36 results about "Transient recovery voltage" patented technology

The invention discloses to a series connection type voltage transient variation compensation control circuit, comprising a rectification link, an inverting link and a filtration link which are sequentially connected; the circuit further comprises a by-pass switch; the control circuit adopts carrier wave inverse cascading control method; the series connection type voltage transient variation compensation control circuit and the control method in the invention have small volume and low manufacturing cost without a power frequency injection transformer and an energy storage component; the circuit can compensate transient low voltage of symmetrical three-phase power system voltage, which is only 37 percent of rated value, or can compensate transient zero voltage of one-phase to two-phase voltage, only at least one-phase voltage is rated; when the voltage is high transiently, no matter the three-phase voltage is in any case, the compensation control circuit can compensate the three-phase load voltage to be rated; in addition, the inverting link adopts a tri-level half-bridge inverting circuit to reduce voltage stress of a switch pipe when the bus bar voltage is high, and the output voltage harmonic content is reduced, so as to bring convenience to the design of a filter.

The invention relates to a high-pressure gas breaker breaking performance assessment method and system. The method comprises the following steps of: carrying out magnet dynamic simulation on an arcing process of a high-pressure gas breaker to obtain total arc voltage and arc current before the arc current crosses zero; extracting model parameters of a preset zero area arc model; taking the total arc voltage and the arc current as initial conditions to solve past-arc current under the action of transient recovery voltage on the basis of the zero area arc model; judging whether the high-pressure gas breaker causes thermal breakdown or not in the breaking process according to change trend of the past-arc current; obtaining pressure intensity distribution and temperature distribution in an arc extinction chamber under the action of the past-arc current through magnet dynamic simulation, comparing field intensity, caused by the action of the transient recovery voltage, at each point of the arc extinction chamber, corresponding temperature and critical breakdown field intensity, and assessing the probability of electric breakdown in the arc extinction chamber. By adoption of the method and system provided by the invention, the comprehensive assessment for the past-arc thermal breakdown and electric breakdown characteristics of the high-pressure gas breaker is realized.

The invention discloses a device for limiting a peak value and the rate of rise of transient recovery voltage of a circuit breaker, which not only can limit the rate of rise of the transient recovery voltage of the circuit breaker, but also can limit the peak value of the transient recovery voltage of the circuit breaker. In the device of the invention, the two ends of the circuit breaker are connected in parallel with a capacitor and a lightning protector so as to limit the transient recovery voltage of the circuit breaker; the capacitor is connected in parallel so as to limit the rate of rise of the transient recovery voltage of the circuit breaker; and the lightning protector is connected in parallel to the two ends of the circuit breaker can limit the peak value of the transient recovery voltage of the circuit breaker.

The invention relates to a method for calculating a transient recovery voltage (TRV) waveform parameter. A plurality of tangent lines required in a standard are calculated through TRV waveform rotation, so that the parameter of a TRV waveform is obtained, human errors are reduced, the primitiveness of data is ensured, and the accuracy of test data analysis is increased. The method has the advantages of intuition and visualization of a graphic-art technique, and has the advantages of convenience and high efficiency simultaneously; the test efficiency is increased. The accurate TRV parameter obtained through the method can be taken as a reference for test personal to adjust a test loop parameter, so that the breaking property of a tested circuit breaker can be checked more accurately, and technical support is provided for the safe running of an electric power system.

The invention discloses an insulating property optimization method of a 500kV porcelain pole breaker used for an alternating current filter. The insulating property optimization method comprises the following steps: 1) judging the fault type of the 500kV porcelain pole breaker, wherein the fault type comprises an external insulating fault and an internal insulating fault; and 2) when the fault type is an external insulating fault, optimizing a dry arcing distance, improving the air pressure of an arc extinguish chamber or investing a breaking phase selected function when the fault type is a restrike fault, improving contact materials when the fault type is the electric field distortion of the arc extinguish chamber since the contact splashes metal foreign matters, and optimizing a voltage sharing capacitor and an arc extinguish chamber arrangement structure when the fault type is that the contact of the arc extinguish chamber radially breaks down the inner wall of a porcelain cover. According to different fault types, different optimization methods used for improving the insulating property of the breaker are put forward to guarantee that insulating faults including the internal restrike, the external insulating flashover and the like of the arc extinguish chamber can be avoided under the situation that the breaker frequently switches the alternating current filter and is subjected to high transient recovery voltage.

