The voltage at the end of the one phase line of the 220V distribution line is higher than that at th

In long-distance no-load lines, when the line to the ground capacitance is greater than the line inductive reactance, the voltage at the end of the line will rise, which is called the capacitance effect. Also called Rongsheng. Reason:

Let the voltage at the beginning of the line be U1, the terminal voltage should be U2, and the resistance to the ground should be XC, the inductive reaction XL, and the resistance R. For high-voltage lines, r is negligible compared to capacitive reactance and inductive reactance, then u1 = u2 + ux-uc, it is clear that ux is in the opposite direction to uc and uc > ux, so u1 will make the line voltage higher than the supply voltage. The more severe it is, the longer the line, the greater the capacitive effect, and the greater the increase in power frequency voltage.

It has to do with the zero sequence voltage.

The three-phase load of the transformer is unbalanced, resulting in the current vector sum of the three-phase live wire not being zero, and the excess current going from the zero line. The zero sequence current flowing through the zero line creates a voltage drop. It will make the phase voltage at the user's meter shift, some increase, some decrease.

Generally, the phase voltage of the heavy load decreases, and the phase voltage of the light load increases.

This is caused by the imbalance of the three-phase load, and the problem of evenly distributing the three-phase load can be solved.

v The allowable deviation value of the voltage of the power user is -10% +7% of the rated voltage of the system (198).

All of the above values are within the normal range.

Kilovolts, 220V is a phase. Generally, the end is higher than the first end due to capacitance or load imbalance, neutral point displacement.

The voltage of the low-voltage distribution line is 220V 380V. The rated voltage of the low-voltage line adopts the standard voltage specified by the respective country. The three-phase four-wire system of AC 220 380V is the most widely used in low-voltage lines in China, and there are other wiring methods such as AC single-phase two-wire system and three-phase three-wire system.

Definition of low-voltage line: Low-voltage line refers to power line with rated voltage of 1kV and below. Voltage lines include low-voltage overhead lines, low-voltage overhead insulated lines, low-voltage low-voltage cable lines and indoor distribution lines, which are used to directly transmit electric energy to low-voltage electrical equipment and are an important part of the low-voltage distribution system (see low-voltage power distribution). Types of low-voltage lines can be divided into four types:

Low-voltage overhead lines, low-voltage overhead insulated lines, low-voltage cable lines and indoor distribution lines. Low-voltage overhead lines, low-voltage overhead insulated lines, and low-voltage cable lines are generally used outdoors to directly supply power to outdoor electrical equipment and indoor low-voltage power distribution systems. Indoor power distribution lines include fixed lines connected to various electrical equipment in industrial and civil buildings.

b, no.

As far as distribution lines are concerned, the general voltage at 35 110kV is called high-voltage distribution lines; The voltage at 1 20kV is called medium voltage distribution line; The voltage below LKV is called low-voltage distribution line.

Summary. The three-phase line is only connected to the three-phase line with a concentrated load at the end of the ** line, the line current is I, the line resistance R, the reactance is X, the voltage at the beginning and end of the line is U1 and U2 respectively, and the power factor of the load is COS. Voltage drop ù=1- ù2=iz voltage loss is the algebraic difference between the voltages of u1 and u2 u= u1- u2 due to reactance x, the above is mine.

There is a transmission line with a rated voltage of 220kV, and the end of the line is connected with a load + S b = 40 + 330MVA + known line + the end of the road.

Can you add, I don't quite understand it.

The three-phase line is only connected to the three-phase line with a concentrated load at the end of the ** road, the line current is I, the line resistance R, the reactance is X, the line grip orange start and the end voltage are U1, U2 respectively, and the power factor of the load is COS. Voltage drop ù=1- ù2=iz voltage loss is the algebraic difference between the phasor voltages of u1 and u2 u= u1- u2 due to reactance x, and the above is mine.

Answer]: The C voltage drop is the vector difference of the voltage of the electric bending cavity at the end of the line. Voltage loss is the difference in amplitude between the first and last voltages of a line. Voltage embedded macro offset refers to the difference between the actual voltage at a certain point in the ** road and the rated voltage at that place, which is expressed as a percentage circle.