Nasıl yapılır ölçüm ct polarite ile multimetre
Nasıl yapılır ölçüm ct polarite ile multimetre
Akım transformatör% 2c CT% 3a Elektromanyetik akım transformatör yaygın olarak kullanılan güç sistem% 2c ve onun çalışma prensibi benzer bu transformatör benzerdir transformatör.
The özellikleri of current transformer are follows: (1) The primary coil is connected in series in the circuit with few turns, so the current in the primary coil depends complete on the load current of the circuit to be tested, but has nothing to do with the secondary current; (2) The empedance of the current coil of the instrument and relay connected to the secondary coil of the current transformer is very small, so under normal conditions, the current transformer runs in a near short-circuit state.
The oran of birincil ve ikincil derecelendirilmiş akım akım transformatör is the the derecelendirilmiş karşılıklı endüktans oran of akım transformatör: kn=I1n/I2n.
Çünkü the rated current I1n of the primary coil has been standardized and the rated current I2n of the the secondary coil is unified to 5(1 or {0.5) A, the the rated mutual inductance ratio of the current transformer has also been standardized. Kn can also be approximately expressed as the turns ratio of the primary and secondary wrapings of the transformer, that is, where kn≈kN{% 7b6}}N1/N2 is the number of turns of the primary and secondary wrapings.
The fonksiyon of akım transformatör is to measure göreceli büyük akım.
Genel olarak konuşma, eğer siz isteyen ölçmek tek 400A, ne yapmalı siz yap onsuz a 400A watt-saat metre? Bu nedenle, siz kullanmalısınız a akım transformatör to değişim a büyük akım içeri a küçük akım ve giriş it into the watt-saat metre. The transformer has a variable ratio, for example, 200/5 is 40 times that of the watt-hour meter, which means that your watt-hour meter has oldu şarj edildi bir kez. Gerçek% 2c siz kullandınız 40 derece elektrik% 2c ve orada var birçok seviye transformatörler% 2c ile 15% 2f5.
For the field, the best way to determine the polarity of the transformer is to use a dry battery and a piece of pointer multimeter MF47. With wires, it is the most direct and easy to see, and the accuracy can reach more than 90 percent . The method is very simple. The standard secondary transformer with P1 P2 on the primary side is S1S2 K1K2, etc. Connect the positive electrode on the secondary side of P1 to the negative electrode of S1, and the secondary side is directly connected. Then directly short-circuit the DC current to the primary side of the transformer with the battery. At this time, you will see that if the pointer swing of the multimeter is extremely positive clockwise, it is negative counterclockwise, indicating that the internal winding is wrong. At this time, you should observe it in detail. Because the pointer swing is not large, it is advisable to use two 1# batteries in the same way, because it is too dangerous to have too many batteries, and stop for half an hour or replace the batteries after about 10 tests. Because the battery was very hot during the test, it is suggested that you should not be lazy to use the 126V converted from alternating current because you saved the battery, but the error increased and the safety decreased.
