TECHNICAL SES — LT APFC PANEL SHRI POWER CONTROL SYSTEM Specification for Design, Manufacture, Testing & Supply of Automatic Power Factor Correction (APFC) Panel Project Locations: Murtizapur / Darwha / Mahur / Digras, Maharashtra Application: Industrial, Commercial, Agricultural, Institutional & Utility LT Installations System: 415 V, 3-Phase, 4-Wire, 50 Hz AC 1. Scope of Work Shri Power Control System shall undertake complete: Design and engineering Manufacturing and fabrication Assembly and wiring Supply of APFC panel Factory testing Inspection Documentation Installation support, where specified The APFC panel shall automatically maintain the desired power factor by switching capacitor steps according to the connected load. 2. Electrical Specifications Parameter Specification Rated voltage 415 V AC System 3 Phase, 4 Wire Frequency 50 Hz Power factor target 0.98–0.99 lagging Panel type Floor mounted Installation Indoor / Outdoor as specified Enclosure CRCA sheet steel Protection IP42 minimum indoor / as specified Control supply 230 V AC or suitable Busbar Copper / Aluminium Capacitor Heavy-duty APFC type Capacitor voltage 440/480/525 V as engineering requirement Reactor Optional / mandatory as per harmonic requirement 3. APFC Panel Construction The panel shall be fabricated from good-quality CRCA sheet steel with a rigid frame. The construction shall include: Minimum 2.0 mm sheet-steel enclosure. Suitable base channel. Powder-coated finish. Lockable front doors. Adequate ventilation. Separate power and control wiring routes. Removable gland plates. Proper equipment mounting plates. Adequate space for maintenance. Internal illumination where specified. For outdoor installation, the enclosure and ventilation arrangement shall be upgraded to suit the required environmental/IP conditions. 4. Incomer The panel shall have a suitably rated: MCCB, or ACB for higher-capacity installations. The incomer shall have adequate: Continuous current rating. Short-circuit breaking capacity. Overload protection. Short-circuit protection. The incomer rating shall be finalized based on the total APFC capacity and site fault level. 5. APFC Controller A microprocessor-based APFC relay shall automatically control capacitor steps. Minimum functions: Automatic step switching. Adjustable target PF. Programmable switching sequence. Switching/reconnection delay. Step ON/OFF indication. PF display. Alarm indication. Over-voltage/under-voltage protection. Step failure indication. For advanced projects, the APFC relay may be provided with RS-485/Modbus communication. 6. Capacitor Bank Capacitors shall be suitable for automatic power-factor correction duty. The capacitors shall preferably be: MPP/self-healing type. Heavy-duty construction. Suitable for 50 Hz. Provided with discharge resistors. Provided with safety disconnection. Suitable for the system voltage. Suitable for continuous operation under specified conditions. The final capacitor voltage rating shall be selected considering actual system voltage, harmonics and operating conditions. 7. Capacitor Step Arrangement The APFC bank shall be divided into suitable steps for accurate PF correction. Typical examples: Option A — 100 kVAR 10 + 10 + 20 + 20 + 40 kVAR Option B — 150 kVAR 10 + 20 + 20 + 40 + 60 kVAR Option C — 200 kVAR 10 + 20 + 30 + 40 + 50 + 50 kVAR Option D — 300 kVAR 20 + 20 + 40 + 40 + 60 + 60 + 60 kVAR The final step arrangement shall be selected according to the actual load profile and required PF. 8. Capacitor Duty Contactors Each capacitor step shall be switched through a suitable capacitor-duty contactor. The contactor shall be selected considering: Capacitor switching current. Inrush current. AC-6b duty where applicable. Operating frequency. Required electrical life. Capacitor bank rating. Suitable pre-switching/inrush limiting arrangement shall be provided where required. 9. Detuned Reactors Where harmonics are present, the APFC bank shall be provided with detuned reactors. Possible reactor options: 7% detuned reactor. 14% detuned reactor. Other percentage as determined by harmonic study. The reactor percentage shall be finalized based on the actual harmonic condition of the installation. Detuned reactors shall be adequately rated for continuous current and temperature rise. 10. Individual Step Protection Every capacitor step shall have individual protection using suitable: HRC fuse, or MCCB/MCB as appropriate. The protection shall be coordinated with: Capacitor. Contactor. Reactor, if provided. Main incomer. 11. Busbars Busbars shall be manufactured from high-conductivity: Copper, or Aluminium. They shall be adequately sized for continuous current, temperature rise and short-circuit withstand. Busbars shall be: Properly supported. Colour identified. Insulated/shrouded where required. Mechanically protected. Provided with separate earth bar. 12. CT Arrangement A suitable CT shall be provided for APFC relay sensing. The CT shall have: Correct ratio. Suitable accuracy class. Adequate VA burden. Proper polarity. Shorting arrangement. CT location and polarity shall be checked carefully during commissioning because incorrect CT installation can cause incorrect APFC operation. 13. Digital Meter A digital multifunction meter shall be provided to monitor: Voltage Current kW kVA kVAR Power factor Frequency Where required, the meter shall also display: Voltage THD Current THD Maximum/minimum values 14. Control Wiring Control wiring shall be neatly routed in PVC wiring ducts. Recommended: FRLS/HFFR copper wires. 1.5/2.5 sq.mm minimum as applicable. Ferrules at both ends. Numbered wires. Proper terminal blocks. Separate control/power routing. Proper cable lugs. 15. Indications & Controls The panel shall have suitable: R-Y-B indication lamps. APFC Auto/Manual selector. Capacitor step ON indication. Incomer ON/OFF/TRIP indication. Control supply indication. Alarm indication. Emergency OFF where specified. 16. Cooling & Ventilation Adequate ventilation shall be provided to maintain acceptable internal temperature. Depending upon APFC capacity: Natural ventilation may be used for smaller panels. Filtered cooling fans may be provided for higher-capacity panels. Thermostat-controlled fans may be used. Reactor compartments shall have adequate heat dissipation. 17. Earthing The panel shall have a continuous earth busbar. The following shall be connected to earth: Panel body. Doors. Gland plates. Metallic equipment mounting structures. Reactor/capacitor metallic parts where applicable. Two external earth terminals are recommended. 18. Applicable Standards The APFC panel shall comply with the latest applicable editions/amendments of relevant Indian/IEC standards, including: IS/IEC 61439 — LV switchgear and controlgear assemblies. IS 13340 / IEC 60831 — Shunt power capacitors. IEC 60947 — LV switchgear and controlgear. IS 2705 — Current transformers, where applicable. Applicable CEA safety requirements. Applicable Maharashtra electrical authority/utility requirements. 19. Factory Testing Before dispatch, Shri Power Control System shall conduct routine 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 testing. Interlock testing. Protection verification. 20. Documentation The following documents shall be supplied with the panel: General Arrangement drawing. Single Line Diagram. Control schematic. Capacitor step schedule. Component list/BOM. Panel dimensions. Cable-entry details. Routine Test Certificate. Component datasheets where required. Operation & Maintenance manual. Warranty certificate. 21. Site Coverage This SES is applicable for APFC Panel requirements at: Murtizapur Darwha Mahur Digras Other nearby Maharashtra project locations as specified by the customer. Standard Manufacturer Statement Shri Power Control System shall ensure that all APFC panels are designed, manufactured, assembled and tested according to the approved technical specification, approved drawings and applicable Indian/IEC standards. Component ratings shall be selected based on the actual electrical system parameters, load conditions, fault level and harmonic conditions of each installation. Note: The exact MCCB/ACB rating, busbar size, capacitor size, contactor rating, reactor rating, cable size and panel dimensions should be finalized after the APFC kVAR rating and site load data are available.
