Applicable for transformer to submit the dc resistance testproject around group in pick up and overhaul project
Transformer's dc resistance test around group is an indispensable test project for transformer after handing in pick up, overhaul and change sub-pick up switch. Through measurement transformer to coil the dc resistance of the group, the quality of the outgoing line's pick up or connected pick up can be checked, whether there is a short-circuit or an open circuit between turns when winding the group, and whether the 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 accuracy is low. In order to change this situation, shorten measurement time and reduce the work burden of test personnel, our company developed Dc low resistance test instrument.
Dc low resistance test instrument is a high-precision replacement product of Dc single-arm and double-arm electric bridge. Instrument adopts advanced switch power supply technology, and its measurement speed is more than 100 times faster than the electric bridge. The measurement result is displayed in the display part by four-and-a-half LCD liquid crystal, and the environment temperature or testcurrent value is displayed in three-and-a-half LCD liquid crystal. The instrument overcomes the disadvantage of other similar products that are inconvenient to readin sunlight by LED display value, and has the automatic arc extinction function. Dc low resistance test instrument has the advantages of fast measurement speed, high precision, intuitive display, strong anti-interference ability, small size, power saving, stable and reliable testdata, free from human factors and other advantages. Instrument contains rechargeable battery group (14.8v), both ac and dc, convenient for scene and field test.
Dc low resistance test instrument meets the requirements of DL/T 845.3-2004, general technical conditions of resistance measurement device, part 3, Dc resistance test instrument.
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 low resistance test instrument
|Conditions of use||environment temperature||0℃～40℃|
|Measuring range||seven range||1μΩ～20mΩ|
|Constant current source||2A(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、The Test fast speed: Dc low resistance test instrument maximum output charging current can reach 2A, measurement can effectively compensate current inertia of large inductance equipment, It accelerates the core saturation, thus shortening the charging time and improving the test speed is faster than the traditional instrument for single, double bridge hundreds
2、High accuracy: Dc low resistance test instrument not only adopts advanced four-terminal measurement method, but also adopts advanced constant current power supply technology, so that current charging of inductive load is kept at a relatively stable value, with stable resistance ability and strong anti-interference ability, thus ensuring measurement accuracy. Besides, high-quality components imported from abroad are adopted, with high measurement result accuracy and good repeatability
3、Wide Measuring range: the resistance Measuring range is 1 mu Ω Ω ~ 20 k, the range is wide
4、Deliver dc dual-use: dc low resistance test instrument is attached with rechargeable battery group, deliver 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.