JPS583520A - Grounding system for power cable sheath - Google Patents
Grounding system for power cable sheathInfo
- Publication number
- JPS583520A JPS583520A JP9933981A JP9933981A JPS583520A JP S583520 A JPS583520 A JP S583520A JP 9933981 A JP9933981 A JP 9933981A JP 9933981 A JP9933981 A JP 9933981A JP S583520 A JPS583520 A JP S583520A
- Authority
- JP
- Japan
- Prior art keywords
- power cable
- cable sheath
- sheath
- grounding
- grounding system
- 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
Landscapes
- Cable Accessories (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
本発明は高周波サージに対して有効な電カケープルシー
スの接地方式に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grounding system for a power cable sheath that is effective against high frequency surges.
従来、第１図に示すように電カケープル（１）の一端に
導体電流測定用の変流器４を配置することがあるが、こ
の場合接地線２は変流器（ＣＴ）４の中を通して接地す
る必要がある為、長くなることはさけられない。しかし
、この電カケープル１が無課電の状態でｓ ／ ｓの遮
断器５を投入すると非常に急俊なサージ電圧がケーブル
シースに誘起されることがわかった。例えば５００ＫＶ
系統の１例では数メガサイクル、１８０ＫＶのサージ変
圧やケーブルシースに誘起された観測例がある。Conventionally, as shown in Fig. 1, a current transformer 4 for measuring conductor current is sometimes placed at one end of a power cable (1), but in this case, the grounding wire 2 is passed through the current transformer (CT) 4. Since it needs to be grounded, it cannot be avoided that it is long. However, it has been found that when the s/s circuit breaker 5 is turned on while the power cable 1 is in a non-energized state, a very rapid surge voltage is induced in the cable sheath. For example 500KV
In one example of a power system, several megacycles and 180KV surges have been observed to be induced in transformers and cable sheaths.
一方ケーブルのシース誘起電圧は防食層の性能から３０
ＫＶ程度以下に抑制する必要があるが、接地線が長いと
自己インダクタンスが大きくなり、この様な高周波サー
ジ変圧に対しては接地の役目を果さなくなる。On the other hand, the cable sheath induced voltage is 30% due to the performance of the anti-corrosion layer.
It is necessary to suppress the grounding voltage to about KV or less, but if the grounding wire is long, the self-inductance becomes large, and it no longer plays the role of grounding against such high frequency surge transformation.
第１図において、３はアレスタ（避雷器）であり、６は
変圧器直結終端箱、７は終端箱である。In FIG. 1, 3 is an arrester, 6 is a termination box directly connected to a transformer, and 7 is a termination box.
また、これに対して図示しないが、変圧器直結終端箱６
の側を接地し、遮断器５側にシース保護地絡事故時のＡ
（３誘起電圧でシース保護用アレスタが破損した場合に
は、シース電流がこの部分を通過する可能性があるため
変流器４で正しい導体電流が測定できなくなる恐れがあ
り推奨できない。In addition, although not shown, the transformer direct connection termination box 6
A on the breaker 5 side in the event of a sheath protection ground fault.
(3) If the sheath protection arrester is damaged by the induced voltage, the sheath current may pass through this part, so the current transformer 4 may not be able to measure the conductor current correctly, so this is not recommended.
本発明は斯かる状況に鑑み、高周波サージに対して有効
な電カケープルシースの接地方式を提供することを目的
とする。SUMMARY OF THE INVENTION In view of this situation, it is an object of the present invention to provide a method for grounding a power cable sheath that is effective against high-frequency surges.
本発明の構成を、一実施例を示す第２図を参照して具体
的に説明する。The configuration of the present invention will be specifically explained with reference to FIG. 2 showing one embodiment.
第２図に示すように、電カケープル１の一端すなわち遮
断器５側の終端箱７の支持鉄構直下にて接地線２を分岐
し、一方は従来同様に変流器４内を通して接地し、他方
は周波数特性のきわめて良いギャップレスアレスタ３１
に直結するものである。As shown in FIG. 2, the grounding wire 2 is branched at one end of the power cable 1, that is, directly under the support steel structure of the termination box 7 on the side of the circuit breaker 5, and one end is grounded through the current transformer 4 as in the conventional case. The other is a gapless arrester 31 with extremely good frequency characteristics.
This is directly connected to
また、電カケープル１の他端すなわち変圧器直結終端箱
６側においては従来同様にシース保護用のアレスタ３２
を設置する。In addition, at the other end of the power cable 1, that is, on the side of the transformer direct connection termination box 6, an arrester 32 for sheath protection is installed as in the conventional case.
Set up.
一般に、終端箱支持架台は鉄鋼であるが、表面積が大き
いので高周波異常電圧に対しては有効な接地となシ得る
。Generally, the terminal box support frame is made of steel, but since it has a large surface area, it cannot be effectively grounded against abnormal high-frequency voltages.
以上説明したような本発明の電カケープルシースの接地
方式であれば次のような顕著な効果を奏する。The grounding type of the power cable sheath of the present invention as explained above provides the following remarkable effects.
（１） 高周波異常電圧に対してはアレスタが作動し
、（２） Ｊｉ用周波数に対しては、変流器中を通し
た接地線が有効に働き、シース誘起電圧を抑制するとと
もに、１線地絡時のアレスタ破損にも対応する。(1) For abnormal high-frequency voltages, the arrester operates, and (2) for Ji frequencies, the grounding wire running through the current transformer works effectively, suppressing the sheath induced voltage, and It also protects against arrester damage in the event of a ground fault.
第１図は従来の接地方式を示す説明図であり、第２図は
本発明の一実施例を示す説明図である。
１：電カケープル、
２：接地線、
３．３１，３２：アレスタ、
４：変流器、
５：遮蔽器。FIG. 1 is an explanatory diagram showing a conventional grounding system, and FIG. 2 is an explanatory diagram showing an embodiment of the present invention. 1: Power cable, 2: Grounding wire, 3.31, 32: Arrester, 4: Current transformer, 5: Shield.
Claims (1)
いて、遮断器５側のケーブル終端箱７と変流器４との間
で接地線２が被覆設けられており、一方の接地線２は変
流器４中を通って接地されており、他方はアレスタに直
結されていることを特徴とする電カケープルシース接地
方式。In the cable sheath grounding type with one end grounded and one end insulated, the ground wire 2 is covered between the cable termination box 7 on the circuit breaker 5 side and the current transformer 4, and one ground wire 2 is connected to the current transformer. A power cape sheath grounding type characterized in that the other end is connected directly to the arrester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9933981A JPS6053525B2 (en) | 1981-06-25 | 1981-06-25 | Grounding method for power cable sheath |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9933981A JPS6053525B2 (en) | 1981-06-25 | 1981-06-25 | Grounding method for power cable sheath |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS583520A true JPS583520A (en) | 1983-01-10 |
| JPS6053525B2 JPS6053525B2 (en) | 1985-11-26 |
Family
ID=14244862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9933981A Expired JPS6053525B2 (en) | 1981-06-25 | 1981-06-25 | Grounding method for power cable sheath |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6053525B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010233278A (en) * | 2009-03-25 | 2010-10-14 | Railway Technical Res Inst | Device and method for grounding of power cable cover layer |
-
1981
- 1981-06-25 JP JP9933981A patent/JPS6053525B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010233278A (en) * | 2009-03-25 | 2010-10-14 | Railway Technical Res Inst | Device and method for grounding of power cable cover layer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6053525B2 (en) | 1985-11-26 |
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