By Klaus Ragaller
Shortly after the institution of the Brown Boveri study middle in 1967, plans have been built to prepare a sequence of Brown Boveri clinical Symposia, each one hav ing a special subject, to be held some other yr in Baden. we elect the topic for a symposium with the next standards in brain: it may represent part of a systematic self-discipline; in different phrases it's going to trouble a space of scholarly learn and learn. it may be of present curiosity within the experience that vital effects have fresh ly been got and massive examine is less than \\dY within the world's medical neighborhood. it's going to endure a few relation to the medical and technological task of the corporate. those symposia are in detail on the topic of one of many very easy suggestions that have ruled the paintings of many smooth production businesses: shut coupling be tween technology and engineering. it really is to this coupling that we owe the technical stan dard of our items, and it really is this coupling which we are hoping to be furthered through our symposia.
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REICHERT 22 also play a relatively important role. Although these relationships have not yet been investigated in detail, the qualitative apsects of the limiting curves have been determined empirically. Figure 19 shows such a dielectric limiting curve on a double logarithmic scale. The peak voltage, which can just be maintained, is plotted against the current. The typical curve is relatively flat at low current levels and drops off at higher currents. Below the limiting curve the breaker switches successfully, but fails above it.
In the case of SF 6 -circuit breakers, significant interaction takes place only in the itrv-region. An example of such calculations will be presented in the paper by Hermann and Ragaller. As shown in Section 2. 2, after circuit breaking in the case of a short-line fault, the network supplies a recovery voltage at a rate proportional to the current. This relationship is shown in Fig. 16. The point of intersection of this line for the network and the limiting curve for the circuit breaker determines the critical current which can be broken by the breaker in a particular network.
Hertz become even more important. K. Ragaller You're right. The circuit-breaker engineer has several degress of freedom in designing a circuit breaker. The point I want to make is that there exist basic physical limits which lead to very general statements about limiting curves and their dependence upon current and voltage. A real circuit breaker deviates from these basic limits to the extent that the designer was unsuccessful in avoiding such negative effects as metal vapor. TRANSIENT RECOVERY VOLTAGE IN THE SHORT LINE FAULT REGIME N.
Current Interruption in High-Voltage Networks by Klaus Ragaller