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Supply of Automatic Power Factor Correction (APFC) Panel
2026-09-09T12:06:49
TECHNICAL SES — LT APFC PANEL SHRI POWER CONTROL SYSTEM Specification for Design, Manufacture, Testing & Supply of Automatic Power Factor Correction (APFC) Panel Project Locations: Murtizapur / Darwha / Mahur / Digras, Maharashtra Application: Industrial, Commercial, Agricultural, Institutional & Utility LT Installations System: 415 V, 3-Phase, 4-Wire, 50 Hz AC 1. Scope of Work Shri Power Control System shall undertake complete: Design and engineering Manufacturing and fabrication Assembly and wiring Supply of APFC panel Factory testing Inspection Documentation Installation support, where specified The APFC panel shall automatically maintain the desired power factor by switching capacitor steps according to the connected load. 2. Electrical Specifications Parameter Specification Rated voltage 415 V AC System 3 Phase, 4 Wire Frequency 50 Hz Power factor target 0.98–0.99 lagging Panel type Floor mounted Installation Indoor / Outdoor as specified Enclosure CRCA sheet steel Protection IP42 minimum indoor / as specified Control supply 230 V AC or suitable Busbar Copper / Aluminium Capacitor Heavy-duty APFC type Capacitor voltage 440/480/525 V as engineering requirement Reactor Optional / mandatory as per harmonic requirement 3. APFC Panel Construction The panel shall be fabricated from good-quality CRCA sheet steel with a rigid frame. The construction shall include: Minimum 2.0 mm sheet-steel enclosure. Suitable base channel. Powder-coated finish. Lockable front doors. Adequate ventilation. Separate power and control wiring routes. Removable gland plates. Proper equipment mounting plates. Adequate space for maintenance. Internal illumination where specified. For outdoor installation, the enclosure and ventilation arrangement shall be upgraded to suit the required environmental/IP conditions. 4. Incomer The panel shall have a suitably rated: MCCB, or ACB for higher-capacity installations. The incomer shall have adequate: Continuous current rating. Short-circuit breaking capacity. Overload protection. Short-circuit protection. The incomer rating shall be finalized based on the total APFC capacity and site fault level. 5. APFC Controller A microprocessor-based APFC relay shall automatically control capacitor steps. Minimum functions: Automatic step switching. Adjustable target PF. Programmable switching sequence. Switching/reconnection delay. Step ON/OFF indication. PF display. Alarm indication. Over-voltage/under-voltage protection. Step failure indication. For advanced projects, the APFC relay may be provided with RS-485/Modbus communication. 6. Capacitor Bank Capacitors shall be suitable for automatic power-factor correction duty. The capacitors shall preferably be: MPP/self-healing type. Heavy-duty construction. Suitable for 50 Hz. Provided with discharge resistors. Provided with safety disconnection. Suitable for the system voltage. Suitable for continuous operation under specified conditions. The final capacitor voltage rating shall be selected considering actual system voltage, harmonics and operating conditions. 7. Capacitor Step Arrangement The APFC bank shall be divided into suitable steps for accurate PF correction. Typical examples: Option A — 100 kVAR 10 + 10 + 20 + 20 + 40 kVAR Option B — 150 kVAR 10 + 20 + 20 + 40 + 60 kVAR Option C — 200 kVAR 10 + 20 + 30 + 40 + 50 + 50 kVAR Option D — 300 kVAR 20 + 20 + 40 + 40 + 60 + 60 + 60 kVAR The final step arrangement shall be selected according to the actual load profile and required PF. 8. Capacitor Duty Contactors Each capacitor step shall be switched through a suitable capacitor-duty contactor. The contactor shall be selected considering: Capacitor switching current. Inrush current. AC-6b duty where applicable. Operating frequency. Required electrical life. Capacitor bank rating. Suitable pre-switching/inrush limiting arrangement shall be provided where required. 9. Detuned Reactors Where harmonics are present, the APFC bank shall be provided with detuned reactors. Possible reactor options: 7% detuned reactor. 