CN105717403B - Cell array insulation fault monitors system - Google Patents
Cell array insulation fault monitors system Download PDFInfo
- Publication number
- CN105717403B CN105717403B CN201410729791.1A CN201410729791A CN105717403B CN 105717403 B CN105717403 B CN 105717403B CN 201410729791 A CN201410729791 A CN 201410729791A CN 105717403 B CN105717403 B CN 105717403B
- Authority
- CN
- China
- Prior art keywords
- leakage current
- signal processing
- winding
- cell array
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000009413 insulation Methods 0.000 title claims abstract description 25
- 238000012545 processing Methods 0.000 claims abstract description 63
- 238000001514 detection method Methods 0.000 claims abstract description 48
- 238000012544 monitoring process Methods 0.000 claims abstract description 21
- 230000003287 optical effect Effects 0.000 claims abstract description 9
- 239000000835 fiber Substances 0.000 claims abstract description 5
- 238000004804 winding Methods 0.000 claims description 68
- 238000006243 chemical reaction Methods 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 230000005611 electricity Effects 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 8
- 238000004080 punching Methods 0.000 claims description 7
- 238000004088 simulation Methods 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 20
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 230000003321 amplification Effects 0.000 description 8
- 238000003199 nucleic acid amplification method Methods 0.000 description 8
- 239000013307 optical fiber Substances 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 229910052732 germanium Inorganic materials 0.000 description 2
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention provides a kind of cell array insulation faults to monitor system, and for monitoring cell array earth leakage current, monitoring system includes：Detection unit, signal processing unit and power supply unit.Detection unit is for measuring leakage current and generating a detection signal；Signal processing unit receives detection signal, and carries out signal processing to detection signal, and signal processing unit includes an electrooptic switching element, and monitoring room is transmitted through the fiber to after the detection signal after signal processing is converted to optical signal；Power supply unit inputs leakage current, exports DC voltage and powers to signal processing unit.The present invention can realize the accurate measurement of leakage current, to improve the measurement accuracy of leakage current, can ensure that the leakage current signal measured, not by electromagnetic interference, improves the precision of transmission in transmission process.
Description
Technical field
The present invention relates to fault monitoring system, more particularly to a kind of cell array insulation fault monitors system.
Background technology
The capacity and electricity of single battery are all relatively low, therefore, are generally concatenated and and are unified into certain electricity single battery
Pressure and electric current battery pack (or cell array) after used, still, it is this single battery is concatenated, parallel combination
Battery pack afterwards is susceptible to branch leakage current on the branch road of each cell array.
In cell array insulation fault monitoring system, generally use measures the leakage current of battery pack branch over the ground and comes in fact
It is existing.Since battery pack branch earth leakage current is faint DC current, to such electric current, traditional measurement method is to use
Hall current sensor.But Hall current sensor has that measurement accuracy is low when measuring weak current.Due to
The usual very little of leakage current amplitude in practice, generally in milliampere grade hereinafter, even arriving microampere order.In this case, conventional
Hall current sensor even cannot be satisfied actual measurement demand.
In cell array insulation fault monitoring process, the faint leakage current signal that will be measured is needed, is transmitted to event
Barrier detection integrated treatment unit.In the prior art, it is to be measured let out for the processing mode of collected Leakage Current signal routine
Leakage current is transmitted after over sampling by cable copper wire, since Leakage Current signal is fainter, is transmitted using copper conductor
The mode of leakage current signal is easily by electromagnetic interference, to which the measurement to leakage current brings prodigious error and data distortion.
Meanwhile when to each cell array branch leakage current measurement, need to carry for the signal processing circuit of leakage current
Power supply source.For the power supply needed for signal processing circuit, China is typically by the way of centralized function, if using outer at present
The mode of portion's central energy supply, when cell array number of branches to be measured is numerous, it is necessary to be laid with a large amount of metallic cables, this will lead
Cause site operation amount very huge.
Invention content
Battery pack insulation fault provided by the invention monitors system, the accurate measurement of leakage current can be realized, to carry
The high measurement accuracy of leakage current.
