42results about How to "Reduce blackout area" patented technology

The invention discloses a method based on the topology protection of a distributing network, which comprises the following steps: (1) all distributing automation terminals respectively form a distributing network topology structure, and each distributing automation terminal is linked with adjacent nodes in a lateral communication mode; and (2) whether each switch is an adjacent node is judged based on a line failure criterion; if yes, the network topology protection corresponding to the switch is activated to trip the switch of the node; and otherwise, the network topology protection is not activated, wherein the line failure criterion is as follows: if the switch is not a transformer substation outlet switch and a line overcurrent failure is detected in one and only one of N adjacent nodes, the fact that the switch is a failed adjacent node is judged; and if the switch is a transformer substation outlet switch and a line overcurrent failure is detected in one and only one of N nodes including the transformer substation outlet switch, the fact that the transformer substation outlet switch is a failed adjacent node is judged. The method can rapidly, accurately and selectively position the failure and isolate the failure.

The invention provides a power distribution network dynamic power restoration method based on a load curve, which belongs to the technical field of power distribution system automation. The method utilizes a computer, realizes computing through programs and comprises the steps of inputting basic parameters; computing active load and reactive load of each node in each hour and determining a grid structure in normal operation; determining a fault section, a power supply path of the power side of the fault section and a grid structure after failure isolation; applying a traditional genetic algorithm to determine a candidate grid structure set of the least loss load in each hour during fault restoration; finally determining the optimum dynamic power restoration scheme during fault restoration. The method fully utilizes the load curve, and the dynamic restoration scheme is formulated by hour, so that the grid structure changes along with the change of the load during fault restoration, and accordingly, the method has the characteristics of being capable of effectively reducing power failure areas caused by fault, shortening power failure time for users, reducing the power failure loss of the users, and the like. The method can be widely applied to power distribution network power restoration.

The invention provides a visual multi-point-of-contact power distribution network fault section association method. The method includes single line diagram generating flow which includes performing modeling of power grid data, and drawing a CAD single line diagram; fault section division flow which includes adding user information according to the CAD single line diagram, dividing the CAD single line diagram into a protection isolation section, a smallest fault search section, a preliminary fault search section, a smallest fault partition section and a smallest fault isolation section, and dividing, displaying and outputting operation of fault processing flow in a mode of using different colors; fault section association flow in which association of a fault section is performed on a division result of the protection isolation section, preliminary fault search section and smallest fault partition section with an iterative method; and power supply reliability analysis flow in which faulttime is obtained according to a fault section association partition result, and power distribution network reliability analysis of multiple points of contact is performed. The visual multi-point-of-contact power distribution network fault section association method provided by the invention can rapidly perform association, make statistics of the power failure user number and power failure line length of different stages during feeder fault accident handling, and make a power supply reliability analysis.

The invention relates to a local smart feeder automation no-delay stage difference coordination method and application. The advantage of local insulation of relay protection and the advantage of self-recovery of feeder automation are combined, when a circuit breaks down, preferentially, local insulation is conducted through the relay protection function of a feeder terminal, and thus the outage range is reduced to the maximum degree. If transformer substation protection time has a low time-delay margin or does not have a time-delay margin, it is difficult for a transformer substation and the feeder terminal to form delay stage difference coordination to ensure protection selectivity. At this time, through a local smart failure processing mode of the feeder terminal, local failure processing can be completed, no in-station power supply is influenced, and in-station protection simply serves as backup protection of feeder protection. If instant quick break protection is applied to the transformer substation, the portion where a first-stage section switch is located needs to be protected, and the coordination is formed through a protection range.

The invention relates to an on-site intelligent full-delay stage difference coordination method employing feeder automation and an application. The advantages of ''on-site isolation'' of relay protection and ''self-recovery'' of feeder automation are combined and the power outage range is preferentially reduced to the greatest extent through the on-site isolation of relay protection in case of a line fault; and if the time delay margin of substation protection is large, full-delay stage difference coordination is formed through the substation protection and a feeder terminal to ensure the protection selectively, that is to say, the fault of any point is isolated through local protection, a non-fault area is not powered off and function self-recovery is achieved through the feeder automation in a transient fault.

The invention discloses a method and a device for connecting an inlet wire and an outlet wire of a low-voltage cable branch box. A modular structure is adopted; the connection of the inlet wire and the outlet wire of the low-voltage cable branch box is divided into three parts, i.e. a bus system, an inlet wire module and an outlet wire module; the inlet wire is connected to the bus system through the inlet wire module; and the outlet wire is also connected to the bus system through the outlet wire module. The connection way of the inlet wire and the outlet wire comprises the steps that an inlet wire cable is connected to the inlet wire module, the module is connected to the bus system, meanwhile the outlet wire is connected to the outlet wire module, the outlet wire module is connected to the bus system, and the whole connection of the inlet wire and the outlet wire is finished. The method and the device have a high protection level, a load switch can switch total load current and certain short-circuit current; an obvious off point is provided to reducing the probability of shock accidents; due to a plugging way, the device is simply and conveniently mounted; due to high reliability, the power-off area is reduced during a failure; due to moveable parts, the device is free of maintenance and can be applied in a severe environment; and due to modularization, the device is easy to expand.

The invention discloses an energy-saving device based on low-voltage line load balance. The energy-saving device comprises a low-voltage master control switch, wherein the first end of the low-voltage master control switch is connected with the secondary side of a transformer, a primary side of the transformer is used for being connected with the power grid power supply end, the second end of the low-voltage master control switch is connected into a low-voltage bus, a multiple balance power distribution lines are further connected onto the low-voltage bus and are series circuits formed by sequentially connecting a wire outlet switch and N sectioned switches, the wire outlet switch is connected into the low-voltage bus, and the tail ends between every two balance power distribution lines are connected through an interconnection switch and form a low-voltage loop. The low-voltage master control switch and the wire outlet switch on each low-voltage master control switch are connected with a load balance controller through an independent communication channel, and the N sectioned switches on each balance power distribution line are connected with the load balance controller through an independent communication channel. The line heavy load or overload problem caused by unbalanced line load is solved, and the whole line outage caused by faults or overhauling is avoided.

The invention belongs to the field of power supply and distribution of low-voltage systems and solves the problem that the current-carrying capacities of main cables or main busbars are not reasonably matched with the passing current in the full path in the mode that a power supply circuit is connected with a plurality of electrical units. The system adopts the mode that the main cables or main busbars with different sectional areas are connected according to stepped variation of the current-carrying capacities and is provided with one-circuit sectional variable diameter main cables or main busbars. The main cables or main busbars are connected with a plurality of electrical units. The current-carrying capacities of the cables or busbars are reasonably matched with the passing current on the whole sections of the main cables or main busbars. Meanwhile, secondary circuit breakers are arranged on the variable diameter parts of the main cables or main busbars and are used for sectional protection of the cables or busbars with different current-carrying capacities in the same circuit together with a main circuit breaker. In the method, the main and secondary circuit breakers act timely when the main cables or main busbars have faults while the materials and the manufacturing cost are saved, not only the requirement of power supply reliability is satisfied, but also the fault range is accurately judged so as to be convenient for rush repair.

The invention discloses a power distribution emergent repairing system capable of fully perceiving and monitoring operation of a power distribution network. The system comprises a control layer, an equipment state monitoring mechanism in signal interconnection with the control layer, a power grid state management and control mechanism which is matched with the equipment state monitoring mechanismand is in signal interconnection with the control layer as well as an automatic execution mechanism which is in signal interconnection with the control layer and used for executing corresponding operation of the equipment state monitoring mechanism and the power grid state management and control mechanism, wherein the control layer comprises a data processing module, a display module in signal interconnection with the data processing module, a data interaction module in signal interconnection with the data processing module, a mobile intelligent terminal in signal interconnection with a data exchange module as well as an emergent repairing information push module in signal interconnection with the data processing module. The system can fully perceive the equipment state and the circuit operation state of the power distribution network and timely sends fault information to relevant responsible people of the power distribution emergent repairing center, so that people concerned timely processes faults, the power service interruption time is shortened, and the power supply reliability is improved.

An integrated monitoring and controlling system for a looped network unit comprises a looped network unit front-end controller, a looped network unit data acquisition system and a background system, wherein the looped network unit data acquisition system is connected to the looped network unit front-end controller and transmits acquired data to the looped network unit front-end controller in realtime, the looped network unit front-end controller controls a device connected to the looped network unit front-end controller according to the data of the looped network unit data acquisition systemand is connected with the background system and used for transmitting data to the background system, the background system performs processing analysis and storage and is in communicating connection with the looped network unit front-end controller, processed data is used for the looped network unit front-end controller, the background system sends out a control instruction to control the looped network unit front-end controller to give an alarm and to be remotely connected to a to-be-controlled device of the looped network unit front-end controller. The system can comprehensively monitor a running state of a looped network unit device and improves the running reliability of a power distribution network.

The invention provides an indoor intelligent 10 kV boundary circuit-breaker switch cabinet having a communication function. The indoor intelligent 10 kV boundary circuit-breaker switch cabinet comprises a cabinet body; an intelligent monitoring unit is arranged at the upper end of the front side of the cabinet body; and a line inlet side bus connection unit and a line outlet side boundary circuit-breaker unit are arranged at the lower end of the front side of the cabinet body. The indoor intelligent 10 kV boundary circuit-breaker switch cabinet disclosed by the invention has a boundary short-circuiting function of rapidly breaking T-type connection of a 10 KV major network while a user line inlet side has a fault, so that the power failure area is reduced; the indoor intelligent 10 kV boundary circuit-breaker switch cabinet has a function of uploading data information of a main station through communication; therefore, the position of a fault point is convenient to rapidly position; the power failure time is shortened; power supply is rapidly recovered; furthermore, the indoor intelligent 10 kV boundary circuit-breaker switch cabinet has a complete and powerful acquisition function of a user network; current measurement is realized through a protective CT (Captive Test); various data can be displayed accurately; historical operation parameters can be memorized and inquired; simultaneously, an on-pole (outdoor) boundary circuit-breaker can be completely replaced; by means of floor type installation, the indoor intelligent 10 kV boundary circuit-breaker switch cabinet is convenient to overhaul; the indoor intelligent 10 kV boundary circuit-breaker switch cabinet has a ventilation heating system outside a gas tank; three master devices including an integrated circuit-breaker, an isolation switch and an earthing switch are integrated in the gas tank; and the indoor intelligent 10 kV boundary circuit-breaker switch cabinet is small in volume, material-saving and low in manufacturing difficulty and cost.

The invention discloses a cable line fault isolation method, device and system. The method includes the steps of obtaining the zero-sequence current on the load side, judging whether the zero-sequence current exceeds a preset zero-sequence current value section or not, and controlling an intelligent dividing switch on the load side to be turned off if the zero-sequence current exceeds the preset zero-sequence current value section. According to the technical scheme, when the certain load side fails, only the intelligent dividing switch on the fault load side needs to be turned off, a circuit switch does not need to be turned off, and the power outrage area can be effectively narrowed.

The invention provides a rapid fault positioning method and system based on active power distribution network fault area division. The method comprises the following steps: carrying out partition division on a fault section of an active power distribution network; carrying out fault positioning on the divided fault sections by adopting a fault positioning mathematical model; wherein in the fault positioning mathematical model, a particle swarm algorithm is adopted to carry out particle swarm position and speed updating, then particle fitness is calculated, then a particle library is updated, whether an optimal objective function is zero or not is judged, and when the optimal objective function is zero or the highest number of iterations is reached, an optimal solution, namely the specific position of the fault, is output. According to the method, the power distribution network area is firstly divided, then fault positioning is performed, accurate fault positioning after the fault occurs is realized, the line patrol burden can be reduced, the power failure area is reduced, the fault repair time is shortened, rapid and accurate fault positioning of the power distribution network is further realized, and the power supply reliability of the power distribution network is improved.