CN2653519Y - Multiple change ratio three-phase powder meter box - Google Patents
Multiple change ratio three-phase powder meter box Download PDFInfo
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- CN2653519Y CN2653519Y CN 03270376 CN03270376U CN2653519Y CN 2653519 Y CN2653519 Y CN 2653519Y CN 03270376 CN03270376 CN 03270376 CN 03270376 U CN03270376 U CN 03270376U CN 2653519 Y CN2653519 Y CN 2653519Y
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Abstract
The utility model relates to a variable ration three phase electric energy meter box which comprises a box body, two voltage mutual inductors and two current mutual inductors. An insulating medium is arranged between the box body and the voltage mutual inductors and the current mutual inductors, one sub terminal of the two voltage mutual inductors are connected between the A phase and the B phase, the B phase and C phase. One sub terminal of the two current mutual inductors are connected with the A phase and the C phase. The second sub terminals of the two current inductors are provided with a plurality of sub connectors. The second sub terminals of the tow voltage mutual inductors and the two current inductors are connected with a second patch board respectively. The second patch board is connected with the electricity meter. The first sub terminals of the two current inductors are provided with a plurality of sub connectors. The first and the second side of the two current mutual inductors are provided with a plurality of sub connectors to realize variable ration and to ensure the precision of the electricity measuring.
Description
(1) technical field
The utility model relates to a kind of electric power metering device, especially a kind of polytropic ratio three-phase power batch meter.
(2) background technology
Common, electric metering box comprises casing, two voltage transformer (VT), two current transformers and measures ammeter, record the electric current and the voltage of circuit by voltage transformer (VT) and current transformer, be connected with the measurement ammeter by the secondary connection plate, can measure the active power and the reactive power of three-phase alternating current.The current transformer current ratio is single, and when having only unique current ratio, when peak of power consumption and low power consumption variation, the variation of line current is bigger, if having only a current ratio, electric energy metrical is inaccurate so; Even if adopted two no-load voltage ratios,, still can not satisfy user's needs though increased measurement range.Generally need the current transformer of polytropic ratio could guarantee the accuracy of electric energy metrical.As the patent No. is 02135228.3, patent name is the patent of invention of multi-ratio load electric power metering device, a kind of multi-ratio load electric power metering device is disclosed, two polytropic ratio current transformers of this device are connected on A phase, C phase, the polytropic ratio tap of its secondary side connects the observing and controlling ammeter through auxiliary reclay, current transformer wherein adopts three to five no-load voltage ratios, it is the tap that secondary side winding has three to five different numbers of turn, the conversion of no-load voltage ratio can be carried out according to different needs, electric energy can be measured more accurately.But it also exists shortcoming, and current transformer has only secondary side to be provided with tap, and primary side is not established tap, and the selectivity ratios of current ratio is less, and the precision of Ce Lianging can not well guarantee so.So the structure of electric metering box awaits further improvement.
(3) summary of the invention
In order to overcome the not high deficiency of electric metering box measuring accuracy in the prior art, the utility model provides a kind of novel polytropic ratio three-phase power batch meter, not only the secondary side at two current transformers is provided with a plurality of taps, also be provided with a plurality of taps at its primary side, can better realize a plurality of no-load voltage ratios, thereby guarantee the accurate of electric energy metrical.
The technical scheme that its technical matters that solves the utility model adopts is:
A kind of polytropic ratio three-phase power batch meter, comprise casing, first voltage transformer (VT), second voltage transformer (VT), first current transformer, second current transformer, between the described casing and first voltage transformer (VT), second voltage transformer (VT), first current transformer, second current transformer insulating medium is arranged, described first voltage transformer (VT) once terminate at A phase, B mutually between, described second voltage transformer (VT) once terminate at B phase, C mutually between; Described first current transformer is once held with A and is connected, and described second current transformer is connected with C; The secondary terminals of described first current transformer, second current transformer is provided with a plurality of taps, the secondary terminals of described first voltage transformer (VT), second voltage transformer (VT), first current transformer, second current transformer is connected with the secondary connection plate respectively, the secondary connection plate is connected with the measurement ammeter, and the once end of described first current transformer, second current transformer is provided with a plurality of taps.
Further, the once end of described first current transformer, second current transformer is provided with three taps, and the secondary terminals of described first current transformer, second current transformer is provided with three taps.
Further again, described insulating medium is an insulating oil.
Further, described insulating medium is an epoxy resin.
The beneficial effect of polytropic ratio three-phase power batch meter described in the utility model mainly shows: 1, the primary side at first current transformer, second current transformer is provided with a plurality of taps, the user is according to the size of line current, can to once, secondary carries out compounding practice, appropriate selection no-load voltage ratio, thus the accurate of circuit electric energy metrical guaranteed; 2, adopted insulating oil or epoxy resin as insulating material, can make whole measuring apparatus working stability.
(4) description of drawings
Fig. 1 is the wiring schematic diagram of polytropic ratio three-phase power batch meter described in the utility model;
Fig. 2 is the elementary diagram of polytropic ratio three-phase power batch meter described in the utility model.
(5) embodiment
Below in conjunction with accompanying drawing the utility model is described further.
With reference to figure 1, Fig. 2, a kind of polytropic ratio three-phase power batch meter, it is the oil-immersed type power batch meter, comprise casing 1, first voltage transformer pt 1, second voltage transformer pt 2, the first current transformer CT1, the second current transformer CT2, insulating medium in the casing 1 is an insulating oil, first voltage transformer pt 1 once terminate at A phase, B mutually between, second voltage transformer pt 2 once terminate at B phase, C mutually between, i.e. high-pressure side; The once end of the first current transformer CT1 is connected with A, and the second current transformer CT2 is connected with C; The secondary terminals of first voltage transformer pt 1, second voltage transformer pt 2, the first current transformer CT1, the second current transformer CT2 is connected with secondary connection plate 2 respectively, be that low pressure end is connected with the secondary connection plate, the secondary voltage of voltage transformer (VT) is normal voltage 100V, the secondary current of current transformer is normalized current 5A, secondary connection plate 2 is connected with the measurement ammeter, the once end of the first current transformer CT1, the second current transformer CT2 is provided with three taps, and the secondary terminals of the first current transformer CT1, the second current transformer CT2 is provided with three taps.The first current transformer CT1 is identical with the second current transformer CT2 current ratio, and the accuracy rating and first and second number of turn are identical, and the mode of connection is just the same, and different is that the first current transformer CT1 is connected on the A phase, and the second current transformer CT2 is connected on the C phase; First voltage transformer pt 1 is identical with the accuracy rating and first and second number of turn of second voltage transformer pt 2, in Fig. 1, A is the secondary side extension line of outstanding current transformer mutually, and an extension line is with the C phase, C is the secondary side extension line of outstanding current transformer mutually, and an extension line is with the A phase.
First voltage transformer pt 1 once terminate at A phase, B mutually between, second voltage transformer pt 2 once terminate at B phase, C mutually between; The once end of the first current transformer CT1 is connected with A, the primary side of the second current transformer CT2 is connected with C, the once end of CT1 is provided with AP1, AP2, AP3, AP4 contact, promptly the first current transformer CT1 is the beginning counting end with AP1, be provided with three taps, the once end of CT2 is provided with CP1, CP2, CP3, CP4 contact, and promptly the second current transformer CT2 is the beginning counting end with CP1, also is provided with three taps.Secondary connection plate 2 is provided with 12 contacts, secondary connection plate 2 with measure ammeter and be connected and carry out electric energy metrical, the measurement ammeter comprises idle ammeter 3, power electric meter 4.The secondary terminals of first voltage transformer pt 1 is connected between a, b contact of terminal block, and the secondary terminals of second voltage transformer pt 2 is connected between the b of terminal block, the c contact, and the secondary terminals of CT1 and CT2 is provided with common port, its common port S
2Be connected on the 1S of terminal block
2, 2S
2, 3S
2On the contact, other exit of the secondary side of CT1 is connected on the contact of terminal block, and other exit of the secondary terminals of CT2 is connected on the 1S of terminal block
3, 2S
3, 3S
3On the contact.By with the cooperating of primary side wiring, external measurement ammeter is connected with a, the b of secondary connection plate 2, c contact, simultaneously and 1S
1, 1S
2, 1S
3, 2S
1, 2S
2, 2S
3, 3S
1, 3S
2, 3S
3Electric energy metrical is carried out in one group of connection wherein, with reference to Fig. 2,1S
1, 1S
2, 1S
3Group is connected with idle ammeter 3, power electric meter 4 to be measured.Other two groups of 2S
1, 2S
2, 2S
3, 3S
1, 3S
2, 3S
3Measurement, as long as secondary connection plate 2 on reconfiguration just can realize equally.
The course of work of polytropic ratio electric metering box described in the utility model: the first side winding of the first current transformer CT1 is reference edge with AP1, AP1-AP2 is 600 ampere-turns, AP1-AP3 is 900 ampere-turns, AP1-AP4 is 1200 ampere-turns, the first side winding of current transformer CT2 is reference edge with CP1, CP1-CP2 is 600 ampere-turns, and CP1-CP3 is 900 ampere-turns, and CP1-CP4 is 1200 ampere-turns.According to size, class of accuracy and the specified secondary load of primary current, determine the number of turn one time.Because primary current can rise to 300A or higher from 5A, if primary current is 5A, one time ampere turns can be selected 600 ampere-turns, 900 ampere-turns, 1200 ampere-turns for use, and one time the number of turn can be respectively 120 circles, 180 circles, 240 circles; If primary current is 300A, one time ampere turns can be selected 600 ampere-turns, 900 ampere-turns, 1200 ampere-turns for use, and one time the number of turn can be respectively 2 circles, 3 circles, 4 circles.The selection of the primary side number of turn will be carried out Error Calculation according to magnetic bobbin core cross section, magnetic flux density and specified secondary load again according to current ratio, the class of accuracy of customer requirements.If rated current is 300A, the customer requirements class of accuracy is 0.2 grade, secondary load 20VA, select for use 2 circles to calculate earlier,, select for use 3 circles, 900 ampere-turns to calculate again if result of calculation does not reach 0.2 grade, just select 3 circles for use if precision can reach 0.2 grade, just do not select 2 circles and 4 circles for use.In like manner, other current ratio also can use the same method to calculate and determine a number of turn, and one time the number of turn is not changeless.
Polytropic ratio electric metering box described in the utility model, can the user according to the size of line current, by the first current transformer CT1 and the second current transformer CT2 once, the variation of secondary connection terminal, design a plurality of no-load voltage ratios, thereby guarantee circuit electric energy accurate measurement.
With reference to figure 1, Fig. 2, a kind of polytropic ratio three-phase power batch meter, it is epoxy casting formula electric metering box, comprise casing 1, first voltage transformer pt 1, second voltage transformer pt 2, the first current transformer CT1, the second current transformer CT2, insulating medium in the casing 1 is an epoxy resin, first voltage transformer pt 1 once terminate at A phase, B mutually between, second voltage transformer pt 2 once terminate at B phase, C mutually between, i.e. high-pressure side; The once end of the first current transformer CT1 is connected with A, and the second current transformer CT2 is connected with C; The secondary terminals of first voltage transformer pt 1, second voltage transformer pt 2, the first current transformer CT1, the second current transformer CT2 is connected with secondary connection plate 2 respectively, be that low pressure end is connected with the secondary connection plate, the secondary current of current transformer is normalized current 5A, the secondary connection plate is connected with the measurement ammeter, and the once end of the first current transformer CT1, the second current transformer CT2 is provided with three branch taps.The first current transformer CT1 is identical with the second current transformer CT2 current ratio, and the accuracy rating and first and second number of turn are identical, and the mode of connection is just the same, and different is that the first current transformer CT1 is connected on the A phase, and the second current transformer CT2 is connected on the C phase; First voltage transformer pt 1 is identical with the accuracy rating and first and second number of turn of second voltage transformer pt 2.
The mode of connection and principle of work are identical with embodiment 1.
Claims (4)
1, a kind of polytropic ratio three-phase power batch meter, comprise casing, first voltage transformer (VT), second voltage transformer (VT), first current transformer, second current transformer, between the described casing and first voltage transformer (VT), second voltage transformer (VT), first current transformer, second current transformer insulating medium is arranged, described first voltage transformer (VT) once terminate at A phase, B mutually between, described second voltage transformer (VT) once terminate at B phase, C mutually between; Described first current transformer is once held with A and is connected, and described second current transformer is connected with C; The secondary terminals of described first current transformer, second current transformer is provided with a plurality of taps, the secondary terminals of described first voltage transformer (VT), second voltage transformer (VT), first current transformer, second current transformer is connected with the secondary connection plate respectively, the secondary connection plate is connected with the measurement ammeter, and it is characterized in that: the once end of described first current transformer, second current transformer is provided with a plurality of taps.
2, polytropic ratio three-phase power batch meter as claimed in claim 1, the once end that it is characterized in that described first current transformer, second current transformer is provided with three taps, and the secondary terminals of described first current transformer, second current transformer is provided with three taps.
3, polytropic ratio three-phase power batch meter as claimed in claim 2 is characterized in that described insulating medium is an insulating oil.
4, polytropic ratio three-phase power batch meter as claimed in claim 2 is characterized in that described insulating medium is an epoxy resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03270376 CN2653519Y (en) | 2003-09-23 | 2003-09-23 | Multiple change ratio three-phase powder meter box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03270376 CN2653519Y (en) | 2003-09-23 | 2003-09-23 | Multiple change ratio three-phase powder meter box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2653519Y true CN2653519Y (en) | 2004-11-03 |
Family
ID=34330466
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03270376 Expired - Fee Related CN2653519Y (en) | 2003-09-23 | 2003-09-23 | Multiple change ratio three-phase powder meter box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2653519Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103513085A (en) * | 2013-09-29 | 2014-01-15 | 国家电网公司 | Current transformer capable of switching transformation ratios for metering off-grid energy of wind power plants |
| CN104637663A (en) * | 2015-03-02 | 2015-05-20 | 国网四川省电力公司成都供电公司 | Integrated multi-transformation-ratio transformer and data collection method thereof |
-
2003
- 2003-09-23 CN CN 03270376 patent/CN2653519Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103513085A (en) * | 2013-09-29 | 2014-01-15 | 国家电网公司 | Current transformer capable of switching transformation ratios for metering off-grid energy of wind power plants |
| CN103513085B (en) * | 2013-09-29 | 2016-02-10 | 国家电网公司 | The changeable transformation ratio current transformer of the off line electric quantity metering of wind energy turbine set |
| CN104637663A (en) * | 2015-03-02 | 2015-05-20 | 国网四川省电力公司成都供电公司 | Integrated multi-transformation-ratio transformer and data collection method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20041103 Termination date: 20110923 |