Instruction
Manual
SSG
page
21
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4.2. Description of the actuating and control functions
After the transportation lock (Pos.-No. 5) is disengaged the cutting cycle is initiated by
actuating the pump lever (Pos.-No. 4). When actuating the pump lever the pump assembly
(Pos.-No. 1) delivers non conducting hydraulic oil from the oil reservoir (Pos.-No. 2) into
the cylinder of the cutting head. From outside the system this procedure can be monitored
by the rise of the needle of the pressure gauge (Pos.-No. 8) respectively the closing of the
blades. As soon as the blades (Pos.-No. 12) touch the cable, respectively a pressure of 50
bar is reached, the pump switches from the fast advance speed into the slow working
speed. By this change the effort during the cutting procedure drops temporarily. After this
change the blades start penetrating the cable.
After the cable is cut the pressure indicated by the pressure gauge drops significantly. The
pump must be continued to be actuated until the max. operating pressure is reached and the
relief valve is activated. The max. operating pressure is the highest pressure which can be
reached in the system. An increase of pressure is limited by the release valve.
The cutting cycle is terminated now and the cable is cut. The blades (Pos.-No. 12) will be
returned into their starting position by actuating the release lever (Pos.-No. 6).
4.3. Description of the connecting devices
The connecting devices stand for a detachable connection between the pump and the
insulating hose. They consist of a female and a male coupling which can be engaged or
disengaged and present in the engaged state a pressure prove, leakage free connection.
4.4. Description of the cutting procedure
With cable cutter heads in the scissors style the two blades (Pos.-No. 12) move towards
each other on a circular path towards the cable.
The cutting head (Pos.-No. 11) must be positioned in an angle of 90° towards the cable in
order to avoid undesired shearing forces. The cable must be fed between the open cutting
blades.
In the slow working speed the blades penetrate the cable. The pressure pick-up happens as
described in the previous chapters.
5. Remarks in respect of the determined use
It is mandatory according to German law BGV A3 §6 Cl.2 that the line is made and
maintained inactive during maintenance.
Since determining a live state of a cables, especially earth cable, is not always possible
alternatively the live line status can be verified by cutting the cable with this safety cutting
unit. At the same time the net provider should be contacted.
The portable cable cutting unit type SSG serves to check cables whether they are live or
not and to cut stranded copper and Aluminum cables and conductors with a nominal
voltage of max. 60 kV and a nominal frequency of 60 Hz where it can not be determined
whether they are live without any risk for the operator. (see EN 50110-1 Abs. 6.2.3) Single
core cables up to a maximum of 110 kV and max. 60 Hz can also be cut in combination
with organisational measures which take into account the special conditions which must be
observed when cutting single core cables.
Do not disregard the safety instructions supplied in the German standard DIN VDE 0105
part 100 Chapter 9.
