JP2013195303A - Resistance measuring apparatus - Google Patents

Resistance measuring apparatus Download PDF

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JP2013195303A
JP2013195303A JP2012064365A JP2012064365A JP2013195303A JP 2013195303 A JP2013195303 A JP 2013195303A JP 2012064365 A JP2012064365 A JP 2012064365A JP 2012064365 A JP2012064365 A JP 2012064365A JP 2013195303 A JP2013195303 A JP 2013195303A
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coil
voltage
constant current
blocker
voltage detector
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Kazuhisa Yamashita
和久 山下
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ISHIMORI SEISAKUSHO KK
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ISHIMORI SEISAKUSHO KK
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Abstract

PROBLEM TO BE SOLVED: To provide a resistance measuring apparatus that can measure the direct current resistance of a test coil in a test piece used by being connected with an AC power source under a hotline condition and contributes to downsizing and cost reduction.SOLUTION: A resistance measuring apparatus 10 includes a DC constant current supplier 18 and a DC voltage detector 20. The DC constant current supplier 18 supplies a DC current to a test coil 16 via a secondary coil 30 of an AC block device 24 for a DC constant current supplier having the same number of turns as a primary coil 28 of the AC block device 24 for the DC constant current supplier and being installed so as to generate an AC voltage whose phase is opposite to that of the primary coil 28 by mutual induction. The DC voltage detector 20 detects a DC voltage across the test coil 16 via a secondary coil 36 of an AC block device 26 for the DC voltage detector having the same number of turns as the primary coil 34 of the AC block device 26 for the DC voltage detector and being installed so as to generate an AC voltage whose phase is opposite to that of the primary coil 34 by mutual induction.

Description

この発明は、交流電源に接続されて使用される被試験体内の被試験コイルの直流抵抗を活線状態で測定するための抵抗測定装置に関する。   The present invention relates to a resistance measuring apparatus for measuring a direct current resistance of a coil under test in a device under test used by being connected to an alternating current power supply in a live state.

従来、例えば交流モータや変圧器等の電気機器の内部温度の測定等のため、電気機器（被試験体）に交流電流を供給すると共に直流電流を重畳して供給し電気機器内の被試験コイルの抵抗を測定する手法が知られている（例えば、特許文献１、非特許文献１参照）。   Conventionally, for example, to measure the internal temperature of an electric device such as an AC motor or a transformer, an AC current is supplied to the electric device (test object) and a DC current is superimposed and supplied to the coil under test in the electric device. There is known a method for measuring the resistance (see, for example, Patent Document 1 and Non-Patent Document 1).

このような抵抗測定に用いられる抵抗測定装置は、交流電源に接続されて使用される被試験体の被試験コイルに直流電流を供給するための直流定電流供給器と、被試験コイルの両端の直流電圧を検出するための直流電圧検出器と、交流電源への直流電流の供給を阻止するための直流阻止用コンデンサと、直流定電流供給器への交流電流の流入を阻止するための直流定電流供給器用交流阻止器と、直流電圧検出器への交流電流の供給を阻止するための直流電圧検出器用交流阻止器と、を備えており、直流電圧検出器によって検出される電圧の値に基づいて被試験コイルの抵抗の値や温度が算出されるようになっている。   A resistance measuring apparatus used for such resistance measurement includes a DC constant current supply device for supplying a DC current to a coil under test of a device under test that is connected to an AC power source, and both ends of the coil under test. A DC voltage detector for detecting a DC voltage, a DC blocking capacitor for blocking the supply of DC current to the AC power supply, and a DC constant for blocking the inflow of AC current to the DC constant current supply An AC blocker for a current supply and an AC blocker for a DC voltage detector for blocking the supply of an AC current to the DC voltage detector, based on the value of the voltage detected by the DC voltage detector Thus, the resistance value and temperature of the coil under test are calculated.

特開昭４８−４０４８１号公報JP-A-48-40481

「ＪＩＳハンドブック２３−１ 電子III−１ 部品」、日本規格協会、２０１１年６月２０日第１版発行、１５０５頁、ＪＩＳ Ｃ−５３１１、図１１"JIS Handbook 23-1 Electronic III-1 Parts", Japanese Standards Association, June 20, 2011, 1st edition issued, page 1505, JIS C-5311, Fig. 11

しかしながら、直流定電流供給器用交流阻止器や直流電圧検出器用交流阻止器は例えばチョークコイル等のインピーダンスが高い素子を備えた複雑な構成であるため大型であると共に高コストであった。このため抵抗測定装置も大型で高コストなものとなっていた。   However, an AC blocker for a DC constant current supply device and an AC blocker for a DC voltage detector have a complicated structure including a high impedance element such as a choke coil, and thus are large and costly. For this reason, the resistance measuring apparatus is also large and expensive.

本発明はこのような問題に鑑みてなされたものであって、交流電源に接続されて使用される被試験体の被試験コイルの直流抵抗を活線状態で測定でき、コンパクト化やコスト低減に寄与する抵抗測定装置を提供することをその課題とする。   This invention is made in view of such a problem, Comprising: It can measure the direct current resistance of the to-be-tested coil of the to-be-tested object connected and connected to an alternating current power supply in a live state, and it is compact and reduces cost. It is an object of the present invention to provide a resistance measuring device that contributes.

本発明は、交流電源に接続されて使用される被試験体の被試験コイルに直流電流を供給するための直流定電流供給器と、被試験コイルの両端の直流電圧を検出するための直流電圧検出器と、交流電源への直流電流の供給を阻止するために交流電源と被試験コイルとの間に介在するように設置された直流阻止用コンデンサと、直流定電流供給器への交流電流の流入を阻止するための直流定電流供給器用交流阻止器と、直流電圧検出器への交流電流の供給を阻止するための直流電圧検出器用交流阻止器と、を備え、直流定電流供給器用交流阻止器は、交流電源の交流電圧が印加されるように直流阻止用コンデンサにおける交流電源が設置される側に設置された１次コイルと、１次コイルと巻数が等しく相互誘導によって１次コイルと逆相の交流電圧を生ずるように直流阻止用コンデンサにおける被試験コイルが設置される側に設置された２次コイルと、を有し、直流定電流供給器は直流定電流供給器用交流阻止器の２次コイルを介して被試験コイルに直流電流を供給するように設置され、直流電圧検出器用交流阻止器も、交流電源の交流電圧が印加されるように直流阻止用コンデンサにおける交流電源が設置される側に設置された１次コイルと、１次コイルと巻数が等しく相互誘導によって１次コイルと逆相の交流電圧を生ずるように直流阻止用コンデンサにおける被試験コイルが設置される側に設置された２次コイルと、を有し、直流電圧検出器は直流電圧検出器用交流阻止器の２次コイルを介して被試験コイルの両端の直流電圧を検出するように設置された抵抗測定装置により上記課題を解決したものである。   The present invention relates to a DC constant current supply device for supplying a DC current to a coil under test of a device under test that is connected to an AC power supply, and a DC voltage for detecting a DC voltage across the coil under test. A detector, a DC blocking capacitor installed so as to be interposed between the AC power source and the coil under test in order to block the supply of DC current to the AC power source, and the AC current to the DC constant current supply AC blocking device for DC constant current supply for blocking inflow and AC blocking device for DC voltage detector for blocking supply of AC current to DC voltage detector, AC blocking for DC constant current supply device The primary coil is installed on the side where the AC power supply is installed in the DC blocking capacitor so that the AC voltage of the AC power supply is applied, and the primary coil has the same number of turns as the primary coil and is opposite to the primary coil by mutual induction. AC power of phase And a secondary coil installed on the side of the DC blocking capacitor on the side where the coil under test is installed, and the DC constant current feeder is connected via the secondary coil of the AC blocker for the DC constant current supplier. The AC blocker for the DC voltage detector is also installed on the side where the AC power supply in the DC blocking capacitor is installed so that the AC voltage of the AC power supply is applied. And a secondary coil installed on the side of the DC blocking capacitor on which the coil to be tested is installed so as to generate an AC voltage having the same number of turns as the primary coil and a phase opposite to that of the primary coil by mutual induction. , And the DC voltage detector is connected to the resistance measuring device installed so as to detect the DC voltage at both ends of the coil under test via the secondary coil of the AC blocker for the DC voltage detector. It is obtained by solving the problem.

この抵抗測定装置は、１次コイルと巻数が等しく相互誘導によって１次コイルと逆相の交流電圧を生ずるように設置された直流定電流供給器用交流阻止器の２次コイルを介して被試験コイルに直流電流を供給するように直流定電流供給器が設置されているので直流定電流供給器は実質的に交流系から分離される。又、１次コイルと巻数が等しく相互誘導によって１次コイルと逆相の交流電圧を生ずるように設置された直流電圧検出器用交流阻止器の２次コイルを介して被試験コイルの両端の直流電圧を検出するように直流電圧検出器が設置されているので直流電圧検出器も実質的に交流系から分離される。直流定電流供給器用交流阻止器及び直流電圧検出器用交流阻止器はこのように巻数が等しい１次コイル及び２次コイルを備えた簡単な構成であり、チョークコイルのようなインピーダンスが高い大型の素子を必要としないのでコンパクト化やコスト低減に寄与する。   This resistance measuring device has a coil to be tested via a secondary coil of an AC blocker for a DC constant current supply, which has an equal number of turns to the primary coil and generates an AC voltage having a phase opposite to that of the primary coil by mutual induction. Since the DC constant current supply unit is installed so as to supply the DC current to the DC constant current supply unit, the DC constant current supply unit is substantially separated from the AC system. In addition, the DC voltage at both ends of the coil to be tested is passed through the secondary coil of the AC blocker for the DC voltage detector that is installed so that the number of turns is the same as that of the primary coil and an alternating voltage of the primary coil is generated by mutual induction. Since the DC voltage detector is installed so as to detect the DC voltage detector, the DC voltage detector is also substantially separated from the AC system. An AC blocker for a DC constant current supply and an AC blocker for a DC voltage detector have a simple configuration including a primary coil and a secondary coil having the same number of turns, and have a large impedance such as a choke coil. This contributes to downsizing and cost reduction.

本発明によれば、交流電源に接続されて使用される被試験体内の被試験コイルの直流抵抗を活線状態で測定でき、コンパクト化やコスト低減に寄与する抵抗測定装置を実現できる。   ADVANTAGE OF THE INVENTION According to this invention, the direct current resistance of the to-be-tested body in the to-be-tested body used by connecting with alternating current power supply can be measured in a live state, and the resistance measuring apparatus which contributes to size reduction and cost reduction is realizable.

本発明の第１実施形態に係る抵抗測定装置の要部構成を模式的に示す回路図The circuit diagram which shows typically the principal part structure of the resistance measuring apparatus which concerns on 1st Embodiment of this invention. 本発明の第２実施形態に係る抵抗測定装置の要部構成を模式的に示す回路図The circuit diagram which shows typically the principal part structure of the resistance measuring apparatus which concerns on 2nd Embodiment of this invention.

図１に示されるように本発明の第１実施形態に係る抵抗測定装置１０は、交流電源１２に接続されて使用される被試験体１４の被試験コイル１６に直流電流を供給するための直流定電流供給器１８と、被試験コイル１６の両端の直流電圧を検出するための直流電圧検出器２０と、交流電源１２への直流電流の供給を阻止するために交流電源１２と被試験コイル１６との間に介在するように設置された直流阻止用コンデンサ２２と、直流定電流供給器１８への交流電流の流入を阻止するための直流定電流供給器用交流阻止器２４と、直流電圧検出器２０への交流電流の供給を阻止するための直流電圧検出器用交流阻止器２６と、を備え、直流定電流供給器用交流阻止器２４及び直流電圧検出器用交流阻止器２６の構成に特徴を有している。他の構成については本第１実施形態の理解のために特に必要と思われないため説明を適宜省略する。   As shown in FIG. 1, a resistance measuring apparatus 10 according to the first embodiment of the present invention is a direct current for supplying a direct current to a coil under test 16 of a device under test 14 that is connected to an AC power supply 12 and used. A constant current supply 18, a DC voltage detector 20 for detecting a DC voltage across the coil under test 16, and an AC power supply 12 and a coil under test 16 for blocking the supply of DC current to the AC power supply 12. A DC blocking capacitor 22 installed so as to be interposed between the DC constant current supply unit 18, a DC constant current supply AC blocker 24 for blocking the flow of AC current to the DC constant current supply unit 18, and a DC voltage detector. And a DC voltage detector AC blocker 26 for blocking the supply of an AC current to 20, and is characterized by the configuration of the DC constant current supply AC blocker 24 and the DC voltage detector AC blocker 26. ing. Other configurations are not particularly necessary for the understanding of the first embodiment, and thus description thereof will be omitted as appropriate.

交流電源１２は抵抗測定装置１０の外部に備えられる電源であり、被試験体１４の被試験コイル１６の直流抵抗を測定する場合は抵抗測定装置１０を介して被試験体１４（の被試験コイル１６）に接続されるようになっている。交流電源１２の定格電圧は例えば１００Ｖ、２００Ｖ等である。   The AC power source 12 is a power source provided outside the resistance measuring device 10, and when measuring the DC resistance of the coil under test 16 of the device under test 14, the device under test 14 (the coil under test of the device under test 14 via the resistance measuring device 10). 16). The rated voltage of the AC power supply 12 is 100V, 200V, etc., for example.

被試験体１４は例えば交流モータ、変圧器等の交流電気機器である。被試験コイル１６のインダクタンスは例えば１０ｍＨ〜０．１Ｈである。   The DUT 14 is an AC electrical device such as an AC motor or a transformer. The inductance of the coil under test 16 is, for example, 10 mH to 0.1 H.

抵抗測定装置１０は、交流電源１２に接続される第１の外部接続端子４０及び第２の外部接続端子４２と、被試験体１４の被試験コイル１６に接続される第３の外部接続端子４４及び第４の外部接続端子４６と、を備えている。   The resistance measuring apparatus 10 includes a first external connection terminal 40 and a second external connection terminal 42 connected to the AC power supply 12, and a third external connection terminal 44 connected to the coil under test 16 of the device under test 14. And a fourth external connection terminal 46.

直流定電流供給器１８は一定の値の直流電流を供給するように構成されている。直流定電流供給器１８が供給する直流電流の値は例えば１〜１０ｍＡである。   The DC constant current supplier 18 is configured to supply a constant value of DC current. The value of the direct current supplied by the direct current constant current supply device 18 is, for example, 1 to 10 mA.

直流電圧検出器２０の測定範囲は例えば０〜１．９９Ｖである。   The measurement range of the DC voltage detector 20 is, for example, 0 to 1.99V.

直流阻止用コンデンサ２２は第１の外部接続端子４０と第３の外部接続端子４４との間に設置されている。直流阻止用コンデンサ２２の容量は例えば５００μＦ〜１．０Ｆである。   The DC blocking capacitor 22 is installed between the first external connection terminal 40 and the third external connection terminal 44. The capacity of the DC blocking capacitor 22 is, for example, 500 μF to 1.0 F.

直流定電流供給器用交流阻止器２４は、交流電源１２の交流電圧が印加されるように直流阻止用コンデンサ２２における交流電源１２が設置される側に設置された１次コイル２８と、１次コイル２８と巻数が等しく直流阻止用コンデンサ２２における被試験コイル１６が設置される側に１次コイル２８と逆相の交流電圧を生ずるように設置された２次コイル３０と、１次コイル２８及び２次コイル３０が巻回されたコア３２と、を有している。直流定電流供給器１８は直流定電流供給器用交流阻止器２４の２次コイル３０を介して被試験コイル１６に直流電流を供給するように設置されている。   The DC constant current supply AC blocker 24 includes a primary coil 28 and a primary coil installed on the side where the AC power supply 12 is installed in the DC blocking capacitor 22 so that the AC voltage of the AC power supply 12 is applied. 28, a secondary coil 30 installed so as to generate an AC voltage having a phase opposite to that of the primary coil 28 on the side of the DC blocking capacitor 22 where the coil 16 to be tested is installed, and the primary coils 28 and 2 And a core 32 around which the next coil 30 is wound. The DC constant current supply unit 18 is installed so as to supply a DC current to the coil under test 16 via the secondary coil 30 of the AC constant current supply AC blocker 24.

より詳細には、１次コイル２８は一端が第１の外部接続端子４０と直流阻止用コンデンサ２２との間に接続され他端が第２の外部接続端子４２と第４の外部接続端子４６との間に接続されている。又、２次コイル３０は一端が第３の外部接続端子４４と直流阻止用コンデンサ２２との間に接続され他端が直流定電流供給器１８の一端に接続されている。直流定電流供給器１８の他端は第２の外部接続端子４２と第４の外部接続端子４６との間に接続されている。   More specifically, the primary coil 28 has one end connected between the first external connection terminal 40 and the DC blocking capacitor 22, and the other end connected to the second external connection terminal 42 and the fourth external connection terminal 46. Connected between. The secondary coil 30 has one end connected between the third external connection terminal 44 and the DC blocking capacitor 22, and the other end connected to one end of the DC constant current supplier 18. The other end of the DC constant current supplier 18 is connected between the second external connection terminal 42 and the fourth external connection terminal 46.

直流電圧検出器用交流阻止器２６も、交流電源１２の交流電圧が印加されるように直流阻止用コンデンサ２２における交流電源１２が設置される側に設置された１次コイル３４と、１次コイル３４と巻数が等しく直流阻止用コンデンサ２２における被試験コイル１６が設置される側に１次コイル３４と逆相の交流電圧を生ずるように設置された２次コイル３６と、１次コイル３４及び２次コイル３６が巻回されたコア３８と、を有している。直流電圧検出器２０は直流電圧検出器用交流阻止器２６の２次コイル３６を介して被試験コイル１６の両端の直流電圧を検出するように設置されている。   The DC voltage detector AC blocker 26 also has a primary coil 34 and a primary coil 34 installed on the side where the AC power supply 12 is installed in the DC blocking capacitor 22 so that the AC voltage of the AC power supply 12 is applied. And a secondary coil 36 installed to generate an AC voltage having a phase opposite to that of the primary coil 34 on the side of the DC blocking capacitor 22 where the coil 16 to be tested is installed, and the primary coil 34 and the secondary coil. A core 38 around which the coil 36 is wound. The DC voltage detector 20 is installed so as to detect the DC voltage at both ends of the coil under test 16 via the secondary coil 36 of the AC blocker 26 for DC voltage detector.

より詳細には、直流電圧検出器用交流阻止器２６の１次コイル３４も一端が第１の外部接続端子４０と直流阻止用コンデンサ２２との間に接続され他端が第２の外部接続端子４２と第４の外部接続端子４６との間に接続されている。又、直流電圧検出器用交流阻止器２６の２次コイル３６も一端が第３の外部接続端子４４と直流阻止用コンデンサ２２との間に接続され他端は直流電圧検出器２０の一端に接続されている。直流電圧検出器２０の他端は第２の外部接続端子４２と第４の外部接続端子４６との間に接続されている。   More specifically, the primary coil 34 of the DC voltage detector AC blocker 26 has one end connected between the first external connection terminal 40 and the DC blocking capacitor 22 and the other end connected to the second external connection terminal 42. And the fourth external connection terminal 46. Also, the secondary coil 36 of the DC voltage detector AC blocker 26 has one end connected between the third external connection terminal 44 and the DC blocking capacitor 22 and the other end connected to one end of the DC voltage detector 20. ing. The other end of the DC voltage detector 20 is connected between the second external connection terminal 42 and the fourth external connection terminal 46.

又、抵抗測定装置１０は、直流電圧検出器２０によって測定される電圧の値に基づいて被試験コイル１６の直流抵抗や温度を算出するための算出部（図示省略）を更に備えている。抵抗測定装置１０が測定する被試験コイル１６の温度の範囲は例えば０〜２００．０℃である。尚、抵抗測定装置１０はパーソナルコンピュータやプリンターに接続可能な構成となっており、これらに測定結果を出力するようになっていてもよい。   The resistance measuring device 10 further includes a calculation unit (not shown) for calculating the DC resistance and temperature of the coil under test 16 based on the value of the voltage measured by the DC voltage detector 20. The temperature range of the coil under test 16 measured by the resistance measuring apparatus 10 is, for example, 0 to 200.0 ° C. The resistance measuring device 10 may be connected to a personal computer or a printer, and the measurement result may be output to them.

次に抵抗測定装置１０の作用について説明する。交流電源１２及び直流定電流供給器１８によって被試験コイル１６には交流電流が供給されると共に直流電流も重畳して供給され、直流電圧検出器２０によって被試験コイル１６の両端の直流電圧が測定される。この際、直流定電流供給器用交流阻止器２４の１次コイル２８には交流電源１２の交流電圧が印加され、２次コイル３０には１次コイル２８と逆相の交流電圧、即ち交流電源１２の交流電圧と逆相の交流電圧が生ずる。直流定電流供給器１８は、２次コイル３０及び直流阻止用コンデンサ２２を介して交流電源１２と接続されているので、２次コイル３０に交流電源１２の交流電圧と逆相の交流電圧が生ずることにより、交流電源１２の交流電圧は相殺される。従って、直流定電流供給器１８は実質的に交流系から分離される。又、直流電圧検出器用交流阻止器２６の１次コイル３４にも交流電源１２の交流電圧が印加され、直流電圧検出器用交流阻止器２６の２次コイル３６にも１次コイル３４と逆相の交流電圧、即ち交流電源１２の交流電圧と逆相の交流電圧が生ずる。直流電圧検出器２０は、２次コイル３６及び直流阻止用コンデンサ２２を介して交流電源１２と接続されているので、２次コイル３６に交流電源１２の交流電圧と逆相の交流電圧が生ずることにより、直流定電流供給器１８と同様に交流電源１２の交流電圧は相殺される。即ち、直流電圧検出器２０も実質的に交流系から分離される。   Next, the operation of the resistance measuring apparatus 10 will be described. An alternating current is supplied to the coil under test 16 by the alternating current power source 12 and a direct current constant current supply 18 and a direct current is also superimposed and supplied, and a direct current voltage detector 20 measures the direct current voltage across the coil under test 16. Is done. At this time, the AC voltage of the AC power supply 12 is applied to the primary coil 28 of the AC blocker 24 for the DC constant current supply device, and the AC voltage opposite to the primary coil 28, that is, the AC power supply 12 is applied to the secondary coil 30. An AC voltage having a phase opposite to that of the AC voltage is generated. Since the DC constant current supplier 18 is connected to the AC power supply 12 via the secondary coil 30 and the DC blocking capacitor 22, an AC voltage having a phase opposite to that of the AC power supply 12 is generated in the secondary coil 30. As a result, the AC voltage of the AC power supply 12 is canceled. Therefore, the DC constant current supplier 18 is substantially separated from the AC system. The AC voltage of the AC power supply 12 is also applied to the primary coil 34 of the DC voltage detector AC blocker 26, and the secondary coil 36 of the DC voltage detector AC blocker 26 has a phase opposite to that of the primary coil 34. An AC voltage, that is, an AC voltage having a phase opposite to that of the AC power supply 12 is generated. Since the DC voltage detector 20 is connected to the AC power supply 12 via the secondary coil 36 and the DC blocking capacitor 22, an AC voltage having a phase opposite to that of the AC power supply 12 is generated in the secondary coil 36. Thus, the AC voltage of the AC power supply 12 is canceled as in the DC constant current supplier 18. That is, the DC voltage detector 20 is also substantially separated from the AC system.

直流定電流供給器用交流阻止器２４も直流電圧検出器用交流阻止器２６も巻数が等しい１次コイル２８（３４）及び２次コイル３０（３６）を備えた簡単な構成であり、インピーダンスが高いチョークコイルのような大型の素子を必要としないのでコンパクト化やコスト低減に寄与する。   The DC constant current supply AC blocker 24 and the DC voltage detector AC blocker 26 both have a simple configuration including a primary coil 28 (34) and a secondary coil 30 (36) having the same number of turns, and have a high impedance choke. Since a large element such as a coil is not required, it contributes to downsizing and cost reduction.

尚、被試験コイル１６、直流定電流供給器用交流阻止器２４の２次コイル３０、直流電圧検出器用交流阻止器２６の２次コイル３６はいずれも直流阻止用コンデンサ２２を介して交流電源１２に接続されＬ−Ｃ直列回路を構成している。各コイルのインダクタンスをＬ、直流阻止用コンデンサ２２の容量をＣ、交流電源１２の周波数に対応する角速度をωとするとＬ−Ｃ直列回路のインピーダンスはωＬ−１／ωＣとなるが、１／ωＣがωＬよりも充分に小さければ実質的に直流阻止用コンデンサ２２の影響を無視することができ、直流定電流供給器用交流阻止器２４の２次コイル３０と直流定電流供給器１８の部分、及び直流電圧検出器用交流阻止器２６の２次コイル３６と直流電圧検出器２０の部分に交流電源１２によって印加される交流電圧を２次コイル３０、３６によって相殺できる。従って、１／ωＣがωＬよりも充分に小さくなるように直流阻止用コンデンサ２２の容量、直流定電流供給器用交流阻止器２４の２次コイル３０及び直流電圧検出器用交流阻止器２６の２次コイル３６のインダクタンスを選定することが好ましい。例えば、ω＝３１４ｒａｄ／ｓｅｃ（５０Ｈｚ）、Ｌ＝０．０１Ｈ（１０ｍＨ）、Ｃ＝５×１０−４Ｆ（５００μＦ）の場合、ωＬ＝３．１４、１／ωＣ＝６．４となるが、Ｌ＝０．１Ｈの場合はωＬ＝３１．４となる。又、Ｃ＝１．０Ｆの場合は１／ωＣ＝０．００３となる。 The coil under test 16, the secondary coil 30 of the DC constant current supply AC blocker 24, and the secondary coil 36 of the DC voltage detector AC blocker 26 are all connected to the AC power supply 12 via the DC blocking capacitor 22. Connected to form an L-C series circuit. When the inductance of each coil is L, the capacitance of the DC blocking capacitor 22 is C, and the angular velocity corresponding to the frequency of the AC power supply 12 is ω, the impedance of the LC series circuit is ωL-1 / ωC, but 1 / ωC Is sufficiently smaller than ωL, the influence of the DC blocking capacitor 22 can be substantially ignored, and the secondary coil 30 and the DC constant current supply 18 portion of the AC constant current supply AC blocker 24, and The AC voltage applied by the AC power supply 12 to the secondary coil 36 and the DC voltage detector 20 of the AC blocker 26 for DC voltage detector can be canceled by the secondary coils 30 and 36. Accordingly, the capacitance of the DC blocking capacitor 22, the secondary coil 30 of the DC constant current supply AC blocker 24, and the secondary coil of the DC voltage detector AC blocker 26 so that 1 / ωC is sufficiently smaller than ωL. Preferably, an inductance of 36 is selected. For example, when ω = 314 rad / sec (50 Hz), L = 0.01 H (10 mH), and C = 5 × 10 −4 F (500 μF), ωL = 3.14 and 1 / ωC = 6.4. When L = 0.1H, ωL = 31.4. When C = 1.0F, 1 / ωC = 0.003.

尚、被試験コイル１６の直流抵抗Ｒは次のように算出される。
Ｒ＝Ｅdc／Ｉdc
Ｅdc：直流電圧検出器２０によって測定される被試験コイル１６の直流電圧
Ｉdc：直流定電流供給器１８が供給する直流電流の値 The DC resistance R of the coil under test 16 is calculated as follows.
R = Edc / Idc
Edc: DC voltage of the coil under test 16 measured by the DC voltage detector 20: DC current value supplied by the DC constant current supplier 18

又、被試験コイル１６の温度は以下のように算出される。
Ｔ＝Ｔ０＋（Ｒ−Ｒ０）／αＲ０
Ｔ ：被試験コイル１６の温度測定時の温度
Ｔ０：被試験コイル１６の初期の温度
Ｒ ：被試験コイル１６の温度測定時の直流抵抗
Ｒ０：被試験コイル１６の初期の直流抵抗
α ：被試験コイル１６の材料の温度係数 The temperature of the coil under test 16 is calculated as follows.
T = T 0 + (R−R 0 ) / αR 0
T: Temperature when measuring the temperature of the coil under test 16 T 0 : Initial temperature of the coil under test 16 R: DC resistance when measuring the temperature of the coil under test R 0 : Initial DC resistance α of the coil under test 16: Temperature coefficient of material of coil under test 16

次に、本発明の第２実施形態について説明する。前記第１実施形態に係る抵抗測定装置１０では直流定電流供給器用交流阻止器２４が１次コイル２８及び２次コイル３０を備え、直流電圧検出器用交流阻止器２６も１次コイル３４及び２次コイル３６を備えていたのに対し、本第２実施形態に係る抵抗測定装置５０は、直流定電流供給器用交流阻止器５２及び直流電圧検出器用交流阻止器５４が１つの１次コイル２８を共有する構成であることを特徴としている。尚、直流定電流供給器用交流阻止器５２及び直流電圧検出器用交流阻止器５４はコア５６も共有している。一方、２次コイル３０、３６は共有されていない。他の構成については前記第１実施形態に係る抵抗測定装置１０と同様であるので同様の構成については図１と同一符号を付することとして説明を適宜省略する。   Next, a second embodiment of the present invention will be described. In the resistance measuring device 10 according to the first embodiment, the AC constant current supply AC blocker 24 includes the primary coil 28 and the secondary coil 30, and the DC voltage detector AC blocker 26 is also the primary coil 34 and the secondary coil 30. Whereas the resistance measuring device 50 according to the second embodiment is provided with the coil 36, the DC constant current supply AC blocker 52 and the DC voltage detector AC blocker 54 share one primary coil 28. It is the structure which carries out. The DC constant current supply AC blocker 52 and the DC voltage detector AC blocker 54 also share the core 56. On the other hand, the secondary coils 30 and 36 are not shared. Since other configurations are the same as those of the resistance measuring apparatus 10 according to the first embodiment, the same configurations as those in FIG.

このように直流定電流供給器用交流阻止器５２及び直流電圧検出器用交流阻止器５４が１次コイル２８やコア５６を共有することで更なるコンパクト化やコスト低減が可能である。   As described above, the DC constant current supply AC blocker 52 and the DC voltage detector AC blocker 54 share the primary coil 28 and the core 56, thereby further reducing the size and cost.

本発明は、交流電源に接続されて使用される例えば交流モータや変圧器等の被試験体内の被試験コイルの直流抵抗を活線状態で測定するための抵抗測定装置に利用できる。   INDUSTRIAL APPLICABILITY The present invention can be used in a resistance measuring apparatus for measuring the direct current resistance of a coil under test in a device under test such as an AC motor or a transformer that is used by being connected to an AC power supply.

１０、５０…抵抗測定装置
１２…交流電源
１４…被試験体
１６…被試験コイル
１８…直流定電流供給器
２０…直流電圧検出器
２２…直流阻止用コンデンサ
２４、５２…直流定電流供給器用交流阻止器
２６、５４…直流電圧検出器用交流阻止器
２８、３４…１次コイル
３０、３６…２次コイル
３２、３８、５６…コア
４０…第１の外部接続端子
４２…第２の外部接続端子
４４…第３の外部接続端子
４６…第４の外部接続端子 DESCRIPTION OF SYMBOLS 10, 50 ... Resistance measuring apparatus 12 ... AC power source 14 ... DUT 16 ... Coil 18 ... DC constant current supply 20 ... DC voltage detector 22 ... DC blocking capacitor 24, 52 ... AC for DC constant current supply Blocker 26, 54 ... AC blocker for DC voltage detector 28, 34 ... Primary coil 30, 36 ... Secondary coil 32, 38, 56 ... Core 40 ... First external connection terminal 42 ... Second external connection terminal 44 ... Third external connection terminal 46 ... Fourth external connection terminal

Claims (2)

交流電源に接続されて使用される被試験体の被試験コイルに直流電流を供給するための直流定電流供給器と、
前記被試験コイルの両端の直流電圧を検出するための直流電圧検出器と、
前記交流電源への直流電流の供給を阻止するために前記交流電源と前記被試験コイルとの間に介在するように設置された直流阻止用コンデンサと、
前記直流定電流供給器への交流電流の流入を阻止するための直流定電流供給器用交流阻止器と、
前記直流電圧検出器への交流電流の供給を阻止するための直流電圧検出器用交流阻止器と、を備え、
前記直流定電流供給器用交流阻止器は、前記交流電源の交流電圧が印加されるように前記直流阻止用コンデンサにおける前記交流電源が設置される側に設置された１次コイルと、前記１次コイルと巻数が等しく相互誘導によって前記１次コイルと逆相の交流電圧を生ずるように前記直流阻止用コンデンサにおける前記被試験コイルが設置される側に設置された２次コイルと、を有し、前記直流定電流供給器は前記直流定電流供給器用交流阻止器の２次コイルを介して前記被試験コイルに直流電流を供給するように設置され、
前記直流電圧検出器用交流阻止器も、前記交流電源の交流電圧が印加されるように前記直流阻止用コンデンサにおける前記交流電源が設置される側に設置された１次コイルと、前記１次コイルと巻数が等しく相互誘導によって前記１次コイルと逆相の交流電圧を生ずるように前記直流阻止用コンデンサにおける前記被試験コイルが設置される側に設置された２次コイルと、を有し、前記直流電圧検出器は前記直流電圧検出器用交流阻止器の２次コイルを介して前記被試験コイルの両端の直流電圧を検出するように設置されたことを特徴とする抵抗測定装置。 A DC constant current supply for supplying a DC current to a coil under test of a device under test that is connected to an AC power source; and
A DC voltage detector for detecting a DC voltage across the coil under test;
A DC blocking capacitor installed so as to be interposed between the AC power supply and the coil under test in order to block the supply of a DC current to the AC power supply;
An AC blocker for a DC constant current supply for blocking the flow of AC current to the DC constant current supply;
An AC blocker for a DC voltage detector for blocking the supply of AC current to the DC voltage detector,
The DC constant current supply AC blocker includes a primary coil installed on the side where the AC power supply is installed in the DC blocking capacitor so that an AC voltage of the AC power supply is applied, and the primary coil And a secondary coil installed on the side where the coil to be tested is installed in the DC blocking capacitor so as to generate an AC voltage having the same number of turns and a reverse phase with the primary coil by mutual induction, and A DC constant current supply device is installed so as to supply a DC current to the coil under test via a secondary coil of the AC constant current supply AC blocker.
The DC voltage detector AC blocker also includes a primary coil installed on the side where the AC power supply is installed in the DC blocking capacitor so that an AC voltage of the AC power supply is applied, and the primary coil, A secondary coil installed on the side of the DC blocking capacitor on which the coil to be tested is installed so as to generate an AC voltage having the same number of turns and a phase opposite to that of the primary coil by mutual induction. A resistance measuring apparatus, wherein the voltage detector is installed so as to detect a DC voltage across the coil under test via a secondary coil of the AC blocker for the DC voltage detector. 請求項１において、
前記直流定電流供給器用交流阻止器及び前記直流電圧検出器用交流阻止器が前記１次コイルを共有する構成であることを特徴とする抵抗測定装置。 In claim 1,
The resistance measuring apparatus, wherein the DC constant current supply AC blocker and the DC voltage detector AC blocker share the primary coil.
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CN104714099A (en) * 2015-04-15 2015-06-17 王永顺 Method for over-speed measurement of direct-current resistance of large power transformer
CN105067890A (en) * 2015-07-14 2015-11-18 东营市双益电气有限责任公司 Method for measuring transformer DC resistance by utilizing zero flux method and measuring system thereof
CN105807217A (en) * 2016-03-14 2016-07-27 国网浙江宁波市鄞州区供电公司 Transformer direct-current resistance and on-load tap-changer integrated tester
CN109470926A (en) * 2018-03-02 2019-03-15 国网浙江省电力公司嘉兴供电公司 A kind of cable direct current resistance m easurem ent device and its application method
CN110850171A (en) * 2019-11-29 2020-02-28 国网山东省电力公司青岛供电公司 Evaluation method for DC resistance qualification degree of voltage regulating transformer
AT524529A1 (en) * 2020-12-03 2022-06-15 Omicron Electronics Gmbh Determining a resistance of a transformer winding

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104714099A (en) * 2015-04-15 2015-06-17 王永顺 Method for over-speed measurement of direct-current resistance of large power transformer
CN105067890A (en) * 2015-07-14 2015-11-18 东营市双益电气有限责任公司 Method for measuring transformer DC resistance by utilizing zero flux method and measuring system thereof
CN105807217A (en) * 2016-03-14 2016-07-27 国网浙江宁波市鄞州区供电公司 Transformer direct-current resistance and on-load tap-changer integrated tester
CN109470926A (en) * 2018-03-02 2019-03-15 国网浙江省电力公司嘉兴供电公司 A kind of cable direct current resistance m easurem ent device and its application method
CN110850171A (en) * 2019-11-29 2020-02-28 国网山东省电力公司青岛供电公司 Evaluation method for DC resistance qualification degree of voltage regulating transformer
CN110850171B (en) * 2019-11-29 2021-09-17 国网山东省电力公司青岛供电公司 Evaluation method for DC resistance qualification degree of voltage regulating transformer
AT524529A1 (en) * 2020-12-03 2022-06-15 Omicron Electronics Gmbh Determining a resistance of a transformer winding

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