CN204405832U - Novel site powermeter verification instrumeter - Google Patents
Novel site powermeter verification instrumeter Download PDFInfo
- Publication number
- CN204405832U CN204405832U CN201520139192.4U CN201520139192U CN204405832U CN 204405832 U CN204405832 U CN 204405832U CN 201520139192 U CN201520139192 U CN 201520139192U CN 204405832 U CN204405832 U CN 204405832U
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- amperemeter
- clamp
- current
- circuit
- offset circuit
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- 238000012795 verification Methods 0.000 title claims abstract description 9
- 238000012360 testing method Methods 0.000 claims abstract description 11
- 230000004907 flux Effects 0.000 claims abstract description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000004804 winding Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012857 repacking Methods 0.000 description 1
Abstract
The utility model discloses a kind of Novel site powermeter verification instrumeter, comprise clamp on amperemeter, described clamp on amperemeter is provided with the alternating current-direct current testing circuit for detecting the ac and dc current by clamp on amperemeter; Also comprise a DC offset circuit, the magnetic flux that described DC offset circuit produces for offsetting clamp on amperemeter DC component.The alternating current-direct current testing circuit that the utility model consists of Hall element, detect the ac and dc current by pincerlike meter, and driven by DC offset circuit, pass through compensating coil, a reverse magnetic flux is injected to the iron core of pincerlike meter, make the magnetic core in pincerlike meter can not be saturated, therefore under can there is DC component situation in Measurement accuracy load, the true error of electric energy meter, improve the measuring accuracy of clamp on amperemeter, solve the practical problemss such as the metering difference existed between client's electric energy meter at the scene of being arranged on and metering summary table.
Description
Technical field
The utility model relates to powermeter verification instrumeter.
Background technology
Often following phenomenon can be found in field-checking and circuit inspection process:
1. verify qualified electric energy meter in laboratory and but find that in working site checking data exists larger error
2. there is larger error in the electrical energy metering data be arranged between on-the-spot client's electric energy meter and metering summary table, does not also find live cable road repacking situation.
Through a large amount of data tests and analysis, find that reason is as follows:
There is DC component in load can cause the iron core of forcipated mutual-inductor to enter zone of saturation, under theoretical case, electric current in a winding of mutual inductor all will be used for excitation, mutual inductor secondary current is 0, truly can not reflect the size of primary current, thus affect the measuring accuracy of clamp on amperemeter, make field-checking operational failure, time serious, even can damage equipment.
Utility model content
Technical problem to be solved in the utility model is just to provide a kind of Novel site powermeter verification instrumeter, improves the measuring accuracy of clamp on amperemeter.
For solving the problems of the technologies described above, the utility model adopts following technical scheme: Novel site powermeter verification instrumeter, comprises clamp on amperemeter, and described clamp on amperemeter is provided with the alternating current-direct current testing circuit for detecting the ac and dc current by clamp on amperemeter; Also comprise a DC offset circuit, the magnetic flux that described DC offset circuit produces for offsetting clamp on amperemeter DC component.
Preferably, described alternating current-direct current testing circuit is made up of Hall element and peripheral circuit thereof.
Preferably, described DC offset circuit is the DC compensation coil be located in clamp on amperemeter, and described DC compensation coil injects a reverse magnetic flux to the iron core of clamp on amperemeter.
The alternating current-direct current testing circuit that the utility model consists of Hall element, detect the ac and dc current by pincerlike meter, and driven by DC offset circuit, pass through compensating coil, a reverse magnetic flux is injected to the iron core of pincerlike meter, make the magnetic core in pincerlike meter can not be saturated, therefore under can there is DC component situation in Measurement accuracy load, the true error of electric energy meter, improve the measuring accuracy of clamp on amperemeter, solve the practical problemss such as the metering difference existed between client's electric energy meter at the scene of being arranged on and metering summary table.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is further described:
Fig. 1 is theory diagram of the present utility model.
Embodiment
In clamp on amperemeter, if there is DC component, through integration in current transformer winding, magnetic flux will be made to increase, until saturated, now always, electric current in a winding of mutual inductor all will be used for excitation, and mutual inductor secondary current is 0, truly can not reflect the size of primary current.So, theoretically, as long as make the magnetic linkage of current transformer not enter zone of saturation just can avoid this problem, Here it is our resolving ideas.
Based on above consideration, theory diagram of the present utility model as shown in Figure 1: it comprises clamp on amperemeter, and described clamp on amperemeter is provided with the alternating current-direct current testing circuit for detecting the ac and dc current by clamp on amperemeter; Also comprise a DC offset circuit, the magnetic flux that described DC offset circuit produces for offsetting clamp on amperemeter DC component.
Described alternating current-direct current testing circuit is made up of Hall element and peripheral circuit thereof, described DC offset circuit is the DC compensation coil be located in clamp on amperemeter, the alternating current-direct current testing circuit formed by Hall element, detect the ac and dc current by pincerlike meter, and driven by DC offset circuit, by compensating coil, inject a reverse magnetic flux to the iron core of pincerlike meter, make the magnetic core in pincerlike meter can not be saturated.
Claims (3)
1. Novel site powermeter verification instrumeter, comprises clamp on amperemeter, it is characterized in that: described clamp on amperemeter is provided with the alternating current-direct current testing circuit for detecting the ac and dc current by clamp on amperemeter; Also comprise a DC offset circuit, the magnetic flux that described DC offset circuit produces for offsetting clamp on amperemeter DC component.
2. Novel site powermeter verification instrumeter according to claim 1, is characterized in that: described alternating current-direct current testing circuit is made up of Hall element and peripheral circuit thereof.
3. Novel site powermeter verification instrumeter according to claim 1, is characterized in that: described DC offset circuit is the DC compensation coil be located in clamp on amperemeter, and described DC compensation coil injects a reverse magnetic flux to the iron core of clamp on amperemeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520139192.4U CN204405832U (en) | 2015-03-12 | 2015-03-12 | Novel site powermeter verification instrumeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520139192.4U CN204405832U (en) | 2015-03-12 | 2015-03-12 | Novel site powermeter verification instrumeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204405832U true CN204405832U (en) | 2015-06-17 |
Family
ID=53429681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520139192.4U Active CN204405832U (en) | 2015-03-12 | 2015-03-12 | Novel site powermeter verification instrumeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204405832U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749547A (en) * | 2015-03-12 | 2015-07-01 | 国家电网公司 | Novel on-site power meter calibration instrument |
| CN106646308A (en) * | 2016-10-27 | 2017-05-10 | 优利德科技(中国)有限公司 | Full-automatic calibration method and calibration device for Hall clamp meter |
-
2015
- 2015-03-12 CN CN201520139192.4U patent/CN204405832U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749547A (en) * | 2015-03-12 | 2015-07-01 | 国家电网公司 | Novel on-site power meter calibration instrument |
| CN106646308A (en) * | 2016-10-27 | 2017-05-10 | 优利德科技(中国)有限公司 | Full-automatic calibration method and calibration device for Hall clamp meter |
| CN106646308B (en) * | 2016-10-27 | 2023-04-14 | 优利德科技(中国)股份有限公司 | Full-automatic calibration method and device for Hall clamp meter |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |