CN207053174U - Harmonic protection device - Google Patents

Abstract

It the utility model is related to a kind of harmonic protection device; with five binding posts of A, B, C, N and PE; suitable for three-phase five-wire mode system; PCB circuits built in shell; five binding posts of the PCB circuits and A, B, C, N and PE are connected; on the PCB circuits, A, B and C three-phase filter out harmonic wave caused by load-side by CBB electric capacity respectively.Harmonic protection device of the present utility model is not changed by power network and load parameter and fluctuation is influenceed, and can all subharmonic be filtered out with effect, and will not overload, and cost is lower, cost-effective, while harmonic protection device is compact, easy for installation.

Description

Harmonic protection device

Technical field

It the utility model is related to harmonic filter, more particularly to a kind of harmonic protection device.

Background technology

As power load quickly increases and the extensive application of power electronic equipment, nonlinear-load have become power train The important component of system.Nonlinear-load is the major reason for producing harmonic wave.Processing for harmonic wave, the overwhelming majority are all adopted Use wave filter.The species of wave filter is essentially divided into two kinds, active filter and passive filter.Active filter is a kind of electricity Power electronic installation.The harmonic wave that this wave filter can all change to frequency and amplitude is tracked compensation, and compensation characteristic is not by electricity The influence of net impedance, both can to a harmonic wave and reactive source separate compensation, also can to multiple harmonic waves and reactive source centralized compensation, But cost is very high.And traditional passive filter, performance parameter are difficult to change, shadow of the filtering characteristic by systematic parameter Sound is larger.When systematic parameter changes, passive filter is possible to failure or even can cause resonance.Therefore when Network Harmonic Impedances drop When low, filter effect will decrease；When electrical network parameter is constant and during harmonic current increase, passive filter may be overloaded. Even if on the other hand electrical network parameter harmonic electric current is all constant, but due to temperature change, passive filter components aging and other Factor can all influence performance of filter and reduce efficiency.The reactive capacitance value of this passive filter generally also has tolerance and deviateed Its standard value ± 10% and add off resonance degree, can also reduce filtration efficiency；Specific several subharmonic can only be eliminated, and to some Subharmonic can produce amplification.When grid short circuit capacity big (i.e. source impedance is small), then passive filter impedance is required also Smaller, that is, it is precision tuning (sharp tuning) to require wave filter, but tolerance due to component capabilities and variation make setting for wave filter In respect of very big difficulty；When harmonic current increases, passive filter burden aggravates therewith, wave filter may be caused to overload；Effectively High material consumption, volume are big.

Utility model content

The utility model is in order to meet the needs of prior art, there is provided a kind of filter effect is run close to active power filtering It is stable, do not influenceed by electrical network parameter, relatively cost-effective a harmonic protection device.

The utility model provides a kind of harmonic protection device, including shell, binding post, PCB, base, fixed screw Hole, binding post are fixed on shell, and PCB is fixed in shell, and the base is fixed on shell by fixed screw holes On, binding post A, B, C, N, PE are provided with the PCB and is connected respectively with A, B, C, N, PE of binding post, it is described to connect Line terminals A, B, C, PE are connected by first, second, third and fourth piezo-resistance with binding post N respectively, first, second He 3rd electric capacity is connected between binding post A and N, B and N, C and N respectively, for filtering out the humorous of the A phases of load-side, B phases and C phases Ripple electric current, first, second, and third electric capacity are CBB electric capacity.

In the preferred embodiment of the utility model one, in the PCB also include first resistor, the first diode and First light emitting diode, connection and the terminals after the first resistor, the first diode and the series connection of the first light emitting diode Between sub- A and binding post N.

In the preferred embodiment of the utility model one, in the PCB also include second resistance, the second diode and Second light emitting diode, connection and the terminals after the second resistance, the second diode and the series connection of the second light emitting diode Between sub- B and binding post N.

In the preferred embodiment of the utility model one, in the PCB also include 3rd resistor, the 3rd diode and 3rd light emitting diode, connection and the terminals after the 3rd resistor, the 3rd diode and the series connection of the 3rd light emitting diode Between sub- C and binding post N.

In the preferred embodiment of the utility model one, the PCB upper connecting terminal N passes through ceramic condenser and the 4th The series circuit of resistance is connected with binding post PE.

It is as follows the advantages of harmonic protection device of the present utility model compared to prior art：

Harmonic protection device of the present utility model is not changed by power network and load parameter and fluctuation is influenceed, can be to all times Harmonic wave filters out effect, and will not overload, and cost is lower, cost-effective, while harmonic protection device is compact, easy for installation.

Brief description of the drawings

Fig. 1 is the structure chart of harmonic protection device of the present utility model.

Fig. 2 is PCB schematic diagram built in harmonic protection device of the present utility model.

Fig. 3 is the application exemplary plot of harmonic protection device of the present utility model.

Each element title and its label：

Harmonic protection device 1, shell 11, binding post A/B/C/N/PE, PCB 12, base 13, base fixed screw holes 131, piezo-resistance R5, piezo-resistance R6, piezo-resistance R7, piezo-resistance R8, electric capacity C1, electric capacity C2, electric capacity C3, resistance R1, Resistance R2, resistance R3, resistance R4, diode D1, diode D2, diode D3, light emitting diode D4, light emitting diode D5, hair Optical diode D6, PCB position fixing hole 121.

