31results about How to "Quickly isolate faults" patented technology

The invention discloses a bus protection algorithm for realizing GIS accurate fault removing and automatic power supply recovery. The bus protection algorithm comprises the steps that bus wide-range differential current, bus small-range differential current and interval differential current are calculated respectively; faults outside a bus area and faults inside the bus area are distinguished according to actuation of a high-difference-ratio element; when the high-difference-ratio element actuates, the segment of bus on which the faults occur is determined by actuation of a low-difference-ratio element; a fault interval is determined by actuation of an interval ratio differential element; and the type of the faults is judged and the faults are responded according to the actuation situation of the high-difference-ratio element, the low-difference-ratio element and the interval ratio differential element. The beneficial effects of the bus protection algorithm are that the fault position can be accurately judged and the faults can be rapidly removed and isolated so that a situation that all connecting elements are tripped by bus protection when single interval internal faults occur can be prevented, selectivity of bus protection actuation can be guaranteed, accident scope can be reduced and system operation stability can be enhanced.

The invention belongs to the field of power distribution network control and especially relates to a distribution network star map monitoring method based on the SIM card state. The method comprises the following steps: 1) fault study and judgment based on the state of a distribution transformer; and 2) real-time monitoring of the state of the distribution transformer based on star map display. The distribution network star map monitoring method based on the SIM card state solves the problem of blind adjustment, can grasp the charged state of a power distribution network in real time and provides support for safety production and operation maintenance.

The invention discloses a relay protection method for protecting a transformer from being damaged by the flashover of a circuit breaker. The method protects all adjacent circuit breakers of a circuitbreaker with flashover, and the circuit breaker failure protection is not started. The protection method is suitable for the protection of a grid-connected circuit breaker at a high-voltage side of atransformer of a generator-transformer bank without a machine-end circuit breaker, and the delay of the protection action is 100ms, so that all adjacent circuit breakers of the circuit breaker with the flashover can be tripped off within 250ms. An existing protection method is usually longer in time delay from the starting of circuit breaker flashover protection to an outlet of failure protection,which usually causes the damage to a transformer. The method integrates the circuit breaker protection and the transformer protection, so after the flashover of the circuit breaker, all adjacent circuit breakers are directly tripped off, thereby achieving the isolation of a fault within 250ms, avoiding the expansion of the fault range, and guaranteeing that the transformer is not damaged. The method is supported by the theory and test of the national standard: the fifth part of a GB1094.5-2008 power transformer: the capability for bearing the short circuit fault, and has a great application value.

The invention discloses an island detection method and device for an electrical power device. The method includes the steps that the actual working frequency f0 of a power distribution system is obtained, and a corresponding power frequency period T is calculated according to the formula T=1 / f0; then the sampling frequency fc of the point of common coupling (PCC) of the power distribution system and a distributed power supply or a microgrid is obtained; according to the sampling frequency fc, the power frequency period T is divided into N time periods, and the formula N= fc / f0 is met, wherein the formula delta t =T / N=1 / fc is met; corresponding voltage sampling data u(n delta t) (n=0,1,2...,N) of the PCC in each time period n delta t (n=0,1,2...,N) are collected; integral operation is performed on the voltage sampling data to obtain integral values L, and the formula of L is expressed in the specification; L is compared with the threshold value beta of the island phenomenon, and if L is larger than beta, it is proved that the island phenomenon happens. The detection method is not affected by conventional interference factors in the detection process, and the integration of the whole power frequency period starting from any time can serve as a judgment criterion; only one power frequency period is needed for obtaining a judgment result, the detection speed is high, and the island detection method and device are beneficial for rapidly isolating faults and guaranteeing operation reliability of the power distribution system.

The invention discloses a control platform architecture design method, storage medium and equipment of a dynamic association context, constructs a control platform architecture based on a dynamic association context; simplifies the dynamic association context control platform architecture; and uses software programming to define a specific hardware architecture; Set the task-defined hardware architecture preset model through software, preload four typical correlation context models in the task-defined hardware architecture preset model, and control the platform architecture by sensing the task type and dynamically optimizing through the middleware programming model to configure the network Parameters, determine the matching model with the current task; determine the task definition hardware architecture preset model, when a failure occurs during use, the task will migrate to another optical communication matrix switch through the optical communication matrix switch, and continue to perform the control task without interruption. The invention breaks the traditional fixed embedded architecture, and the hardware architecture flexibly adapts to various applications through software definition.

The invention discloses a switching control system for an arc suppression coil parallel connection low resistance grounding device, comprising: a neutral point zero-sequence voltage monitoring and analysis module, a voltage transformer, a grounding transformer, an arc suppression coil, a low resistance grounding resistor, Resistor switching switch and damping resistance control module; grounding transformer neutral point is connected with voltage transformer, arc suppressing coil, resistor switching switch; neutral point zero-sequence voltage monitoring and analysis module is connected with voltage transformer and damping resistance The control module and resistor switching switch are connected to monitor the neutral point voltage amplitude of the grounding transformer, and analyze the fault conditions of the grounding transformer and outgoing lines according to the neutral point voltage amplitude to control the resistor switching switch and damping resistance control module work. The invention also discloses a switch-on / off control method of an arc-suppression coil parallel-connected low-resistance grounding device, which greatly improves the safety and reliability of the power supply of the distribution network, and has the characteristics of simplicity, reliability and high feasibility.

The invention provides a transformer substation exception handling simulation system based on an network online system of a VR local area. and the system is characterized in that the system comprisesa substation modeling module, a virtual role modeling module, a visual platform operation module, an equipment action manufacturing module, a virtual substation module operation module and an action evaluation module; the transformer substation modeling module is used for modeling a virtual transformer substation; the virtual role modeling module is used for modeling a virtual role in the virtualtransformer substation; the visual platform operation module is used for customizing a virtual scene for a virtual substation user; and the equipment action making module is used for establishing an equipment action process library based on the script animation. The virtual reality technology is utilized to optimize the power supply enterprise training work, the internal structure and the action process in the equipment operation process can be displayed, students can simulate operation, the teaching quality is improved, and the training cost is reduced.

The invention discloses a method for judging disappearance of a secondary direct-current power supply of a far-end transformer substation. A power loss alarm contact of the secondary direct-current power supply of the transformer substation is introduced into I / O on-off input of a communication cell measuring and controlling device. The communication bandwidth of MSTP equipment is divided into the protection bandwidth and measuring and controlling bandwidth which are independent from each other, the protection bandwidth is used for conveying protection information, and the measuring and controlling bandwidth is used for conveying access power loss on-off input information of measuring and controlling equipment. A receiving end transformer substation protection device can detect received offside information in real time. The judgment whether a secondary direct-current power supply of an offside transformer substation disappears can be given out in real time by comparing information of the protection bandwidth with information of the measuring and controlling bandwidth. According to the method, a measuring and controlling loop of an independent power supply and a communication loop of independent bandwidth can be utilized to transmit disappearance information of the secondary direct-current power supply. Disappearance of the secondary direct-current power supply of the far-end transformer substation can be accurately recognized in an online mode by comparing the protection bandwidth with the measuring and controlling bandwidth. Thus, decision basis can be provided for following protection strategies or control strategies.

The invention relates to a DC fault isolation method based on an isolated modular DC transformer. The adopted isolated modular DC transformer is based on an improved half-bridge sub-module: a set of anti-parallel structures composed of IGBT VT1 and diode VD1 and a sub-module The module capacitor C is connected in series and connected in parallel with the anti-parallel structure composed of reverse resistance IGBT VT2 and thyristor T2. The emitter of VT1 is connected to the collector of VT2, and the collector and emitter of VT2 are respectively connected to the input and output of the sub-module. , Reverse resistance IGBT VT2 adopts IGBT with reverse resistance function, namely RB-IGBT, or adopts IGBT and diode in series in the same direction; when a fault occurs in the DC line, once a fault is detected, it will be turned off by sending a shutdown command to the sub-module. All IGBTs, and cancel the turn-on signal of the thyristor, and at the same time change the voltage modulation mode of the inverter on the sound side, so that the bridge arm current in the inverter on the fault side crosses zero in turn to realize the shutdown of the bridge arm, and complete the fault clearance and isolation. .

The invention discloses a failure protection method for a DC circuit breaker. The method comprises the following steps of carrying out DC line protection action, sending out a DC circuit breaker tripping signal and simultaneously starting circuit breaker failure protection; delaying deltaT1, collecting DC bus voltage Ub and line side voltage U1 and calculating a mean value Ek of difference valuesbetween the DC bus voltage Ub and the line side voltage U1 within deltaT2; judging whether the condition that Ek is greater than Eset is met or not; if so, judging that the circuit breaker is successfully disconnected and returning protection; and if not, judging that the circuit breaker is not successfully disconnected, carrying out circuit breaker failure protection action, sending out a tripping signal to the other circuit breakers connected with a bus and sending out a blocking signal to a local converter. According to the method disclosed by the invention, whether the circuit breaker successfully acts or not can be reliably distinguished only through the bus voltage and the line side voltage of the DC circuit breaker without adopting internal information of the DC circuit breaker.

Techniques are provided for improved fault isolation and fault reduction. A system for use with a data network includes multiple diagnostic units each adapted to communicate with the network including to a network user. A central controller is operatively connected to the diagnostic units, the controller being adapted to communicate with and coordinate operations of the diagnostic units, to instruct the diagnostic units to perform tests adapted to help isolate a network fault, and to analyze test results received from a diagnostic unit to attempt to determine the network fault. Various methods for improving fault isolation and fault reduction are also provided.

The invention discloses a blocking reverse turn-on method based on voltage abrupt change amount and three-sequence component asymmetry. In voltage-time-type feeder automation, the downstream automation switch of a fault point is blocked and turned on reversely according to the sequence component asymmetry, and an interconnection automatic switch blocks the interconnection transfer according to thesudden change amount of the voltage positive sequence component. The method adapts to asymmetric faults and symmetrical faults, provides a new reverse locking turn-on strategy, and improves the reverse locking turn-on sensitivity, thereby improving the accuracy of positioning and isolation of the local feeder automation fault section.

The invention provides a distributed type component differential protection method and a distributed type component differential protection system. The distributed type component differential protection method comprises the following steps: judging whether other protection sub-machines except for one of the protection sub-machines act or not; if one of the protection sub-machines starts failure judgment, determining the protection judgment logic of one of the protection sub-machines according to the condition whether other protection sub-machines except for one of the protection sub-machines act or not; and if other protection sub-machines act, simplifying the action criterion of one of the protectin sub-machines, guaranteeing the protection sub-machine rapidly perform tripping outlet, guaranteeing that each protection sub-machine is far away from the failure point at the highest speed and avoids adverse influence caused by action behavior on the adjacent protection device or the safeautomatic device. The problem that the interval tripping time of the distributed type mounting and non-master configuration span-spacing component protection is inconsistent under the complex failurecondition in the area is solved, consistent step of the action behavior of each protection sub-machine under any failure is guaranteed, the failure can be isolated rapidly, and the power supply reliability is improved.

The invention provides a multi-satellite separation and release power supply controller, the power supply controller includes an interface module, a control module, and a battery module; To the control module, as the power supply of the control module; under the control of the externally input travel switch branch control signal, the travel switch is closed or disconnected, and the travel switch control command signal is provided to the control module; the control module uses three independent channels to collect The travel switch control command signal, and then, according to the preset timing of different satellite branches, according to the principle of 2 out of 3, output the satellite separation and release control signal according to the collected three-way travel switch control command signal, and control the satellite separation on the corresponding satellite branch. release; the battery module outputs a power signal to the interface module. The invention ensures high reliability and high safety of satellite separation and release.

The invention discloses a busbar differential protection optimization method and a busbar differential protection system for an intelligent transformer substation. The method comprises the steps of grouping merging units, arranging two network ports capable of transmitting sampling value data frames with different priorities on each merging unit according to a group of the merging unit, and connecting with two networks, and allowing busbar differential protection equipment to select the sampling value data frame with the high priority for busbar differential protection calculation when receiving the sampling value data frames with the same data content. The device comprises a busbar differential protection device and two merging unit groups, wherein each merging unit group is connected with the two networks respectively via the two network ports capable of transmitting the sampling value data frames with the different priorities, and further, the sampling value data frames with different priorities can be transmitted to the busbar differential protection device, so that the busbar differential protection equipment operates quickly. The method and the system can effectively improve the performance of a communication network of a process level, particularly has the characteristic of quick operation of busbar differential protection, and is high in efficiency and low in implementation cost.