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1、精选优质文档-倾情为你奉上 本科毕业设计(论文) 中英文对照翻译 院(系部) 信息 专业名称 电气工程及其自动化 学生姓名 李翰成
2、60; generally larger capacity filter capacitance, the transient over-voltage shock absorption of a certain extent, the station Low-voltage transformer side go to feed between
3、0;the screen using a shielded cable and equipment have a good grounding, the use of modern technology to analyze mine, we must increase the circuit's segregation meas
4、ures, because its grounding, protection and other electrical grounding all Grounding devices using the same equipment, and equipment are in a LPZOB, the relative strength of
5、160;strong electromagnetic pulse, the station changed to prevent low-pressure side although there are lines intrusive wave arrester, but the residual pressure high, in the substati
6、on of lightning, through the line Coupling and the potential rise caused by over-voltage counterattack still exist, and high-pressure side of the residual pressure as high
7、0;as several thousand volts, it is necessary to these scheduling automation equipment for the power supply over-voltage circuit protection. Lightning Protection in accordance with
8、the principle of regional division, substation equipment in the secondary power supply system over-voltage sensors lightning protection may be two (B, C level) for the protect
9、ion of segregation. B-mine use is generally greater flow capacity of the mine installations, the Lightning could be more casual Liuxie people, to achieve the objective of
10、 current limit, over-voltage at the same time will reduce to a certain extent, c-mine use With lower residual pressure of the mine installations, you can loop in
11、0;the remaining scattered lightning Liuxie people, to limit the purpose of over-voltage, over-voltage equipment can be reduced to the level of tolerance. The main power
12、supply system is inhibited lightning protection and operation of the power back to the road and over-voltage surge. According to the substation status of the substation o
13、f the second mine-sensing system and the operation and use of two over-voltage protection. As build more substations in the region more open, relatively strong electromagnetic
14、 strength, power lines and communication cables are very vulnerable to lightning attacks sensors, sensors along the over-voltage power lines and communication lines into one d
15、evice, which will damage equipment, Therefore, the exchange of first-class bus to install the power protection (B level) is to ensure the safety of the entire
16、0;control room, and 80 percent of the over-voltage China, scattered to the earth, play a primary role in the protection, but are still in the exchange of feeder
17、;Some of the B-level power supply voltage and mine the residual pressure increases on-line and must therefore be important in the exchange of feeder lines (DC charging
18、60;screen, UPS, etc.) c-level power protection, which would curb over-voltage electrical equipment to back-end To the level of tolerance. Protective location: It is 1 EC1312 (
19、LEMP protection "in the region of lightning protection principles. Arrester installation should be in different locations at the junction of protected areas, this network, the
20、 first-class protection should be located in the bus exchange. In Two on the bus with the installation of a B-class models of a three-phase power supply voltage
21、;surge protector. Install Location: AC bus (cabinet). 3.2 second-class protection measures to deal with charge screen, the installation of c-level three-phase
22、power arrester. As DC charging screen is two-way exchange of electricity supply, so the screen in the DC charge with the installation of two models of c-level three-
23、phase power supply over-voltage surge protector. Installation location should choose the DC charge screen open exchange of air power. 3.3 integrated automation system
24、over-voltage protection Protective position: Computer-based integrated automation system's ability to bear a very low voltage, several hundred volts of over-voltage is enough
25、;to damage the equipment, so must the high side arrester the residual pressure (thousands of volts) to further curb to meet equipment Insulation level of need, and b
26、ecause of the potential rise to power and the induction loop is also over-voltage line up on KV, to be used in the exchange of integrated automation system to
27、160;the exchange on the c-level single-phase installation of a surge Voltage protection. Location should choose to install automated-ping in the Composite Air switch the
28、60;AC power. 3.4 did not ask off power supplies (UPS) over-voltage protection Protection here: because of the internal computer systems, hubs, monitoring equipment, electric
29、 energy billing systems and so on through the UPS power supply protection, in order to protect the safety of these micro-electronics equipment, the UPS power supply
30、device in front of the installation of a c-Surge Voltage protection. Optional models: The (UPS for single-phase power input) C-class single-phase power surge or over-voltage p
31、rotection (UPS for the three-phase power input) of c-level three-phase power supply over-voltage surge protector. Installation should choose the location of UPS into the front
32、;line. 3.5 communication interface over-voltage protection Communication Interface over-voltage protection compared with the grid supply system, this over-voltage circuit on th
33、e degree of sensitivity is much higher, and these are over-voltage equipment in the circumstances it is very fragile. Equipment insulation tolerance level is very low. Wi
34、th the equipment connected to a signal line, data lines, measurement and control lines, and these are basically in line LPZOB region, but also through the LVZOA regi
35、on, on the lines of sensors over-voltage relatively strong, according to the IEC test, when the electromagnetic field Strength increased to 0.07 GS, will have a micro-com
36、puter equipment malfunction, loss of data. And the safety of these circuits is directly related to a system of safety equipment, so important to be on the interface&
37、#160;circuit over-voltage protection. 3.5.1 remote computer interface devices over-voltage protection Protective position: As substation computer remote installations scattered distribut
38、ion structure. From remote modules, intelligent telemetry module, intelligent remote control module, intelligent remote-module. The modules are installed in different automated-ping,
39、;through the RS232 interface between the modules or field bus communication. These interfaces are in the indoor circuit, equipment interface circuits shorter the distance, so
40、there will be no more sensors to the over-voltage, but the automation equipment and other secondary equipment (measurement unit, computer, etc.) have electrical connections, when
41、160;Other secondary equipment sensors to a strong over-voltage sensors, will be counter to these automation equipment, communications interface, so that damage to equipment interface
42、60;circuits, it is necessary in these devices RS232 interfaces on the installation of a surge Voltage protection. Installation location should choose the remote computer interface&
43、#160;devices, communications lines. 3.5.2 electric energy billing system signals over-voltage protection A protective position: a multi-functional electronic power substation table,
44、 energy acquisition, the electronic power meter to bear a very low voltage levels. As Meter and remote computer stations in the communications equipment used RS232 interf
45、aces, the communication line is longer, and in LVZOB region, near the substation or by direct lightning strike at the substation, proximity to the high voltage sensors,
46、160;In order to prevent damage to equipment. E-Meter in and around the RS232 port RS232 installation of the over-voltage surge protector. Location should choose to install
47、0;electronic power meter in and around the port, RS232. The location of protection: electronic power meter through the acquisition of information on the collector's MODEM
48、 (modem) from telephone lines to send data to a remote, since the introduction of telephone lines from the outside, the lines on the sensor to sensor lightning
49、current relatively strong, easy to Modem interface equipment damage, it is necessary in the telephone line modem interface, the installation of an interface over-voltage surge
50、;protector. Location should choose to install telephone Chuxian inside and outside phone lines-the-line people. 3.5.3 distance communication interface over-voltage protection Protec
51、tive position: Since the basic use of unmanned substation. On the first circuit protection, measurement, control, regulation of signal through the optical and data communications
52、160;network or carrier to the distance (in tune, and stressed that the centralized control stations, etc.) to transmit data. If the carrier, the carrier and the computer&
53、#160;automation of the signal devices connected relatively long lines, substations in the vicinity of a direct lightning strike or substations.Should be a strong over-voltage senso
54、rs, to be near the computer automation devices to signal I: I-the installation of signal arrester, while in the area and extend to LPZOB LPZOA area of communication&
55、#160;lines (DDN, X.25) very easy Lightning sensors on the over-voltage, must also be the installation of over-voltage surge protector. Installation location should choose the remot
56、e device communication line interface Department. system over-voltage substation protection issues in recent years by a new task, the above is only related to the
57、scene of the unit into the actual situation on the Protection of the preliminary measures, it will be in continuing to draw on practical experience of running a
58、;summary analysis and continuous improvement, Hope that the new substation in the future or the old substation automation of integrated, strengthen the secondary over-voltage prote
59、ction system of planning and design, equipment and ensure the safe and stable operation of power grids. 3.1.2第二级防护处理措施 对于较为重要的交流馈线上的设备,此处为直流充电屏,加装c级三相电源避雷器。由于直流充电屏是两路交流供电,所以在直流充电屏处加装两个同型号的c级三相电源浪涌过电压保护器。安装位置宜选择在直流充电屏交流电源空气开关处。 3.2 综合自动化系统过电压防护 防
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