CN109100625A - A kind of detection circuit for partial discharge and detector - Google Patents
A kind of detection circuit for partial discharge and detector Download PDFInfo
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- CN109100625A CN109100625A CN201811264914.3A CN201811264914A CN109100625A CN 109100625 A CN109100625 A CN 109100625A CN 201811264914 A CN201811264914 A CN 201811264914A CN 109100625 A CN109100625 A CN 109100625A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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- Testing Relating To Insulation (AREA)
Abstract
The application is suitable for electroporation field, provides a kind of detection circuit for partial discharge and detector, comprising: disc antenna detector and signal processing unit for induction field；The output end of the disc antenna detector connects the input terminal of the signal processing unit, and the output end of the signal processing unit is adapted to monitoring instrument；The disc antenna detector generates voltage signal after sensing electric field, and the signal processing unit is sent by the voltage signal, the signal processing unit handles the voltage signal, and voltage signal is sent to the monitoring instrument by treated.Using above-mentioned detection circuit, the phase information of high voltage side of transformer power-frequency voltage can be advantageously obtained, and then improve the efficiency of partial discharge of transformer on-line checking.
Description
Technical field
This application involves electroporation field more particularly to a kind of detection circuit for partial discharge and detector.
Background technique
Transformer is one of most important equipment of electric system, and reliability directly affects the safe and stable operation of power grid.
Shelf depreciation on-line checking is carried out to the insulation performance of power transformer, can find inside transformer insulation degradation shape in time
Condition is the important way for grasping transformer insulation state.
When carrying out partial discharge of transformer on-line checking, it usually needs obtain the phase information of high-pressure side power-frequency voltage.
And the method for the existing phase information for obtaining high-pressure side power-frequency voltage, confined condition is more in practical applications, convenience, reality
Poor with property, the efficiency so as to cause partial discharge of transformer on-line checking is lower.
Summary of the invention
In view of this, the embodiment of the present application provides a kind of detection circuit for partial discharge and detector, to solve existing skill
The phase information that high voltage side of transformer power-frequency voltage can not be advantageously obtained in art, is examined online so as to cause partial discharge of transformer
The problem of low efficiency of survey.
The first aspect of the embodiment of the present application provides a kind of detection circuit for partial discharge, comprising:
Disc antenna detector and signal processing unit for induction field；
The output end of the disc antenna detector connects the input terminal of the signal processing unit, the signal processing
The output end of unit is adapted to monitoring instrument；
The disc antenna detector generates voltage signal after sensing electric field, and sends institute for the voltage signal
Signal processing unit is stated, the signal processing unit handles the voltage signal, and voltage signal is sent out by treated
It is sent to the monitoring instrument.
Optionally, the signal processing unit includes:
Signal amplification module and filter module；
The first input end of the signal amplification module is the input terminal of the signal processing unit, and the signal amplifies mould
First output end of block connects the first input end of the filter module；
The signal amplification module receives the voltage signal that the sensing unit generates, and puts to the voltage signal
Big processing obtains amplified signal, the amplified signal is sent to the filter module, the filter module believes the amplification
It number is filtered to obtain filtering signal, and voltage signal is sent to the monitoring using the filtering signal as treated
Instrument.
Optionally, the signal amplification module includes:
First resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, two poles
Pipe, the first amplifier, the second amplifier, third amplifier and slide rheostat；
The first end of the first resistor be the signal amplification module first input end, the second of the first resistor
End is separately connected the first input end of the diode and the positive input terminal of first amplifier；
The first end of the second resistance connects after the second input terminal of the diode as the signal amplification module
The second input terminal, the second end of the second resistance connects the positive input terminal of second amplifier；
The first end of the 3rd resistor be separately connected first amplifier output end and the 5th resistance
One end, the second end of the 3rd resistor be separately connected the slide rheostat first end and first amplifier bear it is defeated
Enter end；
The first end of 4th resistance be separately connected the slide rheostat second end and second amplifier
Negative input end, the second end of the 4th resistance be separately connected second amplifier output end and the 7th resistance
One end；
The second end of 5th resistance is separately connected the first end of the 6th resistance and bearing for the third amplifier
Input terminal；
The second end of 6th resistance connects after the output end of the third amplifier as the signal amplification module
The first output end；
The second end of 7th resistance, which connects, amplifies mould as the signal after the positive input terminal of the third amplifier
The second output terminal of block.
Optionally, the diode is two-way type transient voltage suppressor diode.
Optionally, the filter module is Voltage Control Voltage Source type bandpass filtering modules block.
Optionally, the Voltage Control Voltage Source bandpass filtering modules block includes:
First filtering submodule, the second filtering submodule；
The first input end of the first filtering submodule is the first of the Voltage Control Voltage Source bandpass filtering modules block
Second input terminal of input terminal, the first filtering submodule is the second defeated of the Voltage Control Voltage Source bandpass filtering modules block
Entering end, the first output end of the first filtering submodule connects the first input end of the second filtering submodule, and described the
The second output terminal of one filtering submodule connects the second input terminal of the second filtering submodule, the first filtering submodule
Third output end connect it is described second filtering submodule third input terminal；
First output end of the second filtering submodule is the first of the Voltage Control Voltage Source bandpass filtering modules block
The second output terminal of output end, the second filtering submodule is the second defeated of the Voltage Control Voltage Source bandpass filtering modules block
Outlet.
Optionally, the first filtering submodule includes:
8th resistance, the 9th resistance, the tenth resistance, eleventh resistor, first capacitor, the second capacitor and the 4th amplifier；
The first end of 8th resistance is the first input end of the first filtering submodule, the of the 8th resistance
After two ends are separately connected the first end of the first end of the 9th resistance, the first end of the first capacitor and second capacitor
Third output end as the first filtering submodule；
The second end of 9th resistance connects after the first end of the eleventh resistor respectively as first filtering
The second input terminal and second output terminal of submodule；
The first end of tenth resistance be separately connected the first capacitor second end and the 4th amplifier it is defeated
The first output end after outlet as the first filtering submodule, the second end of the tenth resistance are separately connected described second
The negative input end of the second end of capacitor and the 4th amplifier；
The second end of the eleventh resistor connects the positive input terminal of the 4th amplifier.
Optionally, the second filtering submodule includes:
Twelfth resistor, thirteenth resistor, the 14th resistance, the 15th resistance and the 5th amplifier；
The first end of the twelfth resistor is the third input terminal of the second filtering submodule, the twelfth resistor
Second end be separately connected after the first end of the 15th resistance and the output end of the 5th amplifier as described second
Filter the first output end of submodule；
The first end of the thirteenth resistor is the first input end of the second filtering submodule, the thirteenth resistor
Second end be separately connected the second end of the 15th resistance and the negative input end of the 5th amplifier；
The first end of 14th resistance is respectively the second input terminal and described second of the second filtering submodule
The second output terminal of submodule is filtered, the second end of the 14th resistance connects the positive input terminal of the 5th amplifier.
The second aspect of the embodiment of the present application provides a kind of detector, and the first aspect including such as the embodiment of the present application mentions
The detection circuit for partial discharge of confession.
Existing beneficial effect is the embodiment of the present application compared with prior art:
The embodiment of the present application answers power frequency electric field from transformer accessory spatial impression using disc antenna detector, so as to
Advantageously obtain the phase information of high voltage side of transformer power-frequency voltage, i.e. voltage signal, using signal processing unit to getting
Voltage signal handled, thus obtain monitor be easy to monitor signal.By above-mentioned detection circuit for partial discharge, effectively
Improve the efficiency of partial discharge of transformer on-line checking.
Detailed description of the invention
It in order to more clearly explain the technical solutions in the embodiments of the present application, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only some of the application
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the schematic diagram of detection circuit for partial discharge provided by the embodiments of the present application；
Fig. 2 is the schematic diagram of signal processing unit provided by the embodiments of the present application；
Fig. 3 is the circuit diagram of signal amplification module provided by the embodiments of the present application；
Fig. 4 is the circuit diagram of filter module provided by the embodiments of the present application.
Specific embodiment
In being described below, for illustration and not for limitation, the tool of such as particular system structure, technology etc is proposed
Body details, so as to provide a thorough understanding of the present application embodiment.However, it will be clear to one skilled in the art that there is no these specific
The application also may be implemented in the other embodiments of details.In other situations, it omits to well-known system, device, electricity
The detailed description of road and method, so as not to obscure the description of the present application with unnecessary details.
It should be appreciated that ought use in this specification and in the appended claims, term " includes " instruction is described special
Sign, entirety, step, operation, the presence of element and/or component, but be not precluded one or more of the other feature, entirety, step,
Operation, the presence or addition of element, component and/or its set.
It is also understood that mesh of the term used in this present specification merely for the sake of description specific embodiment
And be not intended to limit the application.As present specification and it is used in the attached claims, unless on
Other situations are hereafter clearly indicated, otherwise " one " of singular, "one" and "the" are intended to include plural form.
It will be further appreciated that the term "and/or" used in present specification and the appended claims is
Refer to any combination and all possible combinations of one or more of associated item listed, and including these combinations.
As used in this specification and in the appended claims, term " if " can be according to context quilt
Be construed to " when ... " or " once " or " in response to determination " or " in response to detecting ".Similarly, phrase " if it is determined that " or
" if detecting [described condition or event] " can be interpreted to mean according to context " once it is determined that " or " in response to true
It is fixed " or " once detecting [described condition or event] " or " in response to detecting [described condition or event] ".
In order to illustrate technical solution described herein, the following is a description of specific embodiments.
Fig. 1 is the schematic diagram of detection circuit for partial discharge provided by the embodiments of the present application, as shown, the shelf depreciation
Detection circuit includes:
Disc antenna detector 100 and signal processing unit 200 for induction field；
The output end of the disc antenna detector 100 connects the input terminal of the signal processing unit 200, the letter
The output end of number processing unit 200 is adapted to monitoring instrument；
The disc antenna detector 100 generates voltage signal after sensing electric field, and the voltage signal is sent
To the signal processing unit 200, the signal processing unit 200 handles the voltage signal, and by treated
Voltage signal is sent to the monitoring instrument.
In practical applications, by disc antenna detector, the power frequency electric field letter of operating transformer surrounding space is detected
Number.There are certain power frequency electric fields around running transformer, between the conductor and conductor of arbitrary shape, between conductor and the earth
Measurement capacitor can be formed, which can be to detect the electric field signal in space.
Disc antenna detector senses high voltage side of transformer electric field signal nearby, and then generates reflection depressor high-pressure side
The sine wave of voltage signal, the phase of the sine wave are equal to the resulting voltage wave data of induction field.
Phase information can be more easily obtained using disc antenna detector, multidisciplinary coordination is avoided and obtains interface
The drawbacks of data.And practicability is stronger, scene, which is carried out the work, only to be needed by arranging that instrument and equipment can start operation, without verifying
With electrical connection and station electricity consumption connection set information, the promotion for improving maintenance department live detection working efficiency has important meaning
Justice.
In one embodiment, referring to fig. 2, Fig. 2 is the schematic diagram of signal processing unit provided by the embodiments of the present application, such as
Shown in figure, the signal processing unit 200 includes:
Signal amplification module 210 and filter module 220；
The first input end of the signal amplification module 210 is the input terminal of the signal processing unit 200, the signal
First output end of amplification module 210 connects the first input end of the filter module 220；
The signal amplification module 210 receives the voltage signal that the sensing unit generates, and to the voltage signal into
Row enhanced processing obtains amplified signal, the amplified signal is sent to the filter module 220, the filter module 220 is right
The amplified signal is filtered to obtain filtering signal, and voltage signal is sent using the filtering signal as treated
To the monitoring instrument.
In practical applications, the voltage signal ability that disc antenna detector measures is smaller, can not directly drive subsequent
Circuit, therefore signal amplification module is used, signal is amplified.
