GB2100929A - Series linked capacitors - Google Patents
Series linked capacitors Download PDFInfo
- Publication number
- GB2100929A GB2100929A GB08118926A GB8118926A GB2100929A GB 2100929 A GB2100929 A GB 2100929A GB 08118926 A GB08118926 A GB 08118926A GB 8118926 A GB8118926 A GB 8118926A GB 2100929 A GB2100929 A GB 2100929A
- Authority
- GB
- United Kingdom
- Prior art keywords
- capacitor
- rod
- capacitors
- high voltage
- slot
- 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.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 title claims abstract description 65
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 5
- 239000000306 component Substances 0.000 claims description 20
- 229910052754 neon Inorganic materials 0.000 claims description 16
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 claims description 16
- 239000000919 ceramic Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 239000012212 insulator Substances 0.000 claims description 6
- 239000003989 dielectric material Substances 0.000 claims description 4
- 229910002113 barium titanate Inorganic materials 0.000 claims description 2
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical group [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 claims description 2
- 230000015556 catabolic process Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 239000003822 epoxy resin Substances 0.000 claims description 2
- 238000005286 illumination Methods 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 229910052573 porcelain Inorganic materials 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 claims description 2
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/38—Multiple capacitors, i.e. structural combinations of fixed capacitors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
Series linked capacitors for use in capacitative voltage dividers are formed from a rod 11 of high permittivity ceramic material having a slot or slots 12 through the rod transverse to the axis of the rod. The end surfaces of the rod and surface of the slot or slots are metalled to form capacitor electrodes. <IMAGE>
Description
SPECIFICATION
Series linked capacitors
This invention relates to electrical capacitor com
ponents, in particular for capacitors used in capacitative voltage dividers.
In some countries it is the practice to provide electrical distribution switchgear of 3-phase operating voltage which devices the function of which is to show that the switch is live by illumination of a neon lamp or lamps, usually one for each of the three phases. The same type of circuit can also be used to provide signals for automatic equipment to switch in alternative power supplies, or to detect inadvertent phase reversal on power system supplies which are to be connected together.
The method used for such live line detection is to feed a neon lamp or other indicating or sensing load from a capacitative voltage divider. Usually a high voltage capacitor element is contained within an insulator which serves also as one of the mechanical supports of a bus bar. The high voltage capacitor element is usually a high permittivity ceramic rod or block having metallised end faces to form electrodes, and the support insulation is made from an epoxy resin or other moulding material having good adhesion to the capacitor element surface. This adhesion enhances the resistance to surface breakdown of the capacitor. The low voltage capacitor is usually remote from the high voltage capacitor and in a seperate box in which the neon lamps or other loads are contained.
This invention provides a capacitor component comprising a body of high permittivity ceramic material with terminal surfaces thereof metallised to form electrodes, characterised in that the ceramic body also has at least one intermediate metallised surface to form, with the terminal surfaces, two or more capacitors in a single body.
The invention is illustrated by way of example with reference to Figs. 1 to 4 in which:
Fig. I shows a pairs of capacitors C1 and C2 linked in series between a high voltage line Land earth E. A load represented by a resistance R and noen light N is joined in parallel with C2. For capacitances C1 = 150 pF and C2 = 5850 pF and a high voltage line at 15 kV, V2 will be - 350 V.
Fig. 2 shows a sectional view of a known capacitor 1 equivalent to C1 in Fig. 1, mounted in a support insulator 2 and connected at one end through a metal rod 3 and screw-threaded terminal block 4 to a high voltage bus bar (not shown). The capacitor is connected at the other end, through a metal rod 5 and flexible lead 6 to one terminal of both a low voltage t-350 V) capacitor 7 (equivalent to C2 in Fig.
1) and a neon lamp 8. The other terminals of both the capacitor 7 and neon lamp 8 are connected to earth atE Fig. 2 also shows the two other capacitors 9 and neon lamps 10 required for 3-phase live-line indication.
Fig. 3 shows a capacitor component according to one embodiment of the present invention. This consists of a prismatic rod 11, in this case of hexagonal cross section, having a slot 12 cut transversely through the rod near one end. The end faces 13, 14 of the rod and the interior surface of the slot 12 are metallised to form the electrodes of two capacitors, respectively a high voltage capacitor between the slot 12 and end face 13, being equivalent to C, of Fig.
1, and a low voltage capacitor between the slot 12 and end face 14, being equivalent to C2 of Fig. 1. A suitable material for such a capacitor element is a barium titanate type, or other ceramic dielectric materials of permittivity value over 1000, an example of which is FARADEX 3000/1 ceramic manufactured and soldin the United Kingdom by Steatite and Porcelain Products Limited. FARADEX is their registered trade mark for a range of ceramic dielectric materials.
As one example a rod of this material of length = 65 mm and cross-sectional area 300 mm2 and having a slot of 4 mm width cut near one end within 1.5 mm of that end will provide a pair of capacitances approximately in accord with those stated for Fig. 1.
Fig. 4 shows a sectional view of a capacitor component 15 according to the present invention mounted in a moulded support insulator 2 and connected to a high voltage bus bar (not shown) through a metal rod 3 and screw-threaded terminal block 4. A metal rod 5 and flexible lead 6 connects to one terminal of a neon lamp 8 and earth at E. A force fitting clip or other connector (not shown) connects the slot electrode 12 in a terminal block 16 and flexible lead 17 to the other terminal of the neon 8. Fig. 4 also shows the two other means 10, required for 3-phase live-line indication.
Capacitor components made according to the invention have the major advantage that, being of the same material, the capacitors C1 and C2 have the same temperature, voltage, and frequency sensitivity of capacitance and so enable the ratio V1N2 to be maintained.
1. A capacitor component comprising a body of high permittivity ceramic material with terminal surfaces thereof metallised to form electrodes, characterised in that the ceramic body also has at least one intermediate metallised surface to form, with the terminal surfaces, two or more capacitors in a single body.
2. A capacitor component as claimed in claim 1 characterised in that an intermediate metallised surface is provided on a recess or opening in the body.
3. A capacitor component as claimed in claim 1 characterised in that the terminal surfaces are end surfaces of a ceramic rod and an intermediate surface is the surface of a slot through the rod and transverse to the longitudinal axis of the rod and located at such distance from the end surfaces respectively as to provide therewith given capacitance ratios.
4. A capacitative voltage divider comprising a capacitor component as claimed in claim 1, mounted in an insulating support, and with terminals provided for connection to a high voltage line, earth, and a sensing or indicating device.
5. A capacitor component as claimed in any of claims 1 to 3 with reference to the accompanying
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (5)
1. A capacitor component comprising a body of high permittivity ceramic material with terminal surfaces thereof metallised to form electrodes, characterised in that the ceramic body also has at least one intermediate metallised surface to form, with the terminal surfaces, two or more capacitors in a single body.
2. A capacitor component as claimed in claim 1 characterised in that an intermediate metallised surface is provided on a recess or opening in the body.
3. A capacitor component as claimed in claim 1 characterised in that the terminal surfaces are end surfaces of a ceramic rod and an intermediate surface is the surface of a slot through the rod and transverse to the longitudinal axis of the rod and located at such distance from the end surfaces respectively as to provide therewith given capacitance ratios.
4. A capacitative voltage divider comprising a capacitor component as claimed in claim 1, mounted in an insulating support, and with terminals provided for connection to a high voltage line, earth, and a sensing or indicating device.
5. A capacitor component as claimed in any of claims 1 to 3 with reference to the accompanying description and with particular reference to Fig. 3.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08118926A GB2100929B (en) | 1981-06-19 | 1981-06-19 | Series linked capacitors |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08118926A GB2100929B (en) | 1981-06-19 | 1981-06-19 | Series linked capacitors |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2100929A true GB2100929A (en) | 1983-01-06 |
GB2100929B GB2100929B (en) | 1985-01-03 |
Family
ID=10522643
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08118926A Expired GB2100929B (en) | 1981-06-19 | 1981-06-19 | Series linked capacitors |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2100929B (en) |
-
1981
- 1981-06-19 GB GB08118926A patent/GB2100929B/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB2100929B (en) | 1985-01-03 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |