Device for control of three- and one-phase loads through power four-wire mains. RU patent 2516218.

IPC classes for russian patent Device for control of three- and one-phase loads through power four-wire mains. RU patent 2516218. (RU 2516218):

H02J3/24 - Arrangements for preventing or reducing oscillations of power in networks (by control effected upon a single generator H02P0009000000)

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Invention is attributed to the field of electric engineering and can be used for improving dynamic stability of electric-power systems and for damping electromechanical vibrations of generator rotor. In the method for improving dynamic stability and vibrations damping, alternating current synchronous generator rotor speed is monitored and synchronous generator rotor speed is lowered after insertion disturbance into system up to the rotation rate of magnetic field by means of mechanical deceleration of mentioned generator rotor. Electromagnetic brake is mechanically linked with generator rotor and prime mover rotor via clutches, voltage on generator terminals and generator stator current is continuously measured by which parameters the generator electromagnetic power is determined. This power is compared with electromagnetic power value which existed before insertion of disturbance. When result of power comparison exceeds predefined value, control signal for electromagnetic brake switching on is generated. The value of decelerating torque is determined by difference between values of the measured electromagnetic power and the electromagnetic power which existed before disturbance insertion, and duration of decelerating torque application is determined by change in generator rotor speed. To do this the generator rotor speed after disturbance insertion is determined and compared with the value which existed before disturbance insertion. Electromagnetic brake is switched off when equality of current rotor speed and rotor speed in mode before disturbance is reached and when measured power is equal to the power which existed before disturbance insertion.

Method and device for electrical transmission system / 2406207
Device is designed to reduce subsynchronous resonance in electrical transmission systems and includes facilities (16), (17) to define voltage components from the side of stator windings in generator (9) with one or more discrete frequencies and calculation means taking into account the results of the said calculations, voltage to be added to the specified voltage of stator windings to reduce subsyncronous resonance in electrical system and a circuit (20) configured so that calculated voltage can be added to the specified voltage of stator windings.

Emergency control method of power of turbine generator of modular thermal power station (versions) / 2412512
As per the first version of the method there measured is output current and output voltage of turbine generator, active power is determined according to them, controlled and compared with reduction speed set points of active power and output voltage, and emergency imbalance of active power is calculated and compared to the set point. As per the second version of the method, the rotor speed is measured, rotor slip is determined relative to synchronous rotation speed and exceedance is controlled with the slide of the specified positive set point. As per the first and the second versions of the method, when set points are exceeded, there formed is pulse control impact on the turbine off-loading. As per the third version of the method, frequency of output voltage, rotor speed and flow of live steam before turbine is measured; negative rotor slip is determined relative to synchronous rotation speed, current power reserve of turbine is determined, exceedance is fixed with current turbine power reserve and with absolute value of rotor slip of the appropriate set points, and when frequency of output voltage is decreased to its set point, there formed is control impact on additional loading (forcing) of turbine, which is proportional to current reserve of its power.

FIELD: electricity.

SUBSTANCE: invention is related to the field of electric engineering and, in particular, to control of pump units and can be used for alternate control of three- and one-phase loads through the power four-wire mains. The device contains at the power line input a protective device, a three-phase solenoid starter connected to the three-phase load connected at the line end and three wye-connected capacitors with an artificial earthing point are connected to the outputs of the starter; at the line beginning there is an ambient temperature sensor connected to a one-phase solenoid starter which contact is connected in parallel to one phase of the three-phase solenoid starter and at the line ending there is a heater switched on between a neutral wire and the artificial earthing point of three capacitors.

EFFECT: possibility of skipping control cable during layout, refusal from switching devices in harmful environment.

1 dwg

The invention relates to the electrical engineering, in particular to control pumping units with heating pipes.

A device (A.S. 1064375 H02J 13/00) for remote control of three-phase electric motor pump unit containing a protective device and magnetic starter at the entrance of a transmission line at the end of which is connected to three-phase motor, and between one phase and zero wire resistor.

The disadvantage of this device is the need for a transformer of a current of zero sequence to control the actuator and the impossibility of controlling three-phase loads at different times.

The closest to offer is chosen as a prototype, the motor protection device for zero-sequence voltage using the connection diagrams artificial star three capacitors (S.A. Grundulis. Protection of electric motors in agriculture. 2-e Izd., Rev. and supplementary): Agropromizdat, 1988. p.30, Fig.7). The device contains a protective device, push-button station, three-phase magnetic starter, connected to three-phase electric motor, the findings of which is connected with the three condenser United into a star with artificial zero-point between artificial zero zero wire enabled voltage relay.

The disadvantage of this device is the inability to control at various times three-phase motor and a single-phase load.

The problem is solved in that the device for controlling three-phase loads on power wire networks containing input power transmission lines, protective apparatus of three-phase magnetic starter, coupled with attached at the end of the line three-phase load, the findings of which is connected with the three a capacitor connected in a star with artificial zero point, according to the proposed device was introduced in the beginning of the line outdoor temperature sensor connected to single-phase magnetic starter, contact, which are parallel to contact one of the phases of a three-phase magnetic starter, and in the end of the line - heater included between zero wire and artificial zero point three capacitors.

The proposed device is aimed at expanding the functional possibilities by including single-phase load off of three-phase electric motor when the temperature of the environment.

The proposed device (see drawing) contains protective equipment - 1, three-phase magnetic the starter - 2 connected via a power line - 3-phase load - 4, the findings of which is connected with the three capacitor - 5, United into a star with artificial zero point - 6, between artificial zero point - 6 and zero wire - 10 included heater - 9, the external sensor temperature - 7 included before-phase magnetic starter - 8, contact, which are parallel to contact one of the phases of a three-phase magnetic starter - 2.

Does the proposed device as follows. When you enable protective device - 1 and three-phase magnetic starter - 2 by line 3, and three capacitors - 5 currents, the amount of which is equal to zero, so after single-phase load to 9, no current flows. Capacitive currents of three capacitors - 5 provide compensation of reactive power of three-phase load - 4. Disabling a three-phase loads - 4 three-phase magnetic starter - 2, when the ambient temperature is below the target, the ambient temperature sensor - 7 and includes single-phase magnetic starter - 8, through his contact in one of the phases line, 3 - capacitor - 5 and single-phase load is 9 current flows, providing heating of the object.

The proposed device is aimed at expanding the functional possibilities by including single-phase load disabling three-phase electric motor when the temperature of the environment, allows to refuse from the control cables between actuator and three-phase load (for example, pumps) and to manage alternately three-phase and single-phase loads in four power lines.

Device for control of three-phase and single-phase loads on power wire networks containing input power transmission lines, protective apparatus of three-phase magnetic starter, coupled with attached at the end of the line three-phase load, the findings of which is connected with the three capacitor connected in star with artificial zero point, wherein is introduced in the beginning of the line outdoor temperature sensor connected to single-phase magnetic starter, contact, which are parallel to contact one of the phases of a three-phase magnetic starter, and at the end of the line - heater included between zero wire and artificial zero point three capacitors.