CN208383958U - Unified multiplying power wide cut metering current mulual inductor - Google Patents
Unified multiplying power wide cut metering current mulual inductor Download PDFInfo
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- CN208383958U CN208383958U CN201820899283.1U CN201820899283U CN208383958U CN 208383958 U CN208383958 U CN 208383958U CN 201820899283 U CN201820899283 U CN 201820899283U CN 208383958 U CN208383958 U CN 208383958U
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Abstract
The utility model discloses a kind of unified multiplying power wide cut metering current mulual inductors.The utility model includes wide cut current sampling device and intelligent conversion terminal, and the sample range of rated primary current 1%~120% of the sampling precision of wide cut current sampling device in addition to can satisfy acquisition ordinary electric current mutual-inductor can also meet the sample range of rated primary current 0.2%~1%.And two kinds of being realized by intelligent conversion terminal for sample range are automatically switched.The utility model substantially increases the accuracy of field of power system electric-power metering.
Description
Technical field
The utility model relates to electric energy measuring equipment field in electrical equipment, specially a kind of unified multiplying power wide cut meter
Measure current transformer and preparation method thereof, control method.
Background technique
In order to guarantee power system security economical operation, it is necessary to carry out monitoring and measuring to the operating condition of power equipment.
But general measurement and protection device cannot directly access a high-tension apparatus, and need the high current of primary system in proportion
It is transformed into low current, measuring instrumentss is supplied and protective device uses.It, can be reality such as the current transformer that no-load voltage ratio is 400/5
It is changed into the electric current of 5A for the electric current of 400A.In addition to playing the role of current transformation, electrical isolation is also acted as.Current Mutual Inductance
Device is made of the iron core and winding being closed.Its first winding the number of turns is seldom, often there was only a circle, that is, punching in practice
And mistake, it goes here and there in the route for the electric current for needing to measure, therefore it often has whole electric currents of route to flow through, secondary side the number of turns compares
It is more, it is serially connected in the equipment such as measuring instrumentss and protective loop.
When measuring electric current due to the difference of electrical equipment capacity, the current value for needing to measure varies, if fixed
With one group of biggish current transformer of no-load voltage ratio when surveying high current, the current value precision tested out is higher, but as low capacity
The current value precision that the bigger mutual inductor measuring of electrical equipment time-varying tries out will be lower, causes error very big.Such as 100/5
Current transformer, according to national standard, ratio difference when primary current is the 1% of rated primary current is ± 0.75%, i.e., electric
The secondary current of current transformer needs 0.05A, but in 1% range below due to the non-linear relation of electromagnetic transfer, 1% with
Under current measurement errors it is larger, i.e., primary current is not achieved in 1A or less measurement accuracy.And it uses and 100/5 same multiplying power
A kind of 20/1 current transformer accounts for the 5% of rated primary current, the 1% of rated primary current is when primary current is 1A
0.2A, cannot be excessively negative for a long time when electric current is more than 20A although meeting primary current in 1A precise measurement below
Lotus operation.And in integrated mill, the electricity consumption that works by day is big, and up to several hundred peaces, and to night, closing machine only remains electric current
In the case where illumination therefore electric current seldom needs to design one kind again can automatically switch current transformer according to the size of load
Precision realizes that a kind of current transformer that electric current measures range is widened becomes a kind of urgent requirement.
Summary of the invention
Technical problem to be solved by the utility model is: provide one kind meets country's mark within the scope of wider current sample
A kind of unified multiplying power wide cut metering current mulual inductor of quasi- required precision.
The technical solution of the technical problems to be solved in the utility model is:
Unified multiplying power wide cut metering current mulual inductor, it is characterised in that: including wide cut current sampling device and intelligent conversion
Terminal, the wide cut current sampling device and intelligent conversion terminal are electrically connected.The wide cut current sampling device output is large and small
The current signal of sample range gives intelligent conversion terminal.The primary current of the big sample range is the 1% of rated primary current
~120%, the primary current of the small sample range is the 0.2%~1% of rated primary current.The intelligent conversion terminal is certainly
It is dynamic to judge and switch the electric current of large and small sample range to metering device.
