Applicable for transformer to submit the dc resistance testproject around group in pick up and overhaul project
Dc resistance measuring instrument is an indispensable test project for transformer after handing in pick up, overhaul and change sub-pick up switch. Through measurement transformer, pick up or pick upquality of outgoing line can be checked by winding dc resistance of group, whether there is short-circuit or open circuit between turns of winding group, and whether pick up contact of sub-pick up switch is good, etc. QJ44 double-arm electric bridge was used to measure the direct resistance in the past, and the measurement rementcurrent of this type of electric bridge is milliamps, so the measurement time is very long and the precision is low. In order to change this situation, shorten measurement time and reduce work burden of test staff, our company developed Dc resistance measuring instrument.
Dc resistance measuring instrument is a high precision successor to Dc single - armed bridge. Instrument adopts advanced switch power supply technology, and its measurement speed is more than 100 times faster than the bridge. The show part consists of 4-1/2 LCD LCD showmeasurement results, 3-1/2 LCD LCD showenvironment temperature or testcurrent value. It overcomes the disadvantages of other similar products, such as LED show value inconvenient reading in sunlight, and has the automatic arc extinction function. Dc resistance measuring instrument has the advantages of fast measuring speed, high precision, direct show, strong anti-interference ability, small size, low power consumption, stable and reliable testdata, free from human factors and so on. Instrument contains rechargeable battery group (14.8v), crossover and dc dual-purpose, convenient for scene and field test.
Dc resistance measuring instruments conform to the requirements of D/LT 845.3-2004 general technical conditions for resistancetest devices - part 3.
product names：Dc resistance tachometer、 Transformer dc resistance test instrument、 Transformer direct resistance speed meter、 Transformer direct resistance quick test instrument、Inductive load Dc resistance tachometer、Inductive load dc resistance rapid test instrument、Inductive load dc resistance test instrument、Dc resistance measuring instrument
|Conditions of use||environment temperature||0℃～40℃|
|Measuring range||seven range||1μΩ～20mΩ|
|Constant current source||1A(1μΩ～20mΩ、20mΩ～200mΩ、0.2Ω～2Ω)|
|quality||5kg（Including test clamp and test line）|
1.The appearance of the product shall be subject to the actual product，Technical parameters with model if there are any changes，without notice。In case of misappropriation or copying, legal liability will be investigated.
1、Test fast: Dc to hold measuring instrument maximum charging current can be up to 1 a, when the measurement is effective to compensate large inductance equipment current inertia, It accelerates the core saturation, thus shortening the charging time and improving the test speed, It is hundreds of times faster than traditional instrument single and double arm bridge
2、High accuracy: in addition to adopting the advanced four-terminal measurement method, Dc resistance measuring instrument also adopts the advanced constant-current power supply technology, which keeps the current charging of inductive load at a relatively stable value, stable sense resistance and strong anti-interference ability, thus ensuring the measurement accuracy. Besides, high-quality components imported from abroad are adopted, with high measurement result accuracy and good repeatability
3、Measuring range wide： resistanceMeasuring range for1μΩ～20kΩ， range wide
4、Crossover dc dual purpose: dc resistance measuring instrument comes with rechargeable battery group, crossover dc power supply, portable design, easy to use and carry
Enterprise products in strict accordance with international and national standards and rules of industry production, through the national, provincial and municipal electric power research institute and electric power authorities detection, measuring center, fully passed the ISO9001 international quality management system certification, the licence for manufacturing measuring instruments of the People's Republic of China, GB/T19001-2016 quality management system requirements, GB/T24001-2016 environmental management system requirements, GB/T28001-2011 occupational health and safety management system requirements.