11kV Vacuum Circuit Breaker

NEEK-IEEF Vacuum Circuit Breaker (VCB) Features for Transformer Protection

Voltage Rating:

Designed for 11kV electrical distribution systems, providing effective protection in medium-voltage applications.

Vacuum Technology:

Available in 630A, 800A, 1250A, 1600A, 2000A, 2500A, 3150A upto 4000A utilizes vacuum arc-quenching for superior performance, longer lifespan, and minimal maintenance.

High Interrupting Capacity:

High fault current interrupting capacity 25kA/31.5kA to protect transformers from overcurrent and short circuit conditions.

Transformer Protection:

Overload & Short Circuit Protection: Ensures rapid disconnection during overload or short circuit conditions, safeguarding the transformer.

Inrush Current Limiting: Prevents damage from transformer inrush currents at startup by coordinating with protective relays.

Oil or Gas Transformer Protection: Designed to integrate seamlessly with transformer protection schemes, preventing potential damage from overloading or fault conditions.

Compact Design:

Metal-enclosed switchgear minimizes space usage while providing robust protection in substations.

Safety Features:

IP2X protection ensures safety of personnel and equipment.

Equipped with mechanical and electrical interlocks to prevent incorrect operation.

Environmentally Friendly:

No SF6 gas is used, making the VCB more eco-friendly compared to other circuit breakers.

Reliable Operation:

Motor-driven spring mechanism ensures quick, consistent, and reliable operation.

Low Maintenance:

Minimal wear on the vacuum interrupters reduces maintenance frequency and downtime.

Flexible Applications: Ideal for protecting transformers and medium-voltage circuits in industrial, commercial, and power distribution systems.

Optional Features:

Shunt trip, undervoltage release, and remote control options for greater flexibility and functionality in protecting transformers.

Enhanced Coordination with Protection Relays:

Compatible with external protection relays incorporates a range of protection features:

27: Under-voltage protection.

46: Negative sequence protection.

50: Instantaneous overcurrent protection.

51/51N: Time-delayed overcurrent protection (phase and ground).

59/59N: Over-voltage protection (phase and ground).

67: Directional overcurrent protection.

79: Auto-reclose functionality.

81O/81U: Over-frequency and under-frequency protection.

94: Antipumping circuit protection.

IDMT Characteristics:

Supports Inverse Definite Minimum Time (IDMT) overcurrent protection curves, compliant with IEC 60255-4 standards.

Binary Inputs:

Out of the 12 binary inputs, 10 inputs are user-programmable, allowing flexibility for customization to meet specific operational requirements.

Up to 5 inputs can be dedicated to non-electric protection functions, enhancing its versatility for non-conventional protection applications.