Muhandislik uchun bepul vosita
Motor Izolyatsiyasining Qarshiligini Talqin Qilish Vositasi
IEEE Std 43 bo'yicha megger sinov natijalarini talqin qiling. Minimal qabul qilinadigan izolyatsiya qarshiligini, harorat tuzatilgan qiymatlarini, polyarizatsiya indeksini va trend bo'yicha tavsiyalarni hisoblang.
Interpretation
Minimal izolyatsiya qarshiligi (IEEE 43)
Per IEEE Std 43, the minimum recommended 1-minute insulation resistance at 40 °C is:
Where kV is the rated voltage in kilovolts. For a 4160V motor: R_min = 4.16 + 1 = 5.16 MΩ.
Harorat korreksiyasi
Insulation resistance approximately doubles for every 10 °C decrease in temperature. To normalize to 40 °C:
For a reading at 25 °C: C_T = 0.5^((40−25)/10) = 0.5^1.5 = 0.354. So a 500 MΩ reading at 25 °C becomes 177 MΩ at 40 °C.
Polyarizatsiya indeksi (PI)
| PI Value | Izolyatsiya holati |
|---|---|
| < 1.0 | Xavfli — energiya bermang |
| 1.0 – 2.0 | Questionable |
| 2.0 – 4.0 | Good |
| > 4.0 | Excellent |
Tavsiya etilgan sinov kuchlanishlari (IEEE 43)
| Motorning Nominal Kuchlanishi | O'zgarmas tok sinov kuchlanishi |
|---|---|
| < 1000 V | 500 V DC |
| 1000 – 2500 V | 500 – 1000 V DC |
| 2501 – 5000 V | 1000 – 2500 V DC |
| 5001 – 12000 V | 2500 – 5000 V DC |
| > 12000 V | 5000 – 10000 V DC |
⚠️ Important: Yagona izolyatsiya qarshiligi ko'rsatkichi trendga qaraganda kamroq ma'lumot beradi. Har doim o'xshash sharoitlarda olingan oldingi ko'rsatkichlar bilan solishtiring. Keskin pasayish (>50%) mutlaq past, ammo barqaror qiymatdan ko'ra xavfliroqdir.
Professional dala balansirovka asboblari va dasturiy ta'minot. 50dan ortiq mamlakatda qo'llaniladi.
