Automatic Inverse Time Protective Relays IDMT Overcurrent Protection

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:

KRIPAL 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:

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

Zhejiang Kripal Electric Co.,Ltd is one of the national new high-tech enterprises integrated of researching, producing and selling water-proof electric, low-voltage electric and new energy electric products.

Established in 1992, Kripal now is gradually becoming the influential electric manufacturer in China after many years well development.

With a great brand effect , Kripal has the completed sales and service network with its products been exported to all over the world like Europe,Australia, American,Africa, Oceania, Southeast of Asia, and district of HongKong, Macaw and Taiwan. Kripal is awarded the title of “Famous Export Brand”.

Kripal now has the factory area 12000 m2 and workers more than 500, including over 10 senior engineers, 30 professional technicists and 30 senior executives. Products pass the certification of CE, CB, UL, VDE, TUV, KEMA, SAA, SEMKO, RoHS, and China CCC as well as quality management system such as ISO9001.

Cooperated with domestic and foreign R&D institutions, Kripal successively developed more than 100 independent intellectual properties; some of them were successfully awarded the national patent for invention and utility models as its well performance. Kripal now has been selected as provincial technical research and development center and patent demonstration enterprise by government.

Kripal always adheres to the enterprise principle of “Scientific management, Independent Innovation, Coordinating Collaboration and Cultural Brand”, keep faith of “moral first”, and fulfill the core value of “double-win cooperation with customers, creating profit for company owners, getting rich together with workers, building harmony for society” and fight for the mission of “make the dream of world famous electrical brand come true”.

Workers: 650 (including workers in Taizhou factory)
 
Engineers: more than 30
 
QA/QC: more than 20
 
Certificate: CQC, CB, CE,VDE,UL, TUV, Semko, KEMA, SAA, ISO9001
 
The land space of the company: amounts to 25000m2
 
What we do: products’ design, mold building, production of parts (injection & punching), assembling,
                      products’ inspection, testing and etc

KRIPAL adheres to the belief - "scientific management, independent innovation, coordinating collaboration, and cultural brand" and the enterprise principle - "we are advancing every day".