6
Overview
DC resistance measurement of transformer winding is an essential
test project during transformer transfer, repair and changing tapping
switch.Measuring DC resistance of transformer winding, you can check
out weld or connection quality of down-lead, the winding inter-turn
short circuit or open circuit, and whether tap-changer is well contacted.
In the previous it is generally to use QJ44 double bridge to measure DC
resistance, but the measuring current for this type of bridge is mA level
current. So measurement will take a long time, and accuracy is lower. In
order to change the above situation, our company has developed
HTZZ-1A DC Resistance Rapid Tester.
This instrument is a high-precision regeneration product used to
replace DC single/double bridge. Equipped with advanced switch power
supply technology,the measurement speed of the instrument is faster a
hundred times than that of the bridge. Using four and half bits LCD to
display the measurement results and three and half bits LCD to display
ambient temperature or test current value, it overcomes the
shortcoming of other similar products that it is difficult to read value
from the LED display in the sun and possesses automatic arc
suppression function. The instrument is characterized by fast test speed,
high precision, intuitive display, strong anti interference ability, small
size, low power consumption, stable and reliable test data. Built-in
rechargeable battery pack (12V) and AC/DC dual-use, the instrument is
very convenient for on-site and field test.
The instrument meets DLT 845.3-2004 "resistance measurement
device general technical requirements- Part 3 DC Resistance Tester"
requirements.