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 multi-channel remote signal test device for a ring network cabinet and a test method thereof, and relates to the technical field of remote control signal test. The multi-channel remote signal test device for the ring network cabinet comprises an analog switch module A, an analog switch module 101, an analog switch module 102 and an analog switch module B. The multi-channel remote signal test method for the ring network cabinet comprises the steps of firstly, accessing a tester to the remote control loop of a ring network cabinet DTU; secondly, testing an initial state; thirdly, testing the state; fourthly, capturing and self-maintaining multi-channel remote signals; fifthly, recording a test result and checking the result. According to the invention, the device realizes the multi-channel test and four intervals can be continuously operated. Repeated confirming links are eliminated. Meanwhile, when one part inside the ring network cabinet or the switching-on outlet of the ring network cabinet is in wrong connection, the wrong connection can be directly reflected by the device. Therefore, the field test personnel can check and repair the wrong connection conveniently. Meanwhile, the wiring number is reduced through the standardized primary wiring operation by the device, so that the influence of human factors is reduced to the lowest.

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 a ring differential protection method and device for distribution network, which relates to the technical field of power network. The ring differential DTU device is arranged on a distribution station in a substation, and each DTU device is ring-connected through a gigabit optical fiber. The voltage and current data are sampled by a DTU device, and then a message is formedand sent out; Each DTU device sends the sampled value of the tie line and its own state information through the optical fiber ring network, and simultaneously receives the sampled value and the stateinformation of the equipment subscribed by the DTU device. When the launching fault occurs between two substations, the differential algorithm is used to trigger the differential action, and the circuit breaker of the two substations is disconnected and the fault is removed. A DTU device is use for collecting real-time data of whole line and establishing relay protection by utilizing line currentdifferential protection. That invention has the advantages of high reliability, fast operation speed, high sensitivity and good selectivity, thereby reducing power-off area and shortening power-off time.

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 discloses a broken wire on-load processing device for a low-voltage distribution insulated conductor and a processing method thereof. The processing device comprises insulated puncture wire clamps, a first insulated cable, a second insulated cable, a low-voltage air circuit breaker and a clamp on amperemeter, wherein the first insulated cable is connected with the second insulated cable through the low-voltage air circuit breaker; the clamp on amperemeter is arranged on the first insulated cable; and the insulated puncture wire clamps are arranged at the end parts of the first insulated cable and the second insulated cable and are connected with low-voltage distribution insulated conductors. The method shortens the power failure time, narrows the power failure range, is superior in the aspect of first-aid repair time, multiple power supply volume analysis and the like in comparison with the traditional power failure operation mode and has better economic benefit and social benefit. In addition, the invention has the advantages of convenient operation, low safety risk and the like.

The invention provides a power distribution network fault positioning method and system based on a micro PMU and dichotomy search. The power distribution network fault positioning method comprises thesteps of calculating a positive sequence component of a fault current at a fault point by utilizing a power supply before and after fault measurement by the micro PMU in a fault observable configuration and a current at a load, and injecting the positive sequence component into the assumed fault point to construct a positive sequence fault additional component network; performing fault point searching on lines on the basis of dichotomy in the positive sequence fault additional component network in sequence, and according to an admittance matrix formed in the search process and the positive sequence component of the fault current, obtaining voltage positive sequence fault component calculation values of all PMU configuration nodes; calculating voltage deviation norms between the voltage positive sequence fault component calculation values of all the PMU configuration nodes and actual measurement values, and determining fault positions corresponding to the minimum values of the positivesequence voltage deviation norms of the lines as candidate fault points; and screening out the candidate fault points corresponding to the minimum values of the positive sequence voltage deviation norms corresponding to the candidate fault points to serve as actual fault points.

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 low-voltage grounding fault point locator and a locating method. A test power supply is used for applying alternate-current voltage between a fault line and the ground whichare isolated to form current, the flow direction of current passing through a grounding point is measured by an insulating pole type wireless alternate-current clamp ammeter; then the locator gradually approaches an unknown fault point in the flow direction of current passing through the grounding point, until the low-voltage grounding fault point is found. By the method, the fault point is searched by a test power supply through municipal power in a site. Due to the current limiting effect of the test power supply, no matter field grounding adopts high resistance or low resistance, the test instrument is not damaged even if the grounding is unstable, and the accuracy of the test can be ensured.

The invention provides a user side low-voltage reactive power compensation device. The device is arranged between a main station and medium-low-voltage grid primary equipment. The device comprises a dual-core processor, a collector, a state quantity measurer, a video converter, mass storage equipment and a relay protection device, wherein the dual-core processor respectively receives voltage and current signals of the medium-low-voltage grid primary equipment collected by the collector, the state quantity of the medium-low-voltage grid primary equipment collected by the state quantity measurer and the digital video converted by the video converter, then performs data processing and transmits to the power distribution network main station, and controls capacitor banks of the low-voltage grid to realize the reactive power compensation; and when the device is in fault, the relay protection device is used for protecting the low-voltage reactive power compensation device. Through adding various functions such as video real-time monitoring, mass storage, high-speed communication into the conventional reactive power compensation device, the problems can be effectively solved, so that the state monitoring capability of electrical equipment is improved, and the accident hidden danger checking level of the electrical equipment is improved.

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 discloses a three-phase power system interphase short circuit processing method. A plurality of partition switches are arranged on a line, the plurality of partition switches divide the line into a plurality of protection areas, and a plurality of section switches are arranged in the protection areas; when an inter-phase short-circuit fault occurs in a line, the electric energy inlet partition switch cuts off fault current, then a detection loop comprising an inter-phase short-circuit fault point and a fault phase is constructed, controllable current is injected, and the section switch detects the controllable current and trips according to a preset condition so as to cut off the inter-phase short-circuit fault. According to the method, the interphase short circuit fault can be effectively removed, the power failure area can be reduced, and meanwhile, the use of a large-current cut-off switch can be reduced, so that the switch cost is effectively reduced.

The invention discloses a method for isolating in-station faults of a comprehensive power distribution terminal of a transformer substation, and comprises the following steps of (1) acquiring an in-station voltage and current signal by utilizing a voltage and current acquisition module; (2) establishing an incidence relation between a locking signal detection module of an interconnection wire inlet switch and a locking signal control detection module of an interconnection wire outlet switch; (3) when a fault occurs, enabling a control module to detect all fault current signals from the power source point to the fault point; (4) enabling a locking signal module close to the fault point of the interconnection wire outlet switch to give out a locking out signal; (5) enabling the locking signal detection module of the interconnection wire inlet switch to lock an outlet of the wire inlet switch and performing protecting without motion; and (6) enabling the control outlet module of the interconnection wire outlet switch to protect the action outlet, wherein the fault is isolated. According to the method, fault isolation and power supply can be performed in place, the communication dependence degree is low, and the structure is simple.

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 self-adapting voltage quick-break protection method of a distribution circuit. The method is realized in a time domain, a troublesome power frequency quantity extraction algorithm is effectively avoided, the data window needing calculaing is short, the calculated amount is small, the protective movement speed is greatly increased, and the quick operated requirement is met; and a protection principle has very strong adaptivity, and the self-adapting voltage quick-break protection method of the distribution circuit provided by the invention has the advantages of being not influenced by a failure mode and a system operation mode. The self-adapting voltage quick-break protection method of the distribution circuit provided by the invention is mainly used for relay protection of the distribution circuit of an electric system.

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.

One or more embodiments of this specification provide a GCS drawer type switchgear, including a cabinet body, several unit drawers are installed in the cabinet, connecting wires are installed at the rear end of the unit drawers, and a For the busbar, guide assemblies are installed on both sides of the unit drawer, one end of the guide assembly is installed with a clamping structure, and a clamping groove is provided in the cabinet, when the clamping structure is connected to the clamping When the grooves are matched, the connecting wires are connected with the busbars. The present invention provides a plurality of unit drawers, and the unit drawers are closed to each other, which is convenient to use. Each unit drawer is respectively connected to the busbars through the connecting wires, and the cabinet The space on the reverse side is large, which is convenient for wiring and connection of current transformers and electric meters. It is convenient for power outage maintenance, reduces the power outage area, and improves the reliability and safety of power consumption.

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 combined type transformer with an intelligent communication demarcation circuit breaker switch function. The combined type transformer comprises a cabinet body; a high voltage chamber is arranged at the left side of the front of the cabinet body; an intelligent communication demarcation circuit breaker switch cabinet is arranged at the inner part of the high voltage chamber; a main low voltage chamber is arranged at the right side of the front of the cabinet body; a low voltage incoming cabinet is arranged at the inner part of the main low voltage chamber; a low voltage chamber is arranged at the right side of the cabinet body; an outgoing cabinet and a capacitor cabinet are arranged at the inner part of the low voltage chamber; the low voltage parts are connected through a busbar. The combined type transformer with the intelligent communication demarcation circuit breaker switch function not only has a demarcation short-circuiting function of cutting off T joint of a 10 KV main grid rapidly when a user incoming side is in fault, but also has no need to consider the factors of components and parts such as thunderstorm prevention, mildew prevention and ageing prevention while having a complete and powerful collection function of a user network, so that the combined type transformer becomes smaller and more exquisite in volume; materials are saved, and manufacturing difficulty and manufacturing cost are reduced.

The invention provides a power distribution network fault positioning method and system based on a micro PMU and dichotomy search. The power distribution network fault positioning method comprises thesteps of calculating a positive sequence component of a fault current at a fault point by utilizing a power supply before and after fault measurement by the micro PMU in a fault observable configuration and a current at a load, and injecting the positive sequence component into the assumed fault point to construct a positive sequence fault additional component network; performing fault point searching on lines on the basis of dichotomy in the positive sequence fault additional component network in sequence, and according to an admittance matrix formed in the search process and the positive sequence component of the fault current, obtaining voltage positive sequence fault component calculation values of all PMU configuration nodes; calculating voltage deviation norms between the voltage positive sequence fault component calculation values of all the PMU configuration nodes and actual measurement values, and determining fault positions corresponding to the minimum values of the positivesequence voltage deviation norms of the lines as candidate fault points; and screening out the candidate fault points corresponding to the minimum values of the positive sequence voltage deviation norms corresponding to the candidate fault points to serve as actual fault points.

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.