Residual current device in reed switches and magnetoresistor for converter installation with transformer and rectifier

FIELD: electricity.

SUBSTANCE: device consists of a final element, a transformer of a converter installation consisting also of a rectifier which is connected to load, to the first, second, third, fourth, fifth, sixth, seventh, eighth, nineth reed switches with control windings, to the first, second, third, fourth, fifth, sixth, seventh, eighth, nineth reed switches with no windings, wherein the first (fourth, seventh), second (fifth, eighth), third (sixth, nineth) reed switches with control windings are located in the AC magnetic field of current leads in Line A, B, C of the converter installation respectively, as well as the first (fourth, seventh), second (fifth, eighth), third (sixth, nineth) reed switches without windings, the first gauge unit with DC control power supply designed as Wheatstone bridge wherein a magnitoresistor is used as one of its ports and fixed in the DC magnetic field of the current lead in the converter installation and resistors as the rest of the ports, one Wheatstone bridge diagonal is used as outputs of the first gauge unit, and the other one is connected to the output of the DC control power supply, the second and the third gauge units configured in the same way as the first gauge unit, the first, second, third alarm units, the first, second, third control reed switches with control windings and the first, second, third adjustable resistors through which the control winding ends of the first, second and third, fourth, fifth and sixth, seventh, eighth and nineth reed switches are connected to the first outputs of the first, second, third gauge units respectively, the winding starts are connected to the second outputs of the first, second, third gauge units, the first tuning unit for magnetizing-current inrush designed as the first element "И", the first element "НЕ", the first, second, third elements "ВРЕМЯ", element "ПАМЯТЬ", the second, third, fourth, fifth, sixth, seventh, eighth, nineth tuning units for magnetizing-current inrush designed exactly the same as the first unit, the first, second, third comparing elements, the first, second, third, fourth, fifth, sixth diagnostic units, the second, third, fourth, fifth, sixth, seventh, eighth, nineth, tenth, eleventh, twelfth, thirteenth elements "И", the first, second, third, fourth elements "ИЛИ", where the first, third, fifth diagnostic units are designed as the fourth, fifth, sixth, seventh, eighth, nineth elements "ВРЕМЯ", the fourteenth, fifteenth, sixteenth elements "И", the second, third, fourth, fifth, sixth, seventh, eighth, nineth, tenth elements "НЕ", the second, fourth, sixth diagnostic units are designed as the tenth, eleventh, twelfth elements "ВРЕМЯ", the seventeenth, eighteenth, nineteenth elements "И", the eleventh, twelfth, thirteenth elements "НЕ".

EFFECT: improved device reliability.

2 cl, 5 dwg

 



 

Same patents:

Voltage regulator // 2555854

FIELD: electricity.

SUBSTANCE: invention is related to the area of electric engineering and referred to voltage regulators in automobiles. In order to reach the technical result of an increase in reliability and service life of the automotive alternator voltage regulator in the output cascade of the voltage regulator based on two or more parallel transistors, ballasting resistances switched to emitters of each output transistor are made as fuses of aluminium wire of the same diameters and length and shaped as arcs or loops oriented to different sides. Operating (blowing) current shall not be less than the maximum load current - current of the alternator excitation winding - and not more than 1.3 of the same maximum load current.

EFFECT: improving the reliability and service life of the automotive alternator voltage regulator.

5 cl, 2 dwg

FIELD: power engineering.

SUBSTANCE: if through current arises, a protection tripping relay (3) or a protection tripping relay (7) actuates and disconnects a load (6) and DC sources (1 and 2).

EFFECT: increased reliability.

1 dwg

FIELD: electricity.

SUBSTANCE: protection and diagnostic method for in-series thyristors lies in stoppage of control pulses delivery as a protective measure, performance of control over state of the thyristors against reverse voltage and operating temperature of valve coolers. In the method correct operation of communication lines is controlled by pulse-phase control system against feedback response, distribution of reverse voltage is measured in each operating cycle of the valve groups. When maximum allowable temperature of the valves is exceeded or rated value of reverse voltage distribution is decreased or in case of lost connection with the pulse-phase control system protective measures are taken by removal of pulses from all thyristor groups and cutoff of the converter from the network or by removal of control pulses only. By means of the analysis for reverse voltage distribution and operating temperature of thyristors an emergency failure due to the thyristor performance degradation is prevented. The device for protection and diagnostics is described for in-series thyristors.

EFFECT: improving protective functions and ensuring diagnostics for the three-phase rectifier with in-series connection of thyristors.

2 cl, 2 dwg

FIELD: electricity.