The invention discloses a self-voltage-sharing control method for dynamic charge compensation of a multi-fracture vacuum circuit breaker. According to the method, a sealing ring in a main shielding case of a vacuum arc-extinguishing chamber is vertically connected with a voltage-sharing capacitor, the adsorption of charges by the main shielding case of the vacuum arc-extinguishing chamber is achieved to participate in the counteracting of post-arc unbalanced charges of a contact gap, and then uneven dynamic voltage distribution caused by the post-arc unbalanced charges of the contact gap is compensated, and dynamic self-voltage-sharing of a transient recovery voltage (TRV) in a stable stage is achieved. Control switches S1 and S2 are introduced, and the control switches S1 and S2 are controlled to be discontinuously conducted through real-time detection and judgment to achieve the dynamic self-voltage-sharing control of real-time dynamic charge compensation in different stages of the TRV, so that a real-time dynamic self-voltage-sharing effect is obtained, the dynamic voltage distribution uniformity of the multi-fracture vacuum circuit breaker can be greatly improved, the breakingcapacity of each fracture is exerted to the greatest extent, and the overall breaking capacity of the multi-fracture vacuum circuit breaker is improved.

The invention relates to a electric distribution apparatus comprising a circuit breaker device or interrupting device which is named as a first device, and an electric isolation device named as a second device. The first device and the second device are connected in parallel and occupying open and closed positions of a switching device. The two electric devices may use a first position and a second position. The opening and closing of the first and the second electric devices are controlled by the first electric device. When the switching device is moved from the closing position to the opening position, the contact of the isolation device is firstly opened. Arc and arc voltage generate between contacts so that current is switched to the breaker device or interrupting device. before the contact of the breaker device or interrupting device is opened, the contacts are open till the ample gap generates between contacts of the isolation device. Therefore, after contacts of two devices are closed, when transient recovery voltage is established, any subsequent dielectric breakdown at the position of the isolation device is prevented.

The invention, which relates to the technical field of high-voltage alternating-current circuit breaker, discloses a method for determining a non-uniform coefficient of a circuit breaker and correcting a measurement result of a voltage divider. The method comprises: a parameter of a circuit component in a circuit breaker circuit is determined; an alternating-current equivalent circuit and a direct-current equivalent circuit after capacitive load breaking of the circuit breaker are established; a transient recovery voltage after superimposition of the alternating current and direct current is obtained; according to the superimposed transient recovery voltage, a voltage peak value of a breaking fracture of the circuit breaker and a compensation voltage of a voltage divider are obtained; and a non-uniform coefficient of the breaking fracture of the circuit breaker is determined according to the voltage peak value o and a measurement result of the voltage divider is corrected based on the compensation voltage. With the method disclosed by the invention, under the influence of the parameter of the circuit component in the circuit breaker circuit, the dynamic change of the non-uniform coefficient of the circuit breaker is determined accurately and effectively; and the measurement result of the voltage divider is corrected, so that a transient voltage distribution situation meeting the actual working condition better in engineering is obtained.

The invention provides a multi-functional integrated circuit protection device applied to a 6-66kv power grid system. The multi-functional integrated circuit protection device comprises a composite circuit formed by nonlinear damping devices Rk1 and Rk2 and a nonlinear damping resistor RG3 having the characteristic of ultra-low impedance and an oversized energy capacity. According to the invention, the multi-functional integrated circuit protection device can effective damp and suppress the rising rate and amplitude of transient recovery voltage of a vacuum circuit breaker, and prevent the generation of over voltage. In the on-off of the circuit breaker, operating over voltage of oscillation generation due to mutual conversion of electric energy and magnetic energy is damped and suppressed to switch on-off of high short circuit capacity of the vacuum circuit breaker. Through the combined application of the nonlinear damping resistors and the circuit design of an artificial neutral point O, the multi-functional integrated circuit protection device has the functions of excellent lightning protection, damping and suppression of phase-phase and phase-ground resonance and operating over voltage, and especially excellent suppression of single-phase intermittent arc grounding over voltage, and serves to eliminate electric arc over voltage.

