General
Application
Environmental
Standards
Csp single phase pole mounted transformer is a completely self-protected distribution unit combining transformer, primary protection and secondary overcurrent control within a compact pole-top enclosure. integrated high-voltage fuse link, surge arrester and low-voltage breaker coordinate with the core-and-coil design to limit faults and overloads. factory-assembled accessories, grounding provisions and bushings reduce external wiring, simplify installation and help utilities standardize hardware, while the sealed tank and corrosion-resistant finish support long, low-maintenance service life and stable voltage performance under varying feeder conditions.
CSP single phase pole mounted transformers are applied on overhead distribution networks supplying dispersed residential, agricultural, and light commercial loads where compact, self-protected equipment simplifies line design. Integrated interruption and surge protection allow engineers to minimize upstream protective devices, improve coordination, and reduce nuisance outages. These units are suitable for rural extensions, service to remote pumps, telecom sites, and roadside assets, helping customers lower construction cost, shorten installation time, standardize fleet maintenance practices, and streamline overall spare equipment management tasks.
Application:outdoor installation.
Ambient temperature: -50°C to +40°C
Relative humidity: ≤90% (at 25°C); ambient air RH <93%.
Altitude: ≤1000 m above sea level.
Max wind speed: ≤35 m/s.
Seismic withstand: Horizontal ≤0.3 g; Vertical ≤0.15 g.
Special conditions: Custom-built solutions available for project-specific requirements.
Ambient temperature: -50°C to +40°C
Relative humidity: ≤90% (at 25°C); ambient air RH <93%.
Altitude: ≤1000 m above sea level.
Max wind speed: ≤35 m/s.
Seismic withstand: Horizontal ≤0.3 g; Vertical ≤0.15 g.
Special conditions: Custom-built solutions available for project-specific requirements.
IEEE/ANSI C57.12.00 – General requirements for liquid-immersed distribution transformers.
IEEE/ANSI C57.12.20 – Overhead-type distribution transformers, 500 kVA and smaller.
IEEE/ANSI C57.12.90 – Test code for liquid-immersed distribution and power transformers.
IEEE/ANSI C57.12.39 – Tank pressure coordination for liquid-immersed distribution transformers.
IEEE/ANSI C57.12.80 – Standard terminology for power and distribution transformers.
ANSI C84.1 – Voltage ratings and tolerances for 60 Hz power systems and equipment.
IEEE/ANSI C57.12.20 – Overhead-type distribution transformers, 500 kVA and smaller.
IEEE/ANSI C57.12.90 – Test code for liquid-immersed distribution and power transformers.
IEEE/ANSI C57.12.39 – Tank pressure coordination for liquid-immersed distribution transformers.
IEEE/ANSI C57.12.80 – Standard terminology for power and distribution transformers.
ANSI C84.1 – Voltage ratings and tolerances for 60 Hz power systems and equipment.
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Why Choose Kerun Intelec
Choose us for precision-engineered transformers—superior efficiency, global certifications, 24/7 support, and tailored solutions. Trusted durability, energy-saving innovation, ensuring optimal performance and longevity worldwide.
Fast Lead Times
Our made-to-order production timelines are highly competitive and as low as 8 weeks from order to delivery.
Design Conformance
We maintain rigorous oversight to ensure every transformer adheres precisely to your exact specifications.
Comprehensive Warranty
We stand behind the longevity and reliability of our products with a robust warranty that covers both materials and workmanship.
Competitive Pricing
We deliver exceptional value so you receive top-tier, reliable, high-quality products without the premium price tag
Exceptional Quality
We implement strict quality control measures at every stage of production to ensure our products meet or exceed industry standards.
Dedicated Support
Our support team is always at your service.Offering expert guidance from initial inquiry through post-installation support.
Transformer Features
CSP single-phase pole-mounted transformer delivering efficient, low-loss distribution, integrated protection, and reliable service for utility networks.
Flexible Design - Well-matched to a Range of Applications.
CSP single‑phase pole transformers accept dual voltage reconnect, standard HV/LV bushings, and various mounting options, allowing seamless integration into rural, residential, farm or light‑commercial distribution networks.
Space Saving – Effective, Flexible Layout
Pole‑mount installation elevates the transformer off ground, eliminating foundation or pad requirements and freeing valuable land — ideal for constrained rights‑of‑way or scattered rural distribution layouts.
Laborsaving – Reduction of Manpower
Pre-integrated protection, bushings, and grounding reduce assembly steps and eliminate many external accessories, cutting installation hours and lowering labor costs for utilities or contractors.
Energy Saving – Reduced Operating Costs
Low-loss core material and optimized winding design minimize no‑load and load losses, boosting efficiency and lowering long-term energy waste for end users. .
High Reliability – Long-term, Trouble-free Operation
Robust oil‑filled tank, sealed bushings and sturdy enclosure withstand harsh outdoor conditions and ensure decades of stable service with minimal failure risk.
Safe Design – Ensures Operator’s Safety
Elevated positioning and integrated grounding/bushing design minimize accidental contact and improve safety during operation and maintenance, especially in overhead distribution environments.
Minimal Maintenance – Reduced Maintenance Costs
Durable construction and self‑contained protection reduce routine maintenance needs. Oil‑filled, sealed tank and standard bushings help ensure low upkeep frequency and cost.
Standard Feature
Mild Steel Tank with Welded Lifting Lugs and Hanger Brackets
LV Circuit Breaker with Reset (overload Indicator Light Provided)
Aluminum Windings
High Voltage Surge Arrester
Amorphous Alloy Core
Expulsion Fuse（elsp Fuse）
HV Bushing(S) (eye Bolt Built-in Flexible Wire)
Earthing Device (with LV Neutral Grounding Strap)
LV Bushing (eyebolt or Spade-type Terminals)
Nameplate
Oil Level Indicator
Envirotemp™ FR3™ Fluid.
Pressure Relief Valve
Meets Doe Energy Efficiency Standard
Optional Features
Copper windings
Tap changer
Low Voltage Surge Arrester
Drain and sampling valve
bushing with double hang erbracket configuration
Standard Birdguard
Stencils and labels according to customer requirements.
About Protection Equipment
Kerun offers four basic transformer types: S, SP, CP and CSP®. together they represent a wide range of protective capabilities to meet nearly every application.
| CSP | CP | SP | S | |
|---|---|---|---|---|
|
Protective Devices
|
Is It Equipped with Protective Devices?
|
|||
| Low Voltage Circuit Breaker | Yes | Yes | NO | No |
| High Voltage Surge Arrester | Yes | NO | Yes | No |
| High Voltage Protective Link | Yes | Yes | Yes | No |
Conventional “S” Transformers
This type transformer contains no protection equipment.therefore, lightning, fault and overload protection for these transformers must be provided by purchaserinstalled, auxiliary protective devices.
Conventional “S” with Protective Link
The protective link is the least expensive device mounted in the transformer to protect the system from a defective transformer.whenever there is an internal failure theresulting fault current will cause the protective link to blow, isolating the transformer from the primary feeder.
Surge-protecting “SP” Transformers
“SP” transformers have transformer-mounted lightning arresters and internal high-voltage protective links, but no internal low-voltage breaker. they are used where lightning is a concern. the protective link only clears faults from internal transformer failure, so any required overload protection must be provided by external fuses.
Current-protecting “CP” Transformers
“CP” transformers have an internal low-voltage circuit breaker and high-voltage protective links, but no built-in lightning arresters. they are applied where lightning exposure is low, with optional crossarm-mounted arresters if surge protection is needed. the breaker and link are coordinated so secondary faults trip the breaker first, removing load and helping protect the core and coils from damage.
Class Designations
The drawing details configurations for various voltage and capacity specifications, ensuring precise customization for diverse application requirements.
