Device for monitoring of converter high-voltage valve condition

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

 

The invention relates to the field of electrical engineering, and in particular to circuits of the control and protection of the transducers, and can be used to control the state of the semiconductor switches in high voltage converters with voltage 3-15 kV.

A device for control of high-voltage thyristors of the valve (RU # 1445501 priority from 30.03.1987)adopted for similar, containing the voltage sensors on the number of thyristors in high voltage valve, connected inputs to the respective thyristors, and exits through the optical fibers to the power converting light signals into electrical connected to the outputs with the inputs of the system of information processing and protection. Each fiber is equipped with optoporation and optipranolol.

The disadvantages of this device are the design complexity and high cost of the device, caused by the necessity of using a large number of optoporation and optipranolol with optical fibers (optical fibers), as well as a large number of channels in the block converting light signals into electric and complex scheme of their further processing.

The closest analogue, taken as a prototype of the proposed invention is a device for monitoring high-voltage gate drive device of smooth start high voltage output the I series EBPVD - VM (catalog "Motorized equipment" ABS Holdings, September 2007). Figure 1 shows the schematic diagram of the prototype, where position 1 is sequentially enabled power switches high-voltage valve. The device includes a control state of the power switches - 2 by the number of power switches in high voltage valve, otoplenie - 3 by the number of power switches high-voltage gate connected to the input device control and protection of the inverter 4, each of the control units state power switches - 2 contains the rectifier has 5 inputs connected through a resistor to 6 parallel power key high-voltage gate - 1, the current regulator 13 and orthopaedic - 14, interconnected in series and connected at the conclusions to the outputs of the rectifier 5. The outputs of optoporation 14 are connected with inputs of optipranolol 3 optical fiber 15.

Alternating current limited by the resistor 6, is rectified by the rectifier 5 and flows through the current regulator 13 to the input of orthopaedica 14. Light signals from optoporation 14 through the optical fiber 15 is coming to otoplenie 3. The output electrical signals of optipranolol 3 are received at the inputs of device management and security 4 starters (hereinafter - protection device). The protection device 4 monitors the status (health) of all power CL is whose high-voltage gate 1 and enables or disables the management.

The device EBPVD-VM operates at the supply voltage of 6 or 10 kV. In operation, the voltage on the power key high-voltage valve is changed from zero to about 2,5 kV, which significantly changes the current through orthopaedic. In this device compared to similar current orthopaedica limited by current regulator that increases the resource of orthopaedica.

The disadvantages of this device are:

- large power consumption. This disadvantage stems from the fact that ortopedici operate in a continuous mode, and the resistors are allocated large power loss;

- the design complexity and high cost of the device, due to the use of expensive optipranolol, optoporation and fiber for transmitting signals from the control units state power switches to the protection device;

- limited functionality: does not allow control of arcing in high voltage valve. Because the device does not contain an open optical channel to perform this function, if the damage is in the design of high-voltage valve or the occurrence of an electric arc does not have a corresponding signal (information about the accident for a timely disable soft starters.

Technical rez is lthat of the claimed device the reduction in power consumption and cost of the device, simplifying the design, functionality.

The technical result is achieved in that in a device for monitoring high-voltage valve of the Converter containing the control units state power switches high-voltage valve according to the number of series-connected power switches high-voltage valve, orthopaedic, the output connected to the input of the control and protection of the Converter, each block status control power switches high-voltage valve contains a rectifier connected to the input through a resistor parallel to the power key, and orthopaedic, one output connected to the first output of the rectifier entered in each block status control power switches high-voltage valve parallel connected outputs of the rectifier diode and a capacitor, the node synchronization, the node delay and pulse shaping with appropriate time delays and the key entered between the second rectifier output and the second output orthopaedica made in the form of LEDs, and the control input of the key is connected via the node delay and pulse shaping to the output of the synchronization host connected to one input to the input rectifier and the second input with the second output ViPr is mites, and orthopaedic performed, at least in the form of a photodiode and is designed for all control units state power switches high-voltage valve. Device control and protection of the Converter contains an additional input for synchronization with the frequency of the high-voltage valve. The key is performed, at least in the form of a transistor with a resistor in the circuit of the collector.

The essence of the proposed technical solution is that the device condition monitoring of high-voltage valve transformer orthopaedic made in the form of LEDs, and each block status control power switches high-voltage gate entered the Zener diode, the capacitor, the node synchronization and node delay and pulse shaping, key, each node delay and pulse shaping are performed with different time delays of the pulses, orthopaedic performed, for example, in the form of a photodiode. The proposed device in time detects the malfunction of the power switches according to the information which is transmitted on an open optical channel (air) narrow light pulses on orthopaedic and device control and protection of the inverter and time blocks operation of the Converter. In the event of an electric arc between conductors in high voltage valve due to external overvoltage or GNC is Rennie damage the design of the valve device control and protection of the Converter will shut off the inverter from the mains. If all power switches intact, the device control and protection of the Converter reports this to the control system of the Converter, and the Converter is allowed.

The presence of these essential features and the original scheme of connections allowed simple means to monitor the state of the power switches high-voltage gate Converter and arcing in the design of high-voltage valve, to simplify the design of the device, to reduce power consumption, reduce the cost and extend the functionality of the device.

The claimed technical solution is illustrated by drawings, where figure 2 presents a schematic diagram of a device for monitoring high-voltage gate Converter, POS.1 - power switches high-voltage valve, figure 3-5 shows examples of diagrams of the voltages at the outputs of the row of blocks, explaining the operation of the claimed device.

Device for monitoring high-voltage valve of the Converter contains the control units state power switches high-voltage valve 2 according to the number of power switches in high voltage valve, optiprint 3, is connected to the input of the control and protection of the inverter 4. Each unit status control power switches high-voltage gate 2 contains premicell 5, connected input via the resistor 6 in parallel to the power key high-voltage gate 1, and orthopaedic 7 made in the form of LEDs, connected to the first output with the first output of the rectifier 5. In parallel to the outputs of the rectifier 5 includes a Zener diode 8 and the capacitor 9 and to the second output of the rectifier 5 and the first input that is connected to the resistor 6 connected to the inputs of the synchronization host 10. The output of the synchronization host 10 is connected via the node delay and pulse shaping 11 with a control input key 12. The key 12 is enabled between the second output of the rectifier 5 and the second output orthopaedica 7. The nodes of the delay and pulse shaping 11 different control units state power switches high-voltage gate are different from each time delay of the pulses.

The device control and protection of the Converter 4 can operate in asynchronous mode, or can be synchronized with the frequency of the high-voltage valve. Due to the additional input device control and protection of the inverter device is synchronized. Orthopaedic 3 may be performed, for example, in the form of a photodiode. The key 12 can be made in the form of a transistor with a resistor in the circuit of the collector.

Device for monitoring high-voltage valve of the Converter can operate in the following is azimah:

Power switches high-voltage gate 1 are closed and there is an alternating voltage which is supplied to the inputs of the rectifier 5 through the resistor 6. The rectified voltage is then fed to orthopaedic 7, the Zener diode 8 and the capacitor 9. The capacitor 9 is charged to a voltage level which organic Zener diode 8. The synchronization host 10 converts AC voltage into a rectangular pulse, the beginning and the end of which coincide with the moment of transition of the sine wave crosses zero. These pulses arrive at the input node of the delay and pulse shaping 11, performing the necessary time delay of the control pulses. In this case, all the nodes of the delay and pulse shaping device 11 are different from each time delay of the control pulses, to avoid the simultaneous operation of two or more optoporation 7. Then in the node 11 is formed of pulses received on the control input key 12. The key 12 is opened and the capacitor 9 starts to be discharged through orthopaedic 7. Orthopaedic 7 emits a narrow light pulse with a duration of about 0.5 to 0.8 milliseconds)taken by optipranolol 3. As the narrow pulse, and the energy is taken from the condenser 9, it becomes possible to significantly reduce the loss in the resistor 6, making it a high resistance, thereby testing the sustained fashion to reduce power consumption. Orthopaedic 3 converts the received light signal into electric power which is supplied to the device control and protection of the inverter 4. In the presence of pulses from all optoporation 7 device control and protection of the Converter 4 according to the control system of the Converter, that all power switches high-voltage gate 1 intact, and permits the operation of the transducer. If one of the power switches high-voltage gate 1 is damaged, and it formed a short circuit, the voltage at the inputs of control unit status key 2, which is connected in parallel to the damaged power key high-voltage valve will be missing. This unit will not emit pulses of light, and their absence will detect the device control and protection of the Converter 4, which disables the Converter. In the event of an electric arc between conductors a and B (see figure 2 and figure 5) in high voltage valve due to external overvoltage or internal damage to the design of the valve on orthopaedic 3 receives a light pulse high duration. Device control and protection of the inverter 4 in this case will issue a command to disconnect the Converter from the mains supply.

The power control and protection 4 can be synchronized with the frequency of the high-voltage valve that is not synchronized. If the unit is synchronized with the frequency of the high-voltage valve (block filed with the synchronization signal, for example, with a system of regulation of the Converter), has the ability to accurately determine the beginning and end of the pulse control units state power switches high-voltage gate 2 and the number of invalid security key high-voltage valve, if any.

If the power control and protection 4 is not synchronized with the frequency of the high-voltage valve has the ability to accurately determine only the number of corrupted power switches high-voltage gate 1. Accurate identification of damaged power key high-voltage valve is possible in this case only in serviceable condition at the power switches high-voltage gate.

Monitoring the status of the power switches high-voltage valve of the Converter is performed under certain conditions: before and after inverter operation or during no-current intervals. During operation of the inverter power switches are in the open state, therefore, the mode of control of their health the claimed device in this case is blocked, but there is control over the occurrence of the arc.

As the power key can be used with the following devices: thyristors, triacs, IGBTs, IGCTs, ATT, etc. the instruments. This does not apply to the proposed device. As the synchronization host can use any threshold element is a transistor, a logic element, etc. as a unit delay and pulse shaping can be used, for example, a transistor or a logic element with delaying RC-chain on their input (recharge time of the capacitor determines the duration of the delay) and differentiating RC-circuits on their outputs (the recharge time of the capacitor of this chain determines the pulse duration). As the key can be used: logic element chip, a transistor with a resistor in a series circuit with led (valid no resistor in one of the following conditions: the speed limit turn-key, small-capacity capacitor, the large value of the pulse current at the key and LEDs).

In comparison with the prototype of the present invention by introducing into the device capacitor of the node synchronization, node delay and pulse shaping and key allows you to transfer information narrow pulses, which reduces power consumption and greatly increases the life of the LEDs. This fact provides the possibility of using resistors with higher resistance, lower power and cost. The transmission of information by public Opti is a mini-channel (by air) can reduce the number of optipranolol, replace expensive fiber, ortopedici and orthopaedic for cheap LEDs and photodiode. Extending the functionality of the device, namely, the opportunity to supervise not only the power switches high-voltage motor, but if damage is discovered in the design of high-voltage valve or the occurrence of an electric arc in a timely manner to disconnect the device of smooth start.

Using a device for monitoring high-voltage gate Converter provides reduced power consumption and cost of the device, simplifying the design, functionality enhancements. These advantages allow a significant economic effect from implementation of this invention.

The proposed device can be implemented on the industrial electrical and find wide application in the power industry.

1. Device for monitoring high-voltage valve of the Converter containing the control units state power switches high-voltage valve according to the number of series-connected power switches, each control unit state power switches high-voltage valve contains a rectifier connected to the input through a resistor in parallel to the outputs, p is designated for high-voltage power key valve and orthopaedic, one output connected to the first output of the rectifier, orthopaedic, the output connected to the input of the control and protection of the Converter is characterized in that each control unit state power switches includes a Zener diode and a capacitor connected in parallel to the outputs of the rectifier, the node synchronization, the node delay and pulse shaping with appropriate time delays and the key entered between the second rectifier output and the second output orthopaedica made in the form of LEDs, and the control input of the key is connected via the node delay and pulse shaping to the output of the synchronization host connected to one input rectifier input and a second input from a second output of the rectifier, and orthopaedic performed, at least in the form of a photodiode and is designed for all control units state power switches high-voltage gate.

2. Device for monitoring high-voltage valve of the Converter according to claim 1, characterized in that the device control and protection of the Converter contains an additional input for synchronization with the frequency of the high-voltage gate.

3. Device for monitoring high-voltage valve of the Converter according to claim 1, characterized in that the key is performed, at least in the form of TRANS the Stora with a resistor in the circuit of the collector.



 

Same patents:

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: 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: 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: 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: 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: 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: 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: 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: 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

The invention relates to a Converter equipment and can find application, for example, in a regulated AC motors

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!