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Distribution transformer low voltage side compensation capacity of by zyzy wang
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Distribution transformer low voltage side compensation capacity of by ZYZY WANG
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| Article Posted: 02/13/2011 |
| Article Views: 94 |
| Articles Written: 2301 - MORE ARTICLES FROM THIS AUTHOR |
| Word Count: 654 |
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Distribution transformer low voltage side compensation capacity of |
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Business,Business News,Business Opportunities
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In order to improve power factor, reduce power consumption, increase supply, the Rural Reconstruction, the distribution should 100kVA and above Transformer In the low voltage side of distribution transformer installed capacity of about 8% of the rated capacity of the compensation capacitor reactive power compensation. But many people believe that by 8% of the capacity of distribution transformer capacity allocation of compensation is too small to compensate all low-voltage side of the reactive load power factor of distribution transformer high side not so much. In fact, this is a misunderstanding, because the low voltage side of distribution transformer reactive power compensation, the role is limited to the transformer itself and over the distribution network power loss, all delivered to the load reactive power, due to low voltage lines still have to go through the resistance and reactance and distribution line power loss has not diminished. Therefore, the distribution transformer low voltage side of excessive compensation capacity choice is not helpful. Only to low-voltage side of distribution transformer compensation and compensation for the client in situ combination of compensation can improve the power factor at the same time, reduce the loss of low-voltage lines, to achieve best value for money.
Content distribution transformer low voltage side of the excessive compensation is not only economic, but also in the transformer no-load run-time, or the load is light, will result in over compensation to advance the power factor angle, reactive power back to the power system to send and supply voltage increases.
Ahead of the bad power factor angle is:
(1) of the capacitor and the power is still reactive power exchange, the same active efforts to reduce power.
(2) transmission network for capacitive reactive power, will result in power loss.
(3) cost of the capacitor device in vain Investment .
In addition, as compensation capacitor is too large, when the power may be issued when Phase Pig iron Magnetic resonance over-voltage, capacitors and transformers destroyed.
Therefore, low-voltage side of distribution transformer capacity excessive compensation is not only uneconomical, but also affect the safe operation of equipment.
Based on the above analysis, focused on low voltage side of distribution transformer reactive power factor compensation according to the needs of select scientific, compensation capacity should not be too large. To prevent the phenomenon of excessive compensation, distribution transformer low voltage side of the principle of compensation: the compensation should not exceed the capacity of reactive power distribution transformer.
Total transformer reactive power: Qb = Qb0 + QbH? (S / Se) 2
Qb = [I0% / 100 + Ud% / 100? (S / Se) 2]? Se (1)
Type of Qb0-transformer no-load reactive power, kvar
QbH-transformer full load reactive power, kvar
I0% - the percentage of transformer no-load current
Ud% - the percentage of transformer short-circuit voltage
S-transformer actual load, kVA Se-transformer rated capacity, kVA Convenient for applications, the transformer load, the total rated capacity of reactive power and the ratio of the percentage referred to Qb, the full load:
Qb% = Qb / Se? 100% = I0% + Ud% (2)
According to national standard GB/T6451-1995 "three-phase oil-immersed power transformers and technical requirements," provision, for 10kV distribution transformer, no-load current I0% to 0.9% ~ 2.8%, Ud% 4% 4.5 %, so the total reactive power transformer transformer capacity of about 7.3%. Therefore, low-voltage side of distribution transformer capacity of reactive power compensation should be in accordance with the distribution capacity of the 8% allocation. And the total reactive power load with 70% of users should be reactive load compensation for the client on the spot, to maximize the power factor, power transmission and distribution network to reduce losses. I am a professional writer from China Chemicals Products, which contains a great deal of information about almond toe , turbo heater fan, welcome to visit!
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