When checking with the electroscope pen, the electric pen glows, which means that the circuit must be electrified. Why is this sentence wrong?
The glow of the electroscope (electric pen) can indicate that there is a voltage (above 60V) to the ground, but it cannot indicate that there must be a current. Generally speaking, there is electricity, which means that there is current passing through the line, because the load can only work when there is current.
There will be induction electricity in the circuit, and the neon bulb of the electroscope pen will emit light as long as the voltage exceeds a certain range, so the light emission of the electroscope pen is not necessarily caused by the electricity in the circuit, but may also be induced electricity. Moreover, some electrical appliances will have induction electricity and will cause the electroscope pen to light up.
1. Before using the electroscope pen, first check the electroscope pen to ensure that the function of the electroscope pen is normal. We can run a test on a known power source to see if the neon bulb glows. We also need to check whether the electroscope pen is damp or ingress of water to ensure our own safety.
2. Before using the electroscope pen to enter the electric field test, check whether the voltage of the place is suitable. Don't try to test the voltage higher than the applicable range with a test pen, in order to avoid danger.
3. When using the electroscope pen, do not touch the metal probe at the front end of the electroscope pen to avoid electric shock accidents; when using the electroscope pen, be sure to touch the metal sheet or metal hook at the end of the electroscope pen. If this is not done, although the neon bulb of the electroscope pen does not emit light, because the electrified body, the electroscope pen, the human body and the earth do not form a circuit, it cannot be correctly judged whether the electrified body is charged, and a misjudgment will be very dangerous.
4. When using the electroscope pen under bright light, we must pay special attention to judging whether the neon bubble of the electroscope pen is really bright. Many accidents are caused by careless misjudgment, and we must avoid this.
5. It is best to wear insulating shoes when using the electroscope pen to prevent problems before they happen.
6. When judging the same-phase electricity or out-of-phase electricity, you must remember that the two feet must be insulated from the ground. Hold a pen with each hand to test, whether both pens are bright or only one is bright, it is the same. If it is not lit, it is in-phase electricity, as long as it is illuminated, it is out-of-phase electricity.
7. When using an electroscope pen to test high-voltage equipment, first of all, the operation monitoring system must be strictly implemented. While someone is operating, one person is monitoring. The operator should be in the front and the guardian should be in the back. When using the electroscope pen, we must pay attention to the adaptation of the rated voltage and the voltage level of the electrical equipment under test.
8. During the electrical inspection, the operator must wear insulating gloves and insulating shoes to prevent contact voltage from harming the human body. The operator must first check the electroscope pen on the live equipment. When carrying out live inspection of multi-layer lines, it is necessary to test the low voltage first, and then test the high voltage, first the upper layer and then the lower layer.
