CN104007370A - Sensor and method used for monitoring partial discharge of cable - Google Patents
Sensor and method used for monitoring partial discharge of cable Download PDFInfo
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- CN104007370A CN104007370A CN201410199950.1A CN201410199950A CN104007370A CN 104007370 A CN104007370 A CN 104007370A CN 201410199950 A CN201410199950 A CN 201410199950A CN 104007370 A CN104007370 A CN 104007370A
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Abstract
The embodiment of the invention discloses a sensor used for monitoring the partial discharge of a cable and a method. The sensor comprises a power module, a high-frequency magnetic core winding, an integral circuit module, an ultrahigh impedance pre-amplification circuit module, a shaping circuit module, a light emitter drive circuit module and a light emitter module, wherein the high-frequency magnetic core winding, the integral circuit module, the ultrahigh impedance pre-amplification circuit module, the shaping circuit module, the light emitter drive circuit module and the light emitter module are connected in sequence. The power module is connected with the voltage input end of the ultrahigh impedance pre-amplification circuit module, the voltage input end of the shaping circuit module, the voltage input end of the light emitter drive circuit module and the voltage input end of the light emitter module and used for providing direct-current voltage. For every two adjacent modules of the four modules sequentially connected, the signal output end of the former module is connected with the signal input end of the next module, and used for inducing partial discharge signals, carrying out front end primary processing on the obtained discharge signals, and converting the discharge signals into light signals to be sent out. According to the sensor, the signals can be transmitted at a long distance, signal attenuation can be lowered, the insulation state of the cable can be obtained fast and accurately, and the purposes of finding internal insulation defects in time and carrying out treatment can be achieved.
Description
Technical field
The present invention relates to power system monitoring technical field, relate in particular to a kind of sensor for monitoring cable shelf depreciation and method.
Background technology
Along with the development of urban distribution network and the needs of transformation and upgrade, the use amount of power cable line rises just year by year, and particularly high voltage power cable obtains a wide range of applications, and the amount of laying cumulative year after year.The fact shows that power cable line fault is to cause power grid accident, causes the major reason of heavy economic losses, therefore accurately also grasps in time the running status of cable line, to reasonable handling failure hidden danger, ensures that power grid operation has great importance.
Current, high voltage power cable shelf depreciation is to cause the main cause of power cable body insulation degradation, engineering technical personnel can obtain the insulation status of high voltage power cable in advance by partial discharge test, find in time built-in electrical insulation defect and process.In the universal method of partial discharge test, pulse current detection method is highly sensitive owing to having, and is therefore widely used.The method adopts and extracts signal from high voltage power cable ground wire or cross interconnected case, by concentric cable, pulse voltage signal is passed to surveying instrument and carry out the processing such as filtering, amplification and demonstration, thereby determine the source position of power cable shelf depreciation, its shortcoming is: while adopting concentric cable signal transmission, its transmission range limited and in transmitting procedure signal attenuation serious, be not especially suitable for distant signal transmission.
Summary of the invention
Technical matters to be solved by this invention be to provide a kind of based on Optical Fiber Transmission sensor and the method for monitoring cable shelf depreciation, distant signal transmission can be provided, and can reduce the decay of signal in transmitting procedure, thereby reach the insulation status that obtains fast and accurately high voltage power cable, and find in time the object that built-in electrical insulation defect is processed.
In order to solve the problems of the technologies described above, the embodiment of the present invention provides a kind of sensor for monitoring cable shelf depreciation, comprises power module, high frequency magnetic core coiling and integrating circuit module, ultra-high-impedance pre-amplification circuit module, shaping circuit module, optical transmitting set drive circuit module and optical transmitter module; Wherein,
Described power module, its output terminal is connected with the voltage input end of described ultra-high-impedance pre-amplification circuit module, the voltage input end of shaping circuit module, the voltage input end of optical transmitting set drive circuit module and the voltage input end of optical transmitter module respectively, for DC voltage is provided;
Described high frequency magnetic core coiling and integrating circuit module, its signal output part is connected with the signal input part of described ultra-high-impedance pre-amplification circuit module, be used for obtaining cable local discharge signal, and by the discharge signal of described acquisition after RC integrating circuit is processed, obtain discharge process signal;
Described ultra-high-impedance pre-amplification circuit module, its signal output part is connected with the signal input part of described shaping circuit module, for the voltage of the described discharge process signal obtaining is amplified to after the first default voltage threshold, obtain the discharge process signal after amplifying;
Described shaping circuit module, its signal output part is connected with the signal input part of described optical transmitting set drive circuit module, for the discharge process signal after the amplification of described acquisition is carried out after RC filtering processing, compare with default second voltage threshold value, obtain shaping amplifying signal;
Described optical transmitting set drive circuit module, its signal output part is connected with the signal input part of described optical transmitter module, for the shaping amplifying signal of described generation is exported to described optical transmitter module, and provide the required drive current of described optical transmitter module and driving voltage;
Described optical transmitter module, for converting described shaping amplifying signal to light signal, and exports described light signal according to default wavelength value.
Wherein, described high frequency magnetic core coiling and integrating circuit module comprise by high frequency magnetic core around thread inductance and RC integrating circuit; Wherein,
Described inductance, its signal output part is connected with the signal input part of described RC integrating circuit, for obtaining described cable local discharge signal;
Described RC integrating circuit, its signal output part is connected with the signal input part of described ultra-high-impedance pre-amplification circuit module, for the treatment of the discharge signal of described acquisition, and obtains described discharge process signal.
Wherein, the frequency span of described cable local discharge signal is between 100kHz to 100MHz.
Wherein, described shaping circuit module comprises RC filtering circuit and comparer; Wherein,
Described RC filtering circuit, its signal input part is connected with the signal output part of described shaping circuit module, and its signal output part is connected with the input end of described comparer, for the discharge process signal after the amplification of described acquisition is carried out to RC filtering processing;
Described comparer, its output terminal is connected with the signal input part of described optical transmitting set drive circuit module, after described discharge process signal after RC filtering is processed and default second voltage threshold value are compared, obtains reshaping signal.
Wherein, described default second voltage threshold value is the output voltage that a three terminal regulator produces.
Wherein, described default wavelength value is 1310 nanometers.
The embodiment of the present invention also provides a kind of method for monitoring cable shelf depreciation, and it is realized in described sensor in the above, and described method comprises:
Obtain cable local discharge signal, and by the discharge signal of described acquisition after RC integrating circuit is processed, obtain discharge process signal;
The voltage amplification of the described discharge process signal obtaining, to the first default voltage threshold, is obtained to the discharge process signal after amplifying;
Discharge process signal after the amplification of described acquisition, after RC filtering circuit is processed, is compared with default second voltage threshold value, obtain shaping amplifying signal; And
Convert the described shaping amplifying signal obtaining to light signal, and according to default wavelength value, described light signal is exported.
Wherein, described default second voltage threshold value is the output voltage that a three terminal regulator produces.
Wherein, described default wavelength value is 1310 nanometers.
Wherein, the frequency span of described cable local discharge signal is between 100kHz to 100MHz.
Implement the embodiment of the present invention, there is following beneficial effect:
The embodiment of the present invention is used for monitoring cable shelf depreciation based on Optical Fiber Transmission, distant signal transmission can be provided, and can reduce the decay of signal in transmitting procedure, thereby reach the insulation status that obtains fast and accurately high voltage power cable, and find in time the object that built-in electrical insulation defect is processed.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, the accompanying drawing that obtains other according to these accompanying drawings still belongs to category of the present invention.
The connection diagram of the sensor for monitoring cable shelf depreciation that Fig. 1 provides for the embodiment of the present invention one;
Fig. 2 is the connection diagram of the coiling of Fig. 1 medium-high frequency magnetic core and integrating circuit module;
Fig. 3 is the connection diagram of shaping circuit module in Fig. 1;
The application scenarios schematic diagram of the sensor for monitoring cable shelf depreciation that Fig. 4 provides for the embodiment of the present invention one;
The process flow diagram of the method for monitoring cable shelf depreciation that Fig. 5 provides for the embodiment of the present invention two.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, in the embodiment of the present invention one, propose a kind of sensor for monitoring cable shelf depreciation, comprise power module, high frequency magnetic core coiling and integrating circuit module, ultra-high-impedance pre-amplification circuit module, shaping circuit module, optical transmitting set drive circuit module and optical transmitter module; Wherein,
Power module, its output terminal is connected with the voltage input end of ultra-high-impedance pre-amplification circuit module, the voltage input end of shaping circuit module, the voltage input end of optical transmitting set drive circuit module and the voltage input end of optical transmitter module respectively, for providing galvanic current to press;
High frequency magnetic core coiling and integrating circuit module, its signal output part is connected with the signal input part of ultra-high-impedance pre-amplification circuit module, be used for obtaining cable local discharge signal, and by the discharge signal obtaining after RC integrating circuit is processed, obtain discharge process signal;
Ultra-high-impedance pre-amplification circuit module, its signal output part is connected with the signal input part of described shaping circuit module, for the voltage of the discharge process signal obtaining is amplified to after the first default voltage threshold, obtains the discharge process signal after amplifying;
Shaping circuit module, its signal output part is connected with the signal input part of optical transmitting set drive circuit module, for the discharge process signal after the amplification of acquisition is carried out after RC filtering processing, compare with default second voltage threshold value, obtain shaping amplifying signal;
Optical transmitting set drive circuit module, its signal output part is connected with the signal input part of optical transmitter module, for the shaping amplifying signal of generation is exported to optical transmitter module, and provides the required drive current of optical transmitter module and driving voltage;
Optical transmitter module, for converting shaping amplifying signal to light signal, and exports light signal according to default wavelength value.
In actual application, sensor designs for upper opening, shell is used insulating material to make, its high frequency magnetic core coiling and integrating circuit module are arranged on the upper part in this sensor, and power module, ultra-high-impedance pre-amplification circuit module, shaping circuit module, optical transmitting set drive circuit module and optical transmitter module are integrated in the lower part in this sensor.
Further, as shown in Figure 2, high frequency magnetic core coiling and integrating circuit module comprise inductance and RC integrating circuit; Wherein,
Inductance, its signal output part is connected with the signal input part of RC integrating circuit, be used for obtaining cable local discharge signal, this inductance is made by specific high frequency magnetic core coiling, can be coupled out the discharge signal (as high-frequency signal) that cable local discharge produces, this discharge signal, by coiling fixing on inductance, is exported acquired discharge signal by fixed proportion, and the frequency span of this cable local discharge signal (discharge signal obtaining) is between 100kHz to 100MHz;
RC integrating circuit, its signal output part is connected with the signal input part of ultra-high-impedance pre-amplification circuit module, and the discharge signal for the treatment of obtaining, carries out preliminary distortion by this discharge signal, thereby obtains discharge process signal.
Further, as shown in Figure 3, shaping circuit module comprises RC filtering circuit and comparer; Wherein,
RC filtering circuit, its signal input part is connected with the signal output part of shaping circuit module, and its signal output part is connected with the input end of comparer, for the discharge process signal after the amplification of acquisition is carried out to RC filtering processing;
Comparer, its output terminal is connected with the signal input part of optical transmitting set drive circuit module, after the discharge process signal after RC filtering is processed and default second voltage threshold value are compared, obtains reshaping signal.
Should be noted that, RC integrating circuit and RC filtering circuit, designer can be according to the flexible design that needs of self, they the two difference is: RC integrating circuit is the integral action while utilizing capacitor charging, according to input waveform, produce corresponding periodicity output waveform, as rectangular wave pulse (square wave) is converted to sawtooth wave or triangular wave, also sawtooth wave can be converted to parabolic shape, and RC filtering circuit is that the signal of upper frequency is bypassed, the value of electric capacity is according to the numerical value setting of required filtration Frequency point.
Further, default second voltage threshold value is the output voltage that a three terminal regulator produces.
Further, default wavelength value is 1310 nanometers.
As shown in Figure 4, the application scenarios for the sensor of monitoring cable shelf depreciation in inventive embodiments one is further illustrated:
Sensor can be arranged on cross interconnected case, protective ground case, direct grounding box; the general three-phase sensor that adopts; each phase sensor is all fixed on each steel bar of going up mutually of above-mentioned ground connection casing, and guarantees that this three-phase installation of sensors keeps direction, position consistency.
Now, cross interconnected case, protective ground case, directly the side of grounding box is all provided with the optic fibre switching seat of waterproof, power supply transfer seat, the fiber-optic wire of three-phase sensor is connected to the optic fibre switching seat on corresponding casing, and the power supply lead wire of three-phase sensor is connected on the power supply transfer seat on corresponding casing, pass through respectively connected optic fibre switching seat and power supply transfer seat, dock with optical fiber and power lead outside casing, and be connected to integrated data processing platform, making this integrated data processing platform can be the unified power supply of each sensor, and receive the cable local discharge data of each sensor transmission and process received data.
Therefore, each sensor all can be by being fixed on the discharge signal in the closed magnetic circuit induction respective cable on steel bar, and then the discharge signal obtaining is carried out front end rough handling and is converted to light signal, be finally sent to integrated data processing platform and carry out rear class processing, differentiation and show output differentiation result.
As shown in Figure 5, in the embodiment of the present invention two, propose a kind of method for monitoring cable shelf depreciation, described method comprises:
Step S101, obtain cable local discharge signal, and by the discharge signal of described acquisition after RC integrating circuit is processed, obtain discharge process signal;
Step S102, by the voltage amplification of the described discharge process signal obtaining to the first default voltage threshold, obtain the discharge process signal after amplifying;
Step S103, by the discharge process signal after the amplification of described acquisition after RC filtering circuit is processed, compare with default second voltage threshold value, obtain shaping amplifying signal;
Step S104, convert the described shaping amplifying signal obtaining to light signal, and according to default wavelength value, described light signal is exported.
Wherein, default second voltage threshold value is the output voltage that a three terminal regulator produces.
Wherein, default wavelength value is 1310 nanometers.
Wherein, the frequency span of cable local discharge signal is between 100kHz to 100MHz.
Implement the embodiment of the present invention, there is following beneficial effect:
The embodiment of the present invention is used for monitoring cable shelf depreciation based on Optical Fiber Transmission, distant signal transmission can be provided, and can reduce the decay of signal in transmitting procedure, thereby reach the insulation status that obtains fast and accurately high voltage power cable, and find in time the object that built-in electrical insulation defect is processed.
One of ordinary skill in the art will appreciate that all or part of step realizing in above-described embodiment method is to come the hardware that instruction is relevant to complete by program, described program can be stored in a computer read/write memory medium, described storage medium, as ROM/RAM, disk, CD etc.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. the sensor for monitoring cable shelf depreciation, it is characterized in that, comprise power module, high frequency magnetic core coiling and integrating circuit module, ultra-high-impedance pre-amplification circuit module, shaping circuit module, optical transmitting set drive circuit module and optical transmitter module; Wherein,
Described power module, its output terminal is connected with the voltage input end of described ultra-high-impedance pre-amplification circuit module, the voltage input end of shaping circuit module, the voltage input end of optical transmitting set drive circuit module and the voltage input end of optical transmitter module respectively, for DC voltage is provided;
Described high frequency magnetic core coiling and integrating circuit module, its signal output part is connected with the signal input part of described ultra-high-impedance pre-amplification circuit module, be used for obtaining cable local discharge signal, and by the discharge signal of described acquisition after RC integrating circuit is processed, obtain discharge process signal;
Described ultra-high-impedance pre-amplification circuit module, its signal output part is connected with the signal input part of described shaping circuit module, for the voltage of the described discharge process signal obtaining is amplified to after the first default voltage threshold, obtain the discharge process signal after amplifying;
Described shaping circuit module, its signal output part is connected with the signal input part of described optical transmitting set drive circuit module, for the discharge process signal after the amplification of described acquisition is carried out after RC filtering processing, compare with default second voltage threshold value, obtain shaping amplifying signal;
Described optical transmitting set drive circuit module, its signal output part is connected with the signal input part of described optical transmitter module, for the shaping amplifying signal of described generation is exported to described optical transmitter module, and provide the required drive current of described optical transmitter module and driving voltage;
Described optical transmitter module, for converting described shaping amplifying signal to light signal, and exports described light signal according to default wavelength value.
