Technical Standards

• Standard: IEC 60947-2

• Rated Voltage: 415V / 690V

• Rated Current: 630A – 6300A

• Breaking Capacity: Up to 150 kA (Icu)

• Utilization Category: ACB – Category B

Construction

• Draw-out / Fixed type

• Arc chute system (multi-plate arc splitter)

• Microprocessor-based trip unit (LSIG protection)

• Motorized spring charging mechanism

• Interlocking system (mechanical + electrical)

Protection Functions (LSIG)

• Long Time Delay (Overload protection)

• Short Time Delay (Short circuit coordination)

• Instantaneous Protection

• Ground / Earth Fault Protection

Applications

• LV main incomers

• Generator protection

• Transformer LV side protection

• Industrial power systems

Electrical Parameters

• Rated Voltage: 3.3 kV / 6.6 kV / 11 kV / 22 kV / 33 kV

• Rated Frequency: 50 Hz

• Short Circuit Capacity: 25 kA – 50 kA (3 sec)

• Insulation Level: IEC impulse & power frequency withstand

Panel Types

• Metal Clad Switchgear

• Vacuum Circuit Breaker Panels (VCB)

• Ring Main Units (RMU)

• Feeder Protection Panels

Technical Standards

• IEC 62271-100 compliant

• Rated Voltage: 3.3kV – 36kV

• Rated Current: 630A – 3150A

• Breaking Capacity: 25kA / 31.5kA / 40kA / 50kA

Construction

• Vacuum interrupter bottle (ceramic + metal sealing)

• Spring / motor operated mechanism

• Epoxy resin insulated poles

• Withdrawable / fixed design

Protection System

• Numerical protection relay (IED)

• Overcurrent (50/51)

• Earth fault (50N/51N)

• Differential protection (optional)

• Auto reclosing (optional)

Applications

• 11kV / 33kV substations

• Industrial feeders

• Transformer protection

• Utility grid networks

5.1 DG TO DG Synchronization

Electrical Functions:

• Automatic voltage matching (AVR control loop)

• Frequency matching via governor control

• Phase angle synchronization (0° ± 10°)

• Synchronizing check relay (ANSI 25)

• Load sharing via droop / isochronous mode

Load Sharing System:

• Active power (kW) sharing

• Reactive power (kVAr) sharing

• Real-time load balancing (digital controller)

Control System:

• PLC based synchronizing controller

• Digital synchronizing relay

• Breaker interlocking logic

• CANBUS / Modbus communication

5.2 Forward Synchronization (DG → Grid/Bus)

Technical Operation:

• Synchronization with live busbar or grid

• Voltage, frequency, phase matching before breaker close

• Soft closing of circuit breaker

• Load transfer without interruption

Protection:

• Synchronism check relay (25 function)

• Over/under voltage (59/27)

• Over/under frequency (81O/U)

• Phase sequence protection

5.3 Reverse Synchronization (Grid Return / Safe Transfer)

Technical Function:

• Detects grid return condition

• Prevents reverse power flow into generator

• Automatically transfers load back to utility

Protection Features:

• Reverse Power Relay (ANSI 32)

• Anti-islanding protection

• Load transfer interlocking

• Breaker fail-safe logic

5.4 Multi-Mode Synchronization System

Supported Configurations:

• DG + DG + DG (parallel plant)

• DG + Grid

• DG + Solar + BESS

• Full hybrid power plant systems

Functions:

• Automatic source selection

• Load sharing optimization

• Peak shaving mode

• Emergency power management

• Grid import/export control

System Objective & Electrical Parameters

To improve electrical power factor by compensating reactive power (kVAr) and optimizing load efficiency.

• System Voltage: 415V / 440V / 690V

• Frequency: 50 Hz

• Power Factor Target: 0.95 – 0.99

• Step Switching: Automatic / Thyristor based

System Components

APFC Controller

• Microprocessor-based controller

• Real-time PF monitoring

• Automatic capacitor switching logic

Capacitor Banks

• Heavy-duty polypropylene capacitors

• Discharge resistors

• Detuned reactors (for harmonics control)

Switching System

• Capacitor duty contactors

• Thyristor switching modules (fast response)

• Step-wise reactive compensation

Technical Features

• Harmonic filtering capability (3rd, 5th, 7th)

• Automatic step control

• Voltage fluctuation compensation

• Real-time PF correction

Benefits

• Reduction in electricity billing penalties

• Improved transformer loading capacity

• Reduced line losses

• Increased system efficiency

• Enhanced voltage stability

Testing & Quality Standards

All systems undergo:

• IR (Insulation Resistance) Testing

• High Voltage (Hi-Pot) Testing

• Functional Interlock Testing

• Relay Calibration Testing

• Load Simulation Testing

• FAT (Factory Acceptance Test)

• IEC compliance verification

Applications

• Power generation plants

• Industrial manufacturing

• Oil & Gas sector

• Data centers

• Utilities & substations

• Commercial complexes

• Critical infrastructure