14% detuned reactor. Other percentage as determined by harmonic study. The reactor percentage shall be finalized based on the actual harmonic condition of the installation. Detuned reactors shall be adequately rated for continuous current and temperature rise. 10. Individual Step Protection Every capacitor step shall have individual protection using suitable: HRC fuse, or MCCB/MCB as appropriate. The protection shall be coordinated with: Capacitor. Contactor. Reactor, if provided. Main incomer. 11. Busbars Busbars shall be manufactured from high-conductivity: Copper, or Aluminium. They shall be adequately sized for continuous current, temperature rise and short-circuit withstand. Busbars shall be: Properly supported. Colour identified. Insulated/shrouded where required. Mechanically protected. Provided with separate earth bar. 12. CT Arrangement A suitable CT shall be provided for APFC relay sensing. The CT shall have: Correct ratio. Suitable accuracy class. Adequate VA burden. Proper polarity. Shorting arrangement. CT location and polarity shall be checked carefully during commissioning because incorrect CT installation can cause incorrect APFC operation. 13. Digital Meter A digital multifunction meter shall be provided to monitor: Voltage Current kW kVA kVAR Power factor Frequency Where required, the meter shall also display: Voltage THD Current THD Maximum/minimum values 14. Control Wiring Control wiring shall be neatly routed in PVC wiring ducts. Recommended: FRLS/HFFR copper wires. 1.5/2.5 sq.mm minimum as applicable. Ferrules at both ends. Numbered wires. Proper terminal blocks. Separate control/power routing. Proper cable lugs. 15. Indications & Controls The panel shall have suitable: R-Y-B indication lamps. APFC Auto/Manual selector. Capacitor step ON indication. Incomer ON/OFF/TRIP indication. Control supply indication. Alarm indication. Emergency OFF where specified. 16. Cooling & Ventilation Adequate ventilation shall be provided to maintain acceptable internal temperature. Depending upon APFC capacity: Natural ventilation may be used for smaller panels. Filtered cooling fans may be provided for higher-capacity panels. Thermostat-controlled fans may be used. Reactor compartments shall have adequate heat dissipation. 17. Earthing The panel shall have a continuous earth busbar. The following shall be connected to earth: Panel body. Doors. Gland plates. Metallic equipment mounting structures. Reactor/capacitor metallic parts where applicable. Two external earth terminals are recommended. 18. Applicable Standards The APFC panel shall comply with the latest applicable editions/amendments of relevant Indian/IEC standards, including: IS/IEC 61439 — LV switchgear and controlgear assemblies. IS 13340 / IEC 60831 — Shunt power capacitors. IEC 60947 — LV switchgear and controlgear. IS 2705 — Current transformers, where applicable. Applicable CEA safety requirements. Applicable Maharashtra electrical authority/utility requirements. 19. Factory Testing Before dispatch, Shri Power Control System shall conduct routine 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 testing. Interlock testing. Protection verification. 20. Documentation The following documents shall be supplied with the panel: General Arrangement drawing. Single Line Diagram. Control schematic. Capacitor step schedule. Component list/BOM. Panel dimensions. Cable-entry details. Routine Test Certificate. Component datasheets where required. Operation & Maintenance manual. Warranty certificate. 21. Site Coverage This SES is applicable for APFC Panel requirements at: Murtizapur Darwha Mahur Digras Other nearby Maharashtra project locations as specified by the customer. Standard Manufacturer Statement Shri Power Control System shall ensure that all APFC panels are designed, manufactured, assembled and tested according to the approved technical specification, approved drawings and applicable Indian/IEC standards. Component ratings shall be selected based on the actual electrical system parameters, load conditions, fault level and harmonic conditions of each installation. Note: The exact MCCB/ACB rating, busbar size, capacitor size, contactor rating, reactor rating, cable size and panel dimensions should be finalized after the APFC kVAR rating and site load data are available.
2026-09-09T12:06:49
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