JP2022084949A5 - Ground fault current suppression system with built-in Ior ground fault current detection software, insulation monitoring device and control method - Google Patents
Ground fault current suppression system with built-in Ior ground fault current detection software, insulation monitoring device and control method Download PDFInfo
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- JP2022084949A5 JP2022084949A5 JP2022062339A JP2022062339A JP2022084949A5 JP 2022084949 A5 JP2022084949 A5 JP 2022084949A5 JP 2022062339 A JP2022062339 A JP 2022062339A JP 2022062339 A JP2022062339 A JP 2022062339A JP 2022084949 A5 JP2022084949 A5 JP 2022084949A5
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- 230000001629 suppression Effects 0.000 title claims 31
- 238000009413 insulation Methods 0.000 title claims 19
- 238000000034 method Methods 0.000 title claims 3
- 238000012806 monitoring device Methods 0.000 title claims 2
- 238000001514 detection method Methods 0.000 claims 8
- 229910001219 R-phase Inorganic materials 0.000 claims 2
- 230000018199 S phase Effects 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 claims 1
Claims (11)
前記Ｂ種接地線に流れる漏洩電流を検出する漏洩電流検出部と、 a leakage current detection unit that detects a leakage current flowing through the B-type ground wire;
前記漏洩電流検出部で検出した漏洩電流に基づいて、対地絶縁抵抗に起因する漏洩電流を算出する算出部と、 a calculation unit that calculates a leakage current caused by an insulation resistance to ground based on the leakage current detected by the leakage current detection unit;
制御部とを備え、 and a control unit,
前記算出部は、前記切替スイッチが開放されて地絡抑制状態になった場合、前記切替スイッチが閉塞されている状態を想定して、想定漏洩電流と、対地絶縁抵抗に起因する想定漏洩電流を算出し、 The calculator calculates an assumed leakage current and an assumed leakage current caused by the ground insulation resistance on the assumption that the changeover switch is closed when the changeover switch is opened and a ground fault suppression state is established. calculate,
前記制御部は、前記算出部により算出した対地絶縁抵抗に起因する想定漏洩電流が所定時間継続して第２閾値を下まわっている場合、前記切替スイッチを閉塞して地絡抑制状態を解除するＩｏｒ地絡点電流検出ソフト組込型地絡電流抑制システム。 The control unit closes the changeover switch to cancel the ground fault suppression state when the estimated leakage current caused by the insulation resistance to ground calculated by the calculation unit is below a second threshold continuously for a predetermined time. Ior ground fault current detection software built-in ground fault current suppression system.
請求項１に記載のＩｏｒ地絡点電流検出ソフト組込型地絡電流抑制システム。 The Ior ground fault current detection software embedded type ground fault current suppression system according to claim 1.
前記制御部は、前記算出部により算出した対地絶縁抵抗に起因する漏洩電流が所定時間継続して第１閾値を超えているかどうかを判断し、対地絶縁抵抗に起因する漏洩電流が所定時間継続して第１閾値を超えていると判断した場合、前記切替スイッチを開放して地絡抑制状態に制御する、
請求項１又は請求項２に記載のＩｏｒ地絡点電流検出ソフト組込型地絡電流抑制システム。 Calculate the phase angle of the vector- synthesized leakage current based on the vector-synthesized leakage current and the voltage applied between the live line phases, and calculate the vector-synthesized leakage current and the vector-synthesized leakage current A ground fault identification unit that calculates the leakage current due to the insulation resistance to ground and the leakage current due to the capacitance to ground based on the phase angle, and specifies which of the phases other than the ground phase has the ground fault. has
The control unit determines whether the leakage current caused by the ground insulation resistance calculated by the calculation unit continues for a predetermined time and exceeds a first threshold value, and determines whether the leakage current caused by the ground insulation resistance continues for the predetermined time. If it is determined that the first threshold is exceeded, the switch is opened and controlled to a ground fault suppression state ;
The Ior ground fault current detection software built-in type ground fault current suppression system according to claim 1 or claim 2 .
前記算出部は、前記地絡特定部により特定した地絡が発生している相の対地絶縁抵抗に起因する漏洩電流を算出する請求項３記載のＩｏｒ地絡点電流検出ソフト組込型地絡電流抑制システム。 A monitoring unit that monitors changes in leakage current caused by ground capacitance in phases other than the vector-synthesized ground phase in a state where the changeover switch is closed,
4. The Ior ground fault point current detection software built-in type ground according to claim 3 , wherein the calculation unit calculates the leakage current caused by the insulation resistance to ground of the phase in which the ground fault has occurred identified by the ground fault identification unit. fault current suppression system.
ベクトル合成された漏洩電流の位相角度がＲ相の位相角度以上であってＴ相の位相角度未満である場合、Ｒ相に地絡が発生していると特定し、
ベクトル合成された漏洩電流の位相角度がＴ相の位相角度以上であって対地静電容量に起因する漏洩電流の位相角度未満である場合、対地静電容量に起因する漏洩電流の候補である位相角度１８０度の漏洩電流Ｉｏｃ（ｒｔ）１と位相角度０度の漏洩電流Ｉｏｃ（ｒｔ）２の経時的な変化を監視し、変化が小さい方に対応する相を地絡が発生している相と特定する、
請求項６に記載のＩｏｒ地絡点電流検出ソフト組込型地絡電流抑制システム。 The ground fault identification unit
identifying that a ground fault has occurred in the R phase when the phase angle of the vector-synthesized leakage current is equal to or greater than the phase angle of the R phase and less than the phase angle of the T phase;
If the phase angle of the vector-combined leakage current is greater than or equal to the phase angle of the T-phase and less than the phase angle of the leakage current caused by the ground capacitance, the phase that is a candidate for the leakage current caused by the ground capacitance The changes over time of the leakage current Ioc(rt)1 at an angle of 180 degrees and the leakage current Ioc(rt)2 at a phase angle of 0 degrees are monitored, and the phase corresponding to the smaller change is determined as the phase where the ground fault is occurring. to specify
The Ior ground fault current detection software embedded type ground fault current suppression system according to claim 6 .
