Phase voltage or line voltage

Phase voltage or line voltage

Is the rated voltage in the power system a line voltage or a phase voltage?

Only 220 volts is the phase voltage, and others are the line voltage.

The voltage between the terminal line and the neutral line is called the phase voltage.

The voltage between two ends is called a line voltage.

In the power transmission system, there is no Neutral Line on the high voltage line, and only three-phase ABC is sent. Therefore, only the line voltage does not have the phase voltage,

In a three-phase four-line AC system, the voltage between any two phase lines is called the line voltage. The voltage between any phase line and the Neutral Line (zero line) is called the phase voltage.

For example, in our most common three-phase 380 V system, the voltage between any two wires is 380 V, which is a line voltage. The voltage between any wire and zero wire is 220 volts, and 220 volts is the phase voltage ,. The line voltage is 1.732 times the phase voltage. 220*1.732 = 380 ..

 

 

Whether the 110kv voltage in the 110kv power system is phase voltage or line voltage

High-voltage power transmission and transformation adopts three-phase neutral line operation, and the device connection method is triangle.

Therefore, the system voltage refers to the line voltage.

The voltage between AB, BC, and Ca is 110kv.

 

Ask for leave about the 10 110 220 in a substation with a voltage grade of 10 kV respectively refer to the phase voltage return line voltage?

In the power system, the voltage of the normal three-phase four-wire connection refers to the line voltage.

The 10 kV bus of the 110kv substation is a single-bus multi-segment operation mode. When one of the outlets is overloaded, the voltage of one phase decreases, and the voltage of the other two phases increases, the two masters are changed and run, the fault is eliminated. Why?

In star connections with asymmetric loads (non-Grounded Neutral points or grounded by a small impedance), the neutral point is prone to offset. It is normal for one phase to decrease and the other two phases to increase, however, after the two main transformers are tied together, the internal impedance of the power supply itself is greatly reduced, and the load carrying capacity is greatly improved. In the case of asymmetric load, the neutral point offset will be relatively small, so it returns to normal.

Can I use a high-voltage wireless Transcoder to display the same phase for the 10 kV substation and the 10 kV substation's outgoing core?

Yes, if it is just a single-core phase, but if it is necessary to make a vector, it needs to be done by the Power Bureau when there is load.

In fact, the high-voltage phase meter is a voltmeter, and there is no voltage between the same phase. If there is a voltage, it is a different phase.

I would like to know which of the 10 kV, 35kv, 110kv, and 220kv substations are equipped with line voltage transformer and bus voltage transformer. Their Respective functions

My substation staff

The four voltage levels of the bus voltage transformer must be installed. In the field, we call the voltage transformer PT.

Line Voltage Transformer 10 kV will not be installed, other will.

Next we will talk about the role of Pt. The main role of PT is to change high voltage to low voltage (usually the secondary voltage u2n = 100 V) for metering, protection, and synchronization. Generally, a PT has multiple secondary windings, which are used in different places.

The main differences between the PT and the PT are as follows: the PT of the line is only mounted on the phase, with low precision and a small number of secondary winding. It is used for measurement and for simultaneous inspection. Test ABC three-phase bus PT, high precision, multiple secondary winding, used for various protection, measurement, measurement and so on.

Why is the phase voltage of the substation 10 kV bus not equal to the line voltage? The 10 kV side of the transformer is a triangular connection. The phase voltage of the triangular connection is equal to the line voltage.

The phase voltage of the 10 kV bus in the substation is not the phase voltage of the step-down transformer, but the relative voltage. That is, the neutral point voltage. Here, the neutral point is not the neutral point of the Y-mode winding, but the neutral point formed by the busbar and the local capacitance of the line.