METRIC STANDARS
Mechanical Tolerances
- A & B- Exterior dimensions. Held to a minimum tolerance, only to ensure overall enclosure fit.
- D & E- Dimension held to + tolerance to insure magnetic qualities under all applications.
- F & G- Window dimensions. Held to a minimum tolerance, only to ensure coil fit.
MEASURMENT:
- D- Dimension measured by caliper at any point on either core half.
- E- Dimension measured at the butt joint.
- F & G- Dimension measured at the shortest point, at least twice the radius R from the edge of the window.
| Quality grade |
Quality code |
Thickness, mm |
Test conditions,(3) |
Guaranteed values for bonded, cut or uncut cores |
|||
|---|---|---|---|---|---|---|---|
| Bm, T | f, Hz | W/kg (4) | VARm/kg (1) | VARg/kg (2) | |||
| Standard | ELA | 0.30 | 1.7 | 50 | 2.4 | 9.90 | 27xAc minWt. min(a=0.075mm) |
| Standard | ELH | 0.10 | 1.5 | 400 | 26.4 | 28.60 | 111xAc minWt. min(a=0.05mm) |
- VARm/kg – specific reactive power of metal.
- VARg/kg – specific reactive power of air-gap, a = air-gap length
- Test conditions based upon mono-phase excitation of center leg.
- Values are 20% higher than for C-core because of third harmonic flux.
