There are two possibilities: 1. Your test pen is inductive (with an amplifier circuit and comes with a button cell as a power source). This type of test pen is inaccurate and the diode measuring the neutral line also emits a signal. loud noise. If you use a digital test pen and it shows more than ten volts, it doesn't matter. This only proves that the resistance of your earth is high. 2. There is a problem with your ground wire (short circuit or excessive ground). You place one end of the multimeter on the neutral line and the other end in a damp spot on the ground to see what the voltage is between the neutral line and ground. You can determine where the problem is.
Is it dangerous if the hot and neutral wires of a small single phase generator are reversed?
I think I can understand it according to your idea
It is true that the generator emits. Electricity does notdoes not need to be connected to the electrical network and it is not necessary to distinguish neutral and live wires.
In addition, if the output end of the generator is not connected to the earth, there will be no distinction between neutral and live wires. This 220 V can be considered as Look at the line voltage.
But it may be a habit developed by old electricians. I think I should respect others and pretend to be cool.
Just for fun, grab an extra electric test pen and click. on it twice, that way that other person can feel comfortable and your work can be done without a problem. Obviously this person's technical affairs are very bad, so there is no need to compete with him.
How to connect the capacitor when converting a single phase motor into a generator, please ask for a circuit diagram (?^?╬)
There is no danger if the live wire and neutral wire of a small single-phase generator are connected in reverse. It doesn't matter, it's all 220V when it comes out in the one-zero-one fire circuit, it's called a single-phase circuit and in single-phase household appliances. Mechanical electricity, there is no distinction between zero and fire. Just distinguish the ground wire. This is the generator output only. The neutral line can be electrified (the neutral line of the national electricity network is not electrified). It may be dangerous to touch it with your hands. Please pay more attention when installing it.
A generator with only one live output terminal and one neutral terminal is called a single-phase generator.
Single-phase generators are intended for generators in electrical systems (thermal power plants, hydroelectric power plants, nuclear power plants, etc. in the electrical network). The genElectrical system drivers all have a “three-phase, four-wire” output. That is to say three live wires and a neutral wire. The three live wires are defined as “A”, “B” and “C” respectively. The output voltage and capacity of the three phases are the same, but the phase difference is 120°.
Single-phase generators are generally only used as backup power sources to provide lighting, appliances, etc. to domestic users.
Generators and motors are completely reversible. When the rated voltage is applied to the stator windings of generators and motors, the external force rotates to rotate the rotor of the generator or motor; reach At rated synchronous speed, the stator will generate voltage and produce electricity.
Simply because the design is focused, using a generator instead of a motor or wordelectric eur instead of a generator, the efficiency is less than 70% of the nominal value, so it is generally not replaced, and will only be chosen for small capacities.Choose instead.
If a single-phase motor is connected to a starting capacitor and the load is resistive (electric oven, incandescent lamp, etc.), it is not necessary to connect the capacitor in parallel. The rotor can generate electricity when activated. reaches the nominal speed.Single-phase motors do not have a starting capacitor or the load is inductive (transformer, motor, etc.). When a capacitor is connected in parallel between the live wire and the neutral wire, electricity can be produced. generated when the rotor reaches nominal speed.
Single-phase motors do not need a starting coil and can generate electricity by connecting the starting capacitor between the live wire andt the neutral wire. This is the wiring diagram of a single phase single capacitor motor Add a capacitor between the live and neutral wires to generate electricityChange the excitation capacitor into the live and neutral wires
Otherwise, as shown in the figure, when the rated speed is close to the rated speed, connect dry batteries to both ends of the auxiliary winding and touch them repeatedly to start the excitement and increase the tension. .