33results about How to "Quickly remove faults" patented technology

The invention discloses a three terminal line fiber differential synchronized phasor algorithm based on a sampling circle. Every two in the three terminal line are communicated by fiber channels, each device can receive alternating quantity sent by other two opposite terminals through respective fiber channels and the data packet of each opposite terminal is resolved in each device; the data pockets are calculated by the three terminal line fiber differential synchronized phasor algorithm based on a sampling circle to find out three terminal alternating current quantity at the same time one time then the alternating current quantity of the same time is used for judging whether the AC transmission line has fault inside the sample space or not.

The invention relates to the technical field of relay protection, and discloses relay protection configuration integrated equipment for a power-plant electric auxiliary system. The equipment comprises a high-voltage plant transformer relay protection device which is disposed at a high-voltage side and / or low-voltage side of a high-voltage plant transformer of the power-plant electric auxiliary system; and a low-voltage plant transformer relay protection device which is disposed at a high-voltage side or low-voltage side of a low-voltage plant transformer of the power-plant electric auxiliary system. The high-voltage plant transformer relay protection device comprises a high-voltage branch time-limiting quick-break protection apparatus which is disposed on a low-voltage side branch of the high-voltage plant transformer and used for the main protection of a bus segment corresponding to the low-voltage side of the high-voltage plant transformer. When the value of a current flowing through the high-voltage branch time-limiting quick-break protection apparatus is not less than an action current, a fault on a low-voltage side bus of the high-voltage plant transformer is eliminated. The equipment provided by the invention can quickly eliminate the fault at a corresponding position of the power-plant electric auxiliary system.

The invention relates to a transformer differential protection method based on a variable window length integral of sudden change sampling values. A current sample value of each side is obtained through a current transformer of each side of a transformer, the reduction of the currents on other sides of the transformer are conducted on the high voltage side, a differential current sample value anda differential current sudden change amount are obtained through calculation, and the differential current sudden change amount is used to judge whether protection is started or not, and the differential current sudden change amount sample value integral is calculated to judge whether the differential current sudden change amount sample value integral satisfies the condition, and the confirmationcount N1 is accumulated to judge whether the accumulated N1 satisfies the condition. The method improves the action speed of the differential protection, realizes the inverse time limit characteristicof the differential protection, reduces the data cache and the resource occupation, has high operation efficiency and is easy to realize in a device.

The invention relates to the technical field of power supply and distribution monitoring, in particular to a remote monitoring method for a mine power supply and distribution system. A circuit breakerused in the method comprises a vertically-arranged mounting plate, and a vacuum arc-extinguishing device and an operation maintaining device are sequentially arranged on the front side of the mounting plate from top to bottom; the vacuum arc-extinguishing device comprises an arc-extinguishing chamber, the arc-extinguishing chamber is fixed on a mounting plate through a first fixing frame on the outer side of the arc-extinguishing chamber, a static contact is fixedly arranged on the upper portion of the arc-extinguishing chamber, and the upper end of the static contact is connected with a static conducting rod extending out of the upper end of the arc-extinguishing chamber. The upper part and the lower part of the arc- extinguishing chamber is provided with moving contacts which are rightopposite to the static contact. Through arrangement of an eddy current disc, a first coil and a second coil, rapid separation of the moving contact and the static contact is realized through an electromagnetic repulsion mode, and compared with a spring type separation mode, rapid opening of the circuit breaker is realized so that faults can be rapidly removed, occurrence of safety accidents can beprevented and use requirements of ore circuit power supply and distribution monitoring can be met.

Disclosed is an excitation loss protection method in the synchronization unit starting process. The excitation loss protection method in the synchronization unit starting process comprises the steps of measuring voltage and current of a port of a starting unit in real time; seen from the port to the interior of the unit, enabling the unit which is started to be equivalent to a model connected with a resistor and an inductor in series, wherein the voltage and current of the unit obtained through real-time measurement by a measuring device are sampling values; on the basis of the principle of least squares, calculating the sampling values, and obtaining estimated values of the equivalent resistance and the induction seen from the port of the unit; according to the calculation result of the equivalent resistance and induction obtained through calculation of the estimated values, judging whether the result value enters an action area or not; if the result value enters the action area, determining that an excitation loss fault happens on the starting unit; if not, no excitation loss fault happens on the starting unit. According to the excitation loss protection method in the synchronization unit starting process, the frequency in the starting process is not calculated, the resistance and induction change trajectories can be directly calculated under the time domain condition through the resistance and induction equivalent model, frequency estimation is avoided, and the excitation loss protection method is applicable to the occasion that the frequency of the unit continuously changes in the starting process.

The invention relates to the technical field of power grid information, in particular to an intelligent power distribution switch protection constant value setting system. The network architecture ofthe system is characterized in that: the platform of the system adopts a convenient deployment and multi-level application mode, and integrally follows the plug-and-play principle; the system serviceis deployed in an enterprise intranet server, an enterprise intranet client can directly access the system service, and an extranet PC client and a mobile terminal access the system service through aVPN private network during field work. The system has the following beneficial effects, through providing the intelligent power distribution switch protection constant value setting system, the purpose of accurately and reasonably setting the protection constant value of the setting equipment can be achieved, enables the power distribution automation terminal and the protection device to achieve the functions of quickly removing a fault, reducing the power failure range and improving the power supply reliability of a power distribution network, provides reliable power supply guarantee for theproduction and life of residents, and brings good economic and social benefits to a company.

The invention, which belongs to the field of power system transformation engineering, relates to a 10-kV bus differential protection method based on a process layer networking mode of a smart substation. Since the traditional substation 10-kV bus is not configured with bus differential protection, faults can not be cut and removed rapidly; and the 10-kV bus fault is removed by relying on the long-term backup protection like over-current protection of the low-voltage side of the main transformer, so that the safety of the primary equipment and the stability of the distribution network are affected. According to the invention, on the basis of the information sharing of intelligent substations, interlocking and starting conditions are added for the bus differential protection logic, the application of 10-kV bus differential protection is realized; the bus fault can be removed rapidly; the primary equipment is protected; and the operational reliability of the substation is improved.

The invention discloses an unbalance protection method for excitation current of a no-load switch-on unsaturated zone of a transformer. By using the method, when the degree of unbalancedness of three-phase current in the unsaturated zone is greater than a setting value Phd and a floating threshold, an exit is tripped, which shows that the interior of the transformer goes wrong. By using the unbalance protection method, the transformer cannot generate false-tripping during no-load switch-on; and simultaneously the transformer has high sensibility when being switched to a turn-to-turn short circuit without load, and faults can be quickly removed when the transformer is switched to the turn-to-turn fault, an inter-phase short circuit and a grounded short circuit without load so that the transformer is not influenced by excitation surge current.

The invention discloses a software protection method for an intelligent IED control switch cabinet. The intelligent IED control switch cabinet comprises an MCU, a human-machine interface, a control execution unit, a display unit, a communication unit and a switching circuit which are integrated on a shell of the same device, wherein an acquisition unit is connected to the MCU through the switching circuit capable of converting an acquisition signal to be recognized by the MCU; the MCU is also respectively electrically connected to the human-machine interface and the communication unit; and the human-machine interface is respectively electrically connected to the control execution unit and the display unit. The method has a prefect comprehensive protection function, meets operation requirements of different projects, integrates switch cabinet state on-line monitoring, control, protection and communication and avoids the problems of repeated signal acquisition, complicated wiring and the like.

The invention discloses a circuit breaker dead zone protection method, which relates to the field of power system relay protection, and comprises the following steps: setting a dead zone over-current protection constant value and time limit of a protection device BH-DL, and comparing the current of a current transformer corresponding to a circuit breaker with the dead zone over-current protection constant value when the circuit breaker is judged to be in an open position; when the current exceeds a dead-zone overcurrent protection constant value and meets a dead-zone overcurrent protection time limit, judging that a dead zone has a fault, and instantaneously cutting off an incoming circuit breaker on the power supply side of the dead zone; compared with an existing dead-zone protection method, the method has the advantages that the method does not need to add primary equipment such as an electronic transformer, does not depend on triggering of conventional current protection (quick-break protection, overcurrent protection and zero-sequence protection), does not need to collect bus voltage, adopts an existing protection device, and can quickly cut off the fault when the circuit breaker has the dead-zone fault.

Disclosed is an excitation loss protection method in the synchronization unit starting process. The excitation loss protection method in the synchronization unit starting process comprises the steps of measuring voltage and current of a port of a starting unit in real time; seen from the port to the interior of the unit, enabling the unit which is started to be equivalent to a model connected with a resistor and an inductor in series, wherein the voltage and current of the unit obtained through real-time measurement by a measuring device are sampling values; on the basis of the principle of least squares, calculating the sampling values, and obtaining estimated values of the equivalent resistance and the induction seen from the port of the unit; according to the calculation result of the equivalent resistance and induction obtained through calculation of the estimated values, judging whether the result value enters an action area or not; if the result value enters the action area, determining that an excitation loss fault happens on the starting unit; if not, no excitation loss fault happens on the starting unit. According to the excitation loss protection method in the synchronization unit starting process, the frequency in the starting process is not calculated, the resistance and induction change trajectories can be directly calculated under the time domain condition through the resistance and induction equivalent model, frequency estimation is avoided, and the excitation loss protection method is applicable to the occasion that the frequency of the unit continuously changes in the starting process.

The invention discloses a medium-low voltage bus electrical arc light protection method and system. The system comprises a main control unit, wherein the input end of the main control unit is connected with at least one auxiliary unit; the output end of the main control unit is connected with at least one circuit breaker; each auxiliary unit is respectively connected with an arc light unit, a current unit and a current unit; the arc light unit is connected with an arc light sensor; the current unit is connected with a current sensor; and the current unit is connected with a temperature sensor. The light sensitive range sensitivity can be regulated between the arc light unit and the main control unit, the sensitivity is influenced by the arc light sensor and the length of an optical fiber, and the sensitivity can be regulated within the range of 10-50KLUX. The electrical arc light protection can rapidly remove the medium-low voltage bus stoppage, and the safety operation of a transmission and distribution power grid is ensured.

The invention discloses an equipment state sensing type 110kV line protection system and an implementation method. The equipment state sensing type 110kV line protection system comprises a relay protection function module, a circuit breaker online monitoring module, a comprehensive analysis function module and a double-power supply switching module; and the relay protection function module is separately connected with a merging unit, an intelligent terminal and a process layer switch via optical cables to form a relay protection device secondary loop. The equipment state sensing type 110kV line protection system constructs an active defense type 110kV line security protection system so as to integrate equipment state sensing, accident pre-warning and relay protection of the 110kV line, which not only reduces the faults of the relay, but also quickly removes the faults, reduces the investment and operation and maintenance costs of intelligent substation equipment and protects the robustness of the grid in real time, and if the relay protection device can increase the active defense alarm function of the equipment state sensing, the principles of relay protection can be optimized, the occurrence of faults is reduced, the faults are quickly removed, and the investment and operation and maintenance costs of intelligent substation equipment can be reduced.

The invention relates to a transformer differential protection method based on the variable window length integral of the sudden change sampling value. The current sampling value of each side is obtained through the current transformer on each side of the transformer, and the current of other sides of the transformer is attributed to the high voltage side, and the calculation is obtained. Differential current sampling value, differential current sudden change, use the differential current sudden change to judge whether the protection is started, calculate the differential current sudden change sampling value integration, judge whether the differential current sudden change sampling value integration meets the conditions, and carry out confirmation counting N 1 Accumulate, judge the accumulated N 1 Whether the conditions are met. The invention improves the operation speed of the differential protection, realizes the inverse time limit characteristic of the differential protection, reduces data cache and resource occupation, has high computing efficiency, and is easy to implement in the device.

The present invention relates to the technical field of relay protection, and discloses a complete set of device for relay protection configuration of the power system of a power plant. The high-voltage side and / or low-voltage side of the high-voltage factory-use transformer of the power system; and the relay protection device of the low-voltage factory-use transformer, which is set on the high-voltage side or low-voltage side of the low-voltage factory-use transformer of the power plant power system; the high-voltage factory-use transformer The transformer relay protection device includes: a high-voltage branch time-limited quick-break protection device, which is installed on the branch of the low-voltage side of the high-voltage plant transformer, and is used as the main protection for the corresponding section of the busbar on the low-voltage side of the high-voltage plant transformer. When the current value of the quick-break protection device is greater than or equal to the operating current, the fault on the low-voltage side busbar of the high-voltage industrial transformer is removed. The complete relay protection configuration device of the present invention can quickly remove faults at corresponding positions in the electricity system of a power plant.

The invention relates to the technical field of power distribution networks, and, more specifically, relates to a distributed intelligent self-recovery system and method. The system comprises a topological line, a regional power distribution terminal and a plurality of unit type power distribution terminals communicating with the regional power distribution terminal. The unit type power distribution terminals perform information collection and fault detection of adjacent switches, and upload the information at a GOOSE information format to the regional power distribution terminal, and receivecontrol commands sent by the regional power distribution terminal. The GOOSE information interaction is carried out between the regional power distribution terminal and all unit type power distribution terminals. The regional power distribution terminal uploads a processing result to a power distribution main station. The unit type power distribution terminals and the regional type power distribution terminals are connected with a topological line. According to the invention, the system can achieve the rapid fault isolation, power supply recovery of a non-fault area and decentralized control processing, achieves the full-distributed distribution network self-recovery, does not need the participation of a distribution main station in the self-recovery process, reduces the fault power failure time, and improves the power supply reliability of the distribution network.

The invention discloses a station area protection method for the lack of measurement information, including that if the measurement information on the connection line between the transformer and the bus in the substation to be tested is missing, the outgoing current of the transformer and the bus is used to form a large difference protection, and if the current differential current satisfies the The preset criterion calculates the time difference between the fault occurrence time and the differential current; if the time difference is not greater than the first preset threshold, it is judged whether the current differential current meets the transformer excitation inrush current criterion; if not, a trip command is sent to the transformer and the bus Connect the circuit breaker on the line; judge whether the auxiliary contact of the circuit breaker is disconnected; if so, use the bus outlet current to form a bus differential protection, and send a trip command to the bus outlet when the bus differential current meets the preset criteria; if not, And when the detection time does not reach the second preset threshold, it returns to judge whether the auxiliary contact of the circuit breaker is disconnected. The present invention can quickly and accurately remove the fault when the information is missing, and has the advantages of low cost and easy implementation.

The invention relates to a device and method for quickly identifying the fault location of a distribution network line. The device includes a detection device and an optical fiber network for connecting adjacent detection devices. The method includes step 1, the detection device detects the current flowing through its corresponding circuit breaker and obtains an instant current value; Step 2, the detection device compares the instant current value with the current value. The preset fault current values ​​are compared; step 3, the detection device sets the fault flag, generates a detection signal at the same time, and transmits it to the adjacent detection device through the optical fiber network; step 4, receives the signal sent by the adjacent detection device through the optical fiber network detection signal; step 5, the detection device judges whether the fault location of the distribution network line is in the power supply interval where the detection device is located according to the detection signal it generates and the detection signal it receives; step 6, if the fault location is in the location where the detection device is located In the power supply section, the detection device controls its corresponding circuit breaker to trip. It is used to quickly troubleshoot faults and ensure circuit stability.

The invention provides a power transmission line backup protection method based on wide area information, which comprises the following steps that: current and bus voltage at the two ends of a power transmission line are acquired; differential current, bus differential current IX and wide area differential current at the two ends of the power transmission line are calculated; if a current differential protection device acts, circuit breakers at the two ends of the power transmission line are disconnected; if the current differential protection device refuses to act, the next step is executed; if both the wide area differential criterion and the bus differential criterion are satisfied, all circuit breakers on a bus are disconnected; if the wide area differential criterion is satisfied, and the bus differential criterion is not satisfied, the directions of directional elements at the two ends of the power transmission line are judged, and if the directions of the directional elements at the two ends of the power transmission line are positive, the circuit breakers at the two ends of the power transmission line are disconnected; and or else, the differential current, the IX and the IY at the two ends of the power transmission line are calculated. The invention has the beneficial effects that the power transmission line backup protection method can be taken as a back-up protection device of a main protection device of the line, and faulty lines can be quickly and accurately identified when the current differential protection device refuses to act.