Embodiment

The technical scheme in the utility model embodiment will be clearly and completely described below, it is clear that described Embodiment be only a part of embodiment of the utility model, rather than whole embodiment.Based on the utility model In embodiment, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made Mode, belong to the scope of the utility model protection.

As shown in figure 1, be the structure chart of the utility model harmonic protection device 1, including shell 11, binding post A/B/C/N/ PE, PCB 12, base 13, base fixed screw holes 131, the binding post A/B/C/N/PE are fixed on shell 11, and It is connected with PCB 12, the PCB 12 is fixed on shell 11, and base 13 is solid by base fixed screw holes 131 It is scheduled on shell 11.

As shown in Fig. 2 being the schematic diagram of PCB 12 of the present utility model, the PCB 12 is provided with wiring Terminal A/B/C/N/PE, the binding post A/B/C/N/PE are connected with the binding post A/B/C/N/PE respectively, the wiring Terminal A, B, C, PE are connected by piezo-resistance R5, R6, R7 and R8 with binding post N respectively, avoid switching or induction of being struck by lightning is produced Raw surging influences, and ensures the stable operation of wiring board, protects Sensitive Apparatus.Electric capacity C1, C2 and C3 are connected on terminals respectively Between sub- A and N, B and N, C and N, for filtering out the A phase B phases of load-side and the harmonic current of C phases.Described electric capacity C1, C2 and C3 For CBB electric capacity.

Binding post A is connected by resistance R1, diode D1 and light emitting diode D4 with binding post N, wherein resistance R1, Diode D1 and light emitting diode D4 series connection；Binding post B passes through resistance R2, diode D2 and light emitting diode D5 and terminals Sub- N connections, wherein resistance R2, diode D2 and light emitting diode D5 series connection；Binding post C by resistance R3, diode D3 and Light emitting diode D6 is connected with binding post N, wherein resistance R3, diode D3 and light emitting diode D6 series connection.Resistance R1, R2 and R3 is current-limiting resistance, prevents voltage is excessive from burning light emitting diode D4, D5 and D6.Diode D1, D2 and D3 are to prevent anti-phase electricity Pressure breakdown light emitting diode D4, D5 and D6.Light emitting diode D4, D5 and D6 can clearly distinguish the work shape of harmonic protection device State, instruction harmonic protection device whether phase shortage.

Binding post N connects by ceramic condenser C4 with resistance R4 series circuit in binding post PE, ensure that circuit The stable operation of plate, while also from the influence for the surging produced by inducing that switchs or be struck by lightning.

It is and described as shown in figure 3, harmonic protection device 1 provided by the utility model is connected between grid side and load-side Load-side is in parallel, when load-side is run, produces substantial amounts of harmonic current and is sent on power network, and enters in harmonic protection device, Grid side is no longer directly entered, so as to have the function that harmonic filtration.A, B, C, N, PE points of the binding post of the harmonic protection device 1 It is not connected with load-side power electric cable A phase, B phase, C phase, N lines, PE lines.

The effective of harmonic wave generating device of the present utility model be：

Harmonic protection device 1 of the present utility model is not changed by power network and load parameter and fluctuation is influenceed, can be to all Subharmonic filters out effect, and will not overload, and cost is lower, cost-effective, while harmonic protection device is compact, installation side Just.

The explanation of above example is only intended to help and understands method and its core concept of the present utility model.It should refer to Go out, for those skilled in the art, can also be to this on the premise of the utility model principle is not departed from Utility model carries out some improvement and modification, and these are improved and modification also falls into the protection domain of the utility model claims It is interior.

The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or new using this practicality Type.A variety of modifications to these embodiments will be apparent for those skilled in the art, determine herein The General Principle of justice can be realized in other embodiments in the case where not departing from spirit or scope of the present utility model.Cause This, the utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein The most wide scope consistent with features of novelty.

Claims (5)

1. harmonic protection device, it is characterised in that including shell, binding post, PCB, base, fixed screw holes, binding post It is fixed on shell, PCB is fixed in shell, and the base is fixed on shell by fixed screw holes, the PCB Binding post A, B, C, N, PE is provided with wiring board to be connected with A, B, C, N, PE of binding post respectively, the binding post A, B, C, PE is connected by first, second, third and fourth piezo-resistance with binding post N respectively, first, second, and third electric capacity point It is not connected between binding post A and N, B and N, C and N, for filtering out the A phases of load-side, B phases and the harmonic current of C phases, institute It is CBB electric capacity to state first, second, and third electric capacity.

2. harmonic protection device as claimed in claim 1, it is characterised in that also include first resistor, first in the PCB Diode and the first light emitting diode, connection and institute after the first resistor, the first diode and the series connection of the first light emitting diode State between binding post A and binding post N.

3. harmonic protection device as claimed in claim 2, it is characterised in that also include second resistance, second in the PCB Diode and the second light emitting diode, connection and institute after the second resistance, the second diode and the series connection of the second light emitting diode State between binding post B and binding post N.

4. harmonic protection device as claimed in claim 3, it is characterised in that also include 3rd resistor, the 3rd in the PCB Diode and the 3rd light emitting diode, connection and institute after the 3rd resistor, the 3rd diode and the series connection of the 3rd light emitting diode State between binding post C and binding post N.

5. harmonic protection device as claimed in claim 1, it is characterised in that the PCB upper connecting terminal N passes through ceramic electrical Hold and the series circuit of the 4th resistance is connected with binding post PE.