36results about How to "Achieving power restoration" patented technology

The present invention discloses a apparatus and method for automatic isolation of fault section of short circuit fault of power distribution network overhead network and single-phase earth fault, and power supply automatic recovery of non-fault section, which is suitable for power distribution network electric network overhead network of 3-10kV. The principle of automatic isolation and power supply automatic recovery is as following: mount a plurality of voltage type recloser on the overhead network to separate the network into a plurality of sections; when fault occurs, a relay protection device or a line selection device transmits signal to automatically break off or close a faulty line outlet breaker according to preset delay time and action sequence, and then coordinate with the network recloser; determine fault section through one time reclosing; isolate fault section through secondary reclosing and then recover power supply in non-fault section. At the same time, a detection terminal installation mounted on a substation can automatically judge section where the fault in, and transmit the fault message to a scheduling background while transmitting to designated customers in short message way. The present invention is provided with mature technology and high reliability.

The invention provides a small current grounding fault processing method with a line selection device and a protection recloser cooperated and belongs to the field of power system relay protection. The method is characterized by including the following steps that a, fault lines are judged; b, a tripping instruction is sent in a delayed mode; c, whether faults exist or not is judged, the step d is executed if the faults exist, and the step f is executed if the faults disappear; d-e, the fault lines are reclosed; f, whether the faults reappear or not is judged, the step g is executed if the faults do not reappear, and the step h is executed if the faults reappear; g, the fault lines are restored to normal power supply; h, the tripping instruction and a recloser locking instruction are sent. By means of the small current grounding fault processing method with the line selection device and the protection recloser cooperated, fault lines which are wrongly judged and can be self-cured through tripping arc blowout are subjected to power supply again after being tripped and the fault lines with faults incapable of disappearing by themselves are isolated through the line selection device, so that power supply reliability is greatly improved.

The invention particularly discloses an automatic rapid protection control method of a novel feeder. The automatic rapid protection control method comprises the following steps of: 1, mounting an STU (smart terminal unit) on each circuit switch and each interconnection switch in a network distribution structure, configuring a protective element into each STU, connecting the adjacent STUs, forming an annular network, and finally, connecting the annular network to an automatic main station of the feeder; 2, configuring each element in network distribution; 3, rapidly identifying a fault by the STUs according to local and adjacent current information and switch position information; 4, transmitting the fault identifying result to the adjacent STUs and the automatic main station of the feeder through a communication network by the STUs, and 5, carrying out isolation and power supply restoration on the fault. The automatic rapid protection control method has the beneficial effects that: an FTU (feeder terminal unit) in an original feeder is upgraded into the STU with intelligent judgment ability; and the fault section can be rapidly located by the local and adjacent current information and switch position information, so that isolation of a fault area and the power supply restoration of a non-fault area are achieved.

The invention relates to a microprocessor-based embedded socket adopting an infrared remote control signal decoding mode. The embedded socket comprises an external power interface, a main board and an output interface, the main board comprises a microprocessor, an infrared receiving module, a direct-current voltage stabilizing power module, a two-way relay driving module and a current detection module. The embedded socket acquires current signals of the output interface, and automatic power off is realized to protect load components when a load current is overhigh; when the load current is a standby current, power is automatically cut off to realize a function of power saving. By the infrared remote control signal decoding mode, decoding of any keys of any infrared remote controls can be realized without infrared signal match learning, and power restoration of the embedded socket is realized. In addition, functions of electric shock prevention and automatic power off can be realized, operations in power restoration are pretty convenient, and functions of master control and control acceptance can be realized.

The invention discloses a line selection device and protection non-fault-trip prevention cooperation small current grounding fault processing method, and belongs to a power system relay protection field. The line selection device and protection non-fault-trip prevention cooperation small current grounding fault processing method comprises steps that step 1001, the line selection device is used to determine a faulted line; a step 1002, the line selection device is used to control the trip-out of the faulted line; step 1003, the non-fault-trip prevention closing is executed; step 1004, the line selection device is used to determine whether the fault after the trip-out disappears; step 1005, the determining of the faulted line is wrong; step 1006, the determining of the faulted line is right; step 1007, whether the fault occurs again is determined; step 1008, the faulted line is restored; step 1009, a trip-out and non-fault-trip prevention locking instruction is transmitted; step 1010, the faulted line is isolated. The line selection device and protection non-fault-trip prevention cooperation small current grounding fault processing method is advantageous in that after the faulted line is determined by the line selection device, a trip-out operation circuit is directly controlled, and by adopting the cooperation between a trip-out control circuit and the non-fault-trip function of the protection device, the isolation of the small current grounding fault is realized.

The invention discloses a single-phase grounding fault automatic processing method and processing system. The faulty phase-grounding type arc extinguishing device configured on the busbar of the power station and the internally integrated faulty phase-to-grounding incremental principle and fault The terminal based on the phase-to-ground disconnection incremental principle, when a single-phase ground occurs on the distribution line, the terminal uses the disturbance information caused by the action process of the faulty phase-to-ground type arc extinguishing device to realize the section positioning alarm of the instantaneous single-phase to ground fault It is isolated from the nearest tripping of permanent single-phase grounding faults, and further combined with the delay closing function after the loss of voltage on one side of the contact switch configuration, and cooperates with the terminal fault phase grounding disconnection of the terminal along the distribution line. The protection action delay time Two sets of fixed values ​​according to different tidal current directions are adopted to realize the restoration of power supply in the healthy section downstream of the permanent single-phase ground fault section.

The invention discloses a topology structure of a cascaded flexible AC link converter, which includes a three-phase AC power supply, three power adjustment units, three Buck-type direct AC-AC converters UT-AC, and a three-phase multi-winding isolation transformer , 3 LC low-pass filters; wherein, each power adjustment unit is composed of two bipolar direct AC-AC converters BT-AC. The topology structure of the present invention can control the power flow between the interconnected feeders, and realize the flexible interconnection of the distribution network feeder. In the case of faults, the recovery power supply for the isolated load can be realized; through the flexible interconnection of the feeder lines in the distribution network, the distributed The penetration rate of power generation in the distribution network improves the power quality and power supply reliability of the distribution network.

The invention discloses a distribution line first-section fault processing method under a non-interactive condition. Through substation outgoing line protection time constant value matching and logical action and through fault recovery under the condition of automatic communication of a distributed feeder, the fault at the first section of a substation outgoing line is isolated and power supply in a non-first-section-fault region is recovered under the condition that substation exit protection and a first distribution line terminal cannot carry out information interaction. The solution can only be that fault processing of the line is taken as a blind spot, namely, feeder automatic fault isolation of the first section of the line is not considered, and if the first section of the line fails, exit action is protected by the outgoing line only, and the fault is removed by powering off the whole line. The fault region cannot be isolated automatically, and power supply in the non-first-section-fault region cannot be completed.