JPH0612572Y2 - Voltage detector - Google Patents
Voltage detectorInfo
- Publication number
- JPH0612572Y2 JPH0612572Y2 JP2207787U JP2207787U JPH0612572Y2 JP H0612572 Y2 JPH0612572 Y2 JP H0612572Y2 JP 2207787 U JP2207787 U JP 2207787U JP 2207787 U JP2207787 U JP 2207787U JP H0612572 Y2 JPH0612572 Y2 JP H0612572Y2
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- voltage
- capacitors
- insulator
- voltage side
- 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 - Lifetime
Links
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Transformers For Measuring Instruments (AREA)
- Insulators (AREA)
Description
【考案の詳細な説明】 〔考案の目的〕 （産業上の利用分野） 本考案は検電がいしに関する。[Detailed Description of the Invention] [Object of the Invention] (Field of Industrial Application) The present invention relates to an electric insulator.
（従来の技術） スイッチギア等の主回路母線の電圧分圧用にコンデンサ
形計器用変圧器がある。このコンデンサ形計器用変圧器
の等価回路を示す第４図において、主回路母線電圧V1を
コンデンサC1,C2で分圧して制御回路電圧V2を得るが、
このコンデンサC1は主回路母線電圧V1の殆んどを分担す
るため、主回路の高電圧化でコンデンサC1も大形にな
る。(Prior Art) There is a capacitor type voltage transformer for voltage division of a main circuit bus such as a switchgear. In FIG. 4 showing an equivalent circuit of this capacitor type transformer for a transformer, the control circuit voltage V 2 is obtained by dividing the main circuit bus voltage V 1 by the capacitors C 1 and C 2 .
Since this capacitor C 1 shares most of the main circuit bus voltage V 1 , the high voltage of the main circuit also makes the capacitor C 1 large.
このコンデンサC1として、例えばセラミック製コンデン
サをエポキシ樹脂等の絶縁材料で１体注形した支持がい
しがある。つまり、支持がいしを形成する絶縁材料の内
部にコンデンサを埋込み、主回路母線の支持と検電機能
をかねた検電がいしである。この検電がいしを第５図に
示し、通常の支持がいしの形状でエポキシ樹脂等の絶縁
層１の内部に例えばセラミック製コンデンサ２を埋込
み、両端に上部電極３と下部電極４があって電極的に接
続されている。ここで検電がいしは高電圧になると、同
一容量のコンデンサを直列接続するので、高電圧化にな
ればなる程コンデンサ２の数が増える。第５図はコンデ
ンサ２を第５個直列接続した例で、各コンデンサはリー
ド線５で接続され、コンデンサ間２−２や、コンデンサ
と上，下部電極間２−３，２−４は、ほぼ均等間隔に配
置されている。また、コンデンサ２と共に絶縁層１内に
埋込まれる上下電極３，４は、ほぼ同じ形状・大きさの
ものが対向して配置され、上部電極３は図示しない主回
路母線に、また、下部電極４は図示していないコンデン
サC2に接続されている。尚、検電がいしを固定する場合
には下部電極４を図示していない。フレーム等にボルト
で支持固定するが、検電がいしの最下部のリード線５は
下部電極４と絶縁され、例えば検電がいしの下部付近に
最下部のリード線５を絶縁層１から露出させ、コンデン
サC2と接続する。As the capacitor C 1 , for example, there is a support insulator in which one ceramic capacitor is cast with an insulating material such as epoxy resin. In other words, it is a voltage-detecting insulator in which a capacitor is embedded inside an insulating material forming a supporting insulator and which also serves as a main-circuit bus supporting and detecting function. This electric detection insulator is shown in FIG. 5, in which a ceramic capacitor 2 is embedded in an insulating layer 1 made of epoxy resin or the like in the shape of a normal support insulator, and an upper electrode 3 and a lower electrode 4 are provided at both ends of the insulator. It is connected to the. Here, when the voltage of the detection insulator becomes high, capacitors of the same capacity are connected in series, so the number of capacitors 2 increases as the voltage becomes higher. FIG. 5 shows an example in which a fifth capacitor 2 is connected in series, and each capacitor is connected by a lead wire 5, and a space between the capacitors 2-2 and a space between the capacitors and the upper and lower electrodes 2-3 and 2-4 are almost the same. They are evenly spaced. The upper and lower electrodes 3 and 4 to be embedded in the insulating layer 1 together with the capacitor 2 have substantially the same shape and size so as to face each other, and the upper electrode 3 is provided on a main circuit bus bar (not shown) and the lower electrode. 4 is connected to a capacitor C 2 not shown. The lower electrode 4 is not shown in the figure when the electromotive insulator is fixed. It is supported and fixed to a frame or the like with bolts, but the lowermost lead wire 5 of the electric detection insulator is insulated from the lower electrode 4. For example, the lowermost lead wire 5 is exposed from the insulating layer 1 near the lower portion of the electric detection insulator, Connect with capacitor C 2 .
（考案が解決しようとする問題点） この構成の検電がいしにおいて、５個直列接続したコン
デンサ２の１個当りの分担電圧をＡＣ電圧で求めた特性
例を第６図に示す。同図の横軸は接地側から高電圧側に
配置されたコンデンサ２の番号、また縦軸は分担電圧の
平均値に対する各コンデンサ２の分担電圧の割合を示
す。第６図において、接地側のコンデンサ２の分担率は
約95％であるのに対し、高電圧側特に最上部のコンデン
サ２は約110％である。（これは各コンデンサ２が受け
る対地静電容量の違いや電界強度の違いが考えられ
る。）すると、高電圧側のコンデンサ２は部分放電が発
生しやすい。つまり、コンデンサ２を複数個直列接続す
ると、接続した数だけの絶縁性能が期待できず、ある割
合だけがあるため、余分に接続しなければならない。し
かし、個数が増える程、高電圧側のコンデンサ２の分担
率は増える。(Problems to be Solved by the Invention) FIG. 6 shows a characteristic example in which the shared voltage for each of the five capacitors 2 connected in series is obtained by the AC voltage in the detector insulator of this configuration. In the figure, the horizontal axis represents the number of the capacitor 2 arranged from the ground side to the high voltage side, and the vertical axis represents the ratio of the shared voltage of each capacitor 2 to the average value of the shared voltage. In FIG. 6, the share of the capacitor 2 on the ground side is about 95%, while the share of the capacitor 2 on the high voltage side, especially the uppermost capacitor 2, is about 110%. (This may be due to the difference in the electrostatic capacitance received by each capacitor 2 or the difference in the electric field strength.) Then, partial discharge easily occurs in the capacitor 2 on the high voltage side. In other words, if a plurality of capacitors 2 are connected in series, the insulation performance of the number of the connected capacitors cannot be expected, and since there is a certain ratio, it is necessary to additionally connect them. However, as the number of capacitors increases, the share of the capacitors 2 on the high voltage side increases.
また、サージ電圧等の過電圧が印加された場合には高電
圧側の方が絶縁劣化しやすい。Further, when an overvoltage such as a surge voltage is applied, insulation deterioration is more likely to occur on the high voltage side.
（考案の目的） 本考案は、複数個直列接続されたコンデンサの分担率を
均等化して、耐電圧特性を上げた検電がいしを得ること
を目的とする。(Object of the Invention) An object of the present invention is to obtain a voltage detecting insulator having an improved withstand voltage characteristic by equalizing the sharing ratio of a plurality of capacitors connected in series.
（問題点を解決するための手段） 高電圧側コンデンサと対向する上部電極６の面積を絶縁
層１内で広げて、高電圧側コンデンサが受ける浮遊静電
容量C0を増やした。また高圧側コンデンサと上部電極２
の絶縁距離を短くして静電容量を増やした。(Means for Solving Problems) The area of the upper electrode 6 facing the high-voltage side capacitor is expanded in the insulating layer 1 to increase the floating electrostatic capacitance C 0 received by the high-voltage side capacitor. Also, the high voltage side capacitor and the upper electrode 2
The insulation distance was shortened to increase the capacitance.
（作用） 接地側等のコンデンサの静電容量が殆んど変化せず、高
電圧側コンデンサの静電容量が見かけ上増えると、高電
圧側コンデンサの分担電圧が下がる。従って、複数個直
列接続されたコンデンサのうち、最も高い分担率を示す
高電圧側コンデンサの分担電圧が下がるので、各コンデ
ンサの分担電圧が均等になる。これでコンデンサ数の増
加を防ぐことができ、耐電圧特性も上げることができ
る。(Function) When the electrostatic capacitance of the capacitor on the ground side or the like hardly changes and the electrostatic capacitance of the high voltage side capacitor apparently increases, the shared voltage of the high voltage side capacitor decreases. Therefore, among the capacitors connected in series, the sharing voltage of the high-voltage side capacitor showing the highest sharing ratio is lowered, and the sharing voltage of each capacitor is equalized. This can prevent an increase in the number of capacitors and improve the withstand voltage characteristic.
（実施例） 本考案による実施例を第１図に示し、絶縁層１、コンデ
ンサ２、下部電極４およびリード線５は従来方法と同様
であるが、上部電極６は、高電圧側コンデンサ２と対向
する面積を広げるために絶縁層１内で凸凹を設けてあ
る。つまり、上部電極６の外周部に凸部を設け、コンデ
ンサ２等と一体注形した構成である。尚、上部電極６は
リード線５とコンデンサ２を介して下部電極４に接続さ
れている。(Embodiment) An embodiment according to the present invention is shown in FIG. 1, in which the insulating layer 1, the capacitor 2, the lower electrode 4 and the lead wire 5 are the same as those in the conventional method, but the upper electrode 6 is the high voltage side capacitor 2. Unevenness is provided in the insulating layer 1 in order to widen the facing area. That is, the upper electrode 6 is provided with a convex portion on the outer peripheral portion thereof and is integrally cast with the capacitor 2 and the like. The upper electrode 6 is connected to the lower electrode 4 via the lead wire 5 and the capacitor 2.
上部電極６の面積が増えると、高電圧側コンデンサ２が
受ける浮遊静電容量C0が大きくなり、静電容量が見かけ
上増える。When the area of the upper electrode 6 increases, the floating electrostatic capacitance C 0 received by the high-voltage side capacitor 2 increases, and the electrostatic capacitance apparently increases.
例えば、上部電極６とコンデンサ２間距離を10mmとし、
比誘電率ε＝5.0のエポキシ樹脂を注形すると、コンデ
ンサ２の静電容量は従来方法で５PF増え、接地側等の他
のコンデンサ２も注形で同様に増える。しかし、本考案
のように上部電極６の面積を増やすと、約２〜３倍にな
る。ここで、上部電極６の凸部はコンデンサ２の電極部
７まで伸ばしても、上部電極６とコンデンサ電極部７は
リード線５で同電位のため絶縁は問題なく、高電圧側コ
ンデンサ２の静電容量を見かけ上更に増やすことができ
る。但し、これらの電極６，７を接触状態にすると、エ
ポキシ樹脂の注形時に気泡等ができやすく、下部電極４
への部分放電につながる。For example, the distance between the upper electrode 6 and the capacitor 2 is 10 mm,
If epoxy resin with a relative permittivity ε = 5.0 is cast, the capacitance of the capacitor 2 will increase by 5PF by the conventional method, and other capacitors 2 on the ground side will also increase by casting. However, when the area of the upper electrode 6 is increased as in the present invention, it becomes about 2-3 times. Here, even if the convex portion of the upper electrode 6 extends to the electrode portion 7 of the capacitor 2, since the upper electrode 6 and the capacitor electrode portion 7 have the same potential at the lead wire 5, there is no problem in insulation, and the static electricity of the high-voltage side capacitor 2 is eliminated. The capacitance can be apparently increased. However, if these electrodes 6 and 7 are brought into contact with each other, bubbles or the like are likely to be generated when the epoxy resin is cast, and the lower electrode 4
Leads to partial discharge to.
高電圧側コンデンサ２の静電容量が見かけ上増えると、
増えた割合だけ分担電圧が下がる。従って、最も高い分
担電圧のコンデンサ２の分担率を抑えられるので、複数
個直列接続した各コンデンサ２の分担率を均等化でき
る。これにより、直列接続コンデンサ数の増加を防げ、
直列接続全体での耐電圧特性が向上する。If the capacitance of the high-voltage side capacitor 2 apparently increases,
The shared voltage is reduced by the increased rate. Therefore, since the sharing rate of the capacitor 2 having the highest sharing voltage can be suppressed, the sharing rates of the capacitors 2 connected in series can be equalized. This prevents an increase in the number of capacitors connected in series,
The withstand voltage characteristics of the entire series connection are improved.
（他の実施例） 高電圧側コンデンサの静電容量を見かけ上増やすには、
第２図に示す如く、上部電極８と高電極８と高電圧側コ
ンデンサ２の絶縁距離をコンデンサ間２−２やコンデン
サ２と下部電極４間より短くする方法がある。更に、第
３図に示す如く、上部電極９の外径寸法をコンデンサ２
や下部電極10より大きくし、また、下部電極10の外径寸
法を最も小さくする方法がある。このように静電容量が
見かけ上増やすと、分担電圧が低下し上述と同様の効果
がある。(Other Examples) To apparently increase the capacitance of the high-voltage side capacitor,
As shown in FIG. 2, there is a method of making the insulation distance between the upper electrode 8, the high electrode 8 and the high voltage side capacitor 2 shorter than between the capacitors 2-2 and between the capacitor 2 and the lower electrode 4. Further, as shown in FIG. 3, the outer diameter of the upper electrode 9 is set to the capacitor 2
Alternatively, there is a method of making it larger than the lower electrode 10 and minimizing the outer diameter dimension of the lower electrode 10. When the capacitance apparently increases in this way, the shared voltage decreases and the same effect as described above is obtained.
本考案は複数個直列接続されたコンデンサのうち、分担
電圧の最も高い高電圧側コンデンサの静電容量を上部電
極の面積拡大や絶縁距離の縮小で見かけ上の静電容量を
増やし、分担電圧を抑え、各コンデンサの分担電圧を均
しくして高電圧化に伴う直列接続コンデンサ数の増加を
抑え、耐電圧特性を上げた検電がいしを得ることができ
る。In the present invention, among the capacitors connected in series, the capacitance of the high-voltage side capacitor with the highest shared voltage is increased to increase the apparent capacitance by increasing the area of the upper electrode and the insulation distance to reduce the shared voltage. It is possible to suppress the increase in the number of capacitors connected in series due to the increase in the voltage by making the shared voltage of each capacitor even, and to obtain a voltage detecting insulator with improved withstand voltage characteristics.
第１図は本考案の検電がいしの一実施例を示す半断面
図、第２図第３図は本考案の検電がいしの他の実施例を
示す半断面図、第４図は検電がいしの静電容量性分圧器
としての等価回路図、第５図は従来の検電がいしの半断
面図、第６図は従来のコンデンサ内蔵検電がいしの各コ
ンデンサの分担率を求めた特性図である。 １……絶縁層、２……コンデンサ 3,6,8,9……上部電極、4,10……下部電極 ５……リード線、７……コンデンサ電極部FIG. 1 is a half sectional view showing an embodiment of the voltage detecting insulator of the present invention, FIG. 2 is a half sectional view showing another embodiment of the voltage detecting insulator of the present invention, and FIG. An equivalent circuit diagram of an insulator as a capacitive voltage divider, FIG. 5 is a half sectional view of a conventional detection insulator, and FIG. 6 is a characteristic diagram in which the share of each capacitor of the conventional detection insulator with built-in capacitor is obtained. Is. 1 ... Insulating layer, 2 ... Capacitor 3,6,8,9 ... Upper electrode, 4,10 ... Lower electrode 5 ... Lead wire, 7 ... Capacitor electrode part
Claims (2)
シ樹脂等の絶縁材料で一体注形した検電がいしにおい
て、前記コンデンサに接続する高電圧側の電極の面積を
広くし、二次端子と接続する下部電極の面積を狭くした
ことを特徴とする検電がいし。1. In a voltage detection insulator, wherein a plurality of capacitors connected in series are integrally cast with an insulating material such as epoxy resin, the area of the high-voltage side electrode connected to the capacitor is widened and connected to the secondary terminal. An electric insulator which is characterized in that the area of the lower electrode is reduced.
離をコンデンサ間やコンデンサと下部電極間により短く
したことを特徴とする実用新案登録請求の範囲第(1)項
記載の検電がいし。2. An electric detection insulator according to claim (1), characterized in that the insulation distance between the high-voltage side capacitor and the upper electrode is made shorter between the capacitors and between the capacitor and the lower electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2207787U JPH0612572Y2 (en) | 1987-02-19 | 1987-02-19 | Voltage detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2207787U JPH0612572Y2 (en) | 1987-02-19 | 1987-02-19 | Voltage detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63129921U JPS63129921U (en) | 1988-08-25 |
| JPH0612572Y2 true JPH0612572Y2 (en) | 1994-03-30 |
Family
ID=30819116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2207787U Expired - Lifetime JPH0612572Y2 (en) | 1987-02-19 | 1987-02-19 | Voltage detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0612572Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002184274A (en) * | 2000-12-18 | 2002-06-28 | Toshiba Corp | Vacuum circuit breaker |
| JP6762327B2 (en) | 2018-01-10 | 2020-09-30 | 株式会社明電舎 | Vacuum condenser type voltage transformer |
-
1987
- 1987-02-19 JP JP2207787U patent/JPH0612572Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63129921U (en) | 1988-08-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1030326A3 (en) | Solid electrolytic capacitor, and method of manufacturing the same | |
| WO2012056304A2 (en) | Sensor assembly, trip unit including the same, and method of manufacturing a sensor assembly | |
| JPH0612572Y2 (en) | Voltage detector | |
| JPS6311016A (en) | Gas insulated switchgear | |
| US3317659A (en) | High voltage insulator with internal corona shield | |
| US5373279A (en) | Arrester for gas insulated switchgear device | |
| JPS6023569B2 (en) | gas insulated electrical equipment | |
| JPS63304534A (en) | Voltage detecting insulator | |
| JP2537898B2 (en) | Voltage divider | |
| JP4033999B2 (en) | Capacitance sensor for crime prevention | |
| JPS5936899Y2 (en) | coupling capacitor | |
| JPH06163213A (en) | Lightning arrester for thyristor valve and thyristor valve for DC power transmission using the same | |
| JPS5929305Y2 (en) | overhead power distribution line | |
| JPS5927072Y2 (en) | high voltage semiconductor rectifier | |
| JP3421168B2 (en) | Bushing | |
| US3829629A (en) | Electrical insulator having a special external surface configuration for improved performance in contaminated atmospheres | |
| US3304474A (en) | Power capacitor device having voltage stress grading plane | |
| JPH019231Y2 (en) | ||
| JP3401960B2 (en) | Conductor drawing device | |
| JPS6313328B2 (en) | ||
| JPS6037778Y2 (en) | butsing | |
| JPH084625Y2 (en) | Support insulator zero-phase voltage detector | |
| JP2584477Y2 (en) | Three-phase Y-coupled dry high-voltage advance capacitor | |
| JPH071772Y2 (en) | Stationary induction | |
| JPH0310632Y2 (en) |