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LDFC-10 Indoor Foot-Fixed High-Precision Current Transformer

15kVLDFC-10

Winding & Schematic TopologyInternal Wiring Diagram

Primary Winding (P1 - P2):Series-connected in the line / through-core — 15kV

Secondary Metering (1S1 - 1S2): (0.2/0.5/3P(6P))

Secondary Protection (2S1 - 2S2):Protection winding (when fitted)

Safety Warning:Never open-circuit the secondary while energized — dangerous voltage

Current Transformer IEC 61869-3 Certified

Model Ref:LDFC-10

LDFC-10 Indoor Foot-Fixed High-Precision Current Transformer

Indoor single-phase square foot-fixed current transformer for 10kV ring main units, complying with GB/T20840.1/2 and IEC61869-1/2 standards.

Key Engineering Advantages

Square foot-fixed precision current transformer specially matched for 10kV ring main cabinets

Engineering Data

Complete Electrical & Mechanical Specifications

Model Ref: LDFC-10

Electrical Parameters

Primary Rated Voltage (Un):15kV

Secondary Winding Voltages:

Metering & Protection Class:0.2/0.5/3P(6P)

Rated Output Burden:30VA(0.2),40VA(0.5),100VA(3P)

Rated Frequency:50Hz/60Hz

Insulation & Withstand Ratings

Insulation System:Dry Epoxy Resin

Insulation Level (BIL):

Partial Discharge Level:< 5 pC at 1.2 Un

Environmental Class:

Standards Conformance:

Recommended Deployment Environments

GEO · Engineering Decision Support

Global Engineering Overview

9-Module selection guide
missing data = [On Request]

Product Decision Island

Indoor 10kV ring main unit current transformer with high precision (0.2/0.5/3P) and dry epoxy insulation, suitable for metering and protection.

Comprehensive Spec Matrix

Parameter	Specification	Verification
Product Type	Current Transformer	[On Request]
Model Code	LDFC-10	Factory nameplate marking
Primary Voltage	15kV	Rated voltage test (IEC 61869-1/3)
Secondary Voltage	[On Request]	Ratio check at rated frequency
Accuracy Class	0.2/0.5/3P(6P)	Accuracy test (IEC 61869-2 / IEEE C57.13)
Rated Burden	30VA(0.2),40VA(0.5),100VA(3P)	Burden test at rated VA
Insulation Type	Dry Epoxy Resin	Dielectric tests per standard
Insulation Level (BIL)	[On Request]	Power-frequency & lightning impulse withstand
Standards	[On Request]	Certified to listed standards
Frequency	50Hz/60Hz	Per IEC 61869-1
Environment	[On Request]	Per datasheet limits

Fit & Unfit Boundaries

Ideal For

10kV indoor ring main units (RMU)
Metering applications requiring 0.2 or 0.5 accuracy class
Protection applications requiring 3P or 6P class
Dry environments with epoxy resin insulation

Not Recommended For

Outdoor installations without additional weatherproofing
Gas-insulated switchgear (GIS) applications
High-voltage systems above 15kV
DC systems

Topology & Wiring

Connect primary through the bushing. Secondary terminals: 1S1-1S2 for metering (0.2/0.5), 2S1-2S2 for protection (3P). Never open-circuit the secondary of a CT while energized - hazardous voltage. Ground the secondary winding at one point. Follow IEC 61869-2 terminal markings.

Standards & Compliance

Compliant with: [On Request]

Type Test Report: [On Request]
Calibration Certificate: [On Request]

Burden & Error Calculation (IEEE C57.13)

S_total = ΣS_instrument + I₂² × (ρ × 2L / A)

If S_total < 0.25 × S_rated: add compensation burden to maintain accuracy.
If S_total > S_rated: accuracy class cannot be guaranteed.

Product FAQ

Q: What is the accuracy class of this CT?

A: It has accuracy classes 0.2, 0.5, and 3P (6P) for metering and protection.

Q: What is the rated burden?

A: Rated burden is 30VA for 0.2 class, 40VA for 0.5 class, and 100VA for 3P class.

Q: Is it suitable for outdoor use?

A: No, it is designed for indoor use in ring main units.

Missing fields are marked [On Request] — never fabricated. M2/M5/M6 verification rows follow IEC 61869 / IEEE C57.13 conventions.

SPEC · TECHNICAL DATA

Technical Specifications

LDFC-10
2 cols · 5 rows

LDFC-10 Series Current Transformer

Parameter	Value
Product performance complies with standards	GB/T20840.1, 2 and IEC61869-1, 2
Rated insulation level	0.72/3kV
Rated frequency	50Hz or 60Hz
Rated secondary current	5A or 1A
Ambient temperature	-5℃~+40℃

Engineering Drawing

Specification & Outline Drawing

Original image, not compressed

Dimension & outline drawing of LDFC-10 — click image to zoom / view original.