前記地絡特定部は、前記漏洩電流検出部が検出した漏洩電流と、Ｒ相－Ｔ相間に印加されている電圧に基づいて、漏洩電流の位相角度を算出し、
前記算出部は、前記切替スイッチが開放され、地絡抑制状態になった場合に、前記切替スイッチが開放された直後の対地静電容量を算出し、前記対地静電容量に基づいて対地絶縁抵抗を算出する、
請求項３乃至請求項８の何れか一項に記載のＩｏｒ地絡点電流検出ソフト組込型地絡電流抑制システム。 The secondary side of the transformer is a single-phase three-wire connection, each wire connected to two ends of the single-phase three-wire connection is a live wire, and the wire connected to the middle point is the B class as a ground wire,
The ground fault identification unit calculates a phase angle of the leakage current based on the leakage current detected by the leakage current detection unit and the voltage applied between the R phase and the T phase,
When the changeover switch is opened and a ground fault suppression state is established, the calculation unit calculates a ground capacitance immediately after the changeover switch is opened, and calculates an insulation resistance to ground based on the ground capacitance. to calculate
The Ior ground fault current detection software embedded type ground fault current suppression system according to any one of claims 3 to 8 .
前記Ｂ種接地線に流れる漏洩電流を検出する漏洩電流検出部と、 a leakage current detection unit that detects a leakage current flowing through the B-type ground wire;
を含むＩｏｒ地絡点電流検出ソフト組込型地絡電流抑制システムにおける絶縁監視装置であって、 An insulation monitoring device in an Ior ground fault current detection software embedded ground current suppression system comprising:
前記漏洩電流検出部で検出した漏洩電流に基づいて、対地絶縁抵抗に起因する漏洩電流を算出する算出部と、制御部と、を備え、 a calculation unit for calculating leakage current caused by ground insulation resistance based on the leakage current detected by the leakage current detection unit; and a control unit,
前記算出部は、前記切替スイッチが開放されて地絡抑制状態になった場合、前記切替スイッチが閉塞されている状態を想定して、想定漏洩電流と、対地絶縁抵抗に起因する想定漏洩電流を算出し、 The calculator calculates an assumed leakage current and an assumed leakage current caused by the ground insulation resistance on the assumption that the changeover switch is closed when the changeover switch is opened and a ground fault suppression state is established. calculate,
前記制御部は、前記算出部により算出した対地絶縁抵抗に起因する想定漏洩電流が所定時間継続して第２閾値を下まわっている場合、前記切替スイッチを閉塞して地絡抑制状態を解除する、 The control unit closes the changeover switch to cancel the ground fault suppression state when the estimated leakage current caused by the insulation resistance to ground calculated by the calculation unit is below a second threshold continuously for a predetermined time. ,
絶縁監視装置。 Insulation monitor.
前記Ｉｏｒ地絡点電流検出ソフト組込型地絡電流抑制システムは、 The Ior ground fault current detection software built-in ground fault current suppression system is
変圧器のＢ種接地線に設けられ、抑制抵抗と、当該抑制抵抗の両端を開放または閉塞を切り替える切替スイッチとが並列接続されて構成される地絡電流抑制部と、 a ground fault current suppression unit provided in the class B grounding wire of the transformer and configured by parallel connection of a suppression resistor and a changeover switch for switching between opening and closing both ends of the suppression resistor;
前記Ｂ種接地線に流れる漏洩電流を検出する漏洩電流検出部と、 a leakage current detection unit that detects a leakage current flowing through the B-type ground wire;
前記漏洩電流検出部で検出した漏洩電流に基づいて、対地絶縁抵抗に起因する漏洩電流を算出する算出部と、 a calculation unit that calculates a leakage current caused by an insulation resistance to ground based on the leakage current detected by the leakage current detection unit;
制御部とを備え、 and a control unit,
前記算出部により、前記切替スイッチが開放されて地絡抑制状態になった場合、前記切替スイッチが閉塞されている状態を想定して、想定漏洩電流と、対地絶縁抵抗に起因する想定漏洩電流を算出するステップと、 The calculation unit calculates an assumed leakage current and an assumed leakage current caused by the ground insulation resistance on the assumption that the changeover switch is closed when the changeover switch is opened and a ground fault suppression state is established. a calculating step;
前記制御部により、前記算出部により算出した対地絶縁抵抗に起因する想定漏洩電流が所定時間継続して第２閾値を下まわっている場合、前記切替スイッチを閉塞して地絡抑制状態を解除するステップと、 The control unit closes the changeover switch to release the ground fault suppression state when the estimated leakage current due to the insulation resistance to ground calculated by the calculation unit is below the second threshold continuously for a predetermined time. a step;
を含む制御方法。 Control method including.
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