IEC 61823 pdf download – Electrical installations for lighting and beaconing of aerodromes – AGL series transformers

IEC 61823 pdf download – Electrical installations for lighting and beaconing of aerodromes – AGL series transformers
4 General requirements4.1classification
There are seven types of AGL series transformers specified in this standard,defined by theirnominal power, namely 30 w, 45 W,65 W,100 w,150 w, 200 W and 300 w.See Table 1 forthe required characteristics.
4.2Rated current
The rated primary and secondary currents shall be 6,6 A.
4.3Earthing
AGL series transformers may be provided with or without an earthing connection.
4.4AGL construction
The AGL series transformers shall have two electrically and physically separate windings, oneprimary and one secondary,wound on a magnetic core.The polarity of the windings shall besuch that the primary plug corresponds to the large socket of the secondary receptacle.
All internal electrical connections shall be permanent, e.g. by compression high-pressurecrimping, high-temperature soldering, welding, etc.
The shapes of the transformers are optional provided they meet all the requirements of thisstandard.Sharp edges shall be avoided.
The AGL series transformer including all connector leads shall be able to be inserted throughthe open end of a cylinder 20 cm in diameter by 25 cm long, and shal easily and totally fitinside such a cylinder.
The transformers shall be designed so that they may be installed and will perform to therequirements of this standard in any orientation.
The AGL series transformers shall be provided with two single-conductor primary leads anda two-conductor secondary lead.
4.4.1Primary connection leads
The AGL series transformers shall be connected to the AGL primary series circuit cable bytwo insulated，multi-stranded, copper conductors,with at least a 6 mm2 cross section,and alength measured from the transformer housing to the face of the connector of 6o * cm. Theservice voltage for the leads shall be 5 kV.One lead shall have a style 2 male plug at its end.The other lead shall have a style 9 female receptacle at its end.Unless otherwise agreedbetween the manufacturer and supplier,the connectors shall be provided with disposableshipping caps.
4.4.2Secondary connection lead
The secondary lead shall consist of two insulated, multi-stranded,copper conductors with anoverall jacket, each core of minimum cross section 2,5 mm2, minimum service voltage 60o v,and a length measured from the transformer housing to the face of the connector of120 *1cm. The lead shall have a type 2, class A, style 7 or style 8 female receptacle at itsend.Unless otherwise agreed between the manufacturer and supplier,the connector shall beprovided with a disposable shipping cap.
4.5Encapsulation
The AGL series transformer body, the connectors and the connection lead’s sheaths, shall bemade of compatible materials. The case shall be composed of material formed directly on thecore and coil assembly，or by compound filling a container. The transformer shall bepermanently encapsulated without cracks,holes, or internal voids as far as practical. Theencapsulation of the transformer must form a watertight casing，and must bond with itsconnection leads so as to provide a completely waterproof assembly.
The encapsulation material shall have a durometer hardness IRHD (Shore A) of not lessthan 55 as measured in accordance with the test method of lSO 48.
The minimum thickness of the encapsulation over the internal components shall be 6,5 mm atall points of the surface, for any type of encapsulant.
The encapsulation materials shall be capable of withstanding acid and alkaline soils,as wellas limited exposure to chemicals typically present on the aerodrome, including but not limitedto oil, gasoline，and de-icing fluids. The encapsulating materials must resist limited uvexposure. These characteristics may be confirmed by testing material samples (only).Thecharacteristics may be confirmed by tests sponsored by the transformer manufacturer, or bytest results supplied by the materials manufacturer.These results may be applied to all AGLseries transformers using the encapsulation material. lf a transformer manufacturer uses morethan one material for encapsulation, each such material shall meet these requirements.
4.6Earthing
The magnetic core shall not be connected to earth or to either of the primary or secondaryelectrical circuits.
AGL series transformers may be provided with or without an earthing connection. lf anearthing connection is provided, it shall be connected to that side of the secondary winding ofthe transformer which is connected to the larger socket of the secondary connector. Theearthing connection must have a water barrier within the transformer body.
4.7Service conditions
The ambient temperature range shall be -40 C to +55 °C.
AGL series transformers shall be suitable for continuous outdoor service when installed withinenclosures or by direct earth burial.
AGL series transformers shall be capable of operation when completely submerged in waterfor the life of the transformer.
4.8Electrical characteristics4.8.1 Secondary current
With the primary current lat 6,6 A, the secondary current lz shall be within ±1 % of theprimary current in the range between the low and high load in ohms given in Table 1.