4AM5xxx e
4AM5xxx e
4AM5xxx e
Auxiliary current transformers 4AM50, 4AM51, 4AM52 and isolating transformers 7XR95
4AM5. Fig. 1
7XR9 500
Overview
Application Comment Climatic requirements according to former DIN 40 040 Features
Multitap aux. current transformer to match different current transformer ratios. 4AM51 707AA: Standard version, primarily for transformer overall differential protection. 4AM52 722AA: Version with double thermal withstand capability, e.g. when connecting to widerange current transformer (continuous rating 2 x IN). 4AM52 723AA: Version with higher saturation factor (mainly for the busbar differential protection). Greater overcurrent factor because of higher voltages Auxiliary current transformer for C.T. powered trip coils in stations where no battery supply can be made available. 4AM50 652CB: For 1 A C.T.s 4AM50 708AB: For 5 A C.T.s Suitable for tripping coils with IN x 0.5 A or 1 A, VN x 40 V or 20 V, P x 20 VA. Input and matching current transformer for phase selective busbar differential protection. 4AM51 201DA: For 1 A C.T.s 4AM51 202DA: For 5 A C.T.s1) Input 3phase summation current transformer for busbar differential protection. 4AM51 203DA: For 1 A C.T.s 4AM51 204DA: For 5 A C.T.s Isolating transformer for pilotwire differential protection. Provides galvanic isolation between pilot wires and relays. 7XR9 500: For differential protection relays 7SD10, 7SD74 and 7SD503 (for use with 3 wires of control cables or protection cables) 7XR9 513: For pilotwires differential relays 7SD24, 7SD76 and 7SD502 (for use with 1 pair of telephone wires).
Numerous ratios can be selected using terminal connections (see page 2/31) fN = 45 to 60 Hz
HKD HKD
fN = 45 to 60 Hz with varistor
HKG HKG
HKG HKG
fN = 45 to 60 Hz with varistor
Isolating transformer
HKG HKG
7 kV insulation 20 kV insulation
Climatic requirements:
HKG = 25 _C to +125 _C relative humidity max. 75 % annual average <65 % on 60 days of the year up to 85 % (equally distributed over the year) condensation not permissible
HKD = 25 _C to +125 _C relative humidity max. 90 % annual average <80 % on 30 days of the year up to 100 % (equally distributed over the year) condensation permissible
1) If increased thermal withstand is required type 4AM51 204DA is recommended. Siemens LSA 2.2.6 . March 1995
1 e Siemens AG 1995
Differential Relays
Auxiliary current transformers 4AM50, 4AM51, 4AM52 and isolating transformers 7XR95
A B C D E F G H
KaLaKbLb
ka la
A B C
D E F
A B C
D E F
A B C D E F G H
J K L MN O P Q
KcLcKdLd
kb lb
G H J
Y Z
Y Z
J K L MN O Y Z
4AM51 707AA 4AM52 722AA 4AM52 723AA Fig. 2 Connection of windings Order No.
4AM51 201DA
4AM51 202DA
Windings of auxiliary current transformers Number of windings (in relation to each other)
A 1 B C 2 D E 7 F G 16 H I 1 K L 2 M N 7 O P 16 Q
Weight, approx.
Rated current IN1) Max. voltage Rated current IN1) Max. voltage Rated current IN1) Max. voltage Rated current IN1) Number of windings Number of windings Rated current IN1)
A V A V A V A
5 2 10 2 5 4 1
5 4 10 4 5 8 1
5 14 10 14 5 28 1
1 32 2 32 1 64 1
5 2 10 2 5 4
5 4 10 4 5 8
5 14 10 14 5 28
1 32 2 32 1 64
3.4 kg 5 5 kg kg
Ka La Kb Lb 110 110
Kc Lc Kd Ld 110 110
ka
88
la
kb
88
lb
1.25 5 5 5
4AM50 708AB
Rated current IN1) Number of windings Number of windings Rated current IN1) Number of windings
Ka La Kb Lb 22 22
Kc Lc Kd Ld 22 22
ka
88
la
kb
88
lb
A
A
1.25
1 B 2 C D
1.25
E 4 8 F G 16 H 32 500 I Y Z
Max. current, continuously Max. voltage Max. current, continuously Max. voltage Number of windings Max. current, continuously Max. voltage
A V A V
A
3.5 kg 3.5 kg
0.8
C 6
3.2
G 18
4AM51 203DA
3.5 kg
A V
4 1.2
A 1 B
4 2.4
C 2 D
4 3.6
E 3 F
4 7.2
G 4 H
4 9.6
I 6 K
4 14.4
L 8 M
2 36
N 12 O Y
0.85 200
Z 500
4AM51 204DA
3.5 kg
17.5 0.4
17.5 0.8
17.5 1.2
17.5 1.6
17.5 2.4
17.5 3.2
8 4.8
7XR9 500
Isolating transformer for differential protection with three pilotwires Isolating transformer for differential protection with two pilotwires
a9 a10 a8
b9 b10 b8 K1 M1 L1
Isolating transformer 1 : 1 for voltages up to 4,2 kV test voltage 7 kV Isolating transformer 1 : 1, max. 550 V 0,4 A continously, 3 A 10 s, 10 A 1 s test voltage 20 kV, 50 Hz, 1 min
7XR9 513
approx. 5 kg
K2 M2 L2
1) Thermal withstand with simultaneous loading of all the windings: 1.2 x IN/continuously; 10 x IN/10 s; 25 x IN/1 s.
Differential Relays
Dimension drawings in mm
c g
Type 4AM50
f
a 84 84 90
b 96 96 120
d 70 84 83
e 88 103 102
4AM51
5.8 a b d e
4AM52
58
72
5.8 84 96 39 84 102.5
11
ca.55
6.5
106
108
90
181.5
292
204 220
162 143
77 8 220
40
100 122
86
Differential Relays
The technical data, dimensions and weights are subject to change unless otherwise stated on the individual pages of this catalog. The illustrations are for reference only.
We reserve the right to adjust the prices and shall charge the price applying on the date of delivery.
A 9.91 a
Export Regulations In accordance with present German and US export regulations export licences (dated 02.95) are not required for the products listed in this catalog. Export and reexport are therefore
permissible without the approval of the relevant authorities except where current German export regulations contain countryspecific restrictions.
Subject to change. Relevant are the criteria stated in the delivery note and in the invoice. An export licence may be required due to countryspecific application of the product.
Trademarks All product designations used are trademarks or product names of Siemens AG or of suppliers.
Responsible for Technical contents: Norbert Schuster, Siemens AG, EV S T11, Nrnberg General editing: Claudia KhnSutiono, Siemens AG, EV MK 2, Erlangen
Bereich Energiebertragung und -verteilung Geschftsgebiet Zhler, Sekundr- und Netzleittechnik P. O. Box 48 06 D-90026 Nrnberg 4 Siemens Aktiengesellschaft