AS 61869.1:2021 Instrument transformers Part 1: General requirements (IEC 61869-1:2007 (ED.1.0) MOD).
AS 61869.1 is applicable to newly manufactured instrument transformers with analogue or digital output for use with electrical measuring instruments or electrical protective devices having rated frequencies from 15 Hz to 100 Hz.
This standard is a product family standard and covers general requirements only. For each kind of instrument transformer the product standard is composed by this standard and the relevant specific standard.
2 Normative references
The following referenced documents are essential for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60060-1: High-voltage test techniques — Part 1: General definitions and test requirements
IEC 60068-2-1 1: Basic environmental testing procedures — Part 2: Tests — Test Ka: Salt mist
IEC 60068-2-17: Basic environmental testing procedures — Part 2: Tests – Test Q: Sealing
IEC 60068-2-75: Environmental testing — Part 2-75: Tests — Test Eh: Hammer tests.
IEC 60071-1: Insulation co-ordination — Part 1: Definitions, principles and rules
IEC 60085: Electrical insulation — Thermal classification
IEC 60270: High-voltage test techniques — Partial discharge measurements
IEC 60296: Fluids for electrotechnical applications — Unused mineral insulating oils for transformers and switch gear
IEC 60376: Specification of technical grade sulfur hexa fluoride (SF5) for use in electrical equipment
IEC 60417: Graphical symbols for use on equipment
IEC 60455 (all parts): Resin based reactive compounds used for electrical insulation
IEC 60480: Guidelines for the checking and treatment of sulphur hexa fluoride (SF6) taken from electrical equipment and specification for its re-use
IEC 60529: Degrees of protection provided by enclosures (IP code)
IEC 60567: Oil-filled electrical equipment — Sampling of gases and of oil for analysis of free and dissolved gases — Guidance
3.1 General definitions
instrument transformer
transformer intended to transmit an information signal to measuring instruments, meters and protective or control devices or similar apparatus
[1EV 321-01-01, modified]
housing affording the type and degree of protection suitable for the intended application
[1EV 826-12-20]
primary terminals
terminals to which the voltage or current to be transformed is applied
secondary terminals
terminals which transmit an information signal to measuring instruments, meters and protective or control devices or similar apparatus
secondary circuit
the external circuit receiving the information signals supplied by the secondary terminals of an instrument transformer
[1EV 321-01-08, modified]
electrically conductive part of an instrument transformer insulated from other similar parts and equipped with terminals
3.2 Definitions related to dielectric ratings
highest voltage of a system (Usys)
highest value of the phase-to-phase operating voltage (r.m.s. value) which occurs under normal operating conditions at any time and at any point in the system.AS 61869.1 pdf download.