GB932704A - Apparatus for measuring the quotient of two electrical quantities - Google Patents
Apparatus for measuring the quotient of two electrical quantitiesInfo
- Publication number
- GB932704A GB932704A GB3785761A GB3785761A GB932704A GB 932704 A GB932704 A GB 932704A GB 3785761 A GB3785761 A GB 3785761A GB 3785761 A GB3785761 A GB 3785761A GB 932704 A GB932704 A GB 932704A
- Authority
- GB
- United Kingdom
- Prior art keywords
- proportional
- quotient
- voltage
- inductance
- current
- 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
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/40—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to ratio of voltage and current
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
- G01R27/10—Measuring resistance by measuring both voltage and current using two-coil or crossed-coil instruments forming quotient
- G01R27/12—Measuring resistance by measuring both voltage and current using two-coil or crossed-coil instruments forming quotient using hand generators, e.g. meggers
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06G—ANALOGUE COMPUTERS
- G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
- G06G7/12—Arrangements for performing computing operations, e.g. operational amplifiers
- G06G7/16—Arrangements for performing computing operations, e.g. operational amplifiers for multiplication or division
- G06G7/161—Arrangements for performing computing operations, e.g. operational amplifiers for multiplication or division with pulse modulation, e.g. modulation of amplitude, width, frequency, phase or form
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Power Engineering (AREA)
- Software Systems (AREA)
- Computer Hardware Design (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
932,704. Measuring impedance. BROWN, BOVERI & CO. Ltd. Oct. 23, 1961 [Oct. 25, 1960], No. 37857/61. Class 37. In an apparatus for measuring the quotient of two sinusoidal electrical quantities, e.g. impedance as a quotient of voltage (u) and current (i), the quantity (i), to be taken as the denominator of the quotient, is supplied to a parallel circuit consisting of a choke coil 1 and two Zener diodes 2 and 3 connected in series in opposite directions, in which it is converted into a quantity iz having a relative phase displacement proportional to the reciprocal value of i. Signals representing i and iz are fed to a phase comparator 8, which produces impulses the breadths of which are proportional to the phase displacement of iz, i.e. to the reciprocal of i. The amplitudes of these impulses are made proportional to the other quantity u, to be taken as the numerator of the quotient, so that the area of each impulse is proportional to the required quotient. Each impulse is then passed through an integrating circuit 10 which produces a triangular pulse whose peak amplitude is proportional to the quotient, and this peak value is indicated on the meter 11. The operation of the parallel circuit may be explained by reference to Fig. 2, where the input current i is shown in Fig. 2 (a), and the voltage that would normally appear across the inductance 1 if the current i passed through it is represented by curve U DR in Fig. 2 (b). This voltage at first is sufficiently large to cause the Zener diode 2 to conduct in its reverse direction, so that the reverse voltage U R2 across this diode is applied across the inductance 1, and the actual current through the inductance builds up as shown in Fig. 2 (c). The current through the diodes (iz = i - i DR ) therefore follows a curve as shown in Fig. 2 (a). At the point where i DR = i and iz = O the voltage across the Zener diode pair reverses, and i DR starts to fall. i DR depends only on the breakdown voltages of the Zener diodes and the value of the inductance 1 so that the largest phase differences #γ between iz and i occur for the smallest values of i (iz returns to zero more rapidly for smaller peak i) and it can be shown that this difference is rigorously proportional to 1/i. Voltages proportional to the currents i and iz are tapped across the resistorr 4 and 5 and converted in the peak limiters 6 and 7 into rectangular form. They are then supplied to a thyratron 8 which delivers an output pulse only when the two inputs are of different polarity, so that the width of this pulse is proportional to the phase difference between i and iz, i.e. proportional to 1/i. This pulse is then amplitude modulated by the voltage u in the unit 9, and eventually the quotient u/i is displayed on the meter 11 as above described.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1190260A CH383494A (en) | 1960-10-25 | 1960-10-25 | Electrical quotient meter, especially for protective devices |
Publications (1)
Publication Number | Publication Date |
---|---|
GB932704A true GB932704A (en) | 1963-07-31 |
Family
ID=4378000
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3785761A Expired GB932704A (en) | 1960-10-25 | 1961-10-23 | Apparatus for measuring the quotient of two electrical quantities |
Country Status (4)
Country | Link |
---|---|
BE (1) | BE609464A (en) |
CH (1) | CH383494A (en) |
GB (1) | GB932704A (en) |
NL (1) | NL268786A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3654424A (en) * | 1970-03-23 | 1972-04-04 | Robotron Corp | Quotient circuit |
NO342173B1 (en) * | 2016-12-15 | 2018-04-09 | Wirescan As | Method for measuring an impedance of an electric cable, a coupler arrangement and uses thereof |
-
0
- NL NL268786D patent/NL268786A/xx unknown
-
1960
- 1960-10-25 CH CH1190260A patent/CH383494A/en unknown
-
1961
- 1961-10-23 BE BE609464A patent/BE609464A/en unknown
- 1961-10-23 GB GB3785761A patent/GB932704A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3654424A (en) * | 1970-03-23 | 1972-04-04 | Robotron Corp | Quotient circuit |
NO342173B1 (en) * | 2016-12-15 | 2018-04-09 | Wirescan As | Method for measuring an impedance of an electric cable, a coupler arrangement and uses thereof |
NO20161993A1 (en) * | 2016-12-15 | 2018-04-09 | Wirescan As | Method for measuring an impedance of an electric cable, a coupler arrangement and uses thereof |
WO2018111115A1 (en) * | 2016-12-15 | 2018-06-21 | Wirescan As | Method for measuring an impedance of an electric cable, a coupler arrangement and uses thereof |
US11280849B2 (en) | 2016-12-15 | 2022-03-22 | Wirescan As | Method for measuring an impedance of an electric cable, a coupler arrangement and uses thereof |
Also Published As
Publication number | Publication date |
---|---|
BE609464A (en) | 1962-02-15 |
CH383494A (en) | 1964-10-31 |
NL268786A (en) |
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