Question

Discuss the sources of error in current and voltage transformers and the potential consequences of these errors for protection systems. Also mention the effects of CT saturation on protection systems.

Answer 1

magnettic deakage magnetic flux density in the Core e not a ineas f magnetizing Function fos ce Reduction f essos \n CT To reduce the esTor in CT adow seductan ce high Permeabidity cose ig Preferred for e that material ured CRG.O., Sii con steel Chod osled) NI-TTon Alloy To educe te magnetic eakage seduce the ditance blo psimary Secondasy 64 uAing Fessite CoTe we can reduce both satio 4 Phare angle exor Tusns compempation byseducing Se condavy side he satio exor but it doemt have any we can minimize 9 tusn on e ffe ct on phafe angle essos Potential kmer Potential tsamsfor mes > are used fo high Votage dines. Ratio ersor in Potentia X-mer The difference b/o the ideas Value Ve and actuas Value V ic he N tage erDY Or Satio etyor . Voltage esror

Phase essos 6 Phate angse eso im PT The angle p between the psimary syetem Voltage Ve asnd the reves se d se CondaTy Nadtage Nectore KrVs Phace esror Cause of eso n PT The Nostage appuied to the Psimaty of PT. Fixpt dsopf mpedance due to the intermal f the Primaty. Then it acrore the Psimasy inding appeass and ren tfanefoimed Psofastionally tre fecomdary to its tusng sati0, to winding hi ansfor med Voltage the secondaty inding will again drap due to internal impedance of second asy betoe apfeasing acsose acrofs busd en tesmimale. Satusasion of CT Coret Practically matwo are exactiy dentical Their CT atio may be game but &atusad on devede ave Tn addition to thie atio esror CT diffesent and Phase faudt exoor Pssduces differ ent CT Primary currente g&condary curent fosthe fame Due to this reason in case of hoough taut L abroimally nigh eaurer the CT Salio to ehange, Auch ka Eka & day ofesates faudt on the eneratos wind ing a). are equal & even tnough heae mo

cursent tramsfosmer TIt is ueed fox measure ment af cumrent ETTRSTT CTH Cuppyy Load The two types of winding occusing in a Winding CT ase: CT D Ratio Eros The e xact Primars to e condasy cuent satio of a CT is not efual to the turme ratio f CT due to the mo-i0ad COmpOnent af current (T)This Caupes the esoyin hi ch C adledsatio essos". CT Actuas atio Na minas atio o/o Ratio KAOO Actual Tatia mo-doad depend on in CT e so Ratio current Phase angle esos (e) he angle b hich the secondasy cursent Phafor tohen Tevesse differs in Phase fsom the psimary custen Phase angle esTos (a) ip called phase angle essor also depende on cusrent of CT. the mo oad OF essos in C-T.プ Causes losses in the X-mes COre of in windina Of X-mer.