CN212989542U - Transformer partial discharge on-line measuring system - Google Patents
Transformer partial discharge on-line measuring system Download PDFInfo
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- CN212989542U CN212989542U CN202021331552.8U CN202021331552U CN212989542U CN 212989542 U CN212989542 U CN 212989542U CN 202021331552 U CN202021331552 U CN 202021331552U CN 212989542 U CN212989542 U CN 212989542U
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Abstract
The utility model provides an online detection system for partial discharge of a transformer, which can filter electrical interference, such as corona interference, in the running environment of the transformer by arranging a band-pass filter, effectively avoid the corona interference on site and improve the anti-interference capability; by arranging the band elimination filter, radio interference of mobile phone communication and the like can be filtered, and the anti-interference capability is improved; by arranging the differential amplification circuit, the noise can be reduced, and the detection precision can be improved; the ultrahigh frequency is adopted to detect partial discharge, and the attenuation of an ultrahigh frequency signal is small during propagation, so that the sensitivity of the whole system is high; the corona interference on site can be effectively avoided, and the anti-interference capability is higher; because the ultrahigh frequency sensor collects electromagnetic waves, online partial discharge detection can be realized under the condition of disconnecting a power supply.
Description
Technical Field
The utility model relates to a partial discharge technical field especially relates to a transformer partial discharge on-line measuring system.
Background
Partial discharge is a great safety hazard in power operation, is an important sign of cable insulation degradation, and is also one of important reasons for insulation aging. At present, the local discharge field detection methods developed at home and abroad mainly include: PD detection under power frequency sine wave voltage, PD detection under ultralow frequency voltage and PD detection under damped oscillation voltage (DAC for short). Among them, the transformer plays an important role in the above three detection methods. When the transformer oil is deteriorated due to an excessively high temperature or an excessively long use time, bubbles are generated in the transformer oil due to the cracking of the oil. If bubbles are generated, partial discharge of the transformer may occur even under low voltage. Partial discharge of a transformer is a main cause of damage to an insulation system of power equipment and power failure, so that effective detection of partial discharge of the transformer is a necessary measure for ensuring safe and reliable operation of the power system.
The currently common partial discharge detection method is a pulse current method, and the pulse current method has the advantages of high off-line measurement sensitivity and capability of quantitatively measuring partial discharge; the disadvantage is that the device is easily interfered by electromagnetic field of operation equipment and can not be detected in a charged state. Therefore, in order to solve the above problem, the utility model provides a transformer partial discharge on-line measuring system can effectively avoid on-the-spot corona to disturb, has higher interference killing feature to realize online partial discharge and detect.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a transformer partial discharge on-line measuring system can effectively avoid on-the-spot corona to disturb, has higher interference killing feature to realize online partial discharge and detect.
The technical scheme of the utility model is realized like this: the utility model provides a transformer partial discharge on-line measuring system, it includes superfrequency sensor, signal processing unit and treater, the signal processing unit includes band-pass filter, band elimination filter and amplifier circuit;
the ultrahigh frequency sensor is electrically connected with the analog input end of the processor through a band-pass filter, a band-stop filter and an amplifying circuit which are sequentially connected in series.
Based on the above technical solution, preferably, the band pass filter is a 7 th order chebyshev band pass filter.
Further preferably, the band pass filter includes: capacitors C37-C43 and inductors L3-L9;
the ultrahigh frequency sensor, the inductor L3, the capacitor C37, the inductor L6, the capacitor C40, the inductor L7, the capacitor C41, the inductor L9, the capacitor C43 and the input end of the band elimination filter are sequentially connected in series;
one end of the capacitor C38 is electrically connected with the middle connection point of the capacitor C37 and the inductor L6, the other end of the capacitor C38 is grounded, and the inductor L4 is connected in parallel with the two ends of the capacitor C38;
one end of the capacitor C39 is electrically connected with the middle connection point of the capacitor C40 and the inductor L7, the other end of the capacitor C39 is grounded, and the inductor L5 is connected in parallel with the two ends of the capacitor C39;
one end of the capacitor C42 is electrically connected to the middle connection point between the capacitor C41 and the inductor L9, the other end of the capacitor C42 is grounded, and the inductor L8 is connected in parallel to the two ends of the capacitor C42.
On the basis of the above technical solution, preferably, the band-stop filter is a 5 th order chebyshev band-pass filter.
Further preferably, the band-stop filter includes: capacitors C44-C48 and inductors L10-L14;
the output end of the band-pass filter, the inductor L10, the inductor L13, the inductor L14 and the input end of the amplifying circuit are electrically connected in sequence, the capacitor C44 is connected in parallel at two ends of the inductor L10, the capacitor C47 is connected in parallel at two ends of the inductor L13, and the capacitor C48 is connected in parallel at two ends of the inductor L14;
one end of the inductor L11 is electrically connected with the middle connection point of the inductor L10 and the inductor L13, and the other end of the inductor L11 is grounded through the capacitor C45;
one end of the inductor L12 is electrically connected to the middle connection point between the inductor L13 and the inductor L14, and the other end of the inductor L12 is grounded through the capacitor C48.
On the basis of the above technical solution, preferably, the amplifying circuit includes an amplifier and a differential amplifying circuit;
the band elimination filter is electrically connected with the analog input end of the processor through the amplifier and the differential amplification circuit which are connected in sequence.
Further preferably, the amplifier comprises: an ADL5441 operational amplification chip;
the output end of the band elimination filter is electrically connected with the RFin pin of the ADL5441 operational amplification chip, and the RFout pin of the ADL5441 operational amplification chip is electrically connected with the single-ended input end of the differential amplification circuit.
Further preferably, the differential amplifier circuit includes: an AD8131 operational amplification chip;
the RFout pin of the ADL5441 operational amplification chip is electrically connected with the Vi + pin of the AD8131 operational amplification chip, the Vi-pin of the AD8131 operational amplification chip is grounded, and the Vo + pin and the Vo-pin are respectively electrically connected with the analog input end of the processor.
The utility model discloses a transformer partial discharge on-line measuring system has following beneficial effect for prior art:
(1) by arranging the band-pass filter, the electric interference, such as corona interference, in the running environment of the transformer can be filtered, the field corona interference is effectively avoided, and the anti-interference capability is improved;
(2) by arranging the band elimination filter, radio interference of mobile phone communication and the like can be filtered, and the anti-interference capability is improved;
(3) by arranging the differential amplification circuit, the noise can be reduced, and the detection precision can be improved;
(4) the ultrahigh frequency is adopted to detect partial discharge, and the attenuation of an ultrahigh frequency signal is small during propagation, so that the sensitivity of the whole system is high; the corona interference on site can be effectively avoided, and the anti-interference capability is higher; because the ultrahigh frequency sensor collects electromagnetic waves, online partial discharge detection can be realized under the condition of disconnecting a power supply.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a structural diagram of the transformer partial discharge on-line detection system of the present invention;
fig. 2 is a circuit diagram of a band-pass filter in the transformer partial discharge online detection system of the present invention;
fig. 3 is a circuit diagram of a band stop filter in the transformer partial discharge online detection system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
According to the common knowledge in the field, the partial discharge process of the medium has positive and negative charge neutralization, the neutralization process is generated by a very steep current pulse, and electromagnetic waves with high frequency can be radiated, and the ultrahigh frequency component is generally between 300MHz and 3 GHz. Because the electric field intensity of the transformer oil paper insulation is very high, very strong electromagnetic waves can be radiated when partial discharge occurs, and the ultrahigh frequency detection method is to detect by using the characteristic of the partial discharge to obtain the related information of the partial discharge. But because the electrical interference among the transformer operational environment is more, for example corona interference, its frequency is mainly below 300MHz to adopt the unable on-line measuring of pulse current method, consequently, in order to effectively avoid on-the-spot corona interference, improve the interference killing feature, and realize on-line measuring, as shown in fig. 1, the utility model discloses a transformer partial discharge on-line measuring system, it includes superfrequency sensor, signal processing unit and treater.
The ultrahigh frequency sensor is used for detecting electromagnetic waves generated when the transformer is partially discharged. In this embodiment, the existing sensor can be used as the uhf sensor, and this embodiment does not involve an improvement in the structure of the uhf sensor, and therefore, a description thereof will not be repeated here.
The signal processing unit is very weak in partial discharge signal, and various electromagnetic waves and sound wave noises are numerous on the running site of the transformer, so that the signal obtained by the ultrahigh frequency sensor is very weak and carries various noise signals. Therefore, it is necessary to design a signal processing unit to filter and amplify the signal obtained by the uhf sensor. In this embodiment, the signal processing unit includes a band pass filter, a band stop filter, and an amplifying circuit. The ultrahigh frequency sensor is electrically connected with the analog input end of the processor through a band-pass filter, a band-stop filter and an amplifying circuit which are sequentially connected in series.
The band-pass filter is arranged in the embodiment and used for filtering radio interference such as mobile phone communication and the like and field electrical interference because the ultrahigh frequency sensor has a very wide detection range on ultrahigh frequency signals. Preferably, in this embodiment, the band pass filter is a 7 th-order chebyshev band pass filter. Specifically, as shown in fig. 2, the band pass filter includes: capacitors C37-C43 and inductors L3-L9; the ultrahigh frequency sensor, the inductor L3, the capacitor C37, the inductor L6, the capacitor C40, the inductor L7, the capacitor C41, the inductor L9, the capacitor C43 and the input end of the band elimination filter are sequentially connected in series; one end of the capacitor C38 is electrically connected with the middle connection point of the capacitor C37 and the inductor L6, the other end of the capacitor C38 is grounded, and the inductor L4 is connected in parallel with the two ends of the capacitor C38; one end of the capacitor C39 is electrically connected with the middle connection point of the capacitor C40 and the inductor L7, the other end of the capacitor C39 is grounded, and the inductor L5 is connected in parallel with the two ends of the capacitor C39; one end of the capacitor C42 is electrically connected to the middle connection point between the capacitor C41 and the inductor L9, the other end of the capacitor C42 is grounded, and the inductor L8 is connected in parallel to the two ends of the capacitor C42. In this embodiment, the band pass filter allows signals with frequencies between 300MHz and 3GHz to pass through, and suppresses signals, interference, and noise below or above the frequency band.
The band-elimination filter is used for inhibiting signals in a radio frequency band of the mobile phone and allowing signals outside the radio frequency band to pass through. In this embodiment, the band-stop filter is a 5-order chebyshev band-pass filter. Specifically, as shown in fig. 3, the output end of the band-pass filter, the inductor L10, the inductor L13, the inductor L14, and the input end of the amplifying circuit are electrically connected in sequence, the capacitor C44 is connected in parallel to both ends of the inductor L10, the capacitor C47 is connected in parallel to both ends of the inductor L13, and the capacitor C48 is connected in parallel to both ends of the inductor L14; one end of the inductor L11 is electrically connected with the middle connection point of the inductor L10 and the inductor L13, and the other end of the inductor L11 is grounded through the capacitor C45; one end of the inductor L12 is electrically connected to the middle connection point between the inductor L13 and the inductor L14, and the other end of the inductor L12 is grounded through the capacitor C48.
And the amplifying circuit is used for amplifying and filtering the signal output by the band stop filter. In this embodiment, the amplifying circuit includes: an amplifier and a differential amplification circuit; specifically, the band elimination filter is electrically connected with the analog input end of the processor through an amplifier and a differential amplification circuit which are connected in sequence.
And the amplifier is used for amplifying the signal output by the band-stop filter. In this embodiment, the structure of the amplifier is not limited, and an amplifier commonly used in the art may be used to implement the amplification function. Preferably, the amplifier of the present embodiment includes: an ADL5441 operational amplification chip; the output end of the band elimination filter is electrically connected with the RFin pin of the ADL5441 operational amplification chip, and the RFout pin of the ADL5441 operational amplification chip is electrically connected with the single-ended input end of the differential amplification circuit. Since the peripheral circuit of the ADL5441 operational amplifier chip belongs to the prior art, and the present embodiment does not involve the improvement of the peripheral circuit thereof, a description thereof will not be repeated here.
A differential amplifier circuit reduces noise and improves detection accuracy. In this embodiment, the structure of the differential amplifier circuit is not limited, and the differential amplifier circuit commonly used in the art may be used to implement the amplification function. Preferably, the differential amplifier circuit of the present embodiment includes: an AD8131 operational amplification chip; specifically, an RFout pin of the ADL5441 operational amplification chip is electrically connected with a Vi + pin of the AD8131 operational amplification chip, a Vi-pin of the AD8131 operational amplification chip is grounded, and a Vo + pin and a Vo-pin are respectively electrically connected with an analog input end of the processor.
The working principle of the embodiment is as follows: the ultrahigh frequency sensor detects electromagnetic waves generated during partial discharge and outputs signals to the band-pass filter for filtering, signals with frequency bands falling within the range of 300 MHz-3 GHz pass through the band-pass filter, signals with frequency bands falling within the range of the frequency band of the mobile phone do not pass through the band-stop filter, and signals outside the frequency band pass through the band-stop filter, pass through the amplifier and the differential amplification circuit and then reach the processor.
The beneficial effect of this embodiment does: by arranging the band-pass filter, the electric interference, such as corona interference, in the running environment of the transformer can be filtered, the field corona interference is effectively avoided, and the anti-interference capability is improved;
by arranging the band elimination filter, radio interference of mobile phone communication and the like can be filtered, and the anti-interference capability is improved;
by arranging the differential amplification circuit, the noise can be reduced, and the detection precision can be improved;
the ultrahigh frequency is adopted to detect partial discharge, and the attenuation of an ultrahigh frequency signal is small during propagation, so that the sensitivity of the whole system is high; the corona interference on site can be effectively avoided, and the anti-interference capability is higher; because the ultrahigh frequency sensor collects electromagnetic waves, online partial discharge detection can be realized under the condition of disconnecting a power supply.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a transformer partial discharge on-line measuring system, its includes superfrequency sensor, signal processing unit and treater, its characterized in that: the signal processing unit comprises a band-pass filter, a band-stop filter and an amplifying circuit;
the ultrahigh frequency sensor is electrically connected with the analog input end of the processor through a band-pass filter, a band elimination filter and an amplifying circuit which are sequentially connected in series.
2. The on-line detection system for partial discharge of transformer as claimed in claim 1, wherein: the band-pass filter is a 7-order Chebyshev band-pass filter.
3. The on-line detection system for partial discharge of transformer as claimed in claim 2, wherein: the band pass filter includes: capacitors C37-C43 and inductors L3-L9;
the ultrahigh frequency sensor, the inductor L3, the capacitor C37, the inductor L6, the capacitor C40, the inductor L7, the capacitor C41, the inductor L9, the capacitor C43 and the input end of the band elimination filter are sequentially connected in series;
one end of the capacitor C38 is electrically connected with the middle connection point of the capacitor C37 and the inductor L6, the other end of the capacitor C38 is grounded, and the inductor L4 is connected in parallel with the two ends of the capacitor C38;
one end of the capacitor C39 is electrically connected with the middle connection point of the capacitor C40 and the inductor L7, the other end of the capacitor C39 is grounded, and the inductor L5 is connected in parallel with the two ends of the capacitor C39;
one end of the capacitor C42 is electrically connected with the middle connection point of the capacitor C41 and the inductor L9, the other end of the capacitor C42 is grounded, and the inductor L8 is connected in parallel with two ends of the capacitor C42.
4. The on-line detection system for partial discharge of transformer as claimed in claim 1, wherein: the band elimination filter is a 5-order Chebyshev band-pass filter.
5. The on-line detection system for partial discharge of transformer as claimed in claim 4, wherein: the band-stop filter includes: capacitors C44-C48 and inductors L10-L14;
the output end of the band-pass filter, the inductor L10, the inductor L13, the inductor L14 and the input end of the amplifying circuit are electrically connected in sequence, the capacitor C44 is connected to two ends of the inductor L10 in parallel, the capacitor C47 is connected to two ends of the inductor L13 in parallel, and the capacitor C48 is connected to two ends of the inductor L14 in parallel;
one end of the inductor L11 is electrically connected with the middle connection point of the inductor L10 and the inductor L13, and the other end of the inductor L11 is grounded through the capacitor C45;
one end of the inductor L12 is electrically connected with the middle connection point of the inductor L13 and the inductor L14, and the other end of the inductor L12 is grounded through the capacitor C48.
6. The on-line detection system for partial discharge of transformer as claimed in claim 1, wherein: the amplifying circuit comprises an amplifier and a differential amplifying circuit;
the band elimination filter is electrically connected with the analog input end of the processor through the amplifier and the differential amplification circuit which are connected in sequence.
7. The on-line detection system for partial discharge of transformer as claimed in claim 6, wherein: the amplifier includes: an ADL5441 operational amplification chip;
the output end of the band elimination filter is electrically connected with an RFin pin of the ADL5441 operational amplification chip, and an RFout pin of the ADL5441 operational amplification chip is electrically connected with a single-ended input end of the differential amplification circuit.
8. The on-line detection system for partial discharge of transformer of claim 7, wherein: the differential amplification circuit includes: an AD8131 operational amplification chip;
the RFout pin of the ADL5441 operational amplification chip is electrically connected with the Vi + pin of the AD8131 operational amplification chip, the Vi-pin of the AD8131 operational amplification chip is grounded, and the Vo + pin and the Vo-pin are respectively electrically connected with the analog input end of the processor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021331552.8U CN212989542U (en) | 2020-07-09 | 2020-07-09 | Transformer partial discharge on-line measuring system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021331552.8U CN212989542U (en) | 2020-07-09 | 2020-07-09 | Transformer partial discharge on-line measuring system |
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| CN212989542U true CN212989542U (en) | 2021-04-16 |
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| CN202021331552.8U Active CN212989542U (en) | 2020-07-09 | 2020-07-09 | Transformer partial discharge on-line measuring system |
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| GR01 | Patent grant | ||
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: An on-line partial discharge detection system for transformer Effective date of registration: 20220310 Granted publication date: 20210416 Pledgee: Bank of China Limited Wuhan Jiang'an sub branch Pledgor: WUHAN FRIENDS ELECTRIC CO.,LTD. Registration number: Y2022420000054 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |