With the progress of science and technology, electric interlocking systems are being replaced by computer based interlocking systems. In this paper, some improvements of interlock functions and design idea of interlocking software in computer based interlocking system are discussed.
The proposed signal power uses two independent power supply of 220 V which can be switched either manually or automatically with the master supply has higher priority. The signal power can work with both undervoltage and overvoltage driven protection and the capability of mechanism and electric interlocking.
To counter the shortcomings of the former electric interlock control circuit of PTA transfer blower system, the first trouble (circuit open) discriminator has been designed and applied. So that the trouble location become prompt and accurate.
kV Hengli Substation in Guangdong power grid is the first substation in China applying imported 500 kV hybrid gas insulation switchgear(HGIS),which is equipped with not only reliable mechanical interlock but also electric interlock for all of its circuit breakers,disconnectors, earthing switches, etc. The blocking logic of the secondary equipment connected with HGIS,however,should be improved in design.
This paper deals with increasing the availability and automatic control level of 385m2 kelly filter further by utilizing PLC control technology, associating with the characteristic of PLC technology and the electrical interlocking property of 385 m2 kelly filter, under the condition of operation practice。
This paper deals with increasing the availability and automatic control level of 385m 2 kelly filter further by utilizing PLC control technology,associating with the characteristic of PLC technology and the electrical interlocking property of 385 m 2 kelly filter, under the condition of operation practice 。
The article discusses several methods of electrical interlocking protection and relevant facilities that are adopted to prevent equipment from hitching and bumping damages when the carbon stacking crane takes and loads carbon blocks from floor conveyors,and makes comparison among these methods and facilities while recommending the optimum solutions.