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.

In the case where the living tissues in the patient's body is resected as well, it is possible to suture the resected portion immediately without replacement with another treatment device after resection. Thus, prevention of bleeding from the resected portion or earlier repair of an ulcer that occurs with the resected portion can be carried out for the patent lowly invasively and easily.

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.

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 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 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.