JPS6338938B2 - - Google Patents
Info
- Publication number
- JPS6338938B2 JPS6338938B2 JP55163774A JP16377480A JPS6338938B2 JP S6338938 B2 JPS6338938 B2 JP S6338938B2 JP 55163774 A JP55163774 A JP 55163774A JP 16377480 A JP16377480 A JP 16377480A JP S6338938 B2 JPS6338938 B2 JP S6338938B2
- Authority
- JP
- Japan
- Prior art keywords
- contact
- breaker
- relay device
- main contact
- lower 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.)
- Expired
Links
- 230000001681 protective effect Effects 0.000 claims description 4
- 230000006698 induction Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 9
- 229910002059 quaternary alloy Inorganic materials 0.000 description 7
- 238000009429 electrical wiring Methods 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
Landscapes
- Emergency Protection Circuit Devices (AREA)
Description
【発明の詳細な説明】
この発明は上位、下位系統を有する電力系統に
おいて、下位系統において事故が発生した場合に
は下位系統に設置されたしや断器をしや断させ、
事故が上位系統にまで波及するのを防止したしや
断器の保護連動装置に関するものである。[Detailed Description of the Invention] In a power system having an upper system and a lower system, when an accident occurs in the lower system, the disconnector installed in the lower system is immediately disconnected.
This invention relates to a protective interlocking device for a breaker that prevents an accident from spreading to the upper system.
第１図は従来の電力系統を示す電力系統図であ
る。第１図において、一次系統１は例えば発電所
から直接電力が供給されるものであり、この一次
系統１から二次系統１Ａ〜１Ｃ、三次系統１Aa
〜１Ac、四次系統１Aa1〜１Aa2がそれぞれ分岐
されている。しや断器２，２Ａ〜２Ｃ，２Aa〜
２Ac，２Aa1〜２Aa2はそれぞれ一次系統１〜四
次系統１Aa2に設置されたものである。計器用変
流器３，３Ａ〜３Ｃ，３Aa〜３Ac，３Aa1〜３
Aa2はそれぞれ一次系統１〜四次系統１Aa2に設
置され、それぞれ一次系統１〜四次系統１Aa2に
流れる電流を検出するものである。過電流継電装
置４，４Ａ〜４Ｃ，４Aa〜４Ac，４Aa1〜４
Aa2はそれぞれ計器用変流器３，３Ａ〜３Ｃ，３
Aa〜３Ac，３Aa1〜３Aa2の出力が所定値以上
になると付勢され、しや断器１，１Ａ〜１Ｃ，１
Aa〜１Ac，１Aa1〜１Aa2をしや断させるもの
である。 FIG. 1 is a power system diagram showing a conventional power system. In Fig. 1, a primary system 1 is one to which power is directly supplied from a power plant, for example, and from this primary system 1 there are secondary systems 1A to 1C and a tertiary system 1Aa.
~1Ac, and quaternary lineages 1Aa 1 to 1Aa 2 are branched, respectively. Shiya disconnector 2, 2A~2C, 2Aa~
2Ac, 2Aa 1 to 2Aa 2 are installed in primary system 1 to quaternary system 1Aa 2 , respectively. Instrument current transformer 3, 3A ~ 3C, 3Aa ~ 3Ac, 3Aa 1 ~ 3
Aa 2 is installed in the primary system 1 to the quaternary system 1Aa 2 , respectively, and detects the current flowing in the primary system 1 to the quaternary system 1Aa 2 , respectively. Overcurrent relay device 4, 4A ~ 4C, 4Aa ~ 4Ac, 4Aa 1 ~ 4
Aa 2 are instrument current transformers 3, 3A to 3C, 3 respectively
When the output of Aa ~ 3Ac, 3Aa 1 ~ 3Aa 2 exceeds a predetermined value, it is energized, and the circuit breakers 1, 1A ~ 1C, 1
Aa to 1Ac, 1Aa 1 to 1Aa 2 are suppressed.
第２図は第１図に示す過電流継電装置４，４Ａ
〜４Ｃ，４Aa〜４Ac，４Aa1〜４Aa2の整定動
作特性曲線図で、横軸に事故電流を縦軸に動作時
間を取つている。第２図において、特性曲線Ｐは
例えば発電所の送出用しや断器に用いられる過電
流継電装置（図示せず）の整定動作特性曲線であ
り、特性曲線４，４Ａ，４Aa，４Aa1はそれぞ
れ過電流継電装置４，４Ａ，４Aa，４Aa1の整
定動作特性曲線である。 Figure 2 shows the overcurrent relay device 4, 4A shown in Figure 1.
