CN205753409U - A kind of intermediate frequency furnace harmonic filter system of low cost - Google Patents
A kind of intermediate frequency furnace harmonic filter system of low cost Download PDFInfo
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- CN205753409U CN205753409U CN201620544851.7U CN201620544851U CN205753409U CN 205753409 U CN205753409 U CN 205753409U CN 201620544851 U CN201620544851 U CN 201620544851U CN 205753409 U CN205753409 U CN 205753409U
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- 238000002955 isolation Methods 0.000 claims abstract description 44
- 238000007493 shaping process Methods 0.000 claims abstract description 29
- 230000008878 coupling Effects 0.000 claims abstract description 16
- 238000010168 coupling process Methods 0.000 claims abstract description 16
- 238000005859 coupling reaction Methods 0.000 claims abstract description 16
- 238000001914 filtration Methods 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 210000001367 artery Anatomy 0.000 claims description 2
- 210000003462 vein Anatomy 0.000 claims description 2
- 230000003321 amplification Effects 0.000 abstract description 6
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- 238000009434 installation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- -1 short net Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
This utility model provides the intermediate frequency furnace harmonic filter system of a kind of low cost, including isolation shaping unit, Phototube Coupling unit, frequency detecting control unit, controls performance element and harmonics filter units；Harmonics filter units includes the filter branch of more than one corresponding different tuned frequency, frequency detecting control unit receives isolation shaping unit detection signal through Phototube Coupling unit, the input or the excision that are controlled each filter branch in harmonics filter units by switch control unit accordingly realize the dynamic filter to intermediate frequency furnace harmonic wave, the filter amplification even resonance to the uncharacteristic harmonics that intermediate frequency produces can be prevented effectively from, guarantee security of system, and this utility model simple in construction, cost is relatively low, realization is convenient, safe and reliable to operation.
Description
The application is Application No. 201521134262.3, and filing date December in 2015 30 days, invention and created name is
The divisional application of the utility application of " a kind of intermediate frequency furnace harmonic filter system ".
Technical field
This utility model relates to intermediate frequency furnace and controls technical field, is specifically related to a kind of intermediate frequency furnace harmonic filter system and work thereof
Make method.
Background technology
Intermediate frequency furnace (intermediate frequency furnace) is the main flow equipment that scrap iron reclaims melting again.It is mainly by transformator, intermediate frequency power supply
The compositions such as cabinet, compensation capacitor, short net, medium frequency induction melting furnace, hydraulic tilting device, water-cooling system, baking equipment.Its principle
It is to be the intermediate frequency power supply that direct current another mistake becomes more than 100Hz by 50Hz power supply through intermediate frequency power cabinet rectification, makes Medium frequency induction melting
In stove, steel scrap sensing is exothermic melting for molten steel.Rectification circuit produces the characteristic harmonics relevant to rectified pulsatory number, overtone order: special
Levying overtone order is: Hn=kp ± 1, and p represents the number of phases (pulse number), and k is positive integer；It is humorous that medium frequency inverter circuit produces non-feature
Ripple, uncharacteristic harmonics frequency is: Fhm=2*FLn ± F1, in formula: Fhm is the uncharacteristic harmonics frequency that alternating current source produces,
FLn is IF-FRE, and F1 is mains frequency.Characteristic harmonics Hn and intermediate frequency power supply that rectification produces produce uncharacteristic harmonics Hm and inject
Network system will produce the biggest harm to network system.Thus, when the distribution system of design and construction nonlinear-load,
Should take the measure of suppression and harmonic carcellation, " quality of power supply is public to make user's distribution system meet the national harmonic standard worked out
Mains by harmonics " GB/T14549-93 requirement, and make user's charging point monthly average power factor higher than 0.9.
