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2660results about How to "Achieve isolation" patented technology

DG (distributed generation)-containing power distribution network distributed protection and control method

The invention discloses a DG (distributed generation)-containing power distribution network distributed protection and control method, and provides a protection and control technical method based on an AFTU (advanced feeder terminal unit) for the phenomenon that the high-permeability distributed power access power distribution network causes great difficulties in traditional power distribution protection and control. The method disclosed by the invention divides the DG-containing power distribution network into multiple areas capable of running as islands in advance according to the DG capacity and load. Circuit breakers and AFTUs are arranged at the feeder outlet, the DG access position and the area boundary, and the AFTUs are connected through an optical network. Each AFTU detects local electric quantity information in real time and performs information interaction with other AFTUs. The method disclosed by the invention quickly positions the fault section according to the local and neighbor electric quantity information, and realizes the fault isolation and island running. A reclosing and island network re-connection control strategy is designed by use of the related AFTU information.
Owner:YANTAI POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER +2

Fly-back street lamp illumination LED constant-current driving power supply with intelligent dimming function

The invention belongs to the technical field of electronics, and relates to a street lamp illumination LED driving power supply. The street lamp illumination LED driving power supply consists of a rectification filter circuit, a pre-stage fly-back DC-DC constant voltage source circuit, a post-stage DC-DC constant current source circuit and an intelligent PWM dimming control circuit, wherein the pre-stage fly-back DC-DC constant voltage source circuit consists of a power factor correction (PFC) and PWM control chip NCP1653, a light-coupled isolation detection circuit and an isolation switchingtransformer, and realizes input power factor correction and AC input-to-DC constant voltage output function together with the rectification filter circuit; and the pre-stage DC-DC constant current source circuit is a multi-path constant current output circuit, and each path of constant current output circuit is a Buck-type DC-DC converter with the same structure and realizes conversion from constant voltage to constant current. The intelligent PWM dimming control circuit controls the working state of each path of constant current output circuit through multi-path different control signals to realize intelligent dimming. Compared with the conventional common LED street lamp illumination driving power supply, the street lamp illumination LED driving power supply can save a large amount of peripheral circuits, has the advantages of low cost, small volume, intelligent controllable dimming and the like, and is suitable for batch production.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA

Automatic rapid protection control method of novel feeder

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.
Owner:SHANDONG UNIV

High-voltage direct-current direct-current (HVDC-DC) power electronic converter transformer

InactiveCN101795072AAchieve isolationNo need to change configurationAc-dc conversionDc-dc conversionCapacitanceLow voltage
The invention relates to a high-voltage direct-current direct-current (HVDC-DC) power electronic converter transformer comprising a cascade modular converter (1), a double-winding medium or high-frequency transformer (2) and a fully-controlled H bridge (3). The cascade modular converter (1) consists of two same bridge arms, and the two bridge arms are formed by connecting the same number of sub-modules end to end in a cascading way; the middle points of both the two bridge arms are respectively connected with two leads of the primary side of the double-winding medium or high-frequency transformer (2); and the secondary side of the double-winding medium or high-frequency transformer (2) is directly connected with the fully-controlled H bridge (3) or is connected in series with a resonant capacitor (5) between the double-winding medium or high-frequency transformer (2) and the fully-controlled H bridge (3). The HVDC-DC power electronic converter transformer can realize the conversion of the high-voltage DC voltage and the low-voltage DC voltage and has the electrical isolation function. Compared with the prior HVDC-DC converting device, the HVDC-DC power electronic converter transformer has the advantages of small volume and light weight.
Owner:INST OF ELECTRICAL ENG CHINESE ACAD OF SCI

Method based on topology protection of distributing network

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.
Owner:NR ELECTRIC CO LTD +1

Ball joint locking method and device

ActiveCN103610555AAchieve instant multi-point lockAchieve isolationJointsOperating tablesEngineeringSacroiliac joint
The invention provides a ball joint locking method and a locking device designed according to the method. A ball head of a ball joint is sleeved with a connecting sleeve which can be movably locked with the ball head or be in a release state with the ball head. An abutting assembly connected with a hydraulic system is arranged in a position corresponding to a matching position of the ball head and the connecting sleeve at locking time. Under the action of pressure oil provided by the hydraulic system, the abutting assembly is forced to instantly press the outer surface of the ball head and enables the ball head to abut against the position matched with the connecting sleeve at the same time, so that the abutting assembly and the connecting sleeve lock the ball head in a multipoint mode. When pressure is released, the abutting assembly and the connecting sleeve can restore to original positions automatically, so that the locking state and the release state of the ball joint can be switched quickly. According to the ball joint locking method and the locking device, the characteristics that the hydraulic system is small in inertia and quick in response are fully utilized, so that that the device have the advantages of being simple in structure, reliable in locking, and good in effect, and can ensure rigid connection and bear certain load moment at the same time. Moreover, locking devices can be connected in series through the same oil path for utilization in one product.
Owner:SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI

Virtual resource slice management method and apparatus of power optical fiber access network

The invention provides a virtual resource slice management method and apparatus of a power optical fiber access network. The method includes: receiving slice requests generated for users according tobusiness requests of different users by an optical network unit ONU; dividing an optical line terminal OLT of the power optical fiber access network into a plurality of virtual OLTs based on resourceinformation of the slice requests and the business requests of the users, and performing slice resource configuration according to the plurality of virtual OLTs to obtain a plurality of slice resources; and respectively distributing the plurality of slice resources to the users and / or businesses corresponding to the business requests of the different users. According to the method and apparatus, the physical OLT is divided into the plurality of virtual OLTs to realize slice configuration, different users or different businesses are divided into different network slices according to user requirements to satisfy differentiated network requirements of the users, business isolation is realized, the network reliability is improved, and the maximization of the utilization rate of the resources of the electric power optical fiber access network is realized.
Owner:STATE GRID LIAONING ELECTRIC POWER RES INST +2

Shield tunneling machine for tunnel connecting passageway and connecting passageway tunneling method of shield tunneling machine

The invention belongs to the technical field of tunnel construction equipment, and relates to a shield tunneling machine for a tunnel connecting passageway and a connecting passageway tunneling method of the shield tunneling machine. The shield tunneling machine comprises a start end supporting walking platform and a receiving end supporting walking platform which are respectively arranged on material transportation rails in two main tunnels, a shield tunneling machine main unit, a counterforce supporting frame and a main tunnel supporting assembly which are respectively arranged on the start end supporting walking platform and a corresponding main tunnel duct piece, and a start end socket sealing assembly and a receiving end socket sealing assembly which are respectively arranged at the start end and the receiving end of the connecting passageway, wherein a duct piece hanging assembly is arranged on the start end supporting walking platform; a jacking tunneling assembly is arranged between the counterforce supporting frame and the shield tunneling machine main unit. The shield tunneling machine can realize automatically mechanical excavation; the labor intensity is greatly reduced, the energy consumption is reduced, and the cost is reduced; meanwhile, equipment construction is stable, and the efficiency is high; settling of the ground is effectively controlled, and the construction risk is reduced.
Owner:CHINA RAILWAY ENGINEERING EQUIPMENT GROUP CO LTD

Credible platform and method for controlling hardware equipment by using same

The invention relates to a credible platform and a method for controlling hardware equipment by using the same, belonging to the field of a computer. The credible platform comprises the hardware equipment and a credible platform control module with the function of active control, wherein hardware units, such as an active measure engine, a control ruling engine, a working mode custom engine, a credible control strategy configuration engine, and on the like, are arranged in the credible platform control module so as to realize the control functions of actively checking working mode configuration information, control strategy configuration information, firmware codes and circuit working states, and on the like for the hardware equipment. Through the identity legitimacy authentication and theactive control of the credible hardware equipment, which are realized by the credible pipeline technology, the active control and active check function, the security control system of credible hardware equipment which can not be bypassed by the upper layer can be stilled provided for the accessor of credible platform in incredible or lower-credibility computing environment without modifying the computing platform system structure and obviously reducing the system working performance.
Owner:BEIJING UNIV OF TECH

Critical temperature testing system of gunpowder and explosive thermal explosion

The invention discloses a critical temperature testing system of gunpowder and explosive thermal explosion, comprising a temperature-rising heating unit, a reactor unit, an automatic sample feeding unit, a pressure detection unit and a computer, wherein the temperature-rising heating unit comprises a heat-conducting layer, a heat preservation layer, and a single-cavity heating furnace body containing three groups of heating layers and ceramic heat-isolating layers; and the temperature and the temperature-rising speed of the heating furnace body are controlled by the computer. The reactor unit comprises a testing furnace cover, a lifting basket, a sample tank and a pre-heating furnace cover; the automatic sample feeding unit comprises a furnace body bracket, two stepping motors, a pulley wheel and a steel wire rope; the air pressure detection unit comprises a pressure sensor; the pressure sensor is mounted in the sample tank through the testing furnace cover and is connected with the computer; and the computer is provided with a data acquisition card, an image display control piece and a data processing unit. When the critical temperature testing system is used, a gunpowder or explosive sample with the certain size is placed into a special explosion-proof furnace and the sample is heated at the equal temperature or temperature-rising condition, so as to detect the thermal explosion critical temperature when the sample is combusted or exploded.
Owner:XIAN MODERN CHEM RES INST
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