The invention discloses a four-parameter transient recovery voltage (TRV) regulating circuit for an on-off test of a high-voltage alternating-current circuit breaker. The TRV regulating circuit comprises a first RC frequency modulation circuit, a second RC frequency modulation circuit and a time delay capacitor which are connected in parallel. The second RC frequency modulation circuit is used foradjusting the oscillation frequency and amplitude of a TRV waveform after an inflection point of a TRV waveform at the rising stage and is connected in series with a nonlinear resistor; and when theexperimental voltage reaches the voltage corresponding to the inflection point of the TRV waveform, the nonlinear resistor is activated, so that the second RC frequency modulation circuit is in conduction. According to the four-parameter transient recovery voltage (TRV) regulating circuit disclosed by the invention, the non-linear resistor is used in the second RC frequency modulation circuit to replace a traditional electric reactor and the requirements for parameters such as the nominal discharge current and the square wave through-flow capacity of the non-linear resistor are low, so that the size, the weight and the cost of the used non-linear resistor are only about 1% of the existing reactor.

The invention provides a low-cost high-voltage input step-down power supply, which arranges a primary series voltage-limiting circuit in front of a step-down power circuit for suppressing transient surge voltage existed in voltage of an input power supply, attenuating high voltage input from outside into an acceptable range for providing power supply input for the step-down power circuit. The invention can improve the maximum input voltage of common MOSFET built-in step-down power supply, and can be used for field of vehicular power supply.

The invention discloses an HVF vacuum circuit breaker which comprises a base. Walking wheels are fixedly installed at the two ends of the lower surface of the base respectively. A conductive part machine shell is fixedly installed at one end of the upper surface of the base. A power part machine shell is fixedly installed at the portion, on one side of the conductive part machine shell, of the base. A conductive mechanism with both the two ends penetrating through and extending to the side wall of the conductive part machine shell is fixedly installed in the conductive part machine shell. A breaking spring is fixedly connected with the bottom end of the conductive mechanism. The HVF vacuum circuit breaker almost does not need to be maintained, only parts normally abraded and aged need to be maintained, a vacuum arc extinguish chamber and a support of the vacuum arc extinguish chamber do not need to be maintained, the full-load short-circuit current probably caused by failures directly happening behind a transformer, a power generator or a current-limiting choking coil is avoided, the boosting rate of transient recovery voltages can reach up to 10 kilovolts per microsecond when failures happen behind the choking coil, and the dangerous state can be quite conveniently eliminated by means of the vacuum circuit breaker.

The invention discloses a disconnecting switch and vacuum circuit breaker composite system. A disconnecting switch and a vacuum circuit breaker are connected in series to constitute a composite switch system in which a disconnecting break is associated with a vacuum interrupter break, wherein the disconnecting beak is a spacing zone between a disconnecting link of the disconnecting switch and the tail end of a moving contact of the vacuum circuit breaker, and the vacuum interrupter break is the other break between the moving contact and a static contact of the vacuum circuit breaker. The disconnecting break provides a visible electric spacing section for the vacuum interrupter break. By implementation of the composite system scheme disclosed by the invention, the disconnecting switch and the vacuum circuit breaker are associated mutually so that the composite system is free from electric-mechanical interlocking and is compact in volume, simple and reliable in structure and increased in safety; and particularly, a vacuum interrupter of the vacuum circuit breaker only needs to bear lower power frequency recovery voltage and transient recovery voltage, so that the insulation requirement for the vacuum interrupter is reduced and the cost is reduced.

