Description
Testing DC resistance of transformer
winding is very important testing item, in (Electric equipment
testing regulation), it ranks at number 2 out of all transformer
testing items, (regulation) defines that transformer
replacementã€big repair, slight repair, change joint location,
error examination and pre-test and so on, must test DC resistance
of transformer winding. The purpose is:
â‘ check the weld
quality of wire and down-lead inside winding,
â‘¡check if conjunction is
good on each location of sub-switch,
â‘¢check if winding or
down-lead have broken trace or not,
â‘£check the correctness of
parallel branch, if have one or many broken locations of several
parallel wires-wound windings.
⑤check if have bridge
phenomenon during layers, windings.
Interface design of the instrument
adopts microcomputer control, big LED screen backlight display,
easy operationã€kind and clear human-machine interaction
interface, reminding of measurement process and instrument working
status is clear and enough, do not need to remember many
regulations; use the current supply linearity compensation
technology, stable testingã€high accurate measurementã€fast
speed，improve efficiency of testing, alleviate working intensity
of workers. Adopt \'4 ends\' measurement technologically, eliminate
measure tolerance caused by down-lead resistance and connection.
Have over-voltage projection function and prevent
counter-electromotive force impact. Panel printer can quick print
measurement result (optional). Small site, light weight, easily
hand / carry.
This instrument is used as inductive
low resistance measurement and analysis for electric
transformerã€transformer winding and so on.
Features:
1, microcomputer control, big
LED screen backlight display
2, easy operationã€kind and clear
human-machine interaction interface, reminding of measurement
process and instrument working status is clear and
enough
3, noneed to remember many
regulations; use the current supply linearity compensation
technology, stable testing, high accurate measurement, fast speed,
improve efficiency of testing, alleviate working intensity of
workers.
4,Adopt \'*-terminal\' measurement
technologically, eliminate measure tolerance caused by down-lead
resistance and connection.
5, Have over-voltage projection
function and prevent counter-electromotive force
impact.
6, Panel printer can quick print
measurement result (optional). Small site, light weight, easily
handcarry.
Parameters:
|
Type-parameter
|
ZRB*3
|
ZRB*5
|
|
Test range
|
**2kΩ
|
**2kΩ
|
|
Test current
|
3A(*0mΩ～2Ω)
0.3A(*0Ω)
0.*3A(**0Ω) , 0.**3A(***0Ω)
|
5A(*0mΩ~**0mΩ)
2A(2Ω)
0.2A(*0Ω)
0.*2A(**0Ω)
0.**2A(***0Ω)
|
|
Resolution
|
1μΩ(*0Mω gear), *0μΩ(**0mΩ gear),
0.1mΩ(2Ωgear)
1mΩ(*0Ωgear), *0mΩ(**0Ωgear),
0.1Ω(***0Ωgear)
|
|
Accuracy
|
±0.2 %±2 words
|
|
Working power
|
*4.8V/2.2Ah lithium-ion rechargeable
battery
AC**0V *0 Hz (±*0 %)
|
|
Withstanding voltage
|
AC1.5kV *0Hz 1min
|
|
Working temperature and humidity
|
0℃～*0℃, ≤ *5 % RH
|
