CN212514855U - Partial discharge ultrahigh frequency monitoring system - Google Patents
Partial discharge ultrahigh frequency monitoring system Download PDFInfo
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- CN212514855U CN212514855U CN202020722154.2U CN202020722154U CN212514855U CN 212514855 U CN212514855 U CN 212514855U CN 202020722154 U CN202020722154 U CN 202020722154U CN 212514855 U CN212514855 U CN 212514855U
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- ultrahigh frequency
- partial discharge
- protector
- monitoring system
- superfrequency
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Abstract
The utility model relates to a partial discharge ultrahigh frequency monitoring system, which comprises a data acquisition module, a 100kV partial discharge-free test transformer, a protective resistor and an ultrahigh frequency amplifier, the water resistance terminal, superfrequency capacitance sensor and protector, two water resistance terminals are located respectively on two terminal nodes of cable, 100kV does not have partial discharge test transformer and passes through the first water resistance terminal of protective resistance connection, two superfrequency capacitance sensor of series connection between two water resistance terminals, 100kV does not have partial discharge test transformer is connected to first superfrequency capacitance sensor, first protector is connected to second superfrequency capacitance sensor, superfrequency amplifier, data acquisition module and PC are connected in proper order to first protector, the intermediate node at two water resistance terminals is connected to the one end of second protector, superfrequency amplifier is connected to the other end, be equipped with the needle electrode between two superfrequency capacitance sensor. Compared with the prior art, the utility model has the advantages of practice thrift cost, application scope extensively etc.
Description
Technical Field
The utility model belongs to the technical field of the monitoring facilities of the partial discharge of superfrequency band and specifically relates to a partial discharge superfrequency monitoring system is related to.
Background
The source of the partial discharge inside the power cable insulation system can be seen as a source of a point pulse signal, i.e. an electromagnetic wave generated in space by the discharge and generated over time as an electromagnetic disturbance. The electromagnetic wave is a function of time and position, being a transverse electromagnetic wave (TEM wave). Such electromagnetic pulses may propagate along the cable, since the coaxial structure of the cable may be regarded as a waveguide for electromagnetic waves. During field measurement, the interference far away from the sensor under the ultrahigh frequency is attenuated quickly, and can be identified by using a proper method, so that the ultrahigh frequency technology is theoretically suitable for online detection of cables and joint accessories thereof. It is worth noting that the attenuation of the signal under the ultrahigh frequency is much more serious than that of the low frequency signal, and generally, the signal can only be transmitted in a cable for dozens of meters or even shorter, and the signal is easy to be folded and reflected on an interface, so that a plurality of sensors are required to be installed during online monitoring, and are installed at the joint or end part close to the cable as much as possible, and the metal surface is avoided, thereby greatly improving the equipment cost. In addition, the detection of the partial discharge signal in the ultrahigh frequency band is different from the conventional measurement of the partial discharge signal below 1MHz, and the discharge signal in nanosecond (ns) level needs to be acquired without distortion, so that a high-speed sampling technology needs to be adopted. Therefore, how to provide an ultrahigh frequency monitoring system which can reduce the number of devices and the cost of the devices, and at the same time can realize high speed and accuracy becomes a problem to be solved at present.
SUMMERY OF THE UTILITY MODEL
The purpose of the utility model is to provide a partial discharge ultrahigh frequency monitoring system of reduce cost, high-speed collection in order to overcome the defect that above-mentioned prior art exists.
The purpose of the utility model can be realized through the following technical scheme:
a partial discharge ultrahigh frequency monitoring system is used for detecting partial discharge signals of a power cable and comprises a data acquisition module, a 100kV non-partial discharge test transformer, a protective resistor, a needle electrode, an ultrahigh frequency amplifier, a PC (personal computer), two water resistance terminals, two ultrahigh frequency capacitance sensors and two protectors, wherein the two water resistance terminals are respectively arranged on two terminal nodes of the cable, the 100kV non-partial discharge test transformer is connected with a first water resistance terminal through the protective resistor, the two ultrahigh frequency capacitance sensors are connected in series between the two water resistance terminals, the first ultrahigh frequency capacitance sensor is connected with the 100kV non-partial discharge test transformer, the second ultrahigh frequency capacitance sensor is connected with a first protector, the first protector is sequentially connected with the ultrahigh frequency amplifier, the data acquisition module and the PC, one end of the second protector is connected with a middle node of the two water resistance terminals, the other end of the circuit is sequentially connected with an ultrahigh frequency amplifier, a data acquisition module and a PC (personal computer), the ultrahigh frequency amplifier, the data acquisition module and the PC form a loop together with a first protector and a second ultrahigh frequency capacitive sensor, and a needle electrode serving as a local discharge source is arranged between the first ultrahigh frequency capacitive sensor and the second ultrahigh frequency capacitive sensor.
Preferably, the data acquisition module adopts a digital oscilloscope.
Preferably, the data acquisition module adopts a high-speed acquisition card.
Preferably, the digital oscilloscope is connected with a PC through a GPIB card.
Preferably, the digital oscilloscope adopts a Tek TDS 3052 digital oscilloscope.
Preferably, the ultrahigh frequency amplifier is a 10 MHz-500 MHz ultrahigh frequency amplifier.
Preferably, the first protector and the second protector are grounded respectively.
Compared with the prior art, the utility model discloses following beneficial effect has:
1) the utility model discloses a monitoring system does not have partial discharge test transformer through 100kV and connects two water resistance terminals to two superfrequency capacitance sensor of establishing ties between two water resistance terminals, set up the needle electrode as the partial discharge source between two superfrequency capacitance sensor, and superfrequency capacitance sensor connects the protector, the protector realizes the collection and the monitoring of superfrequency band partial discharge signal through connecting superfrequency amplifier, digital oscilloscope or high-speed collection card and PC, need not the installation of too much sensor, reduced required equipment quantity, practiced thrift equipment cost;
2) the monitoring system of the utility model utilizes a digital oscilloscope or a high-speed acquisition card to acquire the partial discharge signals of the ultrahigh frequency band, can meet the real high-speed and accurate acquisition requirements, and the sampling rate can at least reach more than 2 GS/s;
3) the utility model discloses monitoring system's simple structure, the equipment is convenient, has wider application scope.
Drawings
FIG. 1 is a block diagram of the partial discharge ultrahigh frequency monitoring system of the present invention;
the reference numbers in the figures indicate:
t, 100kV partial discharge-free test transformer; r, a protective resistor; WT, water resistance termination; c1, C2, uhf capacitive sensor; n, needle electrodes; p1, P2, protector; a, an ultrahigh frequency amplifier; SC, digital oscilloscope.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.
Examples
The utility model provides a partial discharge superfrequency monitoring system for power cable's partial discharge signal detects, and this system includes that digital oscilloscope, 100kV do not have partial discharge test transformer, superfrequency capacitance sensor, protection resistance, protector, water resistance terminal, needle electrode, superfrequency amplifier and PC.
As shown in fig. 1, T is a 100kV no partial discharge test transformer; r is a protective resistor; WT is a water resistance terminal; c1 and C2 are two ultrahigh frequency capacitive sensors respectively; n is a needle electrode; p1 and P2 are two protectors; a is an ultrahigh frequency amplifier; SC is a digital oscilloscope.
The 100kV partial discharge-free test transformer T is used for providing power frequency high voltage for the whole measuring system. R is a protective resistor which can play the roles of current limiting and high frequency resistance. In practical deployment, a hydroelectric group terminal WT is connected to each of two termination nodes of the cable, namely, the most proximal end and the most distal end, for preventing the cable termination from discharging. The 100kV non-partial discharge test transformer T is connected with a water resistance terminal WT through a protection resistor R, and the protection resistor R is mainly used for eliminating high-frequency interference on a high-voltage side.
Two ultrahigh frequency capacitive sensors C1 and C2 are connected in series between the two water resistive terminals WT. One ultrahigh frequency capacitive sensor C1 is connected with a 100kV non-partial discharge test transformer T, the other ultrahigh frequency capacitive sensor C2 is connected with a protector P1, and a protector P1 is sequentially connected with an ultrahigh frequency amplifier A, a digital oscilloscope SC and a PC. One end of the protector P2 is connected with the middle node of the two water resistance terminals WT, and the other end is sequentially connected with the ultrahigh frequency amplifier A, the digital oscilloscope SC and the PC, and forms a loop with the protector P1 and the ultrahigh frequency capacitance sensor C2. The protectors P1 and P2 are grounded, respectively. The needle electrode N is arranged between the two ultrahigh frequency capacitance sensors C1 and C2 and connected with a 100kV non-partial discharge test transformer T, and the needle electrode N is used as a partial discharge source. In this embodiment, the digital oscilloscope SC and the PC are connected via a GPIB card, and can be interconnected. When the voltage is increased, the collected partial discharge signal can be obtained through the digital oscilloscope, the signal is transmitted to the PC to realize real-time monitoring, and the frequency spectrum analysis can be carried out according to the monitored signal.
In the embodiment, as a preferable scheme, the ultrahigh frequency amplifier A adopts a 10 MHz-500 MHz ultrahigh frequency amplifier, the digital oscilloscope SC adopts a Tek TDS 3052 digital oscilloscope, and the sampling rate is 5 GS/s.
As another embodiment, a high-speed acquisition may be used to replace a digital oscilloscope to acquire the partial discharge signal in the ultrahigh frequency band, and the high-speed acquisition card is a common technical solution in the prior art and will not be described herein.
The utility model discloses a monitoring system does not have partial discharge test transformer through 100kV and connects two water resistance terminals to two superfrequency capacitance sensor of establishing ties between two water resistance terminals, set up the needle electrode as the partial discharge source between two superfrequency capacitance sensor, and superfrequency capacitance sensor connects the protector, the protector realizes the collection and the monitoring of superfrequency band partial discharge signal through connecting superfrequency amplifier, digital oscilloscope or high-speed collection card and PC, need not the installation of too much sensor, reduced required equipment quantity, practiced thrift equipment cost; the digital oscilloscope or the high-speed acquisition card is used for acquiring the partial discharge signals of the ultrahigh frequency band, so that the real high-speed and accurate acquisition requirement can be met, and the sampling rate can at least reach over 2 GS/s.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A partial discharge ultrahigh frequency monitoring system is used for detecting partial discharge signals of a power cable and is characterized by comprising a data acquisition module, a 100kV non-partial discharge test transformer, a protective resistor, a needle electrode, an ultrahigh frequency amplifier, a PC (personal computer), a first water resistor terminal, a second water resistor terminal, a first ultrahigh frequency capacitor sensor, a second ultrahigh frequency capacitor sensor, a first protector and a second protector, wherein the two water resistor terminals are respectively arranged on two terminal nodes of the cable, the 100kV non-partial discharge test transformer is connected with the first water resistor terminal through the protective resistor, the two ultrahigh frequency capacitor sensors are connected in series between the two water resistor terminals, the first ultrahigh frequency capacitor sensor is connected with the 100kV non-partial discharge test transformer, the second ultrahigh frequency capacitor sensor is connected with the first protector, the first protector is sequentially connected with the ultrahigh frequency amplifier, the data acquisition module and the PC, one end of the second protector is connected with an intermediate node of the two water resistance terminals, the other end of the second protector is sequentially connected with the ultrahigh frequency amplifier, the data acquisition module and the PC, the ultrahigh frequency amplifier, the data acquisition module and the PC form a loop with the first protector and the second ultrahigh frequency capacitance sensor, a needle electrode serving as a local discharge source is arranged between the first ultrahigh frequency capacitance sensor and the second ultrahigh frequency capacitance sensor, and the needle electrode is connected with a 100kV non-partial discharge test transformer.
2. The partial discharge ultrahigh frequency monitoring system according to claim 1, wherein the data acquisition module employs a digital oscilloscope.
3. The partial discharge ultrahigh frequency monitoring system according to claim 1, wherein the data acquisition module employs a high speed acquisition card.
4. The partial discharge ultrahigh frequency monitoring system according to claim 2, wherein said digital oscilloscope is connected with a PC through a GPIB card.
5. The partial discharge ultrahigh frequency monitoring system according to claim 2, wherein the digital oscilloscope is a Tek TDS 3052 digital oscilloscope.
6. The partial discharge ultrahigh frequency monitoring system according to claim 1, wherein the ultrahigh frequency amplifier is a 10MHz to 500MHz ultrahigh frequency amplifier.
7. The partial discharge uhf monitoring system of claim 1, wherein the first protector and the second protector are grounded, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020722154.2U CN212514855U (en) | 2020-05-06 | 2020-05-06 | Partial discharge ultrahigh frequency monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020722154.2U CN212514855U (en) | 2020-05-06 | 2020-05-06 | Partial discharge ultrahigh frequency monitoring system |
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| Publication Number | Publication Date |
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| CN212514855U true CN212514855U (en) | 2021-02-09 |
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| CN202020722154.2U Active CN212514855U (en) | 2020-05-06 | 2020-05-06 | Partial discharge ultrahigh frequency monitoring system |
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| CN (1) | CN212514855U (en) |
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2020
- 2020-05-06 CN CN202020722154.2U patent/CN212514855U/en active Active
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