JPH0743392B2 - Voltage detector - Google Patents
Voltage detectorInfo
- Publication number
- JPH0743392B2 JPH0743392B2 JP62031399A JP3139987A JPH0743392B2 JP H0743392 B2 JPH0743392 B2 JP H0743392B2 JP 62031399 A JP62031399 A JP 62031399A JP 3139987 A JP3139987 A JP 3139987A JP H0743392 B2 JPH0743392 B2 JP H0743392B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- phase
- resistance
- input
- value
- 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 - Lifetime
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- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、例えば変電設備における充電部での三相電
圧の有無を検知する電圧検知装置、特に１個の増巾器で
三相平衡電圧の有無を検知する電圧検知装置に関するも
のである。The present invention relates to a voltage detection device for detecting the presence or absence of a three-phase voltage in a charging section of a substation, for example, a three-phase balanced voltage with a single amplifier. The present invention relates to a voltage detection device that detects the presence or absence of
第４図は例えば特開昭51−115662号公報および実開昭52
−120326号公報に示されたものと同様な従来の電圧検知
装置を示す構成図である。図において、（1A），（1
B），（1C）は三相電圧の各相例えばＡ相,B相,C相のた
めの外被であつて、図示のように一括して接続されてい
る。同様に、（2A），（2B），（2C）はそれぞれ外被
（1A），（1B），（1C）内の中心部に挿通されて電圧が
印加される充電部例えば充電部導体、（3A），（3B），
（3C）はそれぞれ外被（1A），（1B），（1C）内で充電
部導体（2A），（2B），（2C）と対向して設けられかつ
各相電圧を検知するための検出部例えばアンテナ、（4
A），（4B），（4C）はそれぞれ検出部（3A），（3
B），（3C）と大地の間に接続されて各入力抵抗、（5
A），（5B），（5C）はそれぞれ入力抵抗（4A），（4
B），（4C）の両端面に接続されて各入力抵抗から出力
を得る増巾器、そして（6A），（6B），（6C）はそれぞ
れ検出部（3A），（3B），（3C）に取り付けられて各検
出部を外被（1A），（1B），（1C）から電気的に絶縁す
る絶縁支持物である。FIG. 4 shows, for example, Japanese Patent Application Laid-Open No. 51-115662 and Japanese Utility Model Publication No.
FIG. 11 is a configuration diagram showing a conventional voltage detection device similar to that shown in Japanese Patent Laid-Open No. 120326. In the figure, (1A), (1
B) and (1C) are jackets for each phase of the three-phase voltage, for example, A phase, B phase, and C phase, which are collectively connected as shown. Similarly, (2A), (2B), and (2C) are inserted into the central portions of the jackets (1A), (1B), and (1C), respectively, to which a charging portion, for example, a charging portion conductor, to which a voltage is applied, ( 3A), (3B),
(3C) is provided inside the jackets (1A), (1B), (1C) so as to face the charging section conductors (2A), (2B), (2C) and detects for detecting each phase voltage. Part eg antenna, (4
A), (4B), and (4C) are detectors (3A) and (3
B), (3C) and each input resistance connected between the ground and (5
A), (5B), and (5C) are input resistances (4A) and (4
B) and (4C) are connected to both ends of the amplifier to obtain output from each input resistance, and (6A), (6B), and (6C) are detectors (3A), (3B), and (3C), respectively. ) Is an insulating support that is attached to each of the detectors and electrically insulates each detection unit from the jackets (1A), (1B), and (1C).
従来の電圧検知装置は上述したように構成されており、
充電部導体（2A），（2B），（2C）に電圧が印加される
と、外被（1A），（1B），（1C）に対して電界が発生す
る。この電界中に、外被（1A），（1B），（1C）から外
縁された電極（後述する）があると、静電的に誘導され
た誘導電流が電極と大地の間に流れる。この電極が検出
部（3A），（3B），（3C）であり、充電部導体（2A），
（2B），（2C）と検出部（3A），（3B），（3C）との間
にはその距離に反比例し、また電極面積に比例した静電
容量CA,CB,CCがそれぞれ得られる。この静電容量CA,CB,
CCのインピーダンスが電圧検知装置の入力抵抗（4A），
（4B），（4C）のインピーダンスよりも十分大きいた
め、充電部導体（2A），（2B），（2C）と検出部（3
A），（3B），（3C）との間の静電誘導により流れる誘
導電流iA,iB,iCはそれぞれ静電容量CA,CB,CCによつて決
まる。この誘導電流iA,iB,iCが入力抵抗（4A），（4
B），（4C）〔それぞれ同一の抵抗値R0を有する〕を流
れることにより電圧iA×R0＝VA,iB×R0＝Vb,ic×R0＝VC
が発生する。発生した電圧はそれぞれの増巾器（5A），
（5B），（5C）によつてさらに増巾される。増巾された
電圧はレベル検出され、充電，非充電の表示として例え
ばランプ表示される。The conventional voltage detection device is configured as described above,
When a voltage is applied to the live part conductors (2A), (2B), (2C), an electric field is generated in the outer jackets (1A), (1B), (1C). In this electric field, if there are electrodes (described later) that are surrounded by the jackets (1A), (1B), and (1C), an electrostatically induced induced current flows between the electrodes and the ground. This electrode is the detection part (3A), (3B), (3C), the charging part conductor (2A),
Between (2B), (2C) and the detection parts (3A), (3B), (3C), the capacitances C A , C B , C C inversely proportional to the distance and proportional to the electrode area are provided. You get each. This capacitance C A , C B ,
The impedance of C C is the input resistance (4 A) of the voltage detection device,
Since the impedance is sufficiently higher than the impedances of (4B) and (4C), the live part conductors (2A), (2B), (2C) and the detection part (3
The induced currents i A , i B , i C flowing by electrostatic induction between A), (3B) and (3C) are determined by the capacitances C A , C B , C C , respectively. This induced current i A , i B , i C is input resistance (4A), (4A
B) and (4C) [having the same resistance R 0 ], the voltage i A × R 0 = V A , i B × R 0 = V b , i c × R 0 = V C
Occurs. The generated voltage is applied to each amplifier (5A),
It is further widened by (5B) and (5C). The increased voltage is level-detected and is displayed, for example, by a lamp as an indication of charging or non-charging.
第５図は第６図の入力抵抗（4A），（4B），（4C）の両
端間にそれぞれ発生した電圧Va,Vb,Vcを示すベクトル図
である。電圧Va,Vb,Vcのそれぞれよりも若干小さい値に
検出レベルを設定しておけば、そのレベル値より各電圧
が大きければ充電、小さければ非充電の表示が得られ
る。FIG. 5 is a vector diagram showing the voltages Va, Vb, Vc generated across the input resistors (4A), (4B), (4C) of FIG. 6, respectively. If the detection level is set to a value slightly smaller than each of the voltages Va, Vb, and Vc, if the voltage is higher than the level value, the indication of charging is obtained, and if the voltage is smaller than that value, the indication of non-charging is obtained.
従来の電圧検知装置では、一相毎に電圧を検知するの
で、三相電圧を検知しようとすれば各相毎に１セツト、
全部で３セツトの検知手段が必要であつた。もし３相電
圧を１個台の増巾器で検知しようとしても、第５図に示
したように大きさが同一でかつ位相が120゜づつ遅れて
いるVa＋Vb＋Vcのベクトル総和は０となる。すなわち、
三相の電圧が充電されているにもかかわらず、電圧検知
装置は電圧無しの表示をしてしまうという問題点があつ
た。また、このような問題点を解決しようとすれば各相
毎に増巾器が必要となり、設備が大きくなるという問題
点もあつた。In the conventional voltage detecting device, the voltage is detected for each phase. Therefore, if three-phase voltage is detected, one set for each phase is
A total of 3 sets of detection means was required. Even if the three-phase voltage is detected by one amplifier, the vector sum of Va + Vb + Vc, which have the same magnitude and are delayed by 120 ° in phase, becomes 0 as shown in FIG. That is,
Even if the three-phase voltage is charged, there is a problem that the voltage detection device displays a no voltage. Further, in order to solve such a problem, a widening device is required for each phase, which causes a problem that the equipment becomes large.
この発明は、上述した問題点を解決するためになされた
もので、三相電圧の有無を１個の増巾器で検知する電圧
検知装置を得ることを目的とする。The present invention has been made in order to solve the above-mentioned problems, and an object thereof is to obtain a voltage detection device that detects the presence or absence of a three-phase voltage with a single amplifier.
この発明に係る電圧検知装置は三相の電圧のそれぞれが
印加される充電部と、各充電部との間で静電容量を形成
する検出部と、全ての検出部と大地の間に接続された入
力抵抗と、この入力抵抗の両端間に接続された増巾器
と、各検出部と大地の間で入力抵抗と直列に接続された
抵抗と、各抵抗および入力抵抗から成る直列回路と並列
に接続された可変抵抗とを設けたものである。The voltage detection device according to the present invention is connected between a charging unit to which each of the three-phase voltages is applied, a detecting unit that forms a capacitance between each charging unit, and all the detecting units and the ground. The input resistance, the amplifier connected across the input resistance, the resistance connected in series with the input resistance between each detector and the ground, and the series circuit consisting of each resistance and the input resistance in parallel. And a variable resistor connected to.
この発明において、各抵抗の抵抗値を入力抵抗の抵抗値
に比べて十分大きくし、三相のうちの一相の誘導電流値
が他の二相の誘導電流値の所定倍となるように可変抵抗
の抵抗値を調整することにより、１個の増巾器で三相の
電圧を検知できる。In the present invention, the resistance value of each resistor is made sufficiently larger than the resistance value of the input resistor, and the induced current value of one of the three phases is changed to be a predetermined multiple of the induced current value of the other two phases. By adjusting the resistance value of the resistor, it is possible to detect the three-phase voltage with one amplifier.
第１図はこの発明の一実施例を示す構成図であり、（1
A）〜（1C），（2A）〜（2C），（3A）〜（3C）および
（6A）〜（6C）は従来と同一のものであり、また
（４），（５）は例えばそれぞれ入力抵抗（4A）、増巾
器（5A）に相当する。（21A），（21B），（21C）は各
検出部（3A），（3B），（3C）と大地の間で唯一の入力
抵抗（４）と直列に接続された抵抗（同一の抵抗値R1を
有する）である。この抵抗値R1は、入力抵抗（４）の抵
抗値R0と比べて十分大きく、R1＋R0≒R1の関係になるよ
うな値である。（22A），（22B），（22C）は入力抵抗
（４）と直列に接続されたR1に対して並列に接続された
可変抵抗で、各相毎に接続されている。FIG. 1 is a block diagram showing an embodiment of the present invention.
A) to (1C), (2A) to (2C), (3A) to (3C) and (6A) to (6C) are the same as the conventional ones, and (4) and (5) are, for example, respectively. It corresponds to the input resistance (4A) and the amplifier (5A). (21A), (21B), and (21C) are resistors (same resistance value) connected in series with the only input resistor (4) between each detector (3A), (3B), (3C) and ground. R 1 ). The resistance value R 1 is sufficiently larger than the resistance value R 0 of the input resistance (4) and has a relationship of R 1 + R 0 ≈R 1 . (22A), (22B), (22C) are variable resistors connected in parallel to R 1 which is connected in series with the input resistor (4), and are connected for each phase.
また、充電部導体（2A），（2B），（2C）と検出部（3
A），（3B），（3C）の間の静電容量CA,CB,CCのインピ
ーダンスは入力抵抗（４）に直列接続されて抵抗値R1が
加えられても十分大きいため、誘導電流iA,iB,iCは静電
容量で決まる。Also, the charging section conductors (2A), (2B), (2C) and the detection section (3
Since the impedances of the electrostatic capacitances C A , C B , C C between A), (3B) and (3C) are sufficiently large even if the resistance value R 1 is added in series with the input resistance (4), The induced currents i A , i B , and i C are determined by the capacitance.
第１図の回路においては、R1＋R0≒R1の関係があるた
め、各相の誘導電流iA,iB,iCはR1と可変抵抗値RA,RB,RC
の関係で分流される。いま、RAの抵抗値をR1に比べて十
分大きくし、RB,RCの抵抗値をR1と等しい値に調整する
と、入力抵抗（４）へ流れる各相電流はiA1≒iA,iB1≒1
/2iB,iC1≒1/2iCとなる。この誘導電流により、各相の
入力電圧Va′＝iA×R0,Vb＝1/2iB×R0,Vc＝1/2iC×R0と
なり、Ａ相の入力電圧はVa′他の相の２倍となる。ただ
しiA,iB,iCは充電部導体（2A），（2B），（2C）と検出
部（3A），（3B），（3C）の間の静電容量CA,CB,CCが各
相同一のためiA＝iB＝iCとなつている。しかし位相は12
0゜づつ遅れているため、第２図のベクトル図のように
なる。In the circuit of FIG. 1 , because of the relationship of R 1 + R 0 ≈R 1 , the induced currents i A , i B , i C of each phase are R 1 and the variable resistance values R A , R B , R C.
Will be diverted due to the relationship. Now, if the resistance value of R A is made sufficiently larger than that of R 1 and the resistance values of R B and R C are adjusted to values equal to R 1 , the phase currents flowing to the input resistance (4) will be i A1 ≈ i A , i B1 ≈1
/ 2i B , i C1 ≈ 1 / 2i C. Due to this induced current, the input voltage of each phase becomes Va ′ = i A × R 0 , Vb = 1 / 2i B × R 0 , Vc = 1 / 2i C × R 0 , and the input voltage of phase A becomes It is twice the phase. However, i A , i B , i C are capacitances C A , C B ,, between the charging part conductors (2A), (2B), (2C) and the detecting parts (3A), (3B), (3C). Since C C is the same for each phase, i A = i B = i C. But the phase is 12
Since it is delayed by 0 °, it becomes like the vector diagram in FIG.
また、Ａ相の可変抵抗値RAをR1と等しい値に調整し、Ｂ
相,C相の可変抵抗値RB,RCを抵抗値R1より十分大きい値
にすれば、入力電圧は一相のみ他の二相の1/2倍とな
り、第３図のベクトル図に示すようになる。Also, adjust the A-phase variable resistance value R A to a value equal to R 1 ,
If the variable resistance values R B and R C for phase C and phase C are made sufficiently larger than the resistance value R 1 , the input voltage will be half that of the other two phases. As shown.
このように、第２図，第３図で得られた結果をベクトル
和すると、Va′＋Vb＋VcまたはＶ″＋Vb＋Vc＝Vbまたは
Vcとなり、一相を検出するのと同等となる。一相を検出
する入力電圧値より少し小さい値でレベル検出をすれ
ば、三相充電時は一相検出と同様になる。また、三相の
うちどれか一相または二相が充電されていなくても、検
出することが出来る。すなわち、三相のうち一相でも電
圧が充電されていると電圧検出が出来る。Thus, the vector sum of the results obtained in FIGS. 2 and 3 yields Va ′ + Vb + Vc or V ″ + Vb + Vc = Vb or
Vc, which is equivalent to detecting one phase. If level detection is performed with a value slightly smaller than the input voltage value for detecting one phase, it becomes the same as one-phase detection during three-phase charging. Further, it is possible to detect even if any one or two of the three phases is not charged. That is, the voltage can be detected if the voltage is charged even in one of the three phases.
なお、上記実施例では充電部導体と検出部の間の静電容
量を同一にした場合であつたが、各相で静電容量値が異
なつていつてもよい。しかも、一相の電圧を特に２倍,1
/2倍に限定しなくてもよい。In addition, in the above embodiment, the capacitance between the charging portion conductor and the detection portion is the same, but the capacitance value may be different in each phase. Moreover, especially the voltage of one phase is doubled, 1
It does not have to be limited to twice.
以上のように、この発明によれば、三相の電圧のそれぞ
れが印加される充電部と、各充電部との間で静電容量を
形成する検出部と、全ての検出部と大地の間に接続され
た入力抵抗と、この入力抵抗の両端間に接続された増巾
器と、各検出部と大地の間で入力抵抗と直列に接続され
た抵抗と、各抵抗および入力抵抗から成る直列回路と並
列に接続された可変抵抗とを設けたので、三相電圧の有
無を１個の増巾器で検知できる効果がある。As described above, according to the present invention, the charging unit to which each of the three-phase voltages is applied, the detection unit that forms an electrostatic capacitance between each charging unit, and all the detection units and the ground. The input resistance connected to the input resistance, the amplifier connected across the input resistance, the resistance connected in series with the input resistance between each detector and the ground, and the series consisting of each resistance and the input resistance. Since the variable resistor connected in parallel with the circuit is provided, the presence or absence of the three-phase voltage can be detected by one amplifier.
第１図はこの発明の一実施例を示す構成図、第２図はこ
の発明の一実施例のそして第３図は変形例の電圧検知ベ
クトル図、第４図は従来の電圧検知装置を示す構成図、
第５図は従来の電圧検知装置における電圧検知ベクトル
図である。 図において、（2A）と（2B）と（2C）は充電部導体、
（3A）と（3B）と（3C）は検出部、（４）は入力抵抗、
（５）は増巾器、（21A）と（21B）と（21C）は抵抗、
（22A）と（22B）と（22C）は可変抵抗である。 なお、各図中、同一符号は同一又は相当部分を示す。FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a voltage detection vector diagram of an embodiment of the present invention and FIG. 3 is a modification, and FIG. 4 is a conventional voltage detection device. Diagram,
FIG. 5 is a voltage detection vector diagram in the conventional voltage detection device. In the figure, (2A), (2B) and (2C) are the live part conductors,
(3A), (3B) and (3C) are detectors, (4) is input resistance,
(5) is an amplifier, (21A), (21B) and (21C) are resistors,
(22A), (22B) and (22C) are variable resistors. In each figure, the same reference numerals indicate the same or corresponding parts.
Claims (3)
と、各充電部との間で静電容量を形成する検出部と、全
ての検出部に共通に接続されかつ各検出部から大地に流
れる誘導電流を電圧に変換する入力抵抗と、この入力抵
抗の両端間に接続された増巾器と、前記各検出部と大地
の間で前記入力抵抗と直列に接続されその抵抗値に比べ
て十分大きい抵抗値を有する抵抗と、各抵抗および前記
入力抵抗から成る直列回路と並列に接続され、前記三相
のうちの一相の誘導電流値が他の二相の誘導電流値の所
定倍となるように調整される可変抵抗とを備えたことを
特徴とする電圧検知装置。1. A charging unit to which each of the three-phase voltages is applied, a detecting unit that forms an electrostatic capacitance between each charging unit, and a detecting unit that is commonly connected to all the detecting units and is connected from each detecting unit. An input resistance for converting an induced current flowing in the ground into a voltage, a widening device connected between both ends of the input resistance, and a resistance value connected in series with the input resistance between each of the detection units and the ground. A resistor having a sufficiently large resistance value is connected in parallel with a series circuit including each resistor and the input resistor, and the induced current value of one of the three phases is a predetermined value of the induced current value of the other two phases. A voltage detecting device, comprising: a variable resistor adjusted to be doubled.
特許請求の範囲第１項記載の電圧検知装置。2. The voltage detection device according to claim 1, wherein the predetermined multiple is twice or more.
る特許請求の範囲第１項記載の電圧検知装置。3. The voltage detection device according to claim 1, wherein the predetermined multiple is 1/2 or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62031399A JPH0743392B2 (en) | 1987-02-16 | 1987-02-16 | Voltage detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62031399A JPH0743392B2 (en) | 1987-02-16 | 1987-02-16 | Voltage detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63200073A JPS63200073A (en) | 1988-08-18 |
| JPH0743392B2 true JPH0743392B2 (en) | 1995-05-15 |
Family
ID=12330180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62031399A Expired - Lifetime JPH0743392B2 (en) | 1987-02-16 | 1987-02-16 | Voltage detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0743392B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05240891A (en) * | 1992-02-26 | 1993-09-21 | Togami Electric Mfg Co Ltd | Detecting device for service interruption of high voltage three-phase ac power source of isolated neutral system |
| JP4330256B2 (en) * | 2000-08-09 | 2009-09-16 | 大阪瓦斯株式会社 | Non-contact voltage measuring method and apparatus |
| JP4814740B2 (en) * | 2006-09-22 | 2011-11-16 | サンデン株式会社 | Inverter device |
-
1987
- 1987-02-16 JP JP62031399A patent/JPH0743392B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63200073A (en) | 1988-08-18 |
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