor force. In summary, synchronous motor protection relay through the transient over-current protection function. current trip with a quick the motor short circuit protection, current delay of the short trip for motor overload protection, thermal protection for motor overheat protection. overcurrent relay the value of the thermal protection action with two time constants from the thermal model to determine the heat model to simulate the temperature rise characteristics of the motor. current protection switch immediately quick trip, but the current trip protection and delayed motor thermal protection is required to adjust the delay in the arrival time after the switch to make the trip,[link widoczny dla zalogowanych], the relay protection equipment used a pre-alarm contacts, when the over-current contacts appeared immediately in the action, send a signal to the control system in order to trip the circuit breaker before the current control system has enough time to brake control. multifunction relays can be added without balance the load protection for a number of occasions with special needs: the system of dual excitation transformer winding structure. the one-side switch lead through their A network,[link widoczny dla zalogowanych], input AC voltage 400V rated A for a 600V, it has the following protection: the first 1 Shengpei Xing, etc.: ABB to pay for a high-power AC variable frequency device (1) short-circuit protection, transformers with short circuit protection delay relay delay time of about 3130ms, this time to ask enough to escape that may occur when starting gate Taiwan inrush current, (2) the secondary winding of each are equipped with a thermal relay for overcurrent protection (3) If the use of oil immersed transformers, then equipped with a PTI [30 components and a thermometer with contacts for temperature protection, if the use of dry-type transformer,[link widoczny dla zalogowanych], is applied to replace PT10o thermistor element (4) excitation transformer secondary side as well with over-voltage, ground fault protection relay. exciter converter also uses the necessary protection: ① in each SCR are equipped with fast-acting short circuit protection, fuse signal sent when the fuse immediately after the interrupt system work. ② When the SCR overtemperature occur within the phenomenon of the bridge, the control system will be based on the type of alarm signal temperature or trip signal. ③ synchronous motor excitation circuit is also set to \by a group composed of anti-parallel thyristor switch and trigger circuit through the BOD, the converter output group (+) (a) of the pole across a resistor to limit current flow through the switch. excitation maximum permissible winding synchronous motor voltage is 1900V and the excitation of the rotor is also equipped with a transformer secondary, as the cable grounding busbar protection. rotor and stator thermal protection using the same thermal protection relay and the thermal model. 51 In addition,[link widoczny dla zalogowanych], the rotor also used within the indole Road, ~ a separate overcurrent relay. Use the software to protect the rotor circuit, monitor the software by measuring Ur, lr, and the temperature to calculate the stator temperature of the rotor winding temperature average temperature of earth fault protection, the general network with high impedance grounding system to detect. change an AC variable frequency inverter and synchronous motor drive system composed by a synchronous motor windings are star connected transformer with separate secondary windings, ground fault monitoring for motor stator, inverter and transformer secondary winding and so on. monitoring device is an earth fault monitoring relay, the relay is designed as a thyristor inverter can be used for the network to provide a network rectangular low-frequency transition, if there is ground fault occurs, the current put through the application of the circuit was detected too much power to pay a 5 AC frequency converter, AC motor drive system has been widely used, especially in high-power, low-speed where the application of more extensive transmission; metallurgical industry strip hot rolling mill, whether it is half full or rolling mill, but also whether or finishing mill roughing mill, if the power of 1000kW or more, the current one would prefer to use AC variable frequency AC AC motor drive power supply unit. because the transmission system both in technical and economic indicators, or in the maintenance workload to be better than the DC motor drive system in the strip in cold rolling mill,[link widoczny dla zalogowanych], whether or reversing mill mill , for these same reasons, the current also choose to pay a variable frequency AC motor drive AC power supply unit. contributions Date: 19984) 8-10

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