IEEE C37.101-1985 pdf free

04-27-2021 comment

IEEE C37.101-1985 pdf free.IEEE Guide for Generator Ground Protection.
Those boxes which are crossed out and con-tain no protection scheme numbers representcases that are either not practical or not recom-mended. Forexample,under column D,adelta-connected generator has no neutral avail-able, so boxes under column D (associated withrows I,II, III,IV, and V) are crossed out.Also,the box under column E(and associated withrow v) is crossed out because the use of atuned-resonantgrounding method, in theneutral of a wye-connected generator directlyconnected to a grounded system, is a misappli-cation.
The protective scheme numbers in the boxesrefer to protective schemes that are completelyillustrated and described in Section 6 of thisguide. In some boxes, there are some numbersthat are followed by the suffix s, such as 5sin box (D-VI).The suffix S indicates that theprotective scheme represented by that schemenumber designation is suitable for use onlywhen the machine is running and disconnectedfrom the system,but with field excitationapplied. This type of protection utilizes protec-tive devices that are not tuned to normal systemfrequency, so that they offer sensitive protection over a wide range of frequencies.Thus,schemes designated with the suffix S are suit-able for the protection of machines duringstartup and shutdown. Protective scheme numbers without the suffix S represent schemesthat are indexed to provide protection onlyduringoperation atrated frequency. For example,in the case of the generator connec-tion illustrated in the diagram of column Awith the grounding connection of row I,scheme 8s is intended to detect any singlephase-to-ground fault in the generator or itsleads during startup or shutdown procedureswhile field excitation is applied,but with themain circuit breaker open. In the box (D-VIII) the protective scheme represented byscheme 17 is intended for protection duringthe time that the main breaker is closed andthe machine is running normally. In general,startup and shutdown proctection for singlephase-to-ground faults is indicated only inthose applications where a highimpedancegrounded or an ungrounded generator is connected directly to a grounded system, or whereexcitation is applied to a machine early in thestartup cycle or is removed late in the shut-down cycle.This startup and shutdown protection is generally not intended to coordinateproperly with system protection. For thisreason,it should be removed from service atthe time the unit is synchronized to the system.This is usually performed automatically whenthe main breaker is closed.
The protective scheme numbers in Table 1are arranged in the boxes with the running protective schemes listed first,and the startupprotective schemes—where they apply—listedlast. Within each box, the schemes within thebrackets are the most widely used and recommended. The remainder of the schemes arelisted in numerical sequence.IEEE C37.101 pdf download.

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