CN208888302U - The measuring device of line current in a kind of electric system - Google Patents
The measuring device of line current in a kind of electric system Download PDFInfo
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- CN208888302U CN208888302U CN201821590662.9U CN201821590662U CN208888302U CN 208888302 U CN208888302 U CN 208888302U CN 201821590662 U CN201821590662 U CN 201821590662U CN 208888302 U CN208888302 U CN 208888302U
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Abstract
The utility model discloses a kind of measuring devices of line current in electric system, the relative distance between each magnetic induction intensity and any two uniaxial magnetic quantity sensor that controller can be generated according to three uniaxial magnetic quantity sensors calculates the current value of conducting wire to be measured, and the current value measured can be shown by display device.Only need to guarantee that three uniaxial magnetic quantity sensors are located at same straight line for three uniaxial magnetic quantity sensors, and the straight line and conducting wire to be measured are non-coplanar, first uniaxial magnetic quantity sensor, the magnetic susceptibility direction of second uniaxial magnetic quantity sensor and third uniaxial magnetic quantity sensor is equidirectional and the straight line that is parallel to where three uniaxial magnetic quantity sensors, during installation, relative position without fixed primary circuit conducting wire and three uniaxial magnetic quantity sensors, the current measurement to conducting wire to be measured can be realized in the case where avoiding the relative position of fixed primary circuit conducting wire and three uniaxial magnetic quantity sensors, and then reduce installation difficulty, improve the measurement accuracy to current in wire.
Description
Technical field
The utility model relates to wireline inspection field, in particular to the measuring device of line current in a kind of electric system.
Background technique
In the power system, line current is one of the important parameter that measurement is had in electric system, reflects electric power
System running state is the essential input variables of functions such as electric power system optimization operation, control, protection.Therefore, it is necessary to adopt
Line current is measured with certain technological means, and the precision and response speed that measure should meet electric system different function
Requirement.
The alternating current of conventional electric power system line is mainly measured using current transformer, but current transformer volume
Greatly, weight weight is connected in primary circuit, and installation requirement is high, and the current transformer based on mutual inductance principle cannot be surveyed accurately
Measure the DC current in line current；DC current can be measured using the current sensor of Hall effect principle, but also needed
Hall current sensor is connected in primary circuit, installation is inconvenient, meanwhile, Hall current mutual inductor is also required to magnetic core,
Therefore heavier-weight.In recent years, with the development of magnetic sensor technologies, anisotropic magnetoresistance, giant magnetoresistance and tunnel magnetoelectricity
The Magnetic Sensors such as resistance are introduced into electric system, for measuring line current, although the electric current made using single Magnetic Sensor
Sensor does not need directly to contact with primary circuit, does not need iron core or magnetic core；But must fix primary circuit conducting wire with
The relative position of Magnetic Sensor, that is to say, that high to the installation requirement of single Magnetic Sensor, installation slightly deviation will be to survey
Amount result has an impact.
Traditional the line current in electric system is measured using single Magnetic Sensor it can be seen that how to overcome
When, since the low problem of installation difficulty measurement accuracy caused greatly is those skilled in the art's urgent problem to be solved.
Utility model content
The embodiment of the present application provides a kind of measuring device of line current in electric system, solves sharp in the prior art
When being measured with single Magnetic Sensor to the line current in electric system, due to installation difficulty measurement accuracy caused greatly
Low problem.
In order to solve the above technical problems, the utility model provides a kind of measuring device of line current in electric system,
Include:
For acquiring the first uniaxial magnetic of the first magnetic induction intensity that conducting wire to be measured generates on the magnetic susceptibility direction of itself
Sensor；
Second for acquiring the second magnetic induction intensity that the conducting wire to be measured generates on the magnetic susceptibility direction of itself is single
Axial magnetic sensor；
For acquiring the third list for the third magnetic induction intensity that the conducting wire to be measured generates on the magnetic susceptibility direction of itself
Axial magnetic sensor；
It connect, uses with first uniaxial magnetic quantity sensor, the second uniaxial magnetic quantity sensor and third uniaxial magnetic quantity sensor respectively
According to first magnetic induction intensity, second magnetic induction intensity, the third magnetic induction intensity and first single shaft
Magnetic Sensor, second uniaxial magnetic quantity sensor, the relative distance between the third uniaxial magnetic quantity sensor calculate described to be measured
The controller of the current value of conducting wire；
It is connect with the controller, the display device for showing the current value；
Wherein, first uniaxial magnetic quantity sensor, second uniaxial magnetic quantity sensor and the third uniaxial magnetic quantity sensor
Positioned at same straight line, the straight line and the conducting wire to be measured are non-coplanar, first uniaxial magnetic quantity sensor, second uniaxial magnetic
The magnetic susceptibility direction of sensor and the third uniaxial magnetic quantity sensor is equidirectional and is parallel to the straight line.
Preferably, the relative distance is surveyed especially by the range sensor connecting with the controller.
Preferably, further includes:
Respectively with first uniaxial magnetic quantity sensor, second uniaxial magnetic quantity sensor and the third uniaxial magnetic quantity sensor
Connection, for respectively described first uniaxial magnetic quantity sensor, second uniaxial magnetic quantity sensor and third uniaxial magnetic sensing
The DC power supply of device offer DC voltage.
Preferably, the DC power supply includes the voltage-stablizer for being in stable state for adjusting the DC voltage.
Preferably, further includes:
It is connect with the DC power supply, when DC voltage for providing in the DC power supply is beyond threshold value, cuts off institute
State DC power supply and first uniaxial magnetic quantity sensor, second uniaxial magnetic quantity sensor and the third uniaxial magnetic quantity sensor
The overcurrent protective device of power supply circuit.
Preferably, the overcurrent protective device is specially fuse.
Preferably, further includes:
It is connect with the controller, the alarm dress for showing the current value alarm prompt in the display device
It sets.
Preferably, the warning device is specially buzzer and/or indicator light and/or speech player.
Preferably further include:
It is installed on the conducting wire to be measured, first uniaxial magnetic quantity sensor, second uniaxial magnetic quantity sensor and described
For shielding the shield of external magnetic field outside three uniaxial magnetic quantity sensor regions.
Preferably, the display device is specially LED touch display screen.
Compared with the prior art, in a kind of electric system provided by the utility model line current measuring device, control
Device processed can be according to the phase between each magnetic induction intensity and any two uniaxial magnetic quantity sensor that three uniaxial magnetic quantity sensors generate
It adjusts the distance and calculates the current value of conducting wire to be measured, and can show the current value measured by display device.For three single shafts
Magnetic Sensor only needs to guarantee that three uniaxial magnetic quantity sensors are located at same straight line, and the straight line and conducting wire to be measured are non-coplanar, first
The magnetic susceptibility direction of uniaxial magnetic quantity sensor, the second uniaxial magnetic quantity sensor and third uniaxial magnetic quantity sensor is equidirectional and is parallel to three
Straight line where uniaxial magnetic quantity sensor.During installation, without fixed primary circuit conducting wire and three uniaxial magnetic quantity sensors
The current measurement that relative position, i.e. position where three uniaxial magnetic quantity sensors will not influence conducting wire to be measured.So application is originally
Measuring device, can the realization pair in the case where avoiding the relative position of fixed primary circuit conducting wire and three uniaxial magnetic quantity sensors
The current measurement of conducting wire to be measured, and then installation difficulty is reduced, the measurement accuracy to current in wire is improved, in addition, passing through
Display device shows the current value measured, convenient for checking, improves work efficiency.
Detailed description of the invention
Fig. 1 forms signal for the measuring device of line current in a kind of electric system provided by the utility model embodiment
Figure；
Fig. 2 is a kind of current in wire instrumentation plan to be measured provided by the utility model embodiment；
Fig. 3 is another kind current in wire instrumentation plan to be measured provided by the utility model embodiment.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that the described embodiments are only a part of the embodiments of the utility model, instead of all the embodiments.
Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without making creative work
All other embodiment, fall within the protection scope of the utility model.
The core of the utility model is to provide a kind of measuring device of line current in electric system, can solve existing skill
When being measured using single Magnetic Sensor to the line current in electric system in art, due to the big caused measurement of installation difficulty
The low problem of accuracy.
It is with reference to the accompanying drawing and specific real in order to make those skilled in the art more fully understand the embodiment of the utility model
Applying mode, the utility model is described in further detail.
Fig. 1 forms signal for the measuring device of line current in a kind of electric system provided by the utility model embodiment
Figure, as shown in Figure 1, the device includes:
For acquiring the first uniaxial magnetic of the first magnetic induction intensity that conducting wire 1 to be measured generates on the magnetic susceptibility direction of itself
Sensor 10；
For acquiring the second uniaxial magnetic of the second magnetic induction intensity that conducting wire 1 to be measured generates on the magnetic susceptibility direction of itself
Sensor 11；
For acquiring the third uniaxial magnetic for the third magnetic induction intensity that conducting wire 1 to be measured generates on the magnetic susceptibility direction of itself
Sensor 12；
It is connect respectively with the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and third uniaxial magnetic quantity sensor 12,
For according to the first magnetic induction intensity, the second magnetic induction intensity, third magnetic induction intensity and the first uniaxial magnetic quantity sensor 10, second
Relative distance between uniaxial magnetic quantity sensor 11, third uniaxial magnetic quantity sensor 12 calculates the controller of the current value of conducting wire 1 to be measured
13；
It is connect with controller 13, for showing the display device 14 of current value；
Wherein, the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and third uniaxial magnetic quantity sensor 12 are located at same
One straight line, the straight line and conducting wire 1 to be measured are non-coplanar, the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and third list
The magnetic susceptibility direction of axial magnetic sensor 12 is equidirectional and is parallel to straight line.
Specifically, there are three uniaxial magnetic quantity sensor, respectively the first uniaxial magnetic quantity sensor 10, second is single in the present embodiment
Axial magnetic sensor 11, third uniaxial magnetic quantity sensor 12, as shown in Figure 1, three uniaxial magnetic quantity sensors are in space along straight line
Arrangement, the straight line where three uniaxial magnetic quantity sensors can be located at the arbitrary face of conducting wire 1 to be measured, can also be located at conducting wire 1 to be measured
Normal plane, as long as guarantee three uniaxial magnetic quantity sensors where straight line and conducting wire 1 to be measured it is non-coplanar, three uniaxial magnetic quantity sensors
Magnetic susceptibility direction is equidirectional and the straight line that is parallel to where three uniaxial magnetic quantity sensors.It is passed when placing the first uniaxial magnetic
It, can be respectively by the first uniaxial magnetic quantity sensor after sensor 10, the second uniaxial magnetic quantity sensor 11 and third uniaxial magnetic quantity sensor 12
10, the second uniaxial magnetic quantity sensor 11, third uniaxial magnetic quantity sensor 12 acquire conducting wire 1 to be measured and pass in galvanization in the first uniaxial magnetic
The first magnetic induction generated on the magnetic susceptibility direction of sensor 10, the second uniaxial magnetic quantity sensor 11 and third uniaxial magnetic quantity sensor 12 is strong
The step of degree, the second magnetic induction intensity and third magnetic induction intensity, three uniaxial magnetic quantity sensors acquire corresponding magnetic induction intensity
It is as follows:
First uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and third uniaxial magnetic quantity sensor 12 are placed in logical
Have in magnetic field caused by the conducting wire to be measured 1 of electric current, then to the first uniaxial magnetic quantity sensor 10,11 and of the second uniaxial magnetic quantity sensor
Third uniaxial magnetic quantity sensor 12 passes to DC voltage, the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and third list
Axial magnetic sensor 12 can export corresponding voltage signal, the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and third
The voltage signal that uniaxial magnetic quantity sensor 12 exports can be equivalent to the first uniaxial magnetic quantity sensor 10,11 and of the second uniaxial magnetic quantity sensor
The generated magnetic induction intensity on conducting wire 1 to be measured of third uniaxial magnetic quantity sensor 12, in addition, doing in order to avoid external environment
It disturbs, improves the voltage letter that the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and third uniaxial magnetic quantity sensor 12 export
It number can more accurately represent the magnetic of the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and third uniaxial magnetic quantity sensor 12
Induction, can be with measured in advance the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and third uniaxial magnetic quantity sensor
12 proportionality coefficient, then by the proportionality coefficient measured and the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and
The output voltage signal of three uniaxial magnetic quantity sensors 12 obtains the magnetic induction intensity of three uniaxial magnetic quantity sensors, at this time by three single shafts
The magnetic induction intensity that Magnetic Sensor measures is more accurate.The measurement of proportionality coefficient can be measured by experiment, as proportionality coefficient
It is that how much properly, can be determined according to experimental conditions, the utility model is simultaneously not construed as limiting.In addition, it should be noted that being
More accurate measurement result is obtained, should ensure that the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and third list
The DC voltage that axial magnetic sensor 12 applies has certain stability.
Display device 14 can be display device in the prior art, and as preferred embodiment, display device 14 is specific
For LED touch display screen.
It is preferably real in order to timely notification technique personnel in view of when display device 14 shows current value
Mode is applied, further includes the warning device being connect with controller 13, for showing the prompt of current value alarm in display device 14.It is excellent
Selection of land, warning device can specifically select buzzer and/or indicator light and/or speech player.
It is public to the calculating of the current value of conducting wire 1 to be measured below in order to make those skilled in the art more fully understand this programme
Formula is derived, and is specifically derived in two kinds of situation to the calculation formula of the current value of conducting wire 1 to be measured:
First, where the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and third uniaxial magnetic quantity sensor 12
Same straight line be located at for the normal plane of conducting wire 1 to be measured, i.e., by the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor
11 and third uniaxial magnetic quantity sensor 12 according to straight line arrangement be placed on the normal plane of conducting wire 1 to be measured, to the utility model
Controller 13 derives the calculating process of the current value of conducting wire 1 to be measured in embodiment, and detailed process is as follows:
Fig. 2 is a kind of current in wire instrumentation plan to be measured provided by the utility model embodiment.As shown in Fig. 2, figure
Small black origin shown in 2 indicates the position where conducting wire 1 to be measured, and 10 indicate the first uniaxial magnetic quantity sensor, and 11 indicate that second is single
Axial magnetic sensor, 12 indicate third uniaxial magnetic quantity sensor, x1、x2、 x3Respectively the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic
Sensor 11 and third uniaxial magnetic quantity sensor 12 arrive the distance of conducting wire 1 to be measured；θ1、θ2、θ3Respectively passed by three uniaxial magnetics
The angle in the magnetic susceptibility direction of the vertical line of the conducting wire to be measured 1 of sensor and three uniaxial magnetic quantity sensors；M is the first single-axis sensors
10 and second the distance between the single-axis sensors 11；N between the first single-axis sensors 10 and third single-axis sensors 12 away from
From.
When actually deriving, it is assumed that
It can be obtained according to the space geometry relationship than position shown in Ao-Sa farr's law and Fig. 2:
x1sinθ1=x2sinθ2 (4)
x2sinθ2=x3sinθ3 (5)
x2cosθ2-x1cosθ1=m (6)
-x3cosθ3+x1cosθ1=n (7)
In formula (1)~formula (7), IxIt is unknown quantity for the electric current of conducting wire to be measured 1 to be solved；B1、 B2、B3Respectively 3
The magnetic induction intensity that uniaxial magnetic quantity sensor measures is known quantity；x1、x2、 x3Respectively the first uniaxial magnetic quantity sensor 10, second
Uniaxial magnetic quantity sensor 11 and third uniaxial magnetic quantity sensor 12 arrive the distance of conducting wire 1 to be measured, are unknown quantitys；μ0For vacuum magnetic conductance
Rate is known constant；π is pi, is known constant.
Joint type (1)~formula (7) can acquire tested electric current Ix。
Specific solution procedure is as follows:
It can be obtained according to formula (1)~formula (5):
It enablesIt can then be obtained according to formula (1)~formula (3):
It can be obtained according to formula (6) and formula (7):
It can be obtained according to formula (4) and formula (5):
Joint type (10) and formula (11), can obtain:
Formula (9) are substituted into formula (12), and square can obtain after being transplanted:
Formula (8) substitution formula (13) can be obtained:
It enables:
Formula (15) substitution formula (14) can be obtained:
I in subtractive (16)2, it can obtain:
It enables:
Then formula (17) becomes:
Then solving formula (19) according to quadratic equation with one unknown radical formula can obtain:
Formula (20) calculated x3There are two values, can specifically delete a value according to the actual situation, retain another value.
Formula (20) substitution formula (16) can be found out into I2, and then I is found out, it can be asked using any one formula in formula (16)
Which equations I I out specifically selects, and can find out I determines according to actual conditions and then obtain electricity to be measured according to the following formula
Flow Ix:
It in the embodiment of the present application, is according between the first uniaxial magnetic quantity sensor 10 and the second uniaxial magnetic quantity sensor 11
The electric current of distance and the calculated conducting wire 1 to be measured of the distance between the first uniaxial magnetic quantity sensor 10 and third uniaxial magnetic quantity sensor 12
Value.In practical applications, the distance between the first single-axis sensors 10 and the second uniaxial magnetic quantity sensor 11 and can also be passed through
The distance between two uniaxial magnetic quantity sensors 11 and third uniaxial magnetic quantity sensor 12 or the first uniaxial magnetic quantity sensor 10 and third are uniaxial
The distance between Magnetic Sensor 12 and the distance between the second uniaxial magnetic quantity sensor 11 and third uniaxial magnetic quantity sensor 12 calculate to
The current value for surveying conducting wire 1 specifically selects the distance between which two uniaxial magnetic quantity sensor to calculate the current value of conducting wire 1 to be measured, can
Determines according to actual conditions, it the utility model and is not construed as limiting.
Second, one is pressed with the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and third uniaxial magnetic quantity sensor 12
Straight line is placed in the arbitrary face of conducting wire 1 to be measured, i.e. the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and third list
Same straight line where axial magnetic sensor 12 is not located at for the normal plane of conducting wire 1 to be measured, to the current value of conducting wire 1 to be measured
Calculation formula derived, process is as follows:
Fig. 3 is another kind current in wire instrumentation plan to be measured provided by the utility model embodiment.As shown in figure 3,
In the embodiment of the present application, illustrate problem in order to clearer, only depicted in Fig. 3 the first uniaxial magnetic quantity sensor 10 with it is to be measured
The specific location relationship of conducting wire 1, the specific location relationship and third of the second uniaxial magnetic quantity sensor 11 and conducting wire 1 to be measured are uniaxial
The specific location relationship of Magnetic Sensor 12 and conducting wire 1 to be measured can be found in the specific of the first uniaxial magnetic quantity sensor 10 and conducting wire 1 to be measured
Positional relationship, x1、x2、 x3Respectively the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and third uniaxial magnetic sensing
Device 12 arrives the distance of conducting wire 1 to be measured；θ1For conducting wire 1 to be measured and straight line the distance d and x where three uniaxial magnetic quantity sensors1Group
At angle complementary angle, as shown in figure 3, similarly θ2、θ3Straight line where conducting wire 1 respectively to be measured and three uniaxial magnetic quantity sensors
Distance and x2、x3The complementary angle of the angle of composition, is not drawn into Fig. 3；M is the first single-axis sensors 10 and the second uniaxial sensing
The distance between device 11；N is the distance between the first single-axis sensors 10 and third single-axis sensors 12.
When actually deriving, it is assumed that
It can be obtained according to the space geometry relationship than position shown in Ao-Sa farr's law and Fig. 2:
x1sinθ1=x2sinθ2=x3sinθ3 (4)
In formula (1)~formula (6), it is unknown quantity that I, which is the electric current of conducting wire to be measured to be solved,；B1、B2、 B3Respectively 3 lists
The magnetic induction intensity that axial magnetic sensor measures is known quantity；x1、x2、x3Respectively the first uniaxial magnetic quantity sensor 10, second is single
Axial magnetic sensor 11 and third uniaxial magnetic quantity sensor 12 arrive the distance of conducting wire 1 to be measured, are unknown quantitys.
It can be derived according to formula (1), (2), (3) and (4):
It can be derived according to formula (7):
It can be derived according to formula (1):
It can be derived according to formula (2):
It can be derived according to formula (3):
It can be derived according to formula (5) and (6):
Formula (4) square is obtained:
Joint type (12) and (13) obtain:
Formula (10) and formula (11) are substituted into formula (14), square can be obtained after transposition:
Formula (8) are substituted into formula (15), can be obtained:
It enables:
Formula (17) are substituted into formula (16), can be obtained:
I in subtractive (18)2, and arrange and can obtain:
It enables:
Then formula (19) becomes:
Formula (20) is calculated:
The x that formula (21) is calculated3There are two values, can specifically delete a value according to the actual situation, such as according to first
The specific location relationship of uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and third uniaxial magnetic quantity sensor 12 is deleted wherein
One undesirable value retains another satisfactory value.
Formula (21) substitution formula (18) can be found out into I2, and then I is found out, it can be asked using any one formula in formula (18)
Which equations I I out specifically selects, can determines according to actual conditions, find out after I to get to conducting wire 1 to be measured to
Survey electric current.
In practical applications, it is contemplated that the simplicity of calculating usually passes the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic
Sensor 11 and third uniaxial magnetic quantity sensor 12 are placed on the normal plane of conducting wire 1 to be measured by straight line.
The measuring device of line current in a kind of electric system provided by the utility model, controller can be according to three
The relative distance between each magnetic induction intensity and any two uniaxial magnetic quantity sensor that uniaxial magnetic quantity sensor generates calculates to be measured lead
The current value of line, and the current value measured can be shown by display device.Three uniaxial magnetic quantity sensors are only needed to protect
It demonstrate,proves three uniaxial magnetic quantity sensors and is located at same straight line, the straight line and conducting wire to be measured are non-coplanar, and the first uniaxial magnetic quantity sensor, second
The magnetic susceptibility direction of uniaxial magnetic quantity sensor and third uniaxial magnetic quantity sensor is equidirectional and is parallel to where three uniaxial magnetic quantity sensors
Straight line.During installation, the relative position without fixed primary circuit conducting wire and three uniaxial magnetic quantity sensors, i.e. three lists
Position where axial magnetic sensor will not influence the current measurement of conducting wire to be measured.So can kept away using this measuring device
Exempt to realize in the case where the relative position of fixed primary circuit conducting wire and three uniaxial magnetic quantity sensors and the electric current of conducting wire to be measured is surveyed
Amount, and then installation difficulty is reduced, the measurement accuracy to current in wire is improved, is measured in addition, being shown by display device
Current value improved work efficiency convenient for checking.
For precise measurement the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and third uniaxial magnetic quantity sensor 12
Between relative distance, on the basis of the above embodiments, the mode preferably implemented, relative distance especially by with control
What the range sensor that device 13 processed connects was surveyed.Range sensor is selected to measure the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic biography
Relative distance between sensor 11, third uniaxial magnetic quantity sensor 12 is a kind of preferably mode, does not represent only this one kind
Mode can also measure the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor by graduated scale etc. in practical applications
11, the relative distance between third uniaxial magnetic quantity sensor 12, specifically select which kind of device measure the first uniaxial magnetic quantity sensor 10,
Relative distance between second uniaxial magnetic quantity sensor 11, third uniaxial magnetic quantity sensor 12, the utility model are simultaneously not construed as limiting.It can
See, range sensor provided by the utility model, it can be to the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11, third
Relative distance between uniaxial magnetic quantity sensor 12 carries out high-precision measurement.
In order to facilitate measurement, on the basis of the above embodiments, the mode preferably implemented, further includes:
It is connect respectively with the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and third uniaxial magnetic quantity sensor 12,
For being respectively that the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and third uniaxial magnetic quantity sensor 12 provide direct current
The DC power supply of pressure.
It specifically can be the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and third in measuring device
Uniaxial magnetic quantity sensor 12 configures dedicated DC power supply, in actual measurement line current, without being individually again the first uniaxial magnetic
Sensor 10, the second uniaxial magnetic quantity sensor 11 and third uniaxial magnetic quantity sensor 12 match suitable DC power supply, and then can mention
Rise the property easy to use of this measuring device.
In order to promote the accuracy of measurement result, on the basis of the above embodiments, the mode preferably implemented, directly
Galvanic electricity source includes the voltage-stablizer for being in stable state for adjusting DC voltage.
Specifically, special voltage-stablizer can be configured for DC power supply, so that DC power supply can pass for the first uniaxial magnetic
Sensor 10, the second uniaxial magnetic quantity sensor 11 and third uniaxial magnetic quantity sensor 12 provide relatively stable DC voltage, can be effective
It avoids because of the direct current that the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and third uniaxial magnetic quantity sensor 12 provide
Spread of voltage and cause measurement result the case where error occur, so as to promote the accuracy of measurement result.
In view of being that the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and third uniaxial magnetic pass in DC power supply
When sensor 12 is powered, provided voltage is possible to that the first uniaxial magnetic quantity sensor 10,11 and of the second uniaxial magnetic quantity sensor can be exceeded
Third uniaxial magnetic quantity sensor 12 bears voltage (burning voltage), and the first uniaxial magnetic quantity sensor 10, second is uniaxial in order to prevent
Magnetic Sensor 11 and third uniaxial magnetic quantity sensor 12 are burned in overcurrent, on the basis of the above embodiments, preferably
The mode of implementation, further includes:
Connect with DC power supply, when DC voltage for providing in DC power supply is beyond threshold value, cutting DC power supply with
The overcurrent of the power supply circuit of first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and third uniaxial magnetic quantity sensor 12 is protected
Protection unit.Wherein, threshold value can be sensed according to the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and third uniaxial magnetic
The model and operating voltage of device 12 determine that overcurrent protective device can be preferably fuse.
In order to avoid extraneous magnetic field is to the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11, third uniaxial magnetic
The magnetic induction intensity of sensor 12 impacts, and on the basis of the above embodiments, the mode preferably implemented also is wrapped
It includes:
It is installed on conducting wire 1, the first uniaxial magnetic quantity sensor 10, the second uniaxial magnetic quantity sensor 11 and third uniaxial magnetic sensing to be measured
For shielding the shield of external magnetic field outside 12 region of device.Shield can be preferably manganese-zinc ferrite shield.
Detailed Jie has been carried out to the measuring device of line current in a kind of electric system provided by the utility model above
It continues.The principles of the present invention and embodiment are expounded with several examples herein, the explanation of above embodiments,
It is merely used to help understand the technical solution of the utility model and its core concept；Meanwhile for the general technology people of this field
Member, based on the idea of the present invention, there will be changes in the specific implementation manner and application range, in conclusion this
Description should not be construed as a limitation of the present invention, those skilled in the art, in the premise of not creative work
Under, modification, equivalent replacement, improvement for being made to the utility model etc. should be included in the application.
It should also be noted that, in the present specification, relational terms such as first and second and the like be used merely to by
One operation is distinguished with another operation, without necessarily requiring or implying there are any between these entities or operation
This actual relationship or sequence.Moreover, the similar word such as term " includes ", so that including the unit of a series of elements, equipment
Or system not only includes those elements, but also including other elements that are not explicitly listed, or further includes for this list
Member, equipment or the intrinsic element of system.
Claims (10)
1. the measuring device of line current in a kind of electric system characterized by comprising
The first uniaxial magnetic for acquiring the first magnetic induction intensity that conducting wire to be measured generates on the magnetic susceptibility direction of itself senses
Device；
For acquiring the second uniaxial magnetic of the second magnetic induction intensity that the conducting wire to be measured generates on the magnetic susceptibility direction of itself
Sensor；
For acquiring the third uniaxial magnetic for the third magnetic induction intensity that the conducting wire to be measured generates on the magnetic susceptibility direction of itself
Sensor；
It is connect respectively with first uniaxial magnetic quantity sensor, the second uniaxial magnetic quantity sensor and third uniaxial magnetic quantity sensor, is used for root
It is passed according to first magnetic induction intensity, second magnetic induction intensity, the third magnetic induction intensity and first uniaxial magnetic
Sensor, second uniaxial magnetic quantity sensor, the relative distance between the third uniaxial magnetic quantity sensor calculate the conducting wire to be measured
Current value controller；
It is connect with the controller, for showing the display device of the current value；
Wherein, first uniaxial magnetic quantity sensor, second uniaxial magnetic quantity sensor and the third uniaxial magnetic quantity sensor are located at
Same straight line, the straight line and the conducting wire to be measured are non-coplanar, first uniaxial magnetic quantity sensor, second uniaxial magnetic sensing
The magnetic susceptibility direction of device and the third uniaxial magnetic quantity sensor is equidirectional and is parallel to the straight line.
2. the measuring device of line current in electric system according to claim 1, which is characterized in that the relative distance
It is surveyed especially by the range sensor being connect with the controller.
3. the measuring device of line current in electric system according to claim 1, which is characterized in that further include:
Connect respectively with first uniaxial magnetic quantity sensor, second uniaxial magnetic quantity sensor and the third uniaxial magnetic quantity sensor
It connects, is used for respectively described first uniaxial magnetic quantity sensor, second uniaxial magnetic quantity sensor and the third uniaxial magnetic quantity sensor
The DC power supply of DC voltage is provided.
4. the measuring device of line current in electric system according to claim 3, which is characterized in that the DC power supply
Including the voltage-stablizer for being in stable state for adjusting the DC voltage.
5. the measuring device of line current in electric system according to claim 3, which is characterized in that further include:
It connect, when DC voltage for providing in the DC power supply is beyond threshold value, cuts off described straight with the DC power supply
The power supply in galvanic electricity source and first uniaxial magnetic quantity sensor, second uniaxial magnetic quantity sensor and the third uniaxial magnetic quantity sensor
The overcurrent protective device of circuit.
6. the measuring device of line current in electric system according to claim 5, which is characterized in that the overcurrent protection
Device is specially fuse.
7. the measuring device of line current in electric system according to claim 1, which is characterized in that further include:
It is connect with the controller, the warning device for showing the current value alarm prompt in the display device.
8. the measuring device of line current in electric system according to claim 7, which is characterized in that the warning device
Specially buzzer and/or indicator light and/or speech player.
9. the measuring device of line current in electric system according to claim 1, which is characterized in that further include:
It is installed on the conducting wire to be measured, first uniaxial magnetic quantity sensor, second uniaxial magnetic quantity sensor and the third list
For shielding the shield of external magnetic field outside axial magnetic sensor region.
10. according to claim 1 into electric system described in 9 any one line current measuring device, which is characterized in that
The display device is specially LED touch display screen.
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| CN201821590662.9U CN208888302U (en) | 2018-09-28 | 2018-09-28 | The measuring device of line current in a kind of electric system |
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| CN201821590662.9U CN208888302U (en) | 2018-09-28 | 2018-09-28 | The measuring device of line current in a kind of electric system |
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| CN208888302U true CN208888302U (en) | 2019-05-21 |
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| CN110412339A (en) * | 2019-08-08 | 2019-11-05 | 南方电网科学研究院有限责任公司 | A kind of electric system current measuring device and method |
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| CN110412339A (en) * | 2019-08-08 | 2019-11-05 | 南方电网科学研究院有限责任公司 | A kind of electric system current measuring device and method |
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