51results about How to "Solve misoperation" patented technology

The invention discloses a zero-sequence voltage trip protection method for the low-voltage side of transformers. For the fact that the primary neutral-point earthing of the low-voltage side of a transformer is an unearthed system, the method protects earthing of the low-voltage side of the transformer by configuring one or double voltage transformers on the low-voltage side of the transformer and setting zero-sequence overvoltage trip protection logic, protection input and protection output. Corresponding voltage loop breakage locking logics of the voltage transformers are selected for trip protection by means of changing control words according to configuration and wiring manners of the voltage transformers. The method effectively solves the problem of transformer low-voltage side zero-sequence voltage protection malfunction caused by primary-side and secondary-side voltage loop breakage of the voltage transformers on the low-voltage side of the transformer, and ensures accurate and reliable action of the transformer in case of single-phase earthing fault of the primary loop on the low-voltage side of the transformer.

The invention discloses a grounding fault start method based on power grid characteristic parameter continuous increment, and the method comprises the steps: detecting the displacement voltage U<N> of a neutral point in a distribution network and the zero sequence current I<0N> of each feed line in real time; determining that a power grid has a single-phase grounding fault if, in a time period delta T, the stable increment of the voltage of the neutral point in the distribution network accords with a formula: delta U<N> >= delta U<NL>, and the stable value of the zero sequence current of any one feed line accords with a formula: I<0N> >= I<0E>, and enabling a grounding fault processing device to carry out the fault start at this moment, and to process the single-phase grounding fault; determining that the changes of power grid parameters cause the change of the displacement voltage U<N> of the neutral point if, in a time period delta T<1>, the stable increment of the voltage of the neutral point in the distribution network accords with the formula: delta U<N> >= delta U<NL>, but the maximum zero sequence current of the feed lines accords with a formula: I<0N> <= I<0E>, and enabling the grounding fault processing device not to start; and determining that the fault is an instable disturbance grounding fault or an intermittent grounding leakage fault if, in a time period delta T, the stable increment delta U<N> of the voltage of the neutral point in the distribution network does not stably accord with the formula: delta U<N> >= delta U<NL>, or the maximum zero sequence current I<0N> of the feed lines does not stably accord with the formula: I<0N> <= I<0E>.

The invention relates to a pump controller, a PLC platform and a sea water desalting plant. The pump controller includes a start-stop control unit, a condition distinguishing unit, a fault judging unit, a monitoring unit and a device running time recording unit, wherein the start-stop control unit is used for achieving starting and stopping instruction blocking and setting the starting and stoping operations indicated by the starting and stoping instructions to be pulse instructions for automatic reset; the condition distinguishing unit is used for setting and distinguishing pump control operation conditions; the fault judging unit is used for judging whether a fault occurs during the start and stop processes; the monitoring unit is used for monitoring the pump operation state during the start and stop processes; the device running time recording unit is used for automatically recording the device running time and the last start and stop time. According to the invention, the maloperation problem caused by operation instruction blocking is completely solved, the operation conditions are distinguished and queried, faults are effectively judged, and the occurrence rate of maloperation is reduced; in addition, the pump running time and the last start and stop time are automatically recorded, and a basis is provided for the device management, repair 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 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 a high-reliability remote control switching device. The high-reliability remote control switching device comprises a power supply controller, a control cable and a motor loop; the power supply controller (1) is arranged in a control room; the control cable (2) is a power transmission channel; the motor loop (3) is arranged in an electric operation mechanism box; a motor operates under command control of the power supply controller; the power supply controller comprises at least one set of contactors; normally open contacts of the contactors are connected with a power supply power line; normally closed contacts are grounded; coils of the contactors are controlled by input remote control signals; when the remote control signals are input, the normally open contacts are closed and the normally closed contacts are opened; power is supplied to the motor through the control cable; when the remote control signals are not input, the normally open contacts are opened and the normally closed contacts are closed and grounded; and thus, the control cable, the motor loop and the motor coil are grounded. According to the invention, false action or no action of the electric operation mechanism due to external electromagnetic interference can be avoided; and the operation reliability of a power grid or a contact network can be effectively increased.

