ALH-0.66 series transformer FAQ

Create Date: 2024-8-30 12:03:23|Source: APT/Siemens Shanghai Ergong

1. What is the maximum voltage that can be used for an ALH transformer?

AC low voltage up to 720V

2. Is there a protective grade product for ALH transformers?

II-P AND III-P are available in both protective grades

3. What is the maximum primary current of ALH transformer?

The maximum primary side current is 8000A

4. Is an open circuit allowed on the secondary side of the transformer?

It is strictly forbidden to open the road on the secondary side

5. What are the common accuracy of the measurement transformers produced by our company? level

There are five levels: 0.2S, 0.5S, 0.2, 0.5, and 1

6. What is the difference between accuracy class with S and without S?

0.5S and 0.2S are generally used for measurement grade, and 0.5 and 0.2 are generally used for measurement grade

7. What is the maximum primary side current that the measurement-grade transformer can detect

1.2 times the rated current

8. What is the implementation standard of our transformer?

The latest national standards GB20840

9. What is the meaning of transformers P1 and P2 and S1 and S2?

P1P2 is the primary polar end, S1S2 is the secondary polar end, and P1S1 and P2S2 are the eponymous ends. Generally, P1+P2-, if P1P2 wiring is reversed, then the corresponding S1S2 is reversed.

10. What altitude can the transformer be used for?

According to GB20840.2-2014, it can be used at an altitude of 1000m, and can be used for capacity reduction above 1000m

11. Will on-site vibration affect the use of the transformer?

According to the national standard, vibrations or minor earthquakes caused by external causes can be ignored

12. Why does the transformer not provide the secondary winding resistance parameter?

It is a confidential parameter and will not be released to the public

13. When the distance between the transformer and the ammeter is long, how to select the transformer?

Calculated according to line distance, ammeter power, transformer capacity

14. What is the insulation grade of the transformer produced by our company?

Meet the requirements of the national standard: E grade, 120°C

15. What are the types of open transformers?

　　HK NK SK

16. Which type of open current transformer belongs to the fully open and closed structure?

　　NK

17. What is the aperture coverage of SK series open current transformers?

　　6——46

18. Which current transformer adopts integrated TVS technology?

　　SK

19. Which specification of current transformer insulation class B?

　　SK

20. What is the minimum secondary side current of SK series open current transformer?

　　2.5mA

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