The technical scheme is that a kind of cell array insulation fault monitoring system is provided, for monitoring cell array pair
Ground leakage current, wherein monitoring system includes：Detection unit, signal processing unit and power supply unit.Detection unit is for measuring
Leakage current, and generate a detection signal；Signal processing unit receives detection signal, and carries out signal processing to detection signal,
The signal processing unit includes an electrooptic switching element, passes through light after the detection signal after signal processing is converted to optical signal
Fibre is transmitted to monitoring room；Power supply unit inputs leakage current, is converted to it, exports DC voltage and is supplied to signal processing unit
Electricity.
In one embodiment of the invention, detection unit includes three winding core sensor and operational amplifier.Three winding iron core
Sensor is a punching structure, and the input quantity of armature winding is leakage current；The primary side packet of three winding core sensor
It includes and measures winding and balance winding, the first end output for measuring winding measures electric current, and the second end for measuring winding is connected to operation
Amplifier out and the second end for balancing winding balance the inverting input of the first end connection operational amplifier of winding, put down
The second end of weighing apparatus winding is connected to operational amplifier output terminal and measures the second end of winding, the in-phase input end of operational amplifier
It is connected with operational amplifier output terminal.
In one embodiment of the invention, three winding core sensor further includes a leakage impedance, a regulation resistance；Leakage impedance connects
Between the second end for measuring winding and the second end of balance winding；Regulation resistance is connected to operational amplifier output terminal and balance
Between the second end of winding.
In one embodiment of the invention, signal processing unit further includes：Analog-digital converter, digital signal processor.Mould
The leakage current that detection unit measures is changed into digital signal by quasi- digital quantizer；Digital signal processor connects simulation numeral
Converter, for converting digital signals into serial digital signal；Wherein, electrooptic switching element connects digital signal processor,
For serial digital signal to be converted to optical signal.
In one embodiment of the invention, signal processing unit further includes difference amplifier, is measured for amplification detection unit
The input terminal of leakage current, difference amplifier receives the leakage current that detection unit measures, the output end connection of difference amplifier
To the input terminal of analog-digital converter.
In one embodiment of the invention, signal processing unit further includes frequency overlapped-resistable filter, and frequency overlapped-resistable filter is connected to difference
Divide between amplifier and analog-digital converter.
In one embodiment of the invention, frequency overlapped-resistable filter is second-order low-pass filter.
In one embodiment of the invention, signal processing unit includes multiple difference amplifiers and corresponding with difference amplifier
Frequency overlapped-resistable filter and a multiway analog switch, wherein
The input terminal of each difference amplifier receives the leakage current that the detection unit of each battery branch measures, each difference respectively
The output end of amplifier is connected to the input terminal of each frequency overlapped-resistable filter, and the output end of each frequency overlapped-resistable filter is connected to multichannel mould
Each input terminal of quasi- switch, the output end of multiway analog switch are connected to the input terminal of analog-digital converter.
In one embodiment of the invention, electrooptic switching element includes light emitting diode.
In one embodiment of the invention, power supply unit includes：Transformer, rectification module and power conversion module.
Transformer is a punching structure, and primary side input is leakage current to be measured, for leakage current to be measured is electric
The secondary side of transformer can be transferred to；The input terminal of rectification module is connected to the output end of Circuit Fault on Secondary Transformer, becomes for rectification
The electricity of depressor secondary side output；Power conversion module is connected to the output end of rectification module, for filtering out rectification module output
AC ripple component in electricity.
In one embodiment of the invention, rectification module is a full-bridge circuit.
In one embodiment of the invention, power conversion module is a ∏ shape filter circuits.
In one embodiment of the invention, power circuit further includes a filter capacitor, is parallel to the output end of rectification module, is used for
Filter out the of ac of rectification module output electricity.
