Method for selecting cross section area of power cable of gas turbine variable-frequency starting device of gas-fired power station

The invention relates to a determining technology of a cable for a static-state variable-frequency starting device of a gas-fired power station, in particular to a method for selecting the cross section area of the power cable of the gas turbine variable-frequency starting device of the gas-fired power station based on the thermal stability cross section algorithm. The method includes the steps that firstly, the quantity Q of heat generated during the starting process of the static-state variable-frequency starting device is worked out; then, the cross section coefficient C of a loop cable conductor of the variable-frequency starting device is acquired; finally, the minimum cross section area S of the loop cable conductor of the variable-frequency starting device is selected according to Q and C on the premise that safety and reliability are guaranteed. By means of the method, the cross section area of the power cable of the static-state variable-frequency starting device can be significantly ...

Four 2 '-fully modified XNA aptamers targeting human thrombin and preparation method of 2'-fully modified XNA aptamers

The invention discloses four 2 '-fully modified XNA aptamers targeting human thrombin and a preparation method of the 2'-fully modified XNA aptamers. The preparation method comprises the following steps: by taking unnatural nucleoside triphosphate of a combination of 2 '-F modified uracil nucleoside triphosphate, 2'-F modified cytidine nucleoside triphosphate, 2 '-OMe modified guanine nucleoside triphosphate and 2'-OMe modified adenine nucleoside triphosphate as elements, carrying out a reaction on the elements under the action of SFM4-6 polymerase, the method comprises the following steps of: directly transcribing and synthesizing a DNA/XNA heterozygote product by taking complementary sequences of four DNA (Deoxyribonucleic Acid) and RNA (Ribonucleic Acid) targeted to human thrombin and partially modified nucleic acid aptamers TBA-15, TBA-29, RNA16.24 and Togle-25 reported in literatures and a transcription primer complementary sequence as templates, and degrading the DNA/XNA heterozygote ...

Electrical cable flow equalizing non-pressure regulating mechanism

The invention relates to an adjusting device for power supply circuit or distribution circuit, in particular to a cable current-sharing non-pressure adjusting device. A current-sharing adjusting device is installed on the same phase parallel cable, which is provided with a magnet with corresponding magnetic inductivity. In case that certain section of the high voltage cable is surrounded by the magnet, the inductive reactance will be enormously increased; therefore, the inductive reactance can be controlled through adjusting the magnet air gap to adjust the current of the cable and reach the current-sharing of the cable. The utility model has the advantages that the magnet is uncharged with small volume, so the operation is simple and convenient; the arrangement does not occupy the sending and receiving ends sites; the loop load loss will not be increased.

Electrical cable flow equalizing non-pressure regulating mechanism

110kV/220kV voltage level composite apparatus and application thereof

The invention relates to a composite apparatus, in particular to a 110kV/220kV voltage level composite apparatus and an application thereof. The composite apparatus is an innovation on the basis of original HGIS, thus being called XHGIS for short. The invention is characterized by providing a novel composite apparatus without a bus isolating switch, and application thereof in power distribution units, and being capable of designing a novel power distribution unit which has convenient installation, extension and operation; the whole technical scheme has less occupation area, can fully utilize the space under the bus, and has the occupation area which is reduced by 30 to 40 percent compared with the typically designed outdoor AIS scheme; the invention has less investment compared with that of HGIS, and the comprehensive investment cost is not in the bad situation any more compared with the AIS scheme; and simultaneously, the invention is also characterized by no need of power off of thebus ...

Construction method for installing vertical grounding electrode by punching and pouring pile

The invention relates to a construction method for installing a grounding electrode, in particular to a construction method for installing a vertical grounding electrode by a punching and pouring pile. In the method, the vertical grounding electrode is fixed on a steel reinforcement cage when the steel reinforcement cage is arranged after punching the punching and pouring pile by combining with the construction of a punching and pouring pile in the civil engineering; and the grounding electrode is arranged in the deep position of the ground to be grounded. The grounding resistance is reduced adequately by a sludge layer with a lower soil resistivity at about 30 meters under a broken stone backfilling region of a sludge backfilling region, and the installation construction of the vertical grounding electrode is completed, so that the requirement of the grounding resistance is met, the construction procedure is simplified, the time and the labor are saved, the construction expenses is greatly ...

Method for lowering wind power field ground resistance by means of wind power field current collection line overhead ground wire and towers

The invention relates to a technique of lowering wind power field ground resistance, in particular to a method for lowering wind power field ground resistance by means of a wind power field current collection line overhead ground wire and towers. According to the method, by combination with construction of overhead current collection lines of a wind power field, the independent current collection line tower grounding grids are connected in parallel to form a line and ground mixing grounding grid by means of the wind power field current collection line overhead ground wire, the line and ground mixing grounding grid is then connected with a grounding grid of a wind power generator and a grounding grid of a boost station area to reduce ground resistance of the whole wind power field grounding grid, requirements of ground resistance are met, project amount is reduced, time and labor are saved, expenses are greatly reduced, and construction cost is reduced.

High-voltage distribution device with double breakers used for single bus segmentation and application thereof

The invention relates to a high-voltage distribution device, in particular to a high-voltage distribution device with double breakers used for single bus segmentation and the application of the high-voltage distribution device. According to the high-voltage distribution device with the double breakers used for single bus segmentation, a segmented circuit with main transformers and power source incoming lines is provided creatively. The high-voltage distribution device comprises the first breaker 1CBF, the second breaker 2CBF and an intermediate node. The two breakers are connected to two sectioned buses. The intermediate node is connected to the second main transformer through a disconnecting switch 2GB. The high-voltage distribution device can be applied to a newly constructed project and an old project which is put into operation through transformation. The high-voltage distribution device with the double breakers used for single bus segmentation has the advantages that the structural ...

电容器组差压调节保护装置

A differential protective system used in transformer, specially, a capacitor differential pressure regulation protective system, comprises capacitors, discharge coil and protective unit. Capacitors are joined up in series to form the capacitor group, which is divided at least one section, in each section setting two arm having differential pressure, each arm is connected with first order side of a discharge coil, the protective unit is connected with homo polarity end of second order side -of two arm discharge coil, the main point of its structure is: also having pressure regulation device of which two end each is connected in parallel with second homo polarity of second order side of two arm discharge coil. The virtue of this invention is: the pressure regulation device adjusts the output voltage of second order side of the discharge coil before the capacitor group protective unit runs, accordingly eliminate or reduce accumulated error of equipment to promote the reliability of protection ...

Limitation inrush current push-pull device

The invention relates to a regulating device for the power supply or power distribution circuit, in particular to a switching device for limiting the flow, which comprises a resistance, an on-off switch, a breaker and a control device that is connected with the on-off switch and the breaker for controlling. The resistance is serially connected with the on-off switch and then parallel connected with the breaker; after parallel connection, the circuit is serially connected with the three-phase line of the electric network device. The invention is characterized in overcoming the technical prejudice of the technicians in the field; the switching device for limiting the flow adopts the resistance as the electric appliance for controlling the excitation flow, and upon completion of controlling the excitation flow, quits the resistance in time, hereby, promising normal operation of the system and achieving fairly well technical effect; besides, the invention provides simple and convenient operation ...

Grounded resistance measuring apparatus

A measuring device which uses two linked switches to carry out detection for measuring device is featured as carrying out stray current and stray voltage measurement of the earth to have accurate measuring result for earthing resistance, carrying out detection for connection state of resistance measuring device to earthing electrode to avoid measurement error caused by break point in connection.

单相接地补偿检测装置

The invention relates to protector for limiting or restraining ground fault current as well as compensating and testing, especially, single-phase ground compensating and testing equipment. The protector includes grounding transformer, loop of arc suppressing coil and loop of resistance. The grounding transformer is three-phase transformer, and one end of triple-phase line is connected to triple-phase line of power network system. Loop of resistance including a resistance and loop of arc suppressing coil including arc suppression coil are parallel connected to each other. One end of the paralleled circuit is connected to neutral point of the grounding transformer, and the other end is connected to ground. The invented circuit also includes a switching device in high/low voltages. The invention provides functions of ensuring personal safety, making fault residual current minimum as well as saving cost and raising compensating and testing performances.

电容器组差压隔离保护装置

A differential protective system used in transformer, specially, a capacitor group differential pressure regulation protective system, comprises capacitors, discharge coil and protective unit, and they are connected in parallel in the order. The main point of the structure is: also including isolation instrument transformer inserted between the discharge and protective unit. The virtue of this invention is: the isolation instrument transformer is adopted in the capacitor group protective unit, it has less turns, high magnetic inductivity, large iron core cross section, so its flux leakage impedance is small, its second output voltage, namely accuracy of load voltage is high, it can largely reduce metering error from apparatus itself, accordingly increase the protective reliability.

110kV/220kV voltage level composite apparatus and application thereof

The invention relates to a composite apparatus, in particular to a 110kV/220kV voltage level composite apparatus and an application thereof. The composite apparatus is an innovation on the basis of original HGIS, thus being called XHGIS for short. The invention is characterized by providing a novel composite apparatus without a bus isolating switch, and application thereof in power distribution units, and being capable of designing a novel power distribution unit which has convenient installation, extension and operation; the whole technical scheme has less occupation area, can fully utilize the space under the bus, and has the occupation area which is reduced by 30 to 40 percent compared with the typically designed outdoor AIS scheme; the invention has less investment compared with that of HGIS, and the comprehensive investment cost is not in the bad situation any more compared with the AIS scheme; and simultaneously, the invention is also characterized by no need of power off of thebus ...

Limitation inrush current push-pull device

The invention relates to a regulating device for the power supply or power distribution circuit, in particular to a switching device for limiting the flow, which comprises a resistance, an on-off switch, a breaker and a control device that is connected with the on-off switch and the breaker for controlling. The resistance is serially connected with the on-off switch and then parallel connected with the breaker; after parallel connection, the circuit is serially connected with the three-phase line of the electric network device. The invention is characterized in overcoming the technical prejudice of the technicians in the field; the switching device for limiting the flow adopts the resistance as the electric appliance for controlling the excitation flow, and upon completion of controlling the excitation flow, quits the resistance in time, hereby, promising normal operation of the system and achieving fairly well technical effect; besides, the invention provides simple and convenient operation ...