IEC 60044-7:1999 pdf download – Instrument transformers一 Part 7: Electronic voltage transformers

IEC 60044-7:1999 pdf download – Instrument transformers一 Part 7: Electronic voltage transformers.
This part of International Standard lEG 60044 applies to newly manufactured electronic voltage transformers with analogue output, for use with electrical measuring instruments and electrical protective devices at frequencies from 15 Hz to 100 Hz.
NOTE I Optical arrangements usually include electronic components and are therefore considered to be within the application of this standard.
NOTE 2 Detailed information is given in annex B.
NOTE 3 Requirements specific to three-phase voltage transformers are not included in this standard but, so far as they are relevant, the requirements in clauses 3 to 11 apply to these transformers and a few references to them are included in Ihose clauses (e.g. see 2.1.5, 5.1.1. 5.2.11.2.1 and 11.2.2).
1.2 NormatIve reterences
The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 60044. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of lEG 60044 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IEC and ISO maintain registers of currently valid International Standards.
IEC 60038:1983, IEC standard voltages
lEG 60044-2:1997. Instrument transformers — Part 2: Inductive voltage transformers
I EC 60050(161): 1990, International Elect rotechnical Vocabulary (1EV) — Chapter 161:
Electromagnetic compatibility
IEC 60050(321 ):1 986, International Electrotechnical Vocabulary (1EV) — Chapter 321:
Instrument transformers
IEC 60050(60 1 ):1 985, International Electrotechnical Vocabulary (1EV) — Chapter 601:
Generation, transmission and distribution of electricity — General
IEC 60050(604):1 987, International Electrotechnical Vocabulary (1EV) — Chapter 604:
Generation, transmission and distribution of electricity — Operation
IEC 60060 (all parts), High-voltage techniques
lEG 60060-1:1989, High-voltage test techniques — Part 1: General definitions and test requirements
IEC 60071-1:1993, Insulation co-ordination — Part 1: Definitions, principles and rules
2 Definitions
For the purpose of this part of IEC 60044, the following definitions apply.
2.1 General definitions
2.1.1
electronic instrument transformer
an arrangement consisting of one or more current or voltage sensors which may be connected to a transmitting system and a secondary converter, all intended to transmit a measuring quantity in a proportional quantity to supply measuring instruments, meters and protective or control devices
2.1.2
electronic voltage transformer
an electronic instrument transformer in which the secondary voltage in normal conditions of use is substantially proportional to the primary voltage and differs in phase from it by an angle which is approximately zero for an appropriate direction of the connections
2.1.3
electronic measuring voltage transformer
an electronic voltage transformer intended to transmit an information signal to measuring instruments and meters
2.1.4
unearthed electronic voltage transformer
an electronic voltage transformer in which all parts of the primary voltage sensor, including terminals, are insulated from earth to a level corresponding to its rated insulation level
2.1.5
earthed electronic voltage transformer
a single-phase electronic voltage transformer intended to have one primary voltage terminal directly earthed, or a three-phase electronic voltage transformer intended to have the primary star-point directly earthed
2.1.6
secondary circuit
the external circuit receiving the information signals supplied by the secondary converter of an electronic voltage transformer (1EV 321-01-08 modifiedj
2.1.7
rated primary voltage (U)
the r.m.s. value of the component at frequency f, of the primary voltage on which the performance of an electronic voltage transformer is based [1EV 321-01-12 modified]
NOTE See clause B2.
2.1.8
rated secondary voltage (U)
the r.m.s. value of the component at frequency f of the secondary voltage on which the performance of an electronic voltage transformer is based [1EV 321-01-16 modified]
NOTE See clause B2.