JPS6016122A - Current differential relay - Google Patents
Current differential relayInfo
- Publication number
- JPS6016122A JPS6016122A JP58123379A JP12337983A JPS6016122A JP S6016122 A JPS6016122 A JP S6016122A JP 58123379 A JP58123379 A JP 58123379A JP 12337983 A JP12337983 A JP 12337983A JP S6016122 A JPS6016122 A JP S6016122A
- Authority
- JP
- Japan
- Prior art keywords
- current
- transmission line
- current differential
- differential relay
- power transmission
- 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.)
- Pending
Links
Landscapes
- 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】
〔発明の利用分野〕
本発明は、分路リアクトルで補償されている系統に設置
される電流差動リレーに係り、特に、受電端負荷しゃ断
時にも良好な特性ｔうる方式に関する。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a current differential relay installed in a system compensated with a shunt reactor, and in particular has good characteristics even when the receiving end load is cut off. Regarding the method.
従来の電流差動ＩＪ Ｖ−は、単に送電線両端の電流の
ベクトル和をめて、事故の内外判定を行なっていた。こ
のため、ＬＩＨＶ系統のように静電容量の大きな系統に
分路リアクトルが設置されているような場合には、基本
周波数に近い電流が、送電線の両端に異なった割合で流
れる。このため、前述のように電流のベクトル和をめた
場合には、健全状態であるにもかかわらず、内部事故と
みるような欠点がめった。Conventional current differential IJV- simply calculates the vector sum of the currents at both ends of the power transmission line to determine whether an accident is occurring or not. For this reason, when a shunt reactor is installed in a system with a large capacitance, such as an LIHV system, currents close to the fundamental frequency flow at different rates at both ends of the power transmission line. For this reason, when calculating the vector sum of the currents as described above, defects that appear to be internal accidents occur frequently even though the device is in a healthy state.
本発明の目的は、送電線の両端に基本周波数に近い低次
高調波が異なった比率で流れた場合にも、正規に判定で
きる電流差動リレーを提供するにある。An object of the present invention is to provide a current differential relay that can make a correct determination even when low-order harmonics close to the fundamental frequency flow at different ratios at both ends of a power transmission line.
本発明の要点は従来の電流差動リレーの他に、基本波成
分の大きさ及び低次高調波の大きさの比率をめ、低次高
調波成分が基本波成分を上まわった場合には、従来構成
の電流差動ＩＪ Ｌ／−の動作を阻止しようとするもの
である。The key point of the present invention is that in addition to the conventional current differential relay, the ratio of the magnitude of the fundamental wave component and the magnitude of the lower harmonics is determined, and when the lower harmonic component exceeds the fundamental wave component, , which attempts to prevent the operation of the current differential IJ L/- of the conventional configuration.
以下、本発明の一実施例を第１図により説明する。同図
は、電気所Ｇ、が送電線ｔを介して、電気所Ｇ、に電力
を送っている例を示している。同図では、送ｔｕｓｔの
静電容量を一括してＣで示してあり、送電線ｔの両端の
母線Ｂ、、Ｂ、にに分路リアクトルＬ ｓ ｈ １ 及
びｌ ａ ｈ ２が設置され、送′亀線の両端にはしゃ
断器及び電流変成器ＣＢ、、ＣＢ、。An embodiment of the present invention will be described below with reference to FIG. The figure shows an example in which electric station G is sending power to electric station G via power transmission line t. In the figure, the capacitance of the transmission line t is collectively indicated by C, and shunt reactors L sh 1 and l a h 2 are installed on the bus bars B, , B, at both ends of the transmission line t, There are circuit breakers and current transformers CB, CB, at both ends of the transmission line.
ＣＴ、 、 Ｃ’ｌ’、が設置され、受電端電気所Ｇ２
にはしゃ断器ＣＢ３が設置されている。このような系統
でしゃ断器ＣＢ、を開放すると、電流変成器ｃＴ。CT, , C'l', are installed, and the receiving end electrical station G2
A circuit breaker CB3 is installed. In such a system, when breaker CB is opened, current transformer cT.
には充電電流に相当する電流１１及び、静電容量Ｃと分
路リアクトルＬｓｂｌ 、 Ｌ＠１．１及び発電機のり
アクタンスＬ、で定まる低次の高調波成分ｉ。１゜ｉｃ
ｌが流れ、受電端の電流変成器ＣＴ、には分路リアクト
ルＩｇｂｔで定まる低次の篩調波成分１゜が流れる。is a current 11 corresponding to the charging current, and a low-order harmonic component i determined by the capacitance C, the shunt reactor Lsbl, L@1.1, and the generator actance L. 1゜ic
l flows, and a low-order sieve harmonic component 1° determined by the shunt reactor Igbt flows through the current transformer CT at the receiving end.