〜4C, 4Aa〜4Ac, 4Aa 1 〜4Aa 2 Setting operating characteristic curve diagram, with fault current plotted on the horizontal axis and operating time plotted on the vertical axis. In FIG. 2, a characteristic curve P is a settling operation characteristic curve of an overcurrent relay device (not shown) used, for example, as a transmitter or disconnector in a power plant, and characteristic curves 4, 4A, 4Aa, 4Aa 1 are the settling operation characteristic curves of overcurrent relay devices 4, 4A, 4Aa, and 4Aa 1 , respectively.
次に第１図に示す電力系統の動作を第２図を用
いて説明する。今、第１図に示す点F1において
例えば短絡事故が発生すると、四次〜一次系統１
Aa1〜１に第２図に示す事故電流I1が流れる。こ
の事故電流I1は通常の負荷電流に対してはるかに
大きいため、過電流継電装置４〜４Aa1の誘導円
板はそれぞれ第２図に示す特性曲線４〜４Aa1に
応じて動作する。この場合において過電流継電装
置４Aa1の誘導円板が最初に所定回転角度回転し
て誘導円板に取付けられた接点が最初に閉成す
る。続いて過電流継電装置４Aa，４Ａ，４の接
点が順次閉成するようにそれぞれの整定動作特性
曲線が継電器のタツプ値およびダイヤル値によつ
て設定されている。このためまず過電流継電装置
４Aa1の接点が閉成してしや断器２Aa1をしや断
させ、四次系統１Aa1を他の系統から切離す。四
次系統１Aa1が切離されると事故電流I1がなくな
り、他の過電流継電装置４，４Ａ，４Aaの誘導
円板は逆方向に回転して元の位置に戻る。 Next, the operation of the power system shown in FIG. 1 will be explained using FIG. 2. Now, if a short circuit accident occurs at point F1 shown in Figure 1 , for example, the quaternary to primary system 1
A fault current I 1 shown in FIG. 2 flows through Aa 1 to Aa 1 . Since this fault current I 1 is much larger than the normal load current, the induction disks of the overcurrent relay devices 4 to 4Aa 1 operate according to the characteristic curves 4 to 4Aa 1 shown in FIG. 2, respectively. In this case, the induction disk of the overcurrent relay device 4Aa 1 is first rotated by a predetermined rotation angle, and the contacts attached to the induction disk are closed first. Subsequently, the respective settling operation characteristic curves are set by the tap values and dial values of the relays so that the contacts of the overcurrent relay devices 4Aa, 4A, 4 are sequentially closed. For this reason, first, the contacts of the overcurrent relay device 4Aa 1 are closed to cause the shingle breaker 2Aa 1 to be disconnected, thereby disconnecting the quaternary system 1Aa 1 from other systems. When the quaternary system 1Aa 1 is disconnected, the fault current I 1 disappears, and the induction disks of the other overcurrent relay devices 4, 4A, 4Aa rotate in the opposite direction and return to their original positions.
一般に過電流継電装置４〜４Aa2はそれぞれの
誘導円板オーバローテーシヨン、即ち入力がなく
なつても誘導円板が慣性によつて回転し続ける性
質、並びにしや断器２〜２Aa2のしや断時間を考
慮して、第２図に示す時間t1〜t4のように各過電
流継電装置４〜４Aa2のそれぞれの接点が閉成す
るまでの時間に0.3秒程度以上の時間差を持たせ
て、上位系統のしや断器２〜２Aaが不要にしや
断されるのを防止している。 In general, overcurrent relay devices 4 to 4Aa 2 are designed to control the overrotation of each induction disk, that is, the property that the induction disk continues to rotate due to inertia even if there is no input, as well as the overrotation of each inductor disk breaker 2 to 2Aa 2 . Taking into account the breakage time, the time required for each contact of each overcurrent relay device 4 to 4Aa2 to close is approximately 0.3 seconds or more, as shown in time t1 to t4 shown in Figure 2. By providing a time difference, it is possible to prevent unnecessary disconnection of the upper system disconnectors 2 to 2Aa.
