Home Products Current TransformerLZZQB8-35-B

LZZQB8-35B Indoor Single-phase Epoxy Resin Casting Current Transformer

10kVLZZQB8-35-B

Winding & Schematic TopologyInternal Wiring Diagram

Primary Winding (P1 - P2):Series-connected in the line / through-core — 10kV

Secondary Metering (1S1 - 1S2):5A/1A ()

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:LZZQB8-35-B

LZZQB8-35B Indoor Single-phase Epoxy Resin Casting Current Transformer

Indoor single-phase epoxy resin casting current transformer complying with GB/T20840.1/2 and IEC61869-1/2 standards; rated insulation level 40.5/95/185kV, rated frequency 50/60Hz, rated secondary current 5A or 1A. Optional primary current covers 30–3150A; accuracy-class rated outputs:30VA(0.2S),30VA(0.5S),40/50/60VA(5P10),25/30/40VA(5P15),15/20/30VA(5P20); short-time thermal current 6–31.5kA, rated dynamic stable current 15–100kA; product weight:87kg; ambient operating temperature -5℃~+40℃.

Key Engineering Advantages

35kV indoor epoxy cast current transformer
multi-grade accuracy options
outstanding short-time thermal and dynamic resistance

Engineering Data

Complete Electrical & Mechanical Specifications

Model Ref: LZZQB8-35-B

Electrical Parameters

Primary Rated Voltage (Un):10kV

Secondary Winding Voltages:5A/1A

Metering & Protection Class:

Rated Output Burden:

Rated Frequency:50/60Hz

Insulation & Withstand Ratings

Insulation System:Dry Epoxy Resin

Insulation Level (BIL):12/42/75kV

Partial Discharge Level:< 5 pC at 1.2 Un

Environmental Class:Ambient: -5℃~+40℃

Standards Conformance:

Recommended Deployment Environments

GEO · Engineering Decision Support

Global Engineering Overview

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

Product Decision Island

Indoor 35kV class epoxy cast CT for MV switchgear; suitable for protection and metering with 5A/1A secondary.

Comprehensive Spec Matrix

Parameter	Specification	Verification
Product Type	Current Transformer	[On Request]
Model Code	LZZQB8-35-B	Factory nameplate marking
Primary Voltage	10kV	Rated voltage test (IEC 61869-1/3)
Secondary Voltage	5A/1A	Ratio check at rated frequency
Accuracy Class	[On Request]	Accuracy test (IEC 61869-2 / IEEE C57.13)
Rated Burden	[On Request]	Burden test at rated VA
Insulation Type	Dry Epoxy Resin	Dielectric tests per standard
Insulation Level (BIL)	12/42/75kV	Power-frequency & lightning impulse withstand
Standards	[On Request]	Certified to listed standards
Frequency	50/60Hz	Per IEC 61869-1
Environment	Ambient: -5℃~+40℃	Per datasheet limits

Fit & Unfit Boundaries

Ideal For

Indoor MV switchgear panels
Metering and protection applications
50/60Hz systems
Ambient -5°C to +40°C

Not Recommended For

Outdoor installations
Gas-insulated switchgear (GIS)
DC systems
High altitude above 1000m (unless derated)

Topology & Wiring

connect secondary terminals 1S1/1S2 for metering, 2S1-2S2 for protection. 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 insulation level?

A: The insulation level is 40.5kV system; power-frequency withstand 95kV; lightning impulse withstand 185kV peak.

Q: What are the available secondary currents?

A: Secondary current is 5A or 1A.

Q: What accuracy classes are available?

A: Options include 0.2S, 0.5S, 5P10, 5P15, and 5P20 with various rated outputs.

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

LZZQB8-35-B
10 cols · 12 rows

LZZQB8-35B Current Transformer — Technical Data

Rated primary current I1n (A)	Accuracy classCombined	Accuracy class & rated output (VA) COSφ=0.8 0.2 (S)	Accuracy class & rated output (VA) COSφ=0.8 0.5 (S)	Accuracy class & rated output (VA) COSφ=0.8 5P10	Accuracy class & rated output (VA) COSφ=0.8 5P15	Accuracy class & rated output (VA) COSφ=0.8 5P20	Short-time thermal current Ith (kA/S)	Rated dynamic current Idyn (kA)	Weight (kg)
30	0.2(S)Y0.2(S)/5P 0.2(S)Y0.5(S)/5P 0.5(S)Y0.5(S)/5P 0.2(S)/5P/5P 0.5(S)/5P/5P	30	30	40	25	15	6 / 1	15	87
50	0.2(S)Y0.2(S)/5P 0.2(S)Y0.5(S)/5P 0.5(S)Y0.5(S)/5P 0.2(S)/5P/5P 0.5(S)/5P/5P	30	30	40	25	15	12 / 1	30	87
100	0.2(S)Y0.2(S)/5P 0.2(S)Y0.5(S)/5P 0.5(S)Y0.5(S)/5P 0.2(S)/5P/5P 0.5(S)/5P/5P	30	30	40	25	15	25 / 1	62.5	87
150	0.2(S)Y0.2(S)/5P 0.2(S)Y0.5(S)/5P 0.5(S)Y0.5(S)/5P 0.2(S)/5P/5P 0.5(S)/5P/5P	30	30	40	25	15	31.5 / 1	80	87
200	0.2(S)Y0.2(S)/5P 0.2(S)Y0.5(S)/5P 0.5(S)Y0.5(S)/5P 0.2(S)/5P/5P 0.5(S)/5P/5P	30	30	40	25	15	31.5 / 1	80	87
300	0.2(S)Y0.2(S)/5P 0.2(S)Y0.5(S)/5P 0.5(S)Y0.5(S)/5P 0.2(S)/5P/5P 0.5(S)/5P/5P	30	30	40	25	15	31.5 