TECHNICAL SES — APFC PANEL SHRI POWER CONTROL SYSTEM Design, Manufacture, Testing & Supply of Automatic Power Factor Correction Panel Project Locations: Buldhana / Mumbai / Sangli, Maharashtra System: 415 V, 3-Phase, 4-Wire, 50 Hz Application: Industrial / Commercial / Institutional LT Electrical Installations 1. Scope of Supply Shri Power Control System shall design, manufacture, assemble, test and supply a complete LT Automatic Power Factor Correction (APFC) Panel, including: Panel enclosure and structure MCCB/ACB incomer Copper/Aluminium busbars APFC relay/controller Capacitor banks Capacitor-duty contactors Detuned reactors, where required Individual capacitor-step protection CTs for APFC sensing Digital multifunction meter Control and indication components Cooling/ventilation system Internal power/control wiring Earthing arrangement Cable glands and accessories Factory testing Drawings and technical documentation 2. Electrical Parameters Particular Specification Rated system voltage 415 V AC Number of phases 3 Phase System 4 Wire Frequency 50 Hz Target power factor 0.98–0.99 lagging Panel type Floor mounted Installation Indoor / Outdoor as specified Enclosure CRCA sheet steel Protection IP42 minimum indoor / as specified Busbar Copper / Aluminium Capacitor type Heavy-duty APFC Reactor 7% / 14% / As per harmonic study Control supply 230 V AC or suitable 3. Panel Construction The APFC panel shall be fabricated using good-quality CRCA sheet steel with a rigid frame. The panel shall include: Minimum 2.0 mm sheet-steel construction. Suitable base channel. Powder-coated finish. Lockable doors. Adequate ventilation. Separate power and control wiring arrangement. Removable cable gland plates. Proper equipment mounting plates. Adequate clearance for maintenance. Proper segregation of capacitor/reactor and control sections wherever required. For outdoor applications, the enclosure shall be suitably upgraded for environmental conditions and specified IP rating. 4. Incomer The panel shall be provided with a suitably rated MCCB or ACB. The incomer shall have adequate: Continuous current rating. Short-circuit breaking capacity. Overload protection. Short-circuit protection. Operating mechanism. ON/OFF/TRIP indication. The incomer rating shall be finalized according to the APFC capacity, system fault level and applicable derating factors. 5. Busbar Busbars shall be made from high-conductivity copper or aluminium. They shall be: Adequately rated for continuous current. Properly supported on suitable insulators. Colour identified. Properly insulated/shrouded where necessary. Designed for required short-circuit withstand. Provided with separate neutral and earth bars where applicable. 6. APFC Relay A microprocessor-based APFC controller shall automatically switch capacitor steps according to system power factor. Minimum features shall include: Automatic capacitor-step switching. Adjustable target PF. Programmable switching sequence. Switching/reconnection delay. Step ON/OFF indication. PF display. Alarm/fault indication. Over-voltage/under-voltage protection. Step failure indication. For projects requiring remote monitoring, the APFC controller may be provided with RS-485/Modbus communication. 7. Capacitor Bank The capacitor bank shall consist of heavy-duty APFC capacitors suitable for continuous operation. Capacitors shall preferably be: MPP/self-healing type. Suitable for 50 Hz. Provided with internal discharge resistors. Provided with safety disconnection arrangement. Suitable for the system voltage. Suitable for frequent switching duty. The capacitor voltage rating shall be selected considering system voltage, operating conditions and harmonics. 8. Capacitor Step Arrangement The total APFC capacity shall be divided into suitable steps to achieve accurate power-factor correction. Typical examples: Total APFC Example Step Arrangement 50 kVAR 5 + 5 + 10 + 10 + 20 100 kVAR 10 + 10 + 20 + 20 + 40 150 kVAR 10 + 20 + 20 + 40 + 60 200 kVAR 10 + 20 + 30 + 40 + 50 + 50 300 kVAR 20 + 20 + 40 + 40 + 60 + 60 + 60 400 kVAR 20 + 40 + 60 + 80 + 100 + 100 The actual step configuration shall be finalized from the connected load, load variation and existing power factor. 9. Capacitor-Duty Contactors Each capacitor step shall be controlled through a suitable capacitor-duty contactor. Contactors shall be selected for: Capacitor switching duty. Inrush current. AC-6b duty where applicable. Required electrical life. Operating frequency. Capacitor/reactor combination. Suitable inrush-current limiting/pre-switching arrangements shall be provided where required. 10. Detuned Reactors Where the electrical system contains significant harmonics, the capacitor bank shall be provided with suitable detuned reactors. Possible selections: 7% detuned reactor 14% detuned reactor Other rating based on harmonic study The reactor selection shall be based on the actual harmonic spectrum and resonance conditions of the installation. 11. Individual Step Protection Each capacitor step shall have independent protection using suitable: HRC fuses, or MCCB/MCB as applicable. Protection shall be properly coordinated with the capacitor, contactor and reactor. 12. CT for APFC Suitable CT shall be provided for APFC relay sensing. The CT shall have: Correct ratio. Suitable accuracy class. Adequate VA burden. Correct polarity. CT shorting arrangement. Properly identified terminals. CT installation and polarity shall be checked during commissioning for correct APFC operation. 13. Digital Meter A digital multifunction meter shall be provided. It shall preferably measure/display: R-Y-B voltage. Line voltage. Current. kW. kVA. kVAR. Power factor. Frequency. For advanced installations: Voltage THD. Current THD. Maximum/minimum values. Communication interface. 14. Control & Indication The panel shall include: R-Y-B phase indication. Control supply indication. Incomer ON/OFF/TRIP indication. APFC Auto/Manual selector. Capacitor step ON indication. Alarm/fault indication. Emergency OFF where required. 15. Control Wiring Control wiring shall be neatly routed through wiring ducts. Recommended: FRLS/HFFR copper wire. 1.5/2.5 sq.mm as applicable. Ferrules at both ends. Wire numbering. Proper terminal blocks. Separate power and control wiring. Proper cable lugs. 16. Cooling Arrangement Adequate ventilation shall be provided based on panel capacity. Depending on the design: Natural ventilation for smaller panels. Filtered cooling fans for larger panels. Thermostat-controlled fans. Separate ventilation for reactor compartments. The design shall prevent excessive temperature rise of capacitors and reactors. 17. Earthing A continuous earth busbar shall be provided. The following shall be bonded to the earth system: Panel body. Doors. Gland plates. Mounting structures. Metallic reactor/capacitor assemblies where applicable. Two external earth studs shall preferably be provided. 18. Applicable Standards The APFC panel shall comply with the latest applicable editions/amendments of relevant standards, including: IS/IEC 61439 — Low-voltage switchgear and controlgear assemblies. IS 13340 / IEC 60831 — Shunt power capacitors. IEC 60947 — Low-voltage switchgear and controlgear. IS 2705 — Current transformers, where applicable. Applicable CEA electrical safety requirements. Applicable Maharashtra electrical utility requirements. 19. Factory Testing Before dispatch, each panel shall undergo routine inspection/testing, including: Visual inspection. Dimensional inspection. Wiring verification. Insulation resistance test. Dielectric/HV test as applicable. Earth continuity test. APFC relay functional test. Auto/manual operation test. Capacitor step switching test. Metering verification. Indication test. Interlock verification. Protection-function verification. 20. Documentation Shri Power Control System shall provide: General Arrangement drawing. Single Line Diagram. Control schematic. Capacitor step schedule. Bill of Materials. Component datasheets where required. Panel dimensions. Cable-entry details. Routine Test Certificate. Operation & Maintenance manual. Warranty certificate. 21. Project Locations This SES shall be applicable for projects at: Buldhana Mumbai Sangli Other Maharashtra locations as specified in the purchase order. Manufacturer's Technical Declaration Shri Power Control System shall manufacture and test the APFC panel in accordance with the approved drawings, approved component specifications and applicable Indian/IEC standards. Final equipment ratings shall be selected according to the actual site electrical parameters, load profile, fault level and harmonic conditions. Engineering note: The exact MCCB/ACB size, capacitor kVAR, step sizes, contactor ratings, reactor ratings, busbar dimensions, cable sizes and panel dimensions should be calculated after the required APFC capacity and site load data are confirmed.
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APFC PANEL
2026-09-09T12:31:22
TECHNICAL SES — APFC PANEL SHRI POWER CONTROL SYSTEM Design, Manufacture, Testing & Supply of Automatic Power Factor Correction Panel Project Locations: Buldhana / Mumbai / Sangli, Maharashtra System: 415 V, 3-Phase, 4-Wire, 50 Hz Application: Industrial / Commercial / Institutional LT Electrical Installations 1. Scope of Supply Shri Power Control System shall design, manufacture, assemble, test and supply a complete LT Automatic Power Factor Correction (APFC) Panel, including: Panel enclosure and structure MCCB/ACB incomer Copper/Aluminium busbars APFC relay/controller Capacitor banks Capacitor-duty contactors Detuned reactors, where required Individual capacitor-step protection CTs for APFC sensing Digital multifunction meter Control and indication components Cooling/ventilation system Internal power/control wiring Earthing arrangement Cable glands and accessories Factory testing Drawings and technical documentation 2. Electrical Parameters Particular Specification Rated system voltage 415 V AC Number of phases 3 Phase System 4 Wire Frequency 50 Hz Target power factor 0.98–0.99 lagging Panel type Floor mounted Installation Indoor / Outdoor as specified Enclosure CRCA sheet steel Protection IP42 minimum indoor / as specified Busbar Copper / Aluminium Capacitor type Heavy-duty APFC Reactor 7% / 14% / As per harmonic study Control supply 230 V AC or suitable 3. Panel Construction The APFC panel shall be fabricated using good-quality CRCA sheet steel with a rigid frame. The panel shall include: Minimum 2.0 mm sheet-steel construction. Suitable base channel. Powder-coated finish. Lockable doors. Adequate ventilation. Separate power and control wiring arrangement. Removable cable gland plates. Proper equipment mounting plates. Adequate clearance for maintenance. Proper segregation of capacitor/reactor and control sections wherever required. For outdoor applications, the enclosure shall be suitably upgraded for environmental conditions and specified IP rating. 4. Incomer The panel shall be provided with a suitably rated MCCB or ACB. The incomer shall have adequate: Continuous current rating. Short-circuit breaking capacity. Overload protection. Short-circuit protection. Operating mechanism. ON/OFF/TRIP indication. The incomer rating shall be finalized according to the APFC capacity, system fault level and applicable derating factors. 5. Busbar Busbars shall be made from high-conductivity copper or aluminium. They shall be: Adequately rated for continuous current. Properly supported on suitable insulators. Colour identified. Properly insulated/shrouded where necessary. Designed for required short-circuit withstand. Provided with separate neutral and earth bars where applicable. 6. APFC Relay A microprocessor-based APFC controller shall automatically switch capacitor steps according to system power factor. Minimum features shall include: Automatic capacitor-step switching. Adjustable target PF. Programmable switching sequence. Switching/reconnection delay. Step ON/OFF indication. PF display. Alarm/fault indication. Over-voltage/under-voltage protection. Step failure indication. For projects requiring remote monitoring, the APFC controller may be provided with RS-485/Modbus communication. 7. Capacitor Bank The capacitor bank shall consist of heavy-duty APFC capacitors suitable for continuous operation. Capacitors shall preferably be: MPP/self-healing type. Suitable for 50 Hz. Provided with internal discharge resistors. Provided with safety disconnection arrangement. Suitable for the system voltage. Suitable for frequent switching duty. The capacitor voltage rating shall be selected considering system voltage, operating conditions and harmonics. 8. Capacitor Step Arrangement The total APFC capacity shall be divided into suitable steps to achieve accurate power-factor correction. Typical examples: Total APFC Example Step Arrangement 50 kVAR 5 + 5 + 10 + 10 + 20 100 kVAR 10 + 10 + 20 + 20 + 40 150 kVAR 10 + 20 + 20 + 40 + 60 200 kVAR 10 + 20 + 30 + 40 + 50 + 50 300 kVAR 20 + 20 + 40 + 40 + 60 + 60 + 60 400 kVAR 20 + 40 + 60 + 80 + 100 + 100 The actual step configuration shall be finalized from the connected load, load variation and existing power factor. 9. Capacitor-Duty Contactors Each capacitor step shall be controlled through a suitable capacitor-duty contactor. Contactors shall be selected for: Capacitor switching duty. Inrush current. AC-6b duty where applicable. Required electrical life. Operating frequency. Capacitor/reactor combination. Suitable inrush-current limiting/pre-switching arrangements shall be provided where required. 10. Detuned Reactors Where the electrical system contains significant harmonics, the capacitor bank shall be provided with suitable detuned reactors. Possible selections: 7% detuned reactor 14% detuned reactor Other rating based on harmonic study The reactor selection shall be based on the actual harmonic spectrum and resonance conditions of the installation. 11. Individual Step Protection Each capacitor step shall have independent protection using suitable: HRC fuses, or MCCB/MCB as applicable. Protection shall be properly coordinated with the capacitor, contactor and reactor. 12. CT for APFC Suitable CT shall be provided for APFC relay sensing. The CT shall have: Correct ratio. Suitable accuracy class. Adequate VA burden. Correct polarity. CT shorting arrangement. Properly identified terminals. CT installation and polarity shall be checked during commissioning for correct APFC operation. 13. Digital Meter A digital multifunction meter shall be provided. It shall preferably measure/display: R-Y-B voltage. Line voltage. Current. kW. kVA. kVAR. Power factor. Frequency. For advanced installations: Voltage THD. Current THD. Maximum/minimum values. Communication interface. 14. Control & Indication The panel shall include: R-Y-B phase indication. Control supply indication. Incomer ON/OFF/TRIP indication. APFC Auto/Manual selector. Capacitor step ON indication. Alarm/fault indication. Emergency OFF where required. 15. Control Wiring Control wiring shall be neatly routed through wiring ducts. Recommended: FRLS/HFFR copper wire. 1.5/2.5 sq.mm as applicable. Ferrules at both ends. Wire numbering. Proper terminal blocks. Separate power and control wiring. Proper cable lugs. 16. Cooling Arrangement Adequate ventilation shall be provided based on panel capacity. Depending on the design: Natural ventilation for smaller panels. Filtered cooling fans for larger panels. Thermostat-controlled fans. Separate ventilation for reactor compartments. The design shall prevent excessive temperature rise of capacitors and reactors. 17. Earthing A continuous earth busbar shall be provided. The following shall be bonded to the earth system: Panel body. Doors. Gland plates. Mounting structures. Metallic reactor/capacitor assemblies where applicable. Two external earth studs shall preferably be provided. 18. Applicable Standards The APFC panel shall comply with the latest applicable editions/amendments of relevant standards, including: IS/IEC 61439 — Low-voltage switchgear and controlgear assemblies. IS 13340 / IEC 60831 — Shunt power capacitors. IEC 60947 — Low-voltage switchgear and controlgear. IS 2705 — Current transformers, where applicable. Applicable CEA electrical safety requirements. Applicable Maharashtra electrical utility requirements. 19. Factory Testing Before dispatch, each panel shall undergo routine inspection/testing, including: Visual inspection. Dimensional inspection. Wiring verification. Insulation resistance test. Dielectric/HV test as applicable. Earth continuity test. APFC relay functional test. Auto/manual operation test. Capacitor step switching test. Metering verification. Indication test. Interlock verification. Protection-function verification. 20. Documentation Shri Power Control System shall provide: General Arrangement drawing. Single Line Diagram. Control schematic. Capacitor step schedule. Bill of Materials. Component datasheets where required. Panel dimensions. Cable-entry details. Routine Test Certificate. Operation & Maintenance manual. Warranty certificate. 21. Project Locations This SES shall be applicable for projects at: Buldhana Mumbai Sangli Other Maharashtra locations as specified in the purchase order. Manufacturer's Technical Declaration Shri Power Control System shall manufacture and test the APFC panel in accordance with the approved drawings, approved component specifications and applicable Indian/IEC standards. Final equipment ratings shall be selected according to the actual site electrical parameters, load profile, fault level and harmonic conditions. Engineering note: The exact MCCB/ACB size, capacitor kVAR, step sizes, contactor ratings, reactor ratings, busbar dimensions, cable sizes and panel dimensions should be calculated after the required APFC capacity and site load data are confirmed.
2026-09-09T12:31:22
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