CN109521265A - A kind of digital electric mutual inductor of voltage and current combination - Google Patents
A kind of digital electric mutual inductor of voltage and current combination Download PDFInfo
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- CN109521265A CN109521265A CN201910008989.3A CN201910008989A CN109521265A CN 109521265 A CN109521265 A CN 109521265A CN 201910008989 A CN201910008989 A CN 201910008989A CN 109521265 A CN109521265 A CN 109521265A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The embodiment of the present invention discloses a kind of digital electric mutual inductor of voltage and current combination, is related to electric system electric mutual inductor technical field, has the measurement of biggish dynamic and linear measurement section.The voltage and current combines digital electric mutual inductor, comprising: sensor module, signal processing module；The sensor module includes: voltage sensor and current sensor；The voltage sensor is used for, and measures the phase voltage signal of three-phase high-voltage bus respectively, and is exported；The current sensor is used for, and measures the phase current signal on three-phase high-voltage bus respectively, and export；The current sensor includes that three PCB are closed Rogowski coil；The output voltage of the PCB Rogowski coil is directly proportional to the current differential of tested current-carrying conductor；The PCB is closed Rogowski coil specifically: printed conductor is evenly arranged on PCB；The signal processing module is used for, and is handled the phase voltage signal, the phase current signal, is converted to digital signal, and export.
Description
Technical field
The present invention relates to electric system electric mutual inductor technical fields more particularly to a kind of voltage and current to combine digital electric
Sub- mutual inductor.
Background technique
Electric power mutual-inductor is one kind of indispensable high-tension apparatus, for protecting, monitoring and measure.
Electric power mutual-inductor, including voltage transformer and current transformer are that electrical energy measurement and acquisition are carried out in electric system
The safety and economy of the important equipment of mechanical and electrical protection signal, precision and reliability and electric system are closely related.However
Traditional electromagnetic type electric power mutual-inductor is faced with some still unsolved ask into large capacity, super-pressure development process in power grid
Topic, for example, voltage transformer cannot short circuit, current transformer cannot open a way, easily be saturated, have ferromagnetic resonance, volume are big, quality is heavy,
Signal transmission is easily affected interference etc..
One or two times fusion distribution switchgear mainly uses traditional electromagnetic current transducer and iron core type electronics mutual inductance
Device, although can satisfy the needs run at present by longtime running practical proof, as electric network composition is increasingly sophisticated, system
Capacity is continuously increased, and system short-circuit electric current is increasing, and informationization, automatization level are higher and higher, and conventional electromagnetic electric current is mutual
The drawbacks of sensor, is more and more obvious.
By the way of electric resistance partial pressure and capacitance partial pressure, capacitance type potential transformer is held existing electronic type voltage transformer
It is limited by the level of lightning impulse by capacitor pressure resistance rated value, it is impossible to will not be damaged when guaranteeing by random lightning impulse
It is bad；In contrast, resistive voltage sensor bear lightning impulse ability specific capacitance formula it is strong very much.But it is a large amount of using electricity
Resistive voltage sensor will cause the decline of distribution line resistance over the ground, bring to the insulation resistance of detection line-to-ground
It is difficult.
There are magnetic saturation phenomenons for traditional electromagnetic current transducer, when short circuit occurs for system in operation, mutual inductor iron
Core will retain remanent magnetism, and core sataration is serious, make transformer transient penalty, not can correctly reflect primary current, cause to protect
Tripping or malfunction；Frequency response range is narrow, poor linearity；Weak signal transmission is simulated, anti-interference ability is weak；Range of dynamic measurement
It is narrow, it is difficult to realize large-range measuring；Volume is big, heavier-weight, and own loss is big；Two are needed with one or two fusion calculation machine systems
Secondary conversion, there are matching problems；Secondary winding open circuit can generate high pressure, cause equipment or personal injury.The low function of iron core line ring type
A kind of improvement of the electronic current transducer as conventional electromagnetic current transformer is consumed, the saturated characteristic of iron core is improved, is expanded
Measurement range, but the intrinsic problem for the intimate mutual inductor such as also there is magnetic saturation.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of voltage and current combination digital electric mutual inductor, compared to traditional
Ferromagnetic resonance phenomenon is not present without saturation problem in electromagnetic potential and current transformer, thus has the measurement of biggish dynamic
With linear measurement section.
