CN209070012U - It is a kind of for measuring the device of surge current - Google Patents
It is a kind of for measuring the device of surge current Download PDFInfo
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- CN209070012U CN209070012U CN201821525799.6U CN201821525799U CN209070012U CN 209070012 U CN209070012 U CN 209070012U CN 201821525799 U CN201821525799 U CN 201821525799U CN 209070012 U CN209070012 U CN 209070012U
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Abstract
Embodiment of the disclosure provides a kind of for measuring the device of surge current.The device includes pairs of sensor circuit, and coupling passes through the electric current of measured conductor and is configured to respond to the surge current on measured conductor generates the first induced voltage signal and the second induced voltage signal respectively；Waveform shaping circuit, it is coupled to sensor circuit and is configured as carrying out Integral Processing to induced voltage signal so that processed first induced voltage signal and the second induced voltage signal are mutually matched on waveform with surge current respectively, to generate the first shaping voltage signal and the second shaping voltage signal；And output circuit, it is coupled to waveform shaping circuit and is configured as carrying out difference operation to the first shaping voltage signal and the second shaping voltage signal, to obtain the signal of instruction surge current.Difference induced voltage signal is generated by using pairs of sensor circuit, can effectively be eliminated interference signal brought by surge current, be improved the accuracy of measurement result.
Description
Technical field
Embodiment of the disclosure relates generally to the device of measurement electric current, and more particularly, to for measuring surge
The device of electric current.
Background technique
Surge current refers to that power supply connects moment or what is generated in the case where abnormal conditions occurs in circuit is much larger than steady-state current
Peak point current or overload current, it is all critically important to the safety of supply network and electrical equipment.The source of power supply system surge point
It is external (thunder and lightning reason) and internal (electrical equipment start and stop and failure etc.).Power supply should limiting AC switch, rectifier bridge, insurance
The surge levels that silk, battery interference filter device can be born.In order to test the equipment when for example dispatching from the factory such as switchgear
Performance, it usually needs surge current is measured.Surge current can generate larger magnetic field around measured conductor, due to electromagnetism
Reasons and the severe jammings such as interference measure.
Utility model content
If surge current measuring device measured close to measured conductor, larger magnetic field caused by surge current
Generated larger interference signal is mixed in measuring signal, so that can not separate with measuring signal.This has seriously affected measurement
As a result accuracy.In traditional solution, in order to avoid magnetic field caused by surge current as far as possible, need to measure
The device of surge current is spaced apart at a distance with measured conductor.This brings inconvenience for measurement.However even if in this way, surge is electric
Magnetic field caused by flowing also can cause inevitable noise for measurement, so that measurement result is inaccurate.
In order to solve the problems, such as or at least partly solve that above-mentioned and other are potential, embodiment of the disclosure provides one
Plant the device for measuring surge current, inhibit with fully differential chain and eliminate interference signal brought by surge current to
Realize its accurate convenient measurement of surge current.
In the disclosure in a first aspect, providing a kind of device for measuring surge current.The device includes pairs of induction
Circuit is coupled to measured conductor and is configured to respond to the surge current on measured conductor and generates the first induced electricity respectively
Press signal and the second induced voltage signal；Waveform shaping circuit is coupled to sensor circuit and is configured as to induced voltage signal
Integral Processing is carried out so that processed first induced voltage signal and the second induced voltage signal are respectively with surge current in wave
It is mutually matched in shape, to generate the first shaping voltage signal and the second shaping voltage signal；And output circuit, it is coupled to waveform
It shaping circuit and is configured as carrying out difference operation to the first shaping voltage signal and the second shaping voltage signal, to be referred to
Show the signal of surge current.
It is according to an embodiment of the present disclosure for measuring the device of surge current, by differential signal chain and difference operation,
Common mode interference noise brought by surge current is effectively suppressed and eliminates, to only retain effective instruction surge current
Signal improves the accuracy of measurement result.In addition, the waveform of induced voltage can be reduced into surge electricity by waveform shaping circuit
The waveform of stream, to guarantee the consistency of measurement.
In some embodiments, output circuit further includes analog-to-digital conversion module, is configured as generating with digital signal form
Indicate the signal of surge current.By the arrangement, enables and more set with the measurement result of digital signal form instruction
It is standby to be used.Such as it can directly display on a display screen, or equipment can be analyzed and used to analyze on measured conductor
Switchgear performance etc..
In some embodiments, waveform shaping circuit includes: difference amplifier, is configured as: being believed the first induced voltage
Number and the second induced voltage signal carry out difference operation to generate the first differential signal and the second differential signal；And based on biasing
Voltage is superimposed common-mode voltage to the first differential signal and the second differential signal respectively, to generate the first offset signal and the second biasing
Signal；And integration module, it is coupled to difference amplifier, and be configured as to the first offset signal and the second offset signal point
Not carry out Integral Processing to convert waveform, to generate the first shaping voltage signal and the second shaping voltage signal.Pass through the cloth
It sets, enables the device to effectively inhibit measured signal common mode noise as caused by surge current, further increase measurement
As a result accuracy.
In some embodiments, integration module includes: pairs of integrating resistor, is arranged in sensor circuit and difference
Between the respective input of amplifier；And pairs of capacitor, be arranged in difference amplifier output end and corresponding input
On feedback loop between end.Integration module is realized by simple component, and shaping is restored to the waveform of measured signal.
In some embodiments, waveform shaping circuit further includes the drain resistor in parallel with capacitor, to be at least used for
The excess charge released in capacitor.By the drain resistor, extra electricity in the capacitor that on the one hand can effectively release
Lotus guarantees the accuracy of measuring circuit.On the other hand, capacitor and drain resistor are connected in parallel on the feedback loop of difference amplifier
On also constitute low-pass filter.By the way that the resistance value of capacitor and drain resistor is reasonably arranged, measured signal can be adjusted
Cutoff frequency range, further increase the accuracy of measurement result.But drain resistor and integrating resistor constitute volume
Outer DC current gain, influences signal measurement.There is low bias voltage and Low-bias Current differential amplification therefore, it is necessary to selection
Device.To reduce DC voltage, influence of the reduction to signal.
In some embodiments, which further includes buffer circuit, is arranged in output end
Between output circuit, and it is suitable for providing charge buffer in no surge current signal for output circuit.In this manner it is possible to
Effectively guarantee to can satisfy the demand of conversion circuit conversion circuit sample frequency with higher, to ensure that survey
The accuracy of amount.
In some embodiments, buffer circuit includes: pairs of snubber resistor, is arranged in output end and output
Between the corresponding conversion inputs of circuit；And pairs of buffer condenser, it is arranged in conversion inputs and ground connection
Between electrical voltage point.This is arranged such that the charge buffer that output circuit is had effectively achieved by simple circuit.
In some embodiments, pairs of sensor circuit includes the first coil and the second line for being coupled respectively to measured conductor
Circle, and one end of each coil in first coil and the second coil is respectively ground terminal；And first coil and the second line
The other end of each coil in circle is coupled respectively to waveform shaping circuit.By this method, it is realized by simple loop construction
The acquisition of surge current.
In some embodiments, first coil is identical with winding the number of turns of the second coil but winding direction is opposite.With this side
Formula simply and effectively produces the difference induced voltage about surge current and effectively inhibits the interference of external electromagnetic field,
It lays a good foundation for subsequent processing.
In some embodiments, first coil and the second coil are arranged on a printed circuit.By this method, so that surveying
It is more compact to measure device, and can further reduce the cost.
In some embodiments, the hole passed through for measured conductor is formed on PCB, first coil and the second coil enclose respectively
It is arranged around hole.By this arrangement, measuring device can more easily be coupled on measured conductor, ensure that the efficiency of measurement
And accuracy.
By the way that the explanation of exemplary embodiment, the further feature of the disclosure will become aobvious and easy referring to the drawings
See.It should be appreciated that utility model content part is not intended to the key or important feature of mark embodiment of the disclosure, also non-purport
For limiting the scope of the present disclosure.The other feature of the disclosure will be easy to understand by description below.
Detailed description of the invention
Describe the exemplary embodiment of the disclosure, the above-mentioned purpose of the disclosure and other mesh in more detail in conjunction with the accompanying drawings
, feature and advantage will be apparent, wherein in an exemplary embodiment of the disclosure, the identical usual table of appended drawing reference
Show identical component.
Fig. 1 shows the schematic block diagram of the device according to an embodiment of the present disclosure for being used to measure surge current, wherein also
Schematically show measured conductor；
Fig. 2 shows according to an embodiment of the present disclosure for measuring a kind of circuit realization side of the device of surge current
Formula；And
Fig. 3 shows the schematic diagram of sensor circuit according to an embodiment of the present disclosure.
Through attached drawing, the same or similar element is indicated using the same or similar appended drawing reference.
Specific embodiment
The disclosure is described referring now to several example embodiments.It should be appreciated that these embodiments are only for making ability
Field technique personnel better understood when and be achieved in the disclosure, rather than propose to the range of disclosed technique scheme any
The purpose of limitation describes.
As it is used herein, term " includes " and its variant will be read as meaning " including but not limited to " open
Term.Term "based" will be read as " at least based on part ".Term " one embodiment " and " embodiment " should be understood
" at least one embodiment ".Term " another embodiment " is interpreted as " at least one other embodiment ".Term " first ", " the
Two " etc. may refer to similar and different object.Other specific and implicit definition may be included below.Unless context
In addition it explicitly points out, otherwise the definition of term is consistent throughout the specification.
Since surge current can form biggish interference magnetic field around, how to accurately measure surge current is this field
Urgent problem to be solved.In traditional solution, in order to be reduced as far as the influence in interference magnetic field, measurement can only be made to fill
It sets and arranges that this brings inconvenience to measurement far from measured conductor.However nonetheless, between measured conductor (such as exchange
Between each circuitry phase of electricity between ground connection) interference can also be mixed in measuring signal and seriously interference measurement signal.This
Outside, measurement distance can't completely eliminate interference signal brought by interference magnetic field.At least due to many reasons above, solve at present
Certainly surge current measured by scheme is inaccurate, to affect the accuracy of the processes such as subsequent analysis.
Embodiment of the disclosure provide it is a kind of for measuring the device of surge current, to solve or at least partly to solve
Certainly above-mentioned and other potential problems of typical measuring arrangements.Some examples are described referring now to Fig. 1 to Fig. 3 to implement
Example.
Fig. 1 shows according to an embodiment of the present disclosure for measuring the schematic block diagram of the device of surge current.As schemed
Show, generally, what it is according to the embodiment of the present disclosure includes pairs of sensor circuit 101, waveform for measuring the device of surge current
Shaping circuit 102 and output circuit 103.Pairs of sensor circuit 101 is coupled to measured conductor 201 by mode appropriate, from
And it can there are generate induced voltage signal respectively in the case where surge current in measured conductor 201.It is retouched for the ease of subsequent
It states, induced voltage signal caused by the pairs of sensor circuit 101 is referred to as the first induced voltage signal and the second induction
Voltage signal.
Term referred to herein " pairs of " indicates that component or circuit defined by it are that occur and cooperate to make in pairs
, and these components or circuit are not necessarily identical component or circuit.For example, in some embodiments, at
Pair sensor circuit 101 can have symmetrical arrangement.Symmetrical arrangement can make difference induced voltage signal
Common mode interference signal more tends to consistent and can reduce complexity in circuits and be convenient for calculating.However, it is to be understood that
Asymmetrical arrangement is only exemplary, it is no intended to limit the protection scope of the disclosure.It is any other it is appropriate arrangement or
Circuit is also possible.For example, pairs of sensor circuit 101 can also use asymmetrical in some alternative embodiments
Arrangement.However, it is to be understood that it is similar, for hereinafter mentioned pairs of integrating resistor 1025, electricity
Container 1026, snubber resistor 1041 and buffer condenser 1042, a pair of or multipair component therein can also be using symmetrical
Arrangement or asymmetric arrangement, will not be described in great detail below.
Waveform shaping circuit 102 is coupled on sensor circuit, and can carry out Integral Processing to induced voltage signal.By
In the waveform of waveform and tested surge current by incuding induced voltage signal obtained, there are differential relationships, by this
Integral Processing, enable to processed first induced voltage signal and the second induced voltage signal respectively with the wave of surge current
Shape matches namely almost the same.For the ease of subsequent description, it is shaped after the first induced voltage signal and second induction
Voltage signal is referred to as the first shaping voltage signal and the second shaping voltage signal.
Output circuit 103 is coupled on waveform shaping circuit.Output circuit 103 can be to the first shaping voltage signal and
Two shaping voltage signals carry out difference operation, and the signal of instruction surge current is obtained with this.Due to the interference magnetic of surge current
Influence to each sensor circuit be it is identical, being formed by common mode interference noise can be effective by the difference operation
Ground removal.As can be seen that making it possible to be effectively removed due to surge electricity by the differential signal chain according to the embodiment of the present disclosure
Common mode interference noise brought by the interference such as stream magnetic field, is effectively guaranteed the accuracy of measurement.Waveform shaping circuit can have
The waveform of effect ground reduction surge current, to ensure that the consistency of measurement result.
It should be understood that signal obtained is to indicate that the signal of surge current means the signal after difference operation
It can the parameter such as carrying out size of the operation to finally obtain surge current with reference voltage again.In addition, according to actual need
It wants, obtained signal can be analog signal and be also possible to digital signal.For example, in some embodiments, output circuit 103
It further include analog-to-digital conversion module.Analog-to-digital conversion module can be indicated obtained signal in the form of digital signal.To
Measurement result is enabled more easily to be used directly to other various applications.For example, directly display or straight over the display
It connects by analytical equipment processing and the switchgear on measured conductor circuit is analyzed.
Output circuit 103 as shown in Figure 2 realizes above-mentioned function by chip.However, it is to be understood that above-mentioned
Embodiment about output circuit 103 is only exemplary, it is no intended to limit the protection scope of the disclosure.It is any other appropriate
Arrangement or circuit be all possible.For example, the difference operation module and analog-to-digital conversion module of output circuit 103 can use
Individual circuit is realized respectively.In some alternative embodiments, it can also show to the letter exported from waveform shaping circuit 102
It number first carries out analog-to-digital conversion however obtains the digital signal about surge current to two paths of signals carrying out difference operation.
In some embodiments, waveform shaping circuit 102 includes difference amplifier 1021 and integration module 1024.Difference is put
Big device 1021 can carry out difference operation to the first and second induced voltage signals to generate the first and second differential signals respectively.
The calculus of differences can also be effectively removed the common mode interference signal in induced voltage signal, to be further ensured that the standard of measurement
True property.In addition, difference amplifier 1021 can also be superimposed common-mode voltage based on bias voltage and to the first and second differential signals,
To generate the first offset signal and the second offset signal respectively.
As shown in Fig. 2, in some embodiments, common-mode voltage is superimposed by by difference amplifier 1021 to differential signal
Output common mode voltage is set above the voltage of 0V to realize.Such as in view of the driving of some output circuits 103 needs centainly
Voltage range signal caused by waveform shaping circuit 102 can be enable to have by the way that output common mode voltage is reasonably arranged
Effect ground drives subsequent output circuit 103.Of course, it will be understood that above-described embodiment is only exemplary, it is no intended to limit
The protection scope of the disclosure processed.Any other arrangement appropriate or circuit come the biasing for realizing output signal are also possible.
Such as select other difference amplifiers 1021 and in conjunction with individual biasing circuit by way of realize.
Although described above is difference amplifiers 1021 to have the function being biased to signal, for that can use
Differential signal for the output circuit 103 that drives, can also save the treatment process of the first and second differential signals biasing
Slightly.Integration module 1024 is coupled to difference amplifier 1021, can integrate to the first offset signal and the second offset signal
With restoring transformation waveform, the waveform of the waveform and surge current that make signal matches for processing, to generate the first and second shapings
Voltage signal.
In some embodiments, integration module 1024 can have pairs of resistor 1025 and capacitor 1026, wherein
For the ease of subsequent description, resistor 1025 is referred to as integrating resistor 1025.As shown in the exemplary circuit of Fig. 2, in pairs
Integrating resistor 1025 can be arranged in the corresponding input terminal 1022 of sensor circuit 101 and difference amplifier 1021
Between.Pairs of capacitor 1026 is arranged in the output end 1023 and corresponding input section 1022 of difference amplifier 1021
Between feedback loop on.
As shown in Fig. 2, in some embodiments, waveform shaping circuit 102 can also have in parallel with capacitor 1026
Drain resistor 1027.The charge that it is extra in capacitor 1026 that 1027 one side of drain resistor can release, to guarantee circuit
Accuracy.On the other hand, drain resistor 1027 and capacitor 1026 are connected in parallel on the feedback loop of difference amplifier 1021
Low-pass filter can also be constituted, makes it possible to retain the induced voltage signal of effective frequency and filters out unwanted induced voltage
Signal, and then guarantee the accuracy of measurement result.By the resistance value and capacitor 1026 that are suitably set drain resistor 1027
Capacitance, the cutoff frequency of low-pass filter can be adjusted, to improve adaptability.
In addition, the arrangement of integrating resistor 1025 and drain resistor 1027 as shown in Figure 2 also constitutes direct current
Gain circuitry can amplify induced voltage signal, can drive in favor of removal interference signal and more effectively subsequent output
Circuit 103.The exemplary embodiment of waveform shaping circuit 102 is described above in conjunction with attached drawing 2, integration module is shown
1024 and drain resistor 1027 be arranged in mirror image between each input/output terminal of difference amplifier 1021.It should be understood that
, waveform shaping circuit 102 described in attached drawing 2 is only exemplary, it is no intended to limit the protection scope of the disclosure.
Other any arrangements appropriate or circuit are also possible.For example, also can choose other in some alternative embodiments
Any suitable circuit realizes above-mentioned function.
In view of some output circuits 103 are using the sample mode of Approach by inchmeal, sample frequency is higher, and the sampling time is short,
And the charging time of capacitor is relatively long, this may be such that the accuracy of output circuit 103 reduces.In order to further increase
The accuracy of output circuit 103, in some embodiments, according to the embodiment of the present disclosure for measuring the device of surge current
100 further include buffer circuit 104, charge buffer can be provided for output circuit 103, to guarantee that the height of output circuit 103 is adopted
Sample frequency and accuracy.
In some embodiments, buffer circuit 104 may include pairs of snubber resistor 1041 and pairs of buffering electricity
Container 1042, as shown in Figure 2.Pairs of snubber resistor 1041 is arranged in output end 1023 and output circuit 103 is right
Between the conversion inputs 1031 answered.Pairs of buffer condenser 1042 can be arranged in conversion inputs 1031 and connect
Between ground voltage point.Of course, it will be understood that the above-mentioned embodiment about buffer circuit 104 is only exemplary, not purport
In the protection scope of the limitation disclosure.Any other arrangement appropriate or circuit are also possible.For example, in some embodiments
In, buffer circuit 104 can also be omitted.
In some embodiments, pairs of sensor circuit may include pairs of coil.For the ease of subsequent description, divide
It is also known as first coil 1013 and the second coil 1014.First coil 1013 and the second coil 1014 can use Rogowski coil.
Rogowski coil is due to being free of ferrimagnet, no hysteresis effect.And Rogowski coil is without magnetic saturation as thus measurement range can be from
The several amperes of electric currents to hundreds of kilo-amperes, so as to further increase the accuracy of measurement and the applicability of measuring device.
One end of first coil 1013 and each coil in the second coil 1014 can be common ground terminal, and the other end can
To be coupled to waveform shaping circuit 102 to come the voltage signal that exports induction.Differential signal in order to obtain, first coil 1013
It is identical with winding the number of turns of the second coil 1014 but winding direction is opposite.
In some embodiments, first coil 1013 and the second coil 1014 can be respectively disposed at printed circuit board
(PCB) on, as shown in Figure 3.This arrangement can make sensor circuit 101 or even entire measuring device is more compact and measurement is steady
It is qualitative higher.On PCB, the hole 105 passed through for measured conductor 201, and first coil 1013 and the second line can be set
Circle 1014 is arranged to carry out inductive surge electric current around the hole 105 respectively.In order to meet the needs of multiphase electricity in alternating current,
PCB is upper can be arranged multiple holes and surround the multiple first coils 1013 and the second coil 1014 of this some holes respectively, with can be same
When measure surge current on every phase conductor.In addition, the winding width of the distance between hole and coil can also be according to every phase
Pitch between conductor is reasonably arranged.
The dress of measurement surge current according to the exemplary embodiment of the disclosure is described above by conjunction with Fig. 1 to Fig. 3
It sets.It can be seen from the above description that the device of measurement surge current according to an embodiment of the present disclosure is by using difference chain,
Effectively eliminate huge common mode interference brought by surge current.And by using waveform shaping circuit, so that acquired
The waveform of waveform and measured surge current of induced voltage match, ensure that the consistency of measurement.Buffer circuit energy
Effectively charge buffer enough is provided for output circuit 103, further ensures the accuracy using frequency and measurement.
It should be understood that the embodiment in detail above of the disclosure is just for the sake of illustration or the original of the explanation disclosure
Reason, rather than limit the disclosure.Therefore, within the spirit and principle of the utility model, it is made it is any modification, equally replace
Generation, improvement etc., should be included within the scope of protection of this utility model.Meanwhile disclosure the attached claims are intended to cover
Lid falls into all changes and modification in the equivalent on the scope of the claims and boundary or range and boundary.
