CN110850137B - Electronic transformer and data processing method - Google Patents
Electronic transformer and data processing method Download PDFInfo
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- CN110850137B CN110850137B CN201810953391.7A CN201810953391A CN110850137B CN 110850137 B CN110850137 B CN 110850137B CN 201810953391 A CN201810953391 A CN 201810953391A CN 110850137 B CN110850137 B CN 110850137B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/181—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using coils without a magnetic core, e.g. Rogowski coils
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention relates to an electronic transformer and a data processing method. When the isolating switch operates, a VFTO signal and/or a VFTC signal is generated in the GIS and is connected in series with a conventional signal, the VFTO signal and/or the VFTC signal is transmitted into the collector after being attenuated and suppressed by the through-type current sensor and the coaxial capacitive voltage sensor, the interference signal subjected to attenuation and suppression by the collector is sampled and filtered again, and the obtained quality effective data is output. According to the invention, attenuation suppression is carried out on the VFTO signal and/or the VFTC signal based on the through-type sensor, and then the VFTO signal and/or the VFTC signal are subjected to filtering processing by the collector, so that the problem of damage of the VFTO signal and/or the VFTC signal to sampled data caused by isolation switch operation in an intelligent substation can be effectively solved.
Description
Technical Field
The invention relates to the field of transformers, in particular to an integrated GIS electronic transformer capable of inhibiting interference of VFTO and VFTC and a data processing method.
Background
The intelligent substation is one of important components of an intelligent power grid and is a key for connecting six links of power generation, power transmission, power transformation, power distribution, power utilization and scheduling of the intelligent power grid. The intelligent transformer substation needs reliable measurement and accurate data, and the electronic transformer is ideal measurement equipment for current and voltage of the intelligent transformer substation and meets the development requirements of the intelligent transformer substation in the future. However, in an intelligent substation and a new generation intelligent substation, a collection unit of an electronic transformer in a Gas insulated fully-closed switch Gear (GIS) and a power supply thereof are easily interfered by Very Fast Transient Overvoltage (VFTO) or Very Fast Transient Current (VFTC) generated in the Gas insulated fully-closed combined electrical apparatus due to operation of an isolating switch, so that sampled data in the intelligent substation is abnormal or even damaged, and thus the working state of the GIS electronic transformer in the intelligent substation is unstable.
In the prior art, various schemes are provided for suppressing interference of VFTO signals or VFTC signals generated by operation on GIS electronic transformer acquisition units. Firstly, a VFTO signal device for inhibiting the operation of an isolating switch is added into the GIS. For example, a series of ferrite beads are disposed on a high voltage conductive rod, the ferrite beads are spaced apart by spacers, and a shielding structure, the ferrite beads, the spacers and a contact device are placed in a housing filled with sulfur hexafluoride gas, thereby suppressing the interference of the VFTO signal based on the improvement of the circuit structure. Secondly, a VFTO signal filter is additionally arranged in a digital acquisition device of the GIS and used for suppressing the interference of the VFTO signal. And thirdly, a protection device for inhibiting the VFTO signal is added, based on a signal protection module and a power supply protection module in the protection device, the interference of the VFTO signal in a signal loop is discharged to the ground in advance, and based on the improvement of a circuit structure, the interference of the VFTO signal is inhibited.
Among the above-mentioned three kinds of schemes, adopt the tradition mode of installing VFTO signal filter or protector additional, can only couple and keep apart the interference of part VFTO signal, unable complete effectual elimination VFTO signal or VFTC signal, especially the interference of VFTC signal to GIS electronic transformer collection unit.
Disclosure of Invention
In view of the above, the present invention provides an integrated GIS electronic transformer and a data processing method for suppressing VFTO and VFTC interference, so as to achieve that the electronic transformer has reliable capability of suppressing VFTO signals and/or VFTC signals.
In order to achieve the above object, the following solutions are proposed:
the invention discloses an electronic transformer in a first aspect, comprising: the system comprises a feed-through current sensor, a coaxial capacitive voltage sensor, a signal terminal flange plate, a PCB (printed circuit board) type mounting bottom plate, two independent collectors, a collection box body, a shell, a conductor to be detected and a grounding seat;
the straight-through current sensor, the straight-through current sensor and the coaxial capacitive voltage sensor are positioned in the shell and are sleeved on the conductor to be measured;
the signal terminal flange plate is arranged on the outer surface of the shell, and the feed-through current sensor, the feed-through current sensor and the coaxial capacitive voltage sensor are connected with the aviation plug on the signal terminal flange plate through shielding wires;
the collecting box body is arranged on the outer surface of the signal terminal flange plate;
the PCB type mounting bottom plate is arranged on the inner side of the collecting box body, and two collector mounting areas which are oppositely arranged are divided on the PCB type mounting bottom plate;
the two independent collectors are respectively embedded into collector mounting areas on the PCB type mounting base plate;
the aviation jack on the PCB type mounting bottom plate is connected with the aviation plug on the signal terminal flange plate through a shielding wire;
the grounding seat is arranged on the outer side of the shell and is used for independent grounding;
the very fast transient overvoltage VFTO signal and/or the very fast transient current VFTC signal pass through the feedthrough current sensor, the coaxial capacitive voltage sensor, the shielding wire and the signal terminal flange plate are transmitted to two independent collectors on the PCB type mounting bottom plate, the two independent collectors sample the VFTO signal and/or the VFTC signal in real time in a preset period at each sampling point to obtain sampling data, and the sampling data is filtered and judged to output the sampling data corresponding to the sampling points with effective quality.
Preferably, in the electronic transformer, the two independent collectors are respectively embedded in the collector installation area on the PCB-type installation base plate in a signal double-row pin manner.
Preferably, in the electronic transformer, the fixed terminals of the collector mounting area disposed on the PCB-type mounting board and the box bodies disposed outside the two independent collectors form a collector box;
the collector box is fixed on the collector mounting area on the PCB type mounting base plate through the fixed terminal.
Preferably, in the electronic transformer, the PCB-type mounting base plate is provided with a fixed mounting hole;
the PCB type mounting bottom plate penetrates through the fixing mounting hole through the fixing piece and is fixed on the inner side of the collecting box body.
Preferably, in the electronic transformer, the feedthrough current sensor is a feedthrough measurement current sensor;
the coil constituting the straight-through measuring current sensor is an LCPT coil.
Preferably, in the electronic transformer, the feedthrough current sensor is a feedthrough protection current sensor;
the coil constituting the feedthrough protection current sensor is a rogowski coil.
Preferably, in the electronic transformer, the coaxial capacitive voltage sensor is a coaxial capacitive voltage division sensor.
Preferably, in the electronic transformer, the collector is composed of an independent power supply, a data acquisition card and an electro-optical conversion sending module;
the independent power supply has a voltage suppression function.
Preferably, in the electronic transformer, the ground socket is provided outside the case and grounded via a ground conductor.
The second aspect of the present invention discloses a data processing method, which comprises:
in a preset period, carrying out real-time sampling on a suppressed Very Fast Transient Overvoltage (VFTO) signal and/or a Very Fast Transient Current (VFTC) signal in each sampling point by two independent collectors to obtain sampling data, wherein the VFTO signal and/or the VFTC signal are generated when an isolating switch connected with the electronic transformer is operated and are transmitted to the two independent collectors on the PCB type mounting bottom plate through a through type current sensor, a coaxial capacitive voltage sensor, a shielding wire and a signal terminal flange plate;
the two independent collectors perform filtering processing on the obtained sampling data;
comparing the filtered sampling data with a preset threshold value;
if the filtered sampling data is smaller than the preset threshold value, determining that the quality of a sampling point corresponding to the sampling data is effective;
and acquiring sampling data output corresponding to the sampling points with effective quality in a preset period.
According to the technical scheme, the invention relates to an integrated GIS electronic transformer capable of inhibiting interference of VFTO and VFTC and a data processing method. When the isolating switch is operated, an interference signal of a VFTO signal and/or a VFTC signal is generated in the GIS and is serially connected into a conventional signal, the interference signal is attenuated and suppressed by the through-type current sensor and the coaxial capacitive voltage sensor and then is transmitted into the collector, the interference signal attenuated and suppressed by the collector is sampled and filtered again, and the obtained quality effective data is output. According to the invention, based on the feedthrough sensor, the attenuation inhibition is carried out on the VFTO signal and/or the VFTC signal, and then the filtering treatment of the collector is carried out, so that the problem that the VFTO signal and/or the VFTC signal damages the sampled data caused by the isolation switch operation in the intelligent substation can be effectively solved.
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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a structural diagram of an integrated GIS electronic transformer with VFTO and VFTC interference suppression according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a PCB-type mounting substrate according to an embodiment of the present invention;
fig. 3 is a flowchart of a data processing method according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a schematic structural diagram of an integrated GIS electronic transformer with VFTO and VFTC interference suppression is disclosed for an embodiment of the present invention. This electronic transformer mainly includes: the device comprises a feed-through current sensor 1, a feed-through current sensor 2, a coaxial capacitive voltage sensor 3, a signal terminal flange 5, a PCB (printed circuit board) type mounting base plate 6, two independent collectors 7, a collection box body 9, a shell 10, a conductor 11 to be detected and a grounding seat 12.
The feed-through current sensor 1, the feed-through current sensor 2 and the coaxial capacitive voltage sensor 3 are located inside the shell 10, and a measured conductor 11 is arranged inside the shell 10.
The feed-through current sensor 1, the feed-through current sensor 2 and the coaxial capacitance voltage sensor 3 are related in the embodiment of the invention. The through structure refers to that a conductor to be tested penetrates through the mutual inductor.
In particular, the feed-through structure, i.e. the hollow structure, is based on the feed-through current sensor 1, the feed-through current sensor 2 and the coaxial capacitive voltage sensor 3. The feed-through current sensor 1, the feed-through current sensor 2 and the coaxial capacitive voltage sensor 3 are sleeved on the conductor 11 to be tested and used for attenuating interference signals of a VFTC signal and a VFTO signal generated by the conductor 11 to be tested when the isolating switch is operated.
The feed-through current sensor 1, the feed-through current sensor 2 and the coaxial capacitive voltage sensor 3 are connected with an aviation plug on a signal terminal flange 5 through a shielding wire 4.
The collecting box body 9 is arranged on the outer surface of the signal terminal flange plate 5.
The PCB type mounting bottom plate 6 is arranged on the inner side of the collection box body 9.
Two opposite collector installation areas are divided on the PCB type installation bottom plate 6.
Preferably, the positions of the collector mounting areas on the PCB-type mounting base plate 6 are divided to be close to the positions where the feed-through current sensor 1, the feed-through current sensor 2 and the coaxial capacitive voltage sensor 3 are connected to the signal terminal flange 5.
The two independent collectors 7 are respectively embedded in collector mounting areas on the PCB type mounting base plate 6.
That is, the two independent collectors 7 are installed near the feedthrough current sensor 1, the feedthrough current sensor 2, and the coaxial capacitive voltage sensor 3.
Optionally, overvoltage filters are installed at the power ports of the two independent collectors 7, so that the destructive nature of the TEV appearing on the housing 10 due to the interference of the VFTO signal can be restrained and protected.
Optionally, passive low-pass filters may be disposed at signal inlets of the two independent collectors to suppress common-mode interference and differential-mode interference.
It should be noted that the two independent collectors 7 are collectors with independent power supplies.
And the aviation jack on the PCB type mounting bottom plate 6 is connected with the aviation plug on the signal terminal flange plate 5 through a shielding wire 4. By this connection, the feed-through current sensor 1, the feed-through current sensor 2 and the coaxial capacitive voltage sensor 3 can be connected to two separate collectors 7. The interference of external radiation to effective signals can be reduced by installing the PCB type mounting bottom plate 6, the two independent collectors 7 and the shielding wire 4 in the collecting box body 9.
The ground holder 12 is provided outside the housing 10 and is grounded via a ground conductor 13. By arranging the independent grounding seat and grounding through the grounding conductor, the integrated GIS electronic transformer capable of inhibiting the interference of the VFTO and the VFTC disclosed by the embodiment of the invention can more comprehensively inhibit the interference of the VFTO signal and/or the VFTC signal and can shield the influence of an external complex magnetic field on the electronic transformer.
As shown in fig. 1, the isolating switch 14 is connected to the electronic transformer, when the isolating switch 14 is operated, a VFTO signal and/or a VFTC signal is generated in the electronic transformer, and the VFTO signal and/or the VFTC signal are transmitted to the two independent collectors 7 on the PCB-type mounting base plate 6 through the through-type current sensor 1, the through-type current sensor 2, the coaxial capacitive voltage sensor 3, the shielding wire 4 and the signal terminal flange plate 5.
The two independent collectors 7 sample the VFTO signals and/or the VFTC signals of each sampling point in real time in a preset period to obtain sampling data, and the sampling data is subjected to software filtering processing and quality judgment to output the sampling data corresponding to the sampling points with effective quality.
In the concrete implementation, the output ends of the two independent collectors 7 are connected with optical fibers 8, and sampling data corresponding to sampling points with effective quality are transmitted to the merging unit in real time through the optical fibers 8 in the form of optical signals.
Based on the integrated GIS electronic transformer capable of suppressing the interference of the VFTO and the VFTC, once the isolating switch 14 is operated to generate the VFTO signal and/or the VFTC signal in the electronic transformer, the feedthrough current sensor 1, the feedthrough current sensor 2 and the coaxial capacitive voltage sensor 3 of the electronic transformer can attenuate and suppress the VFTO and the VFTC signal, the attenuated and suppressed signals are transmitted to the two independent collectors 7 on the PCB type mounting base plate 6 through the shielding wire 4 and the signal terminal flange 5, and the two independent collectors 7 sample conventional signals with the VFTO signal and/or the VFTC signal in real time in a preset period and filter sampled data.
The invention relates to an integrated GIS electronic transformer capable of inhibiting interference of VFTO and VFTC. And two independent collectors arranged on the PCB type mounting base plate. When the isolating switch operates, a VFTO signal and/or a VFTC signal is generated in the GIS and is connected in series with a conventional signal, the VFTO signal and/or the VFTC signal is transmitted into the collector after being attenuated and suppressed by the through-type current sensor and the coaxial capacitive voltage sensor, the interference signal subjected to attenuation and suppression by the collector is sampled and filtered again, and the obtained quality effective data is output. According to the invention, based on the feedthrough sensor, the attenuation inhibition is carried out on the VFTO signal and/or the VFTC signal, and then the filtering treatment of the collector is carried out, so that the problem that the VFTO signal and/or the VFTC signal damages the sampled data caused by the isolation switch operation in the intelligent substation can be effectively solved.
Based on the integrated GIS electronic transformer capable of suppressing VFTO and VFTC interference disclosed in the embodiment of the present invention, optionally, the two independent collectors 7 are respectively embedded in the collector installation area on the PCB-type installation base plate 6 in a signal double-row pin manner.
According to the integrated GIS electronic transformer capable of inhibiting the interference of the VFTO and the VFTC, the two independent collectors 7 are connected with the PCB type mounting base plate 6 in a double-row pin mode, and the reliability of signal transmission can be further ensured.
Optionally, a fixed mounting hole is formed in the PCB mounting base plate, and the PCB mounting base plate 6 penetrates through the fixed mounting hole through a fixing member and is fixed to the inner side of the collection box 9.
According to the integrated GIS electronic transformer capable of inhibiting the interference of VFTO and VFTC, disclosed by the embodiment of the invention, the collection box body is fixedly installed with the PCB type installation bottom plate 6 through the fixed terminal, so that the connection of double rows of pins of two independent collectors 7 cannot be influenced by vibration in the transportation process, and the reliability of the double rows of pins of the collectors is improved.
Further, two independent collector 7 mounting areas on the PCB-type mounting base plate 6 are provided with fixing terminals. A box body is arranged on the outer sides of the two independent collectors 7 to form a collector box, and the collector box is fixed in a collector mounting area on the PCB type mounting base plate 6 through the fixing terminal.
By adding a box outside the two independent collectors 7, the interference of an external magnetic field can be shielded, and the two independent collectors 7 are protected.
Based on the integrated GIS electronic transformer capable of suppressing interference of VFTO and VFTC disclosed in the embodiment of the present invention, optionally, the shielded wire 4 is a double-layer shielded wire. Further optionally, the shield wire 4 is a double-layer cable shield wire.
Based on the integrated GIS electronic transformer capable of suppressing the interference of VFTO and VFTC disclosed in the embodiment of the present invention, optionally, the feedthrough current sensor 1 is a feedthrough measurement current sensor.
The coil constituting the straight-through measuring current sensor is an LCPT coil.
Based on the electronic transformer disclosed in the embodiment of the present invention, optionally, the feedthrough current sensor 2 is a feedthrough protection current sensor.
The coil constituting the feedthrough protection current sensor is a rogowski coil.
Based on the electronic transformer disclosed in the embodiment of the present invention, optionally, the coaxial capacitive voltage sensor 3 is a coaxial capacitive voltage dividing sensor.
Based on the integrated GIS electronic transformer capable of inhibiting the interference of the VFTO and the VFTC disclosed by the embodiment of the invention, optionally, the two independent collectors 7 are composed of independent power supplies, a data acquisition card and an electro-optical conversion sending module. The independent power supply has an overvoltage suppression function.
Based on the integrated GIS electronic transformer capable of suppressing VFTO and VFTC interference disclosed in the above embodiment of the present invention, optionally, the grounding seat 12 is disposed outside the housing 10 and grounded through the grounding conductor 13.
Based on the integrated GIS electronic transformer capable of inhibiting the interference of the VFTO and the VFTC, the influence of the lifting of the TEV on the destructive acquisition circuit can be reduced by optionally arranging an independent grounding seat.
In the specific implementation of the integrated GIS electronic transformer capable of suppressing interference of VFTO and VFTC disclosed in the embodiment of the present invention, as shown in fig. 2, the integrated GIS electronic transformer is a schematic structural diagram of the PCB-type mounting base plate disclosed in the embodiment of the present invention.
The PCB type mounting bottom plate is provided with mounting areas of two independent collectors 7 of PIN1 and PIN2, and SH is a fixed terminal for fixing a collector box. MH is a fixed mounting hole of the PCB mounting base plate 6.
The PCB type mounting base plate is provided with aviation jacks IPA1, IPB1 and IPC1 for three-phase protection current signals of the collector 1, and is used for assisting the collector 1 to be connected with a feed-through current sensor and a coaxial capacitive voltage sensor through a signal terminal flange.
The PCB type mounting base plate is provided with aviation jacks IPA2, IPB2 and IPC2 for three-phase protection current signals of the collector 2, and is used for assisting the collector 2 to be connected with a feed-through current sensor and a coaxial capacitive voltage sensor through a signal terminal flange.
The PCB type mounting base plate is provided with aviation jacks IMA, IMB and IMC for three-phase measuring current signals of two independent collectors, and the aviation jacks IMA, IMB and IMC are used for assisting the two independent collectors to be connected with a through type current sensor through a signal terminal flange plate and a coaxial capacitive voltage sensor.
It should be noted that, since the voltage converted by the voltage sensor is 100V, the amplitude is large, and the voltage cannot be directly input into the collector. Therefore, aviation jacks UMA, UMB and UMC of a small voltage transformer for accessing three-phase measurement voltage signals are arranged on the PCB type mounting bottom plate and are used for accessing the small voltage transformer and converting the voltage transmitted by the coaxial capacitive voltage sensor into a small voltage signal for being used by a collector.
In addition, any one of 12 paths of signals including three types of three-phase protection current signals, three-phase measurement current signals and three-phase measurement voltage can be accessed according to actual measurement requirements to work.
The embodiment of the invention discloses an integrated GIS electronic transformer capable of inhibiting interference of VFTO and VFTC, and further discloses a method for processing data based on the electronic transformer.
Fig. 3 is a schematic flow chart of a method for processing data based on the electronic transformer according to an embodiment of the present invention. The method mainly comprises the following steps:
s301: and in a preset period, the two independent collectors sample the suppressed VFTO signal and/or VFTC signal in each sampling point in real time to obtain sampling data.
In the process of executing step S301, the VFTO signal and/or the VFTC signal are generated when an isolating switch connected to the electronic transformer is operated, and are transmitted to a PCB-type mounting board provided with a collector via a feedthrough sensor, a shielded wire, and a signal terminal flange. And sampling the VFTO signal and/or the VFTC signal in real time through a collector to obtain corresponding sampling data.
During the arrival of the VFTO signal and the VFTC signal at the collector, the VFTO signal and the VFTC signal are suppressed by the hardware structure.
S302: and the two independent collectors perform filtering processing on the obtained sampling data.
In the process of executing step S302, two independent collectors filter discrete mutation anomaly data in the sampled data.
Optionally, a software median filtering method may be adopted to perform real-time filtering on abnormal data with discrete mutation in the sampled data.
And S303, comparing the filtered sampling data with a preset threshold value.
In the process of executing step S303, the two independent collectors compare the filtered sampled data with a preset threshold, where the threshold refers to a critical value for validity and invalidity of the collected data.
S304: and judging whether the filtered sample data is smaller than the preset threshold value, if so, executing S305, and if not, executing S306.
S305: and determining that the quality of the sampling point corresponding to the sampling data is effective.
S306: and determining that the quality of the sampling point corresponding to the sampling data is invalid.
S307: and acquiring sampling data output corresponding to the sampling points with effective quality in a preset period.
In the process of executing step S307, the sampling data corresponding to the sampling points with effective quality in the preset period is packed according to the communication protocol, the sampling data with effective quality is converted from the electrical signal to the optical signal, and the optical signal is output to the merging unit through the optical fiber.
Based on the disclosed electronic sensor, the electronic transformer comprises a straight-through current sensor, a straight-through current sensor and a coaxial capacitive voltage sensor. And two independent collectors arranged on the PCB type mounting base plate. When the isolating switch is operated, a VFTO signal and/or a VFTC signal are/is generated in the GIS and serially connected into a conventional signal, the conventional signal is transmitted into the collector after being attenuated and suppressed by the through-type current sensor and the coaxial capacitive voltage sensor, the interference signal after being attenuated and suppressed by the collector is sampled and filtered again, and the filtered sampled data is compared with a preset threshold value; if the filtered sampling data is smaller than the preset threshold value, determining that the quality of a sampling point corresponding to the sampling data is effective; and acquiring sampling data output corresponding to the sampling points with effective quality in a preset period. And the filtering processing adopts a software median filtering method to filter discrete and abrupt abnormal data in the sampled data in real time. According to the invention, based on the feedthrough sensor, the attenuation inhibition is carried out on the VFTO signal and/or the VFTC signal, and then the filtering treatment of the collector is carried out, so that the problem that the VFTO signal and/or the VFTC signal damages the sampled data caused by the isolation switch operation in the intelligent substation can be effectively solved.
In summary, the embodiment of the invention discloses an integrated GIS electronic transformer capable of suppressing VFTO and VFTC interference and a data processing method. The integrated GIS electronic transformer comprises a straight-through measuring current sensor, a straight-through protective current sensor, a coaxial capacitive voltage sensor, a signal terminal flange plate, a PCB type mounting base plate, two collectors with independent power supplies, a collection box body, a body shell, an independent grounding point and other structures and processing modes, and can protect electromagnetic interference. Particularly, the problem that sampled data are damaged by VFTO signals and/or VFTC signals caused by isolation switch operation in an intelligent substation is effectively solved.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. An electronic transformer, comprising: the device comprises a feed-through current sensor (1), a feed-through current sensor (2), a coaxial capacitive voltage sensor (3), a signal terminal flange plate (5), a PCB (printed circuit board) type mounting base plate (6), two independent collectors (7), a collecting box body (9), a shell (10), a conductor to be detected (11) and a grounding seat (12);
the straight-through current sensor (1), the straight-through current sensor (2) and the coaxial capacitive voltage sensor (3) are positioned in the shell (10) and are sleeved on the measured conductor (11); the conductor under test (11) passes through the feed-through current sensor (1), the feed-through current sensor (2) and the coaxial capacitive voltage sensor (3); the feed-through current sensor (1) is a feed-through measuring current sensor; the coil forming the straight-through measuring current sensor is an LCPT coil; the feed-through current sensor (2) is a feed-through protective current sensor; the coil forming the straight-through protective current sensor is a Rogowski coil; the coaxial capacitive voltage sensor (3) is a coaxial capacitive voltage division sensor;
the signal terminal flange (5) is mounted on the outer surface of the shell (10), and the feed-through current sensor (1), the feed-through current sensor (2) and the coaxial capacitive voltage sensor (3) are connected with an aviation plug on the signal terminal flange (5) through a shielding wire (4);
the acquisition box body (9) is arranged on the outer surface of the signal terminal flange plate (5); the PCB type mounting bottom plate (6), the two independent collectors (7) and the shielding wire (4) are mounted in the collecting box body (9);
the PCB type mounting bottom plate (6) is arranged on the inner side of the collecting box body (9), and two opposite collector mounting areas are divided on the PCB type mounting bottom plate (6); the collector installation area is close to the positions of the straight-through current sensor (1), the straight-through current sensor (2) and the coaxial capacitive voltage sensor (3); the PCB-type mounting bottom plate (6) is used for collecting a plurality of circuits of the straight-through current sensor (1), the straight-through current sensor (2) and the coaxial capacitive voltage sensor (3) and distributing signals to the two independent collectors (7); the signal is a small voltage signal;
the PCB type mounting bottom plate (6) is provided with an aviation jack for three-phase protection current signals and an aviation jack for three-phase measurement current signals of the two independent collectors (7); the PCB type mounting bottom plate (6) is also provided with an aviation jack of a small voltage transformer for accessing a three-phase measurement voltage signal, and the aviation jack is used for accessing the small voltage transformer; the small voltage transformer is used for converting the voltage transmitted by the coaxial capacitive voltage sensor (3) into the small voltage signal for the two independent collectors (7) to use;
the two independent collectors (7) are respectively embedded into collector mounting areas on the PCB type mounting base plate (6) in a signal double-row pin mode; the two independent collectors (7) are composed of independent power supplies, data acquisition cards and an electro-optical conversion sending module; the independent power supply has a voltage suppression function;
the aviation jack on the PCB type mounting bottom plate (6) is connected with the aviation plug on the signal terminal flange plate (5) through a shielding wire (4);
the grounding seat (12) is arranged on the outer side of the shell (10) and is used for independent grounding;
very fast transient overvoltage VFTO signal and/or very fast transient current VFTC signal via on PCB formula mounting plate (6) two independent collectors (7), two independent collectors (7) are to each sampling point in presetting the cycle VFTO signal and/or the VFTC signal is sampled in real time, obtains the sampled data, and is right the sampled data carries out filtering process and quality judgement, the sampled data output that corresponds the effectual sampling point of quality.
2. The electronic transformer of claim 1, further comprising: the fixed terminals of the collector mounting area are arranged on the PCB type mounting base plate (6), and the box bodies are arranged on the outer sides of the two independent collectors (7) to form a collector box;
the collector box is fixed on a collector mounting area on the PCB type mounting base plate (6) through the fixed terminal.
3. The electronic transformer according to claim 1, characterized in that the PCB-type mounting base plate (6) is provided with a fixed mounting hole;
the PCB type mounting bottom plate (6) penetrates through the fixed mounting hole through a fixing piece and is fixed on the inner side of the collection box body (9).
4. An electronic transformer according to any one of claims 1-3, characterized in that the grounding base (12) is arranged outside the housing (10) and is grounded via a grounding conductor (13).
5. A data processing method applied to the electronic transformer as claimed in any one of claims 1 to 3, the method comprising:
in a preset period, sampling a suppressed Very Fast Transient Overvoltage (VFTO) signal and/or a Very Fast Transient Current (VFTC) signal in each sampling point by two independent collectors in real time to obtain sampling data, wherein the VFTO signal and/or the VFTC signal are generated when an isolating switch (14) connected with the electronic transformer is operated and are transmitted to the two independent collectors on a PCB (printed circuit board) type mounting bottom plate through a through type current sensor, a coaxial capacitive voltage sensor, a shielding wire and a signal terminal flange plate;
the two independent collectors perform filtering processing on the obtained sampling data;
comparing the filtered sampling data with a preset threshold value;
if the filtered sampling data is smaller than the preset threshold value, determining that the quality of a sampling point corresponding to the sampling data is effective;
and acquiring sampling data output corresponding to the sampling points with effective quality in a preset period.
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