第１図の定数をもとに、インダクタンス及び静電容量を
示すと第２図のようにあられされる。同図より等価イン
ダクタンスＬ、をめると、次のようにあられされる。Based on the constants shown in FIG. 1, the inductance and capacitance are shown in FIG. 2. From the same figure, when the equivalent inductance L is included, it is obtained as follows.
この値と靜′亀容量Ｃより共振周波数ｆｋ求めると、
となり、Ｌ］ＨＶ系統の電源系統約５００ｋｍに約１０
０係の補償をすると、（２）式のｆは７０Ｈｚ程度の値
となる。この時の′１流の大きさく■。＝Ｉ。１＋１．
、十Ｉ。、）は
■。＝２πｆＣΔＥ（３）
で表わされる。ここでΔＥＦｉ、静電容量Ｃの電圧の変
化分とする。第１図のしゃ断器ＣＢ、ｉｊ電流管の点で
しゃ断され、力率が１．０から０に変化することから、
電圧の変化分は、定格電圧となる。電圧１０００ｋＶ
、 Ｃ＝ １０μＦ１ｆに７０ Ｈｚとして、１．をめ
ると、
■。：２Ｘ３．１４Ｘ７０Ｘ１５Ｘ１０−’Ｘ１００Ｏ
ＸＩｃ中６ｋＡとなる。この値が゛電流変成器ＣＴ、及
びＣＴ、に分流して約３ｋＡ程度ずつ流れる。これに対
し、光電［流Ｉ、は、
Ｉ、 ＝２Ｘ３．１４Ｘ５０Ｘ１５Ｘ１０−’Ｘ１００
ＯＸＩＯ”中４．７ ｋＡ（４）
でめる。ここで、Ｉ、 、 Ｉ。、■。ｌ ＋ Ｉｅ２
、、■。、はｊ ｌ １ ｉｃｌ ＬＩ Ｉ ｉ！、
Ｉ Ｉｓ３の実効値を示す。If we calculate the resonance frequency fk from this value and the capacitance C, we get:
When the zero coefficient is compensated for, f in equation (2) becomes a value of about 70 Hz. The size of the '1st class at this time■. =I. 1+1.
, Ten I. , ) is ■. =2πfCΔE(3) Here, ΔEFi is the change in voltage of the capacitance C. Since the current is cut off at the point of breaker CB and ij current tube in Figure 1, and the power factor changes from 1.0 to 0,
The amount of change in voltage becomes the rated voltage. Voltage 1000kV
, C=10 μF1f and 70 Hz, 1. ■. :2X3.14X70X15X10-'X100O
It becomes 6kA in XIc. This value is divided into current transformers CT and CT, and flows approximately 3 kA each. On the other hand, the photocurrent [current I, I, =2X3.14X50X15X10-'X100
4.7 kA (4) in "OXIO".Here, I, , I., ■.l + Ie2
,,■. , is j l 1 icl LI I i! ,
I Indicates the effective value of Is3.
このように、低次の高調波成分は充電電流と同程度であ
る。このため、従来構成である１ ’ＴＩ ’Ｔ！ｌ
Ｊｌ’ｔｔｌ＋Ｉ’ｔ＊ｌ）７ム （４）で動作判定し
た場合には、周波数の関係が考慮されていないため、低
次高調波のみで誤動作する恐れがある。In this way, the low-order harmonic components are comparable to the charging current. For this reason, the conventional configuration of 1 'TI 'T! l
Jl'ttl+I't*l)7mu When the operation is determined in (4), the frequency relationship is not taken into account, so there is a risk of malfunction due to only low-order harmonics.
ここで、（４）式のｉ〒Ｉｓ’〒２と同一のｊｌ＊ｊｅ
ｌ＋ｊ ｅｔ ＋ Ｆｊの関係は
ｉ７．＝ｉ、 −１、、Ｆｔｅ 鳳 Ｔｔ ＝ ｉｃｌ
（５）とする。電流差動リレーが誤動作した場合には
、しゃ断器ＣＢ、、ＣＢ、にしゃ断信号を発するため、
系統は分断され、供給信頼度の低下をまねくと共に復旧
時間が延びるという欠点があった。第１図では保護リレ
ー装置Ｒアで電流差動リレーの処理を行なうものとする
。第１図において、充電電流ｉ、の補償は、種々検討さ
れており、送電線亘長でほぼ定まるという特徴がある。Here, jl*je which is the same as i〒Is'〒2 in equation (4)
The relationship of l+j et + Fj is i7. = i, −1,, Fte Tt = icl
(5). If the current differential relay malfunctions, it will issue a cutoff signal to the circuit breaker CB, CB,
This had the disadvantage that the grid was divided, leading to a decline in supply reliability and prolonging the restoration time. In FIG. 1, it is assumed that the protection relay device Ra performs the processing of the current differential relay. In FIG. 1, compensation for the charging current i has been studied in various ways, and has the characteristic that it is almost determined by the length of the power transmission line.
これに対し、前述の低次の共振成分ｉ 、ｔｆｌ、発電
機の運転台数の影ｗを受けることになる。ＵＨＶ系統の
定数をもとに算出した例では、低次の高調波の次数は前
述の通り基本波の１．５倍程度である。このため、高調
波除去用のフィルタを設けても除去することは困難であ
る。また、ｉＩＬ流値は充電電流の数倍に達する場合も
ある。このような状況でも正規に判断させようとするも
のである。On the other hand, it is affected by the aforementioned low-order resonance components i, tfl, and the number w of operating generators. In the example calculated based on the constants of the UHV system, the order of the lower harmonic is about 1.5 times that of the fundamental wave, as described above. Therefore, it is difficult to remove harmonics even if a filter for removing harmonics is provided. Additionally, the iIL current value may reach several times the charging current. The aim is to ensure that legal judgments are made even in such situations.
このため、′ｔＬ流変成器ＣＴ、及びＣＴ２の′電流情
報を一定時間間隔でサンプリングし、この情報をもとに
調波分析により各周波数成分をめ、基本波成分との比を
とり、この比がミ１以上では、従来構成の１！流差動Ｉ
Ｊ Ｖ−の動作を阻止しようとするものである。第３図
は、この状況を示したものであり、電流変成器ＣＴ、、
Ｃ’ｌ’、の出力を１゜Ｔ。Therefore, the current information of the tL flow transformers CT and CT2 is sampled at regular time intervals, and based on this information, each frequency component is determined by harmonic analysis, and the ratio with the fundamental wave component is calculated. If the ratio is more than 1, the conventional configuration is 1! Flow differential I
This is an attempt to prevent the operation of JV-. Figure 3 shows this situation and shows the current transformers CT, .
The output of C'l' is 1°T.
１ｅＴ２で示す。この情報をもとに、従来構成の電流差
動１３７−の処理を行なう部分子１ｔｙｌと本発明の特
徴である構成部分几ア、の処理を行なう。Ｒｙ！の出力
がある場合には、）１．、の動作を阻止アンド（ロ）路
Ａ、で行なう。几ア、の詳細を第４図に示す。同図では
、取り込んだデータをもとに各周波数成分を算出し、基
本波以外の低次高調波成分の最大のもの全基本波成分で
割った値が１以上では出力を発する。このようにするこ
とにより、低次高調波による誤動作を阻止できる。Indicated by 1eT2. Based on this information, processing is performed on the component 1tyl that performs the processing of the current differential 137- of the conventional configuration and the component processing that is a feature of the present invention. Ry! If there is an output of )1. The operations of , are performed by the blocking and (b) path A. The details of 几AA are shown in Fig. 4. In the figure, each frequency component is calculated based on the captured data, and if the maximum low-order harmonic component other than the fundamental wave divided by all fundamental wave components is 1 or more, an output is generated. By doing so, malfunctions due to low-order harmonics can be prevented.
ここで用いている各周波数成分の算出法は各種あること
はいうまでもない。Needless to say, there are various methods of calculating each frequency component used here.
電流差動ＩＪ Ｌ／−に要求される動作時間は事故発生
後数１０ＷＳであり、この時間内に、負荷しゃ断による
低次高調波の発生か、事故による基本波成分の増大かを
区別する必要がある。基本波と低次高調波の周波数差が
前述のように約２０Ｈｚ程度である場合には、１／２０
＝０．０５ （ｓｅｃ）、すなわち、５０ｗ５あれば
区別することができ、電流差動リレーの動作時間を遅ら
せることはない。The operating time required for the current differential IJ L/- is several 10 WS after the accident occurs, and within this time it is necessary to distinguish between the generation of low-order harmonics due to load cutoff and the increase in the fundamental wave component due to the accident. There is. If the frequency difference between the fundamental wave and the lower harmonic is about 20Hz as mentioned above, 1/20
= 0.05 (sec), that is, 50w5 can be used to differentiate, and the operation time of the current differential relay will not be delayed.
本発明によれば、静電容量をもつ系統に設置されるｉａ
ｉ差動１） Ｌ／−の正規動作を確保することができる
。According to the present invention, ia installed in a system with capacitance
i differential 1) Normal operation of L/- can be ensured.
第１図は本発明の概要説明図、第２図は低次高調波の発
生余水す図、第３図は本発明の詳細な説明図、第４図に
本発明の特徴部分の処理フロー図である。
Ｇｌ 、 Ｇ２・・・電気所、ｔ・・・送電線、Ｃ・・
・静電容量、Ｂ、、Ｂ、・・・母線、Ｌａｂ＋ ＋ Ｉ
ｊａｈ２・・・分路リアクトル、ＣＢ、ンＣＢ３・・・
しゃ断器、ＣＴ、、Ｃ’ｌ’３・・・電流変成器、Ｌｌ
・・・発電機リアクタンス、ｉａｌ ”” ｉａｌ・・
・低次高調波成分、ｉｌ ・・・充電電流、Ｒｙ・・・
保護リレー、Ｒｙ、・・・従来構成の保謙りＶ−機能、
Ｒ２，・・・本願の％徴とする保設リレー機能、Ａ１・
・・アンド回路、’ｃＴＩ 、 ’ｃＴｔ・・・Ｃ’Ｉ
’、、ＣＴ、より得られる電流情報。
代理人 弁理士 ＾橋明夫
第１匣
〜Φ
第２図
１０７
第３図
茶４図Fig. 1 is a schematic explanatory diagram of the present invention, Fig. 2 is a diagram showing the generation of low-order harmonics, Fig. 3 is a detailed explanatory diagram of the present invention, and Fig. 4 is a processing flow of the characteristic parts of the present invention. It is a diagram. Gl, G2...Electric station, t...Transmission line, C...
・Capacitance, B, , B, ... Bus bar, Lab+ + I
jah2...Shunt reactor, CB, CB3...
Breaker, CT, C'l'3...Current transformer, Ll
... Generator reactance, ial "" ial...
・Low-order harmonic component, il...Charging current, Ry...
Protection relay, Ry...Conventional configuration protection V-function,
R2, . . . storage relay function, which is a feature of the present application, A1.
・・AND circuit, 'cTI, 'cTt...C'I
', ,Current information obtained from CT. Agent Patent Attorney ＾Akio Hashi Box 1 ~ Φ Figure 2 107 Figure 3 Tea Figure 4
Claims (1)
Ｓｔ−行なう方式において、 前記送電線の一端の前記電圧、電流情報の低次高調波成
分が基本波成分全土まわる場合には、前記送電線の両端
の前記電圧、電流情報を用いて保護区間内部事故全検出
している装置の動作出力を阻止する手段を設けたことを
特徴とする電流差動リレー。[Scope of Claims] 1. In a method of maintaining the power transmission line using voltage and current information of the power transmission line, a lower harmonic component of the voltage and current information at one end of the power transmission line is a fundamental wave. A current differential relay, characterized in that a current differential relay is provided with a means for blocking the operational output of a device that detects all faults within a protected area using the voltage and current information at both ends of the power transmission line when the entire component is circulated. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58123379A JPS6016122A (en) | 1983-07-08 | 1983-07-08 | Current differential relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58123379A JPS6016122A (en) | 1983-07-08 | 1983-07-08 | Current differential relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6016122A true JPS6016122A (en) | 1985-01-26 |
Family
ID=14859118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58123379A Pending JPS6016122A (en) | 1983-07-08 | 1983-07-08 | Current differential relay |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6016122A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63169103A (en) * | 1986-12-23 | 1988-07-13 | ボール、コーパレイシヤン | Radio frequency antenna |
| JPS63199503A (en) * | 1987-02-13 | 1988-08-18 | Nippon Hoso Kyokai <Nhk> | Microstrip antenna |
| JPS63258104A (en) * | 1987-04-15 | 1988-10-25 | Matsushita Electric Works Ltd | Plane antenna |
-
1983
- 1983-07-08 JP JP58123379A patent/JPS6016122A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63169103A (en) * | 1986-12-23 | 1988-07-13 | ボール、コーパレイシヤン | Radio frequency antenna |
| JPS63199503A (en) * | 1987-02-13 | 1988-08-18 | Nippon Hoso Kyokai <Nhk> | Microstrip antenna |
| JPS63258104A (en) * | 1987-04-15 | 1988-10-25 | Matsushita Electric Works Ltd | Plane antenna |
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