This invention provides an electric net earthing monitor, in which, the monitor system is composed of a general monitor and several sub-monitors, the earth information test channel is composed of a back-flow isolation diode, a back-flow control circuit, earth terminals and a mutual-inductor, the back-flow control circuit in the general monitor controls an alarm circuit and an action circuit at thesame time.

The invention discloses a method for realizing a reclosing test function of a direct-current relay protection tester based on an FPGA. The device comprises a tester and a direct-current relay protection device, the tester comprises an analog quantity output port A0, a switching value output port B0 and a three-way switching value acquisition interface BI. The direct-current relay protection devicecomprises an analog quantity acquisition interface AI, a switching value acquisition module BI and two paths of switching value output modules BO, an analog quantity output port A0 of the tester is connected with an analog quantity acquisition interface AI of a direct-current relay protection device (hereinafter referred to as relay protection), a tester switching value output port BO and a switching value acquisition interface BI of the tester switching value output port BO are connected in parallel with the relay protection switching value acquisition module BI, and the other two switchingvalue acquisition interfaces BI are electrically connected with the relay protection two switching value output modules BO respectively. The whole tester device is equivalent to an automatic reclosuredevice on a test site, reclosure function logic is realized by the FPGA by utilizing the parallel processing characteristic of the FPGA, and the tester is utilized to simulate the automatic reclosuredevice, so that the operation steps of the whole test system are reduced.

The invention discloses a zero-sequence voltage trip protection method for the low-voltage side of transformers. For the fact that the primary neutral-point earthing of the low-voltage side of a transformer is an unearthed system, the method protects earthing of the low-voltage side of the transformer by configuring one or double voltage transformers on the low-voltage side of the transformer and setting zero-sequence overvoltage trip protection logic, protection input and protection output. Corresponding voltage loop breakage locking logics of the voltage transformers are selected for trip protection by means of changing control words according to configuration and wiring manners of the voltage transformers. The method effectively solves the problem of transformer low-voltage side zero-sequence voltage protection malfunction caused by primary-side and secondary-side voltage loop breakage of the voltage transformers on the low-voltage side of the transformer, and ensures accurate and reliable action of the transformer in case of single-phase earthing fault of the primary loop on the low-voltage side of the transformer.

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 discloses a hot backup system, method and equipment. Wherein, the system includes: a master server, used to receive the write instruction sent by the centralized management module, and write the first data sent by the business server into the database of the master server according to the instruction; a slave server, used to communicate with the master server in real time The server performs data synchronization, and receives the read instruction sent by the centralized management module, and sends the read second data to the centralized management module according to the read instruction, so that the centralized management module sends the second data to the business server; The delay server is used to perform delayed backup of the data operation information generated in the main server according to the preset delay backup parameters; the centralized management module is used to monitor the abnormal operation status of the system, respectively The role of master-slave server and delay server is switched for management. The system achieves better results in solving disaster recovery, malfunction, overload and other problems.

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 belongs to the field of safe operation protection of a power grid system, and discloses a temporary zero-sequence overcurrent protection engineering setting method for a transformer, which includes: firstly closing the transformer to be started, and measuring the flow through the high-voltage side of the transformer and the adjacent The three-phase current of the component; calculate the zero-mode inrush current and the RMS value of the zero-sequence current flowing through the high-voltage side of the transformer and adjacent components; find the corresponding peak value of the zero-sequence current RMS, and calculate the ratio of the two as the proportional coefficient; based on the The proportional coefficient is calculated to obtain the action threshold value and related action delay that can realize temporary zero-sequence protection when the transformer is started and put into operation. The invention also discloses a corresponding tuning system, a computer-readable storage medium and a terminal. The invention can effectively solve the problem of misoperation of the zero-sequence overcurrent protection of adjacent components when the transformer is air-dropped without acquiring any electrical parameters of the transformer and adjacent components, and at the same time has the advantages of simplicity, reliability, easy operation and strong applicability Features.

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.