CN105717403A - Insulation fault monitoring system for cell array - Google Patents
Insulation fault monitoring system for cell array Download PDFInfo
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- CN105717403A CN105717403A CN201410729791.1A CN201410729791A CN105717403A CN 105717403 A CN105717403 A CN 105717403A CN 201410729791 A CN201410729791 A CN 201410729791A CN 105717403 A CN105717403 A CN 105717403A
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Abstract
The invention relates to an insulation fault monitoring system for a cell array, and the system is used for monitoring a grounding leakage current of the cell array. The system comprises a detection unit, a signal processing unit, and a power unit. The detection unit is used for measuring a leakage current and generating a detection signal. The signal processing unit is used for receiving the detection signal, and carrying out the processing of the detection signal. The signal processing unit comprises an electro-optic conversion unit, converts the detection signal after signal processing into a light signal, and transmits the light signal to a monitoring room through an optical fiber. A power unit inputs the leakage current and outputs a DC voltage to the signal processing unit for power supply. The system can achieve the accurate measurement of the leakage current, improves the measurement precision of the leakage current, can guarantee that the measured leakage current signal is not affected by electromagnetic interference in a transmission process, and improves the transmission precision.
Description
Technical field
The present invention relates to fault monitoring system, particularly to a kind of array insulation fault monitoring system.
Background technology
The capacity of single battery and electricity are all relatively low, therefore, general single battery is concatenated and and be unified into certain voltage and electric current set of cells (or array) after using, but, this single battery is concatenated, branch road leakage current easily occurs on the branch road of each array in set of cells after parallel combination.
In array insulation fault monitoring system, measurement set of cells branch road leakage current over the ground is generally adopted to realize.Due to the DC current that set of cells branch road earth leakage current is faint, to this kind of electric current, traditional measuring method is to adopt Hall current sensor.But there is, when measuring weak current, the problem that certainty of measurement is low in Hall current sensor.Owing in reality, leakage current amplitude is generally only small, it is typically in below milliampere level, even arrives microampere order.In this case, conventional Hall current sensor even cannot meet the measurement demand of reality.
In array insulation fault monitoring process, it is necessary to faint leakage current signal measurement arrived, it is delivered to fault detect integrated treatment unit.In prior art, the processing mode conventional for the Leakage Current signal collected is that leakage current to be measured is after over sampling, transmitted by cable copper cash, owing to Leakage Current signal is fainter, the mode adopting copper conductor transmission leakage current signal is subject to electromagnetic interference, thus bringing very big error and data distortion to the measurement of leakage current.
Meanwhile, to each array branch road leakage current measurement time, it is necessary to the signal processing circuit for leakage current provides power supply.For the power supply needed for signal processing circuit, current China is typically with the mode of centralized function, if adopting the mode of outside central energy supply, when array number of branches to be measured is numerous, being accomplished by laying a large amount of metallic cable, it is very huge that this may result in site operation amount.
Summary of the invention
Set of cells insulation fault provided by the invention monitoring system, it is possible to realize the accurate measurement of leakage current, thus improve the certainty of measurement of leakage current.
The technical scheme is that a kind of array insulation fault monitoring system of offer, be used for monitoring array earth leakage current, wherein, monitoring system includes: detection unit, signal processing unit and power subsystem.Detection unit is used for measuring leakage current, and produces a detection signal；Signal processing unit receives detection signal, and detection signal is carried out signal processing, and described signal processing unit includes an electrooptic switching element, is transmitted through the fiber to Control Room after the detection signal after signal processing is converted to optical signal；Power subsystem input leakage current, converts it, and output DC voltage is powered to signal processing unit.
In one embodiment of the invention, detection unit includes three winding core sensor and operational amplifier.Three winding core sensor is a punching structure, and the input quantity of its armature winding is leakage current；The primary side of three winding core sensor includes measuring winding and balance winding, electric current is measured in the first end output measuring winding, the second end measuring winding is connected to operational amplifier output terminal and the second end of balance winding, the inverting input of the first end concatenation operation amplifier of balance winding, second end of balance winding is connected to operational amplifier output terminal and measures the second end of winding, and the in-phase input end of operational amplifier is connected with operational amplifier output terminal.
In one embodiment of the invention, three winding core sensor also includes a leakage impedance, and one regulates resistance；Leakage impedance is connected between the second end of the second end measuring winding and balance winding；Regulate between the second end that resistance is connected to operational amplifier output terminal and balance winding.
In one embodiment of the invention, signal processing unit also includes: analog-digital converter, digital signal processor.The leakage current that detection unit is measured is changed into digital signal by analog-digital converter；Digital signal processor connects analog-digital converter, is used for converting digital signals into serial digital signal；Wherein, electrooptic switching element, connect digital signal processor, for serial digital signal is converted to optical signal.
In one embodiment of the invention, signal processing unit also includes difference amplifier, for the leakage current that amplification detection unit is measured, the input of difference amplifier receives the leakage current that detection unit is measured, and the outfan of difference amplifier is connected to the input of analog-digital converter.
In one embodiment of the invention, signal processing unit also includes frequency overlapped-resistable filter, and frequency overlapped-resistable filter is connected between difference 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 amplifier and the frequency overlapped-resistable filter corresponding with difference amplifier and a multiway analog switch, wherein,
The input of each difference amplifier receives the leakage current that the detection unit of each battery branch road is measured respectively, the outfan of each difference amplifier is connected to the input of each frequency overlapped-resistable filter, the outfan of each frequency overlapped-resistable filter is connected to each input of multiway analog switch, and the outfan of multiway analog switch is connected to the input of analog-digital converter.
In one embodiment of the invention, electrooptic switching element includes light emitting diode.
In one embodiment of the invention, power subsystem includes: transformator, rectification module and power conversion module.
Transformator is a punching structure, and the input of its primary side is leakage current to be measured, for leakage current electric energy to be measured is transferred to the secondary side of transformator；The input of rectification module is connected to the outfan of Circuit Fault on Secondary Transformer, for the electricity of rectifier transformer secondary side output；Power conversion module, is connected to the outfan of rectification module, for filtering the AC ripple component in rectification module output 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 circuit.
In one embodiment of the invention, power circuit also includes a filter capacitor, is parallel to the outfan of rectification module, for filtering the of ac of rectification module output electricity.
Technical scheme in sum, the present invention is by detecting unit, it is possible to realize the accurate measurement of leakage current, thus improve the certainty of measurement of leakage current.Detection unit transmitting measured values is to signal processing unit, analogue signal is become optical signal be transmitted through the fiber to Control Room by amplification, filtering, A/D conversion, Digital Signal Processing and electro-optic conversion, this signal processing unit can make the leakage current signal that guarantee is measured not be subject to electromagnetic interference in transmitting procedure, improves the precision of transmission.The electric energy utilizing the ripple component of leakage current is powered for signal processing unit, so as to providing power supply for the signal processing unit of leakage current nearby, thus saving the application of metallic cable, alleviating site operation amount.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below the accompanying drawing used required during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structure chart of one embodiment of the invention array insulation fault monitoring 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；
Reference numeral illustrates:
Ip: leakage current to be measured；
11: detection unit；
12: signal processing unit:
13: power subsystem；
14: Control 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 transducer；
124: digital signal processing circuit；
125: electrooptic switching element；
126: power-supply system；
131: transformator；
132: rectification module；
133: power conversion unit.
Detailed description of the invention
Technical characterstic and effect in order to make the present invention become apparent from; below in conjunction with accompanying drawing, technical scheme is described further; the present invention also can have other different instantiations be illustrated or implement, and the equivalents that any those skilled in the art do in right belongs to the protection category of the present invention.It should be noted that accompanying drawing is merely to illustrate technical scheme, it is not offered as the concrete structure of array insulation fault monitoring system components.
As it is shown in figure 1, the structure chart that Fig. 1 is one embodiment of the invention array insulation fault monitoring system, array insulation fault monitoring system includes: detection unit 11, signal processing unit 12 and power subsystem 13.Detection unit 11 is used for measuring leakage current Ip, and produce a detection signal, signal processing unit 12 receives the detection signal of detection unit 11, and the detection signal of detection unit 11 output is carried out signal processing, by the detection signal after process through fiber-optic transfer to Control Room 14, leakage current Ip is converted by power subsystem 13, is powered to signal processing unit 12 by the output voltage after conversion.
Array forms set of cells after parallel connection, series connection, and set of cells has two output cables, represents the both positive and negative polarity of set of cells respectively, refers to the circuit diagram of the detection unit that Fig. 2, Fig. 2 are one embodiment of the invention.Detection unit includes three winding core sensor 111 and operational amplifier 112.Three winding core sensor is punching structure, and the iron core sleeve of described three winding core sensor is located on set of cells output cable, and the armature winding N1 side input quantity of three winding core sensor is leakage current Ip to be measured.The primary side of three winding core sensor 111 includes measuring winding N2 and balance winding N3.In one embodiment of the invention, consulting shown in Fig. 2, detection unit also includes leakage impedance R2 and regulates resistance R3.Regulate resistance R3 to limit operational amplifier 112 and lack of proper care, and can attenuated signal low-frequency disturbance when measuring.Leakage impedance R2 is series between second end 4 of the second end 2 measuring winding N2 and balance winding N3, regulates between resistance R3 the second end 4 being series at operational amplifier output terminal 7 and balance winding.Measuring the first end 1 output detections signal of winding, the electric current namely flowing through load resistance R1 is the electric current of measurement.The second end 2 measuring winding is connected to one end of leakage impedance R2, the inverting input 5 of the first end 3 concatenation operation amplifier of balance winding, second end 4 of balance winding is connected to the other end of leakage impedance R2 and regulates one end of resistance R3, and the in-phase input end 6 of operational amplifier 112 is connected with the other end of operational amplifier output terminal 7 and adjustment resistance R3.Balance winding N3 and operational amplifier 112 realize the compensation to iron core T exciting impedance so that in current sensor work process, iron core processes Zero flux state.Balance winding N3 is disposed to reduction exciting curent, its closed loop constituted with operational amplifier, and iron core can be made to be operated in " being similar to " Zero flux state.
The purpose adopting this compensation way is to reduce the contribution to measurement error of the iron core exciting current.After increasing balance winding N3 and operational amplifier 112, the essential condition that iron core exciting current will not be the work of this current sensor.And existing compensation method (electromotive force compensate, magnetomotive force compensation) is required for greatly exciting current as necessary working condition.Now, utilize " empty short " " empty disconnected " characteristic of operational amplifier 112 end of oppisite phase 5, in-phase end 6, exciting current is reduced so that iron core T is operationally in " being similar to " Zero flux state；Now, although exciting current is only small, but current measurement accuracy can't be affected.After selection has the operational amplifier of premium properties parameter, will further improve current measurement accuracy.
In this embodiment, owing to three winding core sensor is punching structure, electric leakage current branch road to be measured is its armature winding.Then, in order to not change leakage current branch structure to be measured, the number of turn of armature winding N1 here can be considered 1 circle.The number of turn of the number of turn and balance winding N3 of measuring winding N2 can be inconsistent, if inconsistent being accomplished by adjusts the resistance regulating resistance R3.The number of turn of the number of turn and balance winding N3 of measuring winding N2 should be as far as possible larger, it is possible to strengthens magnetic coupling, reduces iron core leakage field；But it is not easy to too big, if too big leakage impedance R2 can increase, it is possible to cause to be set to negative impedance state by regulating resistance R3.Can be according to demand in reality, select to measure the number of turn of the number of turn of the number of turn of winding N2 and balance winding N3, it is generally the case that can set that the number of turn measuring winding N2 is 1000 circles, the number of turn of balance winding N3, between 500～1000 circles, is so then prone to adjust the resistance regulating resistance R3.
Preferably, the number of turn measuring winding N2 is 1000 circles, and the number of turn of balance winding N3 is 1000 circles, load resistance R1 is the metalfilmresistor of 1 kilohm of 0.1% precision, leakage impedance R2 depends on enamel-covered wire impedance parameter, is about 100 ohm, regulates the metalfilmresistor that resistance R3 is 50 ohm of 0.1% precision.Operational amplifier selects the operational amplifier of ADI company of U.S. AD820AR model.
