CN207967943U - A kind of Active Power Filter-APF - Google Patents
A kind of Active Power Filter-APF Download PDFInfo
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- CN207967943U CN207967943U CN201721156281.5U CN201721156281U CN207967943U CN 207967943 U CN207967943 U CN 207967943U CN 201721156281 U CN201721156281 U CN 201721156281U CN 207967943 U CN207967943 U CN 207967943U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/20—Active power filtering [APF]
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Abstract
The utility model embodiment discloses a kind of Active Power Filter-APF, including：Phaselocked loop, current transformer, low-pass filter, digital signal processor；The phaselocked loop, the current transformer, the low-pass filter are connected with the digital signal processor respectively；The load current I of the current transformer detection power grida、Ib、Ic, by the load current Ia、Ib、IcIt is sent to the digital signal processor；The digital signal processor is by the load current Ia、Ib、IcI under from abc coordinate system transformations to dq coordinate systemsd、iq, by the idWith the iqIt is sent to the low-pass filter；The low-pass filter filters out the idWith the iqAC compounent obtain INdAnd INq, by the INdWith the INqIt is sent to the digital signal processor；The digital signal processor is by the INdWith the INqInverse transformation is carried out, n times harmonic current is obtained.Using the technical solution of the utility model embodiment, harmonic current can be quickly detected, it is convenient and simple.
Description
Technical field
The present invention relates to electric power networks technical field, more particularly to a kind of Active Power Filter-APF.
Background technology
With the rapid development of power electronic technique, the application of nonlinear load results in the harmonic pollution problems of power grid,
Endanger electric system and the normal table operation of each electric appliances.First have to solve the detection method of harmonic wave for the improvement of harmonic wave.
Harmonic detecting be handle harmonic problem premise and Active Power Filter-APF (Active Power Filter,
APF one of the key technology of harmonic compensation) is realized.
Currently, the harmonic detecting method that Active Power Filter-APF uses mainly has based on instantaneous reactive power theory and is based on
The harmonic detecting method of Fourier transformation.Harmonic detecting method principle based on instantaneous reactive power theory is simple, dynamic response
Speed is fast, but its accuracy of detection influenced by filter it is very big.Using the Fourier of Fourier transformation and many other improvements
The defects of spectrum leakage and barrage are easy to happen when change detection mains by harmonics.Theory of Instantaneous Reactive Power of Three-Phase Circuits is
The main foundation of APF development is theoretical, and Active Power Filter-APF is a kind of for dynamic harmonic wave, the novel electric power of compensating reactive power
Electronic device, the harmonic wave and the idle of variation that it can all change size and frequency compensate, and application can overcome passive
The shortcomings that inhibition of the conventional harmonics such as filter and reactive-load compensation method.
Currently, the speed of Active Power Filter-APF detection harmonic wave is slower, and the accuracy of the harmonic wave detected also needs further
It improves.
Invention content
The embodiment of the present invention provides a kind of Active Power Filter-APF, can quickly and accurately detect the harmonic wave in power grid
Electric current.
An embodiment of the present invention provides a kind of Active Power Filter-APFs, including：
Phaselocked loop, current transformer, low-pass filter, digital signal processor；
The phaselocked loop, the current transformer, the low-pass filter are connected with the digital signal processor respectively；
The phaselocked loop determines the phase angle θ of network voltage, and the θ is sent to the digital signal processor；It is described
Current transformer detects the load current I of power grida、Ib、Ic, by the load current Ia、Ib、IcIt is sent at the digital signal
Manage device；The digital signal processor is by the load current Ia、Ib、IcI under from abc coordinate system transformations to α β coordinate systemsα、
iβ, transformation matrix is determined according to the n times harmonic wave of required extraction and the θ, using the transformation matrix by the iα、iβFrom institute
State the i under α β coordinate system transformations to dq coordinate systemsd、iq, by the idWith the iqIt is sent to the low-pass filter, wherein institute
State idIncluding DC component INdAnd AC compounentThe iqIncluding DC component INqAnd AC compounentThe N be more than
Integer equal to 1；The low-pass filter filters out the idAC compounentObtain the INd, filter out the iqExchange point
AmountObtain the INq, by the INdWith the INqIt is sent to the digital signal processor；The digital signal processor
By the INdWith the INqInverse transformation is carried out, n times harmonic current is obtained.
In an optional implementation manner, the digital signal processor is specifically used for the N extracted needed for determining
Subharmonic determines that the transformation matrix, the transformation matrix are according to the θ and the N
In an optional implementation manner, the digital signal processor is specifically used for the iαWith the iβFrom institute
It is the i under the dq coordinate systems to state α β coordinate system transformationsdWith the iq, specific formula is as follows：
Wherein,
In an optional implementation manner, the digital signal processor is additionally operable to described according to the θ and described
Before N determines the transformation matrix, sin (N-1) θ, sin θ, cos (N-1) θ, cos θ are obtained；
The cosN θ and the sinN θ are calculated, specific formula is as follows：
In an optional implementation manner, the low-pass filter is the fertile hereby second-order low-pass filter of Bart；
The low-pass filter, specifically for filtering out the idAC compounentObtain the INd, the Bart is fertile
Hereby the cutoff frequency of second-order low-pass filter is set as 50Hz.
In an optional implementation manner, the digital signal processor is specifically used for the INdWith the INqFrom
The dq coordinate systems downconvert to the i under the α β coordinate systemsNαAnd iNβ, specific formula is as follows：
In an optional implementation manner, the digital signal processor is specifically used for the iNαWith the iNβBecome
It changes under the abc coordinate systems, specific formula is as follows：
In an optional implementation manner, the Active Power Filter-APF further includes：
Controller, input equipment；
The controller is electrically connected with the digital signal processor, the input equipment respectively；
The controller, the overtone order selection instruction sent by the input equipment for receiving user, according to institute
It states overtone order selection instruction and sends control instruction to the digital signal processor, the control instruction specifies the number letter
The overtone order extracted needed for number processor；
The digital signal processor is additionally operable to determine the required overtone order detected according to the control instruction.
In an optional implementation manner, the Active Power Filter-APF further includes：
Compensate current occuring circuit；
The compensation current occuring circuit is electrically connected with the digital signal processor；
The digital signal processor is additionally operable to generate current compensation instruction according to the n times harmonic current, to the benefit
It repays current occuring circuit and sends the current compensation instruction；
The compensation current occuring circuit is generated for being instructed according to the current compensation in compensation current compensation power grid
Harmonic current.
In an optional implementation manner, the digital signal processor is additionally operable to humorous in the n times according to required extraction
Before wave and the θ determine transformation matrix, the overtone order extracted needed for current time is determined according to preset rules.
As can be seen from the above technical solutions, the embodiment of the present invention has the following advantages：By being sat to load current
The variation of mark system and filtering can quickly detect the dq axis components of harmonic current, then carry out inverse transformation to the component and obtain harmonic wave electricity
Stream, it is quick and convenient.
Description of the drawings
Technical solution in order to illustrate the embodiments of the present invention more clearly or in background technology below will be implemented the present invention
Attached drawing illustrates needed in example or background technology.
Fig. 1 is a kind of active power filter system structure principle chart of the embodiment of the present invention；
Fig. 2 is active power filter structure schematic diagram of the embodiment of the present invention；
Fig. 3 is the front and back comparison of wave shape figure in q axis of load current filtering of the present invention；
Fig. 4 is active power filter structure schematic diagram of the embodiment of the present invention；
Fig. 5 is active power filter structure schematic diagram of the embodiment of the present invention；
Fig. 6 is harmonic detecting method flow diagram of the embodiment of the present invention.
Specific implementation mode
The embodiment of the present invention is described with reference to the attached drawing in the embodiment of the present invention.
An embodiment of the present invention provides a kind of active power filter system structure principle charts, as shown in Figure 1, left end is
The nonlinear load of AC power, right end generates harmonic current.Active Power Filter-APF is by instruction current computing circuit and compensation
Current occuring circuit forms, wherein compensation current occuring circuit includes current follow-up control circuit, driving circuit and main circuit
Three parts.The effect of instruction current computing circuit is the harmonic current detected in power grid；Compensate the effect of current occuring circuit
It is that the harmonic current control main circuit detected according to instruction current computing circuit generates the harmonic wave in compensation current compensation power grid
Electric current, to achieve the purpose that inhibit harmonic current.Active Power Filter-APF detects load current by current transformer, and leads to
Internal digital signal processor (Digital Signal Processing, DSP) calculating is crossed, is extracted humorous in load current
Wave component.
An embodiment of the present invention provides a kind of Active Power Filter-APFs, as shown in Fig. 2, including：
Phaselocked loop 201, current transformer 202, low-pass filter 203, digital signal processor 204；
Above-mentioned phaselocked loop 201, above-mentioned current transformer 202, above-mentioned low-pass filter 203 respectively at above-mentioned digital signal
Device 204 is managed to be connected；
Above-mentioned phaselocked loop 201 determines the phase angle θ of network voltage, and above-mentioned θ is sent to above-mentioned digital signal processor
204；Above-mentioned current transformer 202 detects the load current I of power grida、Ib、Ic, by above-mentioned load current Ia、Ib、IcIt is sent to
State digital signal processor 204；Above-mentioned digital signal processor 204 is by above-mentioned load current Ia、Ib、IcFrom abc coordinate system transformations
I under α β coordinate systemsα、iβ, transformation matrix is determined according to the n times harmonic wave of required extraction and above-mentioned θ, utilizes above-mentioned transformation square
Battle array is by above-mentioned iα、iβI under above-mentioned α β coordinate system transformations to dq coordinate systemsd、iq, by above-mentioned idWith above-mentioned iqIt is sent to above-mentioned low
Bandpass filter 203, wherein above-mentioned idIncluding DC component INdAnd AC compounentAbove-mentioned iqIncluding DC component INqWith exchange
ComponentAbove-mentioned N is the integer more than or equal to 1；Above-mentioned low-pass filter 203 filters out above-mentioned idAC compounentIt obtains
State INd, filter out above-mentioned iqAC compounentObtain above-mentioned INq, by above-mentioned INdWith above-mentioned INqIt is sent at above-mentioned digital signal
Manage device 204；Above-mentioned digital signal processor 204 is by above-mentioned INdWith above-mentioned INqInverse transformation is carried out, n times harmonic current is obtained.
Above-mentioned Active Power Filter-APF can detect load current by above-mentioned current transformer 202, and pass through above-mentioned number
Word signal processor 204 is calculated, and the harmonic components in load current are extracted.Current transformer is former according to electromagnetic induction
Reason, is made of the iron core and winding that are closed, can be used for the high current in alternating current circuit being converted to a certain proportion of low current,
It is used for measuring.The characteristics of phase-locked loop is a kind of feedback control circuit, phaselocked loop be：Utilize externally input reference signal
The frequency and phase of control loop internal oscillation signal.Because output signal frequency may be implemented to frequency input signal in phaselocked loop
From motion tracking, so phaselocked loop is commonly used in Closed loop track circuit.Phaselocked loop in the process of work, when the frequency of output signal
When rate is equal with the frequency of input signal, the phase difference value that output voltage and input voltage are kept fixed, i.e. output voltage with it is defeated
The phase for entering voltage is lockable.Therefore, above-mentioned phaselocked loop 201 can determine the phase angle θ of above-mentioned network voltage.The present invention is implemented
It does not provide to detect above-mentioned phase angle θ in example and detects the sequence of above-mentioned load current, can first detect above-mentioned phase angle θ and detect again
Above-mentioned load current can also detect above-mentioned phase angle θ and above-mentioned load current simultaneously, can also first detect above-mentioned load current
Above-mentioned phase angle θ is detected again.Above-mentioned digital signal processor 204 can determine the overtone order of extraction as needed, can also
The overtone order for needing to extract is determined according to specific setting information.For example, if above-mentioned digital signal processor 204 judges
The pollution of 7 subharmonic is more serious in above-mentioned power grid, then extracts 7 subharmonic, i.e., above-mentioned N is 7；Above-mentioned digital signal processor 204 can
To be instructed according to setting input by user, the harmonic wave of above-mentioned setting instruction is detected.
Above-mentioned abc coordinate systems are three-phase static coordinate system, and above-mentioned α β coordinate systems are two-phase stationary coordinate system, above-mentioned dq coordinates
System is two-phase synchronous rotating frame.
In the embodiment of the present invention, load current I of the phase angle by power grid of network voltage is first determined according to phaselocked loopa、Ib、
IcI under from abc coordinate system transformations to α β coordinate systemsα、iβ；N times harmonic wave and above-mentioned θ further according to required extraction determine transformation
Matrix, using above-mentioned transformation matrix by above-mentioned iα、iβI under above-mentioned α β coordinate system transformations to dq coordinate systemsd、iq；Finally, it filters
Except above-mentioned idAC compounentObtain above-mentioned INd, filter out above-mentioned iqAC compounentObtain above-mentioned INq, by above-mentioned INdWith
Above-mentioned INqInverse transformation is carried out, n times harmonic current is obtained.The embodiment of the present invention to load current by carrying out coordinate system variation and filter
Wave can quickly detect the dq axis components of harmonic current, then carry out inverse transformation to the component and obtain harmonic current, quick and convenient.
In an optional implementation manner, the digital signal processor 204 is specifically used for the institute extracted needed for determining
N times harmonic wave is stated, determines that the transformation matrix, the transformation matrix are according to the θ and the N
In the embodiment of the present invention, it may be determined that the harmonic wave of required detection, and according to the phase angle and required inspection detected
The harmonic wave of survey determines transformation matrix, calculates simple, quick.
In an optional implementation manner, the digital signal processor 204 is specifically used for the iαWith the iβ
It is the i under the dq coordinate systems from the α β coordinate system transformationsdWith the iq, specific formula is as follows：
Wherein,
In the embodiment of the present invention, can by load current from the α β coordinate system transformations be the dq coordinate systems.
In an optional implementation manner, the digital signal processor 204, be additionally operable to described according to the θ and
Before the N determines the transformation matrix, sin (N-1) θ, sin θ, cos (N-1) θ, cos θ are obtained；
The cosN θ and the sinN θ are calculated, specific formula is as follows：
In the embodiment of the present invention, cosN θ and sinN θ can be found out using N-1 subharmonic and fundamental wave, need not be carried out
It tables look-up repeatedly, it is only necessary to simple multiplying be passed through according to result before it is achieved that calculating simple, quick.
In an optional implementation manner, above-mentioned low-pass filter 203 is the fertile hereby second-order low-pass filter of Bart；
Above-mentioned low-pass filter 203, specifically for filtering out above-mentioned idAC compounentObtain above-mentioned INd, above-mentioned Bart
The cutoff frequency of fertile hereby second-order low-pass filter is set as 50Hz.
Fig. 3 is the front and back comparison of wave shape figure in q axis of load current filtering, as shown in figure 3, the fertile hereby second-order low-pass filter of Bart
Device can effectively filter out load currentAnd load currentHarmonic component, that is, AC compounent on q axis.
To be 50Hz by set of frequency using the fertile hereby second-order low-pass filter of Bart in the embodiment of the present invention, relative to
Other second-order low-pass filters, by the higher of set of frequency, dynamic is corresponding faster.
In an optional implementation manner, the digital signal processor 204 is specifically used for the INdWith it is described
INqThe i under the α β coordinate systems is downconverted to from the dq coordinate systemsNαAnd iNβ, specific formula is as follows：
In the embodiment of the present invention, filtered load current can be downconverted to the α β coordinates from the dq coordinate systems
System.
In an optional implementation manner, the digital signal processor 204 is specifically used for the iNαWith it is described
iNβIt transforms under the abc coordinate systems, specific formula is as follows：
Wherein, the INa, the INb, the INcFor the n times harmonic current in the power grid.
It, can be by filtered load current from α β coordinate system transformations to abc coordinate systems in the embodiment of the present invention.
In an optional implementation manner, as shown in figure 4, the Active Power Filter-APF further includes：
Controller 401, input equipment 403；
The controller 401 is electrically connected with the digital signal processor 204, the input equipment 403 respectively；
The controller 401, the overtone order selection instruction sent by the input equipment 403 for receiving user,
Control instruction is sent to the digital signal processor 204 according to the overtone order selection instruction, the control instruction is specified
The overtone order extracted needed for the digital signal processor 204；
The digital signal processor 204 is additionally operable to determine the required overtone order detected according to the control instruction.
For example, user can select 5 subharmonic of detection, 401 basis of above controller by above-mentioned input equipment 403
Above-mentioned input equipment 403 receives operational order and specifies above-mentioned number to the transmission of the digital signal processor 204 control instruction
Signal processor detects 5 subharmonic, after above-mentioned digital signal processor 204 receives above-mentioned control instruction, detects 5 subharmonic.
In the embodiment of the present invention, user can select the harmonic wave for needing to detect by input equipment, meet different user
Demand.
In an optional implementation manner, as shown in figure 5, the Active Power Filter-APF further includes：
Instruction current computing circuit 501, compensation current occuring circuit 502, instruction current computing circuit 501 include the lock
Phase ring 201, the current transformer 202, the low-pass filter 203, the digital signal processor 204；
Described instruction current operator circuit 501 is electrically connected with compensation current occuring circuit 502；
Described instruction current operator circuit 501 is additionally operable to generate current compensation instruction according to the n times harmonic current, to
The compensation current occuring circuit 502 sends the current compensation instruction；
The compensation current occuring circuit 502 generates compensation current compensation power grid for being instructed according to the current compensation
In harmonic current.
In the embodiment of the present invention, instruction current computing circuit detects load current using current transformer, and is counted by DSP
It calculates, extracts the harmonic components in load current, the command signal of compensation electric current, the compensated electric current of the command signal is calculated
Circuit amplification occurs, corresponding compensation electric current, the harmonic wave to be compensated in compensation electric current and load current and nothing are generated by main circuit
The electric currents such as work(offset, and finally obtain desired source current.
In an optional implementation manner, the digital signal processor 204 is additionally operable in the N according to required extraction
Before subharmonic and the θ determine transformation matrix, the overtone order extracted needed for current time is determined according to preset rules.
Above-mentioned preset rules can only detect the harmonic wave of specific times, such as 5 subharmonic, 7 subharmonic, 11 subharmonic；
Can also be detected successively according to the sequence of the detection harmonic wave of user setting, such as user can be arranged according to 3 subharmonic,
The sequence cycle progress harmonic detecting of 5 subharmonic, 7 subharmonic, 11 subharmonic, 3 subharmonic；It can also be each time according to current time
The pollution level of harmonic wave determines the n times harmonic wave extracted needed for current time；Above-mentioned Active Power Filter-APF can be according to receiving
Detection instruction determine needed for extract n times harmonic wave, such as above-mentioned Active Power Filter-APF receive control device transmission inspection
After surveying the instruction of 7 subharmonic, then 7 subharmonic are detected.
In the embodiment of the present invention, Active Power Filter-APF may be used various ways and determine the harmonic wave for needing to detect, and improve
Detection efficiency.Meet the harmonic detecting demand of different application scenarios.
Active Power Filter-APF can execute harmonic detecting method in the embodiment of the present invention, as shown in fig. 6, including：
601, Active Power Filter-APF APF determines the phase angle θ of network voltage using phaselocked loop；
602, load current, and the load current I that will be detected are detecteda、Ib、IcFrom abc coordinate system transformations to α β coordinate systems
Under iα、iβ；
603, by above-mentioned iα、iβI under above-mentioned α β coordinate system transformations to dq coordinate systemsd、iq；
604, above-mentioned i is filtered outdAC compounentObtain INd, filter out above-mentioned iqAC compounentObtain INq；
605, by above-mentioned INdWith above-mentioned INqThe i under above-mentioned α β coordinate systems is downconverted to from above-mentioned dq coordinate systemsNαAnd iNβ；
606, by above-mentioned iNαWith above-mentioned iNβIt transforms under above-mentioned abc coordinate systems, obtains n times harmonic current INa、INb、INc。
The embodiment of the present invention can quickly detect harmonic current by carrying out coordinate system variation and filtering to load current
Dq axis components, then to the component carry out inverse transformation obtain harmonic current, it is quick and convenient.It generates and loads by controlling inverter
Harmonic current is equal in magnitude, in the opposite harmonic current injection to above-mentioned power grid of direction, harmonic carcellation pollution.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or replace
It changes, these modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with right
It is required that protection domain subject to.
Claims (10)
1. a kind of Active Power Filter-APF, which is characterized in that including：
Phaselocked loop, current transformer, low-pass filter, digital signal processor；
The phaselocked loop, the current transformer, the low-pass filter are connected with the digital signal processor respectively；
The phaselocked loop determines the phase angle θ of network voltage, and the θ is sent to the digital signal processor；The electric current
Mutual inductor detects the load current I of power grida、Ib、Ic, by the load current Ia、Ib、IcIt is sent to the Digital Signal Processing
Device；The digital signal processor extracts the harmonic components in load current.
2. Active Power Filter-APF according to claim 1, which is characterized in that
The digital signal processor, is specifically used for the n times harmonic wave extracted needed for determining, and transformation is determined according to the θ and N
Matrix, the transformation matrix are
3. Active Power Filter-APF according to claim 2, which is characterized in that
The digital signal processor is specifically used for the load current Ia、Ib、IcFrom abc coordinate system transformations to α β coordinate systems
Under iα、iβ；By the iαWith the iβIt is the i under dq coordinate systems from α β coordinate system transformationsdAnd iq, specific formula is as follows：
Wherein,
4. Active Power Filter-APF according to claim 2, which is characterized in that
The digital signal processor, be additionally operable to it is described determine the transformation matrix according to the θ and the N before, obtain
sin(N-1)θ、sinθ、cos(N-1)θ、cosθ；
The cosN θ and the sinN θ are calculated, specific formula is as follows：
5. Active Power Filter-APF according to claim 3, which is characterized in that the low-pass filter is the fertile hereby second order of Bart
Low-pass filter；
The low-pass filter, specifically for filtering out the idAC compounentObtain the INd, the fertile hereby second order of the Bart
The cutoff frequency of low-pass filter is set as 50Hz.
6. Active Power Filter-APF according to claim 5, which is characterized in that
The digital signal processor is specifically used for the INdWith the INqThe α β are downconverted to from the dq coordinate systems to sit
I under mark systemNαAnd iNβ, specific formula is as follows：
7. Active Power Filter-APF according to claim 6, it is characterised in that
The digital signal processor is specifically used for the iNαWith the iNβIt transforms under the abc coordinate systems, specific formula
It is as follows：
Wherein, the INa, the INb, the INcFor the n times harmonic current in the power grid.
8. according to Active Power Filter-APF described in Claims 1-4 any one, which is characterized in that the active power filtering
Device further includes：
Controller, input equipment；
The controller is electrically connected with the digital signal processor, the input equipment respectively；
The controller, the overtone order selection instruction sent by the input equipment for receiving user, according to described humorous
Wave selection of times instructs to the digital signal processor and sends control instruction, and the control instruction is specified at the digital signal
Manage the overtone order extracted needed for device；
The digital signal processor is additionally operable to determine the required overtone order detected according to the control instruction.
9. Active Power Filter-APF according to claim 7, which is characterized in that the Active Power Filter-APF further includes：
Compensate current occuring circuit；
The compensation current occuring circuit is electrically connected with the digital signal processor；
The digital signal processor is additionally operable to generate current compensation instruction according to the n times harmonic current, to compensation electricity
Stream occurs circuit and sends the current compensation instruction；
The compensation current occuring circuit, for instructing the harmonic wave generated in compensation current compensation power grid according to the current compensation
Electric current.
10. according to Active Power Filter-APF described in Claims 1-4 any one, which is characterized in that
The digital signal processor, be additionally operable to according to the n times harmonic wave and the θ of required extraction determine transformation matrix it
Before, the overtone order extracted needed for current time is determined according to preset rules.
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| CN201721156281.5U CN207967943U (en) | 2017-09-08 | 2017-09-08 | A kind of Active Power Filter-APF |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208593A (en) * | 2019-06-10 | 2019-09-06 | 北京利达英杰联合技术有限公司 | A method of the detection electric current for electric fireproof current-limiting type protector |
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2017
- 2017-09-08 CN CN201721156281.5U patent/CN207967943U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208593A (en) * | 2019-06-10 | 2019-09-06 | 北京利达英杰联合技术有限公司 | A method of the detection electric current for electric fireproof current-limiting type protector |
| CN110208593B (en) * | 2019-06-10 | 2022-04-08 | 北京利达英杰联合技术有限公司 | Current detection method for electric fireproof current-limiting protector |
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