CH257302A - Capacitive voltage divider for measuring high alternating and surge voltages. - Google Patents
Capacitive voltage divider for measuring high alternating and surge voltages.Info
- Publication number
- CH257302A CH257302A CH257302DA CH257302A CH 257302 A CH257302 A CH 257302A CH 257302D A CH257302D A CH 257302DA CH 257302 A CH257302 A CH 257302A
- Authority
- CH
- Switzerland
- Prior art keywords
- voltage divider
- voltage
- divider according
- voltmeter
- capacitor
- Prior art date
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
- G01R15/04—Voltage dividers
- G01R15/06—Voltage dividers having reactive components, e.g. capacitive transformer
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
Description
Kapazitiver Spannungsteiler zur Messung hoher Wechsel und Stof@spannungen.
I) Hauptpatent beschreibt einen Lapa.- zitiven Spannungsteiler, welcher es erm¯g licht. aus einer Hochspannung einen festen Hrnchteil hera. uszugreifen, um ihn der Mes- sung zugÏnglich zu machen. Gegenstand des vorliegenden Zusatzpatentes bildet eine weitere Ausbildung des kapazitiven Spannungsteiler. nach dem Hauptpa, tent, die dadurch gekennzeichnet ist, da¯ mindestens ein Kondensator vorgesehen ist, der über ein elek @risches Ventil auf den Scheitelwert der zur Messung benutzten Teilspannung aufgeladen und dessen Ladespannung mit einem Voltmeter gemessen wird.
Ein erstes Ausf hrungsbeispiel soll an Hand der Fig. 1 beschrieben werden. Von der Hochspannung U wird kapazitiv ein Brueh@eil @ am Kondensator C2 herausgegrif- fen. An diesen Kondensator C2 wird nun ber ein elektrisches Ventil G ein kleinerer Kondensator Cg angeschlossen, der sich bei rich tiger r Wahl der PolaritÏt der Spannung @ auf deren. Seheitelwert u, a. uflädt. Diese Spannung wird vom Voltmeter @ angezeigt.
WÏhrenddem der Scheitelwert der Spannung at am Eondensator C von nur sehr kurzer Dauer sein kann, sinkt bei entsprechend hohem Gleichstromwiderstand des Voltmeters und des Kondensators Cg die Spannung s nur langsam ab. In dieser Zeitstreckung der Me¯spannung beruht der Vorteil der Sehal tung für die Messung. Die Einrichtung ist deshalb speziell geeignet f r die Anzeige sehr l. nrzdaalernder Spannungsimpulse U.
In diesem Fall muss darauf geachtet werden, da. ss die Induktivität des Kreises Cz-G*-Cg sehr klein bleibt, damit der ber das Ventil G in den Kondensator Cg fliessende Lade- strom i = Cg. du/dt rasch entstehen kann.
Ferner mu¯ das Ventil G kurzzeitig diesen Ladestrom i bei. mögliehst kleinem Span- nungsabfall führen können.
Es werden deshalb mit Vorteil Hoch Vakuumröhren mit grosser Emission und kleinem innerem Wiclerstand oder dann mit einem rasch entionisierenden Gas, z. B.
Wasserdampf, gefüllte Elektronenrohren als elektrise. Ventile C benutzt.
Für die Messung von Spannungen beider Polaritäten muss entweder der AnschluB des einzigen Ventils G gewechselt werden, oder dann sind nach Fig. 2 zwei umgekehrt ge richtete Ventile mit je einem Kondensator Cg zu benutzen.
Als Voltmeter f werden mit Vorteil statische AToltmeter oder Braunsehc Röhren bzw, Kathodenstrahl-Oszillographen KO mϯiger Schreibgeschwindigkeit benutzt. Durch einen parallelen hochohmigen Widerstand Re oder eine Kurzschlnsstaste T kann die Spannung Ms innert einer gewünschten Zeit wieder an nulliert xverden.
Capacitive voltage divider for measuring high alternating and material voltages.
I) The main patent describes a Lapa-citiv voltage divider, which makes it possible. out of a high voltage a permanent part. to make it accessible for measurement. The subject of the present additional patent forms a further development of the capacitive voltage divider. according to the main patent, which is characterized in that at least one capacitor is provided, which is charged to the peak value of the partial voltage used for measurement via an electrical valve and whose charging voltage is measured with a voltmeter.
A first exemplary embodiment will be described with reference to FIG. 1. A bridge @ eil @ at the capacitor C2 is capacitively picked out from the high voltage U. A smaller capacitor Cg is now connected to this capacitor C2 via an electrical valve G, which, if the polarity of the voltage @ is correctly selected, changes to its. Seheitelwert u, a. charges. This voltage is displayed by the voltmeter @.
While the peak value of the voltage at across the capacitor C can only be of a very short duration, the voltage s drops only slowly if the DC resistance of the voltmeter and the capacitor Cg is correspondingly high. The advantage of the posture for the measurement is based on this time extension of the voltage. The device is therefore particularly suitable for displaying very l. nrzdaalernder voltage pulses U.
In this case, care must be taken because. ss the inductance of the circuit Cz-G * -Cg remains very small so that the charging current i = Cg flowing through the valve G into the capacitor Cg. du / dt can arise quickly.
Furthermore, the valve G must briefly have this charging current i. as small a voltage drop as possible.
It is therefore advantageous to use high vacuum tubes with a large emission and a small inner winding position or then with a rapidly deionizing gas, e.g. B.
Water vapor, filled electron tubes as electricity. Valves C used.
For the measurement of voltages of both polarities, either the connection of the single valve G must be changed, or two reversed valves, each with a capacitor Cg, are to be used as shown in FIG.
Static A-voltmeters or Braunsehc tubes or cathode ray oscillographs KO with moderate writing speed are advantageously used as voltmeters. The voltage Ms can be zeroed again within a desired time by a parallel high-resistance Re or a short-circuit key T.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH257302T | 1946-04-29 | ||
CH251166T | 1947-04-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH257302A true CH257302A (en) | 1948-09-30 |
Family
ID=25729517
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH257302D CH257302A (en) | 1946-04-29 | 1946-04-29 | Capacitive voltage divider for measuring high alternating and surge voltages. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH257302A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19923211C2 (en) * | 1998-07-23 | 2001-05-10 | Karlsruhe Forschzent | Capacitive voltage divider for measuring high voltage pulses with millisecond pulse duration |
WO2008148727A1 (en) * | 2007-06-07 | 2008-12-11 | Abb Technology Ag | Voltage measurements of electrically conducting elements in systems for controlling electrical processes |
-
1946
- 1946-04-29 CH CH257302D patent/CH257302A/en unknown
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19923211C2 (en) * | 1998-07-23 | 2001-05-10 | Karlsruhe Forschzent | Capacitive voltage divider for measuring high voltage pulses with millisecond pulse duration |
WO2008148727A1 (en) * | 2007-06-07 | 2008-12-11 | Abb Technology Ag | Voltage measurements of electrically conducting elements in systems for controlling electrical processes |
US8305095B2 (en) | 2007-06-07 | 2012-11-06 | Abb Technology Ag | Voltage measurements of electrically conducting elements in systems for controlling electrical processes |
CN101523678B (en) * | 2007-06-07 | 2012-11-07 | Abb技术有限公司 | Voltage measurements of electrically conducting elements in systems for controlling electrical processes |
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