CN208297591U - The metering secondary current circuit of main transformer - Google Patents
The metering secondary current circuit of main transformer Download PDFInfo
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- CN208297591U CN208297591U CN201820516540.9U CN201820516540U CN208297591U CN 208297591 U CN208297591 U CN 208297591U CN 201820516540 U CN201820516540 U CN 201820516540U CN 208297591 U CN208297591 U CN 208297591U
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Abstract
The utility model provides a kind of metering secondary current circuit of main transformer.The metering secondary current circuit of the main transformer is by accessing the measurement electric current connection circuit that current transformer measures secondary winding and microcomputer protecting controller for electric energy meter current circuit in series; while realizing to the measurement of main transformer load current, the metering to main transformer high and low pressure load energy is realized.Realize the lean management to main transformer energy, and when there is metering fault in a whole or a certain routes for outgoing switchgear, the accounting of the electricity charge can be carried out by the electricity reference table of main transformer self-metering, compared, the foundation that can be used as the subsequent collection electricity charge avoids the economic loss of power supply enterprise's metering energy consumption leakage meter.In turn, according to the metering of the loss to main transformer itself, corresponding measure is taken, electricity mends meter, in turn electricity charge subsequent collection and realizes the lean management to main transformer own loss after realizing the leakage meter for feeding out route electrical energy measurement failure.
Description
Technical field
The utility model relates to substation electric energy meter secondary current field of measuring techniques more particularly to a kind of main transformers
Measure secondary current circuit.
Background technique
Transformer is the very important power supply unit of substation, and the protection and measurement of transformer are all by transformer height
The secondary current circuit of the current transformer of low pressure two sides is realized.Transformer high-low-voltage two sides current transformer it is secondary around
Group is generally three basic secondary windings, is respectively used to differential protection loop, overcurrent protection circuit and measurement circuit, and main transformer
Protection screen and high and low voltage switchgear are located at control room and switch gear room.Currently, the high-low pressure of the main transformer of big multi-Substation
Two sides are not installed electric energy meter and are measured, simply by the electric energy meter installed on switch gear room's high-voltage lead-in switch cabinet realize in station into
The metering of line electric energy total amount, and the electric energy meter by installing on each outgoing switchgear realize that feeding out route to each item uses respectively
The metering of family electric energy, the loss of such main transformer itself cannot achieve metering, can not achieve the lean to main transformer energy
Change management, and when whole or a certain items of outgoing switchgear feed out route and metering fault occur, main transformer pressure can not be passed through
The electric energy reference table of device self-metering carries out the accounting of the electricity charge, compares, and lacks the foundation for mending quantity calculation and then the subsequent collection electricity charge, gives
Power supply enterprise causes the leakage meter of electrical energy measurement.
Summary of the invention
The technical problem to be solved by the present invention is to provide one kind to main transformer load current measure while energy
Enough metering secondary current circuits for using main transformer high and low pressure the main transformer that can be measured.
In order to solve the above-mentioned technical problem, the utility model discloses following technical solutions:
It is proposed a kind of metering secondary current circuit of main transformer.The metering secondary current circuit of the main transformer includes setting
It is placed in the current transformer of main transformer high-pressure side or low-pressure side, which is characterized in that current transformer A phase double measurement winding
The connecting terminal for exporting the connecting terminal of electric current and the output electric current of C phase double measurement winding is respectively connected to being used for for electric energy meter
The A for exporting electric current of line terminals that the A of input current connects line terminals and the C for input current connects, electric energy meter connects
Line terminals and C for exporting the electric current line terminals that connect are respectively connected to the A for input current of microcomputer protecting controller
The line terminals that connect and C for input current connect line terminals, microcomputer protecting controller for exporting the A phase connection of electric current
Terminal and C for exporting the electric current line end that connects are connected to the ground connection connecting terminal of Current Transformer Secondary measurement winding,
In, the input current of the connecting terminal and C phase double measurement winding of the input current of current transformer A phase double measurement winding
Connecting terminal is connected to the ground connection connecting terminal of Current Transformer Secondary measurement winding；
The connecting terminal of the output electric current of current transformer B phase double measurement winding is connected to microcomputer protecting controller use
Connect line terminals in the B of input current, the B that microcomputer protecting controller is used to export electric current connects, and to be connected to electric current mutual for line terminals
The ground connection connecting terminal of sensor double measurement winding, wherein the wiring of the input current of current transformer B phase double measurement winding
Terminal is connected to the ground connection connecting terminal of Current Transformer Secondary measurement winding.
The metering secondary current circuit of above-mentioned main transformer further includes current terminal subgroup.
For the metering secondary current circuit of above-mentioned main transformer, the output electricity of current transformer A phase double measurement winding
The connecting terminal of stream is connected to the first current wiring terminal in current terminal subgroup, then be wired to electric energy meter for inputting
The A of electric current connects line terminals.
For the metering secondary current circuit of above-mentioned main transformer, the output electricity of current transformer A phase double measurement winding
The connecting terminal of stream is connected to the first current wiring terminal in current terminal subgroup by conducting wire, wherein conducting wire is transversal
Area is 2.5mm2Only strand of copper wire；And/or the A for exporting electric current of the electric energy meter line terminals that connect are connected to electric current and connect
The 4th current wiring terminal in line end subgroup, the A for input current for reconnecting microcomputer protecting controller connect line end
Son.
For the metering secondary current circuit of above-mentioned main transformer, the output electricity of current transformer C phase double measurement winding
The connecting terminal of stream is connected to the third current wiring terminal in current terminal subgroup, then be wired to electric energy meter for inputting
The C of electric current connects line terminals.
For the metering secondary current circuit of above-mentioned main transformer, the output electricity of current transformer C phase double measurement winding
The connecting terminal of stream is connected to the third current wiring terminal in current terminal subgroup by conducting wire, wherein conducting wire is transversal
Area is 2.5mm2Only strand of copper wire；And/or the C for exporting electric current of the electric energy meter line terminals that connect are connected to electric current and connect
The 6th current wiring terminal in line end subgroup, the C for input current for reconnecting microcomputer protecting controller connect line end
Son.
For the metering secondary current circuit of above-mentioned main transformer, the output electricity of current transformer B phase double measurement winding
The connecting terminal of stream is connected to the second current wiring terminal in current terminal subgroup, is connected by the second current wiring terminal
The B for input current to microcomputer protecting controller connects line terminals.
For the metering secondary current circuit of above-mentioned main transformer, the output electricity of current transformer B phase double measurement winding
The connecting terminal of stream is connected to the second current wiring terminal in current terminal subgroup by conducting wire, wherein conducting wire is transversal
Area is 2.5mm2Only strand of copper wire；And/or the second current wiring terminal passes through the 5th electricity in current terminal subgroup
The B for input current that stream connecting terminal is connected to microcomputer protecting controller connects line terminals.
For the metering secondary current circuit of above-mentioned main transformer, the A for being used to export electric current of microcomputer protecting controller
The line terminals that connect connect the 7th current wiring terminal in current terminal subgroup, and microcomputer protecting controller is used to export electricity
The B of stream connects the 8th current wiring terminal in line terminals connection current terminal subgroup, and microcomputer protecting controller is used for
Output electric current C connect line terminals connection current terminal subgroup in the 9th current wiring terminal, wherein the 7th electric current wiring
Terminal, the 8th current wiring terminal and the 9th current wiring terminal are wired to connecing for Current Transformer Secondary measurement winding after being shorted
Ground connecting terminal.
For the metering secondary current circuit of above-mentioned main transformer, Current Transformer Secondary measurement winding output current is connect
The connecting terminal of line terminals and first winding input current is homopolar end.
The major advantage of technical solutions of the utility model is as follows:
The metering secondary current circuit of main transformer is by accessing current transformer measurement for electric energy meter current circuit in series
The measurement electric current connection circuit of secondary winding and microcomputer protecting controller measures main transformer load current in realization same
When, realize the metering to main transformer high and low pressure load energy.Realize the lean management to main transformer energy, and when feedback
When whole or a certain items of outlet switch cabinet feed out route and metering fault occur, the electric energy of main transformer self-metering can be passed through
Reference table carries out the accounting of the electricity charge, compares, and can be used as the foundation for mending quantity calculation and then the subsequent collection electricity charge, avoids power supply enterprise
Measure the economic loss of energy consumption leakage meter.In turn, according to the metering of the loss to main transformer itself, corresponding measure is taken, is realized
It feeds out electricity charge subsequent collection after the leakage meter of route electrical energy measurement failure and realizes the lean management to main transformer own loss.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the utility model embodiment, constitutes the utility model
A part of embodiment is intended only as example and is used to explain the utility model embodiment, do not constitute and implement to the utility model
The improper restriction of example.In the accompanying drawings:
Fig. 1 is the double measurement current loop for the typical main transformer a kind of in the prior art that example provides；
Fig. 2 is the metering secondary current circuit for the main transformer that the utility model one embodiment provides.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Technical solutions of the utility model are clearly and completely described in type embodiment and corresponding attached drawing.Obviously, described implementation
Example is only the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, ability
It is practical new to belong to this for domain those of ordinary skill every other embodiment obtained without making creative work
The range of type protection.
Specification and claims and the (if present)s such as term " first " in above-mentioned attached drawing, " second " are for area
Not similar part, without being used to describe a particular order or precedence order.It should be understood that the data used in this way are appropriate
In the case of can be interchanged, so that embodiments herein described herein can be real with the sequence other than illustrating herein
It applies.
Fig. 1 is the double measurement current loop for the typical main transformer a kind of in the prior art that example provides, wherein with
For the high-pressure side of main transformer or the side in low-pressure side.As shown in Figure 1, the double measurement current loop of main transformer includes
It is set to the current transformer of main transformer high-pressure side or low-pressure side, A, B and C three-phase double measurement winding of current transformer
Connecting terminal A411, B411 and C411 of the output electric current of 1TAa, 1TAb and 1TAc respectively through current wiring terminal 1D7,1D8 and
1D9 is wired to microcomputer protecting controller connecting terminal A7, A9 and A11 for input current, through microcomputer protecting controller
Connecting terminal A8, A10 and A12 for exporting electric current be respectively connected to current wiring terminal 1D10,1D11 and 1D12, electric current
Connecting terminal 1D10,1D11 and 1D12 are connected in parallel and are wired to the ground connection connecting terminal of Current Transformer Secondary measurement winding
N411.Wherein, the terminals of the input current of A, B and C three-phase double measurement winding 1TAa, 1TAb and 1TAc of current transformer
After son is connected in parallel, it is then connected to the ground connection connecting terminal N411 of current transformer measurement winding.It realizes and is surveyed in Microcomputer Protection
Control the measurement function on device to main transformer load current.
As it can be seen that the high-low pressure two sides of main transformer are not installed electric energy meter and are measured in existing substation, simply by
The electric energy meter installed on high-voltage lead-in switch cabinet realizes the metering for interior inlet wire electric energy total amount of standing, by each outgoing switchgear
The electric energy meter of installing realizes the metering that line user electric energy is fed out to each item respectively, and the loss of such main transformer itself can not be real
It now measures, can not achieve the lean management to main transformer energy, and feed out the complete of line switching cabinet when substation is each
When there is metering fault in portion or one or incoming power switchgear, the self-metering that can not be installed by main transformer two sides
Reference table carry out the electricity charge accounting, compare, lack mend quantity calculation, and then the subsequent collection electricity charge foundation, cause electricity to power supply enterprise
The leakage meter that can be measured.Therefore, for this problem, the metering secondary current circuit for proposing a kind of main transformer, efficiently solves
Leakage meter problem when route electrical energy measurement failure is fed out, electricity is realized and mends meter and then electricity charge subsequent collection, and to main transformer pressure
Lean management is realized in device loss.
Fig. 2 is the metering secondary current circuit for the main transformer that the utility model one embodiment provides, wherein with main transformer
For the high-pressure side of depressor or the side in low-pressure side.As shown in Fig. 2, the secondary electricity of metering for the main transformer that the embodiment provides
Flowing back to road includes the current transformer for being set to main transformer high-pressure side or low-pressure side.Current transformer A phase double measurement winding
The connecting terminal C411 difference of the output electric current of the connecting terminal A411 and C phase double measurement winding 1TAc of the output electric current of 1TAa
1. and 7. the C for input current connects line terminals, electric energy meter the A for input current for being connected to electric energy meter connects line terminals
The A for exporting electric current 3. and 9. the line terminals that connect of the C for exporting electric current are respectively connected to Microcomputer Protection connect line terminals
The A for input current of the measure and control device line terminals A7 and C for input current that connects connects line terminals A11, Microcomputer Protection
The A for exporting electric current of the measure and control device line terminals A8 and C for the exporting electric current line end A12 that connects that connects is connected to electric current
The ground connection connecting terminal N411 of mutual inductor double measurement winding.Wherein, current transformer A phase double measurement winding 1TAa input electricity
The connecting terminal of stream and the connecting terminal of C phase double measurement winding 1TAc input current are connected to Current Transformer Secondary measurement
The ground connection connecting terminal N411 of winding.
The connecting terminal B411 of the output electric current of current transformer B phase double measurement winding 1TAb is connected to Microcomputer Protection survey
B of the control device for input current connects line terminals A9, and the B that microcomputer protecting controller is used to export electric current connects line terminals
A10 is connected to the ground connection connecting terminal N411 of Current Transformer Secondary measurement winding.Wherein, current transformer B phase double measurement
The connecting terminal of winding 1TAb input current is connected to the ground connection connecting terminal N411 of Current Transformer Secondary measurement winding.
Further, the metering secondary current circuit for the main transformer which provides further includes current wiring terminal
Group.
The connecting terminal A411 of the output electric current of current transformer A phase double measurement winding 1TAa passes through terminating wire to electricity
The first current wiring terminal 1D7 in terminals subgroup is flowed, then is wired to the A for input current of electric energy meter and connects line terminals
①.Wherein, it is 2.5mm that conducting wire, which is cross-sectional area,2Only strand of copper wire.3. the A for exporting electric current of electric energy meter connects line terminals
The 4th current wiring terminal 1D15 being connected in current terminal subgroup, reconnect microcomputer protecting controller for inputting
The A of electric current connects line terminals A7, and the A for exporting electric current of microcomputer protecting controller connects line terminals A8 connection electric current wiring
The 7th current wiring terminal 1D10 in terminal group is finally wired to the ground connection connecting terminal of Current Transformer Secondary measurement winding
N411.The connecting terminal of the input current of current transformer A phase double measurement winding 1TAa is connected to Current Transformer Secondary survey
Measure the ground connection connecting terminal N411 of winding.
The connecting terminal C411 of the output electric current of current transformer C phase double measurement winding 1TAc passes through terminating wire to electricity
The third current wiring terminal 1D9 in terminals subgroup is flowed, then is wired to the C for input current of electric energy meter and connects line terminals
⑦.Wherein, it is 2.5mm that conducting wire, which is cross-sectional area,2Only strand of copper wire.7. the C for exporting electric current of electric energy meter connects line terminals
The 6th current wiring terminal 1D17 being connected in current terminal subgroup, reconnect microcomputer protecting controller for inputting
The C of electric current connects line terminals A11, and the C for exporting electric current of the microcomputer protecting controller line terminals A12 connection electric current that connects connects
The 9th current wiring terminal 1D12 in line end subgroup, the 7th current wiring terminal 1D10 in last and current terminal subgroup
It is connected in parallel to the ground connection connecting terminal N411 of Current Transformer Secondary measurement winding.Current transformer C phase double measurement winding
The connecting terminal of the input current of 1TAc is connected to the ground connection connecting terminal N411 of Current Transformer Secondary measurement winding.
The connecting terminal B411 of the output electric current of current transformer B phase double measurement winding 1TAb passes through terminating wire to electricity
The second current wiring terminal 1D8 in terminals subgroup is flowed, the second current wiring terminal 1D8 is connected in current terminal subgroup
The 5th current wiring terminal 1D16, the B for input current for being then connected to microcomputer protecting controller connects line terminals A9.
Wherein, it is 2.5mm that conducting wire, which is cross-sectional area,2Only strand of copper wire.The B phase connection for being used to export electric current of microcomputer protecting controller
The 8th current wiring terminal 1D11 in terminal A10 connection current terminal subgroup, finally again and in current terminal subgroup
After 7th current wiring terminal 1D10 and the 9th current wiring terminal 1D12 is connected in parallel, it is then connected to Current Transformer Secondary survey
Measure the ground connection connecting terminal N411 of winding.The connecting terminal of the input current of current transformer B phase double measurement winding 1TAb connects
It is connected to the ground connection connecting terminal N411 of Current Transformer Secondary measurement winding.
Wherein, the 7th current wiring terminal 1D10 in current terminal subgroup, the 8th current wiring terminal 1D11 and
Nine current wiring terminal 1D12 are shorted, such as are shorted by metal connecting sheet, then are connected to Current Transformer Secondary through conducting wire and are surveyed
Measure the ground connection connecting terminal N411 of winding.
Wherein, electric energy meter is three-phase two elements multifunctional electric energy meter.
The double measurement electric current of current transformer concatenates the current loop into electric energy meter, reconnects microcomputer protecting controller
After measuring current loop, three-phase secondary current circuit should be shorted and be grounded, and can only one point earth.
In electric energy meter current circuit connection, according to current transformer subtractive polarity mark principle, to current transformer one,
Secondary winding connecting terminal carries out homopolar end mark, i.e., when first winding is from the primary current terminals for being labeled as homopolar end
When subflow enters primary current, the secondary current that induces in secondary winding is from the secondary current connecting terminal for being labeled as homopolar end
Outflow.If the primary current of current transformer is flowed into from P1 and is flowed out from P2, then the secondary current of A phase is marked from P1
It is flowed out for the S1 of Same Name of Ends, 1. the A into electric energy meter for input current connects line terminals, then from electric energy meter for exporting electric current
The A line terminals that connect 3. flow out, connect line terminals A7 into microcomputer protecting controller for the A of input current, finally from micro-
The A that machine protection supervisory equipment is used to the export electric current line terminals A8 that connects flows out to the end S2 of A phase double measurement winding；Similarly, C phase
Secondary current from P1 be labeled as Same Name of Ends S1 outflow, into electric energy meter for input current C phase current connecting terminal 7.,
It is 9. flowed out from the C line terminals that connect that electric energy meter is used to export electric current again, the C of input current is used for into microcomputer protecting controller
The line terminals that connect A11, finally connecting from the C that microcomputer protecting controller is used to export electric current, to flow out to C phase secondary by line terminals A12
Measure the end S2 of winding.Wherein, P1 and S1 is (polarity) of the same name end, is labeled with symbol " * ".
The working principle and the course of work in the metering secondary current circuit of the main transformer of the embodiment are as follows: Current Mutual Inductance
A phase and C phase double measurement electric current are respectively first through current wiring terminal in the three-phase double measurement electric current of the measurement winding output of device
The first current wiring terminal 1D7 and third current wiring terminal 1D9 in group are wired to the A phase and C phase biphase current of electric energy meter
Circuit connects through A phase inside electric energy meter and C phase biphase current coil, the 4th electric current flowed out in current terminal subgroup respectively
Line terminals 1D15 and the 6th current wiring terminal 1D17, then line is separately connected to microcomputer protecting controller for input current
A phase double measurement current wiring terminal A7 and C phase double measurement current wiring terminal A11 for input current, then distinguish
A phase the double measurement current wiring terminal A8 and the C for exporting electric current for being used to export electric current through microcomputer protecting controller
Phase double measurement current wiring terminal A12 exports the electricity of the 7th current wiring terminal 1D10 and the 9th into current terminal subgroup
Connecting terminal 1D12 is flowed, the 7th current wiring terminal 1D10 and the 9th current wiring terminal 1D12 in current terminal subgroup are short
After connecing in succession, it is finally wired to Current Transformer Secondary measurement winding earth connecting terminal N411；B phase double measurement electric current is through electricity
The second current wiring terminal 1D8 in stream terminals subgroup is connected to the 5th current wiring terminal in current terminal subgroup
1D16, the B for input current for being then connected to microcomputer protecting controller connects line terminals A9, through microcomputer protecting controller
B phase double measurement current wiring terminal A10 for exporting electric current exports the 8th electric current being connected in current terminal subgroup
Connecting terminal 1D11, the 8th current wiring terminal 1D11 in current terminal subgroup are shorted in connection current terminal subgroup
7th current wiring terminal 1D10 and the 9th current wiring terminal 1D12 is finally also wired to Current Transformer Secondary measurement winding
It is grounded connecting terminal N411.
It should be noted that being additionally provided on the bus where the high-pressure side of main transformer and/or the switchgear of low-pressure side
Voltage transformer, three-phase voltage Ua, Ub and the Uc come from the double measurement voltage winding of voltage transformer need to be accessed correctly respectively
2., 5. and 8., the secondary voltage circuit of electric energy meter is being not shown in the figure the three-phase secondary voltage connecting terminal of electric energy meter.
The metering secondary current circuit of main transformer is by accessing current transformer measurement for electric energy meter current circuit in series
Secondary winding and microcomputer protecting controller measure electric current connection circuit, measure in realization main transformer load current same
When, realize the metering to main transformer high and low pressure side energy.The lean management to main transformer energy is realized, and
When there is metering fault in a whole or a certain routes for outgoing switchgear, can by main transformer measure reference table into
The accounting of the row electricity charge compares, and can be used as the foundation for mending quantity calculation and then the subsequent collection electricity charge, avoids power supply enterprise's metering energy consumption
Loss.
Finally, it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations；
Although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that:
It is still possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is carried out etc.
With replacement；And these are modified or replaceed, various embodiments of the utility model technology that it does not separate the essence of the corresponding technical solution
The spirit and scope of scheme.
Claims (10)
1. a kind of metering secondary current circuit of main transformer, the electric current including being set to main transformer high-pressure side or low-pressure side are mutual
Sensor, which is characterized in that the connecting terminal (A411) and C of the output electric current of current transformer A phase double measurement winding (1TAa)
The connecting terminal (C411) of the output electric current of phase double measurement winding (1TAc) be respectively connected to electric energy meter for input current
A connect line terminals (1.) and the C for input current connects line terminals (7.), the A for exporting electric current of electric energy meter connects
Line terminals (3.) and the C for exporting electric current connect line terminals (9.) be respectively connected to microcomputer protecting controller for inputting
The A of electric current connects line terminals (A7) and the C for input current connects line terminals (A11), and microcomputer protecting controller is used for
The A of output electric current connects line terminals (A8) and the C for exporting electric current connects, and line end (A12) is connected to Current Transformer Secondary
Measure the ground connection connecting terminal (N411) of winding, wherein the input current of current transformer A phase double measurement winding (1TAa)
The connecting terminal of the input current of connecting terminal and C phase double measurement winding (1TAc) is connected to Current Transformer Secondary measurement
The ground connection connecting terminal (N411) of winding；
The connecting terminal (B411) of the output electric current of current transformer B phase double measurement winding (1TAb) is connected to Microcomputer Protection survey
Control device connects line terminals (A9) for the B of input current, and the B that microcomputer protecting controller is used to export electric current connects line terminals
(A10) it is connected to the ground connection connecting terminal (N411) of Current Transformer Secondary measurement winding, wherein current transformer B phase is secondary
The connecting terminal for measuring the input current of winding (1TAb) is connected to the ground connection connecting terminal of Current Transformer Secondary measurement winding
(N411)。
2. the metering secondary current circuit of main transformer according to claim 1, which is characterized in that further include electric current wiring
Terminal group.
3. the metering secondary current circuit of main transformer according to claim 2, which is characterized in that current transformer A phase
The connecting terminal (A411) of the output electric current of double measurement winding (1TAa) is connected to the first electric current in current terminal subgroup
Connecting terminal (1D7), then be wired to the A for input current of electric energy meter and connect line terminals (1.).
4. the metering secondary current circuit of main transformer according to claim 3, which is characterized in that current transformer A phase
The connecting terminal (A411) of the output electric current of double measurement winding (1TAa) is connected in current terminal subgroup by conducting wire
First current wiring terminal (1D7), wherein conducting wire is that cross-sectional area is 2.5mm2Only strand of copper wire；And/or
The A for exporting electric current of electric energy meter connects the 4th electric current wiring that line terminals (3.) are connected in current terminal subgroup
Terminal (1D15), the A for input current for reconnecting microcomputer protecting controller connect line terminals (A7).
5. the metering secondary current circuit of main transformer according to claim 2, which is characterized in that current transformer C phase
The connecting terminal (C411) of the output electric current of double measurement winding (1TAc) is connected to the third electric current in current terminal subgroup
Connecting terminal (1D9), then be wired to the C for input current of electric energy meter and connect line terminals (7.).
6. the metering secondary current circuit of main transformer according to claim 5, which is characterized in that current transformer C phase
The connecting terminal (C411) of the output electric current of double measurement winding (1TAc) is connected in current terminal subgroup by conducting wire
Third current wiring terminal (1D9), wherein conducting wire is that cross-sectional area is 2.5mm2Only strand of copper wire；And/or
The C for exporting electric current of electric energy meter connects the 6th electric current wiring that line terminals (7.) are connected in current terminal subgroup
Terminal (1D17), the C for input current for reconnecting microcomputer protecting controller connect line terminals (A11).
7. the metering secondary current circuit of main transformer according to claim 2, which is characterized in that current transformer B phase
The connecting terminal (B411) of the output electric current of double measurement winding (1TAb) is connected to the second electric current in current terminal subgroup
Connecting terminal (1D8), by the second current wiring terminal (1D8) be connected to microcomputer protecting controller for input current
B connects line terminals (A9).
8. the metering secondary current circuit of main transformer according to claim 7, which is characterized in that current transformer B phase
The connecting terminal (B411) of the output electric current of double measurement winding (1TAb) is connected in current terminal subgroup by conducting wire
Second current wiring terminal (1D8), wherein conducting wire is that cross-sectional area is 2.5mm2Only strand of copper wire；And/or
Second current wiring terminal (1D8) is connected to micro- by the 5th current wiring terminal (1D16) in current terminal subgroup
The B for input current of machine protection supervisory equipment connects line terminals (A9).
9. the metering secondary current circuit of main transformer according to claim 2, which is characterized in that digital relay and monitoring dress
The A for exporting electric current set connects the 7th current wiring terminal in line terminals (A8) connection current terminal subgroup
(1D10), the B for exporting electric current of microcomputer protecting controller connect in line terminals (A10) connection current terminal subgroup
8th current wiring terminal (1D11), the C for exporting electric current of microcomputer protecting controller connect line terminals (A12) connection electricity
Flow the 9th current wiring terminal (1D12) in terminals subgroup, wherein the 7th current wiring terminal (1D10), the 8th electric current connect
Line terminals (1D11) and the 9th current wiring terminal (1D12) are wired to the ground connection of Current Transformer Secondary measurement winding after being shorted
Connecting terminal (N411).
10. the metering secondary current circuit of main transformer according to claim 1, which is characterized in that current transformer two
The connecting terminal of secondary measurement winding output current and the connecting terminal of first winding input current are homopolar end.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820516540.9U CN208297591U (en) | 2018-04-12 | 2018-04-12 | The metering secondary current circuit of main transformer |
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| CN201820516540.9U CN208297591U (en) | 2018-04-12 | 2018-04-12 | The metering secondary current circuit of main transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108776252A (en) * | 2018-04-12 | 2018-11-09 | 山东钢铁股份有限公司 | The metering secondary current circuit of main transformer |
| CN108776252B (en) * | 2018-04-12 | 2024-05-28 | 山东钢铁股份有限公司 | Metering secondary current loop of main transformer |
-
2018
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108776252A (en) * | 2018-04-12 | 2018-11-09 | 山东钢铁股份有限公司 | The metering secondary current circuit of main transformer |
| CN108776252B (en) * | 2018-04-12 | 2024-05-28 | 山东钢铁股份有限公司 | Metering secondary current loop of main transformer |
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