Megger DELTA 4000, Справочное руководство

Страница: 8 / 48

8 DELTA 4000 ZM-AH02E
1 INTRODUCTION
Connections for UST/GST
Configurations
DELTA 4000 supports two basic groups of operation, GST
and UST mode. GST stands for grounded specimen test
while UST stands for ungrounded specimen test. Within
the two groups the test set can be operated in seven test
modes as summarized in Table 1.1. Measurements are
always made between the high-voltage lead and the lead/
connection in the measure column.
Table 1.1
DELTA 4000 test modes and internal measure-
ment connections
UST: Ungrounded specimen testing
Test mode Measure Ground Guard
UST-R Red Blue –
UST-B Blue Red –
UST-RB Red and Blue – –
GST: Grounded specimen testing
Test mode Measure Ground Guard
GST-GND Ground Red and Blue –
GSTg-R Ground Blue Red
GSTg-B Ground Red Blue
GSTg-RB Ground – Red and Blue
In UST test mode, Ground and Guard are internally
connected. Internally the Red and Blue leads are either
connected to be measured or connected to Ground (and
Guard).
In GST test modes the current returning from Ground is
measured. Internally the Red and Blue leads are either con-
nected to Ground or Guard to be included in or excluded
from the measurement.