In one embodiment of the invention, the signal processing unit of array insulation fault monitoring system includes: analog-digital converter, digital signal processor and electrooptic switching element.The leakage current that detection unit is measured is changed into digital signal by analog-digital converter；Digital signal processor connects analog-digital converter, is used for converting digital signals into serial digital signal；Electrooptic switching element, connects digital signal processor, for serial digital signal is converted to optical signal.
Referring to again shown in Fig. 3, Fig. 3 is the structure chart of the signal processing unit of one embodiment of the invention, and the difference amplifier 121 shown in Fig. 3 is instrumentation amplifier, for receiving the leakage current V that detection unit is measured1(t), in order to improve certainty of measurement, two input sides in instrumentation amplifier 121 are configured with two balancing resistance R, and one end of each balancing resistance R is connected to the input of instrumentation amplifier 121, the other end ground connection of each balancing resistance R, instrumentation amplifier 121 is also configured with external amplification resistance RG, can pass through to adjust external amplification resistance RGValue adjust the amplification of instrumentation amplifier.
Preferably, in one embodiment of the invention, selecting the instrumentation amplifier of the AD620BR model of ADI company of the U.S., the balancing resistance R value of this instrumentation amplifier input side is 100 kilohms, RGIt it is 18 kilohms.In other embodiments of the present invention, difference amplifier can select the amplifier of other form and model, and the value of balancing resistance and external amplification resistance can also the measurements leakage current values suitable value of selection of view sensor output.
Consider that the leakage current signal after difference amplifier amplifies exists high-frequency interferencing signal, in one embodiment of the invention, refer to Fig. 3 again, signal processing unit also includes a frequency overlapped-resistable filter 122, the input of frequency overlapped-resistable filter 122 receives the measurement leakage current signal that difference amplifier 121 amplifies, the outfan of frequency overlapped-resistable filter 122 is connected to the input of A/D converter 123, and this frequency overlapped-resistable filter 122 can filter high-frequency interferencing signal.After frequency overlapped-resistable filter 122 filters, the signal that measurement frequency overlapped-resistable filter 122 exports is become digital signal by A/D converter 123, process through digital signal processing circuit 124, digital signal is become serial digital signal, serial digital signal is after electrooptic switching element 125 converts, by fiber-optic transfer to Control Room.In the present embodiment, signal processing unit adds frequency overlapped-resistable filter and can effectively prevent the leakage current signal generation aliasing after amplifying, in order to improve the sampling precision of leakage current, adopt the transmission means of optical fiber can effectively resist external interference signals.
One embodiment of the invention, in order to simplify processing unit, signal processing unit also includes a multiway analog switch, below for four path analoging switch, namely the branch road of mesuring battary array is 4 tunnels, although described for four path analoging switch below, but it is not intended to limit the present invention, those skilled in the art can select multiway analog switch according to practical situation.As shown in Figure 4, signal processing unit is made up of 121, four frequency overlapped-resistable filters 122 of four difference amplifiers, multiway analog switch 127, A/D converter 123, Digital Signal Processing 124 and electrooptic switching element 125 and power-supply system 126.Here the analog switch chosen is depending on branch case to be measured.Below to measure four branched battery group leakage currents, corresponding analog switch is four-way switch, leakage current signal V current sensor output measured1(t)、V2(t)、V3(t)、V4T () is respectively fed to the input to difference amplifier 121, each leakage current signal is after difference amplifier 121 amplifies, measured signal after amplifying is fed through in frequency overlapped-resistable filter 122, to filter the high-frequency interferencing signal after amplification, measured signal after each amplification is fed through multiway analog switch 127 after frequency overlapped-resistable filter 122 filters, the outfan of multiway analog switch 127 is connected to A/D converter 123, multiway analog switch 127 selects a road filtered leakage current signal of amplification to be fed through in A/D converter 123, by the parallel digital signal that amplitude transition is correspondence of corresponding leakage current signal after A/D changes, and be sent to digital signal processing circuit 124, digital signal processing circuit 124 is fed through electrooptic switching element 125 after parallel digital signal is changed into serial digital signal, serial digital signal is changed into optical signal through fiber-optic transfer to Control Room by electrooptic switching element 125, wherein, optical signal can pass judgment on leakage situation.Running voltage for the difference amplifier 121 in set of cells insulating monitoring signal processing unit, frequency overlapped-resistable filter 122, multiway analog switch 127, A/D converter 123, Digital Signal Processing 124 and electrooptic switching element 125 can be supplied by same power-supply system 126.
