JPH09322392A - Sensing method for abnormality of capacitor device - Google Patents
Sensing method for abnormality of capacitor deviceInfo
- Publication number
- JPH09322392A JPH09322392A JP8132259A JP13225996A JPH09322392A JP H09322392 A JPH09322392 A JP H09322392A JP 8132259 A JP8132259 A JP 8132259A JP 13225996 A JP13225996 A JP 13225996A JP H09322392 A JPH09322392 A JP H09322392A
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- current
- blocks
- abnormality
- capacitor device
- 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
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Protection Of Static Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、所定数のコンデン
サを所定の配列で接続したコンデンサブロックを複数
組、並列接続した大容量コンデンサ装置の異常検出方法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormality detecting method for a large-capacity capacitor device in which a plurality of capacitor blocks each having a predetermined number of capacitors connected in a predetermined array are connected in parallel.
【０００２】[0002]
【従来の技術】自励式無効電力補償装置やＶＶＶＦ、Ｃ
ＶＣＦ等はエネルギーを直流で蓄えておくエネルギー蓄
積部として大容量コンデンサ装置を備えており、その一
例として自励式無効電力補償装置に用いたものを図２を
参照して次に示す。上記コンデンサ装置（１）は所定数
の各等容量のコンデンサ（Ｃ）…（１個のみ図示）を直
列接続したコンデンサブロック（Ｓ）…を複数組、並列
接続したもので、コンデンサ（Ｃ）…の直列接続により
必要な電圧を確保し、且つ、それを複数組、並列接続す
ることにより必要な容量を確保する。そして、コンデン
サ装置（１）の入力側を整流器（２）を介して交流電源
（Vt）に接続すると共に、出力側をインバータ装置
（３）の入力側に接続し、インバータ装置（３）の出力
側を連系インピーダンス（Ｚ）を介して系統電源（Vs）
に接続する。2. Description of the Related Art Self-excited reactive power compensator, VVVF, C
The VCF and the like are provided with a large-capacity capacitor device as an energy storage unit for storing energy in the form of direct current, and as an example thereof, a device used in a self-excited reactive power compensator is shown with reference to FIG. The above-mentioned capacitor device (1) is formed by connecting a plurality of sets of capacitor blocks (S) ... In which a predetermined number of capacitors (C) of equal capacity (only one is shown) are connected in series. The required voltage is ensured by the series connection of and the required capacity is ensured by connecting a plurality of sets in parallel. Then, the input side of the capacitor device (1) is connected to the AC power supply (Vt) via the rectifier (2), and the output side is connected to the input side of the inverter device (3) to output the output of the inverter device (3). Power source (Vs) via the interconnection impedance (Z) on the side
Connect to.
【０００３】上記構成において、交流電源（Vt）の電圧
を整流器（２）で整流してコンデンサ装置（１）を直流
充電し、その充電電圧をインバータ装置（３）に給電し
てインバータ出力を連系インピーダンス（Ｚ）を介して
系統側に供給する。In the above structure, the voltage of the AC power source (Vt) is rectified by the rectifier (2) to charge the capacitor device (1) with direct current, and the charged voltage is supplied to the inverter device (3) to connect the inverter output. It is supplied to the system side via the system impedance (Z).
【０００４】ここで、上記コンデンサ装置（１）の異常
有無を検出する際、まずコンデンサブロック（Ｓ）…毎
にそれぞれ直列にヒューズ（Fa）…を挿入し、且つ、コ
ンデンサ装置（１）のインバータ側に直列にヒューズ
（Fb）及び検出用直流変流器（Tb）を挿入して直流変流
器出力を過電流検出器（４）に接続する。そして、コン
デンサ装置（１）に過電流が流れると、直ちにヒューズ
（Fa）…（Fb）が溶断して遮断される。When detecting the presence / absence of abnormality in the capacitor device (1), first, fuses (Fa) are inserted in series for each capacitor block (S), and the inverter of the capacitor device (1) is inserted. A fuse (Fb) and a detection DC current transformer (Tb) are inserted in series on the side to connect the DC current transformer output to the overcurrent detector (4). Then, when an overcurrent flows through the capacitor device (1), the fuses (Fa) ... (Fb) are blown and cut off immediately.
【０００５】[0005]
【発明が解決しようとする課題】解決しようとする課題
は、コンデンサブロック（Ｓ）…に短絡等によりコンデ
ンサ定格電流の10〜100倍以上の十分に大きい過電流が
流れた場合、ヒューズ（Fa）（Fb）は容易に溶断する
が、熱的劣化時のコンデンサ容量変化による電圧分担変
動や共振拡大等により全電流は変わらなくてもコンデン
サブロック（Ｓ）…毎の分流が変化し、定格の２〜３倍
程度の過電流がコンデンサ（Ｃ）…に流れて過負荷にな
った場合、ヒューズ（Fa）…を溶断するには不十分であ
るため、半溶断して接続不良になり、それが持続又は断
続すると、最終的にヒューズ（Fa）…の爆発事故やコン
デンサ（Ｃ）…の急速な劣化等を招く点である。The problem to be solved is that when a sufficiently large overcurrent of 10 to 100 times the rated current of the capacitor or more flows in the capacitor block (S) due to a short circuit or the like, the fuse (Fa) (Fb) is easily blown out, but the shunt current of each capacitor block (S) changes, even if the total current does not change due to fluctuations in voltage sharing due to changes in capacitor capacity during thermal degradation and resonance expansion, etc. If an overcurrent of about 3 times flows into the capacitor (C) ... and becomes overloaded, it is not enough to blow the fuse (Fa) .... If it is sustained or intermittent, it will eventually cause an explosion accident of the fuses (Fa), rapid deterioration of the capacitors (C), and the like.
【０００６】即ち、上記共振拡大の場合、大容量コンデ
ンサ装置（１）…では配線上の仮想インダクタンス
（Ｌ）…を無視出来ず、しかも仮想インダクタンス
（Ｌ）…が配線毎に異なるため、それらと各コンデンサ
（Ｃ）…とがインバータ（３）から見て互いに異なる並
列共振回路を形成する。そうすると、各共振回路の隣接
する共振周波数の間で各共振曲線が交叉し、その間で各
共振回路がそれぞれ容量性及び誘導性インピーダンスと
なって互いに反対極性の共振電流が流れる。That is, in the case of the resonance expansion described above, in the large-capacity capacitor device (1), the virtual inductance (L) on the wiring cannot be ignored, and the virtual inductance (L) differs for each wiring. The capacitors (C) and the like form parallel resonant circuits which are different from each other when viewed from the inverter (3). Then, the resonance curves intersect between the adjacent resonance frequencies of the resonance circuits, and the resonance circuits become capacitive and inductive impedances, respectively, during which resonance currents of opposite polarities flow.
【０００７】例えば図３（ａ）に示す等価回路において
インバータ（３）から見てコンデンサ（Ca）と仮想イン
ダクタンス（La）とからなる共振回路（Ａ）では、図３
（ｂ）に示すように、共振周波数（fa=1/2π√(LaCa)）
の共振曲線（Xa）となり、共振周波数（fa）より高周波
の領域では誘導性、低周波の領域では容量性になる。
又、インバータ（３）から見て仮想インダクタンス（L
a）（Lb）とコンデンサ（Cb）とからなる隣接の共振回
路（Ｂ）では共振周波数（fb=1/2π√{(La+Lb)Cb}）の
共振曲線（Xb）となり、同様に共振周波数（fb）より高
周波の領域では誘導性、低周波の領域では容量性とな
る。そうすると、誘導性領域と容量性領域とでは互いに
反対極性の共振電流が流れるため、共振周波数（fa）
（fb）間では共振回路（Ａ）（Ｂ）にそれぞれ互いに逆
方向の共振電流が流れる。For example, in the equivalent circuit shown in FIG. 3A, the resonance circuit (A) consisting of the capacitor (Ca) and the virtual inductance (La) as viewed from the inverter (3) has
As shown in (b), resonance frequency (fa = 1 / 2π√ (LaCa))
The resonance curve (Xa) becomes, and the resonance frequency (fa) becomes inductive in a higher frequency region and becomes capacitive in a low frequency region.
Also, the virtual inductance (L
a) Resonance curve (Xb) of resonance frequency (fb = 1 / 2π√ {(La + Lb) Cb}) in the adjacent resonance circuit (B) consisting of (Lb) and capacitor (Cb), and similarly resonance It becomes inductive in the high frequency region above the frequency (fb) and capacitive in the low frequency region. Then, since the resonance currents of opposite polarities flow in the inductive region and the capacitive region, the resonance frequency (fa)
Between (fb), resonant currents in opposite directions flow through the resonant circuits (A) and (B).
【０００８】そこで、共振回路（Ａ）において時計方向
にループ電流（Ia）が流れるとすると、共振回路（Ｂ）
のコンデンサ（Ca）（Cb）とインダクタンス（Lb）とで
形成した閉ループ内では共振周波数（fa）（fb）間で半
時計方向にループ電流（Ib）が流れる。そのため、コン
デンサ（Ca）に図の下から上に電流（Ia）（Ib）が加算
されて流れ、隣接するコンデンサ（Cb）に図の上から下
に電流（Ib）が流れる。その結果、共振周波数（fa）
（fb）間に入る電流成分があると、コンデンサ（Ca）に
流れる分流は加算電流（Ia+Ib）となる一方、コンデン
サ（Cb）に流れる分流は電流（Ia）となって互いに電圧
分担が異なり、特にコンデンサ（Ca）を流れる分流（Ia
+Ib）は拡大する。そこで、上述したように、共振拡大
分流（Ia+Ib）は定格より数倍程度の過電流であっても
溶断には不十分であるため、ヒューズ（Fa）…が半溶断
し、それが持続又は断続すると、最終的にヒューズ（F
a）…の爆発事故やコンデンサ（Ｃ）…の急速な劣化或
いは短絡事故等を招く。Therefore, assuming that the loop current (Ia) flows in the clockwise direction in the resonance circuit (A), the resonance circuit (B).
In the closed loop formed by the capacitors (Ca) (Cb) and the inductance (Lb), the loop current (Ib) flows counterclockwise between the resonance frequencies (fa) (fb). Therefore, the currents (Ia) and (Ib) are added to the capacitor (Ca) from the bottom to the top and flow, and the current (Ib) flows from the top to the bottom in the adjacent capacitor (Cb). As a result, the resonance frequency (fa)
If there is a current component that enters between (fb), the shunt current that flows in the capacitor (Ca) becomes the added current (Ia + Ib), while the shunt current that flows in the capacitor (Cb) becomes the current (Ia) and the voltage is shared by them. Different, especially the shunt (Ia
+ Ib) expands. Therefore, as mentioned above, the resonance expansion shunt (Ia + Ib) is not enough to blow even if the overcurrent is several times higher than the rated value, so the fuse (Fa) ... Or if it is interrupted, the fuse (F
a) Explosion accident, rapid deterioration of capacitor (C) ... or short circuit accident.
【０００９】[0009]
【課題を解決するための手段】本発明は、所定数のコン
デンサを所定の配列で接続したコンデンサブロックを複
数組、並列接続した大容量コンデンサ装置の異常有無を
検出するにあたり、上記コンデンサブロックに流れるコ
ンデンサ電流を各ブロック毎に個別に検出し、検出した
コンデンサ電流が許容レベルを超えた時、装置異常と判
定することを特徴とする。SUMMARY OF THE INVENTION According to the present invention, a plurality of sets of capacitor blocks each having a predetermined number of capacitors connected in a predetermined array are connected to a large-capacity capacitor device connected in parallel. The capacitor current is individually detected for each block, and when the detected capacitor current exceeds an allowable level, it is determined that the device is abnormal.
【００１０】[0010]
【発明の実施の形態】本発明に係るコンデンサ装置の異
常検出方法の実施の形態を図１を参照して以下に説明す
る。図２に示す部分と同一部分には同一参照符号を付し
てその説明を省略する。相違する点は、本発明に係るコ
ンデンサ装置（５）においてコンデンサブロック（Ｓ）
…毎に検出用直流変流器（Ta）…を挿入してその出力を
コンデンサ過電流検出器（６）に接続したことで、それ
により各コンデンサブロック（Ｓ）…毎に個別にコンデ
ンサ電流（Ｉ）…を検出して定格以上の過電流を検出す
る。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a method for detecting abnormality in a capacitor device according to the present invention will be described below with reference to FIG. The same parts as those shown in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted. The difference lies in the capacitor block (S) in the capacitor device (5) according to the present invention.
By inserting a detection DC current transformer (Ta) for each ... and connecting its output to the capacitor overcurrent detector (6), the capacitor current (Ta) is individually supplied to each capacitor block (S). I) ... is detected to detect overcurrent exceeding the rated value.
【００１１】上記構成においてコンデンサブロック
（Ｓ）…毎に個別にコンデンサ電流（Ｉ）を検出して判
定回路（図示せず）に入力し、許容レベルを超えるコン
デンサ過電流を検出した時、装置に異常が発生したと判
定して装置を停止する。この場合、本発明はコンデンサ
（Ｃ）…の経時的な熱的劣化時の容量変化による電圧分
担異常や共振拡大による分流アンバランスによって発生
する過電流を検出して保護するもので、過渡的に発生す
る過電流及びそれによって発生する異常を検出する必要
はない。そのため、コンデンサ電流（Ｉ）を瞬時、検出
する必要はなく、過電流検出器（６）で検出したコンデ
ンサ電流（Ｉ）から所定時間の平均値や実効値（検出時
定数は数10〜100msec程度）を算出して判定回路に入力
し、それが許容レベルを超えた時、過電流が継続的に発
生して装置に異常が発生したと判定することが好まし
い。In the above structure, the capacitor current (I) is individually detected for each capacitor block (S) and is input to the determination circuit (not shown). When a capacitor overcurrent exceeding the allowable level is detected, the device is instructed. When it is judged that an abnormality has occurred, the device is stopped. In this case, the present invention detects and protects an overcurrent generated due to an abnormal voltage sharing due to a change in capacitance when the capacitors (C) are thermally deteriorated over time or a shunt imbalance due to resonance expansion. It is not necessary to detect the generated overcurrent and the abnormality caused thereby. Therefore, it is not necessary to instantly detect the capacitor current (I), and the average value or the effective value of the capacitor current (I) detected by the overcurrent detector (6) for a predetermined time (the detection time constant is about several tens to 100 msec). ) Is calculated and input to a determination circuit, and when it exceeds an allowable level, it is preferable to determine that an overcurrent is continuously generated and an abnormality has occurred in the device.
【００１２】[0012]
【発明の効果】本発明によれば、所定数のコンデンサを
所定の配列で接続したコンデンサブロックを複数組、並
列接続した大容量コンデンサ装置の異常有無を検出する
にあたり、コンデンサブロックに流れるコンデンサ電流
を各ブロック毎に個別に検出し、検出したコンデンサ電
流が許容レベルを超えた時、装置異常と判定するように
したから、コンデンサブロック毎に過電流から保護する
ことが出来、共振拡大過電流発生時にも確実に過電流保
護が可能となって装置の品質、安全性の向上を実現出来
る。According to the present invention, when detecting the presence or absence of abnormality in a large-capacity capacitor device in which a plurality of capacitor blocks each having a predetermined number of capacitors connected in a predetermined array are connected in parallel, the capacitor current flowing through the capacitor blocks is detected. Each block is individually detected, and when the detected capacitor current exceeds the allowable level, it is judged as a device abnormality, so it is possible to protect from overcurrent for each capacitor block, and when resonance overcurrent occurs. With this, overcurrent protection can be reliably achieved, and the quality and safety of the device can be improved.
【図１】本発明に係るコンデンサ装置の異常検出方法の
実施の形態を示す回路図である。FIG. 1 is a circuit diagram showing an embodiment of a method for detecting abnormality in a capacitor device according to the present invention.
【図２】従来のコンデンサ装置の異常検出方法の一具体
例を示す回路図である。FIG. 2 is a circuit diagram showing a specific example of a conventional method for detecting an abnormality in a capacitor device.
【図３】（ａ）は図２のコンデンサ装置の等価回路図で
ある。（ｂ）は図３（ａ）の等価回路の共振曲線図であ
る。FIG. 3 (a) is an equivalent circuit diagram of the capacitor device of FIG. FIG. 3B is a resonance curve diagram of the equivalent circuit of FIG.
５ コンデンサ装置 ６ コンデンサ過電流検出器 Ｃ コンデンサ Ｓ コンデンサブロック Ta 検出用変流器 5 Capacitor device 6 Capacitor overcurrent detector C Capacitor S Capacitor block Ta Current transformer for detection
Claims (1)
したコンデンサブロックを複数組、並列接続した大容量
コンデンサ装置の異常有無を検出するにあたり、上記コ
ンデンサブロックに流れるコンデンサ電流を各ブロック
毎に個別に検出し、検出したコンデンサ電流が許容レベ
ルを超えた時、装置異常と判定することを特徴とするコ
ンデンサ装置の異常検出方法。1. When detecting whether or not there is an abnormality in a large-capacity capacitor device in which a plurality of capacitor blocks each having a predetermined number of capacitors connected in a predetermined array are connected in parallel, the capacitor currents flowing through the capacitor blocks are individually supplied to each block. A method for detecting an abnormality in a capacitor device, which is characterized in that when the detected capacitor current exceeds an allowable level, it is determined that the device is abnormal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8132259A JPH09322392A (en) | 1996-05-27 | 1996-05-27 | Sensing method for abnormality of capacitor device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8132259A JPH09322392A (en) | 1996-05-27 | 1996-05-27 | Sensing method for abnormality of capacitor device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09322392A true JPH09322392A (en) | 1997-12-12 |
Family
ID=15077101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8132259A Pending JPH09322392A (en) | 1996-05-27 | 1996-05-27 | Sensing method for abnormality of capacitor device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09322392A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012019680A (en) * | 2011-01-27 | 2012-01-26 | Soung Chun Jho | Ipl apparatus with explosion prevention function of electrolytic capacitor |
| JP2016011953A (en) * | 2014-06-04 | 2016-01-21 | 株式会社Ｔｏｐ | Power semiconductor test apparatus |
| JP2018054390A (en) * | 2016-09-28 | 2018-04-05 | 株式会社ケーヒン | Voltage detecting device |
-
1996
- 1996-05-27 JP JP8132259A patent/JPH09322392A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012019680A (en) * | 2011-01-27 | 2012-01-26 | Soung Chun Jho | Ipl apparatus with explosion prevention function of electrolytic capacitor |
| JP2016011953A (en) * | 2014-06-04 | 2016-01-21 | 株式会社Ｔｏｐ | Power semiconductor test apparatus |
| JP2018054390A (en) * | 2016-09-28 | 2018-04-05 | 株式会社ケーヒン | Voltage detecting device |
| US10845420B2 (en) | 2016-09-28 | 2020-11-24 | Keihin Corporation | Voltage detecting apparatus |
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