Type CSP®, Above 5 KV, 5-100 KVA
Class A
Two fully-insulated high voltage bushings, two arresters, two protective links and external breaker handle. suitable for application on either wye or delta distribution systems. single-position pole mounting in accordance with latest ansi standards.
Class B-1
Two fully-insulated high voltage bushings, one arrester, two protective links and external breaker handle. normally applied on solidly grounded systems.
Class B-2
One fully-insulated high voltage bushing, one arrester, one protective link and external breaker handle. suitable only for application on solidly grounded distribution systems. single-position pole mounting in accordance with latest ansi standards.
Class B-3
Same as class b-2 except with two-position mounting. on 5 through 50 kva only.
Similar to Type CSP® above 5 kV except
Sidewall-mounted primary bushings.
Class b-2 and b-3 not available.
Type S, above 5 KV, 5-500 kVA
Class A
Two fully-insulated high voltage bushings, suitable for application on either wye or delta distribution systems. single-position pole mounting in accordance with the latest ansi standards.
Class B-2
One fully-insulated high voltage bushing, suitable only for application on solidly grounded distribution systems. single-position pole mounting in accordance with the latest ansi standards.
Class B-3
Same as class b-2 except with two-position mounting. on 5 through 50 kva only.
Similar to Type S Above 5 KV, Except
Sidewall-mounted primary bushings.
Only class a is available.
Design Drawings
The drawing details configurations for various voltage and capacity specifications, ensuring precise customization for diverse application requirements.
5kVA-csp-Pole-Mounted-Transformer-drawing
10kVA-csp-Pole-Mounted-Transformer-drawing
15kVA-csp-Pole-Mounted-Transformer-drawing
CSP Single Phase Pole Mounted Transformer Accessories Include
High-voltage bushing
Low-Voltage Bushing
Terminal connector
Grounding terminal
Surge arrester
Elsp Fuse
Current-limiting fuse
Secondary circuit breaker
Overload signal light
Pressure relief device
Breaker operating handle
Tap changer
Transformer oil
Oil level indicator
Oil Temperature Indicator
Tank cover
Sealing gasket
Tank lifting lugs
Pole mounting brackets
Radiators
Nameplate
Bird guard
Neutral grounding strap
About Construction
Robust oil-immersed construction with precision-fabricated steel enclosure and engineered internals ensures low losses, quiet operation, long service life.
01
Tanks
02
Radiator
03
Core
04
Coils
05
Active Part
Tanks
The CSP single phase pole mounted transformer uses a mild steel tank fabricated by precision robotic welding for consistent strength and leak integrity. custom dimensions and wall thicknesses accommodate special layouts integrated lifting lugs, hanger brackets, and reserved areas for future accessory installation. optional galvanizing and tailored powder-coat thickness and colors enhance corrosion resistance , extend overall service life and support site-specific branding.
Mild Steel Tank Provides Robust Mechanical Strength and Stability.
Precision Robotic Welding Ensures Uniform Seams and Leak-free Service.
Radiator
Radiators for the CSP single phase pole mounted transformer are available as tank-welded or detachable assemblies, fabricated from cold-rolled steel for efficient heat dissipation and mechanical strength. Automatic robotic welding delivers uniform, leak-tight seams. Coatings match the tank system for consistent corrosion resistance. Radiator height, section count and fin spacing are fully customizable to meet specific loading and ambient conditions.
Radiator assemblies selectable as welded-on or bolted-on types.
Coating system matched to tank, including optional hot dip galvanizing.
Core
The CSP single phase pole mounted transformer employs a high-grade amorphous alloy wound core manufactured from thin ribbons using a fully automatic transverse cutting line with servo-controlled accuracy.The amorphous material delivers very low no-load losses, reduced magnetizing current and lower operating temperature, improving efficiency and extending insulation life while supporting compact designs and long-term, energy-efficient distribution service for utilities worldwide.
High-grade grain-oriented silicon-steel core significantly minimizes no-load losses.
Tight stacking factor improves performance and reduces active part size.
