The unit current is unstable. Master electrician, please point me in, thank you. 60

It means that the power supply capacity of the unit is sufficient, not the problem of insufficient power supply capacity. Whether there is a large capacity capacitive or inductive load that is in intermittent operation, if there is a possibility. Or somewhere the insulation is not very good, and there is thermal breakdown. Then there is the possibility of poor grounding.

It is not the cause of the current, because the terminal resistance does not change, and the voltage does not change. The problem is in the voltage! Check whether the contact points of the power distribution panel are good, and whether there is heat and ignition?

To be overhauled without power outage, polish each connecting line and contact point. Also to see if the three-phase current is balanced?

Haha, it's possible that it's overloaded... The swaying power distribution screen, maybe it's the compensation cabinet, looks like this... There are many solutions: 1. Expand the transformer.

2. Add a voltage regulator.

The key is to determine if it is a compensation cabinet... Ha ha.

It may be caused by the loss of the high-voltage capacitance of the transformer, and it is not recommended that you repair it personally.

Exclude the inspection, first disconnect the load side, measure the low-voltage side of the transformer, if it is normal, the low-voltage load is put into observation one by one, you need to find the fault outlet, if the low-voltage side of the transformer is not normal, then it is best to detect the transformer.

Check the terminals of the neutral wire for loose wiring and tighten them.

You can use the commutation switch to judge... If the other two phases are stable, then there is something wrong with one of the phases ... Hopefully then you can be enlightened ... Ha ha.

The two upstairs have a point, but there are a lot of other original sounds, such as other high-power equipment shared with the line in your door, and it is recommended that you find a professional electrician to see at least the money to burn something less to find an electrician. Yes.

Fundamentals of Circuit Repair:

1. Power supply circuit: It is composed of battery, generator and voltage regulator and working condition display equipment, etc., and its main task is to supply power to all electrical equipment in the whole car and maintain the stability of power supply voltage.

2. Starting circuit: composed of starter, starting relay, starting switch and starting protection device, etc., its main task is to transform the engine from a static state to a self-running state.

3. Ignition circuit: composed of distributors, electronic ignition controllers, ignition coils, spark plugs and ignition switches, etc., its main task is to control and produce the voltage of the spark plug electrode gap in the ecological air space enough to break through, and at the same time send high-voltage electricity to the spark plugs in the chamber of each cylinder according to the working order of the engine.

4. Air conditioning control circuit: It is composed of an electromagnetic clutch of an air conditioning compressor, an air conditioning controller, a control switch and a fan control circuit.

5. The instrument circuit is composed of instruments, indicator tables, sensors, various alarms and controllers, etc., and its main task is to control various instrument display information parameters and alarms.

The current of the welding machine is very small when it is not loaded, but the current is very large when it is working, and it is generally 40-60A, and when welding large parts, sometimes, the interval current can reach 100-200A. The output voltage is generally between 40-80V or higher, taking the voltage 50V current 100A as an example, if the power supply is calculated from the 220V voltage value, the grid current will be: 220 50 = 100 i, i = 50 * 100 220 =; If the power supply is taken from 380 voltage, the grid current will be generated: 380 50 = 100 i, i = 50 * 100 380 =.

Therefore, in order to reduce the impact of the electric welding machine on the power grid, most of the electric welding machines with large power use 380V (2 live wires), such a large current, and it is spaced, the power grid will definitely produce an interval voltage drop due to the relationship between the line and the power supply resistance, so the grid voltage is difficult to stabilize.

Most of the welding machines working in residential areas are 220V, and from the analysis above (1), it can be seen that the impact on the power grid is even greater.

Two reasons.

First, the voltage drops due to the increase of line loss. The greater the current in the line, the greater the loss of the line, that is, the greater the voltage drop on the line, the lower the voltage of the electrical appliance.

The second is the decline in power output. The larger the electrical appliance (the higher the current used by the appliance), the greater the voltage drop in the output of the power supply (transformer).

When the amount of electrical current changes, it causes the voltage to change.

It is mainly caused by the internal resistance of the line, one is the internal resistance of the power supply coil of the power supply transformer, the other is the internal resistance of the power supply line, the voltage drop at both ends of the power supply line UO = IR, the circuit current increases, and the voltage drop at both ends of the power supply line increases, so the voltage U1 that reaches the electrical appliance is equal to the total output voltage of the power supply transformer U minus the line voltage drop UO. The change of the current of the power supply line will directly cause the voltage change of the electrical end. Hope to adopt.

The total capacity of the transformer is certain, and the welding machine will produce a large current when working, which will cause the voltage to drop.

DC or AC? Are there semiconductor devices such as diodes in the circuit? Gotta describe it clearly.