Division 1.1 Requirements for three-phase medium power transformers with rated power ≤ 3 150 kVA

United Kingdom

Table I.1: F1Maximum load and no-load losses (in W) for three-phase liquid-immersed medium power transformers with one winding with U _m ≤ 24kV and the other with U _m ≤ 3,6 kV

	Tier 1 (from 1 July 2015)		Tier 2 (from 1 July 2021)
Maximum losses for kVA ratings that fall in between the ratings given in Table I.1 shall be obtained by linear interpolation.
Rated Power (kVA)	Maximum load losses P_k (W)^f1	Maximum no-load losses P_o (W)	Maximum load losses P_k (W)	Maximum no-load losses P_o (W)
≤ 25	C_k (900)	A_o (70)	A_k (600)	A_o – 10 % (63)
50	C_k (1 100)	A_o (90)	A_k (750)	A_o – 10 % (81)
100	C_k (1 750)	A_o (145)	A_k (1 250)	A_o – 10 % (130)
160	C_k (2 350)	A_o (210)	A_k (1 750)	A_o – 10 % (189)
250	C_k (3 250)	A_o (300)	A_k (2 350)	A_o – 10 % (270)
315	C_k (3 900)	A_o (360)	A_k (2 800)	A_o – 10 % (324)
400	C_k (4 600)	A_o (430)	A_k (3 250)	A_o – 10 % (387)
500	C_k (5 500)	A_o (510)	A_k (3 900)	A_o – 10 % (459)
630	C_k (6 500)	A_o (600)	A_k (4 600)	A_o – 10 % (540)
800	C_k (8 400)	A_o (650)	A_k (6 000)	A_o – 10 % (585)
1 000	C_k (10 500)	A_o (770)	A_k (7 600)	A_o – 10 % (693)
1 250	B_k (11 000)	A_o (950)	A_k (9 500)	A_o – 10 % (855)
1 600	B_k (14 000)	A_o (1 200)	A_k (12 000)	A_o – 10 % (1 080)
2 000	B_k (18 000)	A_o (1 450)	A_k (15 000)	A_o – 10 % (1 305)
2 500	B_k (22 000)	A_o (1 750)	A_k (18 500)	A_o – 10 % (1 575)
3 150	B_k (27 500)	A_o (2 200)	A_k (23 000)	A_o – 10 % (1 980)

Table I.2: Maximum load and no-load losses (in W) for three-phase dry-type medium power transformers with one winding with Um ≤ 24kV and the other with Um ≤ 3,6 kV

	Tier 1 (1 July 2015)		Tier 2 (1 July 2021)
Maximum losses for kVA ratings that fall in between the ratings given in Table I.2 shall be obtained by linear interpolation.
Rated Power (kVA)	Maximum load losses P_k (W)^f2	Maximum no-load losses P_o (W)	Maximum load losses P_k (W)	Maximum no-load losses P_o (W)
≤ 50	B_k (1 700)	A_o (200)	A_k (1 500)	A_o – 10 % (180)
100	B_k (2 050)	A_o (280)	A_k (1 800)	A_o – 10 % (252)
160	B_k (2 900)	A_o (400)	A_k (2 600)	A_o – 10 % (360)
250	B_k (3 800)	A_o (520)	A_k (3 400)	A_o – 10 % (468)
400	B_k (5 500)	A_o (750)	A_k (4 500)	A_o – 10 % (675)
630	B_k (7 600)	A_o (1 100)	A_k (7 100)	A_o – 10 % (990)
800	A_k (8 000)	A_o (1 300)	A_k (8 000)	A_o – 10 % (1 170)
1 000	A_k (9 000)	A_o (1 550)	A_k (9 000)	A_o – 10 % (1 395)
1 250	A_k (11 000)	A_o (1 800)	A_k (11 000)	A_o – 10 % (1 620)
1 600	A_k (13 000)	A_o (2 200)	A_k (13 000)	A_o – 10 % (1 980)
2 000	A_k (16 000)	A_o (2 600)	A_k (16 000)	A_o – 10 % (2 340)
2 500	A_k (19 000)	A_o (3 100)	A_k (19 000)	A_o – 10 % (2 790)
3 150	A_k (22 000)	A_o (3 800)	A_k (22 000)	A_o – 10 % (3 420)

Table I.3a

Correction factors to be applied to the load and no load losses indicated in Tables I.1, I.2 and I.6 for medium power transformers with special combinations of winding voltages (for rated power ≤ 3 150 kVA)

Special combination of voltages in one winding		Load losses (P _k )	No load losses (P _o )
For both liquid immersed (Table I.1) and dry type (Table I.2)		No correction	No correction
Primary highest voltage for equipment U _m ≤ 24kV	Secondary highest voltage for equipment U _m > 3,6 kV	No correction	No correction
For liquid immersed (Table I.1)		10 %	15 %
Primary highest voltage for equipment Um = 36kV	Secondary highest voltage for equipment Um ≤ 3,6 kV	10 %	15 %
Primary highest voltage for equipment Um = 36kV	Secondary highest voltage for equipment Um > 3,6 kV	10 %	15 %
For dry type (Table I.2)		10 %	15 %
Primary highest voltage for equipment Um = 36kV	Secondary highest voltage for equipment Um ≤ 3,6 kV	10 %	15 %
Primary highest voltage for equipment Um = 36kV	Secondary highest voltage for equipment Um > 3,6 kV	15 %	20 %

Table I.3b

Correction factors to be applied to the load and no load losses indicated in Tables I.1, I.2 and I.6 for medium power transformers with dual voltage in one or both windings differing more than 10 % and rated power ≤ 3 150 kVA.

Type of dual voltage	Reference voltage for the application of correction factors	Load losses (Pk) ^f3	No load losses (Po)
The losses shall be calculated on the base of the voltage of the winding specified in the second column and can be increased with the correction factors given in the last 2 columns. In any case, whatever the combinations of winding voltages, the losses cannot exceed the values given in Tables I.1, I.2 and I.6 corrected by the factors in this table.
Dual voltage on one winding with reduced power output on the lower low-voltage winding AND maximum available power on the lower voltage of the low-voltage winding limited to 0,85 of the rated power assigned to the low-voltage winding at its higher voltage.	losses shall be calculated based on the higher voltage of the low-voltage winding	No correction	No correction
Dual voltage on one winding with reduced power output on the lower high-voltage winding AND maximum available power on the lower voltage of the high-voltage winding limited to 0,85 of the rated power assigned to the high-voltage winding at its higher voltage.	losses shall be calculated based on the higher voltage of the high-voltage winding	No correction	No correction
Dual voltage on one winding AND full rated power available on both windings, i.e., the full nominal power is available regardless of the combination of voltages.	The losses shall be calculated based on the higher voltage of the dual voltage winding	10 %	15 %
Dual voltage on both windings AND rated power available on all combinations of windings, i.e., both voltages on one winding are fully rated in combination with one of the voltages on the other winding	the losses shall be calculated based on the higher voltages of both dual voltage windings	20 %	20 %

Annotations

Textual amendments

F1: Substituted by Commission Regulation (EU) 2019/1783 of 1 October 2019 amending Regulation (EU) No 548/2014 on implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to small, medium and large power transformers (Text with EEA relevance).

Footnotes

f1: Maximum losses for kVA ratings that fall in between the ratings given in Table I.1 shall be obtained by linear interpolation.
f2: Maximum losses for kVA ratings that fall in between the ratings given in Table I.2 shall be obtained by linear interpolation.
f3: The losses shall be calculated on the base of the voltage of the winding specified in the second column and can be increased with the correction factors given in the last 2 columns. In any case, whatever the combinations of winding voltages, the losses cannot exceed the values given in Tables I.1, I.2 and I.6 corrected by the factors in this table.

Notes on Division 1

Textual amendments

F1: Inserted by Commission Regulation (EU) 2019/1783 of 1 October 2019 amending Regulation (EU) No 548/2014 on implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to small, medium and large power transformers (Text with EEA relevance).

Footnotes

f1

The European Commission Better Regulation Toolbox suggest using a value of 4 % for the social discount rate

https://ec.europa.eu/info/sites/info/files/file_import/better-regulation-toolbox-61_en_0.pdf