JP6547217B2 - Capacitor-type instrument transformer for transient overvoltage monitoring system - Google Patents

Capacitor-type instrument transformer for transient overvoltage monitoring system Download PDF

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JP6547217B2
JP6547217B2 JP2017564669A JP2017564669A JP6547217B2 JP 6547217 B2 JP6547217 B2 JP 6547217B2 JP 2017564669 A JP2017564669 A JP 2017564669A JP 2017564669 A JP2017564669 A JP 2017564669A JP 6547217 B2 JP6547217 B2 JP 6547217B2
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capacitor
voltage
type instrument
instrument transformer
transient overvoltage
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JP2018532249A (en
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儉 鄒
儉 鄒
洪波 叶
洪波 叶
駿 李
駿 李
▲はん▼ 金
▲はん▼ 金
文栄 司
文栄 司
文彬 趙
文彬 趙
丹丹 趙
丹丹 趙
行星 周
行星 周
華 黄
華 黄
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State Grid Shanghai Electric Power Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/04—Voltage dividers
    • G01R15/06—Voltage dividers having reactive components, e.g. capacitive transformer
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Description

本開示は電気工学分野に関し、たとえば過渡過電圧監視システム用のコンデンサ形計器用変圧器に関する。   The present disclosure relates to the field of electrical engineering, for example, a capacitor-type instrument transformer for a transient overvoltage monitoring system.

送電網過渡過程は送電網運転状態における重要な特徴であり、送電網における過渡過電圧（動作過電圧、直流送電システムによる一時的な過電圧、電圧不足）については、国内外においての有効な測定・監視手段が欠如している。新設装置において、中国では、５００ｋＶシステムの正式な運営前に、動作過電圧をテストする電力会社は一部しかない。一般的には、無負荷回線、主変圧器、低電圧リアクトル又はコンデンサをスイッチングする時に、過渡測定を、新装置の荷電評価として行う。   The grid transition process is an important feature in the grid operation state, and effective measures and monitoring means at home and abroad for transient overvoltages in the grid (operating overvoltage, temporary overvoltage due to the DC transmission system, voltage shortage). Is lacking. In the new equipment, in China, there are only a few power companies that test the operation overvoltage before the formal operation of the 500 kV system. In general, when switching a no-load line, a main transformer, a low voltage reactor or a capacitor, transient measurement is performed as charge evaluation of the new device.

運転中の装置において、通常の保護及びオシログラフ装置は商用周波過電圧情報のみしか記録できず、システムの過渡過程を記録できない。スケジューリング部門に既に使用されている監視システム、インテリジェント監視・早期警報システム及び送電網広域リアルタイム動的監視システムは主に送電網全体の動的安定性と静的安定性から、送電網運転の特徴量をリアルタイムにモニタリングし、更に未来の時点での送電網の安定状態を予測するものであり、サンプリング周波数は高いが、一次信号がコンデンサ形計器用変圧器（ｃａｐａｃｉｔｏｒ ｖｏｌｔａｇｅ ｔｒａｎｓｆｏｒｍｅｒ、ＣＶＴ）の強磁性ユニットの後に収集されるため、高周波信号が大幅にゆがみ、システムにおける電圧の迅速な変化過程を本格的に示すことができず、電力システムの運転状態を全面的に監視することも実現できない。   In the device in operation, the normal protection and oscillographic device can only record commercial frequency over voltage information and can not record the transient process of the system. The monitoring system, intelligent monitoring and early warning system, and grid wide-area real-time dynamic monitoring system, which are already used in the scheduling department, are mainly characterized by the dynamic stability and static stability of the whole grid, and they are features of grid operation. Monitoring the real-time status of the transmission network and predicting the steady state of the transmission network in the future, and the sampling frequency is high, but the primary signal is a ferromagnetic unit of a capacitor voltage transformer (CVT). The high frequency signal is distorted significantly and can not show the rapid change process of the voltage in the system in full scale, and it can not be realized to fully monitor the operating condition of the power system.

過渡過電圧監視システム用のコンデンサ形計器用変圧器は、交流・直流ハイブリッド送電網とインテリジェント送電網の情報化による機能の要求を満たすことを目的とし、過電圧と絶縁の複合技術の発展に合致する新型電気装置である。   Capacitor-type instrument transformers for transient over-voltage monitoring systems are new types to meet the development of combined over-voltage and insulation technologies, with the aim of meeting the functional requirements of the AC / DC hybrid transmission network and the intelligent transmission network. It is an electrical device.

本開示は、動作周波数が高く、測定データの精度が高く、適用範囲が広い過渡過電圧監視システム用のコンデンサ形計器用変圧器を提供する。   The present disclosure provides a capacitor-type instrument transformer for a transient overvoltage monitoring system that has a high operating frequency, high accuracy of measurement data, and a wide range of applications.

本開示は、第１のコンデンサ、第２のコンデンサ、第３のコンデンサ、過渡過電圧監視ユニット、中間変圧器、接地ナイフスイッチ、補償リアクトル、及び第１の避雷器を備え、前記第１のコンデンサは、一端が送電網に接続され、他端が第２のコンデンサの一端と中間変圧器における一次巻線の一端にそれぞれ接続され、前記第２のコンデンサの他端は過渡過電圧監視ユニットの一端と補償リアクトルの一端にそれぞれ接続され、前記中間変圧器における一次巻線の他端は補償リアクトルの他端と第１の避雷器の一端にそれぞれ接続され、前記過渡過電圧監視ユニットの他端と第１の避雷器の他端はいずれも接地し、前記接地ナイフスイッチは過渡過電圧監視ユニットの両端に並列接続され、前記第３のコンデンサは、一端が前記第２のコンデンサの他端に接続されて、他端が接地し、前記第１のコンデンサの耐電圧が前記第２のコンデンサの耐電圧より大きく、前記第２のコンデンサの耐電圧が前記第３のコンデンサの耐電圧より大きい、過渡過電圧監視システム用のコンデンサ形計器用変圧器を提供する。   The present disclosure includes a first capacitor, a second capacitor, a third capacitor, a transient overvoltage monitoring unit, an intermediate transformer, a ground knife switch, a compensation reactor, and a first lightning arrester, the first capacitor being One end is connected to the power transmission network, the other end is connected to one end of the second capacitor and one end of the primary winding in the intermediate transformer, and the other end of the second capacitor is one end of the transient overvoltage monitoring unit and the compensation reactor The other end of the primary winding in the intermediate transformer is connected to the other end of the compensation reactor and one end of the first lightning arrester, and the other end of the transient overvoltage monitoring unit and the first arrester The other end is grounded and the ground knife switch is connected in parallel to both ends of the transient overvoltage monitoring unit, and the third capacitor has one end connected to the second core. The other end of the capacitor is connected to the other end, the other end is grounded, the withstand voltage of the first capacitor is larger than the withstand voltage of the second capacitor, and the withstand voltage of the second capacitor is that of the third capacitor. Provided is a capacitor-type instrument transformer for a transient over voltage monitoring system which is larger than the withstand voltage.

好ましくは、過渡過電圧監視ユニットの両端に並列接続される第２の避雷器をさらに備
える。 Preferably, a second lightning arrester connected in parallel across the transient overvoltage monitoring unit is further provided.

好ましくは、前記補償リアクトルはリアクタンス値を調整可能な抵抗である。   Preferably, the compensation reactor is a resistor capable of adjusting a reactance value.

好ましくは、中間変圧器における二次巻線に設けられるダンパをさらに備える。   Preferably, it further comprises a damper provided on a secondary winding in the intermediate transformer.

好ましくは、過渡過電圧監視ユニットの両端に並列接続される保護隙間をさらに備える。   Preferably, there is further provided a protective gap connected in parallel to both ends of the transient overvoltage monitoring unit.

関連技術に比べて、本開示に係る過渡過電圧監視システム用のコンデンサ形計器用変圧器には、以下の利点がある。   Compared to the related art, the capacitor-type instrument transformer for a transient overvoltage monitoring system according to the present disclosure has the following advantages.

１）高動作周波数、測定データの高精度
通常のコンデンサ形計器用変圧器の、たとえば電圧計量及びリレー保護機能を有するとともに、高電圧及び超高電圧送電網における高調波を測定したり、送電網電圧波形をリアルタイムに観測して測定したりすることもできる。第１の避雷器と第２の避雷器を設置することによって、過電圧に起因する破損を防止し、過渡過電圧監視ユニットを保護することができ、過渡過電圧監視システムにおいて５００ｋＶ送電回線過電圧と結合するためのセンサとすることもできる。 1) High operating frequency, high accuracy of measurement data For example, while having voltage metering and relay protection function of a normal capacitor type instrument transformer, measuring harmonics in high voltage and ultra high voltage transmission network, transmission network The voltage waveform can also be observed and measured in real time. By installing the first lightning arrester and the second lightning arrester, it is possible to prevent damage due to overvoltage and protect the transient overvoltage monitoring unit, and a sensor for coupling with 500 kV transmission line overvoltage in the transient overvoltage monitoring system It can also be done.

２）高動作安定性
常設型室外装置の設計アイデアを用いるため、本開示で示されるＣＶＴは、一時的な施設や対策でなく、送電網において長期的に動作できる装置である。 2) High operation stability In order to use the design idea of a permanent installation type outdoor device, CVT shown by this indication is not a temporary facility or measures, and is an apparatus which can operate in a long-term in a power transmission network.

図１は本実施例におけるコンデンサ形計器用変圧器の回路構造模式図である。FIG. 1 is a schematic diagram of a circuit structure of a capacitor type instrument transformer in the present embodiment. 図２Ａは本実施例における第３のコンデンサＣ３の下部底板の構造模式図である。FIG. 2A is a structural schematic view of the lower base plate of the third capacitor C3 in the present embodiment. 図２Ｂは本実施例における第３のコンデンサＣ３の上部底板の構造上面模式図である。FIG. 2B is a schematic top view of the upper bottom plate of the third capacitor C3 in the present embodiment. 図３は本実施例における過渡過電圧監視システムの構造模式図である。FIG. 3 is a structural schematic view of the transient overvoltage monitoring system in the present embodiment.

以下、図面と実施例を参照しながら本開示について説明する。衝突がない限り、以下の実施例と実施例における特徴は互いに組み合わせることができる。   Hereinafter, the present disclosure will be described with reference to the drawings and the embodiments. As long as there is no conflict, the features of the following examples and examples can be combined with one another.

図１に示すように、過渡過電圧監視システム用のコンデンサ形計器用変圧器２は、第１のコンデンサＣ１、第２のコンデンサＣ２、第３のコンデンサＣ３、中間変圧器Ｔ、過渡過電圧監視ユニットＭ、接地ナイフスイッチＫ、補償リアクトルＬ、ダンパＺＤ、保護隙間Ｐ、第１の避雷器ＢＬ１及び第２の避雷器ＢＬ２を備え、第１のコンデンサＣ１は、一端が送電網１に接続され、他端が第２のコンデンサＣ２の一端と中間変圧器Ｔにおける一次巻線の一端にそれぞれ接続され、第２のコンデンサＣ２の他端は過渡過電圧監視ユニットＭの一端と補償リアクトルＬの一端にそれぞれ接続され、中間変圧器Ｔにおける一次巻線の他端は補償リアクトルＬの他端と第１の避雷器ＢＬ１の一端にそれぞれ接続され、過渡過電圧監視ユニットＭの他端と第１の避雷器ＢＬ１の他端はいずれも接地し、接地ナイフスイッチＫ、保護隙間Ｐ及び第２避雷器ＢＬ２は過渡過電圧監視ユニットＭの両端にそれぞれ並列接続され、ダンパＺＤは中間変圧器Ｔにおける二次巻線に設けられ、Ｕ１は送電網１の電圧であり、補償リアクトルＬはリアクタンス値を調整可能な抵抗であってもよく、異なる二次負荷で一次電圧（第１のコンデンサＣ１に接続された高電圧端の電圧）と
二次電圧（第３のコンデンサＣ３の両端の電圧又は中間変圧器Ｔから出力された電圧）との間に正確な位相と変圧比を取得できるように、補償リアクトルＬのリアクタンス値はコンデンサ形計器用変圧器２の等価容量の定格周波数での容量性リアクタンスと同じである。校正しやすくするために、位相差及び変圧比は安定しているべきであり、電圧変化とともにドリフトすることがなく、位相差はゼロであるのが最適で、又は一定に保たれるのが良い。図１のうち、Ｎは第２のコンデンサＣ２の低電圧端、１ａ、１ｎ、２ａ、２ｎ、ｄａ１、ｄａ２、ｄａｎは中間変圧器Ｔの二次巻線の出力端子である。第２避雷器ＢＬ２、保護隙間Ｐ及びダンパＺＤは好ましいデバイスであり、コンデンサ形計器用変圧器２に存在しなくてもよい。 As shown in FIG. 1, the capacitor type instrument transformer 2 for the transient overvoltage monitoring system includes a first capacitor C1, a second capacitor C2, a third capacitor C3, an intermediate transformer T, and a transient overvoltage monitoring unit M. , Ground contact knife switch K, compensation reactor L, damper ZD, protection gap P, first lightning arrester BL1 and second lightning arrester BL2, and one end of the first capacitor C1 is connected to the transmission grid 1, and the other end is One end of the second capacitor C2 and one end of the primary winding of the intermediate transformer T are respectively connected, and the other end of the second capacitor C2 is respectively connected to one end of the transient overvoltage monitoring unit M and one end of the compensation reactor L The other end of the primary winding in the intermediate transformer T is connected to the other end of the compensation reactor L and one end of the first lightning arrester BL1, respectively, and the other end of the transient overvoltage monitoring unit M The other ends of the first lightning arrester BL1 are all grounded, the grounding knife switch K, the protection gap P and the second lightning arrester BL2 are connected in parallel to both ends of the transient overvoltage monitoring unit M, and the damper ZD is two in the intermediate transformer T. Provided in the winding, U1 is the voltage of the transmission network 1, the compensation reactor L may be a resistor whose reactance value can be adjusted, and the primary voltage (connected to the first capacitor C1 with a different secondary load) Compensation reactor so that the correct phase and transformation ratio can be obtained between the high voltage end voltage) and the secondary voltage (the voltage across the third capacitor C3 or the voltage output from the intermediate transformer T) The reactance value of L is the same as the capacitive reactance at the rated frequency of the equivalent capacity of the capacitor type instrument transformer 2. To facilitate calibration, the phase difference and transformation ratio should be stable, do not drift with voltage changes, and the phase difference should optimally be zero or be kept constant. . In FIG. 1, N is a low voltage end of the second capacitor C2, and 1a, 1n, 2a, 2n, da1, da2 and dan are output terminals of the secondary winding of the intermediate transformer T. The second lightning arrester BL2, the protective gap P and the damper ZD are preferred devices and may not be present in the capacitor-type instrument transformer 2.

第１のコンデンサＣ１、第２のコンデンサＣ２及び第３のコンデンサＣ３が直列接続される場合、第１のコンデンサＣ１（高電圧アームとも呼称される）が高電圧端に接続され、第３のコンデンサＣ３（低電圧アームとも呼称される）が地面に接続される。本実施例のコンデンサ形計器用変圧器は異なる電圧等級の送電網に適用できるため、第１のコンデンサＣ１、第２のコンデンサＣ２及び第３のコンデンサＣ３の受ける電圧は同じでなく、一般的に、第１のコンデンサＣ１＞第２のコンデンサＣ２＞第３のコンデンサＣ３である。たとえば５００ｋＶ電圧等級システムでは、第１のコンデンサＣ１（高電圧アーム）が大部分の電圧降下を受け、第３のコンデンサＣ３（低電圧アーム）は約万分の１〜２の電圧だけを受け、３５ｋＶ電圧等級システムでは、低電圧アームが約千分の２〜３の電圧降下を受け、工学応用では、通常、第３のコンデンサＣ３の値を微調整することで、Ｃ３両端の最大動作電圧を約１００Ｖに安定化させる。   When the first capacitor C1, the second capacitor C2 and the third capacitor C3 are connected in series, the first capacitor C1 (also referred to as a high voltage arm) is connected to the high voltage end, and the third capacitor C3 (also referred to as a low voltage arm) is connected to the ground. The capacitor-type instrument transformer of this embodiment can be applied to transmission networks of different voltage classes, so the voltages received by the first capacitor C1, the second capacitor C2 and the third capacitor C3 are not the same, and in general The first capacitor C1> the second capacitor C2> the third capacitor C3. For example, in a 500kV voltage grade system, the first capacitor C1 (high voltage arm) receives most of the voltage drop, and the third capacitor C3 (low voltage arm) receives only a voltage of about 1/2000, 35kV. In voltage grade systems, the low voltage arm experiences a voltage drop of about 2 to 3 thousandths, and in engineering applications, the maximum operating voltage across C3 is usually about by fine tuning the value of the third capacitor C3. Stabilize to 100V.

