Core Clamping System for Medium Voltage Current Transformers

Product Specifications

Technical details and manufacturing context for Core Clamping System

Definition

The Core Clamping System is a critical component of the Medium Voltage Current Transformer Core Assembly, designed to apply precise and uniform pressure to the laminated magnetic core stack. It ensures the core remains stable, prevents vibration-induced noise, maintains proper magnetic circuit integrity, and protects against mechanical stress during operation and transportation. The system typically uses a combination of clamping plates, bolts, springs, and insulating components to apply controlled compressive force to the core laminations. This force minimizes air gaps between laminations, reduces magnetic losses (eddy currents and hysteresis), and ensures the core maintains its structural and electrical integrity under varying thermal and electromagnetic conditions. The system is available in configurations suitable for core diameters from 50 to 300 mm and core heights from 30 to 200 mm, with a clamping force range of 5 to 20 kN. Clamping pressure is specified between 1.0 and 1.6 MPa. Surface flatness of clamping plates is maintained within 0.05 mm per ISO 1101 to ensure uniform pressure distribution. Insulation resistance between clamping parts and the core is at least 1000 MΩ at 500 V DC, and dielectric strength is at least 5 kV, both per IEC 60243. The system operates within a temperature range of -40°C to 85°C (IEC 60068-2-1) and withstands relative humidity up to 95% non-condensing at 40°C (IEC 60068-2-78). Ingress protection ratings range from IP54 to IP65 per IEC 60529. Structural parts are made of Q235B carbon steel (GB/T 700) with hot-dip galvanized surface treatment (Zn-8–12 μm) per ISO 1461. Weight varies from 2 to 15 kg depending on core size and configuration. All listed values are reference ranges; verify model-specific parameters and standards with the legal manufacturer or supplier before procurement.

Working Principle

The system applies controlled compressive force to the laminated core stack using clamping plates, bolts, springs, and insulating components. This force minimizes air gaps between laminations, reducing magnetic losses such as eddy currents and hysteresis. It also maintains structural integrity under thermal expansion and electromagnetic forces, preventing vibration-induced noise and ensuring stable magnetic circuit performance. The clamping pressure is set within a range that avoids damaging the core.

Common Materials

Cold-rolled steel, Stainless steel, Insulating epoxy laminate

Technical Parameters

Parameter	Typical range	Notes & selection driver
Clamping Force	5–20 kN	Ensures core stability under short-circuit conditions
Core Diameter Range	50–300 mm	Accommodates standard medium voltage transformer cores
Core Height Range	30–200 mm	Fits typical core stack heights
Surface Flatness	≤0.05 mm	Ensures uniform pressure distributionISO 1101
Insulation Resistance	≥1000 MΩ	At 500 V DC, between clamping parts and coreIEC 60243
Dielectric Strength	≥5 kV	Withstands test voltage without breakdownIEC 60243
Operating Temperature	-40–85 °C	Continuous operation within this rangeIEC 60068-2-1
Relative Humidity	≤95 %	Non-condensing at 40°CIEC 60068-2-78
Ingress Protection	IP54–IP65	Protection against dust and water jetsIEC 60529
Material Grade	Q235B	Carbon steel for structural partsGB/T 700
Surface Treatment	Zn-8–12 μm	Hot-dip galvanized for corrosion resistanceISO 1461
Weight	2–15 kg	Depends on core size and configuration

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Clamping Plate Part
Distributes clamping force evenly across core surface

Material: Cold-rolled steel
Insulating Spacer Part
Provides electrical isolation between core and clamping structure

Material: Epoxy laminate
Tensioning Bolt Part
Applies and maintains precise clamping pressure

Material: Stainless steel
Clamping Springs
Keep the clamping force constant as the core stack settles and expands with temperature.

Manufacturers of Core Clamping System

Manufacturer profiles associated with Core Clamping System.

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Frequently Asked Questions

What is the function of the Core Clamping System?

It securely clamps the laminated magnetic core in a medium voltage current transformer, applying uniform pressure to minimize air gaps, reduce magnetic losses, and prevent vibration-induced noise, ensuring stable operation.

What are the typical clamping force and pressure ranges?

The clamping force is typically 5–20 kN, and the clamping pressure is 1.0–1.6 MPa. These are reference ranges; confirm exact values for your model.

What standards apply to the insulation properties?

Insulation resistance is ≥1000 MΩ at 500 V DC, and dielectric strength is ≥5 kV, both per IEC 60243. These ensure electrical safety between clamping parts and the core.

How does the system handle environmental conditions?

It operates from -40°C to 85°C (IEC 60068-2-1) and up to 95% relative humidity non-condensing at 40°C (IEC 60068-2-78). Ingress protection is IP54–IP65 per IEC 60529, protecting against dust and water jets.

Data Basis

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Preliminary Technical Classification

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pressure:	Max clamping force: 5000 N, Max compressive stress: 50 MPa
other spec:	Core diameter range: 50-300 mm, Vibration resistance: 5g @ 10-2000 Hz, Insulation class: F (155°C)
temperature:	-40°C to +85°C

Core Clamping System

Product Specifications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards