TECHNICAL SPECIFICATION — LT APFC PANEL SHRI POWER CONTROL SYSTEM Design, Manufacture, Testing & Supply of Automatic Power Factor Correction (APFC) Panel Project Locations: Wardha / Amravati / Badnera / Ner / Washim, Maharashtra Application: Industrial / Commercial / Institutional LT Electrical Installation System: 415 V, 3 Phase, 4 Wire, 50 Hz AC 1. Scope of Supply Shri Power Control System shall design, manufacture, assemble, test and supply a complete Automatic Power Factor Correction (APFC) Panel suitable for installation at the above project locations. The scope shall include: APFC panel enclosure with suitable compartmental construction. Incoming MCCB/ACB as per panel capacity. Copper/Aluminium busbars of suitable current rating. Microprocessor-based APFC relay/controller. Heavy-duty capacitor banks. Capacitor-duty contactors. Detuned reactors, where required. HRC fuses/MCCBs/MCBs for individual capacitor steps. Digital multifunction meter. CTs for APFC sensing. Auto/Manual selector. Indicating lamps. Control transformer/control MCBs wherever required. Cooling/ventilation arrangement. Internal wiring and terminal blocks. Earthing arrangement. Cable glands and required accessories. Testing and inspection at manufacturer's works. Drawings, test certificates and O& M documents. 2. Electrical System Parameter Specification System voltage 415 V AC Phase 3 Phase Frequency 50 Hz System 3 Phase, 4 Wire APFC target Normally 0.98–0.99 lagging Panel type Indoor, floor-mounted Enclosure CRCA sheet steel Protection Minimum IP42 indoor, or as project requirement Control voltage 230 V AC / suitable control voltage Ambient Suitable for Maharashtra site conditions The final capacitor capacity shall be selected after considering the actual load, existing power factor and required target power factor. 3. Panel Construction The APFC panel shall be fabricated from good-quality CRCA sheet steel with a rigid structural frame. Recommended construction: 2.0 mm CRCA sheet for enclosure/doors. 2.0–3.0 mm gland plate as required. Suitable base channel. Powder-coated finish after proper surface preparation. Separate sections for incomer, control equipment and capacitor/reactor compartments wherever practical. Removable gland plates. Lockable doors. Adequate ventilation. Proper segregation of power and control wiring. Government APFC specifications commonly require compartmentalized, floor-mounted construction and suitable powder-coated CRCA steel construction. QQuickBOQ+1 4. Incomer The APFC panel shall be provided with a suitable: MCCB for smaller/medium ratings. ACB where required for higher ratings. Adjustable overload/short-circuit protection where applicable. Suitable breaking capacity based on site fault level. Door-mounted operating handle. ON/OFF/TRIP indication. R-Y-B phase indication. The incomer rating shall be selected with adequate margin for capacitor current, harmonics and operating conditions. 5. Busbar Busbars shall be adequately rated for continuous current and short-circuit withstand. They shall be: Electrolytic-grade copper or high-conductivity aluminium. Properly supported on SMC/DMC insulators. Colour identified. Fully insulated/shrouded where necessary. Provided with suitable neutral and earth busbars. Busbar sizing shall not be based merely on nominal capacitor kVAR; allowance shall be made for capacitor current, harmonics and temperature. 6. APFC Relay The panel shall have a microprocessor-based automatic power factor controller. Minimum features: Automatic capacitor-step switching. Adjustable target PF. Suitable number of stages according to panel capacity. Programmable switching delay. Reconnection delay. Over/under-voltage protection. Step failure indication. Capacitor switching indication. PF display. Alarm/fault indication. For larger panels, a relay with communication capability such as RS-485/Modbus may be offered where required. Modern specifications also commonly require monitoring of V, A, PF, kW, kVA, kVAR and THD. QQuickBOQ 7. Capacitor Bank Capacitors shall be: Heavy-duty MPP/self-healing type. Suitable for 50 Hz operation. Suitable for the system voltage. Provided with internal discharge resistors. Provided with pressure-sensitive safety/disconnection arrangement. Suitable for APFC duty. Properly mounted with adequate ventilation. For a 415 V system, 525 V capacitor elements are commonly specified where additional voltage margin is required. QQuickBOQ+1 8. Capacitor Steps The capacitor bank shall be divided into suitable steps to obtain smooth PF correction. Typical arrangements may be: 5 + 5 + 10 + 10 + 20 + 20 kVAR 10 + 10 + 20 + 20 + 20 + 40 kVAR 10 + 20 + 20 + 30 + 40 + 50 kVAR Or any other combination determined from the actual load profile. Final step configuration shall be confirmed from the customer's connected load and measured PF. 9. Capacitor Duty Contactors Each capacitor step shall be switched through a suitable capacitor-duty contactor. Contactors shall have: Pre-switching/inrush-current limiting arrangement where applicable. Suitable AC-6b capacitor switching capability. Auxiliary contacts. Adequate thermal/electrical rating. Proper coordination with capacitor protection. Capacitor-duty contactors rated for AC-6b operation are specifically called for in some Indian APFC specifications. GGujarat Agro Industries Corporation 10. Detuned Reactor Where harmonics are present or where specified by the consultant/customer, the APFC bank shall be provided with detuned reactors. The reactor percentage shall be selected based on the harmonic study and system requirements. Typical options include: 7% detuned reactor. 14% detuned reactor. A 7% detuned reactor is used in some specifications, while 14% is also specified for installations requiring greater harmonic detuning. GGujarat Agro Industries Corporation+1 Important: The reactor percentage should not be selected blindly; it should be finalized considering the existing harmonic spectrum and possibility of resonance. 11. Protection Each capacitor step shall have suitable protection by: HRC fuse / MCCB. Capacitor-duty contactor. Reactor protection where applicable. Over-temperature protection where required. Proper short-circuit coordination. The overall panel shall be designed so that failure of one capacitor step does not unnecessarily shut down the complete APFC system. 12. Metering A digital multifunction meter shall preferably display: Phase voltage. Line voltage. Phase current. kW. kVA. kVAR. Power factor. Frequency. THD-V. THD-I. Where harmonic monitoring is not required by the project, a basic multifunction meter may be used. 13. CT Suitable CTs shall be provided for APFC relay sensing. The CT shall be: Correctly positioned at the incomer/source side as required by the APFC scheme. Suitable accuracy class. Adequate VA burden. Properly shortable through CT terminals. Properly identified R/Y/B. CT polarity and location are critical for correct APFC operation. 14. Control Wiring Control wiring shall be neatly routed through wiring ducts. Recommended: FRLS/HFFR copper control cable. Minimum 1.5/2.5 sq.mm as appropriate to the circuit. Ferrules on both ends. Numbered terminal blocks. Separate control and power wiring. Proper cable lugs. Adequate spare terminals. Some current public-sector specifications specify 2.5 sq.mm FRLS/HFFR copper control wiring for APFC panels. QQuickBOQ 15. Earthing The panel shall have a continuous earth busbar. The following shall be properly bonded: Panel body. Doors. Capacitor/reactor compartments. Metallic gland plates. Internal equipment as required. Two external earth studs shall preferably be provided. 16. Applicable Standards The APFC panel shall generally comply with the latest applicable editions/amendments of: 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 where the installation falls under utility-specific specifications. Public-sector APFC specifications explicitly reference IS/IEC 61439, IS 13340/IEC 60831, IEC 60947 and IS 2705 among applicable standards. DDCSEM 17. Factory Testing Each completed APFC panel shall undergo routine inspection/testing including, as applicable: Visual inspection. Dimensional inspection. Wiring verification. Insulation resistance test. HV/dielectric test as applicable. Earth continuity test. Functional testing of APFC relay. Manual/Auto operation test. Capacitor-step switching test. Indication test. Metering test. Interlock verification. Protection-function verification. 18. Documents to be Supplied Shri Power Control System shall provide: General arrangement drawing. Single-line diagram. Control schematic. Component list. Capacitor step schedule. Busbar details. Foundation/mounting details. Cable-entry details. Routine test report. Component datasheets where required. Operation & maintenance manual. Warranty certificate. 19. Site Locations This SES shall be applicable for APFC panel supply/manufacturing requirements at: Wardha Amravati Badnera Ner Washim The final panel rating, capacitor-step configuration, short-circuit rating, enclosure dimensions and harmonic-detuning requirement shall be finalized against the individual site load data and electrical SLD. 20. Recommended APFC Selection Data Sheet For each order, Shri Power Control System can use the following schedule: Description Requirement Customer __________ Project/Site Wardha / Amravati / Badnera / Ner / Washim Supply 415 V, 3 Phase, 4 Wire Frequency 50 Hz Connected Load ____ kW Maximum Demand ____ kW Existing PF ____ Required PF 0.98–0.99 APFC Capacity ____ kVAR Number of Steps ____ Step Configuration ____ Incomer MCCB/ACB ____ A Fault Level ____ kA Capacitor Voltage 525 V recommended where specified Reactor 7% / 14% / As per harmonic study APFC Relay ____ Stage Meter Multifunction Communication RS-485/Modbus – Yes/No Enclosure Indoor / Outdoor IP Rating ____ Paint RAL 7032 / Customer specified Cable Entry Bottom / Top Make of Components As approved Testing Routine/FAT Warranty As per PO Important note for Shri Power Control System For Wardha, Amravati, Badnera, Ner and Washim, I would recommend making this a company-standard SES, and then preparing a separate GA drawing + SLD + BOM + quotation for each APFC rating (for example 50, 100, 150, 200, 250, 300, 400 and 500 kVAR). For Maharashtra utility-related work, the applicable MSEDCL specification should be checked when the APFC system is part of an MSEDCL/HT installation; MSEDCL has its own technical specification for HT automatically switched capacitor banks. MMSEDCL If you give me the APFC panel capacity (e.g. 100/150/200/250/300 kVAR), I can next prepare the complete Shri Power Control System SES + BOM with exact capacitor steps, MCCB size, contactor sizes, reactor sizes, busbar size, cable sizes and panel dimensions.
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Power Control System for manufacture and supply of LT APFC Panels for projects in Wardha, Amravati,
2026-09-09T11:52:18
TECHNICAL SPECIFICATION — LT APFC PANEL SHRI POWER CONTROL SYSTEM Design, Manufacture, Testing & Supply of Automatic Power Factor Correction (APFC) Panel Project Locations: Wardha / Amravati / Badnera / Ner / Washim, Maharashtra Application: Industrial / Commercial / Institutional LT Electrical Installation System: 415 V, 3 Phase, 4 Wire, 50 Hz AC 1. Scope of Supply Shri Power Control System shall design, manufacture, assemble, test and supply a complete Automatic Power Factor Correction (APFC) Panel suitable for installation at the above project locations. The scope shall include: APFC panel enclosure with suitable compartmental construction. Incoming MCCB/ACB as per panel capacity. Copper/Aluminium busbars of suitable current rating. Microprocessor-based APFC relay/controller. Heavy-duty capacitor banks. Capacitor-duty contactors. Detuned reactors, where required. HRC fuses/MCCBs/MCBs for individual capacitor steps. Digital multifunction meter. CTs for APFC sensing. Auto/Manual selector. Indicating lamps. Control transformer/control MCBs wherever required. Cooling/ventilation arrangement. Internal wiring and terminal blocks. Earthing arrangement. Cable glands and required accessories. Testing and inspection at manufacturer's works. Drawings, test certificates and O& M documents. 2. Electrical System Parameter Specification System voltage 415 V AC Phase 3 Phase Frequency 50 Hz System 3 Phase, 4 Wire APFC target Normally 0.98–0.99 lagging Panel type Indoor, floor-mounted Enclosure CRCA sheet steel Protection Minimum IP42 indoor, or as project requirement Control voltage 230 V AC / suitable control voltage Ambient Suitable for Maharashtra site conditions The final capacitor capacity shall be selected after considering the actual load, existing power factor and required target power factor. 3. Panel Construction The APFC panel shall be fabricated from good-quality CRCA sheet steel with a rigid structural frame. Recommended construction: 2.0 mm CRCA sheet for enclosure/doors. 2.0–3.0 mm gland plate as required. Suitable base channel. Powder-coated finish after proper surface preparation. Separate sections for incomer, control equipment and capacitor/reactor compartments wherever practical. Removable gland plates. Lockable doors. Adequate ventilation. Proper segregation of power and control wiring. Government APFC specifications commonly require compartmentalized, floor-mounted construction and suitable powder-coated CRCA steel construction. QQuickBOQ+1 4. Incomer The APFC panel shall be provided with a suitable: MCCB for smaller/medium ratings. ACB where required for higher ratings. Adjustable overload/short-circuit protection where applicable. Suitable breaking capacity based on site fault level. Door-mounted operating handle. ON/OFF/TRIP indication. R-Y-B phase indication. The incomer rating shall be selected with adequate margin for capacitor current, harmonics and operating conditions. 5. Busbar Busbars shall be adequately rated for continuous current and short-circuit withstand. They shall be: Electrolytic-grade copper or high-conductivity aluminium. Properly supported on SMC/DMC insulators. Colour identified. Fully insulated/shrouded where necessary. Provided with suitable neutral and earth busbars. Busbar sizing shall not be based merely on nominal capacitor kVAR; allowance shall be made for capacitor current, harmonics and temperature. 6. APFC Relay The panel shall have a microprocessor-based automatic power factor controller. Minimum features: Automatic capacitor-step switching. Adjustable target PF. Suitable number of stages according to panel capacity. Programmable switching delay. Reconnection delay. Over/under-voltage protection. Step failure indication. Capacitor switching indication. PF display. Alarm/fault indication. For larger panels, a relay with communication capability such as RS-485/Modbus may be offered where required. Modern specifications also commonly require monitoring of V, A, PF, kW, kVA, kVAR and THD. QQuickBOQ 7. Capacitor Bank Capacitors shall be: Heavy-duty MPP/self-healing type. Suitable for 50 Hz operation. Suitable for the system voltage. Provided with internal discharge resistors. Provided with pressure-sensitive safety/disconnection arrangement. Suitable for APFC duty. Properly mounted with adequate ventilation. For a 415 V system, 525 V capacitor elements are commonly specified where additional voltage margin is required. QQuickBOQ+1 8. Capacitor Steps The capacitor bank shall be divided into suitable steps to obtain smooth PF correction. Typical arrangements may be: 5 + 5 + 10 + 10 + 20 + 20 kVAR 10 + 10 + 20 + 20 + 20 + 40 kVAR 10 + 20 + 20 + 30 + 40 + 50 kVAR Or any other combination determined from the actual load profile. Final step configuration shall be confirmed from the customer's connected load and measured PF. 9. Capacitor Duty Contactors Each capacitor step shall be switched through a suitable capacitor-duty contactor. Contactors shall have: Pre-switching/inrush-current limiting arrangement where applicable. Suitable AC-6b capacitor switching capability. Auxiliary contacts. Adequate thermal/electrical rating. Proper coordination with capacitor protection. Capacitor-duty contactors rated for AC-6b operation are specifically called for in some Indian APFC specifications. GGujarat Agro Industries Corporation 10. Detuned Reactor Where harmonics are present or where specified by the consultant/customer, the APFC bank shall be provided with detuned reactors. The reactor percentage shall be selected based on the harmonic study and system requirements. Typical options include: 7% detuned reactor. 14% detuned reactor. A 7% detuned reactor is used in some specifications, while 14% is also specified for installations requiring greater harmonic detuning. GGujarat Agro Industries Corporation+1 Important: The reactor percentage should not be selected blindly; it should be finalized considering the existing harmonic spectrum and possibility of resonance. 11. Protection Each capacitor step shall have suitable protection by: HRC fuse / MCCB. Capacitor-duty contactor. Reactor protection where applicable. Over-temperature protection where required. Proper short-circuit coordination. The overall panel shall be designed so that failure of one capacitor step does not unnecessarily shut down the complete APFC system. 12. Metering A digital multifunction meter shall preferably display: Phase voltage. Line voltage. Phase current. kW. kVA. kVAR. Power factor. Frequency. THD-V. THD-I. Where harmonic monitoring is not required by the project, a basic multifunction meter may be used. 13. CT Suitable CTs shall be provided for APFC relay sensing. The CT shall be: Correctly positioned at the incomer/source side as required by the APFC scheme. Suitable accuracy class. Adequate VA burden. Properly shortable through CT terminals. Properly identified R/Y/B. CT polarity and location are critical for correct APFC operation. 14. Control Wiring Control wiring shall be neatly routed through wiring ducts. Recommended: FRLS/HFFR copper control cable. Minimum 1.5/2.5 sq.mm as appropriate to the circuit. Ferrules on both ends. Numbered terminal blocks. Separate control and power wiring. Proper cable lugs. Adequate spare terminals. Some current public-sector specifications specify 2.5 sq.mm FRLS/HFFR copper control wiring for APFC panels. QQuickBOQ 15. Earthing The panel shall have a continuous earth busbar. The following shall be properly bonded: Panel body. Doors. Capacitor/reactor compartments. Metallic gland plates. Internal equipment as required. Two external earth studs shall preferably be provided. 16. Applicable Standards The APFC panel shall generally comply with the latest applicable editions/amendments of: 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 where the installation falls under utility-specific specifications. Public-sector APFC specifications explicitly reference IS/IEC 61439, IS 13340/IEC 60831, IEC 60947 and IS 2705 among applicable standards. DDCSEM 17. Factory Testing Each completed APFC panel shall undergo routine inspection/testing including, as applicable: Visual inspection. Dimensional inspection. Wiring verification. Insulation resistance test. HV/dielectric test as applicable. Earth continuity test. Functional testing of APFC relay. Manual/Auto operation test. Capacitor-step switching test. Indication test. Metering test. Interlock verification. Protection-function verification. 18. Documents to be Supplied Shri Power Control System shall provide: General arrangement drawing. Single-line diagram. Control schematic. Component list. Capacitor step schedule. Busbar details. Foundation/mounting details. Cable-entry details. Routine test report. Component datasheets where required. Operation & maintenance manual. Warranty certificate. 19. Site Locations This SES shall be applicable for APFC panel supply/manufacturing requirements at: Wardha Amravati Badnera Ner Washim The final panel rating, capacitor-step configuration, short-circuit rating, enclosure dimensions and harmonic-detuning requirement shall be finalized against the individual site load data and electrical SLD. 20. Recommended APFC Selection Data Sheet For each order, Shri Power Control System can use the following schedule: Description Requirement Customer __________ Project/Site Wardha / Amravati / Badnera / Ner / Washim Supply 415 V, 3 Phase, 4 Wire Frequency 50 Hz Connected Load ____ kW Maximum Demand ____ kW Existing PF ____ Required PF 0.98–0.99 APFC Capacity ____ kVAR Number of Steps ____ Step Configuration ____ Incomer MCCB/ACB ____ A Fault Level ____ kA Capacitor Voltage 525 V recommended where specified Reactor 7% / 14% / As per harmonic study APFC Relay ____ Stage Meter Multifunction Communication RS-485/Modbus – Yes/No Enclosure Indoor / Outdoor IP Rating ____ Paint RAL 7032 / Customer specified Cable Entry Bottom / Top Make of Components As approved Testing Routine/FAT Warranty As per PO Important note for Shri Power Control System For Wardha, Amravati, Badnera, Ner and Washim, I would recommend making this a company-standard SES, and then preparing a separate GA drawing + SLD + BOM + quotation for each APFC rating (for example 50, 100, 150, 200, 250, 300, 400 and 500 kVAR). For Maharashtra utility-related work, the applicable MSEDCL specification should be checked when the APFC system is part of an MSEDCL/HT installation; MSEDCL has its own technical specification for HT automatically switched capacitor banks. MMSEDCL If you give me the APFC panel capacity (e.g. 100/150/200/250/300 kVAR), I can next prepare the complete Shri Power Control System SES + BOM with exact capacitor steps, MCCB size, contactor sizes, reactor sizes, busbar size, cable sizes and panel dimensions.
2026-09-09T11:52:18
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