The adjacent electric national railway line might influence the signal cables of the urban transit line from Xizhimen to Dongzhimen in Beijing. The paper introduces how to determine the protection measures in the project design against the interference to the signal cable.
Electromagnetic interference(EMI) can couple electronic equipment through any number of interfaces of the equipment to its external environment ,e. g. ,power and input/output signal cables.
The network communication control system uses locale bus module and small control case of power control apparatus takes the place of electrical control cabinets and densely covered signal cables. By using Ethernet , factory management departments realize the on-line monitoring, programming, and managing. The superior function achieves close combination of the bottom control system( workshop bus module of transmission facilities ),mid-monitoring system and workshop data management, and efficient communication.
The adjacent electric national railway line might influence the signal cables of the urban transit line from Xizhimen to Dongzhimen in Beijing. The paper introduces how to determine the protection measures in the project design against the interference to the signal cable.
Several factors contributes to the damages on control equipment such as the bad grounding of power supply and signal cables, virtual earth and utilizing installing bracket as grounding etc.
Lightning current in the Down-conductor system brings lightning surge inducted by near field electromagnetic induction into DCS along the local signal cables,power cables and communication cables;
The model takes into account the fact that the meter incorporates other elements with a conducting surface in addition to the dipole antenna, viz.: a matching device, a signal cable, and a voltmeter.
Alternative forms of the measurement equation are obtained, which differ in the error associated with the currents induced by the measured electric field on the braid of the signal cable and on the casing of the voltmeter.
Based on existing control system,an on-line interlock system which prevents incorrectoperations at substatiOn. is presented in this paper. With the application of the real-timeinformation and rules,the system can not only generatc order lists,bul also replace thetraditional mimic board through prcvicwing and checking the operations on CRT of mastercomputer.The techniques of elcctronic key and code lock are also applied,which improves thecurrent switchgear interlock and provides the best protection against i...
According to the equality of the hydrostatic stress mean values on both sides of central horizontal plane of the die ,a pressure balance criterion for designing die cavity in the cable Al sheath CONFORM cladding is presented by means of the slab method.So the problem of designing die cavity in which metal flows uniformly is solved.Based on the criterion,a new type of 64 die chamber for producing the railway communication cable Al sheath is designed successfully.The maximum section area and diameter of th...
In this paper,combined with the Crosswise Broken Forecast of the Forceful Conveyer Belt Detection System,a practical method of transmitting digital image signals in asynchronous way with television cable is mainly proposed.The contents include the composition and decomposition of multiple signals,the coding and decoding,and the recognization of signals.Furthermore,the transmission experimental result is given in the end of the paper.