Prior art is usually taken following measures suppression or harmonic carcellation impact: one is to increase electric power system to hold harmonic wave
By ability；The capacity of short circuit of raising system；Use higher voltage power supply；Two is to reduce harmonic wave generating capacity: increase fairing
Rushing and rapid pulse, increase commutation reactance, improvement trigger symmetry；Try one's best centrally connected power supply with type nonlinear-load, utilize harmonic source it
Between phase place difference cancel out each other fractional harmonic；Three is to install electric harmonic filter.Wherein, the capacity of short circuit of system is strengthened
It is difficult to；The equivalent phase number increasing commutator is also restrained, when equivalent phase number is more than 12 phase times, need to increase phase shifiting device,
Can bring the inconvenience that maintenance runs simultaneously, thus install harmonic filtering installation and just become first-selection, harmonic filtering installation can disappear
Except harmonic wave, again can compensating power, improve power factor, there is significant economic benefit.
When taking to install electric harmonic filter means, the most general setting by commutating circuit characteristic harmonics filters back
Road, and carry out switching filter by physical quantitys such as intermediate frequency furnace power factor or idle generating capacities.Due to the life different at intermediate frequency furnace
It is change that product stage medium frequency inverter circuit produces uncharacteristic harmonics, and the filter circuit tuned frequency put into is as higher than this non-spy
When levying harmonic frequency, this uncharacteristic harmonics will be amplified by filter circuit, produce system resonance, harm equipment and electrical network system time serious
System safety；For avoiding Harmonics amplification and system resonance, it is humorous that filter circuit resonant frequency is positioned below non-feature by portion of techniques
Wave frequency, though Harmonics amplification and system resonance can be avoided, but sacrifices the filtering performance to harmonic wave.
Utility model content
The purpose of this utility model is: the intermediate frequency power supply frequency passing through to monitor in real time intermediate frequency furnace when providing a kind of use is corresponding
Dynamically adjust the input of harmonic branch road and excise to realize the Filtering Processing to intermediate frequency furnace harmonic wave, it is possible to being prevented effectively from filtering
Device to the amplification even resonance of the uncharacteristic harmonics that intermediate frequency power supply produces so that it is guaranteed that the intermediate frequency of the low cost of security of system
Stove harmonic filter system.
The technical solution of the utility model is: the intermediate frequency furnace harmonic filter system of low cost of the present utility model, including for
The intermediate frequency power supply that mid-frequency melting furnace is powered, it is structurally characterized in that: also include:
Isolation shaping unit is equal with the real-time frequency of intermediate frequency power supply for being transformed to by intermediate frequency power supply ac voltage signal
Pulse signal；The input of isolation shaping unit electrically connects with the outfan of intermediate frequency power supply；
Frequency detecting control unit, is used for detecting intermediate frequency power supply ongoing frequency signal and sending harmonic switching control accordingly
System order；
Light-coupled isolation unit, couples biography for being isolated with frequency detecting control unit and realize signal by isolation shaping unit
Defeated；The input of light-coupled isolation unit electrically connects with the outfan of isolation shaping unit；The signal of frequency detecting control unit is defeated
Enter end to electrically connect with the output end signal of light-coupled isolation unit；The power end of light-coupled isolation unit and frequency detecting control unit
Power output end electrically connects；
Harmonics filter units, for the harmonic to intermediate frequency power supply；It includes that N number of tuned frequency is different and medium frequency electric
The filter branch that source is in parallel, wherein N is the natural number more than 1；
Control performance element, control harmonics filter units is filtered accordingly for the order according to frequency detecting control unit
The input of ripple branch road and excision；Control the control signal input of performance element and the signal output part of frequency detecting control unit
Electrical connection；Control performance element to control to electrically connect with each filter branch of harmonics filter units；
Above-mentioned isolation shaping unit includes isolating transformer TA, current-limiting resistance R1, Zener diode D1 and rectification two pole
Pipe D2；The primary input terminal of isolating transformer TA is the input of above-mentioned isolation shaping unit；Isolating transformer TA's is secondary
Level outfan includes a terminals and b terminals；One end of current-limiting resistance R1 connects with a of the secondary output end of isolating transformer TA
Line end electrically connects；The other end of current-limiting resistance R1 has common junction with the negative pole of Zener diode D1；Zener diode D1's
Positive pole just has common junction with commutation diode D2's, and these 2 common junction collectively form above-mentioned isolation shaping unit
Outfan；The negative pole of commutation diode D2 electrically connects with the b terminals of the secondary output end of isolating transformer TA；
Above-mentioned Phototube Coupling unit includes current-limiting resistance R2, protection diode D3 and photoelectrical coupler G1；Photoelectric coupling
Device G1 includes light emitting diode and phototriode；The light emitting diode of the protection positive pole of diode D3 and photoelectrical coupler G1
Negative pole has common junction, and one end of this common junction and current-limiting resistance R2 collectively forms the input of above-mentioned Phototube Coupling unit
End；The protection negative pole of diode D3, the positive pole of light emitting diode of photoelectrical coupler G1 and the other end of current-limiting resistance R2 are total to
Line；The emitter-base bandgap grading of the phototriode of photoelectrical coupler G1 is the power end of above-mentioned light-coupled isolation unit；Photoelectrical coupler G1
The colelctor electrode of phototriode be the outfan of above-mentioned light-coupled isolation unit；
Above-mentioned frequency detecting control unit is PLC programmable logic controller (PLC)；PLC programmable logic controller (PLC) has electricity
Source input, DC power output end VDD, signal input part I1 and signal output part Y1 to Yn, wherein n is for filter with above-mentioned harmonic wave
The natural number that in ripple unit, the numerical value of filter branch number N is identical；The DC power output end VDD of PLC programmable logic controller (PLC)
It is the power output end of above-mentioned frequency detecting control unit；The signal input part I1 of PLC programmable logic controller (PLC) is
The signal input part of above-mentioned frequency detecting control unit；The signal output part Y1 to Yn of PLC programmable logic controller (PLC) is common
Constitute the signal output part of above-mentioned frequency detecting control unit.
Further scheme is: above-mentioned control performance element includes the first relay group and the second relay group；First
Relay group is made up of relay K A1 to KAn；Second relay group is made up of relay K M1 to KMn, and wherein n is humorous with above-mentioned
The natural number that in ripple filter unit, the numerical value of filter branch number N is identical；The input of each first relay K A of the first relay group
End collectively forms the above-mentioned control signal input controlling performance element；Each first relay K A of the first relay group normal
Open between corresponding second relay K M and the civil power Va that contact is serially connected in the second relay group；Each the second of second relay group is continued
The normally opened contact of electrical equipment KM is serially connected with in the corresponding filter branch of above-mentioned harmonics filter units.
This utility model has a positive effect: the intermediate frequency furnace harmonic filter system of (1) low cost of the present utility model, its
In use by the frequency of the intermediate frequency power supply of detection intermediate frequency furnace in real time, control harmonic list accordingly according to real-time IF-FRE
The conducting of the filter branch in unit puts into or excision, guarantees that the filter branch tuned frequency being put into is less than intermediate frequency furnace intermediate frequency simultaneously
The harmonic frequency produced, thus harmonic filtering installation can be avoided completely the most humorous to the amplification of the uncharacteristic harmonics that intermediate frequency produces
Shake, it is ensured that harmonic filtering installation and the safety of network system.(2) the intermediate frequency furnace harmonic system of low cost of the present utility model
System, simple in construction, cost are relatively low, realization is convenient, safe and reliable to operation.
Accompanying drawing explanation
Fig. 1 is circuit structure schematic block diagram of the present utility model；
Fig. 2 is the electrical schematic diagram of a kind of specific embodiment in Fig. 1 in addition to harmonics filter units；
Fig. 3 is the electrical schematic diagram of a kind of specific embodiment of harmonics filter units in Fig. 1；Figure also show itself and intermediate frequency
The electrical connection controlling performance element in power supply, electrical network supply transformer and Fig. 2.
Reference in above-mentioned accompanying drawing is as follows:
Isolation shaping unit 1, Phototube Coupling unit 2, frequency detecting control unit 3, control performance element 4, harmonic
Unit 5, intermediate frequency power supply 6, mid-frequency melting furnace 7.
Detailed description of the invention
With detailed description of the invention, this utility model is described in further detail below in conjunction with the accompanying drawings.
(embodiment 1)
Seeing Fig. 1 to Fig. 3, the intermediate frequency furnace harmonic filter system of the low cost of the present embodiment, for powering to mid-frequency melting furnace 7
The harmonic of intermediate frequency power supply 6, its mainly by isolation shaping unit 1, Phototube Coupling unit 2, frequency detecting control unit 3,
Control performance element 4 and harmonics filter units 5 forms.
Isolation shaping unit 1 is real-time for be transformed to by the ac voltage signal that intermediate frequency power supply 6 exports with intermediate frequency power supply 6
The pulse signal that frequency is equal；The input of isolation shaping unit 1 electrically connects with the outfan of intermediate frequency power supply 6.
Frequency detecting control unit 3 is used for detecting intermediate frequency power supply 6 ongoing frequency signal and sending harmonic switching accordingly
Control command.
Light-coupled isolation unit 2 couples for being isolated with frequency detecting control unit 3 and realize signal by isolation shaping unit 1
Transmission；The input of light-coupled isolation unit 2 electrically connects with the outfan of isolation shaping unit 1；The letter of frequency detecting control unit 3
Number input electrically connects with the output end signal of light-coupled isolation unit 2；The power end of light-coupled isolation unit 2 controls with frequency detecting
The power output end electrical connection of unit 3；
Harmonics filter units 5 is for the harmonic to intermediate frequency power supply 6；It include N number of tuned frequency from low to high with
The filter branch of intermediate frequency power supply 6 parallel connection, wherein N is the natural number more than 1；
Control performance element 4 and control in harmonics filter units 5 corresponding for the order according to frequency detecting control unit 3
The input of filter branch and excision；The control signal input controlling performance element 4 is defeated with the signal of frequency detecting control unit 3
Go out end electrical connection；Control performance element 4 to control to electrically connect with each filter branch of harmonics filter units 5.
Referring to Fig. 2 and Fig. 3, as the preferred mode of one, aforesaid isolation shaping unit 1 is main by isolating transformer
TA, current-limiting resistance R1, Zener diode D1 and commutation diode D2 composition；The primary input terminal of isolating transformer TA is (in Fig. 2
A, B terminals) it is the input isolating shaping unit 1；The secondary output end of isolating transformer TA includes that a terminals and b connect
Line end；One end of current-limiting resistance R1 electrically connects with a terminals of the secondary output end of isolating transformer TA；Current-limiting resistance R1's is another
One end has common junction with the negative pole of Zener diode D1；The positive pole of Zener diode D1 is the most great with commutation diode D2's
Having common junction, these 2 common junction collectively form the outfan of isolation shaping unit 1；The negative pole of commutation diode D2 with every
B terminals electrical connection from the secondary output end of transformator TA.Current-limiting resistance R1, Zener diode D1, commutation diode D2 group
Become limiter shaping circuit；The intermediate frequency power supply rectification of AC sine is that half-wave, voltage amplitude are by voltage stabilizing two by limiter shaping circuit
The pulse signal equal with IF-FRE that pole pipe D1 limits.
Phototube Coupling unit 2 is mainly made up of current-limiting resistance R2, protection diode D3 and photoelectrical coupler G1；Photoelectric coupling
Device G1 includes light emitting diode and phototriode；The light emitting diode of the protection positive pole of diode D3 and photoelectrical coupler G1
Negative pole has common junction, and one end of this common junction and current-limiting resistance R2 collectively forms the input of Phototube Coupling unit 2；Protect
Protect the positive pole of the light emitting diode of the negative pole of diode D3, photoelectrical coupler G1 and the other end conllinear of current-limiting resistance R2；Light
The emitter-base bandgap grading of the phototriode of electric coupler G1 is the power end of light-coupled isolation unit 2；Photosensitive three poles of photoelectrical coupler G1
The colelctor electrode of pipe is the outfan of aforesaid light-coupled isolation unit.
Frequency detecting control unit 3 preferably employs PLC programmable logic controller (PLC)；PLC programmable logic controller (PLC) has
The power input Va of external AC220V civil power, N, the DC power output end VDD of output 24V DC source and signal input
End I1 and signal output part Y1 to Yn, wherein n is identical with the numerical value of filter branch number N in aforesaid harmonics filter units 5
Natural number；The DC power output end VDD of PLC programmable logic controller (PLC) is the electricity of aforesaid frequency detecting control unit 3
Source output terminal；The signal that the signal input part I1 of PLC programmable logic controller (PLC) is aforesaid frequency detecting control unit 3 is defeated
Enter end；The signal output part Y1 to Yn of PLC programmable logic controller (PLC) collectively forms the letter of aforesaid frequency detecting control unit 3
Number outfan.
Control performance element 4 and include the first relay group and the second relay group；First relay group is by relay K A1 extremely
KAn forms；Second relay group is made up of relay K M1 to KMn, and wherein n is and filtering in aforesaid harmonics filter units
The natural number that the numerical value of way N is identical；The input of each first relay K A of the first relay group collectively forms aforesaid control
The control signal input of performance element 4 processed；The normally opened contact of each first relay K A of the first relay group is serially connected in second
Between corresponding second relay K M and the AC220V civil power Va of relay group；Each second relay K M of the second relay group
Normally opened contact is serially connected with in the corresponding filter branch of harmonics filter units 5.Each first relay K A in first relay group is
Auxiliary reclay, controls the most each second relay K M coil of the second relay group by the first relay K A normally opened contact
Conducting, thus control the Guan Bi of each corresponding second relay K M normally opened contact so that the corresponding filtering of harmonics filter units 5
Branch road conducting puts into, and controls to perform reliably.
Harmonics filter units 5 is made up of N number of filter branch, and N is the natural number more than 1；Each filter branch and intermediate frequency power supply
6 are connected in parallel on the outfan of transformator T of electrical network end.Filter branch is from 1 to N, and corresponding tuned frequency increases successively, respectively
The tuned frequency of filter branch carries out relative set according to the concrete condition of intermediate frequency furnace time actually used.Such as: certain intermediate frequency furnace is whole
Stream mode is 12 arteries and veins rectifications, and characteristic harmonics is mainly 11,13,23,25 times, from blow-on to completing melting IF-FRE excursion
For 110Hz～210Hz, the uncharacteristic harmonics frequency produced at alternating current source is 170～to 370Hz, then filter branch tuning
Frequency configuration: first via 149Hz, the second road 146Hz, the 3rd road 345Hz..Along with the rising of IF-FRE, progressively tuned frequency
Ascending put into successively, both characteristic harmonics has been had well absorption, the amplification even resonance of uncharacteristic harmonics can be avoided again.
The intermediate frequency furnace harmonic filter system of the low cost of the present embodiment, its method of work operationally includes harmonic
The input of the filter branch of unit 5 and cutting method, wherein the input method of the filter branch of harmonics filter units 5 includes following
Step:
1. the voltage signal of intermediate frequency power supply 6 is detected by isolation shaping unit 1 in real time, and will be transformed to and intermediate frequency power supply 6
The pulse signal that real-time frequency is equal is sent to frequency detecting control unit 3 through Phototube Coupling unit 2；
2. the frequency signal that frequency detecting control unit 3 real-time sampling Phototube Coupling unit 2 sends, obtains intermediate frequency power supply 6
Real-time IF-FRE f；
3. frequency detecting control unit 3 is by the tuned frequency that do not puts in real-time IF-FRE f and harmonics filter units 5
The little tuned frequency corresponding to filter branch contrasts, if IF-FRE f props up less than the current filtering participating in contrast in real time
The tuned frequency on road, then be failure to actuate；If IF-FRE f is more than the tuned frequency of the current filter branch participating in contrast in real time, then
Frequency detecting control unit 3 connects this filter branch in harmonics filter units 5 by control performance element 4 makes it put into；
4. step is repeated 1. to step 3., until the whole filter branch in harmonics filter units 5 are all put into by control.
The cutting method of the filter branch of harmonics filter units 5 comprises the following steps:
5. the voltage signal of intermediate frequency power supply 6 is detected by isolation shaping unit 1 in real time, and will be transformed to and intermediate frequency power supply 6
The pulse signal that real-time frequency is equal is sent to frequency detecting control unit 3 through Phototube Coupling unit 2；
6. the frequency signal that frequency detecting control unit 3 real-time sampling Phototube Coupling unit 2 sends, obtains intermediate frequency power supply 6
Real-time IF-FRE f；
7. frequency detecting control unit 3 is by the tuned frequency put into last in real-time IF-FRE f and harmonics filter units 5
The maximum tuned frequency corresponding to filter branch contrasts, if IF-FRE f is more than the current filtering participating in contrast in real time
The tuned frequency of branch road, then be failure to actuate；If IF-FRE f is less than the tuned frequency of the current filter branch participating in contrast in real time,
Then frequency detecting control unit 3 disconnects this filter branch in harmonics filter units 5 make it excise by controlling performance element 4；
8. step is repeated 5. to step 7., until the whole filter branch in harmonics filter units are all excised by control.
Above example is the explanation to detailed description of the invention of the present utility model, rather than to restriction of the present utility model,
Person skilled in the relevant technique is in the case of without departing from spirit and scope of the present utility model, it is also possible to make various change
Changing and change and obtain the technical scheme of corresponding equivalent, it is new that the technical scheme of the most all equivalents all should be included into this practicality
The scope of patent protection of type.
Claims (1)
1. an intermediate frequency furnace harmonic filter system for low cost, including the intermediate frequency power supply powered for mid-frequency melting furnace, its feature exists
In: also include:
Isolation shaping unit, for being transformed to the arteries and veins equal with the real-time frequency of intermediate frequency power supply by intermediate frequency power supply ac voltage signal
Rush signal；The input of isolation shaping unit electrically connects with the outfan of intermediate frequency power supply；
Frequency detecting control unit, is used for detecting intermediate frequency power supply ongoing frequency signal and sending harmonic switching accordingly controlling life
Order；
Light-coupled isolation unit, for isolating isolation shaping unit and frequency detecting control unit and realize signal coupled transfer；
The input of light-coupled isolation unit electrically connects with the outfan of isolation shaping unit；The signal input part of frequency detecting control unit
Electrically connect with the output end signal of light-coupled isolation unit；The power end of light-coupled isolation unit and the power supply of frequency detecting control unit
Outfan electrically connects；
Harmonics filter units, for the harmonic to intermediate frequency power supply；It include N number of tuned frequency different with intermediate frequency power supply also
The filter branch of connection, wherein N is the natural number more than 1；
Control performance element, control corresponding filtering in harmonics filter units for the order according to frequency detecting control unit
The input on road and excision；The signal output part of the control signal input and frequency detecting control unit that control performance element is electrically connected
Connect；Control performance element to control to electrically connect with each filter branch of harmonics filter units；
Described isolation shaping unit includes isolating transformer TA, current-limiting resistance R1, Zener diode D1 and commutation diode D2；
The primary input terminal of isolating transformer TA is the input of described isolation shaping unit；The secondary output of isolating transformer TA
End includes a terminals and b terminals；One end of current-limiting resistance R1 is electric with a terminals of the secondary output end of isolating transformer TA
Connect；The other end of current-limiting resistance R1 has common junction with the negative pole of Zener diode D1；The positive pole of Zener diode D1 with
Commutation diode D2 just has common junction, and these 2 common junction collectively form the output of described isolation shaping unit
End；The negative pole of commutation diode D2 electrically connects with the b terminals of the secondary output end of isolating transformer TA；
Described Phototube Coupling unit includes current-limiting resistance R2, protection diode D3 and photoelectrical coupler G1；Photoelectrical coupler G1
Including light emitting diode and phototriode；The positive pole of protection diode D3 and the negative pole of the light emitting diode of photoelectrical coupler G1
Having common junction, one end of this common junction and current-limiting resistance R2 collectively forms the input of described Phototube Coupling unit；
Protect positive pole and the other end conllinear of current-limiting resistance R2 of the light emitting diode of the negative pole of diode D3, photoelectrical coupler G1；
The emitter-base bandgap grading of the phototriode of photoelectrical coupler G1 is the power end of described light-coupled isolation unit；The light of photoelectrical coupler G1
The colelctor electrode of quick audion is the outfan of described light-coupled isolation unit；
Described frequency detecting control unit is PLC programmable logic controller (PLC)；It is defeated that PLC programmable logic controller (PLC) has power supply
Entering end, DC power output end VDD, signal input part I1 and signal output part Y1 to Yn, wherein n is and described harmonic list
The natural number that in unit, the numerical value of filter branch number N is identical；The DC power output end VDD of PLC programmable logic controller (PLC) is
The power output end of described frequency detecting control unit；The signal input part I1 of PLC programmable logic controller (PLC) is described
The signal input part of frequency detecting control unit；The signal output part Y1 to Yn of PLC programmable logic controller (PLC) collectively forms
The signal output part of described frequency detecting control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620544851.7U CN205753409U (en) | 2015-12-30 | 2015-12-30 | A kind of intermediate frequency furnace harmonic filter system of low cost |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620544851.7U CN205753409U (en) | 2015-12-30 | 2015-12-30 | A kind of intermediate frequency furnace harmonic filter system of low cost |
| CN201521134262.3U CN205377289U (en) | 2015-12-30 | 2015-12-30 | Intermediate frequency furnace harmonic filtering system |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521134262.3U Division CN205377289U (en) | 2015-12-30 | 2015-12-30 | Intermediate frequency furnace harmonic filtering system |
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| CN205753409U true CN205753409U (en) | 2016-11-30 |
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| CN201620544851.7U Expired - Fee Related CN205753409U (en) | 2015-12-30 | 2015-12-30 | A kind of intermediate frequency furnace harmonic filter system of low cost |
| CN201521134262.3U Expired - Fee Related CN205377289U (en) | 2015-12-30 | 2015-12-30 | Intermediate frequency furnace harmonic filtering system |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201521134262.3U Expired - Fee Related CN205377289U (en) | 2015-12-30 | 2015-12-30 | Intermediate frequency furnace harmonic filtering system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441664A (en) * | 2019-08-30 | 2019-11-12 | 国网江苏省电力有限公司电力科学研究院 | A kind of lower Partial Discharge Measurement System of harmonic voltage effect |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108539745B (en) * | 2015-12-30 | 2019-07-09 | 江苏省电力公司常州供电公司 | A kind of working method of intermediate frequency furnace harmonic filter system |
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2015
- 2015-12-30 CN CN201620544851.7U patent/CN205753409U/en not_active Expired - Fee Related
- 2015-12-30 CN CN201521134262.3U patent/CN205377289U/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441664A (en) * | 2019-08-30 | 2019-11-12 | 国网江苏省电力有限公司电力科学研究院 | A kind of lower Partial Discharge Measurement System of harmonic voltage effect |
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| CN205377289U (en) | 2016-07-06 |
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