Coils
The CSP single phase pole mounted transformer uses copper or aluminum conductors for both HV and LV windings, with LV also available in copper or aluminum foil designs to optimize short-circuit strength and axial cooling. Insulation systems can be specified with DMD, Nomex® or Weidmann papers, enabling coordinated thermal class selection and reliable overall dielectric performance over long service life.
HV/LV Winding materials:Cu/Al wire.LV also available in Cu/Al foil.
Insulation materials: optional DMD, Nomex®, or Weidmann.
Active Part
The Active Part of the CSP Single-Phase Pole-Mounted Transformer is composed of a low-loss core, precision-wound coils, and a rigid clamping structure. This configuration ensures optimal flux density, uniform current distribution, and high dielectric strength. The design minimizes noise and leakage, with superior lightning impulse withstand capacity, delivering reliable, efficient performance for long-term, high-load applications.
Rigid Clamping Structure: Ensures coil stability and long-term performance.
Low-Loss Core: Efficient energy conversion with minimal core losses.
About Accessories
Engineered CSP single-phase pole-mounted transformer accessories enhance protection, monitoring, safety and performance, optimizing reliability, maintenance efficiency, and lifetime operating costs.
01
HV Bushings
02
LV Bushings
03
Tap Changers
04
Oil Level Indicator
05
Pressure Relief Valve
06
LV circuit breaker with reset
07
HV Surge Arrester
08
LV Surge Arrester
09
Elsp Fuse
10
Earthing device
11
Nameplate
HV bushings
The CSP single-phase pole-mounted transformer’s HV bushings feature an eye bolt built-in flexible wire design, ensuring reliable electrical connection. customizable with galvanized coatings and adjustable creepage distances, these bushings meet ansi standards for durability and safety. they offer excellent resistance to environmental stress, providing long-term, stable performance in diverse outdoor conditions, enhancing transformer reliability.
Customizable voltage ratings for specific applications 5kV to 34.5kV.
Optional integrated bird guard prevents wildlife-induced outages.
LV bushing
The LV bushing for the CSP single-phase pole-mounted transformer offers optional eyebolts or spade-type terminals, with an alternative bushing featuring a double hanger bracket configuration. Customizable with zinc-plated finishes, these bushings meet ANSI standards, ensuring reliable performance in demanding environments. The design enhances electrical connectivity, durability, and ease of installation while providing robust mechanical support.
Optional 600V or 5kV ratings for specific system coordination needs.
ANSI Standard Compliance: Meets industry standards for safety and reliability.
Tap changer
The CSP single-phase pole-mounted transformer features a customizable tap changer with precision-coated contacts for enhanced durability and reliability. The tap range is adjustable according to the overall design, allowing flexible voltage regulation. This ensures optimal performance, reduces wear, and improves efficiency, making it suitable for long-term operation in varying load conditions while maintaining consistent output.
Plated Contact Surfaces: Enhances conductivity and extends operational lifespan.
Adjustable Tap Range: Configurable tap range based on specific design needs.
Oil Level Indicator
The CSP single-phase pole-mounted transformer features an oil level indicator, providing clear, real-time monitoring of oil levels within the tank. This ensures optimal transformer performance and protection by preventing issues related to insufficient oil. The indicator is designed for easy visibility, robust durability, and compliance with industry standards, offering enhanced reliability and user convenience.
Easy-to-Read Indicators: Clear visual indication for quick assessments.
Corrosion-Resistant Design: Suitable for outdoor installations in harsh conditions.
Pressure Relief Valve
The brass pressure relief valve on the CSP single-phase pole-mounted transformer provides stable sealing, corrosion resistance, and repeatable opening characteristics. Precisely calibrated spring settings vent internal overpressure while minimizing oil loss. The compact assembly supports safe, controlled fault clearing, protects the tank against rupture, and simplifies maintenance, helping preserve dielectric strength, transformer reliability, in demanding installations over long service life.
Fast pressure relief minimizes mechanical stress on transformer tank.
Reliable resealing design reduces oil loss and maintenance interventions.
LV circuit breaker with reset
The CSP single-phase pole-mounted transformer can include an LV circuit breaker with manual reset and an integral overload indicator light. The breaker provides short-circuit and overload protection on the low-voltage side, while the light offers clear visual confirmation of trip events. This configuration simplifies fault localization, speeds service restoration, and helps protect windings and downstream loads during continued service.
Integrated LV breaker provides secondary short-circuit and overload protection.
Manual reset avoids fuse replacement, speeding restoration after transient faults.
HV Surge Arrester
The CSP single-phase pole-mounted transformer can be equipped with an HV metal-oxide surge arrester connected between the HV bushing and ground. During lightning or switching surges, the arrester conducts, limiting transient overvoltage across the winding insulation and diverting energy safely to earth.This reduces insulation stress, prevents dielectric failure, and improves service continuity in exposed overhead networks.
MOV-based arrester clamps lightning surges, protecting transformer insulation.
Creepage distance configurable for coastal, industrial environments.
LV Surge Arrester
The LV surge arrester on the CSP single-phase pole-mounted transformer is a MOV-based SPD connected in parallel with the low-voltage winding to clamp transient overvoltages and divert surge current safely to ground. This protection effectively limits voltage stress on secondary insulation and downstream loads, reducing nuisance trips, equipment damage, and service interruptions while improving overall distribution reliability and asset life.
Customizable voltage rating and MCOV values match distribution systems.
Compact form factor suited to CSP cabinets with limited space.
Elsp Fuse
The ELSP backup fuse in a CSP single-phase pole-mounted transformer is a current-limiting, internally mounted fuse coordinated with the external bayonet device. It interrupts high-fault currents rapidly, limiting thermal and mechanical stress on the windings and tank. Time-current characteristics are engineered to match transformer kVA, improving protection selectivity, service continuity, and asset life in overhead distribution networks.
Backup current-limiting design sharply reduces let-through energy during faults.
Available voltage and ampere ratings tailored to specific transformer applications.
Earthing device
The earthing device on the CSP single-phase pole-mounted transformer bonds the LV neutral directly to the tank using a copper strip, with a dedicated tank ground pad for external earth connection. This low-impedance path safely conducts fault currents, stabilizes system voltage, improves lightning performance, and supports personnel safety and insulation integrity under network fault and switching conditions during everyday operation.
Copper strap bonds LV neutral to tank for solid grounding.
Dedicated tank earth pads provide low-impedance connection to grid
Nameplate
The nameplate on the CSP single-phase pole-mounted transformer provides standardized identification of ratings, vector group, impedance, cooling, and tap positions in accordance with ANSI/IEEE requirements. Durable etched stainless-steel construction preserves legibility in outdoor service. Clear, permanent data supports correct selection, installation, protection settings, and future maintenance, reducing misoperation risk and simplifying asset management for utilities over its lifetime.
Compliant with ANSI and IEEE marking and identification requirements.
Displays kVA, voltage, impedance, vector group, cooling class clearly.
About Oil-Filled
Designed for self-protected overhead distribution, our CSP Single Phase Pole Mounted Transformer can use FR3D natural ester insulating oil to improve fire safety, moisture resistance, and insulation life, while integrated fuse, arrester, and breaker options support reliable field operation.
Mineral Oil
Low Transformer Cost
Good Heat Dissipation
Good Dielectric Performance
Good Cold Climate Performance
Low Maintenance Cost
Preventative maintenance
Vaults required for indoor installations per NEC® due to low fire point
Potentialhigher installation cost
<30% biodegradability
Silicone Fluid
Low heat release
Reduced smoke
Low flame
Self extinguishing
Good dielectric performance
Low toxicity
Moderate viscosity
High stability
Non-biodegradable
Not suitable for use with internal Bay-O-Net fuses
Transformer cost
Disposal cost
Viton gaskets required
Retrofil applications
High transformer cost
High moisture absorption
Envirotemp FR3
High fire point—360 °C
High flash point—330 °C
Compatible with mineral oil
Excellent dielectric performance
Greater than 99% biodegradable
Greater tolerance to moisture, dramatically extending insulation life .
Transformer cost (lower than silicone fluid)
Pour point (–15 °C to –25 °C) transformer energized with full load with top oil temperature at –50 °C with no problems—no crystals formed at –68°C
Allows transformers to be designed to operate at 10°C higher average winding rise (75°C) without reducing normal transformer insulation life
Excellent switching medium
Excellent cold weather performance
About Testing
Comprehensive type and routine tests confirm insulation strength and zero-sequence behavior, ensuring reliable neutral grounding performance and compliance with IEC and IEEE.
Routine Tests
Type Tests
Special Tests
Winding Resistance
Load Loss + Impedance (short-circuit Impedance)
Ratio + Polarity / Phase-relation
Dielectric: Applied AC Withstand (separate-source)
.no-load Loss + Excitation Current
Dielectric: induced AC withstand
Temperature rise
Lightning impulse withstand (BIL)
Short-circuit withstand (when specified)
Sound level (when specified)
Special tests (by agreement)
Partial discharge (PD) (when specified)
Capacitance + dissipation factor (tan δ / PF)
Zero-sequence impedance (when specified)
Induced-voltage with PD measurement (IVPD)
Functional verification of CSP protective features
Transformers are tested in strict accordance with the latest revision of applicable ansl, IEEE, nema, and rus with test reports available transformer serial number.
Package & Delivery
Engineered packaging and controlled logistics protect transformers from damage, simplifying site handling, offloading, installation and commissioning project schedules.
Wooden / Steel Skid with Sealing Film
For nearby deliveries, we recommend skid plus sealing film when you need economical protection, forklift handling and quick onsite positioning.
Wooden / Steel Frame
We suggest wooden or steel framing when you require protection for protruding parts, highway transport, repeated loading and open-deck shipping.
Wooden Crate
Preferred for export and long routes; closed crates protect from weather, dirt and impact, allow stacking and minimise accessory loss.
Container Shipment
Ideal for high-value or overseas projects; containers improve weather protection, security and standardised lashing, simplifying sea–rail–road multimodal logistics.
Transportation & Delivery
We propose skid, frame, crate or container options based on route, handling and budget, ensuring safe, efficient transformer delivery.
CSP Single Phase Pole Mounted Transformer FAQ
Review key FAQ before purchasing a CSP Single Phase Pole Mounted Transformer, covering lead time, grid standard customization,certified components, factory testing, installation support, and long-term reliable operation.
What Is The Lead Time For A CSP Single Phase Pole Mounted Transformer?
The typical lead time for a CSP single phase pole mounted transformer is 3 to 8 weeks, depending on capacity, voltage rating, protection accessory delivery,tank design, testing scope, inspection schedule, drawing approval, and order quantity.
Can The Transformer Be Customized For Different Grid Standards?
The transformer can be customized according to IEEE/ANSI, IEC, CSA, or local utility standards. Project-required certificates, test reports, UL-related documents, and third-party inspection reports can be provided where applicable.
What Customization Options Are Available For A CSP Single Phase Pole Mounted Transformer?
Customization options include primary voltage, secondary voltage, capacity, winding material, insulation oil, surge arrester, internal fuse, circuit breaker,secondary breaker, overload protection, bushing type, tank design, nameplate language, and anti-corrosion coating.
What Tests Are Performed Before Delivery?
Routine tests include winding resistance, voltage ratio, polarity, impedance, load loss, no-load loss, insulation resistance, applied voltage, induced voltage, leakage test, protection device inspection, and oil tests. Type and special tests can be arranged as required, and third-party witnessed FAT.
Do You Support Installation And Commissioning?
Installation and commissioning support can be provided by documents, remote guidance, video support, or on-site engineers. Support includes mounting guidance, wiring checks, grounding verification, protection accessory checking, pre-energization inspection, and commissioning coordination.
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Kerun Intelec
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