The present invention provides a kind of voltage and current combination digital electric mutual inductor, comprising: sensor module, signal processing mould
Block；
The sensor module includes: voltage sensor and current sensor；
The voltage sensor is used for, and measures the phase voltage signal of three-phase high-voltage bus respectively, and is exported；
The current sensor is used for, and measures the phase current signal on three-phase high-voltage bus respectively, and export；The electric current
Sensor includes that three PCB are closed Rogowski coil；The electric current of the output voltage and tested current-carrying conductor of the PCB Rogowski coil is micro-
It is divided into direct ratio；The PCB is closed Rogowski coil specifically: printed conductor is evenly arranged on PCB；
The signal processing module is used for, and is handled the phase voltage signal, the phase current signal, is converted to number
Word signal, and export.
The electric mutual inductor, further includes:
Electric mutual inductor shell, for being provided the structural support for the sensor module and the signal processing module, institute
It states electric mutual inductor shell to be made of high voltage insulating materials, is provided with external signaling interface.
The signal processing module include: voltage signal conditioning circuit, current signal conditioning circuit, analog to digital conversion circuit,
Microcontroller circuit and isolated RS485 data communication interface；
The voltage signal conditioning circuit is used for, and the phase voltage signal, which is adjusted to analog-digital conversion circuit as described, can measure
In range；
The current signal conditioning circuit is used for, and the phase current signal, which is adjusted to analog-digital conversion circuit as described, can measure
In range；
Analog-digital conversion circuit as described is used for, and the phase voltage signal adjusted and the phase current signal are converted to electricity
Current voltage digital signal；
The microcontroller circuit is used for, and the voltage and current digital signal is led to by the isolated RS485 data
Believe interface output；
The isolated RS485 data communication interface is used for, and the voltage and current digital signal is exported.
The current regulating circuit includes:
Amplifying circuit, for being amplified to the phase current differential signal；
The phase current differential signal of amplification is converted to the corresponding voltage signal of tested electric current object by integrating circuit；
Voltage follower circuit, for the signal after integral to be isolated.
The sensor module specifically: in merging on-pole switch, high voltage bus is passed through out of described on-pole switch, three-phase
Carrying object penetrates the sensor module simultaneously.
The voltage sensor includes: high-voltage thick-film resistance R, higfh-tension ceramics capacitor C, isolated form current transformer T；
The first end of the higfh-tension ceramics capacitor C is connect with the high voltage bus, the second end of the higfh-tension ceramics capacitor C
It is connect with the first end of the high-voltage thick-film resistance R, the second end of the high-voltage thick-film resistance R connects isolated form current transformer
The first input end of T；The second input end grounding of the isolated form current transformer T, the isolated form current transformer T output
The current signal proportional to voltage.
3 PCB closure Rogowski coils are respectively arranged on same pcb board, and the PCB uses four laminate technique systems
Make, the top and the bottom of the PCB applies copper as shielding respectively, and two layers of the centre of the PCB is closed sieve as the PCB
The wiring layer of family name's coil.
The PCB is closed Rogowski coil specifically: each Rogowski coil includes inlet wire, outlet, upper coiling, lower coiling and returns
Loop line, two layers of parallel cabling between the inlet wire and the outlet in the pcb, upper coiling and the lower coiling described in each group pass through
The through-hole of two interlayers connects, and is connected between adjacent coiling group by oblique cutting lead, in whole coiling groups around current-carrying conductor center one
Week the outlet is then returned to around the whole circle of wire turn one by the line of return, completes a complete phase current Rogowski coil.
In above-described embodiment, current sensor is used as using PCB closure Rogowski coil, compared to traditional electromagnetic potential with
Ferromagnetic resonance phenomenon is not present without saturation problem in current transformer, thus has the measurement of biggish dynamic and linear measurement area
Between.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the connection schematic diagram of digital electronic mutual inductor provided by the invention；
Fig. 2 is digital electronic mutual inductor general structure schematic diagram provided by the invention；
Fig. 3 is the sensor module structure block diagram of electric mutual inductor provided by the invention；
Fig. 4 is voltage sensor schematic illustration provided by the invention；
Fig. 5 is phase current PCB Rogowski coil embodiment provided by the invention；
Fig. 6 is phase current PCB Rogowski coil coiling local detail schematic diagram provided by the invention；
Fig. 7 is signal processing module structural block diagram provided by the invention；
Fig. 8 is embodiment of the voltage sensor provided by the invention in shell structure installation；
Fig. 9 is embodiment of the current sensor provided by the invention in shell structure installation.