SUBSTANCE: preliminary studies by using a nonlinear model of the PWM power converter the following are determined: emergency amplitude ripple voltage at the inverter output, time periods in the pulse-width modulation amplitude between successive measurements of the voltage ripple on the output of the converter, which is minimally required for recognition of these changes of these measurement results, the factor considering the worst possible joint effect of inductance in the power converter circuit and power capacitors at the amplitude of the pulsations of the inverter output. In operation, the transducer measures the current ripple amplitude at the output, the result is stored. After each successive measurement of the amplitude of the output voltage ripple, the change of the amplitude is determined with respect to the value in memory. The result is corrected using the previously mentioned ratio. The change is compared with the adjusted alarm value, based on this comparison, is projected upon reaching emergency pulsation amplitude values, leading to an emergency mode. Forecasting is repeated after each new measurement of the amplitude of the output voltage ripple of the converter.

EFFECT: increased extent of algorithmisation of forecasting process for emergency modes of pulse width power converters.

4 dwg

FIELD: electricity.

SUBSTANCE: invention may be used to control an AC rectifier with distributed energy accumulators with three phase modules, which have accordingly one upper and one lower branch of valves, which are equipped accordingly with three electrically serially connected dipole subsystems (10). In accordance with the invention the failed subsystems (10) of a faulty branch (T2) of valves and the subsystem (10) of a good branch (T1) of valves of a faulty phase module (100), corresponding to the quantity of failed subsystems, are shorted, capacitor voltages (Uc) of remaining subsystems (10) of the faulty phase module (100), are increased in such a manner that their sum is equal to the sum of capacitor voltages (Uc) of subsystems (10) of the good phase module (100), and the subsystem (10) of good phase modules (100) are controlled as if before a failure of one subsystem (10). Therefore, at the outputs (L1, L2, L3) of the AC rectifier (102) with distributed energy accumulators (9) in case of a failure a symmetric system of voltages is produced with maximum amplitude.

EFFECT: generation of a symmetrical system of voltages in case of an accumulator failure.

6 cl, 15 dwg

FIELD: electricity.

SUBSTANCE: dynamic process is represented in the form of an ensemble of harmonics, every of which is a time row reflecting in a symbolic form the dynamics of the appropriate frequency component, stationarity of the process is identified from the moment, when in a continuous selection of values of the first harmonics 5% of these values are outside the range from zero to maximum value of this harmonic, and 95% of these values are inside this interval, for the stationary process by a combination of symbolic characteristics of all harmonics its type is calculated within a scenario of multiple increase of the period.

EFFECT: higher extent of algorithmisation of a process of identification of emergency modes of width-pulse converters of energy, aimed at practical application for higher reliability and safety of their functioning.

FIELD: electricity.

SUBSTANCE: device comprises a reverse sequence filter made on two intermediate current transformers (CT). Primary windings of the first intermediate CT are connected for a difference of currents of two phases, and the primary winding of the second one is connected into the third phase, the secondary winding of the first intermediate CT is connected to the first loading resistor and a resistor serially connected to a capacitor to form a phase-shifting circuit, and the middle point is connected with one of outputs of the secondary winding of the second intermediate CT loaded onto the second loading resistor, the second output of the secondary winding and a point of connection of the resistor and the capacitor being the filter output are connected to the input of a comparison element connected to the first threshold element, to the output of which via the "AND" element an execution protection element is connected, besides, the input of the execution protection element is connected via the "AND" element to the second threshold element, the input of which via a filter of the first harmonic is connected to a current sensor of a rectifier reverse circuit.

EFFECT: higher noise immunity and reliability.

3 cl, 5 dwg

FIELD: electricity.

SUBSTANCE: device for monitoring of high-voltage valve converter switch condition includes a unit of resistors, a unit of signals measurement, and power switches of the high-voltage valve are divided into two parts, forming a middle point joined to the common supply bus of the signals measurement unit. At one side from the middle point the current-limiting resistors are connected to the first outputs of the high-voltage valve power switches, and at the other side - to their second outputs. The first outputs of each resistor in the resistors unit are connected to the common supply bus of the signals measurement unit, and their second outputs are connected accordingly to the second outputs of the current-limiting resistors and inputs of the signals measurement unit, outputs of which are connected to the outputs of the optical transmitter. The device to monitor condition of the high-voltage valve converter switches comprises a temperature sensor, the body of which form a thermal contact with the power switch body.

EFFECT: reduction of consumed power and cost of device, simplification of design, expansion of functional capabilities.

6 cl, 2 dwg

FIELD: electricity.

SUBSTANCE: in the invention there implemented is diagram of electric control as to power at least by means of one power control device (201a-201c, 202a-202c) and at least one heat removal device (101a-101c). At that, at least one heat removal device (101a-101c) has thermal contact at least to one power control device (201a-201c, 202a-202c). Heat removal device (101a-101c) is switched to the specified constant electric potential (103a-103c) and is electrically insulated at least from one power control device (201a-201c, 202a-202c).

EFFECT: improving resistance to electric breakdown.

7 cl, 3 dwg

FIELD: electricity.

SUBSTANCE: in device for converter high-voltage valve condition monitoring, comprising units of high-voltage valve power keys condition monitoring by number of serially connected power keys, each unit of high-voltage valve keys condition monitoring comprises rectifier, resistor, also stabilitron and capacitor are included, connected in parallel to outputs of rectifier, unit of synchronisation, unit of delay and generation of pulses, with according time delays of pulses and key introduced between the second output of rectifier and the second input of optical transmitter arranged in the form of light diode, besides, control input of key is connected via unit of delay and generation of pulses with output of synchronisation unit connected by one input to input of rectifier, and by the second input - to the second output of rectifier, and optical receiver is arranged, for instance in the form of photodiode and is intended for all units of keys condition monitoring.

EFFECT: reduction of consumed power and cost of device, simplification of design, expansion of functional capabilities.

3 cl, 5 dwg

FIELD: integrated circuit protective circuits including those of potential type.

SUBSTANCE: proposed circuit designed for protecting switching transistor that controls electromagnet or valve in control unit of motor-car forced idle run economizer upon occurrence of short circuit through common bus or reduction of load resistance below definite value has ten resistors 2, 3, 5, 9, 23, 26, 27, 32 - 34, seven transistors 1, 4, 10, 13, 22, 28, 30, two electronic switches 19, 29, two current supplies 7, 24, one reference voltage supply 31, one dynamic D flip-flop 1`1, one multiplexer 14, two delay circuits 16, 20, two matching units 18, 21, one regulated voltage supply 25, one power supply 6, thee input buses 12, 15, and 17 for passing initial setting signal, input signal, and clock pulses, respectively, and one output bus 8.

EFFECT: reduced number of leads in protective circuit of integrated type; ability of controlling its on-operation delay time.

1 cl, 1 dwg

FIELD: phase-failure protection of three-phase loads.

SUBSTANCE: proposed control device for three-phase switch built around triacs connected to supply mains phase leads has diode group assembled of two diodes integrated by cathodes and thyristor, all connected through anodes to output terminals of switch, thyristor gate electrode being connected to control unit built around optocoupler whose photothyristor is connected through first limiting resistor to thyristor anode and light-emitting diode anode is connected through anode to cathodes of diode group and its cathode, to neutral bus through variable resistor and second limiting resistor; first and second control buttons; three phase optocouplers whose photothyristors are connected through respective limiting resistors to bridge amplifier output and input is designed for connecting to control junction of respective triac; light-emitting diodes of phase optocouplers are cumulatively interconnected in series, shorted out by second control button, and connected through anode of first light-emitting diode to cathodes of diode group and to first lead of first trigger control button connected by its second lead to cathode of diode whose anode is connected to one of supply mains phase leads, and cathode of third light-emitting diode is connected through load resistor to neutral bus.

EFFECT: reduced heat loss, enhanced reliability of device.

1 cl, 1 dwg

FIELD: protection of miscellaneous high-voltage converters.

SUBSTANCE: proposed high-voltage unit has two antiphase arms (one phase) of three-phase bridge converter (rectifier or inverter); used as semiconductor devices are power thyristors or diodes; newly introduced in checkup device are second measuring element and second pulse generator; primary windings of checkup device transformers in first and second antiphase arms of high-voltage unit are connected through respective measuring element to output of first pulse generator whose control input is connected to output of second pulse generator.

EFFECT: simplified design, enhanced economic efficiency of checkup device.

1 cl, 2 dwg

FIELD: automatic control systems for protecting high voltage adjustable rectifiers for powering gas cleaning filters in various industrial branches and in agriculture.

SUBSTANCE: on disruption of thyristors in ac to method, phase of load current impulse front φ is measured as well as thyristor key impulse front phase α, their difference is calculated and, when φ-α is greater than zero, signal is dispatched for disabling automatic switch in powering circuit of rectifier or value of duration of load current impulse T and duration of impulse of phase-shifting device generating impulses for controlling thyristor key t, are measured, value of their difference is computed and, if T-t is greater than zero, signal is formed for disabling automatic switch in power circuit of rectifier.

EFFECT: increased efficiency.

2 cl, 1 dwg

FIELD: electric engineering, possible use in autonomous electric supply systems of spacecrafts for supplying power to consumers from limited power supply, such as a solar battery.

SUBSTANCE: in accordance to the invention, constant voltage regulator contains input and output clamps for connecting power supply and load, metal-dielectric-semiconductor transistor, connected in parallel to output clamps, and dividing Schottky diode, installed between same name poles of input and output clamps. Second metal-dielectric-semiconductor transistor with control driver is introduced serially with dividing Schottky diode. Threshold device is introduced additionally, input of which is connected in parallel to dividing Schottky diode, and output - to controlled input of control driver.

