31results about How to "Reduce power restoration time" patented technology

The invention discloses a fault location method and system suitable for a sectional power supply mode of a high-speed railway. The fault location system comprises sectional protection devices arrangedat the two sides of a sectional protection section with each station being as a boundary, wherein the sectional protection devices are used for judging fault point distance, fault type and fault direction. The fault location method is characterized in that the sectional protection devices at the two side of the corresponding section line judge the fault type and fault direction; and the sectionalprotection devices at the two sides of the corresponding fault section line calculate fault point distance based on a current value obtained at the tripping time. The position of the fault point is calculated by utilizing the current value of each wire at the wire outgoing end in sectional protection tripping data at the two sides of the fault section, and fault type and fault direction can be determined, thereby realizing fault location for the sectional power supply mode.

Disclosed is a coastal area wind prevention security power grid frame construction method based on a graph theory algorithm. The coastal area wind prevention security power grid frame construction method based on the graph theory algorithm includes: using a graph theory path search algorithm to identify power grid frame topology structures of 220KV and above for current and planned power grids, obtaining important degrees of each station and each circuit in topology for normal running and rapid power restoration, and forming a core backbone grid frame of 220V and above in a regional power grid; simultaneously, combing an important user power supply route, selecting a key station and a key circuit which supply power for important users according to a distribution situation and differentiation of the important users, and forming an important user security power supply radiation type fishbone grid frame; then, selecting a contact circuit of a center urban area and an outer area according to grid frame security requirements; finally, organically combining the core backbone grid frame, the radiation type fishbone grid frame and the contact circuit of the center urban area and the outer area so as to construct a coastal area wind prevention security power grid frame. The coastal area wind prevention security power grid frame construction method based on the graph theory algorithm can effectively improve the ability of the regional power grid of withstanding intrusion of natural hazards of typhoons and the like, guaranteeing the important users and supplying power for areas.

The invention provides a functional meter capable of locating a fault point and a locating method of the functional meter. With the functional meter and the locating method thereof adopted, the fault point can be located fast, power supply recovery time can be greatly decreased, economic losses of power supply departments and users can be reduced, and power supply reliability can be improved. The functional meter includes three voltage transformers, three relays I, a switching power source, a voltage detection unit, three current transformers, three relays II, three green lamp indication circuits, a current detection unit, three self-providing power sources, three relays III, a power multiplication unit, a control unit, a self-providing power source discharge monitoring unit, a memory I, a display unit I, a wireless transmission control module, a wireless receiving control module, a processing unit, a memory II and a power grid circuit geographic map electronic simulation board; an overcurrent switch and a zero-current action switch are connected in series so as to form each relay II; the relays II are corresponding to various kinds of line fracture and short-circuiting faults respectively; and the self-providing power sources are connected with red and green light indication units through the relays III, so that a discharge loop can be formed.

The invention discloses a distributed self-healing control method based on feed line topology automation terminals, and the method is characterized in that the method comprises the steps: dividing a power distribution network into a plurality of control regions, wherein the regions have intersections; The interior of each control region is provided with one feed line topology automation terminal.Each feed line topology automation terminal comprises a collection module, a communication module, a control module, a fault analysis calculation module, a storage module and a power module. The feedline topology automation terminal in each control region takes the feed line topology automation terminal as the circle center and a certain distance as the radius to radiate all terminals in the control region outwards through the Ethernet, obtains the line topology information and operation conditions stored in all terminals in the region, thereby achieving the information interaction. The sameregion can be covered by a plurality of terminals. Meanwhile, the feed line topology automation terminals enable the line topology information and on / off conditions of the control regions where the terminals in the regions and the radiated terminals are located to be stored in a storage module. When a line has a fault, there is no need of real-time interaction, and the main and standby managementis achieved through a priority method, and the control can be achieved through the self-stored topology information. The control method employs a point-to-surface mode, and gradually expands to the whole power distribution network. The method improves the power supply safety, reliability, quality and economical performances of the power distribution network, and effectively improves the emergencycapability of the power distribution network. The method greatly improves the power supply speed of a non-fault region through the stored line topology information.

