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Anti-harmonic capacitor

A technology of capacitors and harmonics, applied in the direction of structurally fixed capacitor combinations, etc., can solve the problems of high cost, inconvenient installation, and poor applicability of anti-harmonic components, and achieve the effect of small size, convenient installation, and strong applicability

Inactive Publication Date: 2009-12-02
季小龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the deficiencies of high cost, large volume, inconvenient installation and poor applicability of the existing anti-harmonic components of capacitors, the present invention provides an anti-harmonic capacitor with reduced cost, small size, convenient installation and strong applicability

Method used

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Embodiment 1

[0038] refer to figure 1 , figure 2 , Figure 5 ~ Figure 8 , an anti-harmonic capacitor, comprising a shell 7 and a three-phase capacitor 5 installed in the shell 7, the shell 7 is provided with a three-phase terminal 1 and a ground terminal 2, and each phase terminal is connected to the capacitor 5 respectively, so The anti-harmonic capacitor also includes a reactor 3 made of an amorphous alloy, the reactor 3 is located in the housing 1, and each phase terminal is connected to one end of the reactor 3, and the reactor The other end of 3 is connected to the capacitor 5 .

[0039] The reactor 3 is a ring-shaped inductor core. The capacitors 5 are connected in a delta shape. Filler 4 is filled in the casing, connecting wires 6 are used to connect between the terminal and the reactor, between the reactor and the capacitor, and between the capacitors.

[0040] Calculation of various parameters of the reactor in the anti-harmonic capacitor, calculation of three-phase compens...

Embodiment 2

[0060] refer to Figure 3-Figure 8 , The capacitors of the present invention are connected in a star shape, and N-phase terminals 8 are arranged on the outer casing, and the N-phase terminals 8 are respectively connected to each capacitor.

[0061] 0.25kv / 10kvar phase-separated compensation power capacitor calculation:

[0062] Rated voltage: 0.25KV

[0063] Rated capacity: 10Kvar

[0064] Rated frequency: 50Hz

[0065] Calculation of capacitance:

[0066] Q=UI*3;

[0067] I=0.314×C×U / 3

[0068] C=Q / 3×0.314×U×U

[0069] In the above formula, Q is the compensation capacitance in Kvar, U is the operating voltage in KV, I is the compensation current in A, and C is the capacitance value in uF. In the formula, 0.314=2∏f / 1000. According to the above formula, it can be calculated:

[0070] Ic=13.3A

[0071] C=169uF

[0072] The reactance value is calculated according to 6% of the capacitor capacity:

[0073] Qc=3UI

[0074] Ql=Qc×6% / 3

[0075] Ql=I×I×2∏fl / 3

[0076] l=Q...

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Abstract

The invention relates to an anti-harmonic capacitor, which comprises a shell and a three-phase capacitor arranged in the shell, wherein the shell is provided with three phases of connecting terminals and an earth terminal, and each phase of the connecting terminal is connected with the capacitor respectively. The anti-harmonic capacitor also comprises an electric reactor made from an amorphous alloy, the electric reactor is positioned in the shell, and each phase of the connecting terminal is connected with one end of the electric reactor, while the other end of the electric reactor is connected with the capacitor. The anti-harmonic capacitor has the advantages of cost reduction, small volume, convenient mounting and strong applicability.

Description

technical field [0001] The present invention relates to a capacitor. Background technique [0002] In the power supply and distribution system, in order to reduce losses, save electric energy, make full use of the capacity of transformers and other equipment, and improve the power factor of the power grid, a large number of shunt capacitor devices are configured to compensate for reactive power. In the previous power supply and distribution design, more consideration was given to how to compensate reactive power and improve the power factor value, while less consideration was given to the impact of harmonics. [0003] In recent years, the gradual increase of nonlinear loads in power grids is a common trend all over the world, such as variable frequency drives or thyristor rectifier DC drive equipment, computers, uninterruptible power supplies (UPS) for important loads, energy-saving fluorescent lamp systems, etc. These nonlinear loads It will cause 3rd, 5th, and 7th harmoni...

Claims

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Application Information

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IPC IPC(8): H01G4/40
Inventor 陈胜勇季小龙刘东
Owner 季小龙
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