Fig. 1: RST
Compliance with Standards
FAA: AC 150/5345-47
ICAO: Aerodrome Design Manual Part 5, para. 3.2.1.7
IEC: 61823
Various national standards
Uses
To supply the airport ground lighting from a series circuit.
The primary windings of all RST’s in a given circuit are connected in series and supplied from a constant current regulator to ensure:
– the continuity of the series circuit even in case of lamp failure.
– the isolation of the low voltage lamps in the luminaries from the high voltage series circuit.
Features
• ADB have succeeded in keeping in a much smaller volume the outstanding technical characteristics of the ring-core transformer.
• Very flat load curves guarantee consistent light outputs over a wide
secondary load range.
• Overlapping load curves between the various transformers of the range make each load between 10 W and 360 W covered by at least one transformer.
• Improved safety for the operating personnel:
Physical separation of the windings and absence of creeping paths between windings or windings and core prevent electrical shock hazards during relamping.
The (optional) earthing of the secondary winding
increases safety even more.
• High reliability thanks to extensive material research and to systematic tests at all manufacturing stages (electric tests before and after encapsulation, final dielectric test under 10 kV AC and final insulation test under 15 kV DC).
• Encapsulated in a special, non-water absorbing, thermo-plastic elastomer, resisting to ozone and UV exposure, chemical agents such as acids, alkali and oil and shocks and rough handling.
As a result the RST may be immersed, buried or exposed to sunlight and adverse weather.
• Self protected:
Even with short-circuited or open secondary winding; no damage or reduced lifetime of the RST occurs.
Fig. 2
• Factory-moulded plugs and receptacles:
– reduced installation and maintenance costs.
– guarantee watertight assembly.
• Small volume and low weight.
• Ambient temperature: –55°C to +65°C.
A.06.112e

Construction (Fig. 3)
1. Encapsulation
2. Single core primary cable AWG 8 – 5 kV
3. Two core secondary cable AWG 12 – 0.6 kV
4. Moulded two pole receptacle – Style 8
5. Moulded single pole plug – Style 2
6. Moulded single pole receptacle – Style 9
7. Earthing wire (option)
Installation
The RST is designed for direct burial into the ground. Nevertheless, for ease of access in case of exchange or routine check, it is recommended to install it in steel, masonry or concrete transformer housings or pits (Fig. 2).
Connection (Fig. 4)
On the primary side:
The single pole plug (receptacle), to FAA specification L-823
(AC 150/5345-26B), is plugged into the single pole receptacle (plug) of the primary series circuit cable.
On the secondary side:
• The two-pole receptacle is plugged straight into the two-pole plug of the luminary or of an extension cable assembly.
• The RST, fitted with an earthing wire on one extremity of the secondary winding, meets the ICAO Aerodrome Design Manual – Part 5 – para
3.2.1.7.a.
Fig. 3
3
C
C
R
2
L
ST
6
L: Light
ST: Series Transformer
CCR: Constant Current Regulator
Fig. 4
4
1
6
2
Technical Data
Rated secondary power
Rated values
Primary/ secondary current
Frequency Power range
(2)
Load range
(3)
150
200
300
10/15
20/25
30/45
65
W
10/15
20/25
30/45
65
100
100
150
200
300
A
6.6 / 6.6
6.6 / 6.6
6.6 / 6.6
6.6 / 6.6
6.6 / 6.6
6.6 / 6.6
6.6 / 6.6
6.6 / 6.6
6.6 / 6.6
6.6 / 6.6
6.6 / 6.6
6.6 / 6.6
6.6 / 6.6
6.6 / 6.6
6.6 / 6.6
6.6 / 6.6
Hz
50
50
50
50
50
50
50
50
60
60
60
60
60
60
60
60
W
12,5 – 20
50 – 185
40 – 230
25 – 360
Ohm
0,29 – 0,47
18 – 30 0,41 – 0,70
35 – 60 0.80 – 1.38
40 – 90 0.92 – 2.07
50 – 125 1.10 – 2.87
45 – 185 1.00 – 4.25
25 – 230 0.57 – 5.28
25 – 360 0.57 – 8.25
12,5 – 20 0,29 – 0,47
18 – 30 0,41 – 0,70
35 – 60 0.80 – 1.38
40 – 100 1.03 – 2.29
35 – 125 0.80 – 2.87
1.10 – 4.25
0.92 – 5.28
0.57 – 8.25
1) Primary supplied by a sinusoidal voltage source of the rated frequency.
2) For secondary current comprised between 6.53 and 6.67 A.
3) The secondary current remains between 6.53 A and 6.67 A for the indicated load range.
4) Primary current = 6.6 A.
Performances at 20°C (typical values) (1)
Efficiency at
nominal load
IEC FAA
Power factor at nominal load
IEC FAA
91.50
92.00
94.50
70.00
74.00
86.00
87.00
%
70.00
74.00
86.50
87.00
89.50
89.50
91.50
92.50
94.00
92.00
92.50
95.00
70.00
74.00
87.00
87.50
%
70.00
74.00
87.00
87.50
90.00
90.00
92.00
92.50
95.00
0.98
0.98
0.98
0,97
0,97
0.98
0.98
IEC
0,98
0,98
0.98
0.98
0.98
0.98
0.98
0.98
0.98
0,98
0.98
0,98
0,97
0,97
0.98
0.98
FAA
0,98
0,98
0.98
0.98
0.98
0.98
0.98
0.98
0,98
Open circuit voltage
52
65
105
17
30
6
8
V (rms)
5
8
17
25
37
37
52
62
99
Short circuit current
(4)
6.68
6.67
6.67
6,73
6,73
6.73
6.71
A
6,73
6,73
6.73
6.71
6.70
6.69
6.70
6.68
6.67

Outline dimensions
W
Nominal length of primary leads: 60 cm
Nominal length of secondary lead: 120 cm
Fig. 5
H
L
300W
200W
150W
100W
65W
30/45W
25W
50 Hz
60 Hz
15W
0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360
Fig. 6: Power coverage as per IEC 61823 in 50 Hz & 60 Hz
Ordering Code
1ST 300 6 6 5 E S
Power range
10/15 W = 010
20/25 W = 020
30/45 W = 045
65 W = 065
100 W = 100
150 W = 150
200 W = 200
300 W = 300
Primary current
6.6 A = 6
Secondary current
6.6 A = 6
Frequency
50 Hz = 5
60 Hz = 6
50/60 Hz = D (only for 15 W and 25 W)
Earthing wire without earthing wire = O with earthing wire = E
Special rements to be specified in full text = S
Complete, delete or modify as necessary.
Dimensions and Packing Data
Rated secondary power
W
200
300
10/15
20/25
30/45
65
100
10/15
20/25
30/45
65
100
150
150
200
300
Rated frequency
Hz
60
60
60
60
50
50
60
60
60
60
50
50
50
50
50
50
114
114
125
125
125
147
147
153
114
Length
(L)
114
114
114
125
147
147
153
Dimensions (mm)
Dimensions (mm)
101
101
115
115
115
144
144
146
101
Width
(W)
101
101
101
115
144
144
146
66
78
80
80
90
95
105
130
62
Height
(H)
62
66
80
80
95
95
110
Net weight
(Kg)
5.00
7.30
1,36
1,95
2.50
2.80
2.90
1,36
1,59
2.70
2.80
3.40
4.90
4.80
5.00
5.70
90
80
175
175
150
140
140
175
175
150
140
140
100
100
90
80
Quantity per box
Gross weight
Per shipping box
Wooden box dimensions
(mm) (Kg)
490
625
280
320
445
435
450
280
320
445
435
520
530
520
490
650
1150 x 800 x 750
1150 x 800 x 750

Suggested Specification
The series transformer shall be in full compliance with FAA AC150/5345-47 and IEC
61823. With one extremity of the secondary winding earthed, it shall also be in compliance with ICAO Aerodrome Design Manual, Part 5, para. 3.2.1.7.
The core shall be of rectangular shape, made from low-loss, grain oriented steel laminations.
Primary and secondary windings shall be adequately separated but not super-imposed.
There will be no creeping path between the primary and the secondary windings. The transformer and connection leads shall be pressure encapsulated with thermo-plastic elastomer, which resists to ozone and UV light exposure, to chemical agents and to shocks and rough handling. The encapsulation must not absorb water.
The series transformer shall be connected in the series circuit via L-823 connectors moulded onto two 60 cm long single-core
AWG 8 cables rated 5 kV and to the secondary circuit by one 120 cm two-core AWG 12 cable.
The electrical performances shall be equal to or better than those given in the table of paragraph
“Technical Data”.
ADB
Airfield Solutions
Leuvensesteenweg 585
B-1930 Zaventem
Belgium
Phone: +32 (2) 7221711
Fax: +32 (2) 7221764 info.adb@adb-air.com www.adb-air.com
© ADB all rights reserved order number DOCA06112EV5 subject to modifications