S-50 DC
● S-80 DC ● S-110 DC ● S-120 DC – USER MANUAL
6
2.2
Functionality
Before the set can be used, the operating unit and high-voltage unit have to be grounded
properly.
When the high-voltage adjuster is set to zero, the test voltage can be switched on at the
press of a button and increased continuously between 0 V and the nominal voltage. This
voltage is generated in the high-voltage unit using transformers with rectifiers connected in
outgoing circuit.
The condition of the test object with regard to electric strength and insulation quality can be
determined from the values for test voltage and leakage current displayed on the operating
unit.
When testing has been completed, the test object is discharged and short-circuited with the
grounding and discharge rod.
2.3
Application
The S-50 / 80 / 110 / 120 DC is used for electrical testing of power cables and plant with direct
voltage. Areas of application include:
testing at re-commissioning of cable systems after maintenance and repair,
testing of newly installed cables an cable joints before commissioning,
voltage testing at cable sheath,
regular cable testing,
testing of electrical equipment.
The following test voltages are recommended by HD 621 S1 for testing with direct voltage:
Nominal voltage U
0
/U [kV/kV]
3.6/6
6/10
12/20
18/30
20.8/36
DC test voltage [kV]
20…29
34…48
67…96
76…108
87…124
WARNING
Owing to the high voltages which occur, special safety measures are required.
These are explained in later sections of the manual (see also sec. 1).
The digital meters only work when the tester is powered on. In the
case of power loss check with external test equipment, if the device under test
is charged. Alternatively connect the tester to a working power supply or dis-
charge the device under test with the ground and discharge rod.
