Licensed Copy: :FULLNAME, : DATE, Uncontrolled Copy, (c) BSI
BRITISH STANDARD
Three-phase oil-immersed distribution transformers 50 Hz, from 50 kVA to 2 500 kVA with highest voltage for equipment not exceeding 36 kV — Part 1: General requirements
The European Standard EN 50464-1:2007 has the status of a British Standard
ICS 29.180
12&23<,1*:,7+287%6,3(50,66,21(;&(37$63(50,77('%<&23<5,*+7/$:
BS EN 50464-1:2007
BS EN 50464-1:2007
National foreword This British Standard is the UK implementation of EN 50464-1:2007. It supersedes BS 7821-1:1995 and BS 7821-3:1995, which are withdrawn. The UK participation in its preparation was entrusted to Technical Committee PEL/14, Power transformers. A list of organizations represented on this committee can be obtained on request to its secretary.
Licensed Copy: :FULLNAME, : DATE, Uncontrolled Copy, (c) BSI
This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations.
This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2007
© BSI 2007
ISBN 978 0 580 57448 1
Amendments issued since publication Amd. No.
Date
Comments
EUROPEAN STANDARD
EN 50464-1
NORME EUROPÉENNE April 2007
EUROPÄISCHE NORM ICS 29.180
Supersedes HD 428.1 S1:1992 + A1:1995 and HD 428.3 S1:1994
Licensed Copy: :FULLNAME, : DATE, Uncontrolled Copy, (c) BSI
English version
Three-phase oil-immersed distribution transformers 50 Hz, from 50 kVA to 2 500 kVA with highest voltage for equipment not exceeding 36 kV Part 1: General requirements
Transformateurs triphasés de distribution immergés dans l'huile, 50 Hz, de 50 kVA à 2 500 kVA, de tension la plus élevée pour le matériel ne dépassant pas 36 kV Partie 1: Prescriptions générales
Ölgefüllte Drehstrom-Verteilungstransformatoren 50 Hz, 50 kVA bis 2 500 kVA, mit einer höchsten Spannung für Betriebsmittel bis 36 kV Teil 1: Allgemeine Anforderungen
This European Standard was approved by CENELEC on 2006-12-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels © 2007 CENELEC -
All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50464-1:2007 E
EN 50464-1:2007
-2-
Foreword This European Standard, prepared by the Technical Committee CENELEC TC 14, Power transformers was submitted to the formal vote and was approved by CENELEC as EN 50464-1 on 2006-12-01. This European Standard supersedes HD 428.1 S1:1992 + A1:1995 and HD 428.3 S1:1994.
Licensed Copy: :FULLNAME, : DATE, Uncontrolled Copy, (c) BSI
The following dates were fixed: –
–
latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement
(dop)
2007-12-01
latest date by which the national standards conflicting with the EN have to be withdrawn
(dow)
2011-12-01
The EN 50464 series consists of the following parts, under the general title “Three-phase oil-immersed distribution transformers 50 Hz, from 50 kVA to 2 500 kVA with highest voltage for equipment not exceeding 36 kV”: Part 1
General requirements
Part 2-1
Distribution transformers with cable boxes on the high-voltage and/or low-voltage side – General requirements
Part 2-2
Distribution transformers with cable boxes on the high-voltage and/or low-voltage side – Cable boxes type 1 for use on distribution transformers meeting the requirements of EN 50464-2-1
Part 2-3
Distribution transformers with cable boxes on the high-voltage and/or low-voltage side – Cable boxes type 2 for use on distribution transformers meeting the requirements of EN 50464-2-1
Part 3
Determination of the power rating of a transformer loaded with non-sinusoidal currents
Part 4
Requirements and tests concerning pressurised corrugated tanks __________
-3-
EN 50464-1:2007
Licensed Copy: :FULLNAME, : DATE, Uncontrolled Copy, (c) BSI
Contents 1
Scope .............................................................................................................................. 4
2
Normative references ....................................................................................................... 4
3
Electrical characteristics ................................................................................................... 4
4
3.1 Rated power............................................................................................................ 4 3.2 Highest voltages for equipment for windings ............................................................. 5 3.3 Rated voltages of windings ...................................................................................... 5 3.4 Tapping .................................................................................................................. 5 3.5 Connections ............................................................................................................ 5 3.6 Dimensioning of neutral connection of the low-voltage winding .................................. 6 3.7 Short-circuit impedance ........................................................................................... 6 3.8 Losses and sound power level.................................................................................. 6 3.9 Tolerances and penalties ....................................................................................... 10 3.10 Tests .................................................................................................................... 10 3.11 Insulation levels and dielectric tests ....................................................................... 10 Design requirements ...................................................................................................... 10
5
4.1 Type of oil preservation system and degree of sealing ............................................. 4.2 Terminal markings ................................................................................................. 4.3 Terminations ......................................................................................................... 4.4 Distance between bushings.................................................................................... 4.5 Rollers .................................................................................................................. Accessories ...................................................................................................................