2. sensor as claimed in claim 1, is characterized in that, described high frequency magnetic core coiling and integrating circuit module comprise by high frequency magnetic core around thread inductance and RC integrating circuit; Wherein,
Described inductance, its signal output part is connected with the signal input part of described RC integrating circuit, for obtaining described cable local discharge signal;
Described RC integrating circuit, its signal output part is connected with the signal input part of described ultra-high-impedance pre-amplification circuit module, for the treatment of the discharge signal of described acquisition, and obtains described discharge process signal.
3. sensor as claimed in claim 2, is characterized in that, the frequency span of described cable local discharge signal is between 100kHz to 100MHz.
4. sensor as claimed in claim 1, is characterized in that, described shaping circuit module comprises RC filtering circuit and comparer; Wherein,
Described RC filtering circuit, its signal input part is connected with the signal output part of described shaping circuit module, and its signal output part is connected with the input end of described comparer, for the discharge process signal after the amplification of described acquisition is carried out to RC filtering processing;
Described comparer, its output terminal is connected with the signal input part of described optical transmitting set drive circuit module, after described discharge process signal after RC filtering is processed and default second voltage threshold value are compared, obtains reshaping signal.
5. the sensor as described in claim 1 or 4, is characterized in that, described default second voltage threshold value is the output voltage that a three terminal regulator produces.
6. sensor as claimed in claim 1, is characterized in that, described default wavelength value is 1310 nanometers.
7. for a method for monitoring cable shelf depreciation, it is characterized in that, it realizes in the sensor as described in any one in claim 1 to 6, and described method comprises:
Obtain cable local discharge signal, and by the discharge signal of described acquisition after RC integrating circuit is processed, obtain discharge process signal;
The voltage amplification of the described discharge process signal obtaining, to the first default voltage threshold, is obtained to the discharge process signal after amplifying;
Discharge process signal after the amplification of described acquisition, after RC filtering circuit is processed, is compared with default second voltage threshold value, obtain shaping amplifying signal; And
Convert the described shaping amplifying signal obtaining to light signal, and according to default wavelength value, described light signal is exported.
8. method as claimed in claim 7, is characterized in that, described default second voltage threshold value is the output voltage that a three terminal regulator produces.
9. method as claimed in claim 7, is characterized in that, described default wavelength value is 1310 nanometers.
10. method as claimed in claim 7, is characterized in that, the frequency span of described cable local discharge signal is between 100kHz to 100MHz.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410199950.1A CN104007370A (en) | 2014-05-13 | 2014-05-13 | Sensor and method used for monitoring partial discharge of cable |
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| CN201410199950.1A CN104007370A (en) | 2014-05-13 | 2014-05-13 | Sensor and method used for monitoring partial discharge of cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114280432A (en) * | 2021-11-24 | 2022-04-05 | 浙江新图维电子科技有限公司 | Cable partial discharge monitoring equipment and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114280432A (en) * | 2021-11-24 | 2022-04-05 | 浙江新图维电子科技有限公司 | Cable partial discharge monitoring equipment and method |
| CN114280432B (en) * | 2021-11-24 | 2023-10-13 | 浙江新图维电子科技有限公司 | Cable partial discharge monitoring equipment and method |
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