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.
Notes:
(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.