A 121-unit integrated MV/LV distribution package using KYN28-24 switchgear, SCB14 dry-type transformers, MIC-P LV panels, 1,380 kvar compensation and 82 sub-distribution boxes for continuous textile production.
Project Background
A large-scale textile and garment manufacturing facility in Indonesia required a complete factory-wide power distribution system. The facility covers sewing lines, cutting rooms, heat transfer stations, compressor rooms, canteen, office buildings and auxiliary areas, all requiring stable power, reactive compensation and emergency transfer capability.
The utility system operates at 20kV, while the project design required 24kV insulation class equipment. ZY POWER supplied the medium-voltage intake, dry-type transformers, low-voltage main distribution and 82 downstream distribution boxes as one coordinated package.
Match Indonesian 20kV utility requirements while using 24kV insulation class equipment.
Provide 4.5MVA total transformer capacity for 24/7 textile manufacturing loads.
Maintain power factor above 0.95 through distributed reactive compensation.
Reduce site commissioning risk through factory-tested and pre-labelled equipment.
20kV utility supply
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v
KYN28-24 MV switchgear, 5 panels
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+-----------------------+
| |
v v
SCB14 2500kVA SCB14 2000kVA
20/0.4kV 20/0.4kV
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+-----------+-----------+
|
v
MIC-P LV main distribution, 31 panels
Incomers / feeders / ATS x 2 / PFC x 5
PFC total: 1,380 kvar
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v
XL-21 sub-distribution boxes, 82 units
Sewing / cutting / office / HVAC / fire pump / auxiliary loads| Item | Specification |
|---|---|
| MV switchgear | KYN28-24 indoor metal-clad withdrawable switchgear, 5 panels, 1250A busbar, 25kA / 3s |
| Transformer 1 | SCB14-2500/20 cast-resin dry-type transformer, Dyn11, Class F insulation |
| Transformer 2 | SCB14-2000/20 cast-resin dry-type transformer, Dyn11, Class F insulation |
| LV main distribution | MIC-P fixed separation switchgear, 31 panels, 1,200mm cabinet depth |
| Reactive compensation | 5 automatic PFC cabinets, total 1,380 kvar |
| Dual power supply | XMP-type automatic transfer switch, 2 sets |
| Sub-distribution | XL-21 distribution boxes, 82 units, IP43 / IP54 outdoor units |
| DC supply | SJ38A-32AH / DC 110V for MV control and protection |
| Component brand | Delixi LV components, project-approved configuration |
The two SCB14 transformers, rated 2,500kVA and 2,000kVA, created high LV secondary current. Standard 1,000mm LV cabinets would have made large-section cable bending and termination difficult.
Solution
The MIC-P LV panels were built with 1,200mm cabinet depth, giving more cable routing space and reducing termination stress during installation.
The Indonesian utility system operates at 20kV, while the design specification required a 24kV insulation class for safety margin and future-proofing.
Solution
KYN28-24 switchgear was selected. It provides 24kV insulation capability while operating on the 20kV system, with protection settings calibrated for the actual operating voltage.
Textile production loads include motors, compressors, lighting, HVAC and office electronics. A single centralized PFC cabinet could lead to over-compensation or under-compensation under changing load conditions.
Solution
Five PFC cabinets were distributed across the LV bus sections, providing 1,380 kvar total compensation with automatic capacitor bank switching to maintain power factor above 0.95.
The end client initially discussed CE or Indonesian SNI certification. Full third-party retesting would have increased the schedule risk.
Solution
The project used 3C-compliant main MV/LV equipment and CE-marked LV components where required. This compliance pathway was accepted for the project scope after technical review.
The factory required 82 XL-21 distribution boxes across production lines, offices, canteen, fire systems, HVAC, parking and auxiliary areas. Protection selectivity had to be coordinated across many feeder levels.
Solution
Upstream MCCB settings were cascaded for discrimination, and every XL-21 box was factory-assembled with pre-labelled terminal blocks matching the site cable schedule.
The project required indoor transformer installation, fire-safe insulation, low maintenance and stable operation for continuous textile production. SCB14 provided a high-efficiency cast-resin option with suitable capacity range and loss performance.
Using 24kV insulation class on a 20kV operating system provided additional insulation margin and aligned with standard KYN28-24 equipment configuration without creating a major cost penalty.
The PFC capacity represented about 30.7% of total transformer capacity. This ratio matched the mixed motor, lighting and auxiliary load profile while maintaining a target power factor of at least 0.95.
The larger transformer capacity increased LV cable size. A deeper cabinet reduced cable bending stress, improved termination access and reduced the chance of field modification during installation.
Confirm utility voltage, total capacity, production zones and compliance expectations.
Review 20kV / 24kV coordination, transformer capacity and LV feeder schedule.
Select KYN28-24, SCB14 transformers, MIC-P LV panels, PFC and XL-21 distribution boxes.
Manufacture 121 units with cabinet depth, labels and protection settings matched to project drawings.
Complete routine tests, wiring checks, insulation checks and functional verification before shipment.
Pack and ship MV/LV switchgear, transformers and sub-distribution boxes as an integrated package.
Client local team completed site commissioning without design rework.
Using a 24kV insulation class on a 20kV utility system provided additional insulation margin without changing the operating voltage philosophy.
Planning cable routing space during cabinet design reduced the risk of field modification during installation.
Distributed reactive compensation is often more practical than a single centralized PFC system for factories with mixed production and auxiliary loads.
Pre-labelled sub-distribution boxes reduce commissioning risk when a project contains many feeder destinations across multiple factory zones.
MV and LV panels passed routine factory inspection before shipment.
Single-line logic, feeder allocation and cabinet quantities were reviewed before production.
5 MV panels, 31 LV panels and 82 XL-21 boxes were supplied as one integrated package.
3C-compliant main equipment and CE-marked LV components were accepted for the project scope.
| Standard | Scope | Project relevance |
|---|---|---|
| IEC 62271-200 | AC metal-enclosed switchgear above 1kV | KYN28-24 MV switchgear design basis |
| IEC 60076-11 | Dry-type power transformers | SCB14 transformer specification |
| IEC 61439-2 | LV switchgear and controlgear assemblies | MIC-P LV panel design |
| IEC 61921 | Low-voltage power factor correction banks | 1,380 kvar PFC system |
| GB/T 3906 | 3.6kV to 40.5kV AC metal-enclosed switchgear | KYN28 Chinese standard alignment |
| GB 20052 | Energy efficiency for distribution transformers | SCB14 efficiency reference |
This case study documents an actual ZY POWER equipment delivery. Customer-identifiable details are anonymized for commercial confidentiality.
Indoor cast-resin transformer for industrial distribution rooms.
Metal-clad MV switchgear for incoming and transformer feeder panels.
LV switchgear option for main distribution and feeder systems.
Fixed LV distribution panel for economical feeder applications.
RFQ Checklist
Send the available load list, voltage level, transformer capacity, feeder schedule, room layout and compliance requirements. If the drawing is incomplete, ZY POWER can review the available information before quotation.