A transformer for the measurement of current in high-voltage supply networks

(19)

(11)

EP 0 746 002 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	12.03.1997 Bulletin 1997/11

(43)	Date of publication A2:
	04.12.1996 Bulletin 1996/49

(21)	Application number: 96108463.9

(22)	Date of filing: 28.05.1996

(51)	International Patent Classification (IPC)⁶: H01F 38/30

(84)	Designated Contracting States:
	BE CH DE ES FR GB IT LI SE

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Priority:

01.06.1995 IT MI951143

(71)	Applicant: PASSONI E VILLA FABBRICA ISOLATORI E CONDENSATORI S.p.A.
	20162 Milan (IT)

(72)	Inventors:
	Villa, Giorgio 20124 Milan (IT) Villa, Giancarlo 20124 Milan (IT)

(74)	Representative: Klausner, Erich et al
	c/o Ufficio Internazionale Brevetti Ing. C. Gregorj S.p.A. Via Dogana 1 20123 Milano 20123 Milano (IT)

(54)	A transformer for the measurement of current in high-voltage supply networks

(57) The invention concerns a transformer for the measurement of current in high-voltage networks wherein the shell (7), which compacts in the form of a ring the magnetic cores (6) of the secondary winding, is fixed in its lower part to a central metal tube (20) at the base of the transformer and in its upper part to an insulating tube (22) which centers and keeps taut said elements (22, 7, 20) resulting in advantages both with respect to the construction and for transporation. There are also provided electrodes (28,29) facing one another in order to form a preferential discharge zone in the vicinity of the safety membrane (14) as well as an intermediate shield (36) surrounding the central tube (20) and possibly, in the case of high voltages, a capacitance grading bushing (45) wound around the intermediate shield (36) for a better distribution of the electrical field.

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