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IEC60112 Flammability Testing Equipment Determination of CTI And PTI
Standard:
IEC60112-2009 Method for the determination of the proof and the comparative tracking indices of solid insulating materials.
It specifies the method of test for the determination of the proof and comparative tracking indices of solid insulating materials on pieces taken from parts of equipment and on plaques of material using alternating voltages. Flammability Testing Equipment
Proof tracking index (PTI)
Where, in IEC standards for material or for electrical equipment specifications, or in other standards, a proof test only is required, 50 drop tests shall be made in accordance with Clause 8 but at the single voltage specified. The required number of specimens shall withstand the test period up to at least 25 s after the fiftieth drop has fallen without tracking failure, and without a persistent flame occurring.
Operation of the over-current device by air arcs does not constitute a tracking failure.
The proof voltage shall be an integer multiple of 25 V.
Comparative tracking index (CTI)
Determination of the comparative tracking index requires the determination of the maximum voltage at which five specimens withstand the test period for 50 drops without failure and whether, at a voltage of 25 V lower than the maximum 50 drop figure, the specimen withstands 1 00 drops. If this is not the case, the maximum 1 00 drop withstand voltage has to be determined.
Parameter:
| Model | LT-2(0.5m³) | LT-3(0.5m³) (Touch screen) |
| Working voltage | 220V/50Hz, 1KVA | 220V/50Hz, 1KVA |
| Control operation mode | Electrical control, button operation | PLC control, 7 inch color touch screen operation, with infrared remote control |
| Testing voltage | 0-600V adjustable, precision 1.5% | |
| Timing device | 9999X0.1S. Flammability Testing Equipment | |
| Electrodes | Material: Platinum electrode and brass connecting rod | |
| The two electrodes shall have a rectangular cross-section of (5 ± 0,1 ) mm × (2 ± 0,1 ) mm, with one end chisel-edged with an angle of 30° ± 2° (see Figure 1 ). The sharp edge shall be removed to produce an approximately flat surface, 0,01 mm to 0,1 mm wide | ||
| Relative position of electrode | Included angle: 60°±5°, distance is 4±0.1mm | |
| Electrode pressure | 1.00N±0.05N | 1.00N±0.05N, Touch screen display |
| Dripping liquid | The interval time of dropping liquid: 30±5S, digital display, can be preset | |
| Height: 35±5mm | ||
| The number of drips:0-9999 times, can be preset, the volume size of the dripping liquid is controlled by the imported micro pump within 50 ~ 45 drips /cm³ | ||
| Test solutions | Solution A: 0.1%NH4Cl, 3.95±0.05Ωm, Solution B: 0.1%NH4Cl + 0.5± 0.002% sodium-di-butyl naphthalene sulfonate, 1.98±0.05Ωm | |
| Time-delay circuit | 2±0.1S (in 0.5A or larger current) | |
| Short-circuit pressure drop | 1±0.1A 1%, pressure drop 8% MAX | |
| Wind speed | 0.2m/s. | |
| Environmental requirement | 0～40℃, relative humidity≤80%, in the place of no obvious vibration and corrosive gas | |
| Dimensions and weight | WDH=1100×550×1200 mm, 130kg | WDH=1100×550×1200 mm, 130kg |
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