Preferably, in one embodiment of the invention, electro-optic conversion by light emitting diode, can realize for laser diode in another embodiment of invention.
Shown in Figure 5, Fig. 5 is the power subsystem schematic diagram of one embodiment of the invention, and wherein, power subsystem includes: transformator 131, rectification module 132 and a power conversion module 133.Transformator 131 is punching structure, and the iron core sleeve of transformator 131 is located on set of cells output cable, and its primary side inputs leakage current Ip to be measured, and transformator 131 for being transferred to the secondary side of transformator 131 by leakage current Ip to be measured；The input of one rectification module 132 is connected to the outfan of the secondary side of transformator 131, is used for exporting a direct current signal；One power conversion module 133 is connected to the outfan of rectification module 132, for converting the direct current signal of rectification module 132 output, it is provided that DC voltage V is to signal processing unit.
Preferably, the rectification module in one embodiment of the invention is a full-bridge circuit, and as shown in Figure 6, Fig. 6 is the circuit construction of electric power figure of one embodiment of the invention.Leakage current Ip to be measured is the input current of the primary power source side of transformator 131, transformator 131 makes formation Magnetic isolation between its primary power source and secondary circuit, and the leakage current Ip of primary power source side is transferred in the way of electromagnetic coupled the secondary circuit side of transformator 131, and as shown in Figure 6, IsFor transformer secondary circuit loop electric current, transformer secondary circuit loop electric current IsIt is connected with full-bridge circuit 132 after flowing through secondary side winding resistance Rs, full-bridge circuit 132 becomes direct current signal after being used for the AC signal rectification exported by transformator 131, outlet side at full-bridge circuit 132 is parallel with a filter capacitor C, for filtering the AC compounent in the direct current signal that full-bridge circuit 132 exports.Full-bridge circuit 132 outlet side in a power circuit load resistance R in parallelL, wherein, e0It is the DC voltage of rectification module output.The direct current signal of output is fed through the input of power conversion unit 133, and after power conversion unit 133 converts, just exportable DC voltage V is powered to the signal processing unit of set of cells insulating monitoring leakage current.
In one embodiment of the invention, signal processing unit also includes another power-supply system, for voltage stabilizing, the change adjusting electric power output voltage of this power-supply system property of can adapt to, so that output voltage can remain stable for, provide stable power supply to signal processing unit.
In one embodiment of the present invention, the value of the protective resistance Rs of secondary side is 1 ohm.Four diodes in full-bridge circuit 132 are germanium diode, it is preferred that the model of the germanium diode of selection is MBR20200, and load resistance value is 20 ohm.In above-mentioned power circuit, the concrete value of each element and choosing of model are only one embodiment of the present of invention, are not intended to limit the present invention, in other embodiments, it is also possible to choose other value, and selection principle is depending on practical situation demand.
The present invention is capable of the accurate measurement of leakage current, improves the certainty of measurement of leakage current.Detection unit transmitting measured values is to signal processing unit, analogue signal is become optical signal be transmitted through the fiber to Control Room by amplification, filtering, A/D conversion, Digital Signal Processing and electro-optic conversion, this signal processing unit can make the leakage current signal that guarantee is measured not be subject to electromagnetic interference in transmitting procedure, improves the precision of transmission.The electric energy utilizing the ripple component of leakage current is powered for signal processing unit, so as to providing power supply for the signal processing unit of leakage current nearby, thus saving the application of metallic cable, alleviating site operation amount.
Embodiment described above is merely to illustrate technical scheme, and above-described embodiment all under the spirit and category of the present invention, can carried out modifying and change by any those of ordinary skill in the art.Therefore, protection scope of the present invention should be as the criterion depending on right.
Claims (13)
1. array insulation fault monitoring system, is used for monitoring array earth leakage current, it is characterised in that described monitoring system includes: detection unit, signal processing unit and power subsystem；
Described detection unit is used for measuring leakage current, and produces a detection signal；
Described signal processing unit receives described detection signal, and described detection signal is carried out signal processing, and described signal processing unit includes an electrooptic switching element, is transmitted through the fiber to Control Room after the detection signal after signal processing is converted to optical signal；
Described power subsystem inputs described leakage current, and output DC voltage powers to described signal processing unit.
2. array insulation fault monitoring system as claimed in claim 1, it is characterised in that described detection unit includes three winding core sensor and operational amplifier；
Described three winding core sensor is a punching structure, and its armature winding side inputs described leakage current；
The primary side of described three winding core sensor includes measuring winding and balance winding,
Electric current is measured in first end output of described measurement winding, second end of described measurement winding is connected to described operational amplifier output terminal and the second end of described balance winding, first end of described balance winding connects the inverting input of described operational amplifier, second end of described balance winding is connected to described operational amplifier output terminal and measures the second end of winding, and the in-phase input end of described operational amplifier is connected with described operational amplifier output terminal.
3. array insulation fault monitoring system as claimed in claim 2, it is characterised in that described three winding core sensor also includes a leakage impedance, and regulates resistance；
Described leakage impedance is connected between the second end of described measurement winding and the second end of described balance winding；
Described adjustment resistance is connected between the second end of described operational amplifier output terminal and described balance winding.
4. array insulation fault monitoring system as claimed in claim 1, it is characterised in that described signal processing unit also includes: analog-digital converter, and the leakage current that described detection unit is measured is changed into digital signal；
Digital signal processor, connects described analog-digital converter, is used for converting digital signals into serial digital signal；
Wherein, described electrooptic switching element connects described digital signal processor, for serial digital signal is converted to optical signal.
5. array insulation fault monitoring system as claimed in claim 4, it is characterized in that, described signal processing unit also includes difference amplifier, for amplifying the leakage current that described detection unit is measured, the input of difference amplifier receives the leakage current that described detection unit is measured, and the outfan of difference amplifier is connected to the input of described analog-digital converter.
6. array insulation fault monitoring system as claimed in claim 5, it is characterised in that described signal processing unit also includes frequency overlapped-resistable filter, and described frequency overlapped-resistable filter is connected between described difference amplifier and described analog-digital converter.
7. array insulation fault monitoring system as claimed in claim 6, it is characterised in that described frequency overlapped-resistable filter is second-order low-pass filter.
8. array insulation fault monitoring system as claimed in claim 4, it is characterised in that described signal processing unit includes multiple difference amplifier and the frequency overlapped-resistable filter corresponding with described difference amplifier and a multiway analog switch, wherein,
The input of each described difference amplifier receives the leakage current that the detection unit of each battery branch road is measured respectively, the outfan of each described difference amplifier is connected to the input of each described frequency overlapped-resistable filter, the outfan of each described frequency overlapped-resistable filter is connected to each input of described multiway analog switch, and the outfan of described multiway analog switch is connected to the input of described analog-digital converter.
9. array insulation fault monitoring system as claimed in claim 4, it is characterised in that described electrooptic switching element includes light emitting diode.
10. array insulation fault monitoring system as claimed in claim 1, it is characterised in that described power subsystem includes:
Transformator, described transformator is a punching structure, and the input of its primary side is leakage current to be measured, for described leakage current electric energy to be measured is transferred to the secondary side of transformator；
Rectification module, the input of described rectification module is connected to the outfan of described Circuit Fault on Secondary Transformer, exports electricity for rectifier transformer secondary side；
Power conversion module, is connected to the outfan of described rectification module, for filtering the AC ripple component in described rectification module output electricity.
11. array insulation fault monitoring system as claimed in claim 10, it is characterised in that described rectification module is a full-bridge circuit.
12. array insulation fault monitoring system as claimed in claim 10, it is characterised in that described power conversion module is a ∏ shape filter circuit.
13. array insulation fault monitoring system as claimed in claim 10, it is characterised in that described power circuit also includes a filter capacitor, is parallel to the outfan of described rectification module, for filtering the of ac of rectification module output electricity.
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