Preferably, the secondary winding that the wide cut current sampling device is equipped with iron core and is wound around on iron core, described two
The rated secondary current of secondary winding is 5A.The secondary winding includes first coil and the second coil, the volume of the first coil
Determining secondary current is 1A, and first coil is around identical with the no-load voltage ratio multiplying power of secondary winding.
Preferably, the wide cut current sampling device further includes conversion terminal, and the conversion terminal includes public output
Son, the first current terminal, the second current terminal.One end of the conducting wire of the first coil and the electrical connection of public output,
The first coil other end and the electrical connection of the first current terminal, to export the secondary current of small sample range.Second line
One end of the conducting wire of circle and the electrical connection of public output, the second coil other end and the electrical connection of the second current terminal, are used
To combine the secondary current for exporting big sample range with the first current terminal.
Preferably, the intelligent conversion terminal includes controller, detection module, change-over switch, current terminal, the electric current
Terminal includes public input terminal, the first current input terminal, the second current input terminal, the first current output terminal, second
Current output terminal.First current output terminal and the electrical connection of public input terminal, first current output terminal
String is equipped with detection module between public input terminal, and the detection module and controller electrical connection are to detect connection first
Electric current on the conducting wire of current output terminal and public input terminal.The change-over switch be connected on the second current output terminal and
Between second current input terminal, the control signal and controller of the change-over switch are electrically connected, and first electric current is defeated
Enter terminal and the electrical connection of the second current output terminal.Public output and the electrical connection of public input terminal, it is described
First current terminal and the electrical connection of the first current input terminal, second current terminal and the second current input terminal are electrical
Connection.
Preferably, the detection module is instrument Current Transformer, and the detection module is set in the first electric current of connection
On the conducting wire of output terminal and public input terminal, the output end and controller of the detection module are electrically connected.The conversion
Switch is relay, the normally-closed contact of the change-over switch be connected on the second current input terminal and the second current output terminal it
Between, the coil windings of the controller and change-over switch are electrically connected.
Preferably, the first coil is formed by two or two or more conducting wire coilings, second coil by two or
Two or more conducting wire coilings form.
Preferably, the intelligent conversion terminal is equipped with detection of the data-interface to realize current data.
A kind of production method of unified multiplying power wide cut metering current mulual inductor, it is characterised in that the following steps are included:
Step 1, the sectional area that secondary winding iron core is determined according to specified primary, secondary current and number of ampere turns, including volume
Determine the sectional area for the coil windings that secondary current is 5AWith the sectional area for the coil windings that rated secondary current is 1AIts
The sectional area of middle first coil=The sectional area of second coil=
Step 2 designs and produces iron core, iron core by rated secondary current be 1A on the basis of be designed, core area at this time
Flux density is selected in 0.35T~0.41T when calculating, meanwhile, meet flux density when the core area that rated secondary current is 5A calculates and selects
It selects in 0.5T~0.6T,
Step 3, using current transformer calibrator and according to the data iteration adjustment second compensation circle of step 1, step 2
Number, until the required precision for the grade of errors that is up to state standards,
Step 4 wraps up coil, drying, moulding by casting using insulating materials.
Preferably, the first coil in the step 1 or the second coil use two or two or more conducting wires, and
The sectional area size of each wire of first coil or the second coil is adjusted in the step 3 according to error check result.
It is characterized by comprising following for a kind of control method of the intelligent terminal of unified multiplying power wide cut metering current mulual inductor
Step:
Under original state, change-over switch is in closed state,
Step 1, intelligent terminal electrifying startup, change-over switch are in closed state,
The size of secondary current is detected after step 2, controller operation setting time t1 by detection module,
If secondary current is less than lower limit value, controller controls change-over switch and disconnects,
If secondary current is greater than lower limit value, controller control change-over switch is kept closed,
Step 3, controller start auto-conversion function, including following two situation:
One, switching control when operating normally
After secondary current value is less than lower limit value and continues setting time t2, controller controls change-over switch and disconnects,
After secondary current value is greater than upper limit value and continues setting time t3, controller controls change-over switch closure,
Two, switching control when misoperation
After secondary current is greater than upper limit value, the amplification of electric current electric current during the sampling period is detected in setting time t3,
If the amplification of electric current is greater than amplification upper limit value, controller controls change-over switch closure,
If the amplification of electric current is less than amplification upper limit value, controller keeps the state of change-over switch.
The utility model has the following beneficial effects:
1, the secondary current for meeting national standard can be exported in broader sample range, having is to measure more accurately
Beneficial effect；
2, have the function of automatically switching two kinds of sample ranges；
3, current transformer structure is simple, low in cost using an iron core.
Detailed description of the invention
Fig. 1 is a kind of electrical structure diagram of embodiment of the utility model,
Fig. 2 is a kind of schematic diagram of embodiment secondary winding of the utility model.
In figure:
1, wide cut current sampling device, 2, intelligent conversion terminal, L2, secondary winding, L21, first coil, L22, the second line
Circle, CS1, public output, CS2, the first current terminal, CS3, the second current terminal, KS1, public input terminal, KS2,
First current input terminal, KS3, the second current input terminal, S1, the first current output terminal, S2, the second current output terminal
Son, U, controller, CT, detection module, SW, change-over switch.
Specific embodiment
To keep the technical solution of the utility model and beneficial effect clearer, below to the embodiments of the present invention
Further explained in detail.
As shown in Figure 1, the utility model is a kind of unified multiplying power wide cut metering current mulual inductor, including wide cut current sample
Device 1 and intelligent conversion terminal 2.Wide cut current sampling device 1 is primary to obtain to carry out energy exchange with primary equipment
The size of electric current on equipment conducting wire, and wide cut metering device meets different precision within the scope of different current samples and wants
It asks.Therefore, in the present invention, wide cut current sampling device 1 can have large and small sample range with the current range of precise acquisition
The sample range of two primary currents.Wherein, the primary current of big sample range is the 1%~120% of rated primary current, small
The primary current of sample range is the 0.2%~1% of rated primary current.When rated secondary current is 5A, marked according to country
The quasi- higher sample range of precision is 1%~120%, and the utility model expands to the sample range that precision meets national standard
0.2%~120%.Intelligent conversion terminal 2 and wide cut current sampling device 1 are electrically connected, to realize in different accuracy requirement
The switching of lower current sample range.Intelligent conversion terminal 2 will judge automatically and switch the collected electric current of large and small sample range institute
To metering device, i.e., the output valve of the high current sample range of sampling precision is output to metering device.When primary current is in volume
When determining between the 1%~120% of primary current, big sample range operation is automatically switched to, when primary current is specified primary electricity
When between the 0.2%~1% of stream, small sample range operation is automatically switched to.
Identical with traditional current transformer, wide cut metering sampling apparatus 1 is mainly made of iron core T and secondary winding L2,
It is typically provided lead terminal, insulating materials either first winding.The rated secondary current of secondary winding L2 is 5A, in order to make
Large and small sample range can the higher secondary current of output accuracy, Multiple coil processing has been carried out to secondary winding L2, that is, be arranged two
A winding, respectively first coil L21, the second coil L22.The rated secondary current that wherein first coil L21 is set as 1A, by
Belong to subordinate relation in first coil and secondary winding, therefore the no-load voltage ratio multiplying power of the secondary winding L2 of first coil is identical.First
Coil L21 and the second coil L22 are wound around on iron core T.Preferably, first coil L21 is by two or two or more conducting wire coilings
It forms, the second coil L22 is formed by two or two or more conducting wire coilings.It realizes and divides by using the method for multiple conducting wire coilings
Circle compensation.
First winding can be set in current transformer, and most cases do not have first winding, i.e. straight-through current transformer, because
Although this present embodiment is illustrated with no first winding, there is same effect to the current transformer with first winding
Fruit.
Preferably, for the ease of wiring, wide cut current sampling device 1 is also provided with conversion terminal.Conversion terminal includes public affairs
Output terminal CS1, the first current terminal CS2, the second current terminal CS3 altogether.Wherein, one end of the conducting wire of first coil L21 and
The sub- CS1 electrical connection of public output, the first coil L21 other end and the first current terminal CS2 electrical connection, the second coil
One end of the conducting wire of L22 and the sub- CS1 electrical connection of public output, the second coil L22 other end and the second current terminal CS3
Electrical connection.To export the secondary current of small sample range between first current terminal CS2 and the sub- CS1 of public output.The
One current terminal CS2 and the second current terminal CS3 simultaneously connects afterwards between the sub- CS1 of public output to export big sample range
Secondary current.
Acquisition of the wide cut current sampling device 1 to realize electric current, needs to be up to the current sample orientation of accuracy standard
Being switched to output end also needs intelligent conversion terminal 2 to realize.Intelligent conversion terminal 2 includes controller U, detection module CT, turns
Change switch SW, current terminal.Current terminal includes that public input terminal KS1, the first current input terminal KS2, the second electric current are defeated
Enter terminal KS3, the first current output terminal S1, the second current output terminal S2.
Wherein, the first current output terminal S1 and public input terminal KS1 electrical connection.First current output terminal S1 and
String is equipped with detection module CT, detection module CT and controller U electrical connection to detect connection the between public input terminal KS1
Electric current on the conducting wire of one current output terminal S1 and public input terminal KS1.Change-over switch SW is connected on the output of the second electric current
Between terminal S2 and the second current input terminal KS3, and the control signal of change-over switch SW and controller U electrical connection,
To realize the switching of first coil L21 and secondary winding L2 output, i.e., the switching of large and small sample range.The input of first electric current
Terminal KS2 and the second current output terminal S2 electrical connection.Operate in rated primary current 0.2%~1% between when, volume
The measurement accuracy for determining the first coil that secondary current is 1A is higher, and change-over switch SW controls the second current input terminal and the at this time
Two current output terminals it is separated, only first coil exports electric current, realizes that rated secondary current is the operating status of 1A
Output, operates at this time in small sample range；When operating between rated primary current 1%~120%, change-over switch is controlled
SW is connected to the second current input terminal KS3 and the second current output terminal S2, and entire secondary winding exports electric current, realizes specified
Secondary current is the electric current output of the operating status of 5A, is operated in big sample range at this time.In first coil isolated operation
Under state, the second coil is in the state disconnected, due to being equipped with the current transformer of multiple windings in current transformer only
In the state of having a winding closure, the possibility that the winding of disconnection will not explode, because what the high potential generated was closed
Winding is shorted neutralizing.
Intelligent conversion terminal is attached with wide cut current sampling device by respective terminal, the sub- CS1 of public output
It is electrically connected with public input terminal KS1, the first current terminal CS2 and the first current input terminal KS2 electrical connection, the second electricity
Flow terminal CS3 and the second current input terminal KS3 electrical connection.
Preferably, detection module CT is instrument Current Transformer, and detection module CT is set in connection the first electric current output
On the conducting wire of terminal S1 and public input terminal KS1.After obtaining the size of current on conducting wire by detection module CT and will convert
Electric current be output on controller U, therefore the output end of detection module CT and controller U electrical connection.
Preferably, change-over switch SW is relay, and the normally-closed contact of change-over switch SW is connected on the second current input terminal
Between KS3 and the second current output terminal S2.The electrical connection of the coil windings of controller U and change-over switch SW.Controller U is logical
It crosses the normally-closed contact of the coil windings control change-over switch SW of control change-over switch SW and then whether controls the second coil with first
Coil combination exports electric current at secondary winding.
Preferably, in order to realize maintenance and detection to intelligent conversion terminal 2, intelligent conversion terminal 2 is equipped with data-interface.
By data-interface, and then checking for current data can be realized with the acquisition of the control software realization data of PC machine.
Preferably, for the ease of the maintenance of equipment, it is also provided with indicator light in intelligent conversion terminal 2, to indicate width
Width current sampling device 1 operates in big sample range or small sample range.
A kind of production method of unified multiplying power wide cut metering current mulual inductor of the utility model the following steps are included:
Step 1, the sectional area that secondary winding L2 is determined according to specified primary, secondary current and number of ampere turns, including it is specified
Secondary current is the line footpath of the coil windings of 5AWith the line footpath for the coil windings that rated secondary current is 1AWherein first
The sectional area of coil=The sectional area of second coil=
Preferably, as shown in Fig. 2, first coil L21 or the second coil L22 uses two or two or more conducting wires.
And the sum of the area of all conducting wires of first coil L21 isThe sum of all wire cross-section areas of second coil L22 are
Step 2 designs and produces iron core, iron core by rated secondary current be 1A on the basis of be designed, core area at this time
Flux density is selected in 0.35T~0.41T when calculating, meanwhile, meet flux density when the core area that rated secondary current is 5A calculates and selects
It selects in 0.5T~0.6T.
Step 3, using current transformer calibrator and according to the data iteration adjustment second compensation circle of step 1, step 2
Number, until the required precision for the grade of errors that is up to state standards.
Preferably, when first coil L21 or the second coil L22 uses two or two or more conducting wires, according to accidentally
The sectional area size of each wire of poor check results adjustment first coil L21 or the second coil L22.
Step 4 wraps up coil, drying, moulding by casting using insulating materials.
A kind of control method of the intelligent terminal of unified multiplying power wide cut metering current mulual inductor of the utility model includes following
Step:
Under original state, change-over switch SW is in closed state,
Step 1, intelligent terminal electrifying startup, change-over switch SW are in closed state,
The size of secondary current is detected after step 2, controller U operation setting time t1 by detection module CT,
If secondary current is less than lower limit value, controller U controls change-over switch SW and disconnects,
If secondary current is greater than lower limit value, controller U control change-over switch SW is kept closed,
Step 3, controller U start auto-conversion function, including following two situation:
One, switching control when operating normally
After secondary current value is less than lower limit value and continues setting time t2, controller U controls change-over switch SW and disconnects,
After secondary current value is greater than upper limit value and continues setting time t3, controller U controls change-over switch SW closure,
Two, switching control when misoperation
After secondary current is greater than upper limit value, the amplification of electric current electric current during the sampling period is detected in setting time t3,
If the amplification of electric current is greater than amplification upper limit value, controller U controls change-over switch SW closure,
If the amplification of electric current is less than amplification upper limit value, controller U keeps the state of change-over switch SW.
In conclusion the preferred embodiment of only the utility model, is not used to limit the scope of the utility model,
Through the above description, relevant staff completely can in the range of without departing from this item utility model technical idea,
Carry out various changes and amendments.The technical scope of the utility model is not limited to the contents of the specification, Fan Yiben
Shape described in the claimed range of utility model, construction, feature and the so-called equivalent changes and modifications of spirit should all include and this
In the scope of the claims of utility model.
Claims (7)
1. unified multiplying power wide cut metering current mulual inductor, it is characterised in that:
Including wide cut current sampling device (1) and intelligent conversion terminal (2), the wide cut current sampling device (1) and intelligence turn
Terminal (2) electrical connection is changed,
The current signal that the wide cut current sampling device (1) exports large and small sample range gives intelligent conversion terminal (2),
The primary current of the big sample range is the 1%~120% of rated primary current, the primary electricity of the small sample range
Stream is the 0.2%~1% of rated primary current,
The intelligent conversion terminal (2) judges automatically and switches the current signal of large and small sample range to metering device.
2. unified multiplying power wide cut metering current mulual inductor according to claim 1, it is characterised in that:
The secondary winding (L2) that the wide cut current sampling device (1) is equipped with iron core (T) and is wound around on iron core (T), it is described
The rated secondary current of secondary winding (L2) is 5A,
The secondary winding (L2) includes first coil (L21) and the second coil (L22), the first coil (L21) it is specified
Secondary current is 1A, and first coil is identical with the no-load voltage ratio multiplying power of secondary winding (L2) around (L21).
3. unified multiplying power wide cut metering current mulual inductor according to claim 2, it is characterised in that:
The wide cut current sampling device (1) further includes conversion terminal, the conversion terminal include public output (CS1),
First current terminal (CS2), the second current terminal (CS3),
One end of the conducting wire of the first coil (L21) and public output (CS1) electrical connection, first coil (L21) are another
One end and the first current terminal (CS2) electrical connection, to export the secondary current of small sample range,
One end of the conducting wire of second coil (L22) and public output (CS1) electrical connection, the second coil (L22) are another
One end and the second current terminal (CS3) electrical connection, to combine the two of the big sample range of output with the first current terminal (CS2)
Primary current.
4. unified multiplying power wide cut metering current mulual inductor according to claim 3, it is characterised in that:
The intelligent conversion terminal (2) includes controller (U), detection module (CT), change-over switch (SW), current terminal, described
Current terminal includes public input terminal (KS1), the first current input terminal (KS2), the second current input terminal (KS3),
One current output terminal (S1), the second current output terminal (S2),
First current output terminal (S1) and public input terminal (KS1) electrical connection, first current output terminal
(S1) string is equipped with detection module (CT) between public input terminal (KS1), and the detection module (CT) and controller (U) are electrical
It connects to detect the electric current on the conducting wire for connecting the first current output terminal (S1) and public input terminal (KS1),
The change-over switch (SW) is connected between the second current output terminal (S2) and the second current input terminal (KS3), institute
State the control signal and controller (U) electrical connection of change-over switch (SW), first current input terminal (KS2) and the
Two current output terminals (S2) electrical connection,
The public output (CS1) and public input terminal (KS1) are electrically connected, first current terminal (CS2) and
First current input terminal (KS2) electrical connection, second current terminal (CS3) and the second current input terminal (KS3) electricity
Gas connection.
5. unified multiplying power wide cut metering current mulual inductor according to claim 4, it is characterised in that:
The detection module (CT) is instrument Current Transformer, and the detection module (CT) is set in connection the first electric current output
On the conducting wire of terminal (S1) and public input terminal (KS1), the output end and controller (U) of the detection module (CT) electrically connect
It connects,
The change-over switch (SW) is relay, and the normally-closed contact of the change-over switch (SW) is connected on the second current input terminal
(KS3) between the second current output terminal (S2), the coil windings of the controller (U) and change-over switch (SW) electrically connect
It connects.
6. unified multiplying power wide cut metering current mulual inductor according to claim 2, it is characterised in that:
The first coil (L21) is formed by two or two or more conducting wire coilings, and second coil (L22) is by two or two
The above conducting wire coiling of root forms.
7. unified multiplying power wide cut metering current mulual inductor according to claim 1, it is characterised in that:
The intelligent conversion terminal (2) is equipped with detection of the data-interface to realize current data.
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| CN201820899283.1U CN208383958U (en) | 2018-06-11 | 2018-06-11 | Unified multiplying power wide cut metering current mulual inductor |
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| CN108414814A (en) * | 2018-06-11 | 2018-08-17 | 山东亿玛信诺电气有限公司 | Unified multiplying power wide cut metering current mulual inductor and preparation method thereof, control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108414814A (en) * | 2018-06-11 | 2018-08-17 | 山东亿玛信诺电气有限公司 | Unified multiplying power wide cut metering current mulual inductor and preparation method thereof, control method |
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