Claims (11)
1. a kind of device (100) for measuring surge current characterized by comprising
Pairs of sensor circuit (101) is coupled to measured conductor (201) and is configured to respond to the measured conductor
(201) surge current on and generate the first induced voltage signal and the second induced voltage signal respectively；
Waveform shaping circuit (102) is coupled to the sensor circuit and is configured as carrying out Integral Processing to induced voltage signal
So that processed first induced voltage signal and second induced voltage signal are respectively with the surge current in wave
It is mutually matched in shape, to generate the first shaping voltage signal and the second shaping voltage signal；And
Output circuit (103), be coupled to the waveform shaping circuit and be configured as to the first shaping voltage signal and
The second shaping voltage signal carries out difference operation, to obtain the signal for indicating the surge current.
2. according to claim 1 for measuring the device (100) of surge current, which is characterized in that the output circuit
(103) further include analog-to-digital conversion module, be configured as generating the signal for indicating the surge current with digital signal form.
3. according to claim 1 for measuring the device (100) of surge current, which is characterized in that the waveform shaping
Circuit (102) includes:
Difference amplifier (1021), is configured as:
Difference operation is carried out to first induced voltage signal and second induced voltage signal to generate the first difference letter
Number and the second differential signal；And
Common-mode voltage is superimposed to first differential signal and second difference respectively based on bias voltage, to generate first partially
Confidence number and the second offset signal；And
Integration module (1024) is coupled to the difference amplifier (1021), and is configured as to first offset signal
Integral Processing is carried out respectively with second offset signal to convert waveform, to generate the first shaping voltage signal and institute
State the second shaping voltage signal.
4. according to claim 3 for measuring the device (100) of surge current, which is characterized in that the integration module
(1024) include:
Pairs of integrating resistor (1025), is arranged in the sensor circuit (101) and the difference amplifier (1021)
Respective input (1022) between；And
Pairs of capacitor (1026) is arranged in the output end (1023) of the difference amplifier (1021) and corresponding defeated
Enter on the feedback loop between end (1022).
5. according to claim 4 for measuring the device (100) of surge current, which is characterized in that the waveform shaping
Circuit (102) further includes the drain resistor in parallel with the capacitor (1026) (1027), at least in no surge
The excess charge released in the capacitor (1026) when current signal.
6. according to claim 4 for measuring the device (100) of surge current, which is characterized in that further include buffering electricity
Road (104) is arranged between the output end (1023) and the output circuit (103), and is suitable for the output circuit
(103) charge buffer is provided.
7. according to claim 6 for measuring the device (100) of surge current, which is characterized in that the buffer circuit
(104) include:
Pairs of snubber resistor (1041) is arranged in the output end (1023) and the output circuit (103)
Between corresponding conversion inputs (1031)；And
Pairs of buffer condenser (1042), is arranged between the conversion inputs (1031) and ground voltage point.
8. according to claim 1 for measuring the device (100) of surge current, which is characterized in that the pairs of sense
Answering circuit (101) includes the first coil (1013) and the second coil (1014) for being coupled respectively to the measured conductor (201), and
And
One end of the first coil (1013) and each coil in second coil (1014) is respectively ground terminal；And
The other end of the first coil (1013) and each coil in second coil (1014) is coupled respectively to the waveform
Shaping circuit (102).
9. according to claim 8 for measuring the device (100) of surge current, which is characterized in that the first coil
(1013) identical with winding the number of turns of second coil (1014) but winding direction is opposite.
10. according to claim 8 for measuring the device (100) of surge current, which is characterized in that the first coil
(1013) it is arranged on a printed circuit board (pcb) with second coil (1014).
11. according to claim 10 for measuring the device (100) of surge current, which is characterized in that the printing electricity
The hole (105) passed through for the measured conductor (201), the first coil (1013) and second coil are formed on the plate of road
(1014) it is arranged respectively around the hole (105).
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| CN201821525799.6U CN209070012U (en) | 2018-09-18 | 2018-09-18 | It is a kind of for measuring the device of surge current |
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| CN201821525799.6U CN209070012U (en) | 2018-09-18 | 2018-09-18 | It is a kind of for measuring the device of surge current |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113533819A (en) * | 2020-04-20 | 2021-10-22 | 施耐德电气（中国）有限公司 | Current detection method and current detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113533819A (en) * | 2020-04-20 | 2021-10-22 | 施耐德电气（中国）有限公司 | Current detection method and current detection device |
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