しかしながら例えば発電所の送出用しや断器に
用いられる過電流継電装置（図示せず）の整定動
作特性曲線は第２図に示す特性曲線Ｐのように決
まつているため、二次系統以下にそれぞれ0.3秒
の時間差を持たせて継電器設置の協調を取つてい
たのでは、二次系統以下として二段〜三段しか取
れず、それ以上の場合には上位系統と下位系統と
のしや断器が共にしや断されてしまう可能性があ
つた。この発明は上記のような従来のものの欠点
を除去するためになされたもので、下位系統のし
や断器がしや断された場合には、上位系統のしや
断器の引外し装置を施錠（ロツク）するようにし
たものである。以下図面によつてこの発明の一実
施例を説明する。 However, for example, since the setting operating characteristic curve of an overcurrent relay device (not shown) used for sending out or disconnecting at a power plant is determined as the characteristic curve P shown in Fig. 2, the secondary system If we were to coordinate the installation of relays by giving a time difference of 0.3 seconds to each of the following, we would only be able to install two or three stages below the secondary system, and if there were more than that, the upper system and lower system would There was a possibility that both the shield and the disconnector would be disconnected. This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and when the lower system's shield or disconnector is suddenly disconnected, the upper system's shield or disconnector's tripping device is activated. It is designed to be locked. An embodiment of the present invention will be described below with reference to the drawings.
第３図はこの発明に係るしや断器の保護連動装
置の一実施例を示す電気結線図であり、特に第１
図における四次系統（下位系統）のしや断器２
Aa1と三次系統（上位系統）のしや断器２Aaに
おける引外しコイル部分の電気回路を示したもの
である。第４図は第３図の動作説明用の整定動作
特性曲線図で、横軸に事故電流を縦軸に動作時間
を取つている。第３図において、引外しコイル５
は付勢時にしや断器２Aa1をしや断させるもので
ある。メイン（主）接点６は継電器装置４Aa1の
誘導円板が所定回転角度回転すると第４図の特性
曲線６に応じて閉成するもので、引外しコイル５
とメイン接点６とは直列接続されて正、負電源母
線＋、−間に接続されている。引外しコイル７は
付勢時にしや断器２Aaをしや断させるものであ
る。メイン（主）接点８は継電器装置４Aaの誘
導円板が所定回転角度回転する第４図の特性曲線
８に応じて閉成するものである。サブ（補助）接
点９は継電装置４Aa1の誘導円板が所定回転角度
回転すると第４図の特性曲線９に応じて開放する
ものである。 FIG. 3 is an electrical wiring diagram showing one embodiment of the protective interlocking device for the shield breaker according to the present invention, and in particular, the first
Shiya disconnector 2 of the quaternary system (lower system) in the diagram
This figure shows the electric circuits of the tripping coils in Aa 1 and breaker 2Aa of the tertiary system (upper system). FIG. 4 is a settling operation characteristic curve diagram for explaining the operation of FIG. 3, in which the horizontal axis represents the fault current and the vertical axis represents the operating time. In FIG. 3, the tripping coil 5
is used to cause the shear breaker 2Aa 1 to rupture when energized. The main contact 6 closes according to the characteristic curve 6 in FIG. 4 when the induction disk of the relay device 4Aa 1 rotates by a predetermined rotation angle,
and the main contact 6 are connected in series between the positive and negative power supply buses + and -. The tripping coil 7 causes the crimper breaker 2Aa to rupture when energized. The main contact 8 closes according to the characteristic curve 8 shown in FIG. 4 when the induction disk of the relay device 4Aa rotates by a predetermined rotation angle. The sub (auxiliary) contact 9 opens according to the characteristic curve 9 in FIG. 4 when the induction disk of the relay device 4Aa 1 rotates by a predetermined rotation angle.
次に第３図の動作を第４図を用いて説明する。
今、第１図に示す点F1において例えば短絡事故
が発生すると、四次〜一次系統１Aa1〜１に第４
図に示す事故電流I1が流れる。この事故電流I1が
流れる。この事故電流I1は通常の負荷電流に対し
てはるかに大きいため、過電流継電装置４Aa，
４Aa1の誘導円板が回転し、これら誘導円板に取
付けられたメイン接点６，８は第４図の特性曲線
に応じて閉成し、サブ接点９は開放する。この場
合、サブ接点９が開放した後、時間T1後にメイ
ン接点６が閉成し、さらに時間T2後にメイン接
点８が閉成するように構成されている。従つて、
第３図から明らかなように、メイン接点９が開放
して引外しコイル７を施錠した後、メイン接点６
が閉成して引外しコイル６を付勢し、しや断器２
Aa1をしや断する。 Next, the operation shown in FIG. 3 will be explained using FIG. 4.
Now, for example, if a short circuit occurs at point F 1 shown in Figure 1, the fourth to primary system 1Aa 1 to 1
The fault current I1 shown in the figure flows. This fault current I1 flows. Since this fault current I1 is much larger than the normal load current, the overcurrent relay device 4Aa,
The induction disks 4Aa 1 rotate, the main contacts 6 and 8 attached to these induction disks close in accordance with the characteristic curve shown in FIG. 4, and the sub-contact 9 opens. In this case, after the sub-contact 9 is opened, the main contact 6 is closed after a time T1 , and the main contact 8 is further closed after a time T2 . Therefore,
As is clear from FIG. 3, after the main contact 9 opens and locks the tripping coil 7, the main contact 6
closes and energizes the tripping coil 6, causing the breaker 2 to close.
Break Aa 1 .
このように下位系統のメイン接点６が閉成する
前に下位系統のサブ接点９を開放させ、このサブ
接点９の開放によつて上位系統の引外しコイル７
を施錠するようにしているため、第４図に示す時
間T1，T2が例え０秒であつたとしても上位系統
のしや断器２Aaが引外されることがない。また
しや断器２Aa1がしや断された事故点F1が系統か
らしや断されると、過電流継電装置４Aa1，４
Aaの誘導円板は逆方向に回転して再び元の位置
に戻ため、サブ接点９は再び閉成して上位系統の
引外しコイル７の引外し回路は再び構成される。 In this way, before the main contact 6 of the lower system closes, the sub contact 9 of the lower system is opened, and by opening the sub contact 9, the trip coil 7 of the upper system is opened.
4. Therefore, even if the times T 1 and T 2 shown in FIG. 4 are 0 seconds, the upper system shield breaker 2Aa will not be tripped. When the fault point F1 , where the disconnector 2Aa 1 is suddenly disconnected, is suddenly disconnected from the system, the overcurrent relay devices 4Aa 1 , 4
Since the induction disk Aa rotates in the opposite direction and returns to its original position, the sub-contact 9 is closed again and the tripping circuit of the tripping coil 7 of the upper system is reconfigured.
また、下位系統のしや断器２Aa1による事故点
F1のしや断失敗による救済（バツクアツプ）の
問題は、下位系統の過電流継電装置４Aa1のサブ
接点９を一旦動作した後、一定時間後に復帰させ
るようにすることにより解決している。即ち、こ
のように復帰させることにより上位系統の引外し
コイル７の引外し回路は再び構成されるので、上
位系統のしや断器２Aaによるバツクアツプしや
断が可能となる。ただしこのようなサブ接点９を
一定時間後に復帰させる場合においては、数段に
わたる過電流継電装置４〜４Aa1の協調を取つて
行けば、サブ接点９を復帰させるのに時間がかか
るため、例えば過電流継電装置４と発電所に設置
された過電流継電装置（図示せず）との間に協調
が取れなくなる恐れがある。しかしながら、この
ようなバツクアツプしや断は全段において協調を
取る必要はなく、一部分の段のブロツク毎にバツ
クアツプしや断の協調を取るようにすればよい。
また上記実施例では上位系統の引外し回路に下位
系統のサブ接点９を１個直列接続した場合を示し
たが、例えば二次系統１Ａのしや断器２Ａの引外
し回路（図示せず）に過電流継電器４Aa1のサブ
接点９と過電流継電器４Aaのサブ接点（図示せ
ず）とを直列接続するように構成することもでき
る。さらに上記実施例では、単一の過電流継電器
４Aa1にメイン接点６とサブ接点９とを設けた場
合を示したが、２個の過電流継電器にそれぞれ別
個にメイン接点６とサブ接点９とを設けるように
してもよい。 In addition, the accident point due to lower system disconnection 2Aa 1
The problem of backup caused by failure of F1 is solved by activating the sub-contact 9 of the overcurrent relay device 4Aa 1 in the lower system and then returning it after a certain period of time. . That is, by restoring in this way, the tripping circuit of the tripping coil 7 of the upper system is reconfigured, so that backup and disconnection by the upper system disconnector 2Aa becomes possible. However, in the case of returning such a sub-contact 9 after a certain period of time, it will take time to return the sub-contact 9 if the overcurrent relay devices 4 to 4Aa 1 in several stages are coordinated. For example, there is a possibility that coordination between the overcurrent relay device 4 and an overcurrent relay device (not shown) installed at the power plant may be lost. However, it is not necessary to coordinate such backups and cuts in all stages, but it is sufficient to coordinate backups and cuts for each block in some stages.
Furthermore, in the above embodiment, the case where one sub-contact 9 of the lower system is connected in series to the tripping circuit of the upper system is shown, but for example, the tripping circuit of the disconnector 2A of the secondary system 1A (not shown) Alternatively, the sub-contact 9 of the overcurrent relay 4Aa 1 and the sub-contact (not shown) of the overcurrent relay 4Aa may be connected in series. Furthermore, in the above embodiment, the single overcurrent relay 4Aa 1 is provided with the main contact 6 and the sub contact 9, but two overcurrent relays are provided with the main contact 6 and the sub contact 9 separately. may be provided.
この発明は上記のように構成され、下位系統の
継電装置の主動作より早く動作する補助動作によ
つて、上位系統の引外し回路を施錠するようにし
ているため、電力系統の保護協調を上位系統から
下位系統にわたつて多段数に容易に取ることがで
きる。このため従来においては多段数の系統にわ
たつて系統しや断が行われてもやむを得ないとさ
れていた事故に対しても、事故点の系統のみの選
択しや断が可能となり、電力供給の信頼度が高ま
り、かつ安定した電力を負荷に供給することがで
きる。また、前記補助接点の動作の後一定時間後
にこれを復帰させるようにしているので、下位系
統のしや断器によるしや断失敗があつても上位系
統のしや断器によるバツクアツプしや断が可能で
ある。 This invention is configured as described above, and the tripping circuit of the upper system is locked by the auxiliary operation that operates earlier than the main operation of the relay device of the lower system, thereby improving the protection coordination of the power system. It is possible to easily create multiple stages from the upper system to the lower system. Therefore, even in the event of an accident that was considered unavoidable even if the system was connected or disconnected across multiple stages, it is now possible to select or disconnect only the system at the point of failure, and the power supply can be improved. Reliability is increased and stable power can be supplied to the load. In addition, since the auxiliary contact is reset after a certain period of time after operation, even if there is a failure to disconnect due to the disconnection in the lower system, there will be no backup or disconnection due to the disconnection in the upper system. is possible.
以上のようにこの発明によれば、電力系統の保
護協調を多段数にわたつて取ることができ、電力
供給の信頼度が高まる等の諸効果を有する。 As described above, according to the present invention, protection coordination of the power system can be achieved over multiple stages, and the reliability of power supply is increased, among other effects.
第１図は従来の電力系統を示す電力系統図、第
２図は第１図に示す過電流継電装置の整定動作特
性曲線図、第３図はこの発明に係るしや断器の保
護連動装置の一実施例を示す電気結線図、第４図
は第３図の動作説明用の整定動作特性曲線図であ
る。
図において、１，１Ａ〜１Ｃ，１Aa〜１Ac，
１Aa1〜１Aa2は一次、二次、三次、四次系統、
２，２Ａ〜２Ｃ，２Aa〜２Ac，２Aa1〜２Aa2
はしや断器、４，４Ａ〜４Ｃ，４Aa〜４Ac，４
Aa1〜２Aa2は過電流継電装置、５は引外しコイ
ル、６はメイン（主）接点、７は引外しコイル、
８はメイン（主）接点、９はサブ（補助）接点で
ある。
Fig. 1 is a power system diagram showing a conventional power system, Fig. 2 is a settling operation characteristic curve diagram of the overcurrent relay device shown in Fig. 1, and Fig. 3 is a protection interlocking of the shield breaker according to the present invention. FIG. 4 is an electrical wiring diagram showing one embodiment of the device, and FIG. 4 is a settling operation characteristic curve diagram for explaining the operation of FIG. 3. In the figure, 1, 1A to 1C, 1Aa to 1Ac,
1Aa 1 to 1Aa 2 are primary, secondary, tertiary, quaternary systems,
2, 2A ~ 2C, 2Aa ~ 2Ac, 2Aa 1 ~ 2Aa 2
Chopsticks and disconnectors, 4, 4A to 4C, 4Aa to 4Ac, 4
Aa 1 to 2 Aa 2 is an overcurrent relay device, 5 is a tripping coil, 6 is a main contact, 7 is a tripping coil,
8 is a main contact, and 9 is a sub (auxiliary) contact.
Claims (1)
断器引外し回路を付勢する主接点と前記主接点よ
りも早く動作しかつこの動作後一定時間経過後に
復帰する補助接点とを有する下位系統の継電装
置、および上位系統に設置され前記主接点よりも
遅く動作しかつ動作時に上位系統のしや断器引外
し回路を付勢する主接点を有する上位系統の継電
装置を備え、前記下位系統の継電装置の補助接点
が動作した時にはこの動作によつて前記上位系統
のしや断器引外し回路が付勢されないようにする
と共に、この補助接点が復帰した時にはこの復帰
によつて前記上位系統のしや断器引外し回路を再
形成するようにしたことを特徴とするしや断器の
保護連動装置。 ２ 下位系統の継電装置の主接点と補助接点とを
それぞれ同一継電器に設けた特許請求の範囲第１
項記載のしや断器の保護連動装置。 ３ 下位系統の継電装置の主接点と補助接点とを
それぞれ異なる継電器に設けた特許請求の範囲第
１項記載のしや断器の保護連動装置。[Scope of Claims] 1. A main contact that is installed in the lower system and energizes the circuit breaker tripping circuit of the lower system during operation, and an auxiliary contact that operates earlier than the main contact and returns after a certain period of time after this operation. A relay device for a lower system having a contact, and a relay for an upper system having a main contact installed in the upper system that operates slower than the main contact and energizes the disconnector tripping circuit of the upper system when activated. an electrical device, and when the auxiliary contact of the relay device in the lower system is operated, this operation prevents the breaker tripping circuit of the upper system from being energized, and the auxiliary contact is restored. A protective interlocking device for a shield breaker, characterized in that the reset causes a circuit breaker tripping circuit of the upper system to be reconfigured. 2 Claim 1 in which the main contacts and auxiliary contacts of the relay device of the lower system are provided in the same relay, respectively.
Protective interlocking device for breaker as described in section. 3. A protection interlocking device for a shield breaker according to claim 1, wherein the main contact and the auxiliary contact of the relay device of the lower system are provided in different relays.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16377480A JPS5788826A (en) | 1980-11-19 | 1980-11-19 | Protecting interlocking device for breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16377480A JPS5788826A (en) | 1980-11-19 | 1980-11-19 | Protecting interlocking device for breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5788826A JPS5788826A (en) | 1982-06-02 |
| JPS6338938B2 true JPS6338938B2 (en) | 1988-08-02 |
Family
ID=15780457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16377480A Granted JPS5788826A (en) | 1980-11-19 | 1980-11-19 | Protecting interlocking device for breaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5788826A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57113727A (en) * | 1980-12-29 | 1982-07-15 | Fuji Electric Co Ltd | Overcurrent relay |
| JPH0767236B2 (en) * | 1988-12-23 | 1995-07-19 | 株式会社日立製作所 | Distribution line protection device |
| EP2654156B1 (en) * | 2012-04-17 | 2021-05-26 | Siemens Energy AS | Fault protection system for a power system of dynamically positioned vessel |
| EP2654157B1 (en) | 2012-04-17 | 2022-07-20 | Siemens Energy AS | Fault protection system for a power system of dynamically positioned vessel |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5297141A (en) * | 1976-02-12 | 1977-08-15 | Mitsubishi Electric Corp | Short-circuit protection relay system |
-
1980
- 1980-11-19 JP JP16377480A patent/JPS5788826A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5297141A (en) * | 1976-02-12 | 1977-08-15 | Mitsubishi Electric Corp | Short-circuit protection relay system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5788826A (en) | 1982-06-02 |
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