51results about How to "Solve misoperation" patented technology

The invention discloses a method utilizing independent component analysis and S transformation to detect photovoltaic system fault arcs under system process coupling conditions. According to the method, based on a photovoltaic system output current signal, a current independent main source signal is acquired through independent component analysis, after Fourier transformation of the signal, variance processing on the frequency information is carried out to acquire a first characteristic quantity, the current is processed through S transformation, and a second characteristic quantity is acquired through time and high frequency component integration of an acquired time frequency matrix. After comparing the characteristic quantity value with a corresponding set threshold, a weight coefficient is utilized to realize weighing of output determination results of the two characteristic quantity values on a decision layer, and real-time detection on the photovoltaic system fault arcs is accomplished. The method is advantaged in that through dynamic threshold comparison and weight coefficient weighing of the two decision results, essential difference of the photovoltaic system fault arcs generated in a system process can be obviously mined, the photovoltaic system fault arcs under the system process coupling conditions can be rapidly and accurately cut off, and safe and stable operation capability of the photovoltaic system is improved.

The invention discloses a passive power-based method and system for determining field loss protection of a phase modifier. The passive power-based method comprises the steps of performing And gate logic on first starting criterion, first low-voltage criterion and I-segment phase-entering passive power criterion, and performing And gate logic on second starting criterion, second low-voltage criterion and the I-segment phase-entering passive power criterion, wherein two And gate logic results and a OR gate logic form field loss protection I-segment criterion; and performing And gate logic on II-segment phase-entering passive criterion and excitation voltage criterion to form field loss protection II-segment criterion. When data information of the phase modifier conforms to the field loss protection I-segment criterion or the field loss protection II-segment criterion, the field loss protection reliably acts after a preset time threshold is delayed, the field loss protection is reliable without false action when the system is at a low voltage and the phase modifier is in the phase entering running process; and when a completely-demagnetized fault or a partially-demagnetized fault occurs in the phase modifier, the field loss protection acts reliability, and the problem of false operation of the field loss protection of the phase modifier when the system is at the low voltage and the phase modifier runs in a phase-entering way is solved.

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 is applicable to the power system relay protection field and provides an arc short-circuit protection device and control method. The method comprises the following steps: controlling an arc probe to detect a light by utilizing the spectral characteristic, generating an arc signal if the spectral range of the light is in the detection spectral range; controlling an arc detection unit to converting the arc signal to an arc pulse signal; receiving the arc pulse signal transmitted by the arc detection unit, processing, outputting a driving signal to a protection exit circuit and disconnecting all the incoming lines of a bus bar. The arc short-circuit protection device of the embodiment of the invention utilizes the spectral characteristic to detect the light and has the advantage that the protection can not be operated incorrectly under the action of interference light.

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 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 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 present invention provides a method and a system for avoiding same-tower multi-loop vertical connection zero sequence direction protection maloperation. The method and the system are based on station domain information, it is determined whether there is a loop with faults or not through determination of whether a first criterion is established, it is determined whether loops except the fault loops in the multiple loops with voltage levels having faults have zero sequence voltage zero-crossing points or not according to a second criterion, and when loops except the fault loops in the multiple loops with voltage levels having faults have zero sequence voltage zero-crossing points, the reverse compensation is performed; it is determined whether loops with voltage levels without faults have zero sequence voltage zero-crossing points or not according to a third criterion in a same-tower mixed voltage multiple loops, and if yes, the vertical connection zero sequence protection is closed.The method and the system completely solve the problems of the same-voltage and mixed voltage multi-loop vertical connection zero sequence direction protection maloperation of the same tower caused by open-phase operation or break line faults and ensure the precision of the vertical connection zero sequence direction protection so as to improve the electric system maloperation capacity and the power grid safe and stable operation level.

The invention discloses an anti-explosion foam spray fire extinguishing system. The system comprises a fire pump set, a liquid storage tank, a foam proportional mixer, a liquid supply pipe network, horizontal pipelines, pressure telescopic pipes and water mist nozzles. By adopting a telescopic hidden arrangement mode, the reliability of the fire extinguishing system is remarkably improved. By adopting a multi-stage sealing structure, the pressure telescopic pipes solve the problems of easiness in liquid leakage, misoperation, immobility, small applicable pressure range and the like. The multi-section pressure telescopic pipes are adopted, the water mist nozzles can spray water mist close to a fire object, and the problems that an existing water mist nozzle is short in range, insufficient in penetrating force and prone to being influenced by environment wind and fire plume are solved. The fire extinguishing system disclosed by the invention has explosion-proof, dustproof and high-temperature-resistant functions, is safe, reliable, high in fire extinguishing efficiency, long in spraying time, convenient to install and use, small in influence on a protected object, and suitable for extinguishing a fire of a charged oil-immersed transformer; and the technical problem of fire extinguishing of a large oil-immersed transformer is effectively solved, and the system can be used for transporting the oil-immersed transformer and also newly building the oil-immersed transformer.

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 an emergency power supply automatic switch-in device, which relates to the technical field of electricity grids. By means of introducing a pair of input quantities reflecting position of a 1DL circuit breaker, a failed-to-act phenomenon of the automatic switch-in device is solved; by means of introducing a second group of voltage, a misoperation phenomenon of the automatic switch-in device is solved; structure is simple, adding a set of emergency power supply switch-in device in addition is avoided, doubling functions are realized on one set of emergency power supply automatic switch-in device, problems of misoperation and failed-to-act phenomenon of the emergency power supply switch-in device are solved effectively, time and labor are saved, and working efficiency is improved.

The invention relates to an overcurrent protection method based on the closed-loop operation mode of the distribution network, which is used for fault discrimination and removal of the overcurrent fault of the protected object in the distribution network adopting the closed-loop operation mode. Two fault currents are measured at both ends, and the phases of the two fault currents are calculated respectively. Based on the phases of the two fault currents, the fault direction at both ends of the protected object is determined, and the location of the overcurrent fault is determined by comparing the fault directions at both ends of the protected object. , and then cut off the overcurrent fault. The invention also relates to an overcurrent protection device, which includes a fault current detection module, a fault discrimination module and a fault removal module. Based on the closed-loop operation mode of the distribution network, the present invention solves the problem of maloperation or refusal to operate in the closed-loop distribution network, and can quickly and reliably perform overcurrent protection, thereby reducing the occurrence of faults in the distribution network in practical applications. The range of power outages caused, and the time of power outages are reduced.

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 relates to an online optical detection sensing device for an electric secondary pressure plate position of a substation. The online optical detection sensing device comprises a protective cover and a locating plate, wherein the locating plate is arranged in the protective cover; a rotating shaft is arranged at the center of the locating plate; an input locating light guide post and an exit locating light guide post are arranged in the rotating shaft; optical fibers with the same sizes are respectively embedded into the input locating light guide post and the exit locating light guide post; a light input optical fiber, an input light output fiber and an exit light optical fiber are arranged on the edge of the protective cover; two ends of the input locating light guide post are respectively connected with the end parts of the light input optical fiber and the input light output optical fiber through rotating the locating plate; and two ends of the exit locating light guide post are respectively connected with the end parts of the light input optical fiber and the exit light output optical fiber through rotating the locating plate. According to the online optical detection sensing device, the operation safety and reliably and the intelligent detection level of the substation are improved; a switching misoperation of an inspector is effectively prevented; and the inspection, operation and maintenance cost is reduced.

The invention relates to the field of power supply monitoring devices, and especially relates to a power grid grounding fault judging device. The power grid grounding fault judging device prevents misoperation by adopting technologies such as using a leakage current to control actions, improving sampling sensitivity, adopting electromagnetic shielding, and setting a threshold to obstruct interference. The power grid grounding fault judging device is provided with a special power supply circuit and an overvoltage protection circuit for improving adaptive capability of the judging device; and two optional functions of alarm and action are set for facilitating electricity utilization customers. The power grid grounding fault judging device is mainly cooperated with a general monitor, is applied to a neutral point ungrounded system, and can be applied to a grounding system independently for judging grounding fault positions. Main electronic circuits such as a special power supply, an overvoltage protection circuit, a sampling device, an alarm device, an action device, and D1, D2, D3 backflow isolation devices are arranged in a special shell and packaged into a leak current sampling module 3DCsquare by using a special glue to form an element which is reliable and durable, and the element can be used for forming various kinds of grounding fault judging devices.

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 single-coil pulse track circuit receiving device including an isolation and adjustment module and a pulse track circuit receiver for receiving asymmetric pulse signals. The isolation and adjustment module outputs the asymmetric pulse signals to the pulse track circuit receiver through the integer of a single coil; the pulse track circuit receiver distinguishes the asymmetric pulse signals and triggers a track relay, or sends the distinguished results to a signal control system, such as interlock or train control, etc. The device can be applied to pulse track circuits of track sections of different traction types, such as electrization, non-electrization, etc., thereby avoiding faulty operation of the signal control system and ensuring safety in travelling.

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 provides a portable SV / GOOSE common network maintenance isolation device and method. The portable SV / GOOSE common network maintenance isolation device comprises a forwarding module, a management module, a power supply module and a transmission module, wherein the transmission module is used for receiving and sending an SV message and a GOOSE message, the forwarding module is used for forwarding the SV message from a relay protection tester to a relay protection device according to a message management strategy, and then forwarding the GOOSE message generated by the relay protection device to an intelligent terminal, the management module is used for configuring the message management strategy, and the power supply module is used for providing a power supply for the safety maintenance isolation device. According to the invention, the SV / GOOSE message is forwarded among the relay protection tester, the relay protection device and the intelligent terminal through the forwarding module and the transmission module, so that physical decoupling with a running process layer network is realized, and the problems of protection device maloperation or switch collapse caused by transmission of fault quantity in a switch when fault quantity is added to the process layer switch in prior art are solved.

The invention discloses an indicator and an electric power apparatus. The indicator includes a switch, an indication device and an alarm device, wherein the switch is used for switching on or switching off the indicator, the indicating device is connected with the switch and is used for indicating that the electric power apparatus is in an electrification state after the indicator is switched on, and the alarm device is connected with the switch and comprise a heat sensor, an alarm distance adjusting device and an alarm, wherein the alarm distance adjusting device is used for setting an alarm distance, the heat sensors is used for detecting a distance between a heat source and the electric power apparatus, and the alarm is connected between the heat sensor and the alarm distance adjusting device and is used for giving an alarm about the electrification of the electric power apparatus when the distance between the heat source and the electric power apparatus is smaller than the alarm distance. With the indicator and the electric power apparatus of the invention adopted, the electrification state of the electric power apparatus can be indicated, and electrification alarm can be realized when a worker approaches an electrified apparatus.