In one embodiment, illustrate referring to the circuit that Fig. 3, Fig. 3 are signal amplification modules provided by the embodiments of the present application
Figure, as shown, the signal amplification module 210 includes:
First resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6,
Seven resistance R7, diode Z1, the first amplifier OP1, the second amplifier OP2, third amplifier OP3 and slide rheostat P1；
The first end of the first resistor R1 is the first input end of the signal amplification module 210, the first resistor
The second end of R1 is separately connected the first input end of the diode Z1 and the positive input terminal of the first amplifier OP1；
The first end of the second resistance R2 is amplified after connecting the second input terminal of the diode Z1 as the signal
Second input terminal of module 210, the second end of the second resistance R2 connect the positive input terminal of the second amplifier OP2；
The first end of the 3rd resistor R3 is separately connected the output end and the 5th resistance of the first amplifier OP1
The first end of R5, the second end of the 3rd resistor R3 are separately connected the first end and described first of the slide rheostat P1
The negative input end of amplifier OP1；
The first end of the 4th resistance R4 is separately connected the second end and second amplification of the slide rheostat P1
The negative input end of device OP2, the second end of the 4th resistance R4 are separately connected the output end of the second amplifier OP2 and described
The first end of 7th resistance R7；
The second end of the 5th resistance R5 be separately connected the 6th resistance R6 first end and the third amplifier
The negative input end of OP3；
The second end of the 6th resistance R6 is amplified after connecting the output end of the third amplifier OP3 as the signal
First output end of module 210；
The second end of the 7th resistance R7 is put after connecting the positive input terminal of the third amplifier OP3 as the signal
The second output terminal of big module 210.
Optionally, the diode Z1 is two-way type transient voltage suppressor diode.
In practical applications, signal amplification circuit need to be designed for demand signals.The voltage signal measured is poor
Sub-signal, signal amplification circuit need to use Differential Input type Enlargement Design mode；It is answered by the spatial impression that space measurement capacitor exports
Signal, signal source impedance is larger, and to avoid short circuit measurement capacitor situation, which should be very big；
For demand signals, three-level amplifier signal amplification circuit is taken.
Optionally, the filter module is Voltage Control Voltage Source type bandpass filtering modules block.
In practical applications, signal is filtered.Because there are each harmonic, low-frequency oscillation and electric power at detection scene
The factors such as carrier wave need to carry out power frequency bandpass filtering treatment to signal to guarantee that the number of being won the confidence exports accurate power frequency electric field amount.
Optionally, the centre frequency of Voltage Control Voltage Source type bandpass filtering modules block is 50Hz, bandwidth 5Hz.
In one embodiment, referring to fig. 4, Fig. 4 is the circuit diagram of filter module provided by the embodiments of the present application, such as
Shown in figure, the Voltage Control Voltage Source bandpass filtering modules block 220 includes:
First filtering submodule 221, second filters submodule 222；
The first input end of the first filtering submodule 221 is the Voltage Control Voltage Source bandpass filtering modules block 220
First input end, it is described first filtering submodule 221 the second input terminal be the Voltage Control Voltage Source bandpass filtering mould
Second input terminal of block 220, the first output end connection of the first filtering submodule 221 second filtering submodule 220
First input end, it is described first filtering submodule 221 second output terminal connect it is described second filtering submodule 222 second
Input terminal, the third output end of the first filtering submodule 221 connect the third input of the second filtering submodule 222
End；
First output end of the second filtering submodule 222 is the Voltage Control Voltage Source bandpass filtering modules block 220
The first output end, it is described second filtering submodule 222 second output terminal be the Voltage Control Voltage Source bandpass filtering mould
The second output terminal of block 220.
Optionally, the first filtering submodule 221 includes:
8th resistance R8, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11, first capacitor C1, the second capacitor
C2 and the 4th amplifier OP4；
The first end of the 8th resistance R8 is the first input end of the first filtering submodule 221, the 8th electricity
The second end of resistance R8 is separately connected the first end of the 9th resistance R9, the first end and described second of the first capacitor C1
Third output end after the first end of capacitor C2 as the first filtering submodule 221；
The second end of the 9th resistance R9 connects after the first end of the eleventh resistor R11 respectively as described first
Filter the second input terminal and second output terminal of submodule 221；
The first end of the tenth resistance R10 be separately connected the first capacitor C1 second end and the 4th amplifier
The first output end after the output end of OP4 as the first filtering submodule 221, the second end point of the tenth resistance R10
The second end of the second capacitor C2 and the negative input end of the 4th amplifier OP4 are not connected；
The second end of the eleventh resistor R11 connects the positive input terminal of the 4th amplifier OP4.
Optionally, the second filtering submodule 222 includes:
Twelfth resistor R12, thirteenth resistor R13, the 14th resistance R14, the 15th resistance R15 and the 5th amplifier
OP5；
The third input terminal that the first end of the twelfth resistor R12 filters submodule 222 for described second, the described tenth
The second end of two resistance R12 is separately connected the first end of the 15th resistance R15 and the output end of the 5th amplifier OP5
The first output end as the second filtering submodule 222 afterwards；
The first input end that the first end of the thirteenth resistor R13 filters submodule 222 for described second, the described tenth
The second end of three resistance R13 is separately connected the second end of the 15th resistance R15 and the negative input of the 5th amplifier OP5
End；
The first end of the 14th resistance R14 is respectively the second input terminal and the institute of the second filtering submodule 222
The second output terminal of the second filtering submodule 222 is stated, the second end of the 14th resistance R14 connects the 5th amplifier
The positive input terminal of OP5.
In practical applications, filtered power frequency electric field voltage signal can be picked directly to monitor, if need to acquire just
The record of sinusoidal voltage data can be realized by being picked after digital filter to computer for string waveform.Although obtaining filtering signal
It is not the actual phase signal in transformer, but the signal can play triggering digital oscilloscope and start acquisition, store data
Effect, in 10 degree or less deviation ranges, can satisfy the reference phase demand of high frequency partial discharge electrification detection, can be used for high frequency and put
Electric spectrum analysis.
The embodiment of the present application provides a kind of detector, the shelf depreciation inspection provided including embodiment in Fig. 1 to Fig. 4 as above
Slowdown monitoring circuit.
The embodiment of the present application answers power frequency electric field from transformer accessory spatial impression using disc antenna detector, so as to
Advantageously obtain the phase information of high voltage side of transformer power-frequency voltage, i.e. voltage signal, using signal processing unit to getting
Voltage signal handled, thus obtain monitor be easy to monitor signal.By above-mentioned detection circuit for partial discharge, effectively
Improve the efficiency of partial discharge of transformer on-line checking.
Embodiment described above is only to illustrate the technical solution of the application, rather than its limitations；Although referring to aforementioned reality
Applying example, invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each
Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features；And these are modified
Or replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution should all
It is included within protection scope of the present invention.
Claims (9)
1. a kind of detection circuit for partial discharge characterized by comprising
Disc antenna detector and signal processing unit for induction field；
The output end of the disc antenna detector connects the input terminal of the signal processing unit, the signal processing unit
Output end be adapted to monitoring instrument；
The disc antenna detector generates voltage signal after sensing electric field, and sends the letter for the voltage signal
Number processing unit, the signal processing unit handle the voltage signal, and will treated that voltage signal is sent to
The monitoring instrument.
2. detection circuit for partial discharge as described in claim 1, which is characterized in that the signal processing unit includes:
Signal amplification module and filter module；
The first input end of the signal amplification module is the input terminal of the signal processing unit, the signal amplification module
First output end connects the first input end of the filter module；
The signal amplification module receives the voltage signal that the sensing unit generates, and amplifies place to the voltage signal
Reason obtains amplified signal, and the amplified signal is sent to the filter module, the filter module to the amplified signal into
Row filtering processing obtains filtering signal, and voltage signal is sent to the monitor using the filtering signal as treated
Device.
3. detection circuit for partial discharge as claimed in claim 2, which is characterized in that the signal amplification module includes:
First resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, diode,
One amplifier, the second amplifier, third amplifier and slide rheostat；
The first end of the first resistor is the first input end of the signal amplification module, the second end point of the first resistor
The first input end of the diode and the positive input terminal of first amplifier are not connected；
The first end of the second resistance connects as the signal amplification module after the second input terminal of the diode
Two input terminals, the second end of the second resistance connect the positive input terminal of second amplifier；
The first end of the 3rd resistor is separately connected the output end of first amplifier and the first end of the 5th resistance,
The second end of the 3rd resistor is separately connected the first end of the slide rheostat and the negative input end of first amplifier；
The first end of 4th resistance be separately connected the slide rheostat second end and second amplifier bear it is defeated
Enter end, the second end of the 4th resistance be separately connected second amplifier output end and the 7th resistance first
End；
The second end of 5th resistance is separately connected the first end of the 6th resistance and the negative input of the third amplifier
End；
The second end of 6th resistance connects as the signal amplification module after the output end of the third amplifier
One output end；
The second end of 7th resistance connects after the positive input terminal of the third amplifier as the signal amplification module
Second output terminal.
4. detection circuit for partial discharge as claimed in claim 3, which is characterized in that the diode is two-way type transient voltage
Inhibit diode.
5. detection circuit for partial discharge as claimed in claim 2, which is characterized in that the filter module is that voltage controls voltage
Source type bandpass filtering modules block.
6. detection circuit for partial discharge as claimed in claim 5, which is characterized in that the Voltage Control Voltage Source bandpass filtering
Module includes:
First filtering submodule, the second filtering submodule；
The first input end of the first filtering submodule is the first input of the Voltage Control Voltage Source bandpass filtering modules block
Second input terminal at end, the first filtering submodule is the second input of the Voltage Control Voltage Source bandpass filtering modules block
End, it is described first filtering submodule the first output end connect it is described second filtering submodule first input end, described first
The second output terminal of filtering submodule connects the second input terminal of the second filtering submodule, the first filtering submodule
Third output end connects the third input terminal of the second filtering submodule；
First output end of the second filtering submodule is the first output of the Voltage Control Voltage Source bandpass filtering modules block
The second output terminal at end, the second filtering submodule is the second output of the Voltage Control Voltage Source bandpass filtering modules block
End.
7. detection circuit for partial discharge as claimed in claim 6, which is characterized in that described first, which filters submodule, includes:
8th resistance, the 9th resistance, the tenth resistance, eleventh resistor, first capacitor, the second capacitor and the 4th amplifier；
The first end of 8th resistance is the first input end of the first filtering submodule, the second end of the 8th resistance
It is separately connected conduct after the first end of the first end of the 9th resistance, the first end of the first capacitor and second capacitor
The third output end of the first filtering submodule；
The second end of 9th resistance connects after the first end of the eleventh resistor respectively as the first filtering submodule
The second input terminal and second output terminal of block；
The first end of tenth resistance is separately connected the second end of the first capacitor and the output end of the 4th amplifier
The first output end as the first filtering submodule, the second end of the tenth resistance are separately connected second capacitor afterwards
Second end and the 4th amplifier negative input end；
The second end of the eleventh resistor connects the positive input terminal of the 4th amplifier.
8. detection circuit for partial discharge as claimed in claim 6, which is characterized in that described second, which filters submodule, includes:
Twelfth resistor, thirteenth resistor, the 14th resistance, the 15th resistance and the 5th amplifier；
The first end of the twelfth resistor is the third input terminal of the second filtering submodule, the of the twelfth resistor
Two ends are separately connected after the first end of the 15th resistance and the output end of the 5th amplifier as second filtering
First output end of submodule；
The first end of the thirteenth resistor is the first input end of the second filtering submodule, the of the thirteenth resistor
Two ends are separately connected the second end of the 15th resistance and the negative input end of the 5th amplifier；
The first end of 14th resistance is respectively that the second input terminal and described second of the second filtering submodule filters
The second end of the second output terminal of submodule, the 14th resistance connects the positive input terminal of the 5th amplifier.
9. a kind of detector characterized by comprising detection circuit for partial discharge as claimed in any one of claims 1 to 8.
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| CN201811264914.3A CN109100625A (en) | 2018-10-29 | 2018-10-29 | A kind of detection circuit for partial discharge and detector |
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| CN201811264914.3A CN109100625A (en) | 2018-10-29 | 2018-10-29 | A kind of detection circuit for partial discharge and detector |
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Application publication date: 20181228 |