51results about How to "Solve misoperation" patented technology

The invention discloses a power frequency variation direction protection improvement method suitable for UPFC access and belongs to the technical field of UPFC-containing line protection. A relay protection device is arranged at a head end of a line where a UPFC is located, a current transformer (TA) is connected to the head end of the line, voltage transformers (PT) are connected to a P measuringpoint at the head end of the line and an L measuring point at an outlet in a right side of a UPFC series transformer, and positive sequence break variable impedance phase angles of the two measuringpoints during a fault are obtained respectively. Positive direction action area membership functions lambda 1 and lambda 2 and negative direction action area membership functions lambda 3 and lambda 4respectively corresponding to the positive sequence break variable impedance phase angles of the P measuring point and the L measuring point are calculated, a comprehensive membership function mu issolved, and a power frequency variable quantity direction element can correctly judge forward and reverse faults by judging the size relationship between mu and a threshold eta. The method is simple and easy to implement and low in investment, and the problem of misoperation of the power frequency variable quantity direction element caused by the existence of the UPFC in power frequency variable quantity direction protection can be effectively solved.

The invention relates to an on-line optical detection and sensing device for the position of an electric secondary pressure plate in a substation, which includes a protective cover and a positioning plate installed in the protective cover. The light column and the exit positioning light guide column, the input positioning light guide column and the exit positioning light guide column are respectively embedded with optical fibers of the same size, and the edge of the protective cover is provided with an optical input optical fiber, an input optical output optical fiber and an exit optical output optical fiber, The two ends of the input positioning light guide column can be connected to the ends of the light input optical fiber and the input light output optical fiber respectively by rotating the positioning disc, and the two ends of the withdrawal positioning light guide column can be respectively connected to the ends of the optical input optical fiber by rotating the positioning disc. The light input fiber and the end of the light output fiber are connected. The invention improves the safety and reliability of the operation of the substation and the level of intelligent detection, effectively prevents the switching and misoperation of the inspection personnel, and reduces the operation and maintenance cost of the inspection.

The invention discloses a prefabricated cabin type high-voltage reactive compensation device and a reactive supplementation method. A prefabricated cabin is provided with a ventilation device, a lighting device, an air-conditioner, an image monitoring device and a fire warning and firefighting device, wherein a distribution cabinet is internally provided with a standard high-voltage primary interface and a power source interface, and supplies power to the prefabricated cabin; a wire concentration cabinet is connected to the distribution cabinet, the ventilation device, the lighting device, the air-conditioner, the image monitoring device and the fire warning and firefighting device to improve the safety of the reactive compensation device and solve the problem of safety hazard as the incoming wires of the primary circuit of the existing box type high-voltage reactive compensation device are fussy; the wire concentration cabinet is internally provided with a standard secondary interface and an optical interface, and realizes communication with a station control layer by acquiring analogue signal amount inside the distribution cabinet and converting the analogue signal amount into an optical signal and an optical signal, so that the problems of fussy interfaces of the secondary circuit interface and existence of signal attenuation due to the adoption of the analogue signal long-distance transmission are solved; a console is arranged, so that a man-machine interaction function is achieved, the existing state of the device is known comprehensively, and convenience is brought to daily control and maintenance.

The invention relates to a method for realizing the emergency control on the frequency and the voltage of an electric system. On the basis of a bus voltage V, a frequency f, a generator or a load current I of an installing place of a frequency and voltage emergency controller, the emergency state, the measuring loop abnormal state and the load feedback state of the frequency and the voltage of the electric system can be automatically recognized, and the execution of the emergency control action can be correspondingly unlocked or locked. The method introduces the current amount measurement in a traditional controller, and a key problem that the device measuring abnormity and the electric network emergency state can not be correctly distinguished only through the variation rate of the frequency or the voltage can be solved.

The invention provides a method for eliminating small gap discharge, which relates to the field of electricity consumption. A method for eliminating small-gap discharge, comprising a casing, a plasma jet generating device, and a first discharge part and a second discharge part oppositely arranged in the casing, and between the first discharge part and the second discharge part A discharge gap is provided, the plasma jet generating device acts on the discharge gap, and is adjustably connected to the casing along the space between the first discharge member and the second discharge member, and one end of the first discharge member protrudes from the above-mentioned The outside of the casing is used for connecting to the transformer, and the above-mentioned second discharge member extends out of the above-mentioned casing and is used for grounding. The method can solve the problem of large dispersion caused when the insulating medium is air, which leads to malfunction of the protection device and damage to the transformer, and reduces electrical damage caused by the malfunction of the protection device.