JPS646611B2 - - Google Patents
Info
- Publication number
- JPS646611B2 JPS646611B2 JP54050374A JP5037479A JPS646611B2 JP S646611 B2 JPS646611 B2 JP S646611B2 JP 54050374 A JP54050374 A JP 54050374A JP 5037479 A JP5037479 A JP 5037479A JP S646611 B2 JPS646611 B2 JP S646611B2
- Authority
- JP
- Japan
- Prior art keywords
- converter
- relay
- overvoltage
- timer
- protection
- 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
- 230000001681 protective effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Landscapes
- Rectifiers (AREA)
- Protection Of Static Devices (AREA)
- Direct Current Feeding And Distribution (AREA)
Description
【発明の詳細な説明】
本発明は交直変換器を有する直流送電システム
の保護装置にかかり、特に、逆変換装置に故障に
よる瞬時ゲートブロツク、あるいは、送電線の断
線等に起因する過電圧現象の保護方式に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a protection device for a DC power transmission system having an AC/DC converter, and in particular protects against instantaneous gate block due to failure of an inverter or overvoltage phenomenon caused by disconnection of a power transmission line, etc. Regarding the method.
直流送電システムは第１図に示すように、交流
系統１、変換用変圧器２、サイリスタバルブ等に
より構成される交を変換器３、直流リアクトル
４、直流送電線５にて構成される。 As shown in FIG. 1, the DC power transmission system is composed of an AC system 1, a conversion transformer 2, an AC converter 3 including a thyristor valve, a DC reactor 4, and a DC transmission line 5.
このような直流送電システムにおいて、送電距
離が長くなると対地の浮遊容量６が大きくなり、
第２図に示すように逆変換器側が何等かの理由に
よりゲートブロツク、あるいは、直流回路断線と
なると、順変換器側より直流回路へ流入する直流
電流が対地浮遊容量６に充電され、直流送電線に
過電圧が発生する。この時の現象を第３図に示す
ように、直流電流Idは一度増加の後減少し、直流
電圧Vdは一度減少したのち増加して、過電圧と
なる。 In such a DC power transmission system, as the power transmission distance increases, the stray capacitance 6 to the ground increases.
As shown in Figure 2, if the reverse converter side becomes gate-blocked or the DC circuit is disconnected for some reason, the DC current flowing into the DC circuit from the forward converter side is charged to the ground stray capacitance 6, and the DC transmission is interrupted. Overvoltage occurs on the wire. As shown in FIG. 3, the phenomenon at this time is that the DC current I d increases once and then decreases, and the DC voltage V d decreases once and then increases, resulting in an overvoltage.
従来このような現象に対しては、第４図に示す
如く、直流電流が一定レベル以下になつたことに
より動作する不足電流継電器９と直流電圧がある
一定値以上になつたことにより動作する過電圧継
電器１０を設置し、いずれかの出力が所定時間以
上出たこことをタイマー１１で確認することによ
り変換器停止指令を出し、保護操作を行つてき
た。 Conventionally, for such a phenomenon, as shown in Fig. 4, there is an undercurrent relay 9 that operates when the DC current falls below a certain level, and an overvoltage relay that operates when the DC voltage exceeds a certain level. A relay 10 was installed, and a timer 11 was used to confirm that any output was present for a predetermined period of time, thereby issuing a converter stop command and performing protective operations.
しかしこのような方式では、通常の過渡現象で
発生する電流の断続、あるいは直流電圧制御系の
オーバーシユートにより発生する過電圧に対して
も応動するため、50〜100msのタイマー１１を入
れて不要動作を防止している。 However, in this type of system, a timer 11 of 50 to 100 ms is installed to prevent unnecessary operations in order to respond to overvoltages caused by interruptions in current that occur due to normal transient phenomena or overshoots in the DC voltage control system. is prevented.
そのため、このタイマー１１の動作時間だけ、
保護操作に入る時間が遅れ、機器破損の可能性が
大である。 Therefore, only the operating time of this timer 11 is
The time required to initiate protective operations is delayed, and there is a high possibility of equipment damage.
本発明は、できるだけ早く保護動作可能な保護
方式を提供することを目的とする。 An object of the present invention is to provide a protection method that can perform protection operations as quickly as possible.
不足電流継電器と過電圧継電器は通常の動作で
は同時に働くことはない。したがつてこの２つの
継電器の一致条件により変換器を停止操作すれ
ば、上記タイマー１１が不要となり高速保護が可
能であり機器破損の可能性を大巾に減少できる。 Undercurrent relays and overvoltage relays do not operate simultaneously during normal operation. Therefore, if the converter is stopped based on the condition that these two relays match, the timer 11 becomes unnecessary, high-speed protection is possible, and the possibility of equipment damage can be greatly reduced.
本発明の実施例を第５図に示す。 An embodiment of the invention is shown in FIG.
不足電流継電器９の出力と過電圧継電器１０の
出力をANDゲート１３にて合成しその出力で瞬
時に変換器停止指令を出すものである。 The output of the undercurrent relay 9 and the output of the overvoltage relay 10 are combined by an AND gate 13, and the output instantly issues a converter stop command.
また、この保護方式のバツクアツプとして従来
よりの継電器各々の出力にタイマー１１を入れた
出力も残しておけば、より確実な保護ができる。 Furthermore, as a backup for this protection system, if the output of each conventional relay is also provided with a timer 11, more reliable protection can be achieved.
本発明によれば、保護操作時間が従来の方式に
比べ50〜100ms短縮できる。 According to the present invention, the protection operation time can be shortened by 50 to 100 ms compared to conventional methods.
第１図、第２図は本発明の対象となる系統とそ
の問題点を説明する図、第３図は本発明の対象と
なる現象の説明図、第４図は従来技術の説明図で
あり、第５図は本発明の実施例を示す。
３…変換器、９…不足電流継電器、１０…過電
圧継電器、１１…タイマー、１２…オア回路、１
３…アンド回路。
FIGS. 1 and 2 are diagrams explaining the system to which the present invention is applied and its problems, FIG. 3 is an explanatory diagram of the phenomenon to which the present invention is applied, and FIG. 4 is an explanatory diagram of the prior art. , FIG. 5 shows an embodiment of the invention. 3...Converter, 9...Undercurrent relay, 10...Overvoltage relay, 11...Timer, 12...OR circuit, 1
3...AND circuit.
Claims (1)
つたことを検出する保護継電器と直流電流がある
一定レベル以下になつたことにより動作する保護
継電器の各々の出力の一致条件にて変換装置を停
止させることを特徴とする変換装置の保護方式。1 The converter is stopped when the outputs of the protective relay that detects when the DC voltage exceeds a certain level and the protective relay that operates when the DC current falls below a certain level match. A protection method for a conversion device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5037479A JPS55144727A (en) | 1979-04-25 | 1979-04-25 | Converter protecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5037479A JPS55144727A (en) | 1979-04-25 | 1979-04-25 | Converter protecting system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55144727A JPS55144727A (en) | 1980-11-11 |
| JPS646611B2 true JPS646611B2 (en) | 1989-02-03 |
Family
ID=12857102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5037479A Granted JPS55144727A (en) | 1979-04-25 | 1979-04-25 | Converter protecting system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55144727A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0342105U (en) * | 1989-08-30 | 1991-04-22 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3093674B1 (en) * | 2015-05-14 | 2021-10-20 | General Electric Technology GmbH | Improvements in or relating to direct current distance protection schemes |
| EP3154144B1 (en) | 2015-10-06 | 2020-04-22 | General Electric Technology GmbH | Improvements in or relating to direct current distance protection controllers |
-
1979
- 1979-04-25 JP JP5037479A patent/JPS55144727A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0342105U (en) * | 1989-08-30 | 1991-04-22 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55144727A (en) | 1980-11-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE19600547A1 (en) | Inverter protection circuit for industrial electrical power mains network | |
| Long et al. | Consideration for implementing multiterminal DC systems | |
| CN105098734A (en) | Method and protection and control device for preventing override trip of 10 kV switch | |
| JPS646611B2 (en) | ||
| CN215934513U (en) | AC/DC redundant power supply device suitable for industrial control system | |
| EP0010811A1 (en) | Switching transistor over-voltage protection means | |
| CN209823401U (en) | Elevator control transformer safety protection system | |
| DE2434656A1 (en) | SWITCH-ON INTERLOCK FOR GENERATOR SWITCH | |
| DE4034723C2 (en) | Process for protecting grid-connected inverters | |
| DE2549736C2 (en) | Safety circuit for a line-commutated converter | |
| JPH0614402A (en) | Controller for inverter of electric motor vehicle | |
| JP3085386B2 (en) | Self-excited converter system and control method thereof | |
| JPS6336212B2 (en) | ||
| SU943957A1 (en) | Method of automatic reconnection of power transmission line | |
| US3383562A (en) | Electirical distribution system | |
| JP3212342B2 (en) | Reverse charging prevention device | |
| JPH07107656A (en) | Protecting device for electric power system | |
| JPS6245769B2 (en) | ||
| JPS6122542B2 (en) | ||
| JPH0214293Y2 (en) | ||
| GB2033687A (en) | Switching transistor over-voltage protection | |
| JPS6192165A (en) | Protecting circuit of stepup chopper device | |
| JPS61189123A (en) | Spot network distribution circuit | |
| JPS6240930B2 (en) | ||
| JPS60241719A (en) | Method of controlling thyristor converter |