Specific embodiment
The embodiment of the present invention is described in detail with reference to the accompanying drawing.
It will be appreciated that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
Its embodiment, shall fall within the protection scope of the present invention.
Fig. 1 is the connection schematic diagram of digital electronic mutual inductor provided by the invention；Fig. 2 is provided by the invention digital
Electric mutual inductor general structure schematic diagram；Fig. 3 is the sensor module structure block diagram of electric mutual inductor provided by the invention；Fig. 4
For voltage sensor schematic illustration provided by the invention；Fig. 5 is phase current PCB Rogowski coil embodiment provided by the invention；
Fig. 6 is phase current PCB Rogowski coil coiling local detail schematic diagram provided by the invention；Fig. 7 is at signal provided by the invention
Manage modular structure block diagram；Fig. 8 is embodiment of the voltage sensor provided by the invention in shell structure installation；Fig. 9 is this hair
Embodiment of the current sensor of bright offer in shell structure installation.It is described below in conjunction with each figure.
As shown in Figure 1, providing a kind of voltage and current combination digital electric mutual inductor for the present invention, comprising: sensor die
Block 11, signal processing module 12；
The sensor module 11 specifically: in merging on-pole switch, high voltage bus is passed through out of described on-pole switch, and three
Phase carrying object penetrates the sensor module simultaneously.
The sensor module 11 includes: voltage sensor 111 and current sensor 112；
The voltage sensor is used for 111, measures the phase voltage signal of three-phase high-voltage bus respectively, and exports；The electricity
Pressure sensor 111 includes: high-voltage thick-film resistance R 1111, higfh-tension ceramics capacitor C 1112, isolated form current transformer T1113；
The first end of the higfh-tension ceramics capacitor C is connect with the high voltage bus, the second end of the higfh-tension ceramics capacitor C and the height
The first end connection of thick-film resistor R is pressed, the second end of the high-voltage thick-film resistance R connects the first of isolated form current transformer T
Input terminal；The second input end grounding of the isolated form current transformer T, the isolated form current transformer T output and voltage
Proportional current signal.
The current sensor 112 is used for, and measures the phase current signal on three-phase high-voltage bus respectively, and export；It is described
Current sensor includes that three PCB are closed Rogowski coil；The output voltage of the PCB Rogowski coil and the electricity of tested current-carrying conductor
It is directly proportional to flow differential；The PCB is closed Rogowski coil specifically: printed conductor is evenly arranged on PCB；3 PCB are closed
It closes Rogowski coil to be respectively arranged on same pcb board, the PCB is using the production of four laminate techniques, the top of the PCB and most
Bottom applies copper as shielding respectively, and two layers of the centre of the PCB is closed the wiring layer of Rogowski coil as the PCB.The PCB
Be closed Rogowski coil specifically: each Rogowski coil include inlet wire, outlet, upper coiling, lower coiling and the line of return, the inlet wire and
Two layers of parallel cabling between the outlet in the pcb, upper coiling and the lower coiling described in each group are connected by the through-hole of two interlayers
It connects, is connected between adjacent coiling group by oblique cutting lead, in whole coiling groups around current-carrying conductor center one week, then pass through return
Line returns to the outlet around the whole circle of wire turn one, completes a complete phase current Rogowski coil.
The signal processing module 12 is used for, and is handled the phase voltage signal, the phase current signal, is converted to
Digital signal, and export.
The electric mutual inductor, further includes:
Electric mutual inductor shell 13, for being provided the structural support for the sensor module and the signal processing module,
The electric mutual inductor shell is made of high voltage insulating materials, is provided with external signaling interface.
The signal processing module 12 includes: voltage signal conditioning circuit 121, current signal conditioning circuit 122, modulus turn
Change circuit 123, microcontroller circuit 124 and isolated RS485 data communication interface 125；
The voltage signal conditioning circuit 121 is used for, and the phase voltage signal is adjusted to analog-digital conversion circuit as described can
In measurement range；
The current signal conditioning circuit 122 is used for, and the phase current signal is adjusted to analog-digital conversion circuit as described can
In measurement range；The current regulating circuit 122 includes: amplifying circuit 1221, for carrying out to the phase current differential signal
Amplification；The phase current differential signal of amplification is converted to the corresponding voltage signal of tested electric current object by integrating circuit 1222；
Voltage follower circuit 1223 plays stable buffer function for the signal after integral to be isolated.
Analog-digital conversion circuit as described 123 is used for, and the phase voltage signal adjusted and the phase current signal are converted
For voltage and current digital signal；
The microcontroller circuit 124 is used for, and the voltage and current digital signal is passed through the isolated RS485 data
Communications interface transmission is to output；
The isolated RS485 data communication interface 125 is used for, and the voltage and current digital signal is exported.
In above-described embodiment, using high-voltage thick-film resistance and higfh-tension ceramics capacitor as voltage sensor, it is closed using PCB
Iron is not present without saturation problem as current sensor, compared to traditional electromagnetic potential and current transformer in Rogowski coil
Magnetic resonance phenomenon, thus there is the measurement of biggish dynamic and linear measurement section.
The invention has the following advantages:
1) traditional electromagnetic potential and current transformer are compared, without saturation problem, ferromagnetic resonance phenomenon is not present, because
And there is the measurement of biggish dynamic and linear measurement section；
2) it only acquires signal from power grid, hardly picks up energy, and can match well with Microcomputer Protection, monitoring control
It closes.
3) present invention have it is small in size, light-weight, integrated level is high, transmission frequency bandwidth, resonance free, data transfer signal will not
The advantages that being affected interference can satisfy the requirement of measurement and protection.
4) present invention provides a kind of digital electronic mutual inductor for 10kV on-pole switch, which is made pottery based on high pressure
The principle of porcelain capacitor thick-film resistor partial pressure measurement voltage and Rogowski coil measurement electric current, combines voltage, current sensor and integrates,
And it is exported by signal condition digital sample.The mutual inductor overcomes the shortcomings that conventional electric power mutual inductor, has small in size, precision
Height, bandwidth, without magnetic saturation phenomenon the features such as, integrate measurement and protection function, and reserved the communication with host computer
Interface can merge with one or two emerging system data depths, upload the state of power grid.
Specific embodiment of the invention is described below.
The present invention provide it is a kind of (such as: 10kV) voltage and current combines digital electric mutual inductor, can be applied to one or two
It is secondary fusion distribution switchgear digital electronic mutual inductor, and in particular to digital electronic mutual inductor sensor constitute,
Circuit composition and surface structure part.
The novel digital type electric mutual inductor that the present invention is developed connects the one of 10kV resistive-capacitive voltage divider in switch-side on the spot
Current signal based on secondary voltage signal and Rogowski coil, high-tension resistive, high-voltage capacitance, Rogowski coil cast solid, transformation
After sampling, rear end controller switching equipment is sent to downwards with stream socket.
The present invention uses the main sensors of novel RC divider and Rogowski coil as mutual inductor, respectively according to phase
Voltage, current phasor measurement object are started with, and are improved and optimizated to the form of resistive-capacitive voltage divider and PCB Rogowski coil.According to the defeated of sensor
Signal is improved by integrator, amplifier etc. out, and is communicated by microprocessor by isolated RS485 through analog-digital converter
Interface output digit signals.
Digital electronic mutual inductor provided by the invention, including sensor module, signal processing module, electric mutual inductor shell
Body three parts.
The sensor module, is made of voltage sensor and current sensor.Wherein voltage sensor is for measuring
5.7kV and higher phase voltage, are connected in series by higfh-tension ceramics capacitor and thick-film resistor, and defeated by low current isolation transformer
The current signal proportional to voltage out；Current transformer is mainly used for measuring phase current, is made of PCB Rogowski coil, exports
Voltage is directly proportional to the current differential of tested current-carrying conductor, that is, output voltage signal is able to reflect exchange in tested baffle
The size of electric current.
In the signal processing module, signal is inputted mainly by the three road phase voltage signals and three from sensor module
Road phase current signal.The signal processing module mainly includes microprocessor circuit, voltage signal conditioning circuit, current signal conditioning
The composition such as circuit, analog to digital conversion circuit and isolation RS 485 datel circuit.The signal processing module passes through to voltage, electric current
The processing of signal is ultimately converted to digital signal and is sent to one or two emerging system computers.Digital signal has stronger anti-
Outside electromagnetic interference characteristic directly provides data, ontology and on-pole switch depth integration for monitoring power distribution protective device, becomes one
Body.
The electric mutual inductor shell is that sensor module and signal processing module provide the structural support, and have certain
High-voltage isulation performance, there are external signaling interfaces.
Digital electronic mutual inductor provided by the invention, measuring system is highly integrated, takes novel sensor collection voltages
Current signal is different from conventional electromagnetic electric mutual inductor, and various hidden danger existing for technology before overcoming, and can adapt to work as
The growth requirement of the extra-high voltage of preceding fast development, bulk power system.
Fig. 2 is the overall construction drawing of 10kV digital voltage currents combination electric mutual inductor provided by the invention, the electronics
Mutual inductor may replace the position of conventional electromagnetic mutual inductor (CT), be placed in on-pole switch, 10kV high voltage bus is worn out of switch
It crosses, three-phase carrying object penetrates sensor module simultaneously.Wherein voltage sensor passes through resistance-capacitance circuit and small current mutual inductor will
5.7kV phase voltage is converted into low current signal corresponding with voltage, is output to the voltage conditioning circuit of signal processing module；Electric current
Sensor samples the current signal on high voltage bus by novel PCB Rogowski coil, is output to the electric current of signal processing module
Conditioning circuit.In signal processing module, the current signal and voltage signal that sensor module measures pass through respective signal tune
The regulation of electrical circuit is managed to the acceptable measurement range of analog-digital converter, digital signal is converted to through analog to digital conversion circuit, passes through isolation
Current Voltage digital signal is sent to the FTU of one or two fusion devices by RS485 datel circuit, realizes 10kV medium-voltage line
The measurement and protection of state.
Fig. 3 show composite structural diagram inside sensor module, wherein including voltage sensor and current sensor.
Fig. 4 is the voltage sensor schematic diagram in sensor module provided by the invention.In figure, C represents higfh-tension ceramics electricity
Hold；R represents high-voltage thick-film resistance；T represents isolated form high precision current transformer.
More existing capacitance type mutual inductor and voltage-type are mutual for the technology path of voltage transformer provided by the invention
Sensor has apparent advantage.The present invention provides high-tension resistive and the concatenated mode of high-voltage capacitance: random lightning impulse voltage by
High-tension resistive is born, and improves the resistance to lightning impulse ability of voltage transformer provided by the invention；The direct current of insulation against ground resistance is exhausted
It (is to be applied to route using megger come measuring circuit insulation against ground resistance mostly at present that edge, which detects voltage by high-voltage capacitance receiving,
On be DC voltage), to avoid product of the present invention insulation against ground detection is potential from influencing.Realize voltage provided by the invention
The technology path of mutual inductor, it is critically important to the selection of high-voltage capacitance and high-tension resistive.The present invention claims selected higfh-tension ceramics capacitors
With high-tension resistive consistency, temperature drift value and in terms of have good performance.
The phase voltage of the specified 5.7kV of primary side of voltage sensor measurement provided by the invention, greatest measurement are specified
The 200% of value.Secondary side signal is sampled after being handled by voltage conditioning circuit by analog to digital conversion circuit.From device security and surely
Qualitative angle considers, be isolated to a secondary side of pressure phase voltage mutual inductor in the specification critically important.The present invention provides 2mA/
A secondary side voltage is isolated in 2mA high precision current transformer, avoids secondary side apparatus by brought by primary side failure
Damaging influence.
Phase current sensor carries out current sample using Rogowski coil.Roche (Rogowski) coil be by conducting wire equably
It is wrapped in the coil formed on the frame of the non-magnetic material of sectional uniform.Compared to more traditional electromagnetic current transducer, sieve
Family name's coil has the characteristics that light-weight, bandwidth, the linearity are good and without magnetic saturation phenomenon, have been widely used in current measuring device
In, but be not applied to also in the unified secondary fusion device of power train at present, it needs further to adapt to using novel Rogowski coil
One or two fusion devices.When using closure Rogowski coil measurement electric current, need that current-carrying conductor is first passed through closure Rogowski coil
Center, when alternating current to be measured flows through current-carrying conductor, alternating current to be measured can generate alternating magnetic field, magnetic around current-carrying conductor
The line of force is approximately the magnetic of generation in the volume that closure Rogowski coil Circular Winding is surrounded using current-carrying conductor center as the circle in the center of circle
Logical variation can be closed Rogowski coil and be converted into the voltage signal proportional to each wire turn total magnetic flux differential, and the later period can
The voltage signal proportional to alternating current is obtained by integrating amplification circuit.
Traditional Wound-rotor type is closed Rogowski coil, and coiling is usually to have artificial or coil winding machine to complete, and is difficult to accomplish coil
Uniform coiling, every circle coil section are equal, and have the shortcomings that easily broken string and layer capacitance increase error, in the industrial production
Parameter consistency hardly results in guarantee, thus characteristic when influencing Rogowski coil measurement electric current.In order to overcome traditional type to be closed sieve
The shortcomings that family name's coil, is closed Rogowski coil using novel made of PCB, and abbreviation PCB is closed Rogowski coil, by printed conductor
It is evenly arranged on PCB.When measuring electric current, Circular Winding in addition to pick up to alternating current to be measured generate changes of magnetic field it
Outside, it can also pick up to other alternations in space and interfere magnetic field.
Phase current sensor measurement object provided by the invention is the alternating current of 30A~600A of on-pole switch, three-phase
It 120 degree of ac phase difference, needs to measure the alternating current of three-phase simultaneously, is provided simultaneously with anti-external magnetic field interference function, design
It realizes as shown in Figure 5.3 Rogowski coils are simutaneously arranged on 1 piece of pcb board, are not associated between each other.It is anti-outer in order to meet
Boundary's magnetic field requirements, entire PCB is using 4 layers of 3mm plate technique production, and wherein top and the bottom apply larger areas of copper as screen respectively
It covers, intermediate 2 layers of wiring layer as Rogowski coil, so as to shield the extraneous interference of electromagnetic field.
As shown in fig. 6, the coil partial view of anti-external magnetic field interference, each Rogowski coil include inlet wire, outlet, on around
Line, lower coiling and the line of return form, 2 layers of parallel cabling between inlet wire and outlet in the pcb, and coiling and lower coiling pass through on each group
The through-hole of 2 interlayers connects, and is connected between adjacent coiling group by oblique cutting lead, in whole coiling groups around current-carrying conductor center one
Week outlet is then returned to around the whole circle of wire turn one by the line of return, completes a complete phase current Rogowski coil.
Fig. 7 is signal processing module provided by the invention.The function of the module is the number for acquiring the sensor module
According to progress analog-to-digital conversion process, and current and voltage signals are sent to receiving end (such as FTU equipment) by microcontroller.The module
Signal source be sensor module output, S1 represents two end signals of CT+ and CT- in voltage sensor schematic circuit Fig. 3,
Include A, B, C three-phase voltage signal；S2 represents Rogowski coil phase current output signal, includes A, B, C three-phase current signal.
Voltage conditioning circuit (i.e. IV conversion circuit) provided by the invention, as shown in Figure 6.As described above, the input of Fig. 7 is believed
Number S1 is connected with Fig. 3 output signal, regards the high-precision small current mutual inductor in Fig. 3 as constant-current source, voltage conditioning circuit can
Using the series connection suitable high precision sampling resistance R of one resistance value, Lai Shixian IV conversion, then the voltage signal after conversion is transmitted to down
Level-one analog to digital conversion circuit.
Current regulating circuit provided by the invention.Phase current signal on S2 is respectively by amplification, integral and voltage follow
Processing.Signal amplification is that adjustment Rogowski coil is output signals in the sample range of analog to digital conversion circuit.Rogowski coil output
It is the micro voltage signal to tested electric current, so micro voltage signal need to be converted to suitable voltage letter in signal condition process
Number, and it is integrated, restore real current information.For improve sampled signal stability, by voltage follower circuit to integral
Signal afterwards is isolated, and buffer function is played.
The output signal of sensor module is believed simulation by analog to digital conversion circuit after voltage/current conditioning circuit
Number digital signal is converted to, wherein main components are AD conversion chips.Digital electronic mutual inductor proposed by the invention exists
Reach 0.2P grades in accuracy class, therefore is extremely difficult to standard requirements in precision with the AD conversion that microcontroller integrates.
Electric mutual inductor of the present invention selects ampling channel number to be no less than 11 tunnels, sample frequency not less than 1MHz and high resolution (>=16
Position) modulus conversion chip voltage and current signal is sampled, and by sampled result by issuing microcontroller.Microcontroller
After receiving the data, to initial data by correction parameter calculate (correction parameter demarcated by test equipment after be stored in it is non-volatile
In memory), it is externally exported by isolated RS485 communication interface, to serve its in one or two fusion device systems
His equipment.
Shell mechanism voltage sensor side layout according to voltage sensor in Fig. 4 as shown in figure 8, survey in the embodiment of the present invention
Measure principle, wherein phase voltage sensor instance layout as shown in figure 8, first from high voltage bus lead to high-voltage capacitor high pressure
End, then high-voltage resistor high-voltage end is introduced by the low-pressure end of capacitor, then isolation circuit is introduced by the low-pressure end of high-voltage resistor
Current transformer primary side on plate accesses ground wire, forms high-tension measurement circuit, then export corresponding electricity by current transformer pair side
Signal is flowed, the corresponding input of signal processing module is output to.The sensor of three-phase voltage is laid out in the embodiment of the present invention
The side of shell measures the high voltage bus voltage of A, B, C phase respectively.
Shell mechanism current sensor side layout is as shown in Figure 9 in the embodiment of the present invention.Current sensor is PCB Roche line
Circle, specific embodiment are laid out in the other side of voltage sensor, three-phase high-voltage bus is respectively from the three of structural body referring to Fig. 5
A hole center passes through, and is directly inputted by three-phase current signal is sent to the corresponding of signal processing module to interface.
As one or two fusion paces of national grid power distribution network promote, electromagnetic transformer technology originally increasingly cannot
Adapt to the requirement of power distribution network management.More and more people recognize that the field of power distribution in future should be using electric mutual inductor
Trend of the times.
The present invention relates to electric mutual inductor compare more original electromagnetic-type electronic mutual inductor, mainly have following side
The characteristics of face:
(1) the present invention relates to electric mutual inductor be free of iron core, the problems such as eliminating magnetic saturation and ferromagnetic resonance.
(2) dynamic range is big, and measurement accuracy is high, and frequency response range is wide.The need of measurement and relay protection can be met simultaneously
It wants.
(3) first and second sides are electrically completely isolated, and Keep Clear-High Voltage without open circuit for low-pressure side, highly-safe, have excellent insulation
Performance.
(4) data transmit strong antijamming capability.Due to using measurement data locally nearest digitizing function, relative to electromagnetism
Formula electric mutual inductor, the interference performance that does in data transmission procedure greatly increase.
(5) small in size, light weight and cost is low.The electromagnetic-type electronic mutual inductor of the more identical voltage class of its weight is much smaller,
Structure is simple, and cost is lower, may be implemented and the various forms of depth integrations of power distribution network.
(6) electric mutual inductor is composed in series high-voltage arm using high-tension resistive and high-voltage capacitance, by sampling primary side high pressure,
Form corresponding with high pressure low current, and be isolated by current transformer and sampled, be different from existing electric resistance partial pressure with
Capacitance-voltage-distributing type electronic voltage mutual induction device.
(7) electric mutual inductor carries out the acquisition of phase current using PCB Rogowski coil, and three-phase current sampling is integrated in one
It is using the deposited copper of top layer and bottom electromagnetic-field-shielded to the wire winding layer progress of intermediate 2 layers of Rogowski coil on block pcb board, it takes
The heavy further shield perimeter electromagnetic field of process of tin of the line of return and pcb board edge is arranged to every phase Rogowski coil coiling group.
(8) the voltage conditioning circuit in signal processing module takes IV transformation by the three collected voltages of road voltage sensor
Signal (electric current) is converted to voltage signal corresponding with measured voltage object, and improves to analog-digital converter and can survey by amplifier
The range of amount.
(9) the collected phase current signal of Rogowski coil is differentiated voltage signal corresponding with tested curent change, signal
The signal is passed through amplifying circuit for signal condition to the measurable model of digital analog converter by the current regulating circuit in processing module
It encloses, then is converted to by integrator to the corresponding voltage signal of tested electric current object, subsequent voltage follows circuit to delay the signal
Punching isolation, can be sampled by analog to digital conversion circuit.
(10) microprocessor in signal processing circuit is converted three-phase voltage and three-phase current by analog-to-digital conversion module
For digital signal, digital signal is sent to on-pole switch computer system using RS485 serial port insulating circuit, is different from tradition
The analog signal transmission of electromagnetic-type electronic mutual inductor has more reliably signal transduction pathway and signal integrity.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by those familiar with the art, all answers
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (8)
1. a kind of voltage and current combines digital electric mutual inductor characterized by comprising sensor module, signal processing mould
Block；
The sensor module includes: voltage sensor and current sensor；
The voltage sensor is used for, and measures the phase voltage signal of three-phase high-voltage bus respectively, and is exported；
The current sensor is used for, and measures the phase current signal on three-phase high-voltage bus respectively, and export；The current sense
Device includes that three PCB are closed Rogowski coil；The current differential of the output voltage of the PCB Rogowski coil and tested current-carrying conductor at
Direct ratio；The PCB is closed Rogowski coil specifically: printed conductor is evenly arranged on PCB；
The signal processing module is used for, and is handled the phase voltage signal, the phase current signal, is converted to digital letter
Number, and export.
2. electric mutual inductor according to claim 1, which is characterized in that further include:
Electric mutual inductor shell, for being provided the structural support for the sensor module and the signal processing module, the electricity
Sub- transformer housing is made of high voltage insulating materials, is provided with external signaling interface.
3. electric mutual inductor according to claim 1, which is characterized in that the signal processing module includes: voltage signal
Conditioning circuit, current signal conditioning circuit, analog to digital conversion circuit, microcontroller circuit and isolated RS485 data communication connect
Mouthful；
The voltage signal conditioning circuit is used for, and the phase voltage signal is adjusted to analog-digital conversion circuit as described measurable range
It is interior；
The current signal conditioning circuit is used for, and the phase current signal is adjusted to analog-digital conversion circuit as described measurable range
It is interior；
Analog-digital conversion circuit as described is used for, and the phase voltage signal adjusted and the phase current signal are converted to voltage electricity
Streaming digital signal；
The microcontroller circuit is used for, and the voltage and current digital signal is connect by the isolated RS485 data communication
Mouth output；
The isolated RS485 data communication interface is used for, and the Current Voltage digital signal is exported.
4. electric mutual inductor according to claim 3, which is characterized in that the current regulating circuit includes:
Amplifying circuit, for being amplified to the phase current differential signal；
The phase current differential signal of amplification is converted to the corresponding voltage signal of tested electric current object by integrating circuit；
Voltage follower circuit, for the signal after integral to be isolated.
5. electric mutual inductor according to claim 1, which is characterized in that the sensor module specifically: on merging column
In switch, high voltage bus is passed through out of described on-pole switch, and three-phase carrying object penetrates the sensor module simultaneously.
6. electric mutual inductor according to claim 1, which is characterized in that the voltage sensor includes: high-voltage thick-film electricity
Hinder R, higfh-tension ceramics capacitor C, isolated form current transformer T；
The first end of the higfh-tension ceramics capacitor C is connect with the high voltage bus, the second end of the higfh-tension ceramics capacitor C and institute
The first end connection of high-voltage thick-film resistance R is stated, the second end connection isolated form current transformer T's of the high-voltage thick-film resistance R
First input end；The second input end grounding of the isolated form current transformer T, isolated form current transformer T output with
The proportional current signal of voltage.
7. electric mutual inductor according to claim 1, which is characterized in that 3 PCB closure Rogowski coils are respectively arranged
In on same pcb board, the PCB is made of four laminate techniques, and the top and the bottom of the PCB applies copper as screen respectively
It covers, the wiring layer of two layers of the centre of the PCB as PCB closure Rogowski coil.
8. electric mutual inductor according to claim 7, which is characterized in that
The PCB is closed Rogowski coil specifically: each Rogowski coil includes inlet wire, outlet, upper coiling, lower coiling and return
Line, two layers of parallel cabling between the inlet wire and the outlet in the pcb, upper coiling and the lower coiling described in each group pass through two
The through-hole of interlayer connects, and is connected between adjacent coiling group by oblique cutting lead, in whole coiling groups around current-carrying conductor center one week,
Then the outlet is returned to around the whole circle of wire turn one by the line of return, completes a complete phase current Rogowski coil.
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| CN110542789A (en) * | 2019-09-26 | 2019-12-06 | 国网重庆市电力公司电力科学研究院 | Optical fiber current sensor and acquisition device |
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| CN112578261A (en) * | 2019-09-29 | 2021-03-30 | 北京交通大学 | Square PCB Rogowski coil |
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| CN114325060A (en) * | 2022-01-11 | 2022-04-12 | 平高集团智能电力科技有限公司 | Current sensor system |
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