ADDENDUM TO THE
USER MANUAL
PARTIAL DISCHARGE MEASURING SYSTEM LDS-6 / DC
Made in Germany
Version: 01-07 (January 2007)
LEMKE DIAGNOSTICS GmbH
Radeburger Str. 47
D - 01468 VOLKERSDORF
Telephone +49/35207 863-0
863-11
Telefax +49/35207
Table of Contents
1.HARDWARE (2)
1.1.DC P ROCESSING U NIT (3)
1.2.C ONNECTING THE LDS-6DC U NIT (5)
2.SETUP (6)
3.CALIBRATION (7)
3.1.C ALIBRATION AND M EASUREMENT W INDOW (7)
1.Hardware
1.1.DC Processing Unit
Fig. 1: DC Unit
1 – BNC In Jack “DC Input”
-15 … 15V DC input signal, will be sampled by an ADC and displayed in the LDS-6 Software.
2 – hole for voltage adjustment
by using a fine screw driver, an adjustment of the dynamic range is possible.
3 – LED indicator “DC”
Shows the status of the processing unit.
-Dark: the DC unit is switched off
-Bright: the DC unit is working
Technical Data:
Input range -15V (15)
DC coupling
Communication I²C
Bus Gain 1:1 and 1: 4
Input resistance 1MOhm
Fig. 2 :Signal Flow DC Unit
Fig. 3: internal Connection
1.2.Connecting the LDS-6 DC Unit
The equipment connection is equal to PD standard testing. The difference is the direct connection of the HV DC source with the input of DC Unit by using a resistance divider.
The input level of the DC Unit is –15V….+15V.
Fig. 4: Measurement Setup
For example, the red input of the measuring impedance LDM-5/U or LDM-5 is connected to the bushing tap (low voltage side) of the coupling capacitor. The ground (black jack or ground bar) is connected to the DC Test objekt housing near the bushing. The Voltage Output jack of the LDM-5/U and the Voltage Input Jack of the LDS-6 are not used.
A 50Ω coaxial cable (RG-56/U) connects the LDM-5/U PD Output directly with the PD Input Jack of the LDS-6 Input Unit. The second 50Ω coaxial cable (RG-56/U) connects the DC Unit Input Jack directly with the DC Divider (Resistive Divider)
NOTE:
The recorder X Output works useless in the DC- Mode
2.Setup
Fig. 5: Setup
After entering of the password in the password panel, the “Advanced“ button in the is available. By pressing the “Advanced“ button, the window like Fig.5 will be displayed. In the DC Tab, select the “DC Mode enabled” check box.
The “time interval” control means the time interval (frequency) for communication over an OLE port with
separate programs, like LDSX.
