Method of protection of thyristor converter in emergency operation

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

 

The invention relates to a Converter equipment, in particular to the protection of high current thyristor converters in emergency mode. The emergency mode is a mode in which during operation of the Converter is not functioning basic protection.

Thyristor converters are widely used for electric drive, powerful heating and lighting installations for various purposes, be sure to incorporate various devices to prevent overload, internal and external short circuits. The last back-stage powerful protection thyristor Converter are high-speed switches that provide disable overcurrent when failure of the main protection systems. However, by itself, giving a high-speed switch (BV) functions of backup protection assumes that the set values of the currents off BV for all modes unacceptable overloads should exceed the level of basic protection. To ensure proper shutdown sequence primary and backup protection in case of dynamic overloads and, in particular, when overload occurs when you turn on the boost Converter under full load or with a sharp increase of the output current as a result of its regulation on the requirements to operate is the current shutdown BV significantly (sometimes repeatedly) overstate. This overestimation leads to unnecessary thermal and electrodynamic effects in the internal and external circuits of the Converter during emergency switching BV.

There is a method of protection thyristor Converter [RF Patent №2197051, bull. Fig. No. 2, str, 2003], which control the magnitude of the input current of the Converter, and when the limit values form the signal blocking control pulses (basic protection) and the signal to bypass the Converter output.

The drawback of this method is that in the implementation of the protection of thyristor Converter is carried out only by blocking the control pulses when the limit values of the input current of the Converter (i.e. valid only basic protection). In emergency mode when failure of the main protection, back off the output current of the Converter is missing. In this case, there is no possibility to protect from the harmful effects of overcurrent internal and external circuit elements of the Converter.

The closest way to the same destination to the claimed invention on the totality of symptoms is the method described in [Emoh, Weselne. Protection of semiconductor converters, M., Energoizdat, 1982, p.90-92], selected the us as a prototype. In the specified way to carry out the following set of actions to ensure the protection of thyristor Converter in emergency mode. Set the maximum value of a given magnitude of input current* (*the present value of the input current, we understand the value of I1=kII=Iowhere II, Iothe magnitude of the input and respectively output currents of the Converter; k - coefficient of reduction; I1- the value of the input current of the Converter corresponding to the maximum allowable input current of the Converter. Control the magnitude of the output current of the Converter and the derivative of this quantity with time (hereinafter for brevity derivative of the magnitude of the output current of the Converter in time we will call simply the derivative of the output current of the inverter), specify the range of values of a residual current off BV the range of values of the derivative of the output current of the Converter, while the lowest specified value residual current off BV corresponds to the maximum value of the derivative of the output current of the Converter, and the maximum set value of residual current off BV corresponds to zero value of the derivative of the output current of the Converter. The range of what he values power off BV set so what is the minimum value of the residual current off BV lies above the maximum present value of the input current of the Converter. When reaching the output current of the Converter values current shutdown BV, lying in a given range, disable BV.

For reasons that impede the achievement of specified following technical result, when using the known method adopted for the prototype include the following. Although the method-prototype and is backing off the output current of the inverter in emergency mode when failure of the main protection, but the backup protection system, made on the basis of BV, triggered by very high values of currents static overload, which leads to high thermal and electrodynamic stresses in the inner and outer circuits of the Converter during emergency switching BV.

The invention consists in the following.

Object of the invention is protection from the harmful effects of overcurrent internal and external elements of the circuits of the thyristor Converter in case of blackouts * (* Under emergency shutdown BV will understand such a shutdown, which occurs under conditions of defective primary protection) high speed circuit breaker.

The technical result of the invention is the tsya supporting the operation of the thyristor Converter in emergency mode reduction of harmful thermal and electrodynamic effects overcurrent protection on internal and external elements of the circuits of the thyristor Converter in case of emergency shutdown of a high-speed switch.

Our proposed method of protection thyristor Converter in case of emergency mode significantly reduces the harmful effects of overcurrent protection on internal and external circuit elements of the Converter. This results in higher resource power components of the Converter, the resource pools in the system backup protection.

This technical result is achieved by the well known method of protecting a thyristor Converter, comprising setting the maximum permissible values given value of the input current of the Converter at the maximum allowable magnitude of the input current of the inverter, setting a range of values of a residual current off BV the range of values of the derivative of the output current of the Converter, while the maximum value of the residual current off BV in this range corresponds to zero value of the derivative of the output current of the Converter, the control value of the output current of the Converter and the derivative of the output current of the inverter, disconnect BV when reaching the output current of the Converter value is of the current value of disable BV, lying in a given range, in accordance with the proposed technical solution the range of values of a residual current off BV set so that the minimum value of the shut-off current base rates in this range coincides with the maximum value present value of the input current of the Converter, while the minimum value of the residual current off BV in this range corresponds to the maximum value of the derivative of the output current of the Converter.

The basis of the proposed technical solution is setting a different range of values of a residual current off BV associated in some way with the maximum valid value for the given value of the input current of the Converter (and, respectively, with the maximum value of the input current of the Converter), which creates conditions for reducing current overload inverter backup mode emergency shutdown BV.

Figure 1 shows a diagram illustrating the operation of the Converter protection in emergency mode in the proposed method. Vertical arrows indicate the axis currents I. Horizontal straight lines a, b, C, d, e shown, respectively, in the levels of the currents I1, I2, I3, I4, I5where I1- set the maximum allowable value is shown the input current of the Converter, in accordance with the inventive method the same as the minimum value of the residual current off BV; I2- the maximum value of the residual current off BV, which corresponds to zero value of the derivative of the output current of the Converter according to the present method; I3- the minimal value of the current off BV corresponding to the maximum value of the derivative of the output current of the Converter, according to the method prototype; I4- the value of the residual current off BV the method prototype, which corresponds asked us in the present method the maximum value of the derivative of the output current of the Converter; I5- the maximum value of the residual current off BV, which corresponds to zero value of the derivative of the output current of the Converter, according to the method prototype. The minimum value of the residual current off BV according to the claimed method, set so that it coincides with the set maximum value shows the input current of the Converter, while it corresponds to the maximum value of the derivative of the output current of the Converter. Thus, according to the present method, the range of values of a residual current off BV for the indicate so, it is located between lines a and b in figure 1 and correspond to the values of the derivative of the output current of the Converter, extending from zero (which corresponds to the maximum current shutdown BV I2) to the maximum (which corresponds to the minimum current shutdown BV equivalent of I1). This range is indicated in figure 1 by hatching. If we refer to the range of values of a residual current off BV the method prototype, the value of the residual current off BV, which corresponds asked us in the present method the maximum value of the derivative of the output current of the Converter will be located at the level of I4.

The work of the proposed method of protection thyristor Converter in emergency mode as follows. Set the maximum value of a given magnitude of input current blocking control pulses at the maximum allowable input current of the Converter. Figure 1 direct α at the level of I1this corresponds to the value below which implements the operating mode of thyristor Converter. To control the output current of the Converter and its derivative can be used relays differential shunt (RDS)that is included with the becoming BV. As is known, the feature works RDS is that the value of current at which it is triggered (the output current of the inverter), is not constant, but varies with the speed of change depends on the product of the current), and the higher the derivative of the current, the smaller the amount of current, which is triggered RDS. Specify the range of values of a residual current off BV the range of values of the derivative of the output current of the Converter. Ask this range so that the minimum value of the residual current off BV in this range corresponds to the maximum value of the derivative of the output current of the Converter. This is the minimum value of the residual current off BV set equal to the maximum allowable value given the magnitude of the input current of the Converter. The maximum value of the shut-off current base rates in this range are set to a zero value of the derivative of the output current of the Converter. The meaning of such a set range of values of a residual current off BV is the following. When emergency mode, i.e. in those cases where the defective basic protection of the Converter, the inclusion of the inverter under load and the regulation of the output current during inverter operation can be implemented is better at low (small) values of the derivative of the output current of the Converter and thus to ensure the operating mode of the Converter. This range of low values of the derivative of the output current of the Converter extends from the zero value of the derivative to the maximum allowable values derived above which violated the terms of the soft-start under load and smooth regulation of the load current. In the present method are asking this range of values of currents off BV, which will correspond to the range of low (small) values of the derivative of the output current of the Converter. Carrying out the soft start under load and smooth regulation of the load current and thus supporting the transducer in operation mode even in conditions of emergency state of the underlying security, control the magnitude of the output current of the Converter. When reaching the output current of the Converter value corresponding to a given value current shutdown BV (the range between the straight lines a and b in figure 1), cutoff BV. Thus, when the emergency is invalid values of the output current of the inverter disabling it is high speed circuit breaker, but at much smaller values of currents failure than in the method prototype.

When implementing the method of the prototype signal disable BV form with invalid exceeding the minimum testing the possible values of the output current disable high speed circuit breaker I 3(live with). As can be seen from Figure 1, the minimal value of the shut-off current BV is above the specified maximum permissible values given the input of the inverter current I3>I1. The range of low values of the derivative of the output current in the method prototype will correspond to the range (I4-I5). At the Converter at low (small) values of the derivative of the output current in the method prototype in case of emergency invalid values of the output current of the inverter disabling BV will be carried out at much higher values of shut-off current (I4-I5)than in the present method (I1-I2). Because of this and the negative consequences arising in emergency operation of the overcurrent in the method prototype will be significantly higher than in the claimed method.

The company FSUE NIIKI OEP proposed method of protection thyristor Converter was implemented on the basis of serial thyristor unit CTEU-4000, equipped with a high speed circuit breaker BAT-42 sensor output current RDS. Specifying a range of values of a residual current off BV carried out by adjusting the spring tension RDS towards easing the tension of this spring so that the minimum h is Uchenie residual current off high speed circuit breaker in this range coincides with the maximum value present value of the input current of the Converter. Tested derivatives at low power thyristor unit has demonstrated reliable emergency switching power circuits in faulty main protection by turning off the cooling pool at low levels, turning off the current.

The way to protect the thyristor Converter in emergency mode, including setting the maximum permissible values given value of the input current of the Converter at the maximum allowable magnitude of the input current of the inverter, setting range value current shutdown high speed circuit breaker for the range of values of the derivative of the output current of the Converter, while the maximum value of the residual current off high speed circuit breaker in this range corresponds to zero value of the derivative of the output current of the Converter, the control value of the output current of the Converter and the derivative of the output current of the inverter, disconnect the high speed switch when reaching the output current of the Converter values current shutdown high speed circuit breaker, lying in a predetermined range, wherein the range of values the current value of disable high-speed switch is set so that the minimum value of the residual current disconnect b is strdestfolder switch in this range coincides with the maximum value present value of the input current of the Converter, the minimum value of the residual current off high speed circuit breaker in this range corresponds to the maximum value of the derivative of the output current of the Converter.



 

Same patents:

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

The invention relates to power engineering and can be used for signalling the state of the semiconductor valves of the high voltage rectifiers

The invention relates to electrical engineering, namely non-contact protection devices and switching (WEDNESDAY) Autonomous objects, used for protection of electric circuits DC

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!