Which prawn knows the calculation method of transformer no load reactive power loss

Hehe. Tell you a quick calculation method and formula for electricians:

Distribution power transformer, no-load reactive power loss value.

The no-load current is multiplied by the capacity divided by hundred.

The formula is, q0=i0sn 100

where q0 is the no-load reactive power of the power transformer, which is lacking; i0 is the no-load current standard value of the power transformer; SN is the rated capacity of the power transformer, kVA.

Description: (1) For the loss of power transformer in operation, people often only pay attention to the active loss of copper loss and iron loss, and it is easy to ignore the loss caused by the reactive power of the transformer. In fact, the reactive power loss of transformer has a non-negligible impact on the power system.

When transmitting reactive power in the system, active energy is consumed, and the reactive economic equivalent k is the active loss value increased in the system for every 1,000 reactive power consumed at the place where the reactive power is used, and the unit is kilowatt 1,000 yuan.

2) The reactive power Q of the power transformer is composed of the excitation power Q0 of the core and the reactive power Q1 of the coil, that is, Q=Q0+Q1. When the primary voltage is unchanged, Q0 is actually the reactive power of the transformer during the no-load test, that is, Q0=I0SN 100. It can be seen that Q0 is the same as the iron loss of the transformer, when the voltage is unchanged, it is only related to the weight and quality of the transformer's core.

Therefore, for a formed power transformer, Q0 is basically a constant quantity.

3) It is known by the electrical principle: the capacitor current is in the opposite direction to the inductor current, and its phase is ahead of the voltage by 90°. Using this principle, the excitation current (i.e., inductor current) of the transformer can be offset with capacitive current, so that the total reactive current of the grid can be reduced.

Specifically, the high-voltage side of the distribution transformer is incorporated into the capacitor of the appropriate capacity in situ. After compensation, this part of the reactive power is not delivered by the grid as before compensation, but is supplied by local compensation capacitors. This can improve the transmission capacity of the grid, reduce line and transformer losses, and reduce the burden on the power supply.

The required capacitor installation compensation capacity QC=Q0=I0SN 100.

The algorithm is as follows: no-load loss = no-load loss process coefficient unit loss core weight.

Load loss: When the secondary winding of the transformer is short-circuited (steady state), the rated current of the primary winding is flowed.

The active power consumed is called load loss. The algorithm is as follows:

Load loss = resistance loss of the largest pair of windings + additional loss.

Additional loss = eddy current loss of winding + circulation loss of parallel winding wire + stray loss + lead loss.

Impedance voltage: When the secondary winding of the transformer is short-circuited (steady-state), the voltage applied by the rated current of the primary winding is called the impedance voltage uz, which is usually uz to the rated voltage.

, i.e., uz=(uz u1n)*100%.

Summary. Hello dear, the 2500kva transformer loss is 1360w The calculation method is as follows: no-load loss nl=PO+KQO=PO+K (IO*2500 100)=1360W load loss ll=PF+KQF=PF+K (ud*2500 100)=1200W

Hello dear, the loss of 2500kva transformer is 1360w, and the calculation method is as follows: no-load loss nl=po+kqo=po+k (io*2500 100)=1360w, load rock disturbance loss ll=pf+kqf=pf+k (ud*2500 100)=1200w

Extended information: 2500kva transformer no-load loss 1360W, no-load noisy hall finch circle current, impedance voltage, load loss 12000W. There are some differences in the losses of different types of transformers.

For example, the S11-2500 transformer, the no-load loss is, and the load loss rises and falls.

Summary. In general, the no-load loss of the transformer (called iron loss) is about one thousandth of the transformer capacity; The rated loss of the transformer, known as the copper loss, is about one percent of the transformer's capacity. S11 2000KVA transformer enterprise standard:

The no-load loss is 1960W and the load loss is 17820W

In general, the no-load loss of the transformer (called iron loss) is about one thousandth of the transformer capacity; The rated loss of the transformer, known as the copper loss, is about one percent of the transformer's capacity. S11 2000KVA early hood transformer enterprise standard: no-load loss 1960W negative open withstand load loss 17820W

What is Iron Loss? What is copper loss? Is it 1 day, or 1 hour?

Inside the transformer there is something called winding resistance, which is a residual liquid composed of an iron core and copper wire. After the transformer is powered off, even if there is no electrical load access, the iron core itself is a conductor, which will also generate current to heat the transformer and produce rubber loss Liang Hui, which is the no-load loss, also known as "iron loss".

What is the no-load loss of a dry-type transformer with a capacity of 1600kva? How to calculate it?

1. At present, the national standard for the loss of F-class insulation (epoxy resin dry change), 1600KVA, 10KV 400V SCR dry-type transformer is: no-load loss: 2700W, load loss:

13500w (120 degrees). 2. If the transformer operates under rated conditions (under rated load), the total loss of the transformer is 2700 + 13500 = 16200w,..

The algorithm is as follows: no-load loss = no-load loss process coefficient unit loss core weight.

Load loss: When the secondary winding of the transformer is short-circuited (steady-state), the active power consumed when the rated current is flowed through the primary winding is called load loss. The algorithm is as follows:

Load loss detection loss = resistance loss of the largest pair of windings + additional loss.

Additional loss = eddy current loss of winding + circulation loss of parallel winding wire + stray loss + lead loss.

Impedance voltage: When the secondary winding of the transformer is short-circuited (steady-state), the voltage applied by the rated current of the primary winding is called the impedance voltage uz, which is usually expressed as a percentage of the rated voltage, that is, uz=(uz u1n)*100%.