CA1069586A - Transducer for the measurement of polyphase current independently of frequency - Google Patents
Transducer for the measurement of polyphase current independently of frequencyInfo
- Publication number
- CA1069586A CA1069586A CA275,525A CA275525A CA1069586A CA 1069586 A CA1069586 A CA 1069586A CA 275525 A CA275525 A CA 275525A CA 1069586 A CA1069586 A CA 1069586A
- Authority
- CA
- Canada
- Prior art keywords
- core
- transducer
- winding
- frequency
- polyphase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000005259 measurement Methods 0.000 title claims abstract description 4
- 238000004804 winding Methods 0.000 claims abstract description 15
- 230000004907 flux Effects 0.000 abstract description 3
- 238000009499 grossing Methods 0.000 description 1
- 230000003455 independent Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/38—Instruments transformers for polyphase AC
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Transformers For Measuring Instruments (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
Abstract-of the Disclosure A transducer for the measurement of a polyphase current independent of frequency has a laminated magnetic core consisting of two rings separated from one another by a gap. At this gap there are slots with a winding connec-ted to the polyphase current system to be measured. Over the circumference of the yoke of the core there is wound a measuring winding which has no magnetic linkage with the polyphase winding. This measuring winding is sup-plied with measuring voltage of sufficiently high frequency for the variation in impedance in the measuring winding due to the variation in magnetic flux in the yoke to be measured.
Description
lQ69S~6 This invention relates to a transducer for measuring the r.m.s.
value of a polyphase current independent of frequency rendering it possible to convert the r.m.s. value of the approximately sinusoidally alternating currents into a direct voltage.
The r.m.s. value of a polyphase system of currents has not been so far measured. The current value has been measured in one phase only by measuring the voltage drop over a shunt connected with an analog or digital voltmeter.
The aim of the present invention is to achieve control of a poly-phase current system in case of rapid variations in its value in systems ofcontrolled frequency.
According to the present invention, there is provided a transducer for the measurement of the r.m.s. value of a polyphase current system inde-pendent of frequency, comprising: a magnetic core consisting of two parts, a first part separated from the other part by a gap at least one part of the said core being provided with teeth and slots situated at said gap, a poly-phase winding arranged in said slots for conducting the polyphase current system thereby magnetizing the core, a yoke on the said first part of the magnetic core, upon which there is uniformly wound a measuring winding having terminals for applying alternating voltage of sufficiently high frequency that variations of the magnetic saturation of the yoke cause a detectable change of the impedance of the transducer.
The invention will now be described in greater detail with reference to the accompanying drawings, which is a fragmentary view of a transducer according to the invention.
A measuring winding 1 is wound on an external yoke 2 of a two part laminated core. The outer part of the core which includes the yoke 2 has slots 3 and teeth 4.
An inner 6 part which may be ring-shaped or disc-shaped, of the core is spaced from the outer part to define a gap 5. In the slots 3 there is laid .: -1- ~
." ~
~.a~9586 a polyphase winding similar to windings commonly used in induction motors.
This winding is connected to the polyphase current system being measured.
The excited magnetic flux permeates through the gap 5, teeth 4, and the yoke
value of a polyphase current independent of frequency rendering it possible to convert the r.m.s. value of the approximately sinusoidally alternating currents into a direct voltage.
The r.m.s. value of a polyphase system of currents has not been so far measured. The current value has been measured in one phase only by measuring the voltage drop over a shunt connected with an analog or digital voltmeter.
The aim of the present invention is to achieve control of a poly-phase current system in case of rapid variations in its value in systems ofcontrolled frequency.
According to the present invention, there is provided a transducer for the measurement of the r.m.s. value of a polyphase current system inde-pendent of frequency, comprising: a magnetic core consisting of two parts, a first part separated from the other part by a gap at least one part of the said core being provided with teeth and slots situated at said gap, a poly-phase winding arranged in said slots for conducting the polyphase current system thereby magnetizing the core, a yoke on the said first part of the magnetic core, upon which there is uniformly wound a measuring winding having terminals for applying alternating voltage of sufficiently high frequency that variations of the magnetic saturation of the yoke cause a detectable change of the impedance of the transducer.
The invention will now be described in greater detail with reference to the accompanying drawings, which is a fragmentary view of a transducer according to the invention.
A measuring winding 1 is wound on an external yoke 2 of a two part laminated core. The outer part of the core which includes the yoke 2 has slots 3 and teeth 4.
An inner 6 part which may be ring-shaped or disc-shaped, of the core is spaced from the outer part to define a gap 5. In the slots 3 there is laid .: -1- ~
." ~
~.a~9586 a polyphase winding similar to windings commonly used in induction motors.
This winding is connected to the polyphase current system being measured.
The excited magnetic flux permeates through the gap 5, teeth 4, and the yoke
2 ancl core part 6. This flux is not linked with the measuring winding 1 but magnetizes the magnetic yoke 2 on which it is wound. In consequence, across the terminals la of the measuring winding 1 which is supplied with an alter-nating measuring voltage of sufficiently high frequency appear variations of impedance of the transducer, these being a function of the r.m.s. value of the polyphase current system.
These variations are converted, e.g. in a bridge system - into an alternating voltage having the frequency of the measuring voltage, which upon rectifying and smoothing may be used for control purposes.
An essential advantage of the convertor is its simple design and galvanic separation of the derived signal from the electric circuit of the current system.
" .. ..
These variations are converted, e.g. in a bridge system - into an alternating voltage having the frequency of the measuring voltage, which upon rectifying and smoothing may be used for control purposes.
An essential advantage of the convertor is its simple design and galvanic separation of the derived signal from the electric circuit of the current system.
" .. ..
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A transducer for the measurement of the r.m.s. value of a poly-phase current system independent of frequency, comprising: a magnetic core consisting of two parts, a first part separated from the other part by a gap, at least one part of the said core being provided with teeth and slots situated at said gap, a polyphase winding arranged in said slots for con-ducting the polyphase current system thereby magnetizing the core, a yoke on the said first part of the magnetic core, upon which there is uniformly wound a measuring winding having terminals for applying alternating voltage of sufficiently high frequency that variations of the magnetic saturation of the yoke cause a detectable change of the impedance of the transducer.
2. A transducer according to claim 1, in which the core is laminated.
3. A transducer according to claim 1, wherein the first part of the core is ring-shaped and located outwardly of the other part which is located concentrically inside the first part and is also ring-shaped.
4. A transducer according to claim 1, wherein the first part of the core is ring-shaped and located outwardly of the other part which is located concentrically inside the first part and is disc-shaped.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL18852676A PL105773B1 (en) | 1976-04-05 | 1976-04-05 | TRANSDUCER FOR MEASURING CURRENT VALUES IN MULTIPHASE SYSTEMS, FREQUENCY INDEPENDENT |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1069586A true CA1069586A (en) | 1980-01-08 |
Family
ID=19976294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA275,525A Expired CA1069586A (en) | 1976-04-05 | 1977-04-04 | Transducer for the measurement of polyphase current independently of frequency |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS52121371A (en) |
| CA (1) | CA1069586A (en) |
| DE (1) | DE2714717A1 (en) |
| PL (1) | PL105773B1 (en) |
-
1976
- 1976-04-05 PL PL18852676A patent/PL105773B1/en unknown
-
1977
- 1977-04-01 DE DE19772714717 patent/DE2714717A1/en not_active Withdrawn
- 1977-04-04 JP JP3771077A patent/JPS52121371A/en active Pending
- 1977-04-04 CA CA275,525A patent/CA1069586A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2714717A1 (en) | 1977-10-20 |
| PL105773B1 (en) | 1979-10-31 |
| JPS52121371A (en) | 1977-10-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4810954A (en) | Poynting vector probe for measuring electrical power | |
| CA1303155C (en) | Electromagnetic shield for electromagnetic apparatus | |
| CA1069586A (en) | Transducer for the measurement of polyphase current independently of frequency | |
| US4160950A (en) | Current measuring apparatus | |
| JPH08220141A (en) | Split dc zero-phase current transformer | |
| JPS6212646B2 (en) | ||
| SU775764A1 (en) | Controllable reactor | |
| CN110648835A (en) | Three-phase current synthesis type zero sequence transformer | |
| US3333192A (en) | Second harmonic magnetic modulator measuring system | |
| JPS54115174A (en) | Current detector | |
| US3808530A (en) | Direct current ampere-hour meter | |
| SU1744752A1 (en) | Device for protection of three-phase load against emergency operation | |
| JPH0536228Y2 (en) | ||
| SU911356A1 (en) | Galvano-magnetic measuring converter of power | |
| SU662983A1 (en) | Current transformer | |
| JPS6317510A (en) | Dc transformer | |
| SU845106A1 (en) | Transformer-type ac bridge | |
| GB2017921A (en) | Magnetic field direction | |
| SU1200348A1 (en) | Converter for contactless transmission of electric signals which change slowly from rotating object | |
| JPS54153248A (en) | Current controller | |
| SU920865A1 (en) | Dc-to-ac converter | |
| JPS6042504Y2 (en) | magnetic amplifier | |
| SU987421A1 (en) | Electrical machine winding temperature measuring device | |
| JPH0222529B2 (en) | ||
| SU989659A1 (en) | Device for protecting three-phase electric plant from asymmetric modes |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |