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.

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.

An adaptive regulation method for a bus protection ratio braking coefficient of a microcomputer bus protection based on bus bar current includes the following steps: evaluating the bus bar circulation coefficient of a bus bar based on two bus bar currents correlated to the bus bar, regulating the previous ratio brake coefficient to get the regulated ratio brake coefficient to be used in the microcomputer bus bar protection differential criterion to increase its reliability.

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 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 provides a high-voltage transmission line fault location method based on a multi-source data set theory. When a line fails, defect information of the line and the real-time information of a weather system are queried according to the position information of the fault, the real fault position and the actual cause of line failure are determined, and a suggested solution is put forward. The time of fault handling is greatly shortened for the staff, and the economic loss caused by the fault is reduced.

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 a novel series capacitor compensation line distance protection method combined with a phase-comparison relay. Compensation voltage is calculated from the current and voltage value at the protection installation. 2) Phase comparison relay action discrimination: compare the phase according to the calculated compensation voltage and the corresponding positive sequence voltage at the protection installation; 3) Protection logic: if the phase comparison relay operates, then Directly open distance protection without any anti-overrunning measures; if the phase comparison relay fails to operate, it will be put into level detection logic. The invention improves the sensitivity of the distance protection on the basis of reliably preventing overrunning. When the compensation capacitor is installed at the end of the line, the sensitivity of the distance protection is basically not affected by the compensation capacitor, has high reliability and is easy to realize.

The invention discloses an opening and closing device, comprising: a first voltage relay, which closes the contacts when the increased value of the zero-sequence voltage in the secondary circuit reaches a preset value; a first time relay, which is used to After the contact of the first voltage relay is closed, the contact is closed after a delay of t1; the first intermediate relay is used to close the trip contact of the primary loop operating handle after the contact of the first time relay is closed; the second time The relay is used to close the contact after a delay of t2 after the contact of the first voltage relay is closed; the second intermediate relay is used to trip the secondary circuit operation handle after the contact of the second time relay is closed. The contact is closed. The opening and closing device provided by the present invention can automatically open and close the first circuit, the second circuit and the third circuit, realize rapid and reliable removal of the ground fault line of the 6kv neutral point ungrounded system, reduce the scope of influence, and ensure personal safety .

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 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.

Disclosed are a fast switching system and a control method. In the fast switching system, one end of a circuit breaker QF is connected to the transformer T0 and then grounded, one end of a reactor L is connected to the circuit breaker QF, and the other end is connected to the high voltage end of a fast mechanical switch S; The other end of the fast mechanical switch S is connected to the low-voltage end of the plasma jet trigger switch TSG; the high-voltage end of the resistor divider PT is connected to the high-voltage end of the plasma jet trigger switch TSG, and the other end is connected to the ground, and the Rogowski coil The CT is set on the low-voltage end of the plasma jet trigger switch TSG, the output end of the drive module is connected to the trigger end of the plasma jet trigger switch TSG, the input end of the controller is connected to the measurement signal of the resistance divider PT, and the control The first output end of the device is connected to the drive input end of the drive module, and the second output end is connected to the control end of the fast mechanical switch S.