CN108896950B - Automatic switching device for verifying secondary wiring of program-controlled three-phase combined transformer - Google Patents
Automatic switching device for verifying secondary wiring of program-controlled three-phase combined transformer Download PDFInfo
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- CN108896950B CN108896950B CN201810789963.2A CN201810789963A CN108896950B CN 108896950 B CN108896950 B CN 108896950B CN 201810789963 A CN201810789963 A CN 201810789963A CN 108896950 B CN108896950 B CN 108896950B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
- G01R35/007—Standards or reference devices, e.g. voltage or resistance standards, "golden references"
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- Engineering & Computer Science (AREA)
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- Testing Electric Properties And Detecting Electric Faults (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a device for verifying automatic switching of secondary wiring of a program-controlled three-phase combined transformer, which comprises a junction box: the detection circuit comprises 3 current load boxes, 3 voltage load boxes and a plurality of relays, wherein each detection port of the detection circuit is connected with a connector used for plugging and unplugging a secondary voltage terminal and a secondary current terminal of a mutual inductor to be detected; a calibrator; secondary side of the standard transformer: the device is connected with a calibrator through a junction box to provide a measuring signal required by calibration; a control device: and the control of the relay in the junction box is realized so as to realize the switching of the verification mode. The plug connectors are arranged at the verification ports of the terminal box verification circuit, so that the secondary side of the transformer to be detected can be quickly plugged and pulled, the working efficiency and the safety index of the verification process are improved, and the higher and higher requirements of distribution network development on the verification work of the three-phase combined transformer are met.
Description
Technical Field
The invention relates to the technical field of distribution network combined transformer verification, in particular to a device for verifying automatic secondary wiring switching of a program-controlled three-phase combined transformer.
Background
The three-phase combined mutual inductor is an important metering device in a power distribution network, and the stability and the reliability of the performance of the three-phase combined mutual inductor are related to the fairness of trade settlement and the lean level of line loss. The calibration rules of the current mutual inductor are all based on single phase, but the combined mutual inductor actually works in a strong electromagnetic field coupling environment, and a single-phase detection method cannot reflect the actual operation state of the combined mutual inductor, so that the calibration rules of the three-phase combined mutual inductor to be issued by the country require that the combined mutual inductor needs to be calibrated under a three-phase method, namely, three phases are simultaneously boosted and flow, which provides higher requirements for the calibration efficiency of the three-phase combined mutual inductor. At present, in the verification work of the combined transformer, a traditional working mode of manual wiring is mostly adopted, as shown in fig. 4 to 7, the following problems still exist: the combined transformer is divided into three-phase elements and two three-phase elements, and different wiring modes are adopted, so that when transformers with different element numbers and types are switched, secondary connection, a load box and a check meter of a standard transformer need to be performed again, and the efficiency of verification work is greatly influenced; when the current transformer part and the voltage transformer part are verified, the input wiring terminal shared by the calibrator is required to be connected again, so that the verification work efficiency is influenced; thirdly, different calibrating personnel are not always in the same wiring operation mode, the probability of wiring errors is high in repeated wiring work, and potential safety hazards exist; fourthly, the wiring among the secondary standard mutual inductor, the load box and the calibrator is plugged and pulled out for a plurality of times for a long time, so that the physical loss of the wiring terminal can be greatly increased, and certain damage is caused to equipment.
Disclosure of Invention
The invention provides a device for verifying automatic switching of secondary wiring for a program-controlled three-phase combined transformer, which aims to solve the technical problems.
The invention is realized by the following technical scheme:
the utility model provides a device of programme-controlled formula three-phase combination mutual-inductor examination secondary wiring automatic switch-over, includes:
a junction box: the verification circuit comprises 3 current load boxes, 3 voltage load boxes and a plurality of relays, and each verification port of the verification circuit is connected with a connector used for plugging and unplugging a secondary voltage terminal and a secondary current terminal of the mutual inductor to be detected;
a control device: and the control of the relay in the junction box is realized so as to realize the switching of the verification mode.
The scheme is that the calibration instrument is connected through a junction box; the terminal box is connected with the calibration instrument to provide a measuring signal required by calibration, and the plug connectors are arranged at all calibration ports of the terminal box calibration circuit, so that the secondary side of the transformer to be tested can be quickly plugged and pulled out conveniently, and the working efficiency is improved. The control device can realize the selection of the verification mode without rewiring through the control of the relay of the verification circuit, perfects the whole verification system, greatly improves the working efficiency and the safety index of the verification process, and meets the higher and higher requirements of the distribution network development on the verification work of the three-phase combined transformer.
Preferably, the junction box comprises a first junction box and a second junction box, the verification port is arranged on the first junction box, and the secondary sides of the standard transformers are connected with the second junction box.
Further, the verification port comprises a port ax, a port bx, a port cx, a port nx, a port AS1, a port AS2, a port BS1, a port BS2, a port CS1 and a port CS2, the port bx is connected with the ground through a first relay, a first current load box, a second relay, a second current load box, a third relay, a third current load box and a fourth relay of the verification circuit in the first junction box are connected in series to form a closed loop, the port ax is connected to a common end of the first current load box and a common end of the fourth relay, the common ends of the first current load box and the second relay are connected with the ground through a fifth relay, the common ends of the second current load box and the third relay are connected with the ground through a sixth relay, the common ends of the third current load box and the fourth relay are connected with the ground through a seventh relay, the port bx and the second relay, The common end of the second current load box is connected, the port cx is connected with the common ends of the third relay and the third current load box, the port nx is grounded, and the port AS2, the port BS2 and the port CS2 are respectively connected with the first voltage load box, the second voltage load box and the third voltage load box. The current load box is the CT load box, and the voltage load box is the PT load box. And three CT load boxes and three PT load boxes in the first junction box are respectively used for controlling the verification wiring mode of the current and voltage parts of the three-phase combined transformer. The first relay, the second relay, the third relay, the fourth relay, the fifth relay, the sixth relay and the seventh relay control the on-off of current in the first junction box and switch two verification wiring modes of two elements and three elements.
The second junction box comprises a port a2, a port b0, a port n0, a port x1, a port k1, a port D1 and a port D1, wherein the port a1 is connected with the port b 1 through an eighth relay, a twelfth relay, a fourteenth relay and a sixteenth relay are respectively connected between the port x1 and the port k1, the port x1 is connected with the port x1 through a tenth relay, the port k1 is connected with the port AS1 through a thirteenth relay, the port x1 is connected with the port b 1 through an eleventh relay, a ninth relay in turn, and a common terminal of the eleventh relay and the ninth relay are simultaneously connected with the port x1, the port 1 through a fifteenth relay, the port 36k 1 is connected with the seventeenth relay, the port D1, the port D2 and the port D3 are all grounded.
The second junction box also comprises a plurality of connecting wires which lead the port connection in the first junction box to the secondary side of the calibrator and the standard transformer.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention reduces the extra working time caused by changing the wiring mode in the verification work, thereby greatly improving the working efficiency;
2. the invention simplifies the wiring circuit, greatly reduces the possibility of wiring errors in the wiring, improves the accuracy of verification work and avoids potential safety hazards caused by wiring errors;
3. the invention greatly reduces the plugging times of the wiring among the secondary side of the standard mutual inductor, the load box and the check meter, reduces the abrasion of the physical socket, prolongs the service life of the equipment, and improves the working efficiency and the safety index of the verification process so as to meet the higher and higher requirements of the development of a distribution network on the verification work of the three-phase combined mutual inductor.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention.
Fig. 1 is a schematic block diagram of the present invention.
Fig. 2 is a circuit diagram of a portion of an assay circuit of the present invention.
Fig. 3 is another circuit diagram of a portion of the verification circuit of the present invention.
Fig. 4 is a wiring schematic diagram for current verification of a three-phase two-element combined transformer in the background art.
Fig. 5 is a schematic diagram of a current verification wiring of a three-phase three-element combined transformer in the background art.
Fig. 6 is a schematic diagram of a voltage verification wiring of a three-phase two-element combined transformer in the background art.
Fig. 7 is a schematic diagram of a voltage verification wiring of a three-phase three-element combined transformer in the background art.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
Fig. 1 shows a device for verifying automatic switching of secondary wiring for a program-controlled three-phase combined transformer, which comprises:
a junction box: the verification circuit comprises 3 current load boxes, 3 voltage load boxes and a plurality of relays, and each verification port of the verification circuit is connected with a connector used for plugging and unplugging a secondary voltage terminal and a secondary current terminal of the mutual inductor to be detected; a control device: and the control of the relay in the junction box is realized so as to realize the switching of the verification mode.
Connecting a check meter: is connected with the junction box;
connecting the secondary side of a standard transformer: and is connected with a calibrator through a junction box to provide measuring signals required by the verification.
It should be noted that the automatic switching device itself in the present invention does not include the secondary side of the calibration instrument and the standard transformer, and is a separate device and apparatus in the prior art.
Example 2
Based on the principle of the above embodiments, the present embodiment discloses a specific implementation manner.
The two terminal boxes comprise a first terminal box and a second terminal box, the verification port is arranged on the first terminal box, and the second terminal box is used for being connected with the secondary side of the standard transformer and the calibrator, so that the terminal box is convenient to wire, use and operate. It should be noted that the verification circuit of the present embodiment can be implemented in one terminal box, and this embodiment only provides a preferred manner, and it is within the scope of this embodiment to implement the verification circuit of the following embodiments by using one terminal box.
Specifically, the verification circuit in the first junction box may be implemented by using a circuit structure as shown in fig. 2. The verification ports of the first verification circuit comprise a port ax, a port bx, a port cx, a port nx, a port AS1, a port AS2, a port BS1, a port BS2, a port CS1 and a port CS2, 3 current load boxes of the first verification circuit comprise a first current load box Y1, a second current load box Y2 and a third current load box Y3, 3 voltage load boxes comprise a first voltage load box Za, a second voltage load box Zb and a third voltage load box Zc, the port bx is connected with the ground through a first relay S1, the first current load box, the second relay S2, the second current load box, a third relay S3, the third current load box and a fourth relay S4 are connected in series to form a closed loop, the port ax is connected with the common end of the first current load box and the fourth relay, and the common end of the first current load box and the second relay S5 is connected with the ground through a fifth relay S5, the common ends of the second current load box and the third relay are connected with the ground through a sixth relay S6, the common ends of the third current load box and the fourth relay are connected with the ground through a seventh relay S7, a port bx is connected with the common ends of the second relay and the second current load box, a port cx is connected with the common ends of the third relay and the third current load box, a port nx is grounded, and a port AS2, a port BS2 and a port CS2 are respectively connected with the first voltage load box, the second voltage load box and the third voltage load box.
One end of the first voltage load box is connected with the secondary side of the tested transformer, the other end of the first voltage load box is connected with the check meter, similarly, one ends of the second voltage load box and the third voltage load box are connected with the secondary side of the tested transformer, the other end of the second voltage load box and the third voltage load box are connected with the check meter, in order to enable the equipment to be connected neatly and not to be disordered, the connecting wire connected with the check meter is led out from the second junction box through the connecting wire, namely, the connecting wires such as TX1, TX2 and TX3 in figure 2.
The verification circuitry within the second junction box may be implemented using the circuit configuration shown in fig. 3. The second junction box comprises a port a2, a port b0, a port n0, a port x1, a port k1, a port x2, a port k2, a port x3, a port k3, a port D1, a port D2 and a port D3, wherein the port a2 is connected with the port b0 through an eighth relay S8, the twelfth relay S1, the fourteenth relay S1 and the sixteenth relay S1 are respectively connected between the port x1 and the port k1, the port x1 is connected with the port k1 through a tenth relay S1, the port k1 is connected with the port AS1 through a thirteenth relay S1, the port x1 is sequentially connected with the eleventh relay S1, the ninth relay S1 is connected with the port b 1, the eleventh relay and the ninth relay are simultaneously connected with the port n0, the port x1 is connected with the fifteenth relay S1, the port x1, the fifteenth relay S1 is connected with the port S1, the seventeenth relay S1, the port D1, the port D2 and the port D3 are all grounded.
The second junction box also comprises a plurality of connecting wires which lead the port connection in the first junction box to the secondary side of the calibrator and the standard transformer. The second junction box is connected with the calibration instrument, the secondary side of the standard transformer and the secondary side of the standard transformer. Such AS port a3 to port c0 connection, port T01 to port AS2 connection, port T02 to port BS2 connection, port T03 to port CS2 connection.
In the verification circuits in the first junction box and the second junction box, relays S1, S2, S3, S4, S5, S6, S7, S8, S9 and S10 control the on-off of the circuits, and two verification wiring modes of two elements and three elements are switched; connectors are connected to the verification port ax, the verification port bx, the verification port cx, the verification port nx, the verification port AS1, the verification port AS2, the verification port BS1, the verification port BS2, the verification port CS1 and the verification port CS2, and are connected with a secondary voltage terminal and a secondary current terminal of the transformer to be tested. The port TX1, the port TX2 and the port TX3 in the first junction box are connected into the check meter through the second junction box; the port ax, the port bx and the port cx are in butt joint with the voltage secondary side of the standard transformer and are also connected to the voltage secondary side of the standard transformer through a second junction box; the port AS1, the port BS1 and the port CS1 are in butt joint with the current secondary side of the standard transformer, and are also connected to the voltage secondary side of the standard transformer through a second junction box. In the second junction box, because the input terminals k1, k2 and k3 of the check meter are in a use state when the current transformer and the voltage transformer are checked, relays S11, S12, S13, S14, S15, S16 and S17 control the on-off of the circuit, and two checking modes of the current and the voltage are switched. In fig. 3, the lower terminals a0, b0, c0, n0, AS1, AS2, BS1, BS2, CS1 and CS2 are secondary voltage terminals and current terminal outgoing lines of a standard transformer, and are used for providing voltage signals and current signals for a check meter. In the figure, right terminals TX1, TX2, TX3, k1, k2, k3, T01, T02 and T03 are used for providing measurement signals required by verification of a current transformer for a calibrator; a1, a2, a3, x1, x2, x3, k1, k2, k3, D1, D2 and D3 are used for providing measurement signals required by the verification of the voltage transformer for the calibrator.
