Download PDF by Zarubin A.N.: A boundary value problem with an involutive shift in the

By Zarubin A.N.

Translated from Differentsialnye Uravneniya, Vol. forty, No. 10, 2004, pp. 1423-1425.

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CT taps can then be based on load and short-circuit considerations for the line without the use of auxiliary cts. 9 Current transformer location It is customary when using dead tank breakers to place cts on both sides of the contacts so that the protection zones will overlap. When live tank breakers are used, the cts are usually freestanding and located on only one side of the breaker. 110-1996 IEEE GUIDE FOR THE APPLICATION OF CURRENT TRANSFORMERS The availability of breaker failure protection can determine which side of the breaker is best for ct location.

If this voltage is less than the voltage setting of the relay, then the relay will not operate. For an internal fault, the cts attempt to force secondary current through the high-impedance differential relay and a relatively high voltage is developed to operate the overvoltage unit. 110-1996 IEEE GUIDE FOR THE APPLICATION OF CURRENT TRANSFORMERS located in the switchyard to minimize the voltage developed to the relay for an external fault and saturated ct. However, ct junction points at the relay location for convenience in cable routing or using existing cables have been successfully applied where the cable run is relatively short and ct and relay requirements are met.

In the case of bus faults, the currents should add up to the line current, which normally is much less than the fault current. If the cores are left with remanence magnetism in them, and the fault has a large dc component, the distance relays could be presented with large error currents. 4 Other types of high-speed protection The effects on these relay systems due to ct saturation can be most serious because of their operating speed, the conÞguration of ct sources, and the need for exactly the same performance at each location of the relaying systems.

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A boundary value problem with an involutive shift in the boundary condition by Zarubin A.N.


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