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2022-07-25 09:58:18 360
We know that it is very dangerous to open the secondary circuit of current transformer. Why do you say so? We can see this in terms of the danger it presents.
If the secondary circuit is open, the risk is shown in the following aspects:
1, the current of the secondary side is unbalanced, leading to a significant increase in the magnetic flux of the core, and the induced electromotive force is proportional to the magnetic flux, causing a significant increase in the voltage of the secondary side, which is easy to bring the danger of electric shock, and even lead to the breakdown of the insulation part of the circuit and components of the secondary side.
Right NOW, iron heart CAN HAVE APPARENT SYMPTOM TO SHOW, GIVE OUT for EXAMPLE DISCHARGE sound, APPEAR ELECTRIC SPARK, give OUT NOISE TO WAIT.
2. After the core magnetic flux increases significantly, the temperature of the core will increase significantly, so that the voltage transformer will be burned. If this happens, we will find that the transformer will smoke and have a burnt smell.
3. Due to the greatly increased magnetic flux, the core appears to be saturated, so there will be a large amount of remanence, resulting in a significant reduction in the accuracy of the transformer.
4. The current of the secondary side is zero, and the power meter and ammeter display is also zero. The aluminum disk of the electricity meter will not rotate and make noise, and the current relay cannot operate normally, so the protection and monitoring of the primary side circuit cannot be realized.
It can be seen that the transformer should avoid the open secondary circuit, otherwise it may cause dangers and accidents.
In addition, in order to enable the voltage transformer to play its due role, the specified items should be tested and checked before being formally put into use to ensure that the check is correct before use.
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