- Analog Meters
- Moving Iron Instruments
- Moving Coil Instruments
- Moving Coil Instruments with rectifier
- Moving coil instruments with suppressed zero
- Frequency Meters
- Power Meters
- Sychronising Meters
- Digital Meters
- Power Analyzer
- DC Meter-cum-Single Phase Power Analyzer
- Amp hour/Amp min. Meter with Voltmeter
- 3 Digit Meters
- 4 Digit Meters
- 4 or 5 Digit true RMS Meters
- LT / CT's
- Bar Type
- Resin Cast Type
- Wound Type
- Portable Type
- DC Shunts
- Standard Type
- Transducers
- Under Construction
- Portable Meters
- Portable
- Educational Desk Model Meter
PRODUCTS - LT / CT ' s
“EIC” make Current Transformers are manufactured from very superior quality Continuous cold rolled grain- oriented (CRGO) silicon steel. All CTs conforms to IS 2705.
These commercial grade, low cost window type current transformers are used in such applications as panelboards, control panels and engine generators. Many different models with numerous window sizes and ratios are available in addition to those shown below. Contact us with your requirements or a brief description of your application.
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LIMITS OF ERROR FOR ACCURACY CLASSES 0.1 to 5.0 (Classes 3.2.1 and 4.1 and 3.2.2). ISSW 2705
| Accuracy Class | Percentage Current (Ratio) Error At Percentage of Rated Current | Phase Displacement in Minutes At Percentage of Rated Current | |||||||
| 5 | 20 | 50 | 100 | 120 | 5 | 20 | 100 | 120 | |
| 0.1 | 0.4 | 0.2 | 0.1 | 0.1 | 15 | 8 | 5 | 5 | |
| 0.2 | 0.75 | 0.35 | 0.2 | 0.2 | 30 | 15 | 10 | 10 | |
| 0.5 | 1.5 | 0.75 | 0.5 | 0.5 | 90 | 25 | 30 | 30 | |
| 1.0 | 3.0 | 1.5 | 1.0 | 1.0 | 180 | 90 | 60 | 60 | |
| 3 | 3 | 3 | |||||||
| 5 | 5 | 5 | |||||||
SUGGESGED BURDEN GUIDE
| Moving Iron Ammeters | 1.5 VA to 5 VA |
| Recording Ammeters | 2VA to 10VA |
| Recording Thermal Demand Wattmeter | 0.7VA to 1.4 VA |
| KWH Meters | 0.3 VA to 0.6 VA |
| Thermal Demand Ammeter | |
| Thermal Maximum Demand Ammeters | 3 VA |
| Cable 7/029 5 Amp Secondary 0.05 VA/ft | 4VA to 8 VA |
| 1 Amp Secondary 0.002VA / ft |
DIRECTIONS FOR USE
- The secondary circuit of the transformer must be grounded. Make sure secondary circuit is never opened while current is flowing in primary windings, otherwise high voltage will result. The grounding of secondary circuit eliminates error due to accumulation of electrostatic charges on the instruments.
- Secondary winding should be short circuited and the linle voltae should be cut when charging instruments or when not in use.
- For the primary winding to which the line voltage is directly applied, use a wire insulated well enough to withstand the specified maximum line voltage.
- In the case of Portable CTs, cut off the line voltage befor emaking primary connections. As the primary winding is wound around the wooden case for measurement of more than 150A be sure to select an instruments transformer whose rated burden is larger than the volt-ampere loss of the instruments to be connected with the secondary of the transformer.