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

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.

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 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.