The invention provides a method for extracting transient recovery voltage (TRV) waveform envelope characteristic parameters. According to the test voltage and a test mode, TRV waveform characteristicsare determined, and the envelope characteristic parameters are automatically extracted. The method is advantaged in that computational complexity is low, calculation accuracy is relatively high, dataoriginality is guaranteed, and a local Longge phenomenon due to use of polynomial fitting is avoided.

The invention belongs to the field of current limiters and circuit breakers, relating to a parameter optimization method for a fast switch type current limiter and a circuit breaker. A circuit breakeron-off characteristic analysis model based on a fast switch type current limiter is used so as to acquire a mathematical model comprising multiple paramaters among a plurality of standard requirements such as the current-limiting inductor, cut voltage-sharing capacitor, current limiter ground capacitor and circuit breaker ground capacitor, transient recovery voltage first reference voltage, firsttransient recovery voltage peak value time, the number of limiter switches and depth of current limiting. A parameter optimization model of the fast switch type current limiter and the circuit breaker is established and parameters of the model by adopting a genetic algorithm are optimized. The parameter optimization method provided by the invention not only can solve the overvoltage problem of the fracture of the current limiter, but also can ensure the reliable disconnection of the circuit breaker, and effectively solves the matching problem of the current limiter and the circuit breaker.

The invention discloses a TRV (transient recovery voltage) waveform enveloping line and standard value parameter calculation method based on coordinate system transfer. By converting TRV waveform data which is obtained through simulation software calculation or high-capacity tests station short-circuit breaking tests to a polar coordinate system from a Descartes coordinate system, in this way, an enveloping line which is constituted by three straight lines (two parameter TRV) tangent to TRV waveforms or four enveloping straight lines (four parameter TRV) tangent to TRV waveforms, and standard value parameters of the TRV are calculated. The obtained TRV standard value parameters provide theoretical basis for adjusting test loops R, L C element parameters during expected TRV debugging and reading and assessing TRV parameters after tests when a high-capacity test station conducts short circuit cut-off tests.

The invention relates to an instantaneous-fault identification method for beat frequency detection adopting recovery-voltage delay one-half cycle superposition and belongs to the field of power system relay protection. The method includes that for an electric transmission line with two ends provided with paralleling reactors, calculating the free oscillation component frequency omega and the oscillating period tau according to line parameters and compensation degree of the paralleling reactors; when line failure occurs and at the moment starting from 200ms after a breaker is disconnected, superposing disconnected-phase voltage values acquired by a measuring end and voltage values of current values 10ms ago, and extracting frequency omega j (j=1,2,3) of superposed waveforms within three sliding time windows by the aid of discrete Fourier transformation, wherein each of the sliding time window is 2 tau in length; respectively comparing and extracting size relation of the omega j and the omega, and if the extracted frequency is equal to the calculated free oscillation frequency, judging to be instantaneous fault, or otherwise, judging to be permanent fault. As is show in a great deal of simulation tests and verification, the instantaneous-fault identification method is reliable and efficient.

The invention discloses an airflow control element with a shielding function, one structure of the airflow control element is composed of a base body fired by a polytetrafluoroethylene material and ashielding element embedded in the base body, the base body is of an annular structure and is provided with a streamline outer surface, and the top of the base body is a throat area; and the other structure is formed by superposing a shielding substrate made of an aluminum material or a copper material or a steel material with an arc-combustion-resistant coating sprayed on the outer surface, and the top of the shielding substrate is a throat area. A shielding function is achieved while airflow is controlled, SF6 high-pressure airflow is guided and controlled in the large-current breaking process of a circuit breaker, the maximum field intensity under transient recovery voltage is controlled, and the control requirement of the high-voltage circuit breaker for the large-current breaking performance and the electric field intensity under the transient recovery voltage is met; the electric field distribution of the moving and static contacts under the transient recovery voltage is effectively improved, and the difficulty of the circuit breaker in breaking large current is reduced.

