CN1069342A - Pliers type electric power meter - Google Patents
Pliers type electric power meter Download PDFInfo
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- CN1069342A CN1069342A CN 91105513 CN91105513A CN1069342A CN 1069342 A CN1069342 A CN 1069342A CN 91105513 CN91105513 CN 91105513 CN 91105513 A CN91105513 A CN 91105513A CN 1069342 A CN1069342 A CN 1069342A
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- electric power
- logarithm
- shunt
- electric
- current transformer
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- 238000013341 scale-up Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 1
- 210000000080 chela (arthropods) Anatomy 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Abstract
The major technique feature of pliers type electric power meter is that pliers type electric power meter is made up of split core type current transformer, electric power gear current transformer, logarithm shunt, gauge outfit etc., wherein the logarithm shunt is its chief component, it is actually a divert shunt resistor, by changing its resistance size, to the reometer shunting, thereby make electric current can accurately reflect the electric power size by reometer.
The present invention can be used for detecting actual electric power on the low-voltage circuit, electric rating.
Description
Pliers type electric power meter belongs to electric instrument.
Pliers type electric power meter is made up of split core type current transformer, electric power gear current transformer, logarithm shunt, gauge outfit (comprising magneto-electric reometer, rectifier cell etc.) etc.Split core type current transformer records size of current on the circuit, after electric power gear current transformer unsteady flow electric current is imported gauge outfit according to the electric power size again.Because when electric current is constant, electric power changes with change in voltage, a logarithm shunt in parallel in circuit with gauge outfit, the logarithm shunt indicates electric rating, two kinds of different magnitudes of voltage of actual electric power, magnitude of voltage shunting during according to detection electric rating or actual electric power, guaranteeing can accurately reflecting the electric power size by the size of current of magneto-electric reometer, on meter dial with the electric power numeric representation it.
Detect phase three-wire three, three-phase and four-line circuit electric power method with the single-phase electricity power meter with pliers type electric power meter.
List of references: " eelctrical engineering handbook ", petroleum industry publishing house publishes, the 1st edition the 1st printing in Beijing in August nineteen ninety, (1) electric instrument, the 1473rd page; (2) tong ammeter, the 1495th page; (3) use of ac power meter and verification, the 1499th page.
Pliers type electric power meter can detect actual electric power, the electric rating of various low-voltage circuits, easy-to-operate at any time under the situation that does not influence supply line's normally.
Pliers type electric power meter is made up of split core type current transformer, electric power gear current transformer, logarithm shunt, gauge outfit (comprising magneto-electric reometer, rectifier cell, resistance etc.) etc.Consult Figure of description Fig. 1, split core type current transformer provides the size of electric current on current source and the reflection detected circuit for testing, size of current input electric power gear current transformer is detected in institute, according to detected circuit electric power size, change the size of current of split core type current transformer input, provide the secondary current source for detecting different gear electric power values, the input gauge outfit.Because when electric current is constant, electric power changes with change in voltage, a logarithm shunt in parallel in circuit with gauge outfit, the logarithm shunt indicates electric rating, two kinds of different magnitudes of voltage of actual electric power, magnitude of voltage shunting during according to detection electric rating or actual electric power, to guarantee accurately to reflect the electric power size, on meter dial, represent it with the electric power respective value by the size of current of magneto-electric reometer.The logarithm shunt is the chief component of pliers type electric power meter, it is actually a divert shunt resistor, when different voltage, its resistance value prediction equation is: establishing ammeter resistance is Rg, when voltage was U, establishing logarithm shunt resistance value was Rs, and establishes Rg/Rs=a(wherein: U is a reference voltage, a is shunting scale-up factor, a＞1).
When voltage is nu:
When detecting actual electric power, logarithm shunt resistance value is:
Rx＝ (an)/(1+a-n) ·Rs
When detecting electric rating, logarithm shunt resistance value is:
Rx＝ (a)/(an+n-1) ·Rs
The single-phase electricity power that pliers type electric power meter is produced than prior art has novelty, creativeness, practicality, shows as electric power meter that prior art produces and must cut off circuit and be series in the circuit, complicated operation and have danger; And pliers type electric power meter is simple in structure, and easy-to-operate under the situation that does not influence supply line's normally, can detect the actual electric power of various low-voltage circuits at any time, two kinds of electric power of electric rating.
Figure of description Fig. 1 explanation: (1) clamp current transformer among the figure, detected lead is equivalent to the first siding ring of current transformer; (2) be electric power gear current transformer, be actually a multitap current transformer; (3) be the logarithm shunt, it is actually an adjustable resistor or resistance resistance group more than; (4) be that the gauge outfit part is made up of magneto-electric reometer, integer element, resistance etc.
The best way that realizes pliers type electric power meter is to increase electric current, voltage sense line in the pliers type electric power meter circuit, makes pincerlike multimeter, enlarges usable range.Consult accompanying drawing 2, when dotted portion represents to select this gear among Fig. 2, two junction closures that dotted line connects, this pincerlike multimeter can be used for detecting alternating current, alternating voltage and actual electric power, two kinds of electric power of electric rating.
Claims (3)
- Pliers type electric power meter belongs to electric instrument.A kind of pliers type electric power meter is made up of split core type current transformer, electric power gear current transformer, logarithm shunt, gauge outfit etc.It is characterized in that:1, split core type current transformer: form by pincerlike iron core and a second siding ring.Because detected lead is equivalent to first siding ring, so have only a second siding ring.
- 2, electric power gear current transformer: be a kind of multitap current transformer, positive coil joins with the second siding ring of pincers row current transformer, and secondary coil has a plurality of taps, selects to use for measuring different gear electric power.
- 3, logarithm shunt: be a kind of adjustable resistor or a kind of many resistances resistance group, be connected in parallel with gauge outfit; The scale of logarithm shunt indicates two kinds of magnitudes of voltage, is respectively the magnitude of voltage when detecting actual electric power, electric rating, with the corresponding logarithm shunt of scale magnitude of voltage resistance value is:If ammeter resistance is Rg, when voltage was U, establishing logarithm shunt resistance value was Rs, and establishes Rg/Rs=a, (wherein: U is a reference voltage, and a is shunting scale-up factor, a＞1).When voltage is unWhen detecting actual electric power, logarithm shunt resistance value is:Rx＝ (an)/(1+a-n) ·RsWhen detecting electric rating, logarithm shunt resistance value is:Rx＝ (a)/(an+n-1) ·Rs4, gauge outfit: form by magneto-electric reometer, rectifier cell, resistance etc., magneto-electric reometer scale with the electric power numeric representation it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91105513 CN1069342A (en) | 1991-08-04 | 1991-08-04 | Pliers type electric power meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91105513 CN1069342A (en) | 1991-08-04 | 1991-08-04 | Pliers type electric power meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1069342A true CN1069342A (en) | 1993-02-24 |
Family
ID=4907200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91105513 Pending CN1069342A (en) | 1991-08-04 | 1991-08-04 | Pliers type electric power meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1069342A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103748475A (en) * | 2011-08-31 | 2014-04-23 | 松下电器产业株式会社 | Electricity meter |
| CN104267224A (en) * | 2014-09-19 | 2015-01-07 | 国家电网公司 | Ammeter clamp for measuring electricity consumptions of multiple lines |
| CN111736011A (en) * | 2020-05-19 | 2020-10-02 | 南方电网科学研究院有限责任公司 | A controllable zero-sequence current transformer |
-
1991
- 1991-08-04 CN CN 91105513 patent/CN1069342A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103748475A (en) * | 2011-08-31 | 2014-04-23 | 松下电器产业株式会社 | Electricity meter |
| CN104267224A (en) * | 2014-09-19 | 2015-01-07 | 国家电网公司 | Ammeter clamp for measuring electricity consumptions of multiple lines |
| CN111736011A (en) * | 2020-05-19 | 2020-10-02 | 南方电网科学研究院有限责任公司 | A controllable zero-sequence current transformer |
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