JPH0545983Y2 - - Google Patents
Info
- Publication number
- JPH0545983Y2 JPH0545983Y2 JP1987059050U JP5905087U JPH0545983Y2 JP H0545983 Y2 JPH0545983 Y2 JP H0545983Y2 JP 1987059050 U JP1987059050 U JP 1987059050U JP 5905087 U JP5905087 U JP 5905087U JP H0545983 Y2 JPH0545983 Y2 JP H0545983Y2
- Authority
- JP
- Japan
- Prior art keywords
- harmonic current
- capacitor
- overload rate
- value
- ammeter
- 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
Links
- 239000003990 capacitor Substances 0.000 claims description 32
- 238000012360 testing method Methods 0.000 claims description 13
- 238000005259 measurement Methods 0.000 description 10
- 239000002131 composite material Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
Landscapes
- Protection Of Static Devices (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Description
【考案の詳細な説明】
［産業上の利用分野］
この考案は、進相コンデンサに流入する高調波
電流によるコンデンサの過負荷率を測定する高調
波電流過負荷率計に関する。[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a harmonic current overload rate meter that measures the overload rate of a capacitor due to harmonic current flowing into a phase advance capacitor.
［従来方法と問題点］
現在、一般需要家においてインバータなど高調
波電流を多く発生する負荷が使用されながら、力
率改善用の低圧進相である被試験コンデンサに
は、高調波電流抑制用の直列リアクトルは設置さ
れていないのが現状である。そのために、高調波
電流による負荷の焼損事故等が多く、その一因で
あるコンデンサへ流入する高調波電流を正確に測
定するには、第３図に示すように比較的大がかり
な装置と時間を要するため、測定はほとんど行な
われていない。[Conventional methods and problems] Currently, general consumers use loads that generate a lot of harmonic current, such as inverters, but the capacitor under test, which is a low-voltage phase advance for power factor correction, is equipped with a capacitor for suppressing harmonic current. Currently, no series reactor is installed. For this reason, there are many accidents such as burnout of loads due to harmonic current, and in order to accurately measure the harmonic current flowing into the capacitor, which is one of the causes, it requires relatively large-scale equipment and time, as shown in Figure 3. Because of the necessity, very few measurements have been made.
従来の測定方法では、第３図に示すようにコン
デンサ電流を変流器CTで検出し、高調波電流測
定器（スペクトラムアナライザー）１、XYプロ
ツター２などでその含有率を求め、過負荷率を算
出していたが、変流器CTを設置するための回路
一時切りはなし作業や、スペクトラムアナライザ
ー１へ入力するためにトランジユーサ３他の結線
など装置が比較的大がかりとなり、測定に要する
時間も長くかかり、また測定装置の操作が複雑
で、一般の人が容易に扱えるものではなく、測定
には高度な技術を要していた。 In the conventional measurement method, as shown in Figure 3, the capacitor current is detected by a current transformer CT, the content rate is determined by a harmonic current measuring device (spectrum analyzer) 1, an XY plotter 2, etc., and the overload rate is determined. However, it required a relatively large amount of equipment, such as temporarily disconnecting the circuit to install the current transformer CT, and connecting the transistor 3 and other wires to input to the spectrum analyzer 1, and the time required for measurement was also long. In addition, the measurement equipment was complicated to operate and could not be easily handled by ordinary people, and measurement required advanced technology.
［考案の目的］
この考案は、上記の点を解消するためになされ
たもので、流入する高調波電流による被試験コン
デンサの過負荷率を、被試験コンデンサの端子電
圧を測定すねだけで簡単に求めることができる。
携帯可能で経済的な測定器を提供するものであ
る。[Purpose of the invention] This invention was made to solve the above problem, and it is possible to easily measure the overload rate of the capacitor under test due to inflowing harmonic current by simply measuring the terminal voltage of the capacitor under test. You can ask for it.
It provides a portable and economical measuring instrument.
［考案の構成］
この考案の構成を第１図により説明する。第１
図において、４は高調波電流過負荷率計、XCは
固定コンデンサ、５は熱動実効値形電流計、６は
整流実効値形電圧計、７は測定端子、８は被試験
コンデンサである。[Structure of the invention] The structure of this invention will be explained with reference to FIG. 1st
In the figure, 4 is a harmonic current overload rate meter, XC is a fixed capacitor, 5 is a thermal effective value type ammeter, 6 is a rectified effective value type voltmeter, 7 is a measurement terminal, and 8 is a capacitor to be tested.
測定の実施例を第２図により説明する。第２図
において、８は被試験コンデンサ、４は高調波電
流過負荷率計、XCはダミー標準コンデンサとな
る固定コンデンサ、IAは低圧進相である被試験
８コンデンサに流れる高調波を含んだ合成電流、
ICはダミー標準コンデンサである固定コンデン
サXCに流れる高調波電流を含んだ合成電流、
AMは熱動実効値形電流計５の指示値で、高調波
電流を含んだ合成電流、VMは整流実効値形電圧
計６の指示値で高調波電流を含んだ合成電圧、
I60は基本波電流、INは高調波電流の合成電流、
VNは高調波電圧の合成電圧、Ｎは高調波次数、
XC60は基本波インピーダンス（固定コンデン
サ）、V60は基本波電圧である。 An example of measurement will be explained with reference to FIG. In Figure 2, 8 is the capacitor under test, 4 is a harmonic current overload rate meter, XC is a fixed capacitor that becomes a dummy standard capacitor, and IA is a combination including harmonics flowing through the 8 capacitors under test, which are low voltage phase advance. current,
IC is a composite current including harmonic current flowing through fixed capacitor XC, which is a dummy standard capacitor.
AM is the indicated value of the thermal effective value type ammeter 5, a composite current including harmonic current, VM is the indicated value of the rectified effective value type voltmeter 6, a composite voltage including harmonic current,
I 60 is the fundamental current, IN is the composite current of the harmonic current,
VN is the composite voltage of harmonic voltages, N is the harmonic order,
XC 60 is the fundamental impedance (fixed capacitor) and V 60 is the fundamental voltage.
例えば、第Ｎ次高調波電圧を含んだ合成電圧
VNに第５次高調波電圧が10％含まれている場合
には、整流実効値形電圧計６の指示値VMは
VM＝√12＋0.12＝1.005になるため
V60＝VNとなり、
整流実効値形電圧計６の指示値VMには、基本波
電圧V60の値が大略表示される。 For example, a composite voltage including the Nth harmonic voltage
If VN contains 10% of the fifth harmonic voltage, the indicated value VM of the rectified effective value type voltmeter 6 will be VM = √1 2 +0.1 2 = 1.005, so V 60 = VN. , The indicated value VM of the rectified effective value type voltmeter 6 approximately displays the value of the fundamental wave voltage V 60 .
高調波電流の過負荷率は、IC／I60であるから となる。 Since the harmonic current overload factor is IC/I 60 becomes.
従つて、電流計５の指示値AMを
または、IC・XC60で目盛り、その指示値を電
圧計６の指示値VMで割り、100を乗ずると次式
のように被試験コンデンサ８の過負荷率（％）が
求められる。 Therefore, the reading value AM of ammeter 5 is Or, by dividing the indicated value by the indicated value VM of the voltmeter 6 and multiplying by 100, the overload rate (%) of the capacitor under test 8 can be obtained as shown in the following formula.
被試験コンデンサ８に流れる高調波電流過負荷
率は、
IC／I60＝AM（電流計５の指示値）／VM（電圧計６の
指示値）
となり、上式は百分率（％）で表示される。 The harmonic current overload rate flowing through the capacitor under test 8 is IC/I 60 = AM (indication value of ammeter 5)/VM (indication value of voltmeter 6), and the above formula is expressed as a percentage (%). Ru.
この実施例では、高調波電流過負荷率計を４測
定端子７を直接被試験コンデンサ８回路に接続し
て測定する場合について述べたが、高圧回路に接
続されているコンデンサで直接接続して測定でき
ない場合でも、計器用変成器を介してこの考案の
高調波電流過負荷率計４の測定端子７を計器用変
成器の低圧側端子に接続すれば、この考案の原理
にもとづき、コンデンサの過負荷率を測定でき
る。 In this example, we have described the case where the harmonic current overload factor meter is measured by connecting the 4 measurement terminals 7 directly to the 8 circuits of capacitors under test. Even if this is not possible, if the measurement terminal 7 of the harmonic current overload rate meter 4 of this invention is connected to the low voltage side terminal of the instrument transformer via the instrument transformer, the overload of the capacitor can be detected based on the principle of this invention. Load factor can be measured.
［考案の効果］
この考案によれば、携帯用の高調波電流過負荷
率計４に設けられた測定端子７で被試験コンデン
サ８の端子電圧を測定することによつて、誰でも
簡単・容易に過負荷率を測定することができ、精
度も実用上過負荷率の判定に支障がない程度の誤
差範囲であり小形で低廉な高調波電流過負荷率計
４を提供することができるので、被試験／コンデ
ンサ８の高調波電流による過負荷による焼損事故
を未然に防ぐことができる。[Effects of the invention] According to this invention, anyone can easily and easily measure the terminal voltage of the capacitor under test 8 with the measurement terminal 7 provided on the portable harmonic current overload rate meter 4. It is possible to provide a small and inexpensive harmonic current overload rate meter 4 that can measure the overload rate, has an accuracy within an error range that does not impede the determination of the overload rate in practical use, Burnout accidents due to overload caused by harmonic current of the capacitor 8 under test can be prevented.
第１図は、この考案による高調波電流過負荷率
計の説明図、第２図は、この考案の高調波電流過
負荷率計を用い被試験コンデンサの過負荷率を測
定する実施例の説明図、第３図は、従来の高調波
電流過負荷率の測定回路の概略図である。
１……高調波電流測定器、２……XYプロツタ
ー、３……トランスジユーサ、４……高調波電流
過負荷率計、５……電流計、６……電圧計、７…
…測定端子、８……被試験コンデンサ、XC……
固定コンデンサ、AM……電流計５の指示値で高
調波電流を含んだ合成電流、VM……電圧計６の
指示値で高調波電圧を含んだ合成電圧。
Figure 1 is an explanatory diagram of the harmonic current overload rate meter of this invention, and Figure 2 is an explanation of an example of measuring the overload rate of a capacitor under test using the harmonic current overload rate meter of this invention. FIG. 3 is a schematic diagram of a conventional harmonic current overload rate measuring circuit. 1...Harmonic current measuring device, 2...XY plotter, 3...Transducer, 4...Harmonic current overload rate meter, 5...Ammeter, 6...Voltmeter, 7...
...Measurement terminal, 8...Capacitor under test, XC...
Fixed capacitor, AM...Composite current including harmonic current as indicated by ammeter 5, VM...Composite voltage including harmonic voltage as indicated by voltmeter 6.
Claims (1)
て、コンデンサに流入する高調波電流を含んだ
電流を分流させるダミーコンデンサ回路と、そ
の分流した電流を測定する電流計と、被試験コ
ンデンサの回路電圧を測定する電圧計を具備し
た高調波電流過負荷率計。 (2) 電流計は熱動実効値形である実用新案登録請
求の範囲第１項に記載の高調波電流過負荷率
計。 (3) 電圧計、は整流実効値形である実用新案登録
請求の範囲第１項に記載の高調波電流過負荷率
計。 (4) 電流計の目盛値は、分流用コンデンサのイン
ピーダンス値に分流用コンデンサに流れる電流
値を乗じた値に目盛つておき、 電流計の指示値／電圧計の指示値×100（％）で過負
荷率を算 出する、実用新案登録請求の範囲第１項、第２
項、第３項に記載の高調波電流過負荷率計。[Scope of Claim for Utility Model Registration] (1) In a capacitor circuit containing harmonic current, a dummy capacitor circuit that shunts the current containing harmonic current flowing into the capacitor, and an ammeter that measures the shunted current. , a harmonic current overload rate meter equipped with a voltmeter to measure the circuit voltage of the capacitor under test. (2) The harmonic current overload rate meter according to claim 1 of the utility model registration claim, wherein the ammeter is of a thermal effective value type. (3) The harmonic current overload rate meter according to claim 1 of the utility model registration claim, wherein the voltmeter is a rectified effective value type. (4) The scale value of the ammeter should be set to the value obtained by multiplying the impedance value of the shunt capacitor by the current value flowing through the shunt capacitor, and calculate the reading value of the ammeter/the reading value of the voltmeter x 100 (%). Scope of utility model registration claims, paragraphs 1 and 2, which calculate the overload rate
3. The harmonic current overload rate meter according to item 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987059050U JPH0545983Y2 (en) | 1987-04-17 | 1987-04-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987059050U JPH0545983Y2 (en) | 1987-04-17 | 1987-04-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63165581U JPS63165581U (en) | 1988-10-27 |
| JPH0545983Y2 true JPH0545983Y2 (en) | 1993-11-30 |
Family
ID=30890183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987059050U Expired - Lifetime JPH0545983Y2 (en) | 1987-04-17 | 1987-04-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0545983Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS573522A (en) * | 1980-06-03 | 1982-01-09 | Denriyoku Chuo Kenkyusho | Harmonic wave monitor |
-
1987
- 1987-04-17 JP JP1987059050U patent/JPH0545983Y2/ja not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS573522A (en) * | 1980-06-03 | 1982-01-09 | Denriyoku Chuo Kenkyusho | Harmonic wave monitor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63165581U (en) | 1988-10-27 |
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