JPH03142380A - Alarm signal generating method for insulation deterioration - Google Patents
Alarm signal generating method for insulation deteriorationInfo
- Publication number
- JPH03142380A JPH03142380A JP28109589A JP28109589A JPH03142380A JP H03142380 A JPH03142380 A JP H03142380A JP 28109589 A JP28109589 A JP 28109589A JP 28109589 A JP28109589 A JP 28109589A JP H03142380 A JPH03142380 A JP H03142380A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- measurement
- transformer
- leakage current
- signal
- 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
- 238000009413 insulation Methods 0.000 title claims abstract description 23
- 230000006866 deterioration Effects 0.000 title claims description 5
- 238000000034 method Methods 0.000 title claims description 5
- 238000005259 measurement Methods 0.000 claims abstract description 25
- 238000002347 injection Methods 0.000 claims abstract description 10
- 239000007924 injection Substances 0.000 claims abstract description 10
- 230000001360 synchronised effect Effects 0.000 abstract description 5
- 230000005856 abnormality Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 238000004804 winding Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
- Measurement Of Current Or Voltage (AREA)
- Emergency Alarm Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、活線状態で電路の絶縁抵抗を測定する装置の
絶縁劣化警報信号発生方法に間する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for generating an insulation deterioration alarm signal for a device that measures the insulation resistance of an electrical circuit under live conditions.
従来の絶縁抵抗測定装置を第２図に示す。 A conventional insulation resistance measuring device is shown in FIG.
商用周波数と異なる測定用低周波信号を電力増幅部で増
幅した後、注入用変圧器を介して、第２種接地線に印加
し、電路の絶縁抵抗及び対地静電容量を通して帰還する
漏洩電流を変流器で検出し、フィルタ部により検出した
漏洩電流中、測定用低周波成分のみを抽出し、さらに同
期！１流部で絶縁抵抗に起因する成分のみを選別する。After amplifying the measurement low-frequency signal, which differs from the commercial frequency, in the power amplifier section, it is applied to the second type grounding wire via the injection transformer, and the leakage current that returns through the insulation resistance and ground capacitance of the electrical circuit is absorbed. Only the low frequency components for measurement are extracted from the leakage current detected by the current transformer and detected by the filter section, and further synchronized! Only components caused by insulation resistance are selected in the first flow section.
この方法によって得られる信号は、注入用変圧器接地線
側巻線端の測定用低周波信号電圧が一定の場合、絶縁抵
抗値に比例した信号となり、比較部であらかじめ設定し
た警報設定値と比較して発生する信号を１１報信号とし
ている。The signal obtained by this method is a signal proportional to the insulation resistance value when the measurement low frequency signal voltage at the end of the winding on the grounding wire side of the injection transformer is constant, and is compared with the preset alarm setting value in the comparator. The signal generated by this is called the 11th report signal.
一般に絶縁抵抗測定装置で設定するｉＩ報段設定値数に
Ω〜数十にΩてあり、非常に微小な漏洩電流を取り扱っ
ているが絶縁抵抗値の極端な劣化が発生した場合、商用
周波数成分の漏洩電流が増加し、フィルタ部が飽和する
ため正常な測定を維持することが困難となる。In general, the number of iI report settings set by an insulation resistance measuring device ranges from Ω to several tens of Ω, and although extremely small leakage currents are handled, if extreme deterioration of the insulation resistance value occurs, the commercial frequency component The leakage current increases and the filter section becomes saturated, making it difficult to maintain normal measurements.
又、重地絡事故等絶縁抵抗が数Ωとなった場合には注入
用変圧器接地線側巻線端の測定用低周波信号電圧を一定
に保つことがきわめて困難となり前述同様正常な測定の
維持ができなくなる。In addition, if the insulation resistance becomes several Ω due to a heavy ground fault, it will be extremely difficult to maintain the low frequency signal voltage for measurement at the end of the winding on the ground wire side of the injection transformer, making it difficult to maintain normal measurement as described above. become unable to do so.
第１図（ａ）を用いて、本発明を説明する。電路に絶縁
劣化が発生した場合、第２種接地抵抗に帰還する漏洩電
流１ｏは商用周波電圧により流れる漏洩電流Ｉｏ （
商）と、測定用低周波電圧により流れる漏洩電流１ｏ
（測）のベクトル和であり、次式で与えられる
１ｏ＝Ｉｏ（商）＋Ｉｏ（測）
商用周波電圧が１００Ｖ又は２００Ｖであるのに対し測
定用低周波電圧が一般に約２ｖ以下であることから、Ｉ
ｏ （商）に比べｒｏ （測）は非常に小さい。The present invention will be explained using FIG. 1(a). When insulation deterioration occurs in the electrical circuit, the leakage current 1o that returns to the second type grounding resistor is the leakage current Io that flows due to the commercial frequency voltage (
quotient) and the leakage current 1o flowing due to the low frequency voltage for measurement
It is the vector sum of (measured) and is given by the following formula: 1o = Io (quotient) + Io (measured) Since the commercial frequency voltage is 100V or 200V, the low frequency voltage for measurement is generally about 2V or less. , I
ro (measurement) is very small compared to o (quotient).
この漏洩電流を変流器で検出すると変流器２次側に誘起
する電圧Ｖｏは終端抵抗をＲＬＩ 商用周波数での変流
器の電流変換係数をに＋、ｆｊ＋Ｉ定用周波数での変流
器の電流変換係数をに２として
Ｖｏ＝に＋−Ｒｃｌｏ（商）十に２・ＲＬ・ｉｏ（測）
となる。When this leakage current is detected by a current transformer, the voltage Vo induced on the secondary side of the current transformer is the terminating resistor RLI. Assuming that the current conversion coefficient of is 2, Vo = +-Rclo (quotient) 10 to 2・RL・io (measurement)
becomes.
同式中、フィルタ部によりに１・ＲＬ−Ｉｏ（商）を除
去し、ｋ２・ＲＬ・Ｉｏ（測）から同期整流部により絶
縁抵抗外に比例した電圧Ｖ、を取り出す従来の回路構成
に加え、変流器の２次電圧ＶＯからあらかじめ設定した
電圧ｖ、ｆを減算し、その結果得られる電圧が正の場合
通過するダイオードを設は電圧Ｖｂを得る。In the same equation, in addition to the conventional circuit configuration, the filter section removes 1・RL−Io (quotient), and the synchronous rectifier extracts a voltage V proportional to the insulation resistance from k2・RL・Io (measurement). , a preset voltage v, f is subtracted from the secondary voltage VO of the current transformer, and if the resulting voltage is positive, a diode is provided to pass through, and a voltage Vb is obtained.
さらに、電圧Ｖ、と電圧Ｖｂをアナログ加算することに
より得られる電圧Ｖｃ （＝ Ｖａ ＋ Ｖｂ）と警報
設定値とを比較する比較部を設けこの比較部の出力を警
報信号とする。Furthermore, a comparator is provided to compare the alarm setting value with the voltage Vc (=Va + Vb) obtained by analog addition of the voltage V and the voltage Vb, and the output of this comparator is used as an alarm signal.
変流器の２次電圧Ｖｏの波高値が電圧ｖ０１以下の場合
電圧Ｖｂが零であるため電圧Ｖ、のみとなる。When the peak value of the secondary voltage Vo of the current transformer is less than or equal to the voltage v01, the voltage Vb is zero, so there is only the voltage V.
すなわち、絶縁抵抗測定動作である。That is, this is an insulation resistance measurement operation.
又変流器の２次電圧Ｖｏの波高値が電圧Ｖ７゜ｆ以上の
場合、Ｖ ａ ＜ ＜ Ｖ ｂなる重み付けを行うこと
により電圧Ｖｂが支配的となる。電圧Ｖｂは商用周波数
の漏洩ＴＩ！、流が測定用低周波の漏洩電流より十分に
大きいため、電圧Ｖｂでの動作ということは商用周波数
の漏洩電流動作と考えられる。よって、電圧Ｖ、。１を
絶縁抵抗動作から商用周波数の漏洩電流動作に切り替え
たい電圧値に設定することにより商用周波数の漏洩電流
が増加しフィルタ部が飽和し、正常な測定が不可能な領
域であっても警報信号を維持することができる。Further, when the peak value of the secondary voltage Vo of the current transformer is equal to or higher than the voltage V7°f, the voltage Vb becomes dominant by weighting Va<<Vb. Voltage Vb is commercial frequency leakage TI! , the current is sufficiently larger than the leakage current of the measurement low frequency, so operation at voltage Vb can be considered as leakage current operation of the commercial frequency. Therefore, the voltage V. By setting 1 to the voltage value at which you want to switch from insulation resistance operation to commercial frequency leakage current operation, the alarm signal can be sent even if the leakage current at the commercial frequency increases and the filter section is saturated, making normal measurement impossible. can be maintained.
さらに、商用周波数による漏洩電流動作であるため、注
入用変圧器の有無にも依存しない。Furthermore, since the leakage current operation is based on the commercial frequency, it does not depend on the presence or absence of an injection transformer.
第１図（ｂ）を用いて本発明の詳細な説明する。測定用
低周波信号を測定用低周波信号発生部で発生させ、電力
増幅部を通り注入用変圧器により第２種接地線に印加す
る。The present invention will be explained in detail using FIG. 1(b). A measurement low frequency signal is generated by a measurement low frequency signal generation section, passes through a power amplification section, and is applied to the second type grounding wire by an injection transformer.
第２種接地線に貫通させた変流器の出力はフィルタ部、
同期！１流部を通り、加算回路の片端の入力に加わり、
従来技術の絶縁抵抗動作を行う回路を構成する。又、変
流器の出力は減算回路部、ダイオードを通り、加算回路
の片端の入力に加わり過Ｔ！Ｌ流発生時のバイパス回路
を構成する。加算回路の出力はあらかじめ設定した警報
設定電圧値と比較し警報信号を発生する表示部に接続す
る。The output of the current transformer passed through the second type grounding wire is the filter section,
Sync! Passes through the first flow section, joins the input at one end of the adder circuit,
A circuit that performs a conventional insulation resistance operation is constructed. Also, the output of the current transformer passes through the subtracting circuit section and the diode, and is added to the input at one end of the adding circuit. Configures a bypass circuit when L flow occurs. The output of the adder circuit is compared with a preset alarm setting voltage value and connected to a display section that generates an alarm signal.
本構成において、第２種接地線に流れる商用周波数の漏
洩電流が減算回路部の電圧Ｖ ｒｏｔに相当する値以下
の場合はダイオードの出力は電圧発生しないため、従来
技術の絶縁抵抗動作を行う。In this configuration, when the commercial frequency leakage current flowing through the second type grounding line is less than the value corresponding to the voltage V rot of the subtraction circuit section, the output of the diode does not generate a voltage, so that the conventional insulation resistance operation is performed.
又、商用周波数漏洩電流が電圧ｖ ｒｏｔに相当する値
以上の場合はダイオードの出力に電圧が発生するためフ
ィルタ部、同期整流部の動作とは関係なく商用周波数の
漏洩電流動作となる。Furthermore, if the commercial frequency leakage current is equal to or greater than the voltage v rot , a voltage is generated at the output of the diode, so that the leakage current operates at the commercial frequency regardless of the operation of the filter section and the synchronous rectification section.
このように警報動作を絶縁抵抗動作から漏洩？ｉ流動作
に連続的に変化させることにより、過電流時のフィルタ
部の飽和による測定不能や注入用変圧器の印加電圧値低
下による測定異常を補償することができる。Does the alarm operation leak from the insulation resistance operation in this way? By continuously changing the i-current operation, it is possible to compensate for measurement failure due to saturation of the filter section during overcurrent and measurement abnormality due to a drop in the voltage applied to the injection transformer.
さらに本回路は、従来回路に加算回路部及び減算回路部
を追加するだけで構成することが可能であり、加算回路
部は一般に従来回路の同）ＩＪＩｔＩ流部後、比較部ま
での間に必要となる波形整形を行う回路のオペレーショ
ナル・アンプを用いれば簡単に構成できることから、実
質追加する回路は減算回路部のみとなる。この減算回路
は電圧Ｖ、。ｔをツェナー電圧に選ぶことによりツェナ
・ダイオードを１本回路に直列に挿入することで構成す
ることが可能である。Furthermore, this circuit can be configured by simply adding an addition circuit section and a subtraction circuit section to the conventional circuit, and the addition circuit section is generally required between the conventional circuit after the IJItI flow section and the comparison section. Since it can be easily constructed by using an operational amplifier of a circuit that performs waveform shaping, the only additional circuit is the subtraction circuit section. This subtraction circuit has a voltage V,. By selecting t as the Zener voltage, it is possible to construct the circuit by inserting one Zener diode in series.
（１）過電流が第２種接地線に流れた際、フィルタ部が
飽和して正常な警報動作が維持できなくなることを補償
することができる。(1) It is possible to compensate for the fact that when an overcurrent flows through the second type grounding wire, the filter section is saturated and normal alarm operation cannot be maintained.
（２）注入用変圧器の注入電圧を一定に保つことが困難
となり正常な測定の維持ができなくなることを補償する
ことができる。(2) It is possible to compensate for the fact that it becomes difficult to keep the injection voltage of the injection transformer constant and normal measurement cannot be maintained.
（３）少ない部品点数で安価に警報発生信号を維持でき
る。(3) Alarm generation signals can be maintained at low cost with a small number of parts.
第１図（ａ）は本発明の動作原理図。 第１図（ｂ）は本発明の方法を実施するための回路図。 第２図は従来の絶縁抵抗測定装置の回路図。 FIG. 1(a) is a diagram showing the operating principle of the present invention. FIG. 1(b) is a circuit diagram for implementing the method of the present invention. FIG. 2 is a circuit diagram of a conventional insulation resistance measuring device.
Claims (1)
数と異なる測定用低周波信号電圧を加えるとともに、該
接地線に結合した変流器により該接地線に帰還する該測
定用低周波信号の漏洩電流成分を検出し、この漏洩電流
成分中絶縁抵抗に起因する成分を検出して得られる第１
の信号と、前記変流器により前記接地線に流れる商用周
波数漏洩電流を検出して前もって定められた漏洩電流値
以上で該漏洩電流に比例した出力を得る第２の信号を加
算し、警報設定値と比較して発生する信号を警報信号と
することを特徴とする絶縁劣化警報信号の発生方法。A low frequency signal voltage for measurement different from the commercial frequency of the electric line is applied to the ground wire of the transformer via an injection transformer, and the low frequency signal voltage for measurement is returned to the ground wire by a current transformer coupled to the ground wire. The first signal obtained by detecting the leakage current component of the signal and detecting the component caused by insulation resistance in this leakage current component.
and a second signal that detects a commercial frequency leakage current flowing in the grounding wire by the current transformer and obtains an output proportional to the leakage current at a predetermined leakage current value or more, and sets an alarm. A method for generating an insulation deterioration alarm signal, characterized in that a signal generated by comparison with a value is used as an alarm signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28109589A JPH03142380A (en) | 1989-10-28 | 1989-10-28 | Alarm signal generating method for insulation deterioration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28109589A JPH03142380A (en) | 1989-10-28 | 1989-10-28 | Alarm signal generating method for insulation deterioration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03142380A true JPH03142380A (en) | 1991-06-18 |
Family
ID=17634270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28109589A Pending JPH03142380A (en) | 1989-10-28 | 1989-10-28 | Alarm signal generating method for insulation deterioration |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03142380A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60139118A (en) * | 1983-12-26 | 1985-07-23 | 東洋通信機株式会社 | Method of generating insulation deterioration warning signal |
-
1989
- 1989-10-28 JP JP28109589A patent/JPH03142380A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60139118A (en) * | 1983-12-26 | 1985-07-23 | 東洋通信機株式会社 | Method of generating insulation deterioration warning signal |
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