CA1130379A - Measuring device for a high-tension installation - Google Patents
Measuring device for a high-tension installationInfo
- Publication number
- CA1130379A CA1130379A CA331,217A CA331217A CA1130379A CA 1130379 A CA1130379 A CA 1130379A CA 331217 A CA331217 A CA 331217A CA 1130379 A CA1130379 A CA 1130379A
- Authority
- CA
- Canada
- Prior art keywords
- transformer
- potential
- battery
- current
- voltage potential
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/22—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-emitting devices, e.g. LED, optocouplers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/142—Arrangements for simultaneous measurements of several parameters employing techniques covered by groups G01R15/14 - G01R15/26
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
- Dc-Dc Converters (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
ABSTRACT
In an arrangement for potential-free measurement of currents or voltages in high-tension installations, having a transformer at a high-voltage potential, through which the magnitude to be measured is picked up, the measurement information being passed, with an optical transmitter, from a high to a low voltage potential. The said transformer and or transmitter are fed from an auxiliary power source. According to the invention, the auxiliary power source is in the form of a battery adapted to be charged while the installation is in operation.
In an arrangement for potential-free measurement of currents or voltages in high-tension installations, having a transformer at a high-voltage potential, through which the magnitude to be measured is picked up, the measurement information being passed, with an optical transmitter, from a high to a low voltage potential. The said transformer and or transmitter are fed from an auxiliary power source. According to the invention, the auxiliary power source is in the form of a battery adapted to be charged while the installation is in operation.
Description
:- ~13~3~9 This invention relates to an arrangement for potential-ree measurement of currents or voltages in high-tension installations, having a transformer at a high voltage potential which picks up the magnitude to be measured, and having an optical transmitter whereby the measurement informa-tion is passed from a high to a low voltage potential, the said transformer and/or transmit~er being fed from an auxiliary power source. An arrangement o this kind is knot~n from German Patent 1,283,364.
The source of auxiliary power in this connection is a constant-voltage source not described in detail. If, for example, a battery is used for the purpose, a replacement is often necessary, due to use and age, and this involves shutting down the high-tension installation. In practic~, therefore, the auxiliary power for the transformer and transmitter is usually drawn from the high-tension network (German Patent 1,264,606). It is also conceivable, however, to obtain this auxiliary power from isolating-transformers and capacitors, but such types of power supply are costly and complex.
It is the purpose of the invention to reduce the cost and complexity o~ the circuitry required for providing this auxiliary power3 without the need for periodic shut-downs of the high-tension installation.
According to the invention, this purpose is achieved in that the auxiliary power source is in the form of a battery adapted to be charged while the unit is in operation. Since the ba~tery is being continuously recharged, it is unnecessary to shut the installation down in order to replace the auxiliary power source. Abo~e all, however, the cost of the circuitry is low.
According to a further development of the invention, the battery is charged by sunlight, or by photovoltaic elements irradiated by artificial light sources and/or the energy of the harmonic oscillations of the magnitude ~k , ., . ' '~
' ~3~37~
to be measured.
Thus, in accordance with the invention, there is provided an arrangement for the potential-free measurement in high-voltage power plants of a direct current affected by harmonic oscillations, having a transformer at a high voltage potential which detects the direct current to be measured, an optical transmitter over which measurement information is conducted from a high to a low potential, a battery at high-voltage potential as an auxiliary voltage source feeding the transformer and/or transmitter, characterized in that the battery can be charged by two charging generators at high voltage potential, decoupled by means of diodes, the one charging generator is in the form of a photo-voltaic element irradiated by sunlight or artificial light sources, and the other charging generator consists of a transformer which uses only harmonic oscillations present in the measured current, The invention is explained hereinafter in greater detail in conjunctLon with the example of embodiment illustrated in the drawing attached hereto, wherein:
Figure 1 is a wiring diagram of a high-tension installat-ion in which three-phase current is transformed into direct current, and Figure 2 illustrates a device for measuring the high-voltage direct current.
Figure 1 shows two current-converter groups 1, 2 which ' 2 ,.
,~ ' .
:. .-, .
3~3~i9 feed a direct-current double conductor (+ and - potentials) symmetrical with ground potential, for example from a three-phase ~ high-tension networ~ RST, for the purpose of transmitting high-- tension direct current.
The direct currents are measured by two transformers, usually so-called Kramer transformers or transformers which, in conjunction with parallel resistors, transform the voltage at the resistors into an alternating or direct voltage, or transformers based upon the Hall generator principle.
The alternating currents are dealt with by alternating-current transformers 5.
Figure 2 shows in greater detail the measuring device fitted to transformer 3. Current I to be measured is picked up ; in transformer 3 and is transformed, by a light-emitting element, not shown, into a light signal. A light-sensitive diode 9 is controlled by a light conductor (light-pipe) 8 to divide the potential, so that, with the aid of a digital signal, the intensity of the current may be measured there at a low potential. The auxiliary power for transformer 3 is supplied by a battery 6 which, in turn, is recharged by a photovoltaic element 7 and/or by the ~- harmonic oscillations of current I.
~, - 2a -, .. .. .
'`
, ' ' ,,' ' ~-'`
;, ~1~3()379 :
Two diodes 10, 11 prevent battery 6 from being discharged. Ir normal operation, i.e. when the high-tension installation is functioning, the alternating-current part of the direct current containing harmonic oscilla-tions is rectified and used to recharge the battery. If transformer 5, on the alternating-voltage side, is used instead of transformer 3 ~or 4), on the direct-voltage side, for measuring the current, the current may be a pure alternating current. Thus battery 6 is discharged only if no current I is . flowing. In the case of lengthy shut-downs, battery 6 is charged by the ~hotovoltaic element. Sinc~ transformer 3 requires little power, recharging battery 6 with current I may, if necessary, be dispensed with. Where little power is required, the light energy made available by the sun to photovoltaic element 7 is normally sufficient ~even in the shade). If longer periods of darkness are to be expected, ~he source of light may be artificial.
; As already indicated, the advantage of the circuit is to be perceived in its very low cost. Transformer 3, for example, may consist of a shunt, a simple vibrator, and an amplifier for control of the light-emitting element (a gallium-arsenide diode or a laser element). As the photovoltaic element passes from monocrystalline to polycrystalline structures, a very economical source of power becomes available. For ~ 20 instance, a power output of 1 W requires a crystal surface of only about 1 ;~ dm .
In addition to the current measurements described above, it is easy to measure volta~es and voltage commands to high-tension circuit elements, e.g. to the valves of rectifier groups 1, 2.
.
, .. . .
, .. :
' . : , .
,,' '~ ~
The source of auxiliary power in this connection is a constant-voltage source not described in detail. If, for example, a battery is used for the purpose, a replacement is often necessary, due to use and age, and this involves shutting down the high-tension installation. In practic~, therefore, the auxiliary power for the transformer and transmitter is usually drawn from the high-tension network (German Patent 1,264,606). It is also conceivable, however, to obtain this auxiliary power from isolating-transformers and capacitors, but such types of power supply are costly and complex.
It is the purpose of the invention to reduce the cost and complexity o~ the circuitry required for providing this auxiliary power3 without the need for periodic shut-downs of the high-tension installation.
According to the invention, this purpose is achieved in that the auxiliary power source is in the form of a battery adapted to be charged while the unit is in operation. Since the ba~tery is being continuously recharged, it is unnecessary to shut the installation down in order to replace the auxiliary power source. Abo~e all, however, the cost of the circuitry is low.
According to a further development of the invention, the battery is charged by sunlight, or by photovoltaic elements irradiated by artificial light sources and/or the energy of the harmonic oscillations of the magnitude ~k , ., . ' '~
' ~3~37~
to be measured.
Thus, in accordance with the invention, there is provided an arrangement for the potential-free measurement in high-voltage power plants of a direct current affected by harmonic oscillations, having a transformer at a high voltage potential which detects the direct current to be measured, an optical transmitter over which measurement information is conducted from a high to a low potential, a battery at high-voltage potential as an auxiliary voltage source feeding the transformer and/or transmitter, characterized in that the battery can be charged by two charging generators at high voltage potential, decoupled by means of diodes, the one charging generator is in the form of a photo-voltaic element irradiated by sunlight or artificial light sources, and the other charging generator consists of a transformer which uses only harmonic oscillations present in the measured current, The invention is explained hereinafter in greater detail in conjunctLon with the example of embodiment illustrated in the drawing attached hereto, wherein:
Figure 1 is a wiring diagram of a high-tension installat-ion in which three-phase current is transformed into direct current, and Figure 2 illustrates a device for measuring the high-voltage direct current.
Figure 1 shows two current-converter groups 1, 2 which ' 2 ,.
,~ ' .
:. .-, .
3~3~i9 feed a direct-current double conductor (+ and - potentials) symmetrical with ground potential, for example from a three-phase ~ high-tension networ~ RST, for the purpose of transmitting high-- tension direct current.
The direct currents are measured by two transformers, usually so-called Kramer transformers or transformers which, in conjunction with parallel resistors, transform the voltage at the resistors into an alternating or direct voltage, or transformers based upon the Hall generator principle.
The alternating currents are dealt with by alternating-current transformers 5.
Figure 2 shows in greater detail the measuring device fitted to transformer 3. Current I to be measured is picked up ; in transformer 3 and is transformed, by a light-emitting element, not shown, into a light signal. A light-sensitive diode 9 is controlled by a light conductor (light-pipe) 8 to divide the potential, so that, with the aid of a digital signal, the intensity of the current may be measured there at a low potential. The auxiliary power for transformer 3 is supplied by a battery 6 which, in turn, is recharged by a photovoltaic element 7 and/or by the ~- harmonic oscillations of current I.
~, - 2a -, .. .. .
'`
, ' ' ,,' ' ~-'`
;, ~1~3()379 :
Two diodes 10, 11 prevent battery 6 from being discharged. Ir normal operation, i.e. when the high-tension installation is functioning, the alternating-current part of the direct current containing harmonic oscilla-tions is rectified and used to recharge the battery. If transformer 5, on the alternating-voltage side, is used instead of transformer 3 ~or 4), on the direct-voltage side, for measuring the current, the current may be a pure alternating current. Thus battery 6 is discharged only if no current I is . flowing. In the case of lengthy shut-downs, battery 6 is charged by the ~hotovoltaic element. Sinc~ transformer 3 requires little power, recharging battery 6 with current I may, if necessary, be dispensed with. Where little power is required, the light energy made available by the sun to photovoltaic element 7 is normally sufficient ~even in the shade). If longer periods of darkness are to be expected, ~he source of light may be artificial.
; As already indicated, the advantage of the circuit is to be perceived in its very low cost. Transformer 3, for example, may consist of a shunt, a simple vibrator, and an amplifier for control of the light-emitting element (a gallium-arsenide diode or a laser element). As the photovoltaic element passes from monocrystalline to polycrystalline structures, a very economical source of power becomes available. For ~ 20 instance, a power output of 1 W requires a crystal surface of only about 1 ;~ dm .
In addition to the current measurements described above, it is easy to measure volta~es and voltage commands to high-tension circuit elements, e.g. to the valves of rectifier groups 1, 2.
.
, .. . .
, .. :
' . : , .
,,' '~ ~
Claims
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An arrangement for the potential-free measurement in high-voltage power plants of a direct current affected by harmonic oscillations, having a transformer at a high voltage potential which detects the direct current to be measured, an optical transmitter over which measurement information is conducted from a high to a low potential, a battery at high voltage potential as an auxiliary volt-age source feeding the transformer and/or transmitter, characterized in that the battery can be charged by two charging generators at high voltage potential, decoupled by means of diodes, the one charging generator is in the form of a photovol-taic element arradiated by sunlight or artificial light sources, and the other charging generator consists of a transformer which uses only harmonic oscillations present in the measured current.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP2829949.,2 | 1978-07-06 | ||
| DE19782829949 DE2829949C2 (en) | 1978-07-06 | 1978-07-06 | Arrangement for potential-free measurement of a direct current subject to harmonics in high-voltage systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1130379A true CA1130379A (en) | 1982-08-24 |
Family
ID=6043840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA331,217A Expired CA1130379A (en) | 1978-07-06 | 1979-07-05 | Measuring device for a high-tension installation |
Country Status (5)
| Country | Link |
|---|---|
| AT (1) | AT367210B (en) |
| BR (1) | BR7903609A (en) |
| CA (1) | CA1130379A (en) |
| DE (1) | DE2829949C2 (en) |
| IN (1) | IN150885B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3138073A1 (en) * | 1981-09-24 | 1983-04-14 | Siemens AG, 1000 Berlin und 8000 München | ARRANGEMENT FOR TRANSMITTING MEASURED VALUES TO A REMOTE SITE |
| DE3138074A1 (en) * | 1981-09-24 | 1983-04-14 | Siemens AG, 1000 Berlin und 8000 München | ARRANGEMENT FOR TRANSMITTING MEASURED VALUES TO A REMOTE SITE |
| DE3712190A1 (en) * | 1987-04-10 | 1988-10-27 | Bbc Brown Boveri & Cie | Electrical transformer |
| DE8809093U1 (en) * | 1988-07-15 | 1988-10-06 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt, De | |
| DE19941169A1 (en) * | 1999-08-30 | 2001-03-01 | Abb Research Ltd | Arrangement for detecting and evaluating current in conductor has core that contains sensor of current-induced magnetic field so as to act as screen for sensor against external magnetic fields |
| EP2116854B1 (en) | 2008-05-08 | 2011-01-12 | Areva T&D Messwandler GmbH | Active current sensor and current measuring device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1225756B (en) * | 1962-07-25 | 1966-09-29 | Siemens Ag | Capacitive voltage converter with negative resistance in the measuring circuit |
-
1978
- 1978-07-06 DE DE19782829949 patent/DE2829949C2/en not_active Expired
-
1979
- 1979-04-12 IN IN363/CAL/79A patent/IN150885B/en unknown
- 1979-06-06 BR BR7903609A patent/BR7903609A/en unknown
- 1979-07-05 CA CA331,217A patent/CA1130379A/en not_active Expired
- 1979-07-05 AT AT0468079A patent/AT367210B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE2829949A1 (en) | 1980-01-31 |
| DE2829949C2 (en) | 1982-11-11 |
| BR7903609A (en) | 1980-02-05 |
| AT367210B (en) | 1982-06-11 |
| IN150885B (en) | 1983-01-08 |
| ATA468079A (en) | 1981-10-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |