Grid electrical technology 2000 years of calcium carbide short-circuit copper gongs and soft cables connected to the board connection method, discuss the Wuhan University of Electric Power University School of Electrical Engineering Yao Mingren brief introduction of the new type between the calcium carbide furnace short wire copper tube and the flexible cable terminal board Connection technology casting fusion welding technology. Compared with the previously used conical surface contact connection, it has the advantages of high reliability, simple processing technology and good economic efficiency. In the interconnection mode of the short-grid components, some methods are necessary, such as between the conductive copper tube and the transformer, the brazed connection of the flexible cable to the cable shoe and the contact of the cable shoe with the flexible cable terminal board by the compensator. Connection, etc. The connection between the conductive copper tube and the flexible cable terminal plate is generally connected by a conical surface contact. This connection method requires high machining precision, large maintenance workload, low operational reliability, and the contact surface is covered by the oxide layer and the contact layer. Resistor increases power loss, so it is necessary to use a new process to improve the connection between the short-wire copper tube and the flexible cable terminal block. 1 Short-wire copper pipe and flexible cable terminal board connection mode 1.1 Short-wire copper pipe and flexible cable terminal board contact connection In the past ten years, after the domestic calcium carbide furnace short net has undergone technical transformation, basically use copper tube as the main body of short net. . Since the electrode needs to move up and down to meet the process requirements during the calcium carbide production process, a flexible conductor or a flexible cable connection between the conductive copper tube and the electrode is required. The copper tube and the flexible cable are often used in the corresponding holes of the copper cable and the flexible cable terminal cable and the cable shoe cable boots and the cable connecting the cable boots, and the cable ends are reflowed and welded to the hole wall. Start. The cable lugs and cable boots are often bolted for maintenance and other requirements. The connection between the copper tube and the flexible cable terminal board has basically been connected by a conical surface contact. The tapered surface contact of the plate is connected to the copper tube and the cast copper flexible cable terminal plate portion, and the corresponding circular hole in the cast copper flexible cable terminal plate is also processed into a tapered circular hole of 125. The copper tube is inserted into the round hole and tightened with a nut, so that the copper tube is in close contact with the cast copper wiring board. The advantage of this connection method is that when the short net is made, the short net can be firstly spliced ​​and welded, and then the conductive copper tube is removed, so that the conductive copper tube is wrapped with the insulating layer or the insulating varnish is applied. The main disadvantages are as follows: high processing precision and high processing cost. There is a fixed contact resistance at the contact connection. And the current flowing through it tens of thousands of amps, so the power loss at the contact connection can not be ignored. Due to the contact connection between the copper tube and the cast copper flexible cable terminal block, the maintenance work is increased. According to the short-network operation and maintenance requirements, the contact voltage should be periodically measured at the contact connection to assess the contact quality and appropriate treatment. In order to cooperate with the regular maintenance of the calcium carbide furnace, the contact surfaces of the short-grid system should be disassembled, the oxide layer should be removed, and the fastening parts that must be replaced should be replaced to ensure that the contact resistance of the contact surface is not greater than the equivalent length of the conductor, the copper tube and the cast copper. The flexible cable terminal block, after the conical surface contact connection, the conductive copper pipe is designed to flow in and out from the end of the flexible cable terminal, so that there are more pipes above the furnace body, which is not conducive to installation and operating. 1.2 Pouring of short-net steel pipe and cast copper flexible cable terminal plate In order to avoid the shortcomings of copper pipe and copper-bonded flexible cable terminal block, the method of welding the conductive copper pipe and the cast copper flexible cable terminal plate into a whole can be adopted. According to the requirements, the copper tube is processed into the desired shape, the oil stain and the oxide layer on the copper tube surface are removed, and the thick thread is machined on the copper tube to be welded with the cast copper flexible cable terminal board. Full, then pre-buried into the sand mold for casting. Thus, when the cast copper part is cast, the copper water melts the copper tube surface, so that the copper tube and the cast copper flexible cable terminal board are integrally formed. The technical requirements for the casting and welding of the S2 copper tube and the cast copper flexible cable terminal board are that the casting surface should have no obvious welding and welding. After the completion of 1 test water pressure 5 does not leak, the technical requirements are easy to meet. Compared with the conical surface contact connection, the casting fusion welding connection has the following advantages. In the casting fusion welding connection, since the conical contact surface is not finished, the processing is simple, easy to operate, and the processing cost is low. Since the copper tube is welded to the cast copper flexible cable terminal board as a whole, there is no contact resistance, so no additional loss due to contact resistance. 3Because the copper tube and the cast copper flexible cable terminal board are welded together to form a whole, there is no contact surface connection, so the short 1 electrician technology has a 2-year 10-year adjustment, and the type of elimination or circle is set up to discuss the Xuhui electric automation equipment in Handan City, Hebei Province. Co., Ltd. Zhang Jingsheng Cao Zhiqiang Shen Da Han Yudong 0刖5, there are three types of arc suppression coils running in China, namely, the adjustable air gap and the DC bias. The adjustable arc suppression coil control device has certain advantages, and it will be widely promoted and applied. 1The characteristics of the adjustable arc-extinguishing coil can be up to 15 times and the maximum adjustable current is up to 3 times. The adjustable air gap type and the adjustable DC bias type are the maximum residual flow time of no more than 3 magic shift time; Phase-to-ground line selection device; double 0å© structure, full Chinese display. 2 Definition of volume-modulated arc-suppression coil The so-called volume-modulated arc-suppression coil is a device that meets the inductor current of the arc-suppression coil by connecting a capacitor of a certain order, specifically to open and close the vacuum contactor to pick up a different number of Capacitor. 3 Capacitor changes the arc-suppression coil inductance. It can be seen from 1 that when the vacuum value is different, the electric xf current is different. If the capacitor is connected with 5 currents, the mesh contact surface is maintained and repaired, reducing the workload. 4 When using the cast fusion joint, the copper pipe at the cable terminal is welded and connected, so that the cooling water flows in and out from the copper pipe at the compensator end. This will reduce the piping above the furnace and improve the installation conditions and operating environment above the calcium carbide furnace. 2 Application examples In May 1988, the Hubei Carol Resin Factory obtained 31 different capacitor currents for electricity. Since the phase of the inductive current and the capacitive current are different by 18, the arithmetic operation can be performed. Therefore, the capacitor current of the arc suppression coil can be converted to the secondary side to cancel the inductor current by opening and closing the capacitor. The inductor current of the arc coil. 4 determine the number of tap gears Currently generally recommended the number of taps recommended by the literature 2 to determine the number of taps, that is, people, minimum gear current, v detuning people. The capacitance of the grid relative to the ground current, the human arc suppression coil compensates the inductor current. It is worth noting that when the value is too large, the grounding still has the possibility of reignition. In severe cases, it cannot even be extinguished. Therefore, the detuning degree should be selected at 5 Capacitor voltage and capacity selection According to the author's design experience, the capacitor voltage selection of 10 is appropriate. The capacity ratio of the four capacitors is 1248, and the capacity ratio of the five capacitors is now an example to illustrate the capacity selection of the capacitor. For example, the specifications of the arc suppression coil are 400, 10, and the casting and welding technology is adopted in the technical transformation of the stone furnace short net. The calcium carbide furnace transformer is 6000kVA, and the secondary phase current is 198, 2=1. In the design of the short conductive copper tube and the flexible cable terminal board, the conductive tube adopts a copper tube with a specification of 07 and 4 layers per phase. The flexible cable terminal board is made of 205, 70.2 cast tin bronze, and the return pipe is made of 1 copper tube. Connection mode 3. Cooling water enters and exits from the short net compensator end. Since the equipment was put into operation, more than ten choices = 23, and 5 capacitors were needed. According to the empirical formula, the capacity of the first capacitor is 1 capacitor voltage. The capacity of the second capacitor is the capacity of the third capacitor. The capacity of the fourth capacitor is the capacity of the fifth capacitor. The selection of the low voltage vacuum contactor is 6 The model of the low-voltage vacuum contactor selected by the author is type 5, and its rated working voltage is 40. The metal film self-healing power capacitor with good electrical performance has a loss of about 0.54. 1 Li Fushou. The operation of the neutral point is not effectively grounded. Beijing Water and Electric Power Press, 19932 Study on Neutral Grounding Method of Power System 1èŠPower Research Institute, Jiangsu Power System Power Supply Technology Information Network. 1998, 4 è¹ ç½— ç½— 义 é“œ é“œ é“œ é“œ é“œ é“œ é“œ é“œ ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— ç½— Block more than one
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