A harmonic protection cabinet for power distribution system

Abstract

The invention discloses a harmonic protection cabinet of a power distribution system. A wire inlet end is provided with an overvoltage protector and an overcurrent protector, wherein the overvoltage protector and the overcurrent protector are coupled to an active filter; the active filter is coupled to a controller; a variable capacitor is coupled to the controller; an SVG compensator, an electronic voltage transformer, an electronic current transformer, an anti-harmonic controller, a temperature adjusting protector and a remote warning device are coupled to the controller separately; and a PWM adjuster is coupled to the controller for driving a semiconductor drive protector. By the harmonic protection cabinet of the power distribution system, a harmonic wave can be effectively filtered, multi-aspect detection is carried out by combining reactive power compensation, the dynamic change of a load in a power grid is timely tracked; and the harmonic wave in the power grid is effectively managed.

Description

technical field

[0001] The invention belongs to the technical field of distribution network protection, in particular to a harmonic protection cabinet for a power distribution system. Background technique

[0002] With the continuous development of computer technology, communication technology and control technology, intelligent buildings are constantly changing with each passing day. At the same time, a large number of modern electrical equipment and devices are used in intelligent buildings, resulting in a harsh harmonic environment. Safe normal operation poses a great threat.

[0003] Harmonics are actually a kind of interference. Injection into the public grid will cause the grid to be "polluted". Higher harmonics will also directly cause damage to electrical equipment, causing overheating of cables and wires, phase-to-phase short circuits and ground faults, and zero-crossing noise. Wasted system capacity, increased power supply system loss, accelerated insulation aging...

Examples

Embodiment

[0016] Embodiment: A harmonic protection cabinet for a power distribution system. The method provided by the present invention will be described in detail in conjunction with the accompanying drawings.

[0017] A harmonic protection cabinet for a power distribution system, characterized in that: an overvoltage protector 2 and an overcurrent protector 3 are installed at the incoming line end, which are used to control electric equipment caused by excessive voltage and current caused by fluctuations in the power grid; The overvoltage protector 2 and the overcurrent protector 3 are coupled to the active filter 5; the active filter 5 is coupled to the controller 1; the variable capacitor 6 is coupled to the controller 1 And connected in parallel with the active filter 5, used to adjust the parameters of the active filter 5; SVG compensator 4, coupled to the controller 1 for reactive power compensation of the line; electronic voltage transformer 7, The electronic current transforme...

technical field

[0001] The invention belongs to the technical field of distribution network protection, in particular to a harmonic protection cabinet for a power distribution system. Background technique

[0002] With the continuous development of computer technology, communication technology and control technology, intelligent buildings are constantly changing with each passing day. At the same time, a large number of modern electrical equipment and devices are used in intelligent buildings, resulting in a harsh harmonic environment. Safe normal operation poses a great threat.

[0003] Harmonics are actually a kind of interference. Injection into the public grid will cause the grid to be "polluted". Higher harmonics will also directly cause damage to electrical equipment, causing overheating of cables and wires, phase-to-phase short circuits and ground faults, and zero-crossing noise. Wasted system capacity, increased power supply system loss, accelerated insulation aging...

Examples

Embodiment

[0016] Embodiment: A harmonic protection cabinet for a power distribution system. The method provided by the present invention will be described in detail in conjunction with the accompanying drawings.

[0017] A harmonic protection cabinet for a power distribution system, characterized in that: an overvoltage protector 2 and an overcurrent protector 3 are installed at the incoming line end, which are used to control electric equipment caused by excessive voltage and current caused by fluctuations in the power grid; The overvoltage protector 2 and the overcurrent protector 3 are coupled to the active filter 5; the active filter 5 is coupled to the controller 1; the variable capacitor 6 is coupled to the controller 1 And connected in parallel with the active filter 5, used to adjust the parameters of the active filter 5; SVG compensator 4, coupled to the controller 1 for reactive power compensation of the line; electronic voltage transformer 7, The electronic current transforme...

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