1.One time wiring, capable of completing DC resistance testing and transformer turns ratio tester.
2.Direct resistance testing function, for Yn type, Y type, and △ type windings, three-phase automatic testing can be used, and the three-phase imbalance rate can be calculated; The maximum output current is 20A, which can meet the testing of extremely low resistance values of low-voltage coils in distribution transformers.
3.Transformer ratio testing function, with testing functions for three-phase, single-phase, and Z-type transformers; PT/CT ratio and polarity testing functions; Blind testing function.
4.It has multiple wired and wireless communication interfaces, which facilitate the expansion of instrument functions.
5.The instrument adopts an embedded Linux operating system, which has high security, smoothness, and ease of use.
6.The instrument adopts an A7+M4 dual core architecture, which meets the real-time measurement requirements and smooth operation.
7.This instrument is powered by a large capacity lithium battery and comes with a built-in charger.
Product Introduction
For the power system, transformers are the core equipment in the system, so the long-term and reliable operation of transformers is related to the stability and reliability of the entire system.
At present, the DC resistance test and transformer ratio group test of distribution transformers are necessary tests for transformer power outage maintenance. To complete the above tests and operations, it is necessary to separately configure transformer DC resistance tester and transformer voltage ratio tester. Two types of instruments need to be carried during each test.
Our company has innovatively developed a two in one distribution transformer testing system (transformer turns ratio resistance) powered by large capacity lithium batteries. We only need one set of equipment to complete the testing of two projects without frequent disassembly and connection of testing wires.
Product Parameter
|
Direct resistance test |
|
|
Output current |
20A, 10A, 5A, 1A, 0.1A, ≤10mA |
|
Model |
JH2845 |
|
Measuring range |
20 A: 0.5mΩ～100mΩ 10 A: 1.0mΩ～300mΩ 5A: 10 mΩ～1.0 Ω 1A: 200mΩ～6.0 Ω 0.1A: 2.0 Ω～60 Ω ≤10mA: 30 Ω～50 kΩ |
|
Accuracy |
± (reading x 0.2%+2 words) |
|
Transformation ratio test |
|
|
Measuring range |
0.9～10000 |
|
Accuracy |
± (reading x 0.1%+2 words) (less than or equal to 500) ± (reading x 0.2%+2 words) (greater than 500 but less than or equal to 3000) ± (reading x 0.3%+2 words) (greater than 3000) |
|
Resolution |
0.9～9.9999(0.0001) 10～99.999(0.001) 100～999.99(0.01) 10000 or above(1) |
|
Usage conditions and appearance |
|
|
Working power supply |
Built in lithium battery with a capacity of 7.8AH |
|
Charging voltage |
AC220V |
|
Operating temperature |
-10℃～50℃ |
|
Relative temperature |
≤ 90%, no condensation |
|
Weight/Size |
6.5kg/318×280×204mm |
Product Accessories
- A set of dedicated test leads (red, yellow, green, black)
- Three rolls of printing paper
- A power cord
- Three spare fuses
Prodect Qualification
Deliver, Shipping and Serving
FAQ
Q: For Yn, Y, and △ type windings, how does the instrument realize three-phase automatic testing of DC resistance, and what is the basis for calculating the three-phase unbalance rate?
A: After selecting the corresponding winding type in the menu, the instrument will automatically switch the test channel to complete the three-phase DC resistance measurement in sequence. The three-phase unbalance rate is calculated automatically by the instrument based on the measured three-phase resistance data and industry standard algorithms, without manual calculation.
Q: Does the instrument support the turns ratio and polarity test of PT/CT? What is the "blind test function" used for?
A: Yes, it is equipped with dedicated test functions for PT/CT ratio and polarity. The blind test function allows the instrument to automatically identify the turns ratio and connection group of the transformer without manually inputting the standard parameters of the tested transformer, which is very suitable for on-site testing of unknown transformers.
Q: The instrument is powered by a 7.8AH lithium battery. Can it complete a full set of DC resistance and turns ratio tests for multiple transformers on a single charge?
A: Yes. The large-capacity 7.8AH lithium battery has strong endurance. It can fully support the continuous testing of multiple distribution transformers. In addition, the built-in charger allows for convenient on-site charging with AC220V power supply when necessary.
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