The invention discloses a detecting and positioning method of a bus coupler flashover fault in a subway alternating current power system. The method comprises the following steps: (1) all protection devices configured in a single power supply zone in the subway alternating current power system is connected to a unified GOOSE network, and the protection devices connected with the GOOSE network are provided with a GOOSE network communication capability; and (2) a bus coupler protection device performing fault detection and location inside each transformer substation realizes a decision logic, and when all the decision logics are met, the bus coupler protection device determines that the a bus coupling protected by the bus coupling protection device has a flashover fault and the bus coupler protection device alarms. The method of the invention can rapidly detect and locate the flashover fault point after the bus coupler flashover fault happens, so that the operating maintenance personnel can quickly restore the normal operation of the metro power supply system and the power supply recovery time is shortened.

The invention provides a control method for a sectionalizer. The actuation time of the sectionalizer is flexibly controlled through inverse time limit overcurrent protection characteristics, when overcurrents exist in a transmission line, the actuation time of the sectionalizer is short when the overcurrents are large, the larger delta t is, the quicker a set critical value t is reached through accumulation, the actuation time of the sectionalizer is long when the overcurrents are small, the smaller delta t is, the slower the set critical value t is reached through accumulation, and therefore the power supply restoration time of the transmission line can be well shortened. The actuation time is short when the overcurrents are large, and the probability in which the transmission line and equipment are damaged can be decreased. The invention further discloses a control terminal and system for the sectionalizer.

The invention relates to an automatic grid-connected control system for a power generator set. The power generator set comprises a power generator and an engine which are mutually connected, wherein the power generator is connected to a load through a parallel computer circuit breaker. The control system comprises a microcomputer controller for receiving an external signal; a switch controller, a speed adjustor and a sensor are arranged between the microcomputer controller and the engine; a voltage adjustor is arranged between the microcomputer controller and the power generator; and the microcomputer controller is connected to the parallel computer circuit breaker through a closing and opening relay. The automatic grid-connected control system has the benefits that the control process of a digital parallel computer of the power generator set is realized by utilizing the microcomputer controller, the startup, the parallel computer operation and the power supply process of the power generator set are automatically finished, and all human judgment and all manual operation are realized by the microcomputer controller, so that the parallel computer system is simplified, the power supply recovery time is shortened, and the reliability of equipment operation is improved, and the maintenance cost is reduced.

The invention discloses a rapid monitoring and alarming system of faults of power transmission circuits. The system comprises a monitoring system platform. Bidrectional connection is achieved betweenthe monitoring system platform and a fault acquisition unit. The fault acquisition unit is formed by N sub-acquisition modules. Bidirectional connection is achieved between the monitoring system platform and an external network communication transmission system. The external network communication transmission system comprises a sharing information collection module, a sharing information integration module and a sharing information carrying module. The invention relates to the technical field of electric power monitoring. According to the invention, well fault monitoring of power transmissioncircuits in the region can be achieved; it is achieved that internal and external network communication and data transmission can be performed between towers; through a tower fault monitoring unit which is closest to a main station, information is sent to the main station, so alarming processing is performed; objectives of seizing the first-aid repairing opportunity and shortening power supplyingrecovering time are achieved; repairing efficiency is greatly improved; and reliability of power supply is ensured.

The invention discloses a fault locating method and system for multiple branch lines of an electric railway. Field collection units are installed on all branch lines including phase splitting lines and multiple branch lines of a hub station; startup of the field collection unit is determined according to line current collected in real time of a position where the field collection unit is and a line-to-ground field; a started field collection unit collects fault current of a branch line in which the started field collection unit is, but fault current of a non-started field collection unit is zero; and a position of a branch line with the fault is determined according to a distribution characteristic of fault current of each branch line, and faults of multiple branch lines are located accurately by using a reactance method. The method and system provide reliable basis for fault correction of the electric railway branch lines, and shorten power supply restoration time.

Disclosed is a coastal area wind prevention security power grid frame construction method based on a graph theory algorithm. The coastal area wind prevention security power grid frame construction method based on the graph theory algorithm includes: using a graph theory path search algorithm to identify power grid frame topology structures of 220KV and above for current and planned power grids, obtaining important degrees of each station and each circuit in topology for normal running and rapid power restoration, and forming a core backbone grid frame of 220V and above in a regional power grid; simultaneously, combing an important user power supply route, selecting a key station and a key circuit which supply power for important users according to a distribution situation and differentiation of the important users, and forming an important user security power supply radiation type fishbone grid frame; then, selecting a contact circuit of a center urban area and an outer area according to grid frame security requirements; finally, organically combining the core backbone grid frame, the radiation type fishbone grid frame and the contact circuit of the center urban area and the outer area so as to construct a coastal area wind prevention security power grid frame. The coastal area wind prevention security power grid frame construction method based on the graph theory algorithm can effectively improve the ability of the regional power grid of withstanding intrusion of natural hazards of typhoons and the like, guaranteeing the important users and supplying power for areas.

The invention provides a functional meter capable of locating a fault point and a locating method of the functional meter. With the functional meter and the locating method thereof adopted, the fault point can be located fast, power supply recovery time can be greatly decreased, economic losses of power supply departments and users can be reduced, and power supply reliability can be improved. The functional meter includes three voltage transformers, three relays I, a switching power source, a voltage detection unit, three current transformers, three relays II, three green lamp indication circuits, a current detection unit, three self-providing power sources, three relays III, a power multiplication unit, a control unit, a self-providing power source discharge monitoring unit, a memory I, a display unit I, a wireless transmission control module, a wireless receiving control module, a processing unit, a memory II and a power grid circuit geographic map electronic simulation board; an overcurrent switch and a zero-current action switch are connected in series so as to form each relay II; the relays II are corresponding to various kinds of line fracture and short-circuiting faults respectively; and the self-providing power sources are connected with red and green light indication units through the relays III, so that a discharge loop can be formed.

The invention discloses a voltage amplitude-based fast and accurate fault classification system of a high-voltage transmission line. The system includes a voltage collection module, a voltage processing module and a fault classification module. The voltage collection module is mounted on the high-voltage transmission line, and is connected with the voltage processing module through a noninterference line. The voltage processing module is connected with the fault classification module through a noninterference line. The voltage processing module includes a voltage filtering module and a voltageintercepting module. The voltage amplitude-based fast and accurate fault classification system of the high-voltage transmission line provided by the invention has the advantages that when the high-voltage transmission line fails, fast fault classification can be simply realized through collected three-phase fault voltage signal amplitude and simple filtering and intercepting without the need forfeature extraction of any feature extraction algorithm on fault information, fast elimination of a fault is facilitated, power supply recovery time is saved, and safe, stable and economic running of apower network is technically guaranteed.

The invention relates to a transformer structure capable of rapidly replacing a sleeve and used in high-seismic-intensity areas, and belongs to the manufacturing technical field of a transformer. According to the technical scheme, a high-voltage sleeve (4) is arranged on a high-voltage hoisting seat (6); a high-voltage lead (7) is arranged in the high-voltage hoisting seat (6); a high-voltage hoisting seat heat dissipation apparatus (5) is arranged on the exterior of the high-voltage hoisting seat; and a transformer in a transformer oil tank (10) and a winding (1) connected with an external high-voltage side sleeve are connected with the high-voltage lead (7) and the high-voltage sleeve (4) through a transformer hoisting seat and an oil sleeve (9) for dividing the oil tank. The transformer structure has the beneficial effects as follows: by adoption of the electric power transformer with the structure, when the high-voltage sleeve is damaged, the high-voltage sleeve can be replaced rapidly; only the oil in the high-voltage hoisting seat, instead of the oil in the overall transformer, is processed, so that the power supply recovery time is greatly shortened; and therefore, the transformer structure is of great significance to the power supply recovery of the overall power grid.

The invention provides a control method for a sectionalizer. The actuation time of the sectionalizer is flexibly controlled through inverse time limit overcurrent protection characteristics, when overcurrents exist in a transmission line, the actuation time of the sectionalizer is short when the overcurrents are large, the larger delta t is, the quicker a set critical value t is reached through accumulation, the actuation time of the sectionalizer is long when the overcurrents are small, the smaller delta t is, the slower the set critical value t is reached through accumulation, and therefore the power supply restoration time of the transmission line can be well shortened. The actuation time is short when the overcurrents are large, and the probability in which the transmission line and equipment are damaged can be decreased. The invention further discloses a control terminal and system for the sectionalizer.

The invention discloses a detecting and positioning method of a bus coupler flashover fault in a subway alternating current power system. The method comprises the following steps: (1) all protection devices configured in a single power supply zone in the subway alternating current power system is connected to a unified GOOSE network, and the protection devices connected with the GOOSE network are provided with a GOOSE network communication capability; and (2) a bus coupler protection device performing fault detection and location inside each transformer substation realizes a decision logic, and when all the decision logics are met, the bus coupler protection device determines that the a bus coupling protected by the bus coupling protection device has a flashover fault and the bus coupler protection device alarms. The method of the invention can rapidly detect and locate the flashover fault point after the bus coupler flashover fault happens, so that the operating maintenance personnel can quickly restore the normal operation of the metro power supply system and the power supply recovery time is shortened.

The present invention relates to the technical field of power grids, in particular to a line system for a self-healing line. Several outdoor switch boxes are arranged between main power supply lines of two transformer substations. Outlet switches are arranged between the main power supply lines and the transformer substations. Two normally closed switches are arranged in the outdoor switch box andare connected with a protection system. The two normally closed switches are respectively connected with the main power supply lines of the two transformer substations. Contact switch boxes are alsoprovided, which are connected with the bus of a backup transformer substation through a backup line. The backup line is provided with outlet switches. The contact switch box is arranged between any two adjacent outdoor switch boxes. There is a pathway between the contact switch box and the outdoor switch box. The pathway between the contact switch box and the outdoor switch box is provided with normally open switches connected with a protective terminal. The contact switch box is provided with normally closed switches connected with the protective terminal on the backup line. The contact switch box is provided with a voltage sensor. The invention has the advantages of shortening the power restoration and improving the power supply reliability.

The invention provides an on-site coinciding type fault isolation method and system. The method comprises the steps of controlling a transformer substation outgoing breaker or a first section breaker of a main feeder for sequentially forming tripping and single shot reclosing, and isolating a main feeder fault; setting the action delay time of a branch circuit breaker to be shorter than the action delay time of the transformer substation outgoing breaker and the section breaker, and controlling the branch circuit breaker to sequentially perform tripping and single shot reclosing to isolate a main feeder branch circuit fault; setting the action delay time of a user dividing circuit breaker to be shorter than the action delay time of the transformer substation outgoing breaker, the section breaker and the branch circuit breaker, and performing controlling. Compared with the prior art, the on-site coinciding type fault isolation method and system can reduce the tripping frequency of the transformer substation outgoing breaker and further shorten the fault isolation time and the power supply recovery time of a non-fault region.

The present disclosure provides a multi-port hybrid DC circuit breaker with self-adaptive reclosing and a control method thereof, including multiple ports, and each port sequentially passes through a load transfer switch, a mechanical switch, a residual current switch and a one-way main break switch. Connected at one end; the second end of the main break switch is connected to the first end of the energy dissipation resistor through a current limiting resistor, the current limiting resistor is connected in parallel with a bypass switch, and the second end of the energy dissipation resistor is connected to the negative end of the first diode connection, the positive terminal of the first diode is grounded; the connection between the load transfer switch and the mechanical switch corresponding to each port is connected to the first end of the energy dissipation resistor through the second diode; The energy consumption time and energy consumption pressure of the arrester have the function of adaptive reclosing, which can greatly reduce the impact of transient faults on overhead lines, greatly shorten the power supply recovery time after a transient fault occurs in the DC power grid, and avoid permanent faults in the event of a fault. The hazards that may be caused by reclosing the DC circuit breaker in the event of a permanent fault.

The invention relates to the technical field of 10KV power distribution network lines, and particularly relates to an emergency closing device for a power grid 10KV distribution line permanent magnet intelligent circuit breaker. The invention aims to solve the technical problems that closing can not be performed because of a fault, maintenance is not convenient and production cost is high. In order to solve the technical problem, the invention provides the emergency closing device for the power grid 10KV distribution line permanent magnet intelligent circuit breaker. The device is mainly composed of a shell, a PLC, a partition plate, a sliding column mechanism, a switching mechanism and a base mechanism and is directly installed in a permanent magnet intelligent circuit breaker so that the problem that the permanent magnet intelligent circuit breaker cannot be closed manually after the fault occurs is solved. Closing power supply of a power grid power supply line can be recovered under the condition that an original controller cannot work due to a power loss, emergency closing operation can be performed on a circuit breaker under the condition that an internal power supply, communication, guidance, control and software and hardware systems of the original controller have independent faults or cascading faults or even have all faults, operation is simple, the structure is small, production cost is low, and carrying is convenient.

The invention discloses a method and device for discriminating a fault section in a hub area based on power flow analysis, which includes a power supply module connected to an internal connection module, a CPU module and a wireless communication module; obtains voltage and current data at the feeder line of a traction substation; Transmission obtains the current and voltage data of the incoming and outgoing lines of multiple switching stations and the current and voltage data of the switching station feeders; establishes the current and voltage data of each section; judges the section where the short-circuit fault occurs through the current relationship between nodes. The beneficial effect is that the short-circuit fault section can be quickly judged through the node current and the node power matrix, and the fault section can be quickly isolated, which solves the difficulty in judging the fault section of the ring network power supply in the hub area and the leapfrog tripping of the switch feeder fault, and improves the traction power supply in the hub area. The intelligent fault discrimination level of the system shortens the recovery time of the traction power supply system in case of a short circuit, improves the adaptability of the traction power supply system to transportation, and improves the transportation quality.

The invention discloses a master-slave fault self-healing control method and system for a power distribution network. The method comprises the steps of determining a master-slave fault self-healing control architecture of the power distribution network, adopting distributed slave control, controlling an interconnection switch to act, completing power supply recovery of a power-losing area, adopting centralized master control, solving an optimal combination of the interconnection switch and a section switch of the power distribution network, and adjusting the operation state of the power distribution network to recover to the optimal state; according to the measurement data of the power distribution network measurement unit, initializing a power distribution network topological structure and electrical quantity parameters after the fault branch is removed, wherein the electrical quantity parameters comprise node voltage, branch current and load power; executing a power distribution network fault self-healing slave control scheme, and formulating a to-be-recovered power distribution network interconnection switch action scheme; and executing a power distribution network fault self-healing control master control scheme, calculating an optimal combination of all section switches and interconnection switches of the network, and optimizing the running state of the power distribution network.

The invention discloses a panoramic perception self-healing system and method for a power distribution network. The system comprises a sampling module, a communication module, a fault isolation module, a self-healing gate module and a backup protection module. The method comprises the following steps that: self-healing terminals acquire analog quantity, switch state and operation information of each accessed interval in real time; a plurality of self-healing terminals are connected to form a looped network, and data sharing is performed on analog quantity, on-off states and operation information in the looped network; when a fault occurs in the protection range of the self-healing terminals, the fault area is isolated; a self-healing charging function is carried out, the voltage condition of a fault side is checked, and power is supplied when the voltage is abnormal; and when the power distribution network has an abnormal phenomenon after fault isolation or power supply recovery, a protection function is started. According to the invention, the fault isolation and the self-healing gate can be carried out on the local terminal, and the purposes of real-time decision making and rapid control are achieved.

The invention discloses a panoramic perception self-healing system and method for a power distribution network. The system comprises a sampling module, a communication module, a fault isolation module, a self-healing gate module and a backup protection module. The method comprises the following steps that: the self-healing terminal acquires analog quantity, switch state and operation information of each accessed interval in real time; a plurality of self-healing terminals are connected to form a looped network, and data sharing is performed on analog quantity, on-off states and operation information in the looped network; when a fault occurs in the protection range of the self-healing terminal, the fault area is isolated; carrying out a self-healing charging function, checking the voltage condition of a fault side, and supplying power when the voltage is abnormal; and when the power distribution network has an abnormal phenomenon after fault isolation or power supply recovery, a protection function is started. According to the invention, the fault isolation and the self-healing gate can be carried out on the local terminal, and the purposes of real-time decision making and rapid control are achieved.

The invention relates to the technical field of power systems, more particularly to a multi-stage power grid collaborative self-healing system and self-healing method. A first standby self-switching device receives a protection action signal emitted by a first transformer protection device. A second ring network self-healing device receives the protection action signal of a second line protectiondevice and a bus protection device and the action failure signal of a first section standby self-switching device. A second standby self-switching device receives the protection action signal of a second transformer protection device and the action failure signal of the second ring network self-healing device. A third ring network self-healing device receives the protection action signal of a third line protection device and a third bus protection device and the action failure signal of a second section standby self-switching device. When a short circuit fault occurs in the system, the self-healing system at all stages makes logical judgment according to the collected signals and closes the open-loop point switch to restore power supply to the non-fault power loss area so that the power supply recovery time can be shortened and the workload of fixed value setting can be reduced.

The invention discloses a fault location method and system suitable for multi-branch lines of electrified railways. By installing on-site acquisition units on each branch line, including phase-splitting lines and hub station multi-branch lines, each on-site acquisition unit can be collected according to real-time The current of the line at the location and the line-to-ground electric field are used to determine the start-up of the local collection unit. The activated local collection unit collects the fault current of the branch line where it is located, and the fault current of the non-started local collection unit is zero; according to each branch The distribution characteristics of the fault current of the line, determine the location of the branch line where the fault point is located, and use the reactance method to accurately locate the fault of the multi-branch line, provide a reliable basis for the fault repair of the electrified railway branch line, and shorten the power supply recovery time.

The invention provides a power supply line fault detection method based on a comparison method, the wire inlet end of each terminal power distribution cabinet is connected with a detection unit, and the detection unit comprises an alarm element and a contactor with a coil and a spring; during normal power supply, the coil is electrified to enable the contactor to act, the wire outlet end of a terminal power distribution cabinet is electrified, and the alarm element is in a short-circuit state; when a power failure occurs, the alarm element is connected with the contact of the contactor under the action of the spring, so that the alarm element is connected in series with each resident line at the outgoing line end of the terminal power distribution cabinet; when power failure detection is carried out, a low-voltage test power supply is connected between the zero line and the live line of a main power supply line, at the moment, the contactor does not act, the alarm element is powered on to give an alarm, and the alarm characteristic sent by the alarm element corresponding to the air switch which cannot trip is stronger than the alarm characteristics sent by other alarm elements. By comparing the alarm characteristics sent by the alarm element, the air switch with a problem can be quickly found, and the power supply recovery time is greatly shortened.

The invention discloses a circuit breaker and a tripping device thereof. The tripping device comprises a tripping assembly and an indicating assembly, the indicating assembly is provided with an indicating piece capable of extending out through an indicating port in a shell of the circuit breaker, and the indicating piece is in linkage with a tripping pull rod and can move in the second direction so as to be switched between an extending working position and a retracting working position. The tripping device is configured as follows: when the tripping pull rod is located at the tripping working position, the indicating piece is switched to the extending working position; and when the tripping pull rod is located at the initial working position, the indicating piece is switched to the withdrawing working position. By applying the scheme, a maintainer can conveniently and quickly judge the under-voltage tripping state so as to effectively accelerate power supply recovery and provide a good technical guarantee for ensuring power utilization in production and living.

A signal amplitude based rapid accurate fault diagnosis system of a high voltage transmission line comprises a signal collection method, a signal processing module, a fault classification module, a fault phase signal extraction module, a fault phase signal processing module and a fault positioning module which are connected successively via an interference-free line. The system has the advantagesthat when a fault occurs in the high tension transmission line, features can be extracted from a fault signal needless of any feature extraction algorithm, the faults can be classified rapidly via simple filtering and interception according to a collected three-phase fault voltage / current amplitude signal, a corresponding voltage / current amplitude signal of the fault phase can be extracted according to the fault type, and the fault position can be located accurately via simple filtering, and the fault diagnosis method including classification and location then can be used to eliminate the fault rapidly, shorten the power recovery time, and ensures safe, stable and economical operation of the power grid technically.

The invention discloses a distribution line three-section type current protection configuration method based on a virtual circuit breaker. The method comprises the steps of A judging whether a circuit breaker with mismatched protection exists or not; B judging whether a branch without a circuit breaker exists in the protection range of the circuit breaker with mismatched protection or not; C setting a virtual circuit breaker; D setting the circuit breaker with mismatched protection to be in a mismatched protection state; E setting the protection fixed value of each circuit breaker on a to-be-detected line again; F continuing to judge whether a circuit breaker with mismatched protection exists or not; if yes, setting the circuit breaker with mismatched protection to be in a mismatched protection state, and then returning to the step E; and if not, entering the step G; G judging whether a fault indicator is installed at the head end of the branch; and H linking the fault indicator installed at the head end of the branch with the upper-level circuit breaker with mismatched protection. According to the invention, the mismatch phenomenon caused by the fact that a local branch is not provided with a circuit breaker can be avoided.