5 Connection Up to the TD / TD-MC Instrument
26
DHV0075 b2 EN
©
b2 electronic
gmbh
5
Connection Up to the TD / TD-MC Instrument
Safe operation requires strict adherence to the recommended grounding
procedures. The TD measurement system hook-up to a cable or other electrical
apparatus requires three connections. It is important that these connections are
made correctly, securely and in the correct sequence. The TD / TD-MC is a
measurement device and it and the DUT (Device under Test) are energized by the
HVA VLF high voltage power source. The TD / TD-MC does not itself generate
any High Voltage, but it does operate at the voltage applied to it by the HVA HV
power supply. Therefore always treat the TD / TD-MC as the same voltage
potential as HVA power supply “feeding” it. In addition make sure that all safety
precautions and requirements are adhered to for the HVA test instrument – see
HVA instruction manual.
The
Ground Cable
of the TD / TD-MC should be connected to the station ground.
In the case of a cable this can be the concentric neutral / ground shield / ground
wire. The cable ground must be connected to the station ground for testing
purposes and SHOULD NOT be isolated from ground.
The
HV Test Lead
is a coaxial conductor made up of the center high voltage
conductor and an outside Shield Return that should remain at ground potential.
The return shield is internally connected to ground in the HVA via this HV plug and
a separately grounded connection inside of the TD system. Connect the HV Test
lead of the TD / TD-MC to the HVA test instrument by screwing in the HV plug.
Make sure the plug is securely screwed into the HV socket and then connect the
TD / TD-MC system to the DUT using one of the versatile connectors. The
connection of the TD / TD-MC system to the DUT should be the last connection
made before a test is commenced and it should be the first one removed after a
test has been performed and it should be independently verified that there is no
longer voltage present at the TD / TD-MC.