EFFECT: increased reliability of operation of charge-discharge device due to ensured protection of power supply circuits and accumulator battery from short circuits in separate cells.

1 dwg

FIELD: electric engineering, possible use for controlling three-phased asynchronous electric motors of down-pumps, used mainly for oil extraction.

SUBSTANCE: in the method for controlling the three-phased asynchronous electric motor of down- pump and in the system for controlling electric motor of down-pump in case of failure of frequency regulator or jamming of electric motor rotor, by means of mode switch, mode of direct launch from electric network is set. In that mode transfer of electric energy to electric motor occurs via chain: three-phased electric network - increasing voltage transformer - three-phased asynchronous electric motor. The control system contains a frequency control circuit and direct launch circuit, first key, connected to frequency controller and controlling feeding of power to it; input and output filters, second key, by means of which control modes are switched, third key, controlled by controller, and transformer which increased power voltage of electric motor.

EFFECT: increased efficiency.

2 cl, 4 dwg

FIELD: electrical engineering; no-break power supply to responsible industrial and military transient-load consumers.

SUBSTANCE: proposed parallel redundant-architecture DC converter characterized in enhanced stability to switching pulse noise has (N + 1) similar DC/DC modules. Each DC/DC module incorporates microcontroller control system. DC/DC module control systems incorporate provision for data exchange over bus, type CAN-bus, and equally perform their functions, that is, they are not separated according to "Drive control system" and "Driven control system" criteria. Unique identical algorithms implemented in all microcontroller systems of DC/DC modules equally performing their functions provide for transfer of one of these modules (at rated load) to stand-by mode, uniform distribution of transient load among parallel-running DC/DC modules, automatic throw of stand-by DC/DC module in operation in case load rises above rated value or one of DC/DC modules fails, and informant peripheral control systems about occurrence of failure in converter and, hence, about its operation without stand-by power support. Failure message received by peripheral control system enables attending personnel to adequately respond to situation by recovering trouble-free operation of converter under redundant-power condition.

EFFECT: enlarged functional capabilities, uniform load distribution among parallel-running converter channels, enhanced load-carrying capacity and failure tolerance.

3 cl, 4 dwg

FIELD: protection of strong-current thyristor converter.

SUBSTANCE: maximal admissible meaning of referred value if converter's input current by maximal admissible meaning of converter's input current. Range of values of switch-off current of high-speed switch is preset on base of range of values of derivative of output current of converter. Maximal meaning of value of switch-off current of high-speed switch within that range corresponds to zero meaning of value of derivative of output current of converter and minimal meaning corresponds to maximal admissible meaning of value of switch-off current of high-speed switch of converter in such a way that minimal meaning of switch-off current within that range coincides with maximal admissible value of referred value of converter's input current. Values of output current of converter and of its derivative are put under control and high-speed switch is switched off when input current of converter reaches values of switch-off current belonging to specified range.

EFFECT: ability of keeping thyristor converter working in emergency operation.

1 dwg

FIELD: protection of strong-current thyristor converters.

SUBSTANCE: value of derived input current of blocking of control pulses is specified by maximal admissible value of input current of converter. Values of input and output currents of converters are controlled as well as derivative of converter's output current. Range of values of switch-off current of high-speed switch is preset on base of range of values of derivative in such a manner that mentioned meaning of derived value belongs to that range. Minimal meaning of output current of switching-off within that range corresponds to maximal value of derivative of output current of converter. Signal for additional blocking of control pulses is introduced when those values of derivatives of output current of converter are achieved, which values correspond to values of mentioned switching-off current that lies lower than mentioned above value of derived value. Control pulses are blocked when admissible value of output current of converter is exceeded or by signal introduced. After signal for additional blocking of control pulses is introduced, high-sped switch is switched off with time delay being equal or bigger than cut-off time of thyristor converter.

EFFECT: improved reliability of operation; higher speed of switch off; elimination of burning of power terminals; reduced hazardous heat and electrodynamic influence of super high currents in case of alarm switch-off.

1 dwg

FIELD: electricity.

SUBSTANCE: in device for converter high-voltage valve condition monitoring, comprising units of high-voltage valve power keys condition monitoring by number of serially connected power keys, each unit of high-voltage valve keys condition monitoring comprises rectifier, resistor, also stabilitron and capacitor are included, connected in parallel to outputs of rectifier, unit of synchronisation, unit of delay and generation of pulses, with according time delays of pulses and key introduced between the second output of rectifier and the second input of optical transmitter arranged in the form of light diode, besides, control input of key is connected via unit of delay and generation of pulses with output of synchronisation unit connected by one input to input of rectifier, and by the second input - to the second output of rectifier, and optical receiver is arranged, for instance in the form of photodiode and is intended for all units of keys condition monitoring.

EFFECT: reduction of consumed power and cost of device, simplification of design, expansion of functional capabilities.

3 cl, 5 dwg

Up!