The invention discloses a transient recovery voltage suppression device of an alternating current circuit breaker and a high-voltage direct current system. An interlocking control logic link formed by an interlocking control logic module and a signal selection module is added on a circuit for controlling an alternating current circuit breaker, and an on-off strategy of the alternating current circuit breaker is optimized only through interlocking control logic, so the purpose of suppressing the transient recovery voltage of the alternating-current circuit breaker can be achieved without additionally arranging primary equipment such as an additional lightning arrester or adopting a circuit breaker with a higher voltage level, and the purpose of reducing the transient recovery voltage of the alternating-current circuit breaker can be achieved efficiently and economically. In addition, the delay time of the interlocking control logic can be adjusted according to the actual condition of the AC-DC system to adapt to different system working conditions, so that the economical efficiency and the reliability of the high-voltage DC system are improved, and the technical problems that the economic applicability is poor and the reliability is low due to the fact that the reverse recovery voltage of the alternating-current circuit breaker is adjusted by adopting a method of additionally installing a lightning arrester or adopting a circuit breaker with a higher voltage class in the prior art are solved.

The invention relates to a high-pressure gas breaker breaking performance assessment method and system. The method comprises the following steps of: carrying out magnet dynamic simulation on an arcing process of a high-pressure gas breaker to obtain total arc voltage and arc current before the arc current crosses zero; extracting model parameters of a preset zero area arc model; taking the total arc voltage and the arc current as initial conditions to solve past-arc current under the action of transient recovery voltage on the basis of the zero area arc model; judging whether the high-pressure gas breaker causes thermal breakdown or not in the breaking process according to change trend of the past-arc current; obtaining pressure intensity distribution and temperature distribution in an arc extinction chamber under the action of the past-arc current through magnet dynamic simulation, comparing field intensity, caused by the action of the transient recovery voltage, at each point of the arc extinction chamber, corresponding temperature and critical breakdown field intensity, and assessing the probability of electric breakdown in the arc extinction chamber. By adoption of the method and system provided by the invention, the comprehensive assessment for the past-arc thermal breakdown and electric breakdown characteristics of the high-pressure gas breaker is realized.

A circuit breaker having at least one capacitor assembly connected in parallel across a contact of the circuit breaker. The capacitor assembly can be housed with the contact within a sealed enclosure of the circuit breaker. The enclosure can be configured to house an insulating medium that is configured to reduce or quench an arc(s) that may form at least when the contact of the circuit breaker is displaced from a closed position to an open position. The capacitor assembly, which includes a transient recovery voltage (TRV) capacitor, can be configured to delay terminal fault and short line fault TRV and the rate of rise of the initial TRV (ITRV) that can appear across the open contact of the circuit breaker. By being connected in parallel across the contact, the capacitor assembly can be connected to either side of the contact, regardless of whether the contact is in an open position or closed position.

The invention relates to a method for calculating a transient recovery voltage (TRV) waveform parameter. A plurality of tangent lines required in a standard are calculated through TRV waveform rotation, so that the parameter of a TRV waveform is obtained, human errors are reduced, the primitiveness of data is ensured, and the accuracy of test data analysis is increased. The method has the advantages of intuition and visualization of a graphic-art technique, and has the advantages of convenience and high efficiency simultaneously; the test efficiency is increased. The accurate TRV parameter obtained through the method can be taken as a reference for test personal to adjust a test loop parameter, so that the breaking property of a tested circuit breaker can be checked more accurately, and technical support is provided for the safe running of an electric power system.

The invention relates to an electrical distribution equipment comprising an electrical disconnecting or interrupting device called a first device and an electrical isolating device called a second device, the first device and the second device being connected in parallel, respectively in the open position of the switchgear and closed position, both electrical devices are capable of assuming a first position and a second position, the opening and closing of the first and second electrical devices are controlled by the first electrical device, and when the switching device moves from the closing device to the opening device, the isolation The contacts of the device open first, creating an arc and an arc voltage between its contacts so that substantially all of the current is diverted to the breaking or interrupting device, the opening of which continues until the contacts of the breaking or interrupting device open, until sufficient clearance is obtained between the contacts of said isolating means to prevent any subsequent dielectric breakdown at the location of the isolating means when the transient recovery voltage is established after the contacts of the two means are closed .

The invention relates to a segmented closed-loop control phase selection breaking control device and control method, the phase selection breaking control device comprises a controller, a data acquisition module, a driving module and an input and output module, the controller processes an input signal, determines a phase selection breaking condition, and performs a phase selection breaking control function; the data acquisition module is used for acquiring and processing three-phase voltage and current signals in a power grid in real time, performing zero point detection and sending a zero point signal to the controller; the driving module is used for driving the switching mechanism to work and completing enabling control on a winding coil in the permanent magnetic mechanism; the transient recovery voltage and the vacuum gap are monitored in real time, whether the breakdown risk exists or not is judged based on the corresponding relation between the breakdown voltage and the vacuum gap, the on-off speed of the circuit breaker is controlled in a closed-loop mode, and the optimal balance of the on-off speed and the cut-off value of the vacuum circuit breaker is achieved.

The invention provides a switching power supply device capable of ensuring the transient recovery of the voltage discharge of an electrolytic capacitor after the rectifying process, without the addition of power consumption. The switching power supply device comprises a rectifying circuit used for rectifying the AC voltage; an electrolytic capacitor used for rectifying and smoothing the AC voltage; a transformer used for applying a smoothed voltage onto the electrolytic capacitor; a switching element connected to the transformer (T); and a control circuit (Z1) used for enabling the switching on / off of the switching element. The control circuit (Z1) is composed of a start-up circuit (Z10) and a discharge circuit (Z14). The start-up circuit (Z10) is used for supplying the voltage of the electrolytic capacitor to the Vcc terminal of the control circuit (Z1). The discharge circuit (Z14) is connected with the Vcc terminal and is used for discharging the transient recovery voltage of the electrolytic capacitor.

A circuit breaker having at least one capacitor assembly connected in parallel across a contact of the circuit breaker. The capacitor assembly can be housed with the contact within a sealed enclosure of the circuit breaker. The enclosure can be configured to house an insulating medium that is configured to reduce or quench an arc(s) that may form at least when the contact of the circuit breaker is displaced from a closed position to an open position. The capacitor assembly, which includes a transient recovery voltage (TRV) capacitor, can be configured to delay terminal fault and short line fault TRV and the rate of rise of the initial TRV (ITRV) that can appear across the open contact of the circuit breaker.

The chamber (1) has a tubular shaped arc blast isolating nozzle (5) extending along a longitudinal axis (XX'). A movable contact (3) includes a hollow inner tube (30) whose end is connected to a contact portion (31) of the movable contact, where arc blowing is entirely realized inside of the hollow tube along the longitudinal axis of the chamber. A neck (304) is provided in upstream of the contact portion for passage of gas. A release portion (305) is provided between the neck and the contact portion for passage of gas. An independent claim is also included a high-voltage direct-current conversion substation comprising a thyristor through which opening of a loading valve is realized.

The invention provides a circuit breaker transient recovery voltage inhibition system and a circuit breaker transient recovery voltage inhibition method of a 1000kV alternative-current filter group. The circuit breaker transient recovery voltage inhibition system comprises an alternative-current filter group, a circuit breaker CB, an auxiliary switch CBR, a damping resistor R and an alternative-current bus, wherein one end of the alternative-current filter group is connected with the alternative-current bus through the circuit breaker CB; the other end of the alternative-current filter group is grounded; the auxiliary switch CBR and the damping resistor R are connected in parallel with two ends of the circuit breaker CB after being connected in series. By adopting the circuit breaker transient recovery voltage inhibition system and the circuit breaker transient recovery voltage inhibition method of the1000kV alternative-current filter group, the probability that the gate of the circuit breaker is successfully dissociated is increased, the requirements on the manufacturing parameters of the circuit breaker are rlowered, the capability of the circuit breaker in breaking capacity current is effectively improved, and the transient recovery voltage is reduced.