Technical solution in summary, the present invention can realize the accurate measurement of leakage current, to carry by detection unit
The high measurement accuracy of leakage current.Detection unit transmitting measured values are turned to signal processing unit by amplification, filtering, A/D
It changes, analog signal is become optical signal and is transmitted through the fiber to monitoring room by Digital Signal Processing and electro-optic conversion, the signal processing
Unit can make guarantee measure leakage current signal in transmission process not by electromagnetic interference, improve the precision of transmission.It utilizes
The electric energy of the ripple component of leakage current is powered for signal processing unit, so as to be the signal processing list of leakage current nearby
Member provides power supply, to save the application of metallic cable, mitigates site operation amount.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill of field, without having to pay creative labor, other are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is the structure chart that one embodiment of the invention cell array insulation fault monitors system；
Fig. 2 is the detection cell circuit figure of one embodiment of the invention；
Fig. 3 is the structure chart of the signal processing unit of one embodiment of the invention；
Fig. 4 is the structure chart of the signal processing unit of another embodiment of the present invention；
Fig. 5 is the power circuit schematic diagram of one embodiment of the invention；
Fig. 6 is the circuit construction of electric power figure of one embodiment of the invention；
Accompanying drawings symbol description：
Ip：Leakage current to be measured；
11：Detection unit；
12：Signal processing unit：
13：Power supply unit；
14：Monitoring room；
111：Three winding core sensor；
112：Operational amplifier；
N1：Armature winding；
N2：Measure winding；
N3：Balance winding；
121：Difference amplifier；
122：Frequency overlapped-resistable filter；
123：A/D converter；
124：Digital signal processing circuit；
125：Electrooptic switching element；
126：Power-supply system；
131：Transformer；
132：Rectification module；
133：Power conversion unit.
Specific implementation mode
In order to which the technical characterstic and effect that make the present invention are more obvious, technical scheme of the present invention is done below in conjunction with the accompanying drawings
It further illustrates, the specific example that the present invention also can have other different is illustrated or implements, any those skilled in the art
The equivalents done within the scope of the claims belong to the protection category of the present invention.It should be noted that attached drawing is only used for
Bright technical scheme of the present invention is not offered as the concrete structure of cell array insulation fault monitoring system components.
As shown in FIG. 1, FIG. 1 is the structure chart that one embodiment of the invention cell array insulation fault monitors system, cell arrays
Row insulation fault monitors system：Detection unit 11, signal processing unit 12 and power supply unit 13.Detection unit 11 is for surveying
Leakage current Ip is measured, and generates a detection signal, signal processing unit 12 receives the detection signal of detection unit 11, and to detection
The detection signal that unit 11 exports carries out signal processing, and by treated, detection signal is transmitted to monitoring room 14 through optical fiber, power supply
Unit 13 converts leakage current Ip, and the output voltage after transformation is powered to signal processing unit 12.
Cell array forms battery pack after in parallel, series connection, and there are two output cables for battery pack tool, respectively represent battery pack
Positive and negative anodes, referring to Fig. 2, Fig. 2 be one embodiment of the invention detection unit circuit diagram.Detection unit includes three winding iron
Core sensor 111 and operational amplifier 112.Three winding core sensor is punching structure, the three winding core sensor
Iron core sleeve be set on battery pack output cable, the sides the armature winding N1 input quantity of three winding core sensor is that leakage to be measured is electric
Flow Ip.The primary side of three winding core sensor 111 includes measuring winding N2 and balance winding N3.In one embodiment of the invention,
As shown in fig.2, detection unit further includes leakage impedance R2 and regulation resistance R3.Regulation resistance R3 can limit operational amplifier
112 imbalance, and can attenuated signal measure when low-frequency disturbance.Leakage impedance R2 be series at the second end 2 for measuring winding N2 and
Between the second end 4 for balancing winding N3, regulation resistance R3 is series at operational amplifier output terminal 7 and balances the second end 4 of winding
Between.The output detection signal of first end 1 of winding is measured, that is, the electric current for flowing through load resistance R1 is the electric current measured.It measures
The second end 2 of winding is connected to one end of leakage impedance R2, and the first end 3 for balancing winding connects the inverting input of operational amplifier
5, the second end 4 for balancing winding is connected to the other end of leakage impedance R2 and one end of regulation resistance R3, operational amplifier 112 it is same
Phase input terminal 6 is connected with the other end of operational amplifier output terminal 7 and regulation resistance R3.Balance winding N3 and operational amplifier
112 realize the compensation to iron core T exciting impedances so that iron core handles Zero flux state in current sensor work process.Balance
The setting of winding N3 is to reduce excitation current, and the closed loop constituted with operational amplifier can be such that iron core is operated in " approximation "
Zero flux state.
Purpose using this compensation way is the contribution for reducing iron core exciting current to measurement error.Increase balance winding
After N3 and operational amplifier 112, iron core exciting current will not be necessary condition that this current sensor works.And it is existing
Compensation method (electromotive force compensation, magnetomotive force compensation) is big to be required for exciting current as necessary operating condition.At this point, utilizing operation
" empty short " " void is disconnected " characteristic of 112 reverse side 5 of amplifier, in-phase end 6, exciting current is reduced so that iron core T locates at work
In " approximation " Zero flux state；At this point, although exciting current very little, can't influence current measurement accuracy.Have in selection
After the operational amplifier for having excellent performance parameter, current measurement accuracy will further improve.
In the embodiment, since three winding core sensor is punching structure, electric leakage current branch to be measured is it
Armature winding.Then, in order not to change leakage current branch structure to be measured, the number of turns of armature winding N1 here can be considered 1 circle.
The number of turns of the number of turns and balance winding N3 for measuring winding N2 can be inconsistent, needs to adjust regulation resistance R3's if inconsistent
Resistance value.The number of turns of the number of turns and balance winding N3 for measuring winding N2 should be larger as possible, can enhance magnetic coupling, reduces iron core leakage
Magnetic；But it is not easy to too greatly, if too big leakage impedance R2 can increase, to lead to that regulation resistance R3 need to be set to negative impedance shape
State.The number of turns of the number of turns for measuring winding N2 and the number of turns of balance winding N3 can be selected according to demand in practice, it is generally the case that
Can be with the number of turns of setting measurement winding N2 for 1000 circles, the number of turns of balance winding N3 is so then easy between 500~1000 circles
Adjust the resistance value of regulation resistance R3.
Preferably, the number of turns for measuring winding N2 is 1000 circles, and the number of turns of balance winding N3 is 1000 circles, and load resistance R1 is
The metalfilmresistor of 1 kilohm of 0.1% precision, leakage impedance R2 depend on enameled wire impedance parameter, about 100 ohm, adjust electricity
Hinder the metalfilmresistor that R3 is 50 ohm of 0.1% precision.Operational amplifier selects the operation of ADI companies of U.S. AD820AR models
Amplifier.
In one embodiment of the invention, the signal processing unit of cell array insulation fault monitoring system includes：Simulation numeral
Converter, digital signal processor and electrooptic switching element.The leakage current that analog-digital converter measures detection unit turns
Become digital signal；Digital signal processor connects analog-digital converter, for converting digital signals into serial digital letter
Number；Electrooptic switching element connects digital signal processor, for serial digital signal to be converted to optical signal.
It please refers to again shown in Fig. 3, Fig. 3 is the structure chart of the signal processing unit of one embodiment of the invention, difference shown in Fig. 3
It is instrumentation amplifier, the leakage current V for receiving detection unit measurement to divide amplifier 1211(t), in order to improve measurement accuracy,
In two input sides configuration of instrumentation amplifier 121, there are two one end of balance resistance R, each balance resistance R to be connected to instrument with putting
The input terminal of big device 121, the other end ground connection of each balance resistance R, instrumentation amplifier 121 are also configured with external amplification resistance RG,
It can be by adjusting external amplification resistance RGValue adjust the amplification factor of instrumentation amplifier.
Preferably, in one embodiment of the invention, the instrumentation amplifier of the AD620BR models of ADI companies of the U.S., the instrument are selected
It is 100 kilohms with the balance resistance R values of amplifier input side, RGIt is 18 kilohms.In other embodiments of the present invention, poor
The value of the amplifier for dividing amplifier that can select other forms and model, balance resistance and external amplification resistance, which can also regard, to be passed
The measurement leakage current values of sensor output select suitable value.
In view of through the amplified leakage current signal of difference amplifier, there are high-frequency interferencing signal, one embodiment of the invention
In, multiple referring to Fig. 3, signal processing unit further includes a frequency overlapped-resistable filter 122, the input of frequency overlapped-resistable filter 122 terminates
The measurement leakage current signal that difference amplifier 121 amplifies is received, the output end of frequency overlapped-resistable filter 122 is connected to A/D converter
123 input terminal, the frequency overlapped-resistable filter 122 can filter out high-frequency interferencing signal.After the filtering of frequency overlapped-resistable filter 122, A/D
Converter 123 becomes digital signal by the signal that frequency overlapped-resistable filter 122 exports is measured, through digital signal processing circuit 124
Digital signal is become serial digital signal by processing, and serial digital signal is passed after the transformation of electrooptic switching element 125 by optical fiber
Transport to monitoring room.In the present embodiment, addition frequency overlapped-resistable filter can effectively prevent amplified let out in signal processing unit
Aliasing occurs for leakage current signal can be effective using the transmission mode of optical fiber to improve the sampling precision of leakage current
Resistance external interference signals.
One embodiment of the invention, in order to simplify processing unit, signal processing unit further includes a multiway analog switch, below
By taking four path analoging switch as an example, i.e., the branch of mesuring battary array is 4 tunnels, although described by taking four path analoging switch as an example below,
But it is not intended to limit the present invention, those skilled in the art can select multiway analog switch according to actual conditions.As shown in figure 4,
Signal processing unit is by four difference amplifiers 121, four frequency overlapped-resistable filters 122, multiway analog switch 127, A/D converters
123, Digital Signal Processing 124 and electrooptic switching element 125 and power-supply system 126 form.Here the analog switch chosen is depending on waiting for
It surveys depending on branch case.Below for measuring four branched battery group leakage currents, corresponding analog switch is four-way switch,
The leakage current signal V that current sensor output is measured1(t)、V2(t)、V3(t)、V4(t) it is respectively fed to difference amplifier
Amplified measured signal is fed through anti-by 121 input terminal, each leakage current signal after the amplification of difference amplifier 121
In aliasing filter 122, to filter out amplified high-frequency interferencing signal, each amplified measured signal is through frequency overlapped-resistable filter
It is fed through multiway analog switch 127 after 122 filtering, the output end of multiway analog switch 127 is connected to A/D converter 123, multichannel
The selection of analog switch 127 is amplified filtered leakage current signal and is fed through in A/D converter 123 all the way, will after A/D is converted
The amplitude transition of corresponding leakage current signal is corresponding parallel digital signal, and is sent to digital signal processing circuit
124, digital signal processing circuit 124 is fed through electrooptic switching element after parallel digital signal is changed into serial digital signal
125, serial digital signal is changed into optical signal and is transmitted to monitoring room through optical fiber by electrooptic switching element 125, wherein optical signal is
Leakage situation can be judged.For difference amplifier 121, the frequency overlapped-resistable filter in battery pack insulating monitoring signal processing unit
122, the operating voltage of multiway analog switch 127, A/D converter 123, Digital Signal Processing 124 and electrooptic switching element 125 can
It is supplied by same power-supply system 126.
Preferably, electro-optic conversion can be in another embodiment of invention by light emitting diode in one embodiment of the invention
Laser diode is realized.
Shown in Figure 5, Fig. 5 is the power supply unit schematic diagram of one embodiment of the invention, wherein power supply unit includes：
One transformer 131, a rectification module 132 and a power conversion module 133.Transformer 131 is punching structure, transformer 131
Iron core sleeve be set on battery pack output cable, primary side inputs leakage current Ip to be measured, and transformer 131 by be measured for letting out
Leakage current Ip is transferred to the secondary side of transformer 131；The input terminal of one rectification module 132 is connected to the secondary side of transformer 131
Output end, for export a direct current signal；One power conversion module 133 is connected to the output end of rectification module 132, for becoming
The direct current signal for changing the output of rectification module 132, provides DC voltage V to signal processing unit.
Preferably, the rectification module in one embodiment of the invention is a full-bridge circuit, as shown in fig. 6, Fig. 6 is of the invention
The circuit construction of electric power figure of one embodiment.Leakage current Ip to be measured is the input current of the primary power source side of transformer 131, transformation
Device 131 is so that form Magnetic isolation between its primary power source and secondary circuit, and by the leakage current Ip of primary power source side with electromagnetism
The mode of coupling is transferred to the secondary circuit side of transformer 131, as shown in fig. 6, IsFor transformer secondary circuit loop electric current, become
Depressor secondary circuit loop current IsIt flows through secondary side winding resistance Rs to be later connected with full-bridge circuit 132, full-bridge circuit 132 is used
Become direct current signal after the AC signal rectification for exporting transformer 131, a filter is parallel in the outlet side of full-bridge circuit 132
Wave capacitance C, the AC compounent in direct current signal for filtering out the output of full-bridge circuit 132.Full-bridge circuit 132 in power circuit
One load resistance R of outlet side parallel connectionL, wherein e0The as DC voltage of rectification module output.The direct current signal of output is fed through
The input terminal of power conversion unit 133 can export DC voltage V and insulate to battery pack after the transformation of power conversion unit 133
The signal processing unit of monitoring leakage electric current is powered.
In one embodiment of the invention, signal processing unit further includes another power-supply system, is used for voltage stabilizing, the power-supply system
The variation of the adjustment electric power output voltage for the property of can adapt to gives signal processing list so that output voltage can keep stable
Member provides stable power supply.
In one embodiment of the present invention, the value of the protective resistance Rs of secondary side is 1 ohm.In full-bridge circuit 132
Four diodes are germanium diode, it is preferred that the model MBR20200 of the germanium diode of selection, load resistance value are 20 Europe
Nurse.The selection of the specific value and model of each element is only one embodiment of the present of invention in above-mentioned power circuit, is not intended to
The present invention is limited, in other embodiments, other values can also be chosen, selection principle is depending on actual conditions demand.
The present invention can realize the accurate measurement of leakage current, improve the measurement accuracy of leakage current.Detection unit is surveyed
Magnitude is transmitted to signal processing unit, by amplification, filtering, A/D conversions, Digital Signal Processing and electro-optic conversion by analog signal
Become optical signal and be transmitted through the fiber to monitoring room, which can make the leakage current signal that guarantee measures in biography
Not by electromagnetic interference during defeated, the precision of transmission is improved.Electric energy using the ripple component of leakage current is signal processing list
Member power supply, so as to provide power supply nearby for the signal processing unit of leakage current, to save the application of metallic cable, subtracts
Light site operation amount.
Embodiment described above is only used to illustrate the technical scheme of the present invention, and any those of ordinary skill in the art can be
Without prejudice under the spirit and scope of the present invention, modifications and changes are made to the above embodiments.Therefore, protection scope of the present invention is answered
Subject to right.
Claims (12)
1. cell array insulation fault monitors system, for monitoring cell array earth leakage current, which is characterized in that the prison
Examining system includes：Detection unit, signal processing unit and power supply unit；
The detection unit generates a detection signal for measuring leakage current；
The signal processing unit receives the detection signal, and to detection signal progress signal processing, at the signal
It includes an electrooptic switching element to manage unit, and prison is transmitted through the fiber to after the detection signal after signal processing is converted to optical signal
Control room；
The power supply unit inputs the leakage current, exports DC voltage and powers to the signal processing unit；
The detection unit includes three winding core sensor and operational amplifier；
The three winding core sensor is a punching structure, and armature winding side inputs the leakage current；
The primary side of the three winding core sensor includes measuring winding and balance winding,
The first end output for measuring winding measures electric current, and the second end for measuring winding is connected to the operational amplifier
The first end of the second end of output end and the balance winding, the balance winding connects the anti-phase input of the operational amplifier
The second end at end, the balance winding is connected to the operational amplifier output terminal and measures the second end of winding, the operation
The in-phase input end of amplifier is connected with the operational amplifier output terminal.
2. cell array insulation fault as described in claim 1 monitors system, which is characterized in that the three winding iron core sensing
Device further includes a leakage impedance, a regulation resistance；
The leakage impedance is connected between the second end for measuring winding and the second end of the balance winding；
The regulation resistance is connected between the operational amplifier output terminal and the second end of the balance winding.
3. cell array insulation fault as described in claim 1 monitors system, which is characterized in that the signal processing unit is also
Including：The leakage current that the detection unit measures is changed into digital signal by analog-digital converter；
Digital signal processor connects the analog-digital converter, for converting digital signals into serial digital signal；
Wherein, the electrooptic switching element connects the digital signal processor, for serial digital signal to be converted to light letter
Number.
4. cell array insulation fault as claimed in claim 3 monitors system, which is characterized in that the signal processing unit is also
Including difference amplifier, the leakage current measured for amplifying the detection unit, described in the input terminal of difference amplifier receives
The leakage current that detection unit measures, the output end of difference amplifier are connected to the input terminal of the analog-digital converter.
5. cell array insulation fault as claimed in claim 4 monitors system, which is characterized in that the signal processing unit is also
Including frequency overlapped-resistable filter, the frequency overlapped-resistable filter be connected to the difference amplifier and the analog-digital converter it
Between.
6. cell array insulation fault as claimed in claim 5 monitors system, which is characterized in that the frequency overlapped-resistable filter is
Second-order low-pass filter.
7. cell array insulation fault as claimed in claim 3 monitors system, which is characterized in that the signal processing unit packet
Include multiple difference amplifiers and frequency overlapped-resistable filter corresponding with the difference amplifier and a multiway analog switch, wherein
The input terminal of each difference amplifier receives the leakage current that the detection unit of each battery branch measures respectively, each described
The output end of difference amplifier is connected to the input terminal of each frequency overlapped-resistable filter, the output end of each frequency overlapped-resistable filter
It is connected to each input terminal of the multiway analog switch, the output end of the multiway analog switch is connected to the simulation numeral and turns
The input terminal of parallel operation.
8. cell array insulation fault as claimed in claim 3 monitors system, which is characterized in that the electrooptic switching element packet
Include light emitting diode.
9. cell array insulation fault as described in claim 1 monitors system, which is characterized in that the power supply unit includes：
Transformer, the transformer are a punching structure, and primary side input is leakage current to be measured, and being used for will be described to be measured
Leakage current electric energy is transferred to the secondary side of transformer；
Rectification module, the input terminal of the rectification module are connected to the output end of the Circuit Fault on Secondary Transformer, are used for rectifier transformer
Device secondary side exports electricity；
Power conversion module is connected to the output end of the rectification module, for filtering out in the rectification module output electricity
AC ripple component.
10. cell array insulation fault as claimed in claim 9 monitors system, which is characterized in that the rectification module is one
Full-bridge circuit.
11. cell array insulation fault as claimed in claim 9 monitors system, which is characterized in that the power conversion module
For a ∏ shape filter circuits.
12. cell array insulation fault as claimed in claim 9 monitors system, which is characterized in that the power circuit also wraps
A filter capacitor is included, the output end of the rectification module is parallel to, the of ac of electricity is exported for filtering out rectification module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410729791.1A CN105717403B (en) | 2014-12-04 | 2014-12-04 | Cell array insulation fault monitors system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410729791.1A CN105717403B (en) | 2014-12-04 | 2014-12-04 | Cell array insulation fault monitors system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105717403A CN105717403A (en) | 2016-06-29 |
| CN105717403B true CN105717403B (en) | 2018-09-07 |
Family
ID=56143320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410729791.1A Active CN105717403B (en) | 2014-12-04 | 2014-12-04 | Cell array insulation fault monitors system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105717403B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108490359B (en) * | 2018-03-19 | 2020-11-17 | 东软睿驰汽车技术（上海）有限公司 | Equipment for detecting insulativity of power battery pack, power system and automobile |
| CN109443628B (en) * | 2018-12-20 | 2024-08-16 | 中国工程物理研究院应用电子学研究所 | High-power microwave source strong electromagnetic environment air pressure measuring device |
| CN114335768B (en) * | 2021-11-23 | 2024-05-24 | 深圳供电局有限公司 | Discharging device, discharging method and application of waste lithium iron phosphate battery |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101247091A (en) * | 2008-03-28 | 2008-08-20 | 上海三基电子工业有限公司 | Linear electric power with low output ripple voltage |
| CN201374018Y (en) * | 2009-03-24 | 2009-12-30 | 福建顺昌虹润精密仪器有限公司 | Linear stabilized voltage power supply |
| CN101634679A (en) * | 2009-07-14 | 2010-01-27 | 国网电力科学研究院武汉南瑞有限责任公司 | Intelligent insulator online monitoring method and system |
| CN101694969A (en) * | 2009-10-22 | 2010-04-14 | 卧龙电气集团股份有限公司 | Variable-frequency speed control input voltage conversion device and method thereof |
| CN201449415U (en) * | 2009-07-13 | 2010-05-05 | 珠海市澳特尔测控仪表有限公司 | Alternating-current/direct-current leakage current sensor |
| CN102129018A (en) * | 2011-01-13 | 2011-07-20 | 华北电力大学 | Insulation online monitoring method for high-voltage capacitive equipment |
| CN201994866U (en) * | 2011-01-14 | 2011-09-28 | 杭州通测微电子有限公司 | Power supply of compact peripheral component interconnect (CPCI) low ripple industrial control computer |
| CN102749562A (en) * | 2012-07-13 | 2012-10-24 | 安徽安凯汽车股份有限公司 | Insulation monitoring device and monitoring method of power cell of electric vehicle |
| CN102879722A (en) * | 2012-09-20 | 2013-01-16 | 江苏技术师范学院 | Volt-ampere performance testing device and method for solar array |
| JP5480572B2 (en) * | 2009-09-16 | 2014-04-23 | 中部電力株式会社 | Ground fault detection device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5385688B2 (en) * | 2009-06-10 | 2014-01-08 | 矢崎総業株式会社 | Insulation resistance detector |
-
2014
- 2014-12-04 CN CN201410729791.1A patent/CN105717403B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101247091A (en) * | 2008-03-28 | 2008-08-20 | 上海三基电子工业有限公司 | Linear electric power with low output ripple voltage |
| CN201374018Y (en) * | 2009-03-24 | 2009-12-30 | 福建顺昌虹润精密仪器有限公司 | Linear stabilized voltage power supply |
| CN201449415U (en) * | 2009-07-13 | 2010-05-05 | 珠海市澳特尔测控仪表有限公司 | Alternating-current/direct-current leakage current sensor |
| CN101634679A (en) * | 2009-07-14 | 2010-01-27 | 国网电力科学研究院武汉南瑞有限责任公司 | Intelligent insulator online monitoring method and system |
| JP5480572B2 (en) * | 2009-09-16 | 2014-04-23 | 中部電力株式会社 | Ground fault detection device |
| CN101694969A (en) * | 2009-10-22 | 2010-04-14 | 卧龙电气集团股份有限公司 | Variable-frequency speed control input voltage conversion device and method thereof |
| CN102129018A (en) * | 2011-01-13 | 2011-07-20 | 华北电力大学 | Insulation online monitoring method for high-voltage capacitive equipment |
| CN201994866U (en) * | 2011-01-14 | 2011-09-28 | 杭州通测微电子有限公司 | Power supply of compact peripheral component interconnect (CPCI) low ripple industrial control computer |
| CN102749562A (en) * | 2012-07-13 | 2012-10-24 | 安徽安凯汽车股份有限公司 | Insulation monitoring device and monitoring method of power cell of electric vehicle |
| CN102879722A (en) * | 2012-09-20 | 2013-01-16 | 江苏技术师范学院 | Volt-ampere performance testing device and method for solar array |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105717403A (en) | 2016-06-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102841258B (en) | Measuring device and method for direct current supply output impedance | |
| US8907664B2 (en) | Non-intrusive monitoring of power and other parameters | |
| CN110007133B (en) | Digital AC/DC current sensor and current detection method | |
| CN204807623U (en) | Acquisition circuit and contain this acquisition circuit's battery management system | |
| CN102654571B (en) | Comprehensive tester of current transformer | |
| CN202837406U (en) | DC power supply output impedance measuring device | |
| MX2008015823A (en) | Sensing current flowing through a power line. | |
| CN105093140A (en) | Transformer remanence detection and demagnetization method and device | |
| CN105717403B (en) | Cell array insulation fault monitors system | |
| CN110098758A (en) | Device and method for the feedback sense in multi-cell electric power | |
| EP2116854B1 (en) | Active current sensor and current measuring device | |
| CN203871167U (en) | Center penetrating type isolation current transformer | |
| CN100585759C (en) | Wide band high voltage intelligent resistance type voltage current combined sensor | |
| CN101231311A (en) | Wide band high pressure intelligent resistance type current sensor | |
| CN111198297A (en) | Signal acquisition device based on Rogowski coil and zero-flux current sensor | |
| CN112415249A (en) | Zero-flux current transformer and error modulation method | |
| CN103439682B (en) | A kind of portable type current transformer combination misalignment proving installation is adopted to carry out the method for methods of composite errors on current transformer test | |
| CN107132167A (en) | High precision two line system industrial dust detection means | |
| CN102436995B (en) | Hall high voltage detection control method applied to traveling wave tube program control high voltage power supply | |
| CN101650379A (en) | Combined type sensor | |
| CN103018571A (en) | Dual-coupling type on-line monitoring device of ground impedance of electric transmission line | |
| JP2021081240A (en) | Electric signal detector | |
| US10481180B2 (en) | Method for sensing power consumption and sensing device | |
| CN115097182A (en) | Dual-output measurement's alternating current-direct current sensor's adapter device | |
| CN205539129U (en) | Three -phase electronic type combined mutual inductor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |