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

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 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 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.

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 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 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 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.