CN206609912U - The voltage transformer module and electric power meter of 10kV electric power meters - Google Patents
The voltage transformer module and electric power meter of 10kV electric power meters Download PDFInfo
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- CN206609912U CN206609912U CN201720079254.6U CN201720079254U CN206609912U CN 206609912 U CN206609912 U CN 206609912U CN 201720079254 U CN201720079254 U CN 201720079254U CN 206609912 U CN206609912 U CN 206609912U
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Abstract
The utility model is related to the voltage transformer module and electric power meter of a kind of 10kV electric power meters；The voltage transformer module of 10kV electric power meters includes first voltage transformer, second voltage transformer and tertiary voltage transformer；The primary winding head end of the primary winding head end of first voltage transformer, the primary winding head end of second voltage transformer and tertiary voltage transformer connects each phase electric wire of 10kV power networks respectively；The primary winding end of the primary winding end of first voltage transformer, the primary winding end of second voltage transformer and tertiary voltage transformer is connected with each other and hanging；The secondary coil head end of first voltage transformer, the secondary coil head end of second voltage transformer, and the secondary coil head end of tertiary voltage transformer connect each phase voltage end of three-phase three-wire electric energy meter respectively；The secondary coil end of the secondary coil end of first voltage transformer, the secondary coil end of second voltage transformer and tertiary voltage transformer is connected with each other and is grounded.
Description
Technical field
The utility model is related to technical field of electric power, more particularly to a kind of voltage transformer of 10kV electric power meters
Module and electric power meter.
Background technology
For power supply reliability, used 10kV power networks are typically run using neutral point insulation, such power network single-phase earthing
When, power network only has one point earth, and power network can be continued to run with the short time as customer power supply, raising power supply reliability.For this
The electric energy metrical voltage transformer module of class power network is the important component of electric power meter, and it is to electric power meter
Safe operation has vital effect.
In traditional scheme, the voltage transformer module of 10kV electric power meters generally includes two voltage transformers, two
Each end of individual voltage transformer primary winding connects 10kV power networks by fuse respectively, above-mentioned secondary coil of voltage transformer
Each end is all connected with the three-phase three-wire electric energy meter in electric power meter；Each voltage transformer of above-mentioned voltage transformer module
In, its primary side need to bear in the course of the work the line voltage from 10kV power networks, i.e. primary winding to bear voltage high, by
The volume of single device and the limitation of radiating, the turn-to-turn of coil successively of each voltage transformer, layer insulation nargin are small, and radiating is tired
Difficulty, if line voltage raises (thunderbolt, switching overvoltage, single-phase earthing such as occur) suddenly, easily causes voltage transformer
Insulating barrier is damaged, the problems such as the turn-to-turn of primary winding, layer insulation accelerated ageing, so that each in voltage transformer module
Voltage transformer loss becomes big, reduces the service life of each voltage transformer.
Utility model content
Based on this, it is necessary to in traditional scheme, rise makes each in voltage transformer module to line voltage suddenly
Voltage transformer loss becomes big, and there is provided a kind of 10kV electric energy metricals for the technical problem of each voltage transformer service life of reduction
The voltage transformer module and electric power meter of device.
A kind of voltage transformer module of 10kV electric power meters, including first voltage transformer, second voltage mutual inductance
Device and tertiary voltage transformer；
The primary winding head end of the first voltage transformer, the primary winding head end and the 3rd of second voltage transformer
The primary winding head end of voltage transformer connects each phase electric wire of 10kV power networks respectively；The primary winding end of first voltage transformer
The primary winding end at end, the primary winding end of second voltage transformer and tertiary voltage transformer is connected with each other and hanging；
The secondary coil head end of the first voltage transformer, the secondary coil head end of second voltage transformer, and tertiary voltage are mutual
The secondary coil head end of sensor connects each phase voltage end of three-phase three-wire electric energy meter respectively；The secondary coil of first voltage transformer
The secondary coil end of end, the secondary coil end of second voltage transformer and tertiary voltage transformer is connected with each other and connect
Ground.
The voltage transformer module of above-mentioned 10kV electric power meters, sets first voltage transformer, second voltage mutual inductance
The voltage transformer of three all insulations of device and tertiary voltage transformer, the primary winding head end point of above-mentioned three voltage transformers
Be not connected on each phase electric wire of 10kV power networks, the end of primary winding be connected with each other it is simultaneously hanging, three voltage transformers it is secondary
Coil end is grounded after being connected with each other, and each secondary coil head end connects each phase voltage end of three-phase three-wire electric energy meter, makes every respectively
The voltage that voltage transformer primary winding is born is the corresponding phase voltage of corresponding 10kV power networks, each voltage transformer primary line
Enclose the turn-to-turn insulation and layer insulation of each voltage transformer primary winding in the voltage burden reduction of side, voltage transformer module
Nargin is improved, while improving the excitation saturation nargin of iron core in each voltage transformer, advantageously reduces mutual induction of voltage
The loss of device module, lifts the service life of above-mentioned voltage transformer module.
A kind of electric power meter, including above-mentioned voltage transformer module, and three-phase three-wire electric energy meter.
Above-mentioned electric power meter, the voltage transformer module got a promotion including the use of the life-span, thus electric energy metrical are filled
The turn-to-turn insulation and layer insulation nargin for each voltage transformer primary winding put are improved, while improving encouraging for iron core
Magnetic saturation nargin, thus the reliability of voltage circuit is improved.
Brief description of the drawings
Fig. 1 is the voltage transformer modular structure schematic diagram of one embodiment；
Fig. 2 is the voltage transformer modular structure schematic diagram of one embodiment；
Fig. 3 is the voltage transformer modular structure schematic diagram of one embodiment；
Fig. 4 is the electric power meter schematic diagram of one embodiment.
Embodiment
The voltage transformer module and electric energy of the 10kV electric power meters provided below in conjunction with the accompanying drawings the utility model
Metering device is described in detail.
With reference to Fig. 1, Fig. 1 show the voltage transformer modular structure signal of the 10kV electric power meters of one embodiment
Figure, as shown in figure 1, above-mentioned voltage transformer module can include first voltage transformer 41, second voltage transformer 42 and
Tertiary voltage transformer 43；
The primary winding head end of the first voltage transformer 41, the primary winding head end of second voltage transformer 42 and
The primary winding head end of tertiary voltage transformer 43 connects each phase electric wire (such as first voltage transformer 41 of 10kV power networks 44 respectively
Primary winding head end connection 10kV power networks 44 A phase lines, the primary winding head end connection 10kV electricity of second voltage transformer 42
The B phase lines of net 44, the C phase lines of the primary winding head end connection 10kV power networks 44 of tertiary voltage transformer 43)；First voltage mutual inductance
The primary winding of the primary winding end of device 41, the primary winding end of second voltage transformer 42 and tertiary voltage transformer 43
End is connected with each other and hanging；The secondary coil head end of the first voltage transformer 41, second voltage transformer 42 it is secondary
Coil head end, and the secondary coil head end of tertiary voltage transformer 43 connect each phase voltage end of three-phase three-wire electric energy meter respectively
(the secondary coil head end of such as first voltage transformer 41 connects the A phase voltages end of three-phase three-wire electric energy meter 21, the second voltage
The secondary coil head end of transformer 42 connects the B phase voltages end of three-phase three-wire electric energy meter 21, the tertiary voltage transformer 43
Secondary coil head end connects the C phase voltages end of three-phase three-wire electric energy meter 21)；The secondary coil end of first voltage transformer 41,
The secondary coil end of second voltage transformer 42 and the secondary coil end of tertiary voltage transformer 43 are connected with each other and are grounded.
The head end of each coil of above-mentioned each voltage transformer is the Same Name of Ends of the coil, each each coil of voltage transformer
End is the non-same polarity of the coil, such as, and the head end of the primary winding of first voltage transformer 41 is the of the same name of primary winding
End, its end is the non-same polarity of the primary winding.
The voltage transformer module for the 10kV electric power meters that the present embodiment is provided, setting first voltage transformer 41,
The voltage transformer of 43 3 all insulations of second voltage transformer 42 and tertiary voltage transformer, above-mentioned three voltage transformers
Primary winding head end be connected on respectively on each phase electric wire of 10kV power networks, the end of primary winding be connected with each other it is simultaneously hanging, three
The secondary coil end of voltage transformer is grounded after being connected with each other, and each secondary coil head end connects each of three-phase three-wire electric energy meter respectively
Phase voltage end, the voltage for being born every voltage transformer primary winding is the corresponding phase voltage of corresponding 10kV power networks, each
The circle of each voltage transformer primary winding in the voltage burden reduction of voltage transformer primary winding side, voltage transformer module
Between insulation and layer insulation nargin be improved, while improving the excitation saturation nargin of iron core in each voltage transformer, have
Beneficial to the loss of reduction voltage transformer module, the service life of above-mentioned voltage transformer module is lifted.
With reference to shown in Fig. 2, the A phases of the head end connection 10kV power networks 44 of the primary winding 11 of the first voltage transformer 41
Line, the B phase lines of the head end connection 10kV power networks 44 of the primary winding 12 of second voltage transformer 42, tertiary voltage transformer 43
The C phase lines of the head end connection 10kV power networks 44 of primary winding 13；
The head end of secondary coil 14 of the first voltage transformer 41 connects the A phase voltages end of three-phase three-wire electric energy meter 21
UA, the B phase voltages end UB of the head end of the secondary coil 15 connection three-phase three-wire electric energy meter 21 of the second voltage transformer 42, it is described
The head end of secondary coil 16 of tertiary voltage transformer 43 connects the C phase voltages end UC of three-phase three-wire electric energy meter 21.
In the voltage transformer module for the 10kV electric power meters that the present embodiment is provided, each voltage transformer, such as the
One voltage transformer (including primary winding 11 and secondary coil 14), second voltage transformer (including primary winding 12 and secondary
Coil 15) and tertiary voltage transformer (including primary winding 13 and secondary coil 16), more can accurately it carry out corresponding
Connection.
With reference to shown in Fig. 3, in one embodiment, the voltage transformer module of above-mentioned 10kV electric power meters may be used also
With including first fuse 23, the fuse 25 of second fuse 24 and the 3rd；
The first fuse 23 is connected to the head end of primary winding 11 of the first voltage transformer and the A of 10kV power networks
Between phase line；The second fuse 24 is connected to the head end of primary winding 12 and 10kV power networks of the second voltage transformer
Between B phase lines；3rd fuse 25 is connected to the head end of primary winding 14 and 10kV power networks of the tertiary voltage transformer
C phase lines between.
Above-mentioned first fuse 23, the fuse 25 of second fuse 24 and the 3rd are high-tension fuse.
The present embodiment is accessed between the primary winding head end and corresponding 10kV power networks of each voltage transformer respectively
One fuse, it is ensured that the safe operation of each voltage transformer, so as to improve the safety of relevant voltage transformer module
Performance.
As shown in figure 3, in one embodiment, the voltage transformer module of above-mentioned 10kV electric power meters can be with
Including nonlinear resistance 27；
One end of the nonlinear resistance 27 connects the end of primary winding 11 of first voltage transformer, second voltage respectively
The end of primary winding 12 of transformer and the end of primary winding 13 of tertiary voltage transformer, i.e. first voltage transformer are once
The end of primary winding 13 of the end of coil 11, the end of primary winding 12 of second voltage transformer and tertiary voltage transformer is mutual
After connection, it is grounded by above-mentioned nonlinear resistance 27, the other end ground connection of above-mentioned nonlinear resistance 27.
The present embodiment is at the end of primary winding 11 of first voltage transformer, the end of primary winding 12 of second voltage transformer
After end and the end of primary winding 13 of tertiary voltage transformer are connected with each other, nonlinear resistance 27 is set, makes above-mentioned non-linear electricity
Resistance 27 is connected between the primary winding end of each voltage transformer and ground terminal, and the both end voltage of nonlinear resistance 27 is less than
During critical voltage, in open-circuit condition so that the primary winding end of each voltage transformer is approximately hanging, when voltage is higher than critical
After voltage, in voltage stabilizing state., can effective each voltage transformer of clamper when 10kV power network single-phase earthings voltage instantaneous is raised
Primary winding end voltage-to-ground, it is ensured that the trouble free service of voltage transformer primary winding.Above-mentioned critical voltage setting range can
Think corresponding primary winding rated voltage 1.2 to 1.5 times.
If the voltage rise (producing mutation, moment rise) of 10kV power networks, the nonlinear resistance carries out voltage clamping, will
The corresponding voltage control of primary winding of the first voltage transformer, second voltage transformer and tertiary voltage transformer is being set
Determine in scope.Above-mentioned setting range can be 1.2 to 1.5 times of corresponding primary winding rated voltage this voltage ranges.
In the corresponding electric power meter course of work of above-mentioned voltage transformer module, if 10kV power networks are undergone mutation
(such as single-phase earthing situation), necessarily causes the voltage-to-ground liter of the primary winding end of three voltage transformers of interconnection
The moment disconnected after height, the single-phase earthing of 10kV power networks, its voltage is possible to be increased to 2 to 3 times of line voltage, causes voltage mutual
Sensor insulation damages.Above-mentioned nonlinear resistance is accessed voltage transformer module by the present embodiment, when the one of each voltage transformer
When secondary coil terminal voltage is raised, nonlinear resistance can be by the voltage-to-ground clamper of primary winding end in certain scope
It is interior, in such as 1.2 to the 1.5 times primary winding ranges of nominal tension so that the primary winding end of three all insulation voltage transformers
Voltage-to-ground is protected by clamper, further improves the security performance of relevant voltage transformer module.
A kind of electric power meter, including above-mentioned voltage transformer module, and three-phase three-wire electric energy meter.
The electric power meter that the present embodiment is provided may be referred to shown in Fig. 1, the voltage got a promotion including the use of the life-span
Transformer module, the turn-to-turn insulation and layer insulation nargin of each voltage transformer primary winding of electric power meter are carried
Height, while the excitation saturation nargin of iron core is improved, thus the reliability of voltage circuit is improved.
With reference to shown in Fig. 4, in one embodiment, above-mentioned electric power meter can also include the first current transformer
31 and second current transformer 32；
The primary winding of first current transformer 31 is connected in the A phase lines of 10kV power networks, the first current transformer
The head end of 31 secondary coils connects the A phase current input IA+ of three-phase three-wire electric energy meter, the secondary coil of the first current transformer 31
End connect three-phase three-wire electric energy meter A phase current output ends IA-；
The primary winding of second current transformer 32 is connected in the C phase lines of 10kV power networks, the second current transformer
The head end of 32 secondary coils connects the C phase current input IC+ of three-phase three-wire electric energy meter, the secondary coil of the second current transformer 32
End connect three-phase three-wire electric energy meter C phase current output ends IC-.
The head of each coil of above-mentioned each current transformer (including the first current transformer 31 and second current transformer 32)
The Same Name of Ends for the coil is held, the end of each each coil of current transformer is the non-same polarity of the coil, such as, the first electric current
The secondary coil head end of transformer 31 is the Same Name of Ends of the secondary coil, and its end is the non-same polarity of secondary coil.
The electric current of 10kV power networks is introduced by the first current transformer 31 and the second current transformer 32 in the present embodiment
The three-phase three-wire electric energy meter of electric power meter, it is ensured that the security of above-mentioned three-phase three-wire electric energy meter work, so as to improve
The security of corresponding electric power meter work.
As shown in figure 4, as one embodiment, the end of the above-mentioned secondary coil of first current transformer 31 and the second electricity
The end of the secondary coil of current transformer 32 can be grounded respectively, further the security performance of lifting electric power meter.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses several embodiments of the present utility model, and it describes more specific and detailed,
But therefore it can not be interpreted as the limitation to utility model patent scope.It should be pointed out that for the common skill of this area
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
Protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (7)
1. a kind of voltage transformer module of 10kV electric power meters, it is characterised in that including first voltage transformer, second
Voltage transformer and tertiary voltage transformer；
The primary winding head end of the first voltage transformer, the primary winding head end of second voltage transformer and tertiary voltage
The primary winding head end of transformer connects each phase electric wire of 10kV power networks respectively；The primary winding end of first voltage transformer,
The primary winding end of second voltage transformer and the primary winding end of tertiary voltage transformer are connected with each other and hanging；It is described
The secondary coil head end of first voltage transformer, the secondary coil head end of second voltage transformer, and tertiary voltage transformer
Secondary coil head end connect each phase voltage end of three-phase three-wire electric energy meter respectively；The secondary coil end of first voltage transformer
The secondary coil end at end, the secondary coil end of second voltage transformer and tertiary voltage transformer is connected with each other and is grounded.
2. the voltage transformer module of 10kV electric power meters according to claim 1, it is characterised in that described first
The primary winding head end of voltage transformer connects the A phase lines of 10kV power networks, the primary winding head end connection of second voltage transformer
The B phase lines of 10kV power networks, the primary winding head end of tertiary voltage transformer connects the C phase lines of 10kV power networks；
The secondary coil head end of the first voltage transformer connects the A phase voltages end of three-phase three-wire electric energy meter, second electricity
Press transformer secondary coil head end connect three-phase three-wire electric energy meter B phase voltages end, the tertiary voltage transformer it is secondary
Coil head end connects the C phase voltages end of three-phase three-wire electric energy meter.
3. the voltage transformer module of 10kV electric power meters according to claim 2, it is characterised in that also including
One fuse, second fuse and the 3rd fuse；
The first fuse be connected to the primary winding head end of the first voltage transformer and 10kV power networks A phase lines it
Between；The second fuse is connected between the primary winding head end of the second voltage transformer and the B phase lines of 10kV power networks；
3rd fuse is connected between the primary winding head end of the tertiary voltage transformer and the C phase lines of 10kV power networks.
4. the voltage transformer module of the 10kV electric power meters according to any one of claims 1 to 3, its feature exists
In, in addition to nonlinear resistance；
One end of the nonlinear resistance connects the primary winding end of first voltage transformer, second voltage transformer respectively
Primary winding end and the primary winding end of tertiary voltage transformer, the other end ground connection of nonlinear resistance.
5. a kind of electric power meter, it is characterised in that including the voltage transformer module described in any one of Claims 1-4,
And three-phase three-wire electric energy meter.
6. electric power meter according to claim 5, it is characterised in that also including the first current transformer and the second electricity
Current transformer；
The primary winding of first current transformer is connected in the A phase lines of 10kV power networks, the first Current Transformer Secondary line
The head end of circle connects the A phase current inputs of three-phase three-wire electric energy meter, the end connection three of the first Current Transformer Secondary coil
The A phase current output ends of phase three-wire electric energy meter；
The primary winding of second current transformer is connected in the C phase lines of 10kV power networks, the second Current Transformer Secondary line
The head end of circle connects the C phase current inputs of three-phase three-wire electric energy meter, the end connection three of the second Current Transformer Secondary coil
The C phase current output ends of phase three-wire electric energy meter.
7. electric power meter according to claim 6, it is characterised in that the first Current Transformer Secondary coil
End and the end of the second Current Transformer Secondary coil are grounded respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720079254.6U CN206609912U (en) | 2017-01-19 | 2017-01-19 | The voltage transformer module and electric power meter of 10kV electric power meters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720079254.6U CN206609912U (en) | 2017-01-19 | 2017-01-19 | The voltage transformer module and electric power meter of 10kV electric power meters |
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| CN206609912U true CN206609912U (en) | 2017-11-03 |
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| CN201720079254.6U Active CN206609912U (en) | 2017-01-19 | 2017-01-19 | The voltage transformer module and electric power meter of 10kV electric power meters |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106680565A (en) * | 2017-01-19 | 2017-05-17 | 广东电网有限责任公司中山供电局 | Voltage transformer module for 10kV electric energy metering device, and electric energy metering device |
-
2017
- 2017-01-19 CN CN201720079254.6U patent/CN206609912U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106680565A (en) * | 2017-01-19 | 2017-05-17 | 广东电网有限责任公司中山供电局 | Voltage transformer module for 10kV electric energy metering device, and electric energy metering device |
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