CN108776252B - Metering secondary current loop of main transformer - Google Patents
Metering secondary current loop of main transformer Download PDFInfo
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- CN108776252B CN108776252B CN201810325882.7A CN201810325882A CN108776252B CN 108776252 B CN108776252 B CN 108776252B CN 201810325882 A CN201810325882 A CN 201810325882A CN 108776252 B CN108776252 B CN 108776252B
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- 238000005259 measurement Methods 0.000 claims abstract description 94
- 238000004804 winding Methods 0.000 claims abstract description 82
- 238000005265 energy consumption Methods 0.000 claims abstract description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 230000001502 supplementing effect Effects 0.000 abstract description 5
- 239000013589 supplement Substances 0.000 description 4
- 230000005611 electricity Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
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Abstract
The invention provides a metering secondary current loop of a main transformer. The metering secondary current loop of the main transformer is connected in series with the current loop of the electric energy meter to be connected into the measuring current wiring loop of the current transformer measuring secondary winding and the microcomputer protection measuring and controlling device, so that the measurement of the load current of the main transformer is realized, and the metering of the high-voltage and low-voltage load energy of the main transformer is realized. The intelligent management system realizes the lean management of the main transformer energy consumption, and when all or a certain line of the feed-out line switch cabinet has metering faults, the electric charge can be calculated and compared through the electric quantity reference meter of the main transformer, and the intelligent management system can be used as the basis for supplementing the electric charge, so that the economic loss of metering energy consumption leakage meter of a power supply enterprise is avoided. And furthermore, corresponding measures are taken according to the measurement of the loss of the main transformer, so that the electric quantity compensation after the leakage of the electric energy measurement fault of the feed-out line is realized, the electric charge is further compensated, and the lean management of the loss of the main transformer is realized.
Description
Technical Field
The invention relates to the technical field of secondary current metering of a transformer substation electric energy meter, in particular to a metering secondary current loop of a main transformer.
Background
The transformer is very important power supply equipment of a transformer substation, and protection and measurement of the transformer are realized through secondary current loops of current transformers at the high side and the low side of the transformer. The secondary windings of the current transformers at the high and low sides of the transformer are three basic secondary windings which are respectively used for a differential protection loop, an overcurrent protection loop and a measuring loop, and the main transformer protection screen and the high and low voltage switch cabinets are respectively positioned in a control room and a switch room. At present, electric energy meters are not arranged on the high-voltage side and the low-voltage side of a main transformer of a large multi-transformer power station to meter, the total amount of incoming line electric energy in the station is metered only through the electric energy meters arranged on the high-voltage incoming line switch cabinets of the switch rooms, and the electric energy metering of users of all the outgoing lines is respectively realized through the electric energy meters arranged on all the outgoing line switch cabinets, so that the loss of the main transformer cannot be metered, the lean management of the energy consumption of the main transformer cannot be realized, and when all or a certain outgoing line of the outgoing line switch cabinets is in metering failure, the electric charge cannot be calculated and compared through the electric energy reference meter metered by the main transformer, the basis of electricity supplement and electricity charge supplement is lacked, and the electric energy metering is omitted for power supply enterprises.
Disclosure of Invention
The invention aims to provide a metering secondary current loop of a main transformer, which can measure the high-voltage and low-voltage energy consumption of the main transformer while measuring the load current of the main transformer.
In order to solve the technical problems, the invention discloses the following technical scheme:
A metering secondary current loop for a main transformer is provided. The metering secondary current loop of the main transformer comprises a current transformer arranged on a high-voltage side or a low-voltage side of the main transformer, and is characterized in that a wiring terminal of an output current of a phase secondary measurement winding of the current transformer and a wiring terminal of an output current of a phase secondary measurement winding of a C phase are respectively connected to an A phase wiring terminal of an electric energy meter for inputting current and a C phase wiring terminal of the electric energy meter for inputting current, the A phase wiring terminal of the electric energy meter for outputting current and the C phase wiring terminal of the electric energy meter for outputting current are respectively connected to an A phase wiring terminal of an input current of a microcomputer protection measurement and control device and a C phase wiring terminal of the microcomputer protection measurement and control device for outputting current, and the A phase wiring terminal of the output current and the C phase wiring terminal of the output current are respectively connected to a grounding wiring terminal of the secondary measurement winding of the current transformer, wherein the wiring terminal of the input current of the phase secondary measurement winding of the current transformer and the wiring terminal of the input current of the phase secondary measurement winding of the C phase are respectively connected to the grounding wiring terminal of the secondary measurement winding of the current transformer;
The wiring terminal of the output current of the current transformer B-phase secondary measurement winding is connected to the B-phase wiring terminal of the microcomputer protection measurement and control device for inputting current, the B-phase wiring terminal of the microcomputer protection measurement and control device for outputting current is connected to the grounding wiring terminal of the current transformer secondary measurement winding, and the wiring terminal of the input current of the current transformer B-phase secondary measurement winding is connected to the grounding wiring terminal of the current transformer secondary measurement winding.
The metering secondary current loop of the main transformer also comprises a current connecting terminal group.
For the metering secondary current loop of the main transformer, the wiring terminal of the output current of the A-phase secondary measuring winding of the current transformer is connected to the first current wiring terminal in the current wiring terminal group and then connected to the A-phase wiring terminal for inputting current of the electric energy meter.
For the metering secondary current loop of the main transformer, a wiring terminal of the output current of the phase A secondary measuring winding of the current transformer is connected to a first current wiring terminal in a current wiring terminal group through a wire, wherein the wire is a single-strand copper wire with the cross section of 2.5mm 2; and/or the A-phase connection terminal of the electric energy meter for outputting current is connected to a fourth current connection terminal in the current connection terminal group, and then is connected with the A-phase connection terminal of the microcomputer protection measurement and control device for inputting current.
For the metering secondary current loop of the main transformer, a connecting terminal of the C-phase secondary measuring winding of the current transformer is connected to a third current connecting terminal in the current connecting terminal group and then connected to a C-phase connecting terminal of the electric energy meter for inputting current.
For the metering secondary current loop of the main transformer, a wiring terminal of the output current of the C-phase secondary measurement winding of the current transformer is connected to a third current wiring terminal in the current wiring terminal group through a wire, wherein the wire is a single-strand copper wire with the cross section of 2.5mm 2; and/or the C-phase terminal for outputting current of the electric energy meter is connected to a sixth current terminal in the current terminal group, and then is connected with the C-phase terminal for inputting current of the microcomputer protection measurement and control device.
For the metering secondary current loop of the main transformer, a wiring terminal of the B-phase secondary measuring winding of the current transformer is connected to a second current wiring terminal in the current wiring terminal group, and is connected to a B-phase wiring terminal of the microcomputer protection measuring and controlling device for inputting current through the second current wiring terminal.
For the metering secondary current loop of the main transformer, a wiring terminal of the output current of the B-phase secondary measurement winding of the current transformer is connected to a second current wiring terminal in the current wiring terminal group through a wire, wherein the wire is a single-strand copper wire with the cross section of 2.5mm 2; and/or the second current connecting terminal is connected to a B-phase connecting terminal of the microcomputer protection measurement and control device for inputting current through a fifth current connecting terminal in the current connecting terminal group.
For the metering secondary current loop of the main transformer, an A-phase connection terminal of the microcomputer protection measurement and control device for outputting current is connected with a seventh current connection terminal in the current connection terminal group, a B-phase connection terminal of the microcomputer protection measurement and control device for outputting current is connected with an eighth current connection terminal in the current connection terminal group, and a C-phase connection terminal of the microcomputer protection measurement and control device for outputting current is connected with a ninth current connection terminal in the current connection terminal group, wherein the seventh current connection terminal, the eighth current connection terminal and the ninth current connection terminal are connected to a grounding connection terminal of a secondary measurement winding of the current transformer after being in short circuit.
For the secondary current loop of the main transformer, the connecting terminal of the secondary measuring winding output current of the current transformer and the connecting terminal of the primary winding input current are homopolar ends.
The technical scheme of the invention has the main advantages that:
The metering secondary current loop of the main transformer is connected in series with the measuring current wiring loop of the current transformer measuring secondary winding and the microcomputer protection measuring and controlling device through the current loop of the electric energy meter, so that the measurement of the load current of the main transformer is realized, and the metering of the high-voltage load energy and the low-voltage load energy of the main transformer is realized. The intelligent control system realizes lean management of the main transformer energy consumption, and when metering faults occur in all or a certain feed-out line of the feed-out line switch cabinet, the electric charge can be calculated and compared through the electric energy reference meter metered by the main transformer, the intelligent control system can be used as a basis for supplementing and metering electric quantity and further supplementing and charging electric charge, and the economic loss of metering energy consumption leakage meter of a power supply enterprise is avoided. And furthermore, corresponding measures are taken according to the measurement of the loss of the main transformer, so that the electric charge compensation after the leakage of the electric energy measurement fault of the feed-out line and the lean management of the loss of the main transformer are realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is an exemplary prior art secondary measurement current loop for a typical main transformer;
Fig. 2 is a schematic diagram of a primary transformer metering secondary current loop according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention and the corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terms first, second and the like in the description and in the claims and in the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in other sequences than those illustrated herein.
Fig. 1 illustrates a typical prior art secondary measuring current loop of a main transformer, as exemplified by one of the high voltage side or the low voltage side of the main transformer. As shown in fig. 1, the secondary measuring current loop of the main transformer includes a current transformer provided at a high voltage side or a low voltage side of the main transformer, connection terminals a411, B411 and C411 of the output currents of the A, B and C three-phase secondary measuring windings 1TAa, 1TAb and 1TAc of the current transformer are connected to connection terminals A7, A9 and a11 of the microcomputer protection measuring and controlling device for inputting currents through the current connection terminals 1D7, 1D8 and 1D9, respectively, connection terminals A8, a10 and a12 of the microcomputer protection measuring and controlling device for outputting currents are connected to the current connection terminals 1D10, 1D11 and 1D12, respectively, and the current connection terminals 1D10, 1D11 and 1D12 are connected in parallel and are connected to a ground connection terminal N411 of the secondary measuring winding of the current transformer. The A, B of the current transformer and the connection terminals of the input currents of the three-phase C secondary measurement windings 1TAa, 1TAb and 1TAc are connected in parallel and then connected to the grounding connection terminal N411 of the current transformer measurement winding. The load current measuring function of the main transformer on the microcomputer protection measuring and controlling device is realized.
Therefore, the electric energy meters are not arranged on the high-voltage side and the low-voltage side of the main transformer in the existing transformer substation for metering, the metering of the total amount of the incoming electric energy in the transformer substation is realized only through the electric energy meters arranged on the high-voltage incoming switch cabinets, the metering of the user electric energy of each feeding line is respectively realized through the electric energy meters arranged on the feeding line switch cabinets, so that the loss of the main transformer cannot realize metering, the lean management of the energy consumption of the main transformer cannot be realized, and when all or one of the feeding line switch cabinets of the transformer substation or the incoming power switch cabinets have metering faults, the checking and the comparison of the electric charge cannot be performed through the reference meters arranged on the two sides of the main transformer, the basis of the electric charge supplement and the electric charge supplement is lacked, and the electric energy metering leakage is caused for the power supply enterprises. Therefore, aiming at the problem, a metering secondary current loop of the main transformer is provided, the problem of missing meter when the metering fault of the electric energy of the feed-out line occurs is effectively solved, the electric quantity compensation and further the electric charge compensation are realized, and the lean management is realized for the loss of the main transformer.
Fig. 2 shows a metered secondary current loop of a main transformer according to one embodiment of the present invention, wherein one of the high voltage side or the low voltage side of the main transformer is taken as an example. As shown in fig. 2, the metering secondary current loop of the main transformer provided by this embodiment includes a current transformer disposed at the high voltage side or the low voltage side of the main transformer. The wiring terminal A411 of the output current of the current transformer A-phase secondary measurement winding 1TAa and the wiring terminal C411 of the output current of the C-phase secondary measurement winding 1TAc are respectively connected to an A-phase wiring terminal ① for input current and a C-phase wiring terminal ⑦ for input current of the electric energy meter, the A-phase wiring terminal ③ for output current and the C-phase wiring terminal ⑨ for output current of the electric energy meter are respectively connected to an A-phase wiring terminal A7 for input current and a C-phase wiring terminal A11 for input current of the microcomputer protection measurement and control device, and the A-phase wiring terminal A8 for output current and the C-phase wiring terminal A12 for output current of the microcomputer protection measurement and control device are both connected to a grounding wiring terminal N411 of the current transformer secondary measurement winding. The connection terminal of the current transformer A-phase secondary measurement winding 1TAa for inputting current and the connection terminal of the C-phase secondary measurement winding 1TAc for inputting current are both connected to the grounding connection terminal N411 of the current transformer secondary measurement winding.
The wiring terminal B411 of the output current of the current transformer B-phase secondary measurement winding 1TAb is connected to the B-phase wiring terminal A9 of the microcomputer protection measurement and control device for inputting current, and the B-phase wiring terminal A10 of the microcomputer protection measurement and control device for outputting current is connected to the grounding wiring terminal N411 of the current transformer secondary measurement winding. The connection terminal of the current transformer B-phase secondary measurement winding 1TAb for inputting current is connected to the grounding connection terminal N411 of the current transformer B-phase secondary measurement winding.
Further, the metering secondary current loop of the main transformer provided by the embodiment further comprises a current wiring terminal group.
The connection terminal a411 of the current transformer a phase secondary measuring output current of the winding 1TAa is connected to the first current connection terminal 1D7 of the current connection terminal group through a wire, and then connected to the a phase connection terminal ① for input current of the electric energy meter. Wherein the wire is a single strand copper wire having a cross-sectional area of 2.5mm 2. The A-phase connection terminal ③ of the electric energy meter for outputting current is connected to the fourth current connection terminal 1D15 in the current connection terminal group, then is connected with the A-phase connection terminal A7 of the microcomputer protection measurement and control device for inputting current, the A-phase connection terminal A8 of the microcomputer protection measurement and control device for outputting current is connected with the seventh current connection terminal 1D10 in the current connection terminal group, and finally is connected to the grounding connection terminal N411 of the secondary measurement winding of the current transformer. The connection terminal of the input current of the current transformer a-phase secondary measurement winding 1TAa is connected to the grounding connection terminal N411 of the current transformer secondary measurement winding.
The connection terminal C411 of the output current of the secondary measuring winding 1TAc of the current transformer C phase is connected to the third current connection terminal 1D9 in the current connection terminal group through a wire, and then connected to the C-phase connection terminal ⑦ of the electric energy meter for inputting current. Wherein the wire is a single strand copper wire having a cross-sectional area of 2.5mm 2. The C-phase terminal ⑦ of the electric energy meter for outputting current is connected to a sixth current connecting terminal 1D17 in the current connecting terminal group, then is connected with a C-phase terminal A11 of the microcomputer protection measuring and controlling device for inputting current, the C-phase terminal A12 of the microcomputer protection measuring and controlling device for outputting current is connected with a ninth current connecting terminal 1D12 in the current connecting terminal group, and finally is connected with a seventh current connecting terminal 1D10 in the current connecting terminal group in parallel to a grounding connecting terminal N411 of a secondary measuring winding of the current transformer. The connection terminal of the input current of the current transformer C-phase secondary measurement winding 1TAc is connected to the grounding connection terminal N411 of the current transformer secondary measurement winding.
The connection terminal B411 of the output current of the current transformer B-phase secondary measurement winding 1TAb is connected to a second current connection terminal 1D8 in the current connection terminal group through a wire, and the second current connection terminal 1D8 is connected to a fifth current connection terminal 1D16 in the current connection terminal group and then connected to a B-phase connection terminal A9 of the microcomputer protection measurement and control device for inputting current. Wherein the wire is a single strand copper wire having a cross-sectional area of 2.5mm 2. The B-phase connecting terminal A10 of the microcomputer protection measuring and controlling device for outputting current is connected with the eighth current connecting terminal 1D11 in the current connecting terminal group, and finally is connected with the seventh current connecting terminal 1D10 and the ninth current connecting terminal 1D12 in the current connecting terminal group in parallel and then is connected to the grounding connecting terminal N411 of the secondary measuring winding of the current transformer. The connection terminal of the input current of the current transformer B-phase secondary measurement winding 1TAb is connected to the ground connection terminal N411 of the current transformer secondary measurement winding.
The seventh current connecting terminal 1D10, the eighth current connecting terminal 1D11 and the ninth current connecting terminal 1D12 in the current connecting terminal set are short-circuited, for example, by a metal connecting sheet, and then connected to the grounding connecting terminal N411 of the secondary measuring winding of the current transformer through a wire.
The electric energy meter is a three-phase two-element multifunctional electric energy meter.
The secondary measuring current string of the current transformer is connected into the current loop of the electric energy meter, and after being connected with the microcomputer protection measuring and controlling device to measure the current loop, the three-phase secondary current loop is short-circuited and grounded, and only can be grounded at one point.
When the current loop of the electric energy meter is connected, the connection terminals of the primary winding and the secondary winding of the current transformer are marked with the same polarity according to the polarity-reducing marking principle of the current transformer, namely, when the primary winding flows into the primary current from the primary current connection terminal marked with the same polarity terminal, the secondary current induced in the secondary winding flows out from the secondary current connection terminal marked with the same polarity terminal. If the primary current of the current transformer flows in from P1 and flows out from P2, the secondary current of the A phase flows out from S1 marked as the same name end with P1, enters an A phase connecting terminal ① of the electric energy meter for inputting current, flows out from an A phase connecting terminal ③ of the electric energy meter for outputting current, enters an A phase connecting terminal A7 of the microcomputer protection measuring and controlling device for inputting current, and finally flows out from an A phase connecting terminal A8 of the microcomputer protection measuring and controlling device for outputting current to the S2 end of the A phase secondary measuring winding; similarly, the secondary current of the C phase flows out from the same-name end S1 marked as P1, enters the C phase current connecting terminal ⑦ of the electric energy meter for inputting current, flows out from the C phase connecting terminal ⑨ of the electric energy meter for outputting current, enters the C phase connecting terminal A11 of the microcomputer protection measuring and controlling device for inputting current, and finally flows out from the C phase connecting terminal A12 of the microcomputer protection measuring and controlling device for outputting current to the S2 end of the C phase secondary measuring winding. Wherein, P1 and S1 are the same name (polarity) terminals, and are marked by a symbol ". Times..
The working principle and working process of the metering secondary current loop of the main transformer of the embodiment are as follows: the A-phase and C-phase secondary measuring currents output by the measuring winding of the current transformer are respectively connected to an A-phase and C-phase two-phase current loop of the electric energy meter through a first current connecting terminal 1D7 and a third current connecting terminal 1D9 in the current connecting terminal group, respectively flow out to a fourth current connecting terminal 1D15 and a sixth current connecting terminal 1D17 in the current connecting terminal group through an A-phase secondary measuring current connecting terminal A7 and a C-phase secondary measuring current connecting terminal A11 in the microcomputer protection measuring and controlling device, respectively output to a seventh current connecting terminal 1D10 and a ninth current connecting terminal 1D12 in the current connecting terminal group through an A-phase secondary measuring current connecting terminal A8 and a C-phase secondary measuring current connecting terminal A12 in the microcomputer protection measuring and controlling device, respectively, are short-circuited to a seventh current connecting terminal 1D10 and a ninth current connecting terminal 1D12 in the current connecting terminal group, and finally are connected to the grounding transformer secondary winding connecting terminal 411; the second current terminal 1D8 in the current terminal group is connected to the fifth current terminal 1D16 in the current terminal group, then connected to the B-phase terminal A9 for inputting current of the microcomputer protection measurement and control device, the B-phase secondary measurement current terminal A10 for outputting current through the microcomputer protection measurement and control device is output and connected to the eighth current terminal 1D11 in the current terminal group, the eighth current terminal 1D11 in the current terminal group is short-circuited and connected with the seventh current terminal 1D10 and the ninth current terminal 1D12 in the current terminal group, and finally connected to the secondary measurement winding grounding terminal N411 of the current transformer.
It should be noted that, a voltage transformer is further provided on a bus where the switch cabinet at the high voltage side and/or the low voltage side of the main transformer is located, three-phase voltages Ua, ub and Uc from the secondary measurement voltage windings of the voltage transformer need to be correctly connected to three-phase secondary voltage connection terminals ②、⑤ and ⑧ of the electric energy meter, respectively, and a secondary voltage loop of the electric energy meter is not shown in the figure.
The metering secondary current loop of the main transformer is connected in series with the current loop of the electric energy meter to be connected into the secondary winding for measuring and the current wiring loop for measuring by the microcomputer protection measuring and controlling device, so that the load current of the main transformer is measured, and the energy consumption of the high and low voltage sides of the main transformer is measured. The intelligent management system realizes lean management of the energy consumption of the main transformer, and when metering faults occur in all or a certain line of the feed-out line switch cabinet, the electric charge can be calculated and compared through the reference meter metered by the main transformer, so that the intelligent management system can be used as a basis for supplementing the electric quantity and further supplementing the electric charge, and the loss of metering energy consumption of power supply enterprises is avoided.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. The metering secondary current loop of the main transformer comprises a current transformer arranged on a high-voltage side or a low-voltage side of the main transformer, and is characterized in that a wiring terminal (A411) of an output current of a phase secondary measurement winding (1 TAa) of the current transformer and a wiring terminal (C411) of an output current of a phase secondary measurement winding (1 TAc) of the current transformer are respectively connected to an A phase wiring terminal (①) of an electric energy meter and a C phase wiring terminal (⑦) of the input current, an A phase wiring terminal (③) of the electric energy meter and a C phase wiring terminal (⑨) of the output current are respectively connected to an A phase wiring terminal (A7) of the microcomputer protection measurement and control device and a C phase wiring terminal (A11) of the input current, and an A phase wiring terminal (A8) of the microcomputer protection measurement and control device and a C phase wiring terminal (A12) of the output current are respectively connected to a grounding terminal (N411) of the secondary measurement winding of the current transformer, wherein the A phase wiring terminal (③) of the current transformer and the C phase terminal (TAc) of the phase secondary measurement winding (1) of the microcomputer protection measurement and the input current winding (TAc) are respectively connected to a wiring terminal (A) of the microcomputer protection measurement and the secondary winding of the microcomputer protection measurement and the input winding (TAc);
The wiring terminal (B411) of the output current of the current transformer B-phase secondary measurement winding (1 TAb) is connected to the B-phase wiring terminal (A9) of the microcomputer protection measurement and control device for inputting current, the B-phase wiring terminal (A10) of the microcomputer protection measurement and control device for outputting current is connected to the grounding wiring terminal (N411) of the current transformer B-phase secondary measurement winding, wherein the wiring terminal of the input current of the current transformer B-phase secondary measurement winding (1 TAb) is connected to the grounding wiring terminal (N411) of the current transformer B-phase secondary measurement winding;
the current loop of the electric energy meter is connected in series to the secondary winding of the current transformer and the current wiring loop of the microcomputer protection measurement and control device, so that the measurement of the load current of the main transformer is realized, and the measurement of the energy consumption of the high-voltage side or the low-voltage side of the main transformer is realized;
The current connecting terminal group is also included;
the wiring terminal (A411) of the output current of the current transformer A-phase secondary measurement winding (1 TAa) is connected to a first current wiring terminal (1D 7) in the current wiring terminal group, and then is connected to an A-phase wiring terminal (①) of the electric energy meter for inputting current;
The connection terminal (C411) of the output current of the secondary measuring winding (1 TAc) of the C phase of the current transformer is connected to a second current connection terminal (1D 9) in the current connection terminal group and then connected to a C phase connection terminal (⑦) of the electric energy meter for inputting current.
2. The metering secondary current loop of a main transformer according to claim 1, characterized in that the connection terminal (a 411) of the output current of the current transformer a-phase secondary measurement winding (1 TAa) is connected to the first current connection terminal (1D 7) of the current connection terminal set by a wire, wherein the wire is a single strand copper wire with a cross-sectional area of 2.5mm 2; and/or
The A-phase connecting terminal (③) of the electric energy meter for outputting current is connected to a fourth current connecting terminal (1D 15) in the current connecting terminal group, and then is connected with an A-phase connecting terminal (A7) of the microcomputer protection measurement and control device for inputting current.
3. The metering secondary current loop of a main transformer according to claim 1, characterized in that the connection terminal (C411) of the output current of the current transformer C-phase secondary measurement winding (1 TAc) is connected to the second current connection terminal (1D 9) of the current connection terminal set by a wire, wherein the wire is a single strand copper wire with a cross-sectional area of 2.5mm 2; and/or
The C-phase connecting terminal (⑦) of the electric energy meter for outputting current is connected to a sixth current connecting terminal (1D 17) in the current connecting terminal group, and then is connected with a C-phase connecting terminal (A11) of the microcomputer protection measurement and control device for inputting current.
4. The metering secondary current loop of a main transformer according to claim 1, characterized in that the connection terminal (B411) of the output current of the current transformer B-phase secondary measurement winding (1 TAb) is connected to a second current connection terminal (1D 8) of the current connection terminal set, via the second current connection terminal (1D 8) to a B-phase connection terminal (A9) of the microcomputer protection measurement and control device for the input current.
5. The metered secondary current loop of a main transformer according to claim 4, characterized in that the connection terminal (B411) of the output current of the current transformer B-phase secondary measurement winding (1 TAb) is connected to the second current connection terminal (1D 8) of the current connection terminal set by a wire, wherein the wire is a single strand copper wire with a cross-sectional area of 2.5mm 2; and/or
The second current connection terminal (1D 8) is connected to a B-phase connection terminal (A9) of the microcomputer protection measurement and control device for inputting current through a fifth current connection terminal (1D 16) in the current connection terminal group.
6. The metering secondary circuit of a main transformer according to claim 1, characterized in that an a-phase connection (A8) for the output current of the microcomputer protection measurement and control device is connected to a seventh current connection (1D 10) of the current connection set, a B-phase connection (a 10) for the output current of the microcomputer protection measurement and control device is connected to an eighth current connection (1D 11) of the current connection set, and a C-phase connection (a 12) for the output current of the microcomputer protection measurement and control device is connected to a ninth current connection (1D 12) of the current connection set, wherein the seventh current connection (1D 10), the eighth current connection (1D 11) and the ninth current connection (1D 12) are short-circuited and then connected to a ground connection (N411) of the secondary measuring winding of the current transformer.
7. The secondary current loop of claim 1 wherein the terminal of the secondary winding output current measurement of the current transformer and the terminal of the primary winding input current are of the same polarity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810325882.7A CN108776252B (en) | 2018-04-12 | 2018-04-12 | Metering secondary current loop of main transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810325882.7A CN108776252B (en) | 2018-04-12 | 2018-04-12 | Metering secondary current loop of main transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108776252A CN108776252A (en) | 2018-11-09 |
| CN108776252B true CN108776252B (en) | 2024-05-28 |
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