To easily detect an electric abnormality of an electric snow-melting device.SOLUTION: An electric snow-melting device sensor 1 comprises a voltage sensor 3, a current sensor 4, and a control unit 5. The voltage sensor 3 measures a supply voltage V supplied to a heater 21. An electric snow-melting device 2 is supplied with electric power by a single-phase three-wire system. The voltage sensor 3 measures the supply voltage V supplied to the heater 21. The current sensor 4 measures load current I of voltage lines 22a and 22b. The control unit 5 determines existence of an abnormality of the electric snow-melting device 2 on the basis of measurement values of the supply voltage V and the load current I of the voltage lines 22a and 22b. When the supply voltage V is higher than or equal to a prescribed voltage threshold value V7 for a low-current abnormality and the load current I is less than a prescribed low-current abnormality threshold value I1, the control unit 5 determines that a low-current abnormality has occurred. When the load current I becomes higher than or equal to a prescribed low-current abnormality recovery threshold value I2, the control unit 5 determines that the electric snow-melting device has recovered from the low-current abnormality. The low-current abnormality recovery threshold value I2 is set to a value higher than or equal to the low-current abnormality threshold value I1.SELECTED DRAWING: Figure 1
【課題】電気融雪器の電気的な異常を容易に検出する。【解決手段】電気融雪器センサ1は、電圧センサ3と、電流センサ4と、制御部5とを備える。電圧センサ3は、ヒータ21に供給する供給電圧Vを測定する。電気融雪器2は、単相3線式で電力が供給される。電圧センサ3は、ヒータ21に供給する供給電圧Vを測定する。電流センサ4は、各電圧線22a、22bの負荷電流Iを測定する。制御部5は、供給電圧V及び各電圧線22a、22bの負荷電流Iの測定値に基づいて電気融雪器2の異常の有無を判定する。供給電圧Vが所定の小電流異常用電圧閾値V7以上かつ負荷電流Iが所定の小電流異常閾値I1未満であるとき、制御部5は、小電流異常が発生していると判定する。負荷電流Iが所定の小電流異常回復閾値I2以上になったとき、制御部5は、小電流異常から回復したと判定する。小電流異常回復閾値I2は、小電流異常閾値I1以上の値に設定されている。【選択図】図1
ELECTRIC SNOW-MELTING DEVICE SENSOR AND MONITORING SYSTEM
電気融雪器センサ及び監視システム
2022-11-10
Patent
Electronic Resource
Japanese
ROAD ELECTRIC SIGN SYSTEM DEVICE CAPABLE OF CONTROLLING SNOW MELTING
European Patent Office | 2024
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