43results about How to "Protection action fast" patented technology

The invention provides an intelligent substation centralized relay protection system which comprises a centralized relay protection management platform, a local protection device, a moving device, a monitoring device and a fault recording device. The centralized relay protection management platform, the plurality of local protection devices, the monitoring device and the fault recording device conduct communication through MMS, GOOSE and SV in a dual-network dual-sleeve mode, the monitoring device is used for detecting and controlling the network state, the centralized relay protection management platform has a substation bus fault analysis and protection control function and further has functions of line fault backup protection, line protection, failure protection and substation relay protection platform management. An intelligent substation centralized replay protection method is further provided. The system and method has the advantages of being capable of effectively utilizing secondary system total station information, flexible in protection control means and quick in backup protection action.

The invention discloses a power grid islanding detection and anti-islanding protection method for a large-scale wind power generation system. The method includes the following steps that: a node type list and a node connection list are initialized; circuit breaker tripping signals in a power grid are monitored, and the node connection list is updated according to the monitored circuit breaker tripping signals, nodes corresponding to the circuit breaker tripping signals are pushed into a queue; and logical judgment is carried out according to the updated node connection list and the queue, so that whether the nodes corresponding to the circuit breaker tripping signals are islanded can be judged. The method is used for the large-scale wind power generation system and carries out islanding detection and anti-islanding protection at a high-voltage main grid of a power source side. The power grid islanding detection and anti-islanding protection method is advantageous in being fast, accurate, efficient, safe and stable. According to the power grid islanding detection and anti-islanding protection method provided by the technical scheme of the invention, line weight does not require to be considered, and therefore, anti-islanding protection actions can be performed more rapidly.

The invention discloses a layered domain-partitioned anti-islanding protection method for large-scale wind power generation. The method includes the steps of: monitoring all breaker tripping signals in a wind power generation system; judging when cluster main station outgoing tie lines and a main transformer are all disconnected according to the breaker tripping signal of the cluster main station, and protecting an island formed due to disconnection of all the cluster main station outgoing tie lines and the main transformer; judging whether an island is formed due to a wind power plant collection bus fault according to the breaker tripping signal of the wind power plant collection bus, and protecting the island formed by the wind power plant collection bus fault; and judging whether an island is formed due to a wind power plant current collection feeder line fault according to the breaker tripping signal of a blower fan feeder line, and protecting the island formed by the wind power plant current collection feeder line fault. The layered domain-partitioned anti-islanding protection method for large-scale wind power generation realizes the advantages of being rapid, accurate, efficient, safe and stable.

The invention discloses a dust explosion-proof monitoring alarm device applied to a dust remover, which comprises a dust remover body, a main control module, a dust removal cloth bag monitoring modulearranged on the dust remover body and connected with the main control module, a working temperature monitoring module, an air bag blowing monitoring module, an ash conveying motor monitoring module,an ash discharging motor monitoring module and an alarm module, wherein the main control module is connected with a display module and a transmission module through a PPI bus. According to the invention, all-round real-time monitoring is carried out on operation data such as air inlet and outlet pressure difference, box body temperature, air bag injection pressure, ash conveying rotation frequency, ash discharging rotation frequency and the like of the dust remover, and when an abnormal situation occurs in the dust remover, the main control module controls the alarm to send out sound and lightalarms and take protective actions, thereby effectively preventing dust explosion in the dust remover from generating danger and having high safety coefficient.

The invention discloses a flexible direct-current distribution network fault positioning and isolating method which belongs to the technical field of automatic relay protection of power systems. The method is a full-bridge submodule based modular multilevel converter (FBMMC) flexible direct-current distribution network fault positioning and isolating method based on a current zero-crossing detection principle. According to the method, the rapid and accurate positioning of a bipolar short-circuit fault of the flexible direct-current power distribution network is realized by utilizing the characteristic that protection measured currents at two ends of a fault line do not cross zero at the same time, cross zero at the same time or do not cross zero. The rapid isolation of the fault line is realized by a mechanical switch marked that currents at two ends of the line do not cross zero at the same time, a fault area is judged through communication at two ends of the line, a fault current limiter does not need to serve as a protection boundary, the reliability is high, the overall length of the line can be protected, the protection principle is simple, a judgment condition is easy to realize, the protection action is rapid, and the full-bridge sub-module is used for the self-clearing of fault current, and so the clearing and isolation of the bipolar short-circuit fault are realized.

The invention discloses a layered and domain-partitioned island protection method with a non-fault-trip preventing function aiming at a large-scale wind power plant. The layered and domain-partitioned island protection method comprises the steps of: starting a non-fault-trip prevention real-time detection module, detecting all circuit breakers in a wind power generation system in real time; monitoring tripping signals of all the circuit breakers arranged in the wind power generation system; judging whether cluster main station sending-out tie lines and main transformers are all cut off through tripping signals of circuit breakers of a cluster main station, and protecting a formed island; judging whether an island is formed due to booster station transformer faults through tripping signals of booster station transformer circuit breakers, and protecting the formed island; judging whether an island is formed due to wind power plant collection bus faults through tripping signals of wind power plant collection bus circuit breakers, and protecting the formed island; and judging whether an island is formed due to wind power plant current collection feeder faults through tripping signals of fan feeder circuit breakers, and protecting the island formed due to the wind power plant current collection feeder faults. The layered and domain-partitioned island protection method achieves the advantages of being fast, accurate, efficient, safe and stable.

The invention belongs to the technical field of power equipment, and particularly relates to a novel active protection device in a DC system. The circuit comprises a double-tube forward DC/DC converter, a single-chip microcomputer control circuit, an output diode and a detection circuit. The input end of the double-tube forward DC/DC converter is connected with the storage battery pack, and the output end of the double-tube forward DC/DC converter is connected with the direct-current load through the output diode; the single-chip microcomputer control circuit is connected with the driving endof the double-tube forward DC/DC converter and further connected with a transmission interface of the detection circuit, and a sampling port of the detection circuit is connected with an output diodeat the output end of the DC/DC converter. The single-chip microcomputer control circuit is also connected with a communication interface and a man-machine interaction interface. According to the invention, the functions of active isolation, active fault detection, active fault positioning and equipment protection of the AC-DC channeling line fault can be realized.

The invention belongs to the technical field of yarn dyeing devices and in particular relates to an infrared setting, color fixing and yarn winding machine. The infrared setting, color fixing and yarn winding machine comprises a rack, wherein a pair of winding heads is arranged in the rack up and down; an infrared drying device is mounted on the rear side of the rack between the upper winding head and the lower winding head which correspond to each other; the infrared drying device comprises a heat preservation shell body; the front side of the shell body is opened and provided with a safety net; a pair of infrared radiation tubes is arranged in the shell body up and down; a reflection layer is attached on the inner wall of the back of the shell body; the infrared radiation tubes are mounted in the shell body through a plurality of transversely arranged support plates. The infrared setting, color fixing and yarn winding machine is reasonable in structure, is capable of further setting and fixing color of the dyed yarns in the yarn winding process, improving the coloring quality of the yarns, avoiding the personal safety accident, ensuring the normal working of equipment and improving the working efficiency, and is relatively suitable for popularization and implementation.

The invention relates to the technical field of belt breakage signal detection, and discloses a belt breakage protector safety control device. The device comprises a single chip microcomputer, detection devices, brake mechanisms, a temperature sensor, an open flame sensor, and a plurality of sprinkling devices, wherein the detection devices are connected with the SCM, mounted on the lower surface of a belt, and used for collecting belt sliding signals; the brake mechanisms are connected with the SCM and used for stopping the belt; the temperature sensor is connected with the SCM, mounted on a belt runner, and used for collecting the temperature information of the runner; the open flame sensor is connected with the SCM, mounted above the upper belt, and used for detecting the open flame information of the belt; the sprinkling devices are connected with the SCM and uniformly mounted above the upper belt. The belt breakage protector safety control device has the advantages that timely and reliable judgment is carried out in case of belt breakage of a belt breakage protector device, so that a conveyor device and personal safety can be effectively protected; meanwhile, the belt breakage protector safety control device achieves the functions of temperature protection and open flame protection.

The invention discloses a current transformer protection device with a remote short message alarming function, which comprises a protection execution circuit, a comparison trigger circuit, a protection signal control circuit, a photoelectric isolation circuit, a power supply circuit, a singlechip microcomputer circuit, a short message alarming circuit and a voice alarming module, wherein the protection execution circuit arranged on a current transformer is connected to the comparison trigger circuit and the protection signal control circuit, the comparison trigger circuit is connected to the protection signal control circuit, the comparison trigger circuit is connected to the singlechip microcomputer circuit through the photoelectric isolation circuit, and the singlechip microcomputer circuit is connected to the short message alarming circuit and the voice alarming module; and the power supply circuit is connected to the comparison trigger circuit, the protection signal control circuit, the singlechip microcomputer circuit, the short message alarming circuit and the voice alarming module. The current transformer protection device can carry out short-circuit protection when a circumstance of overcurrent or overvoltage occurs in the current transformer, gives out a voice alarm at the same time, and sends a short message to notify the staff to maintain.

The invention discloses a protection device and a protection method for suppressing short circuit of a DC bus support capacitor. The protection device comprises a bidirectional solid-state circuit breaker, and the bidirectional solid-state circuit breaker is arranged in a branch of the DC bus capacitor bank; the bidirectional solid-state circuit breaker is connected in series with a capacitor bankin a VSC; the bidirectional solid-state circuit breaker comprises a bidirectional switch, a current-limiting resistor R and a controller, wherein the bidirectional switch is formed by connecting a set of forward solid-state switches and a set of reverse solid-state switches in series, the current-limiting resistor R is connected to the two sides of the forward solid-state switches in parallel, and each of the set of forward solid-state switches and the set of reverse solid-state switches is composed of IGBT anti-parallel power diodes. The protection device can meet the requirement of quicklycutting off fault current, reduces the current stress and design requirements of a main loop, can achieve arc-free breaking, is simple and reliable, is low in cost, is easy to operate, and is completein function.