34results about How to "Guaranteed quickness" patented technology

A sliding/swing-type portable digital communication apparatus including a main housing having a speaker unit positioned on its rear surface; key housings, each of which is positioned on a side of the main housing, the key housings being adapted to slide a predetermined distance toward or away from the main housing along a longitudinal direction for exposing or hiding the speaker unit according to whether or not the key housings have slid; and a swing housing adapted to rotate about a hinge axis, which is oriented perpendicular to the sliding direction of the key housings, within a predetermined range of angle while continuously facing an upper surface of the main housing and upper surfaces of the key housings for exposing and hiding predetermined areas of the key housings.

The invention relates to a distribution network topology error identification algorithm based on AMI measurement information, which is characterized by comprising the following steps: S1, calculatingthe voltage Upc of a coupling node to which each load belongs, and obtaining a coupling node voltage sample space to which the loads belong; S2, calculating the current I<L> of a branch to which eachload belongs, and obtaining a branch current sample space to which the loads belong; S3, calculating the voltage correlation coefficient and the current correlation coefficient of the loads accordingto the voltage and current sample spaces obtained in S1 and S2; and S4, completing topology calibration and correction. The running time required for identification is reduced. The quick action of topology identification is ensured, and the reliability and effectiveness of topology identification are ensured.

The invention discloses a protection method for a multilevel direct current distribution feeder line. The protection method is implemented according to the following steps specifically: step one, collecting the current ix(k) at the outlet of each level of direct current bus of the multilevel direct current distribution feeder line, and calculating a current increment measured value delta ix(k), wherein x is A, B, ..., M level, and k is the sampling number of the current at the outlet of each level of direct current bus; step two, judging the fault section of the multilevel direct current distribution feeder line; and step three, restarting a current converter. The protection method for the multilevel direct current distribution feeder line disclosed by the invention can be matched with the protection of the current converter, the fault section of the direct current feeder line can be identified correctly, a cutting fault is protected by a corresponding feeder line, and adjacent feeder lines are protected from operating falsely, so that the action selectivity of a direct current circuit breaker is guaranteed.

The invention provides a line differential protection method based on differential output of an electronic current transformer, and belongs to the field of power system relay protection. The technical scheme is that an integration element in high-voltage side data processing of conventional line differential protection is removed, and differential signals output by the sensing head of a Rogowski coil are directly used to realize longitudinal differential protection of a high-tension transmission line, and complexity of a device is reduced, and data processing time is reduced. On the basis of ensuring reliability and speed, adverse effect caused by an extra integral circuit is prevented, the method adapts to differential output of the Rogowski coil. PSCAD/EMTDC simulation experiments show that the differential protection scheme based on the current differential signals is effective and feasible, line rapid differential protection can be realized by directly using the differential signals output by the electronic current transformer, the integration element is removed. The method adapts to requirements of interfaces of the electronic current transformer, and can be used for main protection of high-tension transmission lines.

The invention provides a method for voltage regulation and compensation for magnetizing inrush current locking of a voltage transformer, relates to a method for relay protection of a power system andespecially relates to a method used for voltage regulation and compensation for magnetizing inrush current locking in an ultra high voltage power grid. The method includes calculating phase current ofdifferent sides of the voltage transformer and DC component, fundamental wave, second harmonics, third harmonics and waveform degree of asymmetry of different current of longitudinal differential phases of the voltage transformer, calculating a floating magnetizing inrush current comprehensive locking constant value; according to the above calculation result, calculating inrush current coefficient comprehensive criterion and comparing the criterion with the floating magnetizing inrush current comprehensive locking constant value, and giving a harmonic content mark; using fundamental current for calculation and setting a split-phase action mark; identifying whether it is magnetizing inrush current or interior failure according to the calculated split-phase action mark and the magnetizing inrush current locking mark and implementing protection over the voltage transformer. The method can ensure the quickness of no-load input when in-zone failure occurs and can also ensure reliable locking through a floating threshold when a value is approximate to the magnetizing inrush current interior constant value.

The invention relates to a topological information based self-adaptive current quick break protection setting method for a power distribution network. The technical feature is that the method includessteps of 1, performing tide calculation by utilizing known power distribution network power source equivalent phase potential and load power during normal operation of the power distribution network,obtaining node voltage of each bus, power of each branch circuit and power supplied by a power distribution network equivalent power source; 2, obtaining equivalent impedance of a power distributionnetwork line and load and the power distribution network power source equivalent impedance during normal operation of the power distribution network according to the result obtained in tide calculation in step 1; 3, establishing a Thevenin's circuit at a protection mounting position through calculating open circuit voltage and short circuit current at the protection mounting position, and obtaining an accurate setting value of self-adaptive current quick break protection setting. The method reduces protection setting calculation time after faults occur and ensures protection speed.

The invention relates to the technical field of the collection and the analysis of data, particularly the collection and the analysis aiming at running data of sensors, and specifically discloses an intelligent terminal for collecting and analyzing running data of multiple sensors. The intelligent terminal comprises a communication module and a control module, wherein the control module is of an ARM (Advanced Reduced instruction set computer Machine) and FPGA (Field Programmable Gate Array) dual-CPU (Central Processing Unit) structure; the communication module comprises an interface supporting standard MODBUS, IEC61850 and TCP-IP (Transmission Control Protocol-Internet Protocol) communication protocols, an RS485 communication interface, an Ethernet interface, an optical fiber communication port, a video interface, a voice bidirectional talkback module and a GPRS (General Packet Radio Service) communication 4G (Fourth Generation) module. The intelligent terminal can be used for collecting the running data of various sensors in real time, so as to realize the comprehensive management of functions of fault warning, daily management, quality evaluation, risk prevention and the like; the choosability, the quick-acting performance and the reliability of real-time fault detection are effectively guaranteed; the data under a fault is conveniently recorded in time and the treatment is carried out.

The invention discloses an inverse-time zero-sequence current protection method. The minimum motion time and maximum motion time of protection are set, motion time is allocated according to the minimum zero-sequence current and maximum zero-sequence current of over-current protection, and the motion time at the head end and the motion time at the tail end of the protected circuit of a curve are determined, so that the purposes that the whole curve is restrained and the speed of protection motion is improved are achieved; besides, the longest motion time of inverse-time zero-sequence current protection is increased, so that the speed and selectivity of protection are ensured at the same time. By means of the design, not only is the speed of protection ensured and improved, but also the selectivity of protection is ensured and improved.

The invention relates to a DC distribution network system, a fault location method and a fault location system. Whether a fault occurs in a DC distribution network is determined; if so, an actual voltage of a corresponding branch is detected; when the detected actual voltage is lower than a low voltage threshold, a protection alarm signal is generated; after delaying of first set time, the protection alarm signal is uploaded; and then the protection alarm signal is parsed and whether the fault point is located at the branch is determined according to the protection alarm signals at the branchand upper-level and lower-level branches of the branch. With the fault location method, reliable positioning of faults can be realized and the power supply reliability of the DC distribution network can be improved. Moreover, appropriate selecting is performed by the first set time; the fault can be quickly positioned; and thus quick action of the subsequent protection trip action is ensured.

The invention discloses a GOOSE network performance self-diagnosis method used for intelligent transformer substation relay protection. The GOOSE network performance self-diagnosis method is characterized by comprising the following steps that step SS1, a relay protection device measures GOOSE network time delay; and step SS2, the relay protection device emits early warning according to GOOSE network time delay of the step SS1. The achieved beneficial effects are that (1) the defect that an intelligent transformer substation cannot acquire time delay of a GOOSE network layer can be solved, the relay protection device of the intelligent transformer substation is enabled to possess a function of real-time diagnosis of GOOSE tripping network performance, reliability and quick action of the relay protection device of the intelligent transformer substation can be guaranteed and stability of a power system can be enhanced; and (2) the relay protection device can monitor the size of time delay of the GOOSE network in real time and give corresponding early warning information to notify operation personnel to perform timely troubleshooting, and time delay of the GOOSE network layer can be viewed in real time through the interface of the relay protection device so that the operation personnel can acquire the information more visually.

The invention discloses a method and a system for relay protection to avoid surge disturbance, belonging to the technical field of power system relay protection. The data damaged by surge disturbanceis judged and corrected to eliminate adverse effects. At least comprise that following step: step 1: real-time buffering sampling data; The cache length shall not be less than 20ms; 2, jud that disturbed sample data; 3, correct that disturbed data; 4, calculate that effective value by adopting a full-wave Fourier algorithm and jud the protection logic; 5, calculate that effective value by adoptinga half-wave Fourier algorithm and judging the protection logic; Step 6: Judge the protection action. By adopting the technical proposal, the invention improves the ability of the relay protection device to resist the surge disturbance, and simultaneously enhances the reliability and the speed of the relay protection device.

The invention relates to a method for isolating a small current grounding fault of a distribution network based on an area agent, which belongs to the technical field of distribution automation. The method includes the following steps: step a, setting the proxy area and the regional proxy terminal; step b, configuring the fault action time of the switch in the proxy area; step c, judging whether a small current ground fault occurs in the distribution network; step d, located at the fault point The upstream switch delays the action; step e, realizes the isolation of the fault point; step f, determines the contact switch that needs to be operated and closes the contact switch; step g, updates the topological network of the distribution network; step h, reconfigures the agent area Fault action time of internal line switch. This small-current ground fault isolation method based on regional agents in the distribution network does not rely on communication and master station systems by setting agent areas and regional agent terminals, and only relies on local traffic to achieve small-current ground fault isolation, which has higher reliability.

The invention discloses a protection control circuit for a power chip, which comprises a printed circuit board, and a data sampling module, an FPGA module and a switch control module which are integrated on the printed circuit board, an on-chip soft core CPU module is embedded in the FPGA module, the FPGA module is electrically connected with the on-chip soft core CPU module, the data sampling module and the switch control module, and the on-chip soft core CPU module is electrically connected with the on-chip soft core CPU module. The data sampling module is electrically connected with the on-chip soft core CPU module; the data sampling module is used for collecting analog quantity signals; the on-chip soft core CPU module is used for respectively processing the analog quantity signals to obtain switching value input signals; the FPGA module is used for performing parallel logic operation according to the switching value input signal to generate a switching control signal; the switch control module is used for operating according to the switch control signal to complete protection control; the technical problems that a protection control circuit in the prior art limits the quickness of a device, the technical cost is high, and a hardware circuit is complex are solved.