CN205920143U - Metering current mutual inductor secondary load compensation arrangement and electric energy metering device - Google Patents
Metering current mutual inductor secondary load compensation arrangement and electric energy metering device Download PDFInfo
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- CN205920143U CN205920143U CN201620427980.8U CN201620427980U CN205920143U CN 205920143 U CN205920143 U CN 205920143U CN 201620427980 U CN201620427980 U CN 201620427980U CN 205920143 U CN205920143 U CN 205920143U
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Abstract
The utility model discloses a metering current mutual inductor secondary load compensation arrangement and electric energy metering device, metering current mutual inductor secondary load compensation arrangement includes resistance, inductance and a plurality of connecting wire, resistance passes through with the inductance the connecting wire series connection, resistance with the inductance forms current circuit, current circuit is used for the secondary metering winding series connection with current transformer. Metering current mutual inductor secondary load compensation arrangement and electric energy metering device through the dead load that the forms current circuit secondary metering winding series connection with current transformer, can compensate secondary load to the setting of current transformer's secondary metering winding, avoids because of the current transformer secondary load undersize leads to current transformer operation error overproof accuracy, the fairness of current transformer 0 measurement.
Description
Technical field
This utility model is related to power current transformer technical field, and more particularly, to a kind of metering current mulual inductor is secondary negative
Carry compensation device and electric power meter.
Background technology
Dl/t448-2000 " electric power meter technical management code " specifies: " the actual secondary load of transformer should be
In the range of the specified secondary load of 25%-100% ".Advise during jjg 1021-2007 " electric power mutual-inductor vertification regulation " error testing
Fixed: " current transformer of secondary rated current 5a, lower limit load is pressed 3.75va and chosen；Secondary rated current is that the electric current of 1a is mutual
Sensor, lower limit load is pressed 1va and is chosen ".Traditional, after using electronic electric energy meter and special measuring loop, many metering electricity
The secondary actual loading of current transformer is below regulation lower limit load so that the kinematic error of metering current mulual inductor occurs partially
Difference, in addition overproof it is impossible to ensure the accurately and just of electric energy metrical.
Content of the invention
Based on this, this utility model is to overcome the defect of prior art, provides one kind it can be avoided that because of current transformer
The current transformer kinematic error that secondary load is too small and leads to is overproof, ensure the accurate metering current mulual inductor of electric energy metrical two
Secondary load compensation apparatus and electric power meter.
Its technical scheme is as follows:
A kind of metering current mulual inductor secondary load compensation device, including resistance, inductance and some connecting wires, described
Resistance is connected in series by described connecting wire with inductance, and described resistance forms series circuit, described series electrical with described inductance
Road is used for being connected with the secondary measurement windings in series of current transformer.
Wherein in an embodiment, described metering current mulual inductor secondary load compensation device also includes encapsulating box,
Described series circuit is located in described encapsulation box, and the connecting wire at described series circuit two ends passes outside described encapsulation box.
Wherein in an embodiment, described encapsulation box is plastic insulation box.
Wherein in an embodiment, the resistance of described resistance is 0.8 ω, and the induction reactance value of described inductance is 1.9ml.
A kind of electric power meter, including current transformer, electric energy meter and metering current mulual inductor two described above
Secondary load compensation apparatus, described metering current mulual inductor secondary load compensation device, described current transformer secondary measurement around
Group and described electric energy meter are sequentially connected in series.
The beneficial effects of the utility model are:
Above-mentioned metering current mulual inductor secondary load compensation device, the series circuit that resistance is formed with inductance can be used as fixation
Load, the dead load that series circuit is formed is connected with the secondary measurement windings in series of current transformer, that is, pass through fixing negative
Carry the secondary measurement loop being serially connected with current transformer, the secondary load of secondary measurement winding carrying out compensation current transformer is to rule
Definite value, and then avoid because Current Transformer Secondary load is too small leading to current transformer kinematic error overproof it is ensured that electric energy meter
That measures is accurate, just.
Described electric power meter includes above-mentioned metering current mulual inductor secondary load compensation device, possesses described metering electricity
The technique effect of current transformer secondary load compensation device, can avoid because Current Transformer Secondary load is too small and lead to electric current mutual
Sensor kinematic error overproof it is ensured that electric energy metrical accurate, just.
Brief description
Fig. 1 is the structural representation of the metering current mulual inductor secondary load compensation device described in this utility model embodiment
Figure；
Fig. 2 is the structural representation of the electric power meter described in this utility model embodiment.
Description of reference numerals:
10th, metering current mulual inductor secondary load compensation device, 110, resistance, 120, inductance, 130, connecting wire, 140,
Encapsulation box, 20, current transformer, 210, secondary measurement winding, 30, electric energy meter.
Specific embodiment
Below embodiment of the present utility model is described in detail:
As shown in Figure 1 and Figure 2, a kind of electric power meter, including metering current mulual inductor secondary load compensation device 10,
Current transformer 20 and electric energy meter 30.
Described metering current mulual inductor secondary load compensation device 10 includes resistance 110, inductance 120 and some connections and leads
Line 130, described resistance 110 is connected in series by described connecting wire 130 with inductance 120, described resistance 110 and described inductance
120 formation series circuits, described series circuit is used for being connected in series with the secondary measurement winding 210 of current transformer 20.Described
The series circuit that resistance 110 is formed with inductance 120 can be as dead load, by the dead load and the electricity that form series circuit
The secondary measurement winding 210 of current transformer 20 is connected in series, and dead load will be serially connected with the secondary measurement of current transformer 20
Loop, the secondary load of secondary measurement winding 210 that can compensate for current transformer 20 is to setting, it is to avoid because of current transformer
20 secondary loads too small and lead to current transformer 20 kinematic error overproof it is ensured that electric energy metrical accurate, just.
Described metering current mulual inductor secondary load compensation device 10 also includes encapsulating box 140, described series circuit position
In described encapsulation box 140, the connecting wire 130 at described series circuit two ends passes outside described encapsulation box 140.By setting
Put encapsulation box 140, on the one hand can be used for receiving, encapsulating described resistance 110 and inductance 120, protect each element；On the other hand
The described metering current mulual inductor secondary load compensation device 10 of this enforcement can be made to be an entirety, be easy to assemble and disassemble.Described encapsulation
Box 140 is plastic insulation box, and good insulation preformance, using safety.
In the present embodiment, described resistance 110 is precision resister, and described inductance 120 is high accuracy inductance.Take power factor
For 0.8,20 2 rated current of metering current mulual inductor are 1a, when the resistance of described resistance 110 is 0.8 ω, the sense of inductance 120
Anti- the impedance of compensation is z=(0.8+0.6j) ω when being worth for 1.9ml, ensure that the secondary dead load of compensation is 1va.Tool
Body, the value of resistance 110 and inductance 120 can be chosen according to the use demand of practical situation.General, secondary specified electricity
The current transformer of stream 5a, lower limit load is pressed 3.75va and is chosen；Secondary rated current is the current transformer of 1a, and lower limit load is pressed
1va chooses.In a practical situation, rated current is the secondary actual loading of the metering current mulual inductor 20 of 1a less than specified loads
Phenomenon more universal, the present embodiment passes through the resistance 110 and inductance 120 using above-mentioned value, mainly for rated current is
The metering current mulual inductor of 1a, disclosure satisfy that the secondary load of the metering current mulual inductor 20 that rated current is 1a requires.
Described metering current mulual inductor secondary load compensation device 10, the secondary measurement winding of described current transformer 20
210 and described electric energy meter 30 be sequentially connected in series.It is secondary negative that described electric power meter includes above-mentioned metering current mulual inductor
Carry compensation device 10, possess the technique effect of described metering current mulual inductor secondary load compensation device 10, can avoid because of electric current
Transformer 20 secondary load too small and lead to current transformer 20 kinematic error overproof it is ensured that electric energy metrical accurate, just.
Each technical characteristic of embodiment described above can arbitrarily be combined, for making description succinct, not to above-mentioned reality
The all possible combination of each technical characteristic applied in example is all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all it is considered to be the scope of this specification record.
Embodiment described above only have expressed several embodiments of the present utility model, and its description is more concrete and detailed,
But therefore can not be interpreted as the restriction to utility model patent scope.It should be pointed out that the common skill for this area
For art personnel, without departing from the concept of the premise utility, some deformation can also be made and improve, these broadly fall into
Protection domain of the present utility model.Therefore, the protection domain of this utility model patent should be defined by claims.
Claims (3)
1. a kind of metering current mulual inductor secondary load compensation device is it is characterised in that include resistance, inductance and some connections
Wire, described resistance is connected in series by described connecting wire with inductance, and described resistance forms series circuit, institute with described inductance
State series circuit for being connected with the secondary measurement windings in series of current transformer, also include encapsulating box, described series circuit
In described encapsulation box, the connecting wire at described series circuit two ends passes outside described encapsulation box, described encapsulation box
For plastic insulation box, described resistance is precision resister, and described inductance is high accuracy inductance.
2. metering current mulual inductor secondary load compensation device according to claim 1 is it is characterised in that described resistance
Resistance is 0.8 ω, and the induction reactance value of described inductance is 1.9ml.
3. a kind of electric power meter is it is characterised in that include current transformer, electric energy meter and any one of claim 1-2
Described metering current mulual inductor secondary load compensation device, described metering current mulual inductor secondary load compensation device, described
The secondary measurement winding of current transformer and described electric energy meter are sequentially connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620427980.8U CN205920143U (en) | 2016-05-11 | 2016-05-11 | Metering current mutual inductor secondary load compensation arrangement and electric energy metering device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620427980.8U CN205920143U (en) | 2016-05-11 | 2016-05-11 | Metering current mutual inductor secondary load compensation arrangement and electric energy metering device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109212293A (en) * | 2018-10-18 | 2019-01-15 | 中国电力科学研究院有限公司 | A kind of power supply type voltage transformer and application method with voltage measurement function |
| CN109814060A (en) * | 2019-01-03 | 2019-05-28 | 广西电网有限责任公司贵港供电局 | The verification system and its method of more high-tension current inductors |
-
2016
- 2016-05-11 CN CN201620427980.8U patent/CN205920143U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109212293A (en) * | 2018-10-18 | 2019-01-15 | 中国电力科学研究院有限公司 | A kind of power supply type voltage transformer and application method with voltage measurement function |
| CN109212293B (en) * | 2018-10-18 | 2021-04-02 | 中国电力科学研究院有限公司 | Power supply type voltage transformer with voltage metering function and use method |
| CN109814060A (en) * | 2019-01-03 | 2019-05-28 | 广西电网有限责任公司贵港供电局 | The verification system and its method of more high-tension current inductors |
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