6
Efficiency and voltage drop (at reference temperature) ..................................................... 12
10 10 10 11 11 11
6.1 Efficiency .............................................................................................................. 12 6.2 Voltage drop ( u%) ............................................................................................... 13 Annex A (informative) Capitalisation evaluation..................................................................... 14 Bibliography ......................................................................................................................... 15 Tables Table 1 – Connections for distribution transformers .................................................................. 5 Table 2 – Load losses P k (W) at 75 °C for U m
24 kV ............................................................... 7
Table 3 – No load losses P 0 (W) and sound power level (Lw (A) ) for U m
24 kV ........................... 8
Table 4 – Load losses P k36 (W) at 75 °C for U m = 36 kV ............................................................ 9 Table 5 – No load losses P 036 (W) and sound power level (Lw (A) ) for U m = 36 kV ....................... 9 Table 6 – Accessories .......................................................................................................... 12
EN 50464-1:2007
1
-4-
Scope
Licensed Copy: :FULLNAME, : DATE, Uncontrolled Copy, (c) BSI
This document covers transformers from 50 kVA to 2 500 kVA intended for operation in three-phase distribution networks, for indoor or outdoor continuous service, 50 Hz, immersed in mineral oil, natural cooling, with two windings: −
a primary (high-voltage) winding with a highest voltage for equipment from 3,6 kV to 36 kV;
−
a secondary (low-voltage) winding with a highest voltage for equipment not exceeding 1,1 kV.
NOTE 1
This document may be applied, either as a whole or in part, to transformers immersed in a synthetic insulating liquid.
NOTE 2 This document may be applied, either as whole or in part, to transformers having windings with more than one rated voltage. In this case the rated power for each rated voltage shall be specified by the purchaser.
The object of this document is to lay down requirements related to electrical characteristics and design of three phases distribution transformers immersed in mineral oil.
2
Normative references
The following referenced documents are indispensable 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. EN 50216
series
Power transformer and reactor fittings
EN 50464-2
series
Three-phase oil-immersed distribution transformers 50 Hz, from 50 kVA to 2500 kVA with highest voltage for equipment not exceeding 36 kV
EN 60076
series
Power transformers (IEC 60076 series)
IEC/TR 60616
3 3.1
Terminal and tapping markings for power transformers
Electrical characteristics Rated power
The values of the rated power are 50 kVA – 100 kVA – 160 kVA – 250 kVA – 315 kVA – 400 kVA – 500 kVA – 630 kVA – 800 kVA – 1 000 kVA – 1 250 kVA – 1 600 kVA – 2 000 kVA – 2 500 kVA. The underlined values are preferred.
-5-
3.2
EN 50464-1:2007
Highest voltages for equipment for windings
Insulation levels and dielectric tests shall be in accordance with the requirements of EN 60076-3. The values of the highest voltage for equipment are
Licensed Copy: :FULLNAME, : DATE, Uncontrolled Copy, (c) BSI
−
for the high-voltage winding: 3,6 kV– 7,2 kV – 12 kV – 17,5 kV – 24 kV – 36 kV,
−
for the low-voltage winding: 1,1 kV.
3.3 3.3.1
Rated voltages of windings For the high-voltage winding
The rated value of the high voltage winding is above 1,1 kV, up to and including 36 kV. 3.3.2
For the low-voltage winding
The rated voltage shall be chosen among the following preferred values: 400 V – 410 V – 415 V – 420 V – 433 V. NOTE This document may be applied, either as a whole or in part, to transformers with rated low voltages below 400 V and above 433 V.
3.4
Tapping
The HV winding can be provided with tapping. The preferred tapping ranges are ± 2,5 % or ± 2 x 2,5 % unless otherwise specified ,but in any case maximum taps shall not exceed 7 positions and the total maximum range shall not exceed 15 %. The tapping range has to be specified by the purchaser or by agreement between manufacturer and purchaser. These taps shall be connected to an off-circuit tapping switch. 3.5
Connections
Connections shall be made in accordance with the provisions of Table 1. Table 1 – Connections for distribution transformers Rated power kVA
50 and 100
≥ 160
U m ≤ 24 kV
Y zn or D yn
D yn
U m = 36 kV
Y zn or D yn
D yn
The clock hour figure shall be 5 or 11. Connection symbol
Y zn 5 ; Y zn 11 ; D yn 5 ; D yn 11.
EN 50464-1:2007
-6-
Connections and clock figure shall be specified by the purchaser. NOTE This document may be applied, either as a whole or in part, to transformers having connections other than those mentioned above.
3.6
Dimensioning of neutral connection of the low-voltage winding
Licensed Copy: :FULLNAME, : DATE, Uncontrolled Copy, (c) BSI
The neutral conductor and terminal of the low-voltage winding shall be dimensioned for rated current and earth fault current, unless otherwise specified. 3.7
Short-circuit impedance
The preferred values of the short-circuit impedance at a reference temperature of 75 °C are −
for rated voltage ≤ 24 kV (refer to Table 2),
−
for rated voltage = 36 kV (refer to Table 4).
NOTE Other values of short-circuit impedance may be specified by the purchaser for particular system service conditions, e.g. in the case of parallel options.
3.8
Losses and sound power level
For transformers having listed values of rated power and preferred value of short-circuit impedance in accordance with 3.1 and 3.7, the values of losses and sound power levels are stated, for Um ≤ 24 kV, in Table 2 (load losses) and Table 3 (no load losses and sound power levels), for Um = 36 kV in Table 4 (load losses) and Table 5 (no load losses and sound power levels). The sound power levels given in Table 3 for Um ≤ 24 kV and in Table 5 for Um = 36 kV are the maximum admitted (no tolerance). Lower sound power levels can be specified by the purchaser. To choose the correct load losses (Table 2 or Table 4) and no load losses (Table 3 or Table 5) or when the loss values stated in the tables do not correspond to the actual evaluation of the energy cost, the transformers can be requested and offered with losses differing from the tabled losses; the capitalisation formula given in annex is applicable. 3.8.1
Load losses, no load losses and sound power level for Um
24 kV
In the following tables, column A values correspond to the lowest losses as commonly used in EU for electrical devices. Transformers can be requested and offered with LwA lower than the tabled values. A “low noise” series with no load losses Eo, Do, Co or Bo can be proposed with the LwA from the tabled values of Do, Co, Bo or Ao respectively.
-7-
EN 50464-1:2007
Licensed Copy: :FULLNAME, : DATE, Uncontrolled Copy, (c) BSI
Table 2 – Load losses Pk (W) at 75 °C for Um
24 kV
Rated power
Dk
Ck
Bk
Ak
Short circuit impedance
kVA
W
W
W
W
%
50
1 350
1 100
875
750
100
2 150
1 750
1 475
1 250
160
3 100
2 350
2 000
1 700
250
4 200
3 250
2 750
2 350
315
5 000
3 900
3 250
2 800
400
6 000
4 600
3 850
3 250
500
7 200
5 500
4 600
3 900
630
8 400
6 500
5 400
4 600
630
8 700
6 750
5 600
4 800
800
10 500
8 400
7 000
6 000
1 000
13 000
10 500
9 000
7 600
1 250
16 000
13 500
11 000
9 500
1 600
20 000
17 000
14 000
12 000
2 000
26 000
21 000
18 000
15 000
2 500
32 000
26 500
22 000
18 500
4
6
EN 50464-1:2007
-8-
Table 3 – No load losses P0 (W) and sound power level (Lw(A)) for Um
Licensed Copy: :FULLNAME, : DATE, Uncontrolled Copy, (c) BSI
Rated power
D0
E0
C0
B0
24 kV Short circuit impedance
A0
P0
LwA
P0
LwA
P0
LwA
P0
LwA
P0
LwA
kVA
W
dB(A)
W
dB(A)
W
dB(A)
W
dB(A)
W
dB(A)
50
190
55
145
50
125
47
110
42
90
39
100
320
59
260
54
210
49
180
44
145
41
160
460
62
375
57
300
52
260
47
210
44
250
650
65
530
60
425
55
360
50
300
47
315
770
67
630
61
520
57
440
52
360
49
400
930
68
750
63
610
58
520
53
430
50
500
1 100
69
880
64
720
59
610
54
510
51
630
1 300
70
1 030
65
860
60
730
55
600
52
630
1 200
70
940
65
800
60
680
55
560
52
800
1 400
71
1 150
66
930
61
800
56
650
53
1 000
1 700
73
1 400
68
1 100
63
940
58
770
55
1 250
2 100
74
1 750
69
1 350
64
1 150
59
950
56
1 600
2 600
76
2 200
71
1 700
66
1 450
61
1 200
58
2 000
3 100
78
2 700
73
2 100
68
1 800
63
1 450
60
2 500
3 500
81
3 200
76
2 500
71
2 150
66
1 750
63
NOTE
P 0 = no load losses. L wA = sound power level.
3.8.2
Load losses, no load losses and sound power level for Um = 36 kV
%
4
6
Transformers can be requested and offered with LwA lower than the tabled values. A “low noise” series with no load losses C036, B036 can be proposed with the LwA from the tabled values of B036, A036, respectively.
-9-
EN 50464-1:2007
Licensed Copy: :FULLNAME, : DATE, Uncontrolled Copy, (c) BSI
Table 4 – Load losses Pk36 (W) at 75 °C for Um = 36 kV Rated power
Ck36
Bk36
Ak36
Short-circuit impedance
kVA
W
W
W
%
50
1 450
1 250
1 050
100
2 350
1 950
1 650
160
3 350
2 550
2 150
250
4 250
3 500
3 000
400
6 200
4 900
4 150
630
8 800
6 500
5 500
800
10 500
8 400
7 000
1 000
13 000
10 500
8 900
1 250
16 000
13 500
11 500
1 600
19 200
17 000
14 500
2 000
24 000
21 000
18 000
2 500
29 400
26 500
22 500
4 or 4,5
6
Table 5 – No load losses P036 (W) and sound power level (Lw(A) ) for Um = 36 kV Rated power
B036
C036
Short-circuit impedance
A036
P0
LwA
P0
LwA
P0
LwA
kVA
W
dB(A)
W
dB(A)
W
dB(A)
50
230
52
190
52
160
50
100
380
56
320
56
270
54
160
520
59
460
59
390
57
250
780
62
650
62
550
60
400
1 120
65
930
65
790
63
630
1 450
67
1 300
67
1 100
65
800
1 700
68
1 500
68
1 300
66
1 000
2 000
68
1 700
68
1 450
67
1 250
2 400
70
2 100
70
1 750
68
1 600
2 800
71
2 600
71
2 200
69
2 000
3 400
73
3 150
73
2 700
71
2 500
4 100
76
3 800
76
3 200
73
NOTE
P 0 = no load losses. L wA = sound power level.
%
4 or 4,5
6
EN 50464-1:2007
3.9
- 10 -
Tolerances and penalties
Within the limits of tolerances (EN 60076-1) the application of penalties/bonus with regard to losses is left to the agreement between manufacturer and purchaser at the time of enquiry and order. 3.10 Tests
Licensed Copy: :FULLNAME, : DATE, Uncontrolled Copy, (c) BSI
3.10.1 Routine tests EN 60076-1 applies. 3.10.2 Type tests EN 60076-1 applies. 3.10.3 Special tests EN 60076-1 applies. 3.11 Insulation levels and dielectric tests Insulation levels and dielectric tests shall be in accordance with the requirements of EN 60076-3, as further detailed below. −
High-voltage winding The rated values of the short duration power frequency withstand voltage and of the lightning impulse withstand voltage are given by Table 2 of EN 60076-3, Series 1.
−
Low-voltage winding According to Table 3 of EN 60076-3, for the normal insulation level, only a short duration power frequency withstand voltage equal to 3 kV, is specified. NOTE The values for short duration power frequency withstand and/or for the lightning impulse withstand test between windings and earth are to be stated by the purchaser. The most usual values are respectively 10 kV and 30 kV.
4 4.1
Design requirements Type of oil preservation system and degree of sealing
The type of oil preservation system and the degree of sealing shall be indicated in the enquiry and order (Table 6). 4.2
Terminal markings
Terminal markings should preferably be in accordance with IEC/TR 60616 unless otherwise specified. 4.3
Terminations
The terminations to be used can be of the following types: a)
open type bushings;
b)
cable boxes (see 3.4.3);
c)
plug-in type bushings;
d)
LV busbars.
The requirements of the different types of terminations should be matter of separate HDs/ENs.
- 11 -
4.4
EN 50464-1:2007
Distance between bushings
4.4.1
Distances between high-voltage oil-air bushings
The bushings clearance shall meet the requirements of EN 60076-3.
Licensed Copy: :FULLNAME, : DATE, Uncontrolled Copy, (c) BSI
For transformers with a highest voltage for equipment equal to 24 kV and lightning impulse 125 kV, the minimum distance between live parts shall be 210 mm and between the highest sheds 120 mm. For transformers with a highest voltage for equipment equal to 36 kV, and lightning impulse 170 kV, the minimum distance between live parts shall be 280 mm and between the highest sheds 180 mm. However, shorter distances may be agreed, subject to confirmation by test or by service experience. NOTE 1 If the user intends to make the connections to the transformer in a way which may reduce the clearances provided by the transformer itself, then this should be brought to attention in the enquiry (EN 60076-3). NOTE 2 When an oil-immersed transformer is specified for operation at an altitude higher than 1 000 m, clearances shall be designed accordingly. It may then be necessary to select bushings designed for higher insulation levels than those specified for the internal insulation of the transformer windings (EN 60076-3).
4.4.2
Preferred distance between centres of low-voltage bushings
−
For currents up to 250 A
70 mm
−
For currents above 250 A and up to 2 000 A
150 mm
−
For currents above 2 000 A
165 mm
4.4.3
Cable boxes
For transformers in which the terminations are made in cable boxes, EN 50464-2 applies. 4.5
Rollers
When rollers are fitted, they shall comply with EN 50216-4.
5
Accessories
Accessories shall be in accordance with the appropriate Part of EN 50216. The type of oil preservation system and the degree of sealing shall be indicated in the enquiry and order. Transformers should normally be fitted with the accessories listed in Table 6. On request by the purchaser or recommended by the manufacturer, additional accessories may be fitted, for instance: −
arcing horns on H.V. porcelain bushings;
−
gas and oil actuated relay for liquid immersed transformers with conservator (EN 50216-2);
−
protective relay for hermetically sealed liquid immersed transformers without gas cushion (EN 50216-3);
EN 50464-1:2007
- 12 -
−
provision for pad-locking the off-circuit tap-changer;
−
pulling eyes/lugs. Table 6 – Accessories
Licensed Copy: :FULLNAME, : DATE, Uncontrolled Copy, (c) BSI
Accessories
Free Breathing
Hermetically sealed
Gas cushion
Conservator
Gas cushion
Totally filled
Rating plate
X
X
X
X
2 earthing terminals
X
X
X
X
Lifting lugs
X
X
X
X ab
Oil level indicator
X
X
a
Filling hole and plug
X
X
X
X
Drain and sampling plug or valve
a
X
a
a
Dehydrating breather
X
X
Thermometer pocket (EN 50216-4)
X
X
X
X
a
If requested.
b
An equivalent device may be provided.
6
Efficiency and voltage drop (at reference temperature)
6.1
Efficiency
The efficiency of a power transformer is given for any load condition by the ratio between the out power (P2) and the input power (P1).
η = 100 ⋅
P2 (%) P1
Because of the difficulty to determine the efficiency by direct measurements, it can be evaluated conventionally through the guaranteed or measured losses as follows.
α 2 ⋅ Pcc + P0 η = 100 ⋅ 1 − 2 α ⋅ S + α ⋅ Pcc + P0
(%)
where Pcc
= load loss at rated current and reference temperature;
P0
= no load loss at rated voltage and frequency;
S
= rated power;
α
= load factor (p.u.).
- 13 -
6.2
EN 50464-1:2007
Voltage drop ( u%)
The voltage drop for any load condition (secondary current and power factor) is given by the following relation:
∆u % = ( I 2 / I 2 n ) ⋅ (R % ⋅ cos ϕ 2 + X % ⋅ sin ϕ 2 ) + (1 / 200 ) ⋅ {(I 2 / I 2 n ) ⋅ ( X % ⋅ cos ϕ 2 − R % ⋅ sin ϕ 2 )}
Licensed Copy: :FULLNAME, : DATE, Uncontrolled Copy, (c) BSI
2
where R%
= load loss expressed in % of rated power;
X%
= reactive power expressed in % of rated power;
I2
= load secondary current (A);
I2n
= secondary rated current (A);
(I2 / I2n) = load factor;
ϕ2
= phase angle between secondary voltage and current.
EN 50464-1:2007
- 14 -
Annex A (informative) Capitalisation evaluation
Licensed Copy: :FULLNAME, : DATE, Uncontrolled Copy, (c) BSI
A transformer produces losses due to the magnetisation of the core (no load losses P0) and due to the current carrying windings (load losses Pk). No load losses are generated whenever the transformer is energised and usually are considered for 8 760 h per year. They are independent of the load while load losses relate to the square of the current (Pk ~I²). The sum of both losses represents a loss of energy translated into heat which has to be dissipated by the cooling system of the transformer. Since energy has a certain cost, it is important to be aware of the financial value of the losses generated during the lifetime of the transformer in addition to the initial purchase cost. The loading profile, the transformer losses and the energy cost should be taken into account in order to select the optimal no load losses and load losses. The losses tabled in this standard represent nowadays European practice. However, this evaluation may change over time and can be different in each country or for each user, depending on local investment or energy policies. Therefore, transformers can be requested or offered with no load losses and/or load losses different from those tabled in this standard to satisfy particular requirements. The sum of purchase cost and energy cost (load losses and no load losses) is called capitalised cost and represents an important part of the investment for the purchaser. This analysis may be done by using a capitalisation formula as follows:
C C = C T + A ⋅ P0 + B ⋅ PK where CC
= capitalised cost;
CT
= purchase cost of transformer;
A
= value indicated by the purchaser in the enquiry expressed in local currency per watt (e.g. €/W) corresponding to no load losses;
P0
= guaranteed no load losses in watts;
B
= value indicated by the purchaser in the enquiry expressed in local currency per watt (e.g. €/W) corresponding to load losses;
Pk
= guaranteed load losses in watts.
- 15 -
EN 50464-1:2007
Licensed Copy: :FULLNAME, : DATE, Uncontrolled Copy, (c) BSI
Bibliography EN 50180
Bushings above 1 kV up to 36 kV and from 250 A to 3,15 kA for liquid filled transformers
EN 50181
Plug-in type bushings above 1 kV up to 36 kV and from 250 A to 1,25 kA for equipment other than liquid filled transformers
EN 50386
Bushings up to 1 kV and from 250 A to 5 kA, for liquid filled transformers
EN 50387
Busbar bushings up to 1 kV and from 1,25 kA to 5 kA, for liquid filled transformers
BS EN 50464-1:2007
BSI — British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions.
Licensed Copy: :FULLNAME, : DATE, Uncontrolled Copy, (c) BSI
It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: +44 (0)20 8996 9000. Fax: +44 (0)20 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: +44 (0)20 8996 9001. Fax: +44 (0)20 8996 7001. Email:
[email protected]. Standards are also available from the BSI website at http://www.bsi-global.com. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel: +44 (0)20 8996 7111. Fax: +44 (0)20 8996 7048. Email:
[email protected]. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel: +44 (0)20 8996 7002. Fax: +44 (0)20 8996 7001. Email:
[email protected]. Information regarding online access to British Standards via British Standards Online can be found at http://www.bsi-global.com/bsonline. Further information about BSI is available on the BSI website at http://www.bsi-global.com. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means – electronic, photocopying, recording or otherwise – without prior written permission from BSI.
BSI 389 Chiswick High Road London W4 4AL
This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. Details and advice can be obtained from the Copyright & Licensing Manager. Tel: +44 (0)20 8996 7070. Fax: +44 (0)20 8996 7553. Email:
[email protected].