110 kv substation parallel capacitor
group for mode design in this paper, from the cutting mode, investment and maintenance cost and so on compares of several existing capacitor after operation mode, put forward a kind of suitable for unattended substation of convenient and practical way of capacitor.
New 110 kv substation HongXu in 2005, due to the limited funding, and the initial load is not much, so there is no installation of reactive power compensation device.
For two years, HongXu substation load development soon, has 14 mw, reactive capacity has reached the highest 5200 kvar, 10 kv bus bar power factor is 0.
93 and 0.
The requirement of 95 is still a gap, only rely on the user side compensation can not meet the need of reactive power, so consider on 10 kv bus bar installation capacitors for reactive power compensation.
Compensation capacity and compensation mode, how to choose the capacitor to choose how much and how to realize the distance for the unattended condition.
This article carries on the comparison to several kinds of capacitor installation, look to whether can find a way to meet the requirements.
1 capacitor switching mode existing capacitor switching mode existing in summary there are two main types, namely load cutting way and way of no load.
Below these two separately introduces the characteristics of the way.
1 no load for main equipment: two groups of isolating switch, a set of circuit breaker, a set of reactor, a set of discharge voltage transformer, a group of lightning arrester, a capacitor protection device, a set of 4800 kvar capacitor (
Each capacitor with fuse protection)
A wiring diagram is shown in figure 1.
Figure 1 no load for the wiring diagram for: can run by the personnel in the substation with insulation operating rod close each capacitor protection fuse is used to accurately cut, or by scheduling personnel in the dispatch center distance close circuit breaker to cut capacitor Banks.
The way to invest about 300000 yuan.
The advantages of no load cutting way is in the transformer substation for each cutting capacity is small, can accurate compensation.
Defect is unattended substation cutting must be to the scene, operating more (
To operation) for every
If remote operations, a total investment or total removal, compensation capacity of volatile, sometimes too, sometimes less.
2 load for main equipment: two groups of isolating switch, three sets of circuit breaker, two groups of reactor, two groups of plasma TV, a group of lightning arrester, a capacitor protection device, two sets of capacitor unit operation, a group of 3600 kvar capacitor, a group of 1200 kvar capacitor.
A wiring diagram is shown in figure 2.
Figure 2 has a load for the wiring diagram for: can be run in the substation or by scheduling personnel in the dispatch center distance close circuit breaker DL2 DL3, to cut the capacitor Banks.
The way to invest about 420000 yuan.
Has the advantages of load cutting way is to be able to in the distance for capacitor group, in a timely manner to compensate the reactive power capacity, because the capacitor can be divided into two groups, can according to the needs of the group for reactive power capacity, can accurately compensate reactive power capacity.
Defect is due to the frequent close switch DL2 DL3, its operating frequency is more, need to change after maturity, operation maintenance cost is higher.
Comparing more than two types of capacitor can be seen that the first way less investment, if the substation for less than words, or the distance can not endure compensation, or undercompensation.
Second way can in the distance in time for the required reactive power capacity, suitable for the need of unmanned substations, but investment is larger, and the maintenance cost is higher.
How to meet the capacity of reactive power cutting in time, the requirements of the investment and maintenance cost less?
Zaozhuang power supply company the following scheme is designed.
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