The following information must be known for the correct selection of current measurement transformer (measurement or protection):

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Annabelle Chandler
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1 P 5 Protetion trnsformers P.5.01 GB

2 Protetion trnsformers The following informtion must e known for the orret seletion of urrent mesurement trnsformer (mesurement or protetion): The pplition for whih it is intended (mesurement or protetion) Fetures of the operting environment, or onditions of use (indoors or outdoors, mximum operting temperture, et.) The fetures of the line where it is to e instlled: Size of les or fl t strip Mesurement mrgins for the mesured urrent (mximum nd minimum urrent) Overlod (rnge nd time) System voltge (low, medium or high voltge) Short iruit urrent System frequeny Seletion Fetures of the ssoited instrument or rely (ury, rted urrent, onsumption, et.) Distne etween the trnsformer nd the instrument, plus the le dimeter used for onnetion The of Trnsformer This is n importnt quntity. In the trnsformer, the primry urrent hs to indue power required in the seondry to trnsmit the seondry urrent to the mesurement equipment. Indued power hs to e equl to or higher thn losses in the line plus onsumption of the mesurement equipment itself. Losses in the line, P L : This is the power lost through heting up due to the pssge of urrent through the resistne R L in the les in the trnsformer s seondry iruit. Ftors to e tken into ount: Seondry urrent P L = R L I 2 Cle dimeter. R L is inversely proportionl to the squre of the dimeter Cle length. R L is proportionl to the length of ling (there nd k) ury power: The rted pprent power (), with speifi power ftor whih the urrent trnsformer supplies to the seondry urrent 2 with the ssigned urrent when it is onneted to its rted lod, S() = Z s I s ording to stndrds for pprent power higher thn or equl to 5, the power ftor is 0.8 indutive. For lower pprent powers the power ftor is the sme s the unit. For lower pprent powers the power ftor is the sme s the unit. ury of Trnsformer The type of error produed in trnsformer is estlished y IEC 441. In mesurement trnsformers 25 % nd 100% of rted power. In protetion trnsformers only 100 % of rted power. For Protetion Trnsformers Phse differene ± for % I n TYPE ± % Error for % I n Minutes Centirdins Composite error 5P ± 1 ± 60 ± 1,8 5 10P ± 3 10 P52

3 The Trnsformer when sturted urrent trnsformer is sturted when its urrent primry or lod re ove its rted vlues. The linerity of the urrent trnsformtion etween primry nd seondry dereses nd error inreses. s n e seen the sturtion of the trnsformer is inversely proportionl to the lod. (Fig. 1). The differene etween mesurement or protetion urrent trnsformers is its ehviour with the overlod whih ours in the primry. Those used for mesurement re sturted when there is n overlod in order not to dmge the equipment in the seondry. Protetion trnsformers re not sturted until there is high urrent. lss 5P15 protetion trnsformer indites tht it does not eome sturted until 15 times the rted urrent psses through the primry. (5 is the % of error in the mesured urrent) In mesurement trnsformers, the SFETY FCTOR (FS) prmeter indites how lrge the primry urrent n e whih the trnsformer is ple of trnsferring to mesuring equipment. Protetion trnsformers FIG. 1 Curve of 30 mesurement trnsformer CLSS CURVES B C % 0 1,2 5 x I pn 1 Current error 3 Mesurement trnsformer 0,5 10P5 5P5 Protetion trnsformer : Rted urrent re B: Overlod re for protetion trnsformers C: Mximum overlod re for FS < 5 mesurement trnsformers P53

4 TRM / TRP / TRMC Protetion trnsformers CIRCUTOR hs lrge rnge of urrent trnsformers mnuftured in resin. One of the dvntges tht this type of trnsformer hs, is tht it inreses the degree of strength (high mehnil resistne, high eletril rigidity, tropil wether resistnt, et.). lso, it mkes the mnipultion of the trnsformer ore impossile in this rnge. There re 3 types of enpsulted in resin trnsformers: TRM, TRP nd TRMC Trnsformers enpsulted in RESIN TRM: Trnsformers for mesurement TRP: Trnsformers for protetion TRMC: Trnsformers for power utility meters Trnsformer seletion tle ording to trnsformer rtio (I pn / I sn ) 5 000/ / / / / / /5 800/5 750/5 700/5 600/5 500/5 400/5 300/5 250/5 200/5 150/5 125/5 100/5 75/5 TRM 30 TRM 40 TRM 60 TRM 80 TRM 100 TRM 140 TRM 180 TRMC 210 TRMC 400 TRP 400 TRP 40 TRP 60 TRP 80 TRP 100 TRP 140 TRP 180 MESUREMENT PROTECTION TRM / TRP Series Enpsulted in resin P54

5 TRM Type TRM 30 TRM 40 TRM 60 Ø Inner Flt strip Busr Mesurement trnsformers Clss Clss Clss 0,5 1 0,5 0,5 75/5 2 P ,2 100/5 5 P ,1 150/5 5 P ,1 5 P ,3 200/5 10 P ,2 7,5 P ,3 250/5 15 P ,2 10 P ,2 5 P ,0 300/5 20 P ,3 15 P ,3 7,5 P ,2 400/5 25 P ,2 20 P ,3 10 P ,2 500/5 25 P ,2 15 P ,3 600/5 30 P ,2 20 P ,3 800/5 35 P ,3 25 P , /5 30 P , /5 35 P , Protetion trnsformers TRM 80 TRM 100 TRM 140 TRM 180 Ø Inner Flt strip Busr Clss Clss Clss Clss 0,5 0,5 0,5 0,5 500/5 5 P ,9 600/5 7,5 P ,9 750/5 10 P ,9 15 P , /5 15 P ,9 20 P ,7 15 P , /5 20 P ,7 20 P ,2 15 P , /5 20 P ,0 20 P ,6 25 P ,2 20 P , /5 25 P ,0 20 P ,7 30 P ,3 20 P , /5 30 P ,2 20 P ,8 35 P ,3 20 P , /5 25 P ,9 35 P ,5 20 P , /5 35 P ,0 20 P , /5 20 P , P55

6 Protetion trnsformers TRP Type TRP 40 TRP 60 Ø Inner Flt strip Busr P10 5P20 5P10 5P20 100/5 5 P ,0 P ,0 150/5 5 P ,0 P ,0 2,5 P ,6 P ,2 200/5 10 P ,0 P ,0 2,5 P ,7 P ,2 250/5 10 P ,0 P ,0 5 P ,7 P ,3 300/5 15 P ,1 P ,1 5 P ,7 P ,7 400/5 20 P ,1 P ,2 7,5 P ,8 P ,9 500/5 25 P ,2 P ,3 10 P ,8 P ,1 600/5 10 P ,9 P ,2 750/5 15 P ,0 P , /5 20 P ,2 P , Protetion trnsformers Type TRP 80 Type TRP 100 Ø Inner 80 Ø Inner 100 Flt strip Busr P10 5P20 5P10 5P20 100/5 750/5 5 P ,4 P ,6 200/ /5 7,5 P ,4 P ,8 250/5 5 P ,2 P , /5 10 P ,4 P ,9 300/5 5 P ,3 P , /5 10 P ,5 P ,1 400/5 7,5 P ,3 P , /5 15 P ,6 P ,2 500/5 10 P ,4 P , /5 15 P ,7 P ,4 600/5 10 P ,5 P , /5 15 P ,9 P ,8 800/5 15 P ,6 P , /5 20 P ,3 P , /5 20 P ,7 P , /5 25 P ,8 P , /5 30 P ,0 P , /5 30 P5033 4,1 P5023 7, /5 35 P5033B 4,2 P5023B 7, P56

7 Type TRP 140 TRP 180 Type TRP 400 Ø Inner Ø Inner 100 x 20 Flt strip TRP Busr P10 5P20 5P10 5P20 10 P10 5 P /5 5 P ,7 P ,2 750/5 7,5 P ,1 5 P , /5 800/5 7,5 P ,2 5 P , /5 5 P ,8 P , /5 10 P ,4 10 P , /5 10 P ,9 P ,6 5 P ,5 P , /5 10 P ,4 10 P , /5 10 P ,2 P ,1 7,5 P ,5 P , /5 15 P ,6 10 P , /5 10 P ,5 P ,5 10 P ,0 P , /5 20 P ,7 15 P , /5 15 P ,6 P ,0 10 P ,2 P , /5 15 P ,2 P ,9 15 P ,7 P , /5 15 P ,2 P ,6 Flt strip Protetion trnsformers Busr Protetion trnsformers TRMC210 TRMC400 Protetion nd mesurement trnsformers Type TRMC 210 TRMC 400 Ø Inner 100 x 20 flt strip Mesurement, fl t strip Busr Pwer Clss Clss ode 0,5S 0,5 0,5S 0,5 100/ Q ,6 150/ Q ,5 200/ Q ,5 300/ Q ,4 400/ Q ,41 500/ Q ,52 600/ Q ,67 750/ Q , / Q , / Q ,78 P57

8 Dimensions Protetion trnsformers (mm) d e f g h i j TRM TRM TRM TRP TRP (mm) d e f g h i j l m TRM TRM ,5 6,5 TRM TRP (mm) d e f g h i j k l m TRP TRP TRP TRP ,5 0,5 TRP 400 TRMC 400 TRMC 210 Dimensions Up to P58

M.7 CONTENTS. Measurement transformers and shunts. Introduction Page 3 TC 5 TC 5,2 TC 6,2 TC 6 TC 8 TC 10 TC 12. Slim line current transformers Page 7

M.7 CONTENTS. Measurement transformers and shunts. Introduction Page 3 TC 5 TC 5,2 TC 6,2 TC 6 TC 8 TC 10 TC 12. Slim line current transformers Page 7 Current transformers and shunts M7 M.7.01 GB CONTENTS Introdution Page 3 TC TCH T TC 5 TC 5,2 TC 6,2 TC 6 TC 8 TC 10 TC 12 TCH 6,2 TCH 6 TCH 8 TCH 10 TCH 12 T 400 T 0 T 600 Slim line urrent transformers