Screw Terminal Connections; Connections To Optical Communication Interfaces - Siemens siprotec 7SA522 User Manual

Hardware and Connections
2.2.2

Screw terminal connections

Terminal Blocks
Connections to
Terminals
2.2.3

Connections to Optical Communication Interfaces

Optical
Communication
Interfaces
Connections to
Optical
Communication
Interfaces
2-18
All connections to the device are by means of two-tier screw terminals located at the
top and bottom of the surface mounting housing. For the housing size
such terminals and for the housing size
The plug connection module in the device for the current terminals automatically short-
circuits the current transformer circuits when the modules are withdrawn. This does
not reduce necessary care that must be taken when working on the current transform-
er secondary circuits.
Solid conductor or stranded wire with lugs can be used.
The following specifications must be observed:
Direct cable connections: solid or stranded conductor with connector sleeve
conductor with cross-section of 0.5 mm
Use copper wires only!
Maximum tightening torque: 1.2 Nm (0.9 ft-lb or 10.6 ft-in)).
Optical communication interfaces may be 1- to 4-channel. The ports are supplied with
caps to protect the optical components against dust or other contaminants. The caps
can be removed by turning them 90° to the left.
A maximum of two fibre optic channels are located in each inclined housing. In the
case of device versions with 1 and 2 channels, the inclined housing is located at the
bottom side of the device. With device versions having up to a maximum of 4 fitted
optical channels, there is a second inclined housing mounted to the top side of the de-
vice (refer to Figure 2-18). If no inclined housing is fitted a cover plate is mounted in-
stead. Unused fibre optic connections are replaced by plastic studs.
Optical connector type:
Fibre type:
Wavelength:
Allowable bending radius:
Laser class 1 (acc. EN 60825–1) is achieved with fibre type G50/125 µm and
G62.5/125 µm.
1
/ there are 200 such terminals.
1
2 2
to 7 mm (AWG 20 to 9).
ST–connector
Multimode graded-index ("G") optical fibre
G50/125 µm,
G62.5/125 µm,
G100/140 µm
λ = 820 nm (approximately)
For indoor cable r
min
For outdoor cable r
min
1
/ there are 100
2
= 5 cm (2 in)
= 20 cm (8 in)
7SA522 Manual
C53000-G1176-C119-2