3-Colorable Even Embeddings on Closed Surfaces by Nakamoto A., Sasanuma N.

By Nakamoto A., Sasanuma N.

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Sample text

The fault current duration can be much shorter than the time constant of the primary circuit. The result is a remanent ßux in the ct core that can only be removed by demagnetization. It will not be affected by normal load current. 110-1996 Annex D Bibliography (Informative) This listing of books, articles, and standards is provided as sources for additional information. 2-1991, Conformance Test Procedures for Instrument Transformers. [B2] Blackburn, J. , "Ground Relay Polarization," AIEE Transactions, vol.

How closely should the knee-point voltages be matched? Consider the application shown in the schematic of Þgure 14 with a set of generator terminal-side cts having a 500 V knee-point voltage and a set of neutral-side cts having a 552 V knee-point voltage. The knee-point voltage is generally 46% of the excitation voltage occurring at 10 A of excitation. 46 = 1200 V, respectively. Figure 15 shows the response of these cts for a 58 800 A fault with maximum offset due to an X/R ratio of 52. In this case, the ct at the generator terminal saturates slightlybefore the ct on the generator neutral.

Connections between the compensation windings on a ct are made internally by the manufacturer. No connections are brought out from the compensation windings so application of these cts needs no additional consideration. 6 Generator differential relay application It is impractical to size cts to avoid transient saturation in a generator differential because of the high X/R ratios encountered. The rule is to select the largest practical rating and match the terminal and neutral-side cts. 110-1996 IEEE GUIDE FOR THE APPLICATION OF CURRENT TRANSFORMERS that the highest ct accuracy class is the C800 and that any ct with an excitation voltage exceeding 800 V is classiÞed C800 no matter how high the voltage.

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