By adopting the circuit, the on-off conditions of the relay under different verification states when the mutual inductor is verified are as shown in table 1.
TABLE 1 Relay ON-OFF STATE OF VARIOUS TESTING
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. The utility model provides a device of programme-controlled formula three-phase combination mutual-inductor examination secondary wiring automatic switch-over which characterized in that includes:
a junction box: the verification circuit comprises 3 current load boxes, 3 voltage load boxes and a plurality of relays, and each verification port of the verification circuit is connected with a connector used for plugging and unplugging a secondary voltage terminal and a secondary current terminal of the mutual inductor to be detected;
a control device: the control of the relay in the junction box is realized so as to realize the switching of the verification mode;
the terminal box comprises a first terminal box and a second terminal box, and the verification port is arranged on the first terminal box;
the verification port comprises a port ax, a port bx, a port cx, a port nx, a port AS1, a port AS2, a port BS1, a port BS2, a port CS1 and a port CS2, the port bx is connected with the ground through a first relay, a first current load box, a second relay, a second current load box, a third relay, a third current load box and a fourth relay of the verification circuit in the first junction box are connected in series to form a closed loop, the port ax is connected to the common ends of the first current load box and the fourth relay, the common ends of the first current load box and the second relay are connected with the ground through a fifth relay, the common ends of the second current load box and the third relay are connected with the ground through a sixth relay, the common ends of the third current load box and the fourth relay are connected with the ground through a seventh relay, the port bx is connected with the second relay, the third relay and the fourth relay, The common end of the second current load box is connected, the port cx is connected with the common ends of the third relay and the third current load box, the port nx is grounded, and the port AS2, the port BS2 and the port CS2 are respectively connected with the first voltage load box, the second voltage load box and the third voltage load box.
2. The device for verifying automatic switching of secondary wiring of the program-controlled three-phase combined transformer according to claim 1, wherein the second junction box comprises a port a2, a port b0, a port n0, a port x1, a port k1, a port x2, a port k2, a port x3, a port k3, a port D1, a port D2 and a port D3, the port a2 is connected with the port b0 through an eighth relay, a twelfth relay, a fourteenth relay and a sixteenth relay are respectively connected between the port x1 and the port k1, the port x2 and the port k2, the port x3 and the port k3, the port x1 is connected with the port x3 and connected with the port n0 through a tenth relay, the port k1 is connected with the port AS1 through a thirteenth relay, and the port x2 is connected with the eleventh relay, the ninth relay and the eleventh relay through a port b0 in sequence, The common terminal of the ninth relay is simultaneously connected with the port x3, the port k2 is connected with the port BS1 through the fifteenth relay, the port k3 is connected with the port CS1 through the seventeenth relay, and the port D1, the port D2 and the port D3 are all grounded.
3. The apparatus for verifying automatic switching of secondary connection of a programmable three-phase combined transformer according to claim 1, wherein the second junction box further comprises a plurality of extension connection lines.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810789963.2A CN108896950B (en) | 2018-07-18 | 2018-07-18 | Automatic switching device for verifying secondary wiring of program-controlled three-phase combined transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810789963.2A CN108896950B (en) | 2018-07-18 | 2018-07-18 | Automatic switching device for verifying secondary wiring of program-controlled three-phase combined transformer |
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| CN108896950A CN108896950A (en) | 2018-11-27 |
| CN108896950B true CN108896950B (en) | 2020-01-07 |
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| CN109375140A (en) * | 2018-11-30 | 2019-02-22 | 国网安徽省电力有限公司滁州供电公司 | A kind of voltage transformer calibrating installation |
| CN113655429B (en) * | 2021-09-16 | 2024-08-09 | 国网四川省电力公司营销服务中心 | Auxiliary system and method for checking combined type power distribution network transformer |
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