Capacitor compensation is indispensable in low-voltage cabinets, so what is the effect of capacitor compensation. The meaning of this is that it acts as a capacitor. Let's take a look at the principle of capacitor compensation first, when the capacitor is compensated, the capacitor and the load are connected in parallel, and the capacitor is like a bin. When the load increases, the power supply has internal resistance, so the power supply output voltage.
1. Compensation principle of power capacitor in low-voltage cabinet
In principle, a capacitor is equivalent to a generator that generates a soluble inactive current. The principle of reactive power compensation is to connect a device with a capacitive power load and a perceived power load to the same capacitor in parallel, and the energy is converted between the two loads. This reduces the load on the transformers and transmission lines of the grid and increases the output of active capacity. In the case of the output of a certain force, the loss of the power supply system is reduced. In contrast, capacitors are a simpler and more economical way to reduce the load on transformers, power supply systems, and industrial power distribution. Therefore, capacitors are indispensable as reactive power compensation for power systems. Nowadays, the use of shunt capacitors as reactive power compensation devices is now very common.
2. Compensation characteristics of power capacitors in low-voltage cabinets
forte
The power capacitor invalid compensation equipment is convenient, and the equipment site is convenient to increase or decrease. Oiler losses are small (only about 0.4% of the additional capacity). The construction period is short. Low investment, no rotating parts, simple operation and protection. A single capacitor bank is damaged, and does not affect the operation of the entire capacitor bank, etc.
flaw
The defect of the reactive power compensation equipment of power capacitors is that it can only adjust the level, and cannot be adjusted smoothly. The ventilation is not good, and the capacitor swells slightly when the operating temperature exceeds 70. Poor voltage characteristics, poor short-circuit stability, and residual charge after excision. The accuracy of reactive power compensation is low, which slightly affects the compensation effect. It is difficult to manage the operation of compensation capacitors, and the safe operation of capacitors is not taken seriously.
3. Reactive power compensation
High Voltage Dispersion Compensation
High-voltage dispersion compensation is actually a reactive power compensation capacitor that is designed to improve the voltage quality of the supply on the high voltage side of a single transformer. It is mainly used for urban high-voltage power distribution.
High voltage convergence compensation
High-voltage convergence compensation is a compensation method for capacitor equipment on the 6KV-10KV high-voltage bus of the substation or user step-down substation. The capacitor can also be equipped on the low-voltage bus of the user's main distribution room, which is suitable for the place where the load gathers, is close to the distribution bus, and the compensation capacity is large. Its advantages are: it can be conveniently implemented automatically put, reasonably improve the user's power elements, the utilization rate is high, the capital contribution is small, the protection is convenient, the regulation is convenient, the excessive supplement is prevented, and the voltage quality is improved, but the compensation economic benefits of this compensation mode are reduced.
Low-voltage dispersion compensation
Low-voltage cabinet distributed compensation is based on the reactive power demand of a single electrical equipment, a single or multiple low-voltage capacitor banks are dispersed near the electrical equipment, and the reactive power of all high-voltage circuits and transformers in front of the equipment part is compensated. Its advantage is that when the power equipment is running, the reactive power compensation input is carried out, and when the low-voltage cabinet equipment is out of power, the compensation equipment is also withdrawn, which reduces the reactive power flow of the distribution network and the transformer, and reduces the loss of oil Gongsun. Reducing the wire profile of the circuit and the capacity of the transformer with a small placeholder. The defects are low utilization rate, large investment, variable speed operation, forward operation, joging, blockage, and semi-folding brake motor is not suitable.
Low-voltage cabinet will be compensated
Low-voltage cabinet convergence compensation refers to the low-voltage capacitor connected to the low-voltage bus side of the distribution transformer through the low-voltage switch, and the reactive power compensation switchgear is used as the control and protection equipment to directly control the capacitor according to the reactive power of the low-voltage bus. The capacitor is cast by the whole group, and it is not possible to adjust it smoothly. The advantages of low-voltage cabinet compensation: simple wiring, less operation protection, reactive power balance, improved defecation utilization, reduced network loss, and high economy are one of the commonly used methods in reactive power compensation.
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