好ましくは、図２Ａと図２Ｂに示すように、第３のコンデンサＣ３は相互に並列接続され、すべて同軸円周構造として配列された複数の無誘導コンデンサ素子９からなる。過渡過電圧監視ユニットＭは第３のコンデンサＣ３に並列接続される。過渡過電圧監視ユニットＭの高電圧端がＣＶＴ内部の第２のコンデンサＣ２の低電圧端Ｎに直列接続され、第３のコンデンサＣ３の接地端子が銅シート又は銅帯により接地し、第３のコンデンサＣ３の測定端子が標準コネクタを用いて同軸ケーブルを介してＣ３両端の電圧信号をデジタル収集装置（すなわち過渡過電圧監視ユニットＭ）に送信する。   Preferably, as shown in FIGS. 2A and 2B, the third capacitors C3 are comprised of a plurality of non-inductive capacitor elements 9 connected in parallel with one another and all arranged as a coaxial circumferential structure. The transient overvoltage monitoring unit M is connected in parallel to the third capacitor C3. The high voltage end of the transient overvoltage monitoring unit M is connected in series to the low voltage end N of the second capacitor C2 inside the CVT, the ground terminal of the third capacitor C3 is grounded by a copper sheet or a copper band, and the third capacitor The measuring terminal of C3 transmits the voltage signal at both ends of C3 to the digital collecting apparatus (ie, transient over-voltage monitoring unit M) via a coaxial cable using a standard connector.

図３に示すように、本実施例は、電力システムの運転装置に発生した複数種の形式の過渡電圧（商用周波過電圧、操作過電圧及び雷過電圧等を含む）を監視する過渡過電圧監視システムを提供する。過渡過電圧監視システムは、コンデンサ形計器用変圧器２、保護器４、過渡電圧収集装置６及び産業用コンピュータ８を備え、コンデンサ形計器用変圧器２は送電網１の送電回線又はバスに接続され、伝送ケーブル３を介して保護器４に接続され、保護器４は通信光ケーブル５により過渡電圧収集装置６に接続され、過渡電圧収集装置６は通信ケーブル７により産業用コンピュータ８に接続される。過渡過電圧オンライン監視とは、分圧センサによって、信号収集技術を用い、送電網システムの電圧外乱をリアルタイムに監視し、過渡過電圧が発生した場合の各種の相電圧の振幅、故障前後の波形及び各種のパラメータを記録・記憶し、信号処理とパラメータ抽出、使用と分析（たとえば、警報、履歴データ問い合わせ及び統計等）の機能を有する。   As shown in FIG. 3, the present embodiment provides a transient overvoltage monitoring system that monitors multiple types of transient voltages (including commercial frequency overvoltage, operation overvoltage, lightning overvoltage, etc.) generated in a power system operating device. Do. The transient over-voltage monitoring system includes a capacitor-type instrument transformer 2, a protector 4, a transient voltage collector 6, and an industrial computer 8. The capacitor-type instrument transformer 2 is connected to a transmission line or bus of the transmission network 1. The transmission cable 3 is connected to the protector 4, the protection device 4 is connected to the transient voltage collection device 6 by the communication optical cable 5, and the transient voltage collection device 6 is connected to the industrial computer 8 by the communication cable 7. Transient over-voltage on-line monitoring uses signal collection technology with a partial pressure sensor to monitor voltage disturbances of the transmission system in real time, and amplitudes of various phase voltages when transient over-voltage occurs, waveforms before and after failure, and various types Record and store parameters, and have functions of signal processing and parameter extraction, use and analysis (for example, alarm, historical data query and statistics, etc.).

本開示は、動作周波数が高く、測定データの精度が高く、適用範囲が広く、インテリジェント送電網の情報化と自動化の機能による要求を満たし、過電圧と絶縁の複合技術の発展による要求を満たすことができる過渡過電圧監視システム用のコンデンサ形計器用変圧器を提供する。   The present disclosure is to meet the requirements due to the development of combined technology of over voltage and insulation, which has high operating frequency, high accuracy of measurement data, wide application range, intelligent information grid automation and information network functions. A capacitor-type instrument transformer for a transient over-voltage monitoring system that can

図中：１、送電網、２、コンデンサ形計器用変圧器、３、伝送ケーブル、４、保護器、
５、通信光ケーブル、６、過渡電圧収集装置、７、通信ケーブル、８、産業用コンピュータ、９、無誘導コンデンサ素子、Ｃ１、第１のコンデンサ、Ｃ２、第２のコンデンサ、Ｃ３、第３のコンデンサ、Ｍ、過渡過電圧監視ユニット、Ｔ、中間変圧器、Ｋ、接地ナイフスイッチ、Ｌ、補償リアクトル、ＺＤ、ダンパ、Ｐ、保護隙間、ＢＬ１、第１の避雷器、ＢＬ２、第２の避雷器。 In the figure: 1, transmission grid, 2, condenser-type instrument transformer, 3, transmission cable, 4, protector
5, communication optical cable 6, transient voltage collector 7, communication cable 8, industrial computer 9, non-inductive capacitor element C1, first capacitor C2, second capacitor C3, third capacitor , M, transient overvoltage monitoring unit, T, intermediate transformer, K, grounding knife switch, L, compensation reactor, ZD, damper, P, protective gap, BL1, first lightning arrester, BL2, second lightning arrester.

Claims (5)

過渡過電圧監視システム用のコンデンサ形計器用変圧器であって、
第１のコンデンサ、第２のコンデンサ、第３のコンデンサ、過渡過電圧監視ユニット、中間変圧器、接地ナイフスイッチ、補償リアクトル、及び第１の避雷器を備え、前記第１のコンデンサは、一端が送電網に接続され、他端が第２コンデンサの一端と中間変圧器における一次巻線の一端にそれぞれ接続され、前記第２のコンデンサの他端は過渡過電圧監視ユニットの一端と補償リアクトルの一端にそれぞれ接続され、前記中間変圧器における一次巻線の他端は補償リアクトルの他端と第１の避雷器の一端にそれぞれ接続され、前記過渡過電圧監視ユニットの他端と第１の避雷器の他端はいずれも接地し、前記接地ナイフスイッチは過渡過電圧監視ユニットの両端に並列接続され、前記第３のコンデンサは、一端が前記第２のコンデンサの他端に接続されて、他端が接地し、前記第１のコンデンサの耐えられる電圧が前記第２のコンデンサの耐えられる電圧より大きく、前記第２のコンデンサの耐えられる電圧が前記第３のコンデンサの耐えられる電圧より大きく、
前記補償リアクトルのリアクタンス値は、前記コンデンサ形計器用変圧器の等価容量の定格周波数での容量性リアクタンスと同じであるコンデンサ形計器用変圧器。 Capacitor-type instrument transformer for transient over-voltage monitoring system,
A first capacitor, a second capacitor, a third capacitor, a transient overvoltage monitoring unit, an intermediate transformer, a ground knife switch, a compensation reactor, and a first lightning arrester, wherein the first capacitor has one end connected to the power grid And the other end is respectively connected to one end of the second capacitor and one end of the primary winding in the intermediate transformer, and the other end of the second capacitor is respectively connected to one end of the transient overvoltage monitoring unit and one end of the compensation reactor. The other end of the primary winding in the intermediate transformer is connected to the other end of the compensation reactor and one end of the first lightning arrester, and the other end of the transient overvoltage monitoring unit and the other end of the first arrester are both The grounding knife switch is connected in parallel across the transient overvoltage monitoring unit, and the third capacitor has one end connected to the other of the second capacitor. And the other end is grounded, the withstand voltage of the first capacitor is greater than the withstand voltage of the second capacitor, and the withstand voltage of the second capacitor is withstand of the third capacitor. larger than the voltage that is rather,
The capacitor type instrument transformer, wherein a reactance value of the compensation reactor is the same as a capacitive reactance at a rated frequency of an equivalent capacity of the capacitor type instrument transformer. 過渡過電圧監視ユニットの両端に並列接続される第２の避雷器をさらに備える請求項１に記載のコンデンサ形計器用変圧器。   The capacitor type instrument transformer according to claim 1, further comprising a second lightning arrester connected in parallel to both ends of the transient overvoltage monitoring unit. 前記補償リアクトルはリアクタンス値を調整可能な抵抗である請求項１に記載のコンデンサ形計器用変圧器。   The capacitor type instrument transformer according to claim 1, wherein the compensation reactor is a resistor whose reactance value can be adjusted. 中間変圧器における二次巻線に設けられるダンパをさらに備える請求項１に記載のコンデンサ形計器用変圧器。   The capacitor type instrument transformer according to claim 1, further comprising a damper provided to a secondary winding in the intermediate transformer. 過渡過電圧監視ユニットの両端に並列接続される保護隙間をさらに備える請求項１に記載のコンデンサ形計器用変圧器。   The capacitor type instrument transformer according to claim 1, further comprising a protection gap connected in parallel to both ends of the transient overvoltage monitoring unit.
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