Design; Models - Siemens SIPROTEC 7SD600 System Manual

Numerical line differential protection SIPROTEC 7SD600 V3.0
2

Design

2.1

Models

All protection functions, including the converter, are
installed on a p.c.b. in double-height Eurocard format.
This p.c.b., combined with a locating plate (guide rail),
a connector (on the board) and a front panel, consti
tute the device's plug-in module. This is installed in a
7XP20 housing. The studs on the locating plate, the
spacers on the p.c.b. and the shape of the connector
all serve to ensure that the plug-in module is cor
rectly guided in the housing. The interior of the hou
sing is un-lacquered and the electrical properties of
the housing material are such that it can carry out di
scharging and shielding functions. The module is lin
ked to the housing interior by means of contact
springs with a large contact area which establishes an
earth contact before the plug connecetion is made.
An unlacquered contact point is available on the hou
sing, for the attachment of a copper band using two
earth screws to establish a low-resistance large area
contact.
The housing has protection class IP51, the terminals
have IP21.
Three different housing models are currently availa
ble.
D 7SD600K-KBKKK- in housing 7XP20 with terminals
on the side of the housing for panel surface moun
ting
The housing consists of a sheet-metal tube and a
connector with four holes on the rear plate for at
tachment to the control panel.
All external signals lead to this connector on the
housing which latches onto the rear panel of the
housing and is directly connected to the screw
terminals (i.e. without intermediate wiring). Each
electrical connection has a screw terminal able to
accommodate a maximum of two ring-lugs. If pre
ferred, up to two wires (different cross-sections
permitted) can be secured directly to the terminal
Siemens AG January 1999
System manual Order no. E50417-G1176-C069-A1
without ring-lugs. Only copper wires should be
used.
For dimensions, see Figure 2.1.
D 7SD600K-KDKKK- in housing 7XP20 with termi
nals on top and bottom for panel surface moun
ting
The housing consists of a sheet-metal tube, a rear
plate and two metal brackets for attachment to
the control panel or in the cubicle.
All external signals lead to two-tier screw termi
nals which are located below and above on the
perforated covers. The terminals are consecutively
numbered from left to right on each tier.
For dimensions, see Figure 2.2.
D 7SD600K-KDKKK- in housing 7XP20 with termi
nals at the rear for panel flush mounting or cubi
cle mounting
The housing consists of a sheet-metal tube, a rear
plate and two metal brackets for attachment to
the control panel or in the cubicle.
All external signals lead to the connector (on the
housing) which latches into an opening on the rear
plate of the housing. Each electrical connection is
equipped with a screw terminal able to accommo
date a maximum of two ring-lugs, and parallel to
that, a plug-in connection (crimp snap-on connec
tor). Use of the screw terminals for the wiring is
recommended, as the plug-in connectors require
special tools. Only use copper wires.
For housing dimensions, see Figure 2.3.
2
Design
2 - 1