Automatic Inverse Time Protective Relays IDMT Overcurrent Protection
Product Summary
Product Details
Overcurrent Protection Relay
,Power System Protection Relays
Product Description
Automatic Inverse Time Protective Relays IDMT Overcurrent Protection
Time overcurrent relays operate with a time delay, which is adjustable. For given setting, the actual time delay depends on the current through the relay coil. Higher current will cause a faster operation of the relay. The minimum relay operation current (pick-up current) is also adjustable.
The most commonly used overcurrent relay has both the instantaneous response for very large currents and the inverse time response for lower currents. A relay is intended protect loads or circuits from excessive current.
Description:
Purple Horn overcurrent protection delivers comprehensive protection schemes for low voltage applications. All Mikro's overcurrent units are microprocessor-based numerical relays and are housed in high-strength protective casing. The models in the range provide a wealth of options including programmable relay outputs to static, and digital display or dial activated..
FEATURES
A. Low-set inverse definite minimum time relay
B. High-set instantaneous
C. Separate low-set and high-set trip indicators
D. Trip starting indication
Specifications:
|
Settings |
|
|
Current rating |
5A |
|
Rated frequency |
50/60Hz |
|
Load |
< 0.3VA at In |
|
Thermal withstand |
4*ln |
|
Auxiliary supply |
|
|
Voltage |
198-265VAC |
|
Frequency |
50/60Hz |
SETTING RANGES
Low-set: 2A to 6A; 40% to 120%
Time multiplier: 0.01 to 1.0
IDMT curve: Normal inverse
High-set(l>>): i> to 5× l>
CONTACTS
Trip contact: Automatic reset type
Contact rating: NC NO contact type
6A. 250V AC
Silver alloy contact material
100, 000 electrical operations at rated currents
IINDICATORS
Trip indicator: Manual reset type
PERFORMANCE
Adjustable accuracy: Less than ± 5%
Repeatability: Less than 0.5% of full scale
Benefit:
- Accurate, reliable and more resistant to vibration and shock than traditional electromechanical relays
- Current measurement based on fundamental frequency, prevents nuisance tripping
- Digital display or dial activated for ease of use
- Robust casing protects the unit from external interference
- Complies with IEC 60255-26 standards
Applications:
Feeder incoming protection
Outgoing protection
Busbar protection
Full series: earth leakage relay, earth fault relay, overcurrent relay, zero phase transformer
