KYORITSU KEW 3127, Инструкция по эксплуатации

Страница: 31 / 60

－ 28 －
Setting procedures
Follow the procedures below.
[Stand-by state]
ENTER button( )
Setting of Step time (with UP/DOWN button( ))
ENTER button( )
Setting of Breakdown/Burn (with UP/DOWN button( ))
ENTER button( )
Setting is finished.
6-7 DD Measurement (Dielectric Discharge)
This measurement method is usually used to diagnosis multi-layer insulations,
which requires the instrument to measure the discharge current and capacitance
of the measured object 1 min after the removal of the test voltage. This is a very
good diagnostic insulation test that allows deterioration and other problems voids
in the multiple insulations to be assessed.
=
Current value 1 min after completing
measurement (mA)
Voltage value when a measurement
Complete (V) x Capacitance (F)
Dielectric
Discharge
DD 2.0 or less 2.0 - 4.0 4.0 - 7.0 7.0 or more
Criteria Good Warning Poor Very Poor
This criteria is a guide and could be slightly changed and be adapted to particular
objects under test based on practical experience of the users. This method has
been established to test high voltage generators installed in electric power plants
in the Europe countries.