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CSA C802.2-12 pdf free download

CSA C802.2-12 pdf free download.Minimum efficiency values for dry-type transformers.
Cost of no-load loss — the present value of no-load loss, or no-load loss multiplied by the coefficient of no-load loss as employed in a loss evaluation formula.
Note: The coefficient may also be described as the equivalent first -cost factor of no-load loss.
Drive (isolation) transformer — a transformer that
(a) isolates an electric motor from the line;
(b) accommodates the added loads of drive-created harmonics; and
(C) is designed to withstand the additional mechanical stresses resulting from an ac adjustable frequency motor drive or a dc motor drive.
Dry-type transformer — a transformer, including a transformer that is incorporated into another product, in which the core and coils are in a gaseous or dry-compound insulating medium and that
(a) is single phase and has a capacity of 15 to 833 kVA or three phase and has a capacity of 15 to 7500 kVA;
(b) has a nominal frequency of 60 Hz;
(c) has a rated low-voltage line current of less than 4000 A; and
(d) has a maximum Rh of 30 kV for a low-voltage winding.
Note: The efficiencies of the transformers listed in Clause 1.5 ore not covered by the requirements of this Standard.
Efficiency — the value calculated based on the specified losses of the transformer. Efficiency is expressed
as a percentage and is rounded to two decimal places.
(1) The efficiency value is derived from the parameters of output kVA. divided by output WA plus losses, and multiplied by 100. It may be expressed at a given per unit load and or a specified reference temperature.
(2) The acceptable efficiency range of a transformer when its no-load and total losses ore within the single unit tolerances defined in CSA C9 is known as the efficiency toIerance’.
Encapsulated (sand-resin potted) transformer a transformer designed to have the core and coils encapsulated in a solid medium.
Note: Cost coil transformers are not considered encapsulated transformers.
Furnace transformer — a three-phase step-down transformer that is designed to be connected to an electric-arc furnace and has a high-voltage delta-wye switching arrangement and high-voltage taps for changing the level of the low voltage supplied to the furnace.
Grounding transformer — a three-phase transformer intended to provide a neutral point for system
grounding purposes, by
(a) a wye primary winding with a neutral connected to ground and a delta secondary winding; or
(b) a transformer with its primary winding in a zigzag winding arrangement, and no secondary winding.
Nonventilated transformer — a transformer constructed to prevent external air circulation through the coils of the transformer while operating at zero gauge pressure.
On-load regulating transformer — a transformer that
(a) varies the voltage, phase angle, or both of an output circuit controlling the output within specified limits;CSA C802.2-12 pdf free download.

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