49results about How to "Reliable resection" patented technology

An endoscopic treatment system is designed to suture or resect a lesion while ensuring the ease of insertion into a deep region in the large intestine. The endoscopic treatment system comprises an endoscope and a therapeutic instruments insertion aid into which the endoscope is inserted. The endoscopic treatment system further comprises: a pair of clamp forceps that clamps and lifts a living-body tissue; a lateral hole formed in the therapeutic instruments insertion aid and used to control the position of the living-body tissue clamped and lifted by the pair of clamp forceps or to control the lifting thereof; a ligature used to ligate the living-body tissue whose position or lifting is controlled by the lateral hole; and a cutter used to resect the living-body tissue at a position between a region ligated with the ligature and a region clamped and lifted with the pair of clamp forceps.

The invention relates to an adaptive cascade direction interlocking relaying method based on GOOSE (Generic Object Oriented Substation Event), which comprises the following steps: 1) initial interlocking directions of protective relays are set according to an initial interlocking direction tuning rule; 2) a directional element judges the direction of a current fault current which is compared with the initial interlocking directions by a direction comparator to judge whether the directions of two parts are the same, if yes, the step 3) is carried out, if not, IN2 is gated, and a interlocking signal is output to OUT2; 3) the direction comparator gates IN1, and outputs the interlocking signal to the OUT1 and the direction of the output signal is opposite from the initial interlocking direction at this time; 4) a receiving virtual terminal judges whether the interlocking signal is received, if yes, the interlocking is carried, if not, the step 5) is carried out; and 5) an over-current element judges whether the current fault current exceeds a local over-current protection starting fixed value, if yes, a trip signal is sent. In comparison with the prior art, the method has the advantages that the safe and reliable operation of a system is ensured and applicability is good.

The invention discloses an inter-turn protection method for a power generator, and the technical problem to be solved is to ensure the safe and reliable operation of inter-turn protection for the power generator while improving the sensitivity. The inter-turn protection method for the power generator adopts a steady state quantity section and a mutation quantity section of the power generator as criteria for judgment; and the steady state quantity section is used as long-term protection of inter-turn faults for the power generator, and the steady state quantity section exits by catching the first electrical transient feature of the inter-turn faults of the power generator from 20 to 60ms after start-up. Compared with the prior art, the inter-turn protection method comprises the steps of using the mutation quantity criterion which is in short-term input and can only be inputted once for sensitively and rapidly removing most of the inter-turn faults in a region, using the steady state quantity criterion for reliably removing other inter-turn faults in the region by short time delay, and simultaneously introducing a mutation quantity negative sequence forward starting element and a mutation quantity positive sequence reverse blocking element for ensuring the reliability of the mutation quantity criterion, thereby ensuring the safe and reliable operation of the inter-turn protection for the power generator while improving the sensitivity.

The invention discloses a transient directional protection method for an AC line of a high-voltage AC / DC compound system. The transient directional protection method specifically comprises the following steps of detecting electric signals at two ends of the protected AC line through current transformers at two ends of the line of the compound system separately; preprocessing the detected electricsignals to obtain current break variables at two ends of the protected AC line, switching sampling of a protection system into a high data acquisition frequency and extracting corresponding voltage and current according to the width of a data window; calculating a front travelling wave and back travelling wave total of the current; calculating wavelet coefficients; adaptively eliminating interference values of the obtained wavelet coefficients and obtaining a synchronously extruded wavelet coefficient through extrusion processing of the wavelet coefficients, wherein the synchronously extrudedwavelet coefficient represents the energy of a transient current wave; calculating the transient energy ratio of the front travelling wave to a back travelling wave of the current; and comparing the sizes of the energy ratio and a setting value to distinguish an internal fault from an external fault. According to the transient directional protection method, the AC line of the high-voltage AC / DC compound system is provided with relay protection.

This invention discloses a protection device of a phase compensation impedance relay including: A,B and C are compensated in terms of phase separately to make up of a phase compensation impedance relay connecting to jump A, jump B, jump C by transmission lines and connecting to a three phase jump device by AND gate for detecting transmission line phase A,B, C performance and state, if one phase faults, then only one phase jump is realized, if two or three phases fault, then three phase jumps are realized.

The invention discloses a shore power supply system for ships and a power supply method thereof. The shore power supply system comprises a transformer, power load for land, and power load for ships, wherein the low-voltage side of the transformer is grounded through a grounded circuit breaker and a grounded impedance which are connected in parallel; the power load for land and the power load for ships are connected in parallel and are connected with the low-voltage side of the transformer; a circuit breaker of the power load for land is arranged between the power load for land and the transformer; a circuit breaker of the power load for ships is arranged between the power load for ships and the transformer; and the grounded circuit breaker and the circuit breaker of the power load for land are interlocked. When no ship pulls in the shore to use the shore power supply system, the grounded circuit breaker is switched on, so that the grounded impedance is in short circuit, and the shore power supply system supplies power to the power load for land; and when a ship pulls in the shore to use the shore power supply system, the circuit breaker of the power load for ships is switched on, the grounded circuit breaker is switched off, the shore power supply system is grounded through the grounded impedance, and the power load for land and the power load for ships share the same shore power supply system. The shore power supply system has the advantages of rapid switch of power supply modes, reliable work, comprehensive protection means, and capacity of improving the utilization efficiency and working security and stability of the shore power supply system.

The invention provides a method for improving the fault location accuracy of an extra-high-voltage DC transmission line. According to the method, in case of a line fault, line defect information, a meteorological system and other real-time information are inquired according to position information of the fault to determine the real fault position and actual reasons which cause the line fault, so that solution suggestions can be put forward, the fault handling time is greatly shortened for staff, and economic loss caused by the fault is reduced.

The invention relates to a relay protection method and device of a power distribution network containing a distributed power supply. The relay protection method comprises the following steps of carrying out equivalence on the distributed power supply and a load at an access point of the distributed power supply to acquire an equivalent circuit of a downstream circuit of a protected circuit; calculating a main protective current setting value of the protected circuit according to the equivalent circuit, and setting the main protective current setting value as an action current value of an overcurrent protection device of the protected circuit; calculating a backup protection current setting value of a downstream section adjacent to the access point of the distributed power supply; and setting the action current value of the overcurrent protection device of an upstream section adjacent to the access point of the distributed power supply as the backup protection current setting value after prolonging a predetermined time interval when the overcurrent protection device of the downstream section adjacent to the access point of the distributed power supply does not act. By the relay protection method, a perfect communication network is not needed, the influence of the distribution power supply on relay protection is eliminated, and the relay protection circuit setting value can be automatically adaptive to an access situation of the distributed power supply. The relay protection method is simple and practical and is simple in calculation.

Provided is a high-voltage direct current convertor station no-grounding operation protective tripping method. According to the method, when the convertor station is in a no-grounding operation mode, different protective tripping methods can be configured according to the characteristics of a double-pole ground operation mode and a single-pole metal loop operation mode. In the single-pole metal loop operation mode, when protective tripping is conducted on one pole, the protective tripping logic of the pole is executed; in the double-pole ground operation mode, when protective tripping is conducted on one pole, the protective tripping logic of the pole is executed, a protective tripping command of the pole is sent to the other pole, the protective tripping logic of the other pole is also executed, as a result, the shortest time different between tripping of the two poles can be guaranteed, the values of the currents flowing into a grounding grid from the two poles are minimized, and the safety of station equipment and operating crew is guaranteed.

The invention discloses an active power flexible control method of a new energy power station. The active power flexible control method comprises the following steps of: sampling the voltage of a current collection bus of the new energy power station and the current of each feeding line by an active power flexible control device, and calculating active power of power generation of each feeding line; acquiring and calculating total active power of power generation of the new energy power station and acquiring a switch position of each feeding line; receiving a planning active power value of power generation of the power station from a dispatching master station and forwarding to an automatic gain control (AGC) system in the station; and adjusting the total active power of the power generation by the AGC system within a set delay time if the total active power of the power generation of the current power station exceeds a pre-set protective constant value, and selectively cutting a part of feeding lines and reducing the total active power of the power station to below the active value if the active power of the power generation is not adjusted to be below the planning active value by the AGC system. The invention also provides the active power flexible control device. The active power flexible control method is rapid and reliable, the output active power cut by the power station is reduced as much as possible, clean energy is utilized to the maximum, and electric energy production is increased.

The invention provides an oil-immersed distribution transformer overheating protection method featured by comprising the following steps: embedding an overheating protection system in an electronic intelligent low voltage breaker; enabling the overheating protection system to integrate distribution transformer load current values obtained in a continuous monitoring time so as to obtain an equivalent load, calculating the winding maximum hot point temperature value according to an environment temperature, an equivalent load current and a continuous time, and determining whether to execute a release motion or not according to the winding maximum hot point temperature value and thus automatically cutting off the distribution transformer from the power grid; enabling the overheating protectionsystem to determine the monitored distribution transformer oil surface temperature size, thus determining whether to execute the release motion so as to automatically cut off the distribution transformer from the power grid or not, and carrying out overheating protection for the distribution transformer. The distribution transformer overheating protection method can reasonably, accurately and reliably automatically cut off the distribution transformer from the power grid under overheating conditions, thus intelligently and automatically protecting the distribution transformer.

The invention discloses a single-end electrical quantity full-line quick-acting protection method using a choke coil to construct the line boundary, according to the topology of different power supplysystems, the choke coil is installed on the line to construct the line boundary, and then the protection criterion is constructed according to the difference of the electric quantity between the protected line area and the internal and external faults, so as to realize the single-end electric quantity full-line quick-action protection. The invention adopts choke coil to construct the boundary ofthe circuit and realizes the single-end quantity full-line quick-acting protection on the circuit without boundary element, As that method of the invention can effectively overcome the problem of lowsensitivity of the pow frequency protection of the alternating current circuit in the multi-converter, It also meets the requirements of fast operation of protection for DC lines. At the same time, itdoes not need protection coordination when applied to distribution network. Only the electrical quantity of a single end can realize the rapid identification of faults inside and outside the protection zone, and it can effectively solve the relay protection problem of a power grid including multiple converters.

The present invention relates to a three-phase inverter circuit integrated with drive and charging functions, an electric vehicle drive and charge function integration device, and a vehicle. Accordingto control of switches in a first charge circuit and a second charge circuit, charging for a power battery can be achieved, and according to control of switches in a first drive circuit and a seconddrive circuit, drive of the motor can be achieved by employing the power battery. Three-phase winding of the motor is not required when the power battery is charged, namely, connection or disconnection of the three-phase winding does not influence the normal charge of the battery. When a power tube of the inverter circuit generates short-circuit faults, an inverter bridge module with short-circuitfaults can be stopped to work through control of on-off of switches in the (first / second) charge circuits and the (first / second) drive circuits, and the normal work of inverter bridge modules withoutfaults can be ensured so as to ensure normal charge and drive of the vehicle when one inverter module has faults.

The invention discloses a current longitudinal differential protection device and method based on GPS synchronization. Each current longitudinal differential protection unit is used for being connected with three ends of a T wiring line, and each current longitudinal differential protection unit comprises a GPS module, a clock module, a communication module, a sampling module and a data processingmodule; the GPS module generates a second pulse signal; the clock module generates a time signal; the sampling module samples a local signal to form local sampling data and sends the local sampling data to the data processing module, and the data processing module marks a time label based on a time signal generated by the clock generation module; the communication module is connected with the data processing module, receives sampling data of other ends of the T wiring line, and sends local sampling data to the other ends of the T wiring line; and the data processing module realizes current longitudinal differential protection of the T wiring line. Current longitudinal differential protection can be used as main protection of a multi-terminal distribution line, line faults can be rapidly and reliably removed, and reliable and stable operation of a power distribution network is guaranteed.

The invention provides a method for improving the accuracy of fault location of ultra-high-voltage direct current transmission lines. When a fault occurs on the line, the method can determine the real fault location by querying the defect information of the fault line and real-time information such as meteorological systems according to the location information of the fault. And the actual cause of the line failure, so as to propose a solution, which can greatly shorten the time for the staff to deal with the failure and reduce the economic loss caused by the failure.

The invention provides a pilot protection method of a VSC-HVDC (Voltage Source Converter-High Voltage Direct Current) power transmission circuit based on shunt capacitance parameter identification. According to the pilot protection method, internal and external faults are distinguished by identifying shunt capacitance values at two sides of the VSC-HVDC power transmission circuit by adopting a time domain algorithm. When the direct-current power transmission circuit generates an external fault, the capacitance values at two sides of the circuit can be accurately identified simultaneously; and when the direct-current power transmission circuit generates an external fault, the capacitance values at two ends of the circuit cannot be identified simultaneously. According to the characteristics, pilot protection criteria are constructed. The pilot protection method is simple in principle, easy to implement, not affected by transition resistance, circuit distributed capacitance and control modes and can be used for rapidly and reliably distinguishing the internal and external faults under various working conditions. The pilot protection method can be not only used for supplementing main protection of the traditional VSC-HVDC power transmission circuit, but also used for accelerating backup protection action. The pilot protection method provided by the invention is not only suitable for a two-end VSC-HVDC system, but also suitable for a multi-end VSC-HVDC system.

The invention discloses a grounding test device and method for stators and rotors of power generators. The device comprises a test line; one end of the test line is connected with a test clamping device and the other end of the test line is connected with a first static contact; the static contact is fixed at the top of an insulation box; a second static contact is arranged at the top of the insulation box; a certain safe distance exists between the first static contact and the second static contact; a remote-control lifting device is arranged in the insulation box; the remote-control liftingdevice is used for driving safety bracket to move up and down, so as to realize conduction or disconnection between the first static contact and the second static contact; the second static contact isconnected with the input end of a remote-control resistance switching device; and the output end of the remote-control resistance switching device is used for being electrically connected with a grounding body. According to the device and method, the testers do not need to wear insulation gloves, hold insulation rods to carry out test, and complete all the tests through remote-control operationsat an enough safe distance, so that the safety of the whole test can be greatly improved.

The invention provides a pilot protection method and device and a storage medium. The method comprises the following steps: acquiring time domain signal data of a target element at a preset sampling frequency; performing fusion processing on the time domain signal data of the plurality of first sampling periods to obtain first time domain signal combined data; based on a machine learning model, judging whether the target element has a fault according to the first time domain signal combination data; when it is judged that the target element breaks down according to the first time domain signal combination data, whether the target element breaks down in a second sampling period or not is judged according to the second time domain signal combination data based on a machine learning model, and the second sampling period is a sampling period after it is judged that the target element breaks down; and when it is judged that the target element has the same type of faults in multiple continuous second sampling periods, controlling the pilot protection system to execute a protection action on the target element. A machine learning model is utilized to realize fault identification of power system elements, so that the protection performance of a smart power grid is remarkably improved.

The invention discloses a combined optimization method for protection locking based on busbar protection and quick-cutting device for high power plants, which belongs to the field of relay protection for power plant generator-transformer units. Solve the defect that the quick-cut device cannot be locked after the protection action of the high-voltage plant busbar, causing the quick-cut device to close the high-voltage backup circuit breaker to the faulty busbar. In this method, the secondary tripping circuits of the high-voltage working incoming line circuit breaker and the high-voltage standby incoming line circuit breaker for busbar protection are firstly optimized and transformed, and the closing command of the high-voltage standby incoming line circuit breaker of the blocking fast-cutting device after the busbar protection action is realized and self-maintained ; At the same time, optimize the abnormal voltage blocking logic of the fast switching device, and increase the bus fault judgment logic to block the fast switching device. The invention only needs to add a small amount of secondary equipment and reform part of the circuit, and modify the software logic and fixed value of the fast cutting device to realize it, which is simple and easy.

The invention discloses a shore power supply system for ships and a power supply method thereof. The shore power supply system comprises a transformer, power load for land, and power load for ships, wherein the low-voltage side of the transformer is grounded through a grounded circuit breaker and a grounded impedance which are connected in parallel; the power load for land and the power load for ships are connected in parallel and are connected with the low-voltage side of the transformer; a circuit breaker of the power load for land is arranged between the power load for land and the transformer; a circuit breaker of the power load for ships is arranged between the power load for ships and the transformer; and the grounded circuit breaker and the circuit breaker of the power load for land are interlocked. When no ship pulls in the shore to use the shore power supply system, the grounded circuit breaker is switched on, so that the grounded impedance is in short circuit, and the shore power supply system supplies power to the power load for land; and when a ship pulls in the shore to use the shore power supply system, the circuit breaker of the power load for ships is switched on, the grounded circuit breaker is switched off, the shore power supply system is grounded through the grounded impedance, and the power load for land and the power load for ships share the same shore power supply system. The shore power supply system has the advantages of rapid switch of power supply modes, reliable work, comprehensive protection means, and capacity of improving the utilization efficiency and working security and stability of the shore power supply system.

The invention discloses an inter-turn protection method for a power generator, and the technical problem to be solved is to ensure the safe and reliable operation of inter-turn protection for the power generator while improving the sensitivity. The inter-turn protection method for the power generator adopts a steady state quantity section and a mutation quantity section of the power generator as criteria for judgment; and the steady state quantity section is used as long-term protection of inter-turn faults for the power generator, and the steady state quantity section exits by catching the first electrical transient feature of the inter-turn faults of the power generator from 20 to 60ms after start-up. Compared with the prior art, the inter-turn protection method comprises the steps of using the mutation quantity criterion which is in short-term input and can only be inputted once for sensitively and rapidly removing most of the inter-turn faults in a region, using the steady state quantity criterion for reliably removing other inter-turn faults in the region by short time delay, and simultaneously introducing a mutation quantity negative sequence forward starting element and a mutation quantity positive sequence reverse blocking element for ensuring the reliability of the mutation quantity criterion, thereby ensuring the safe and reliable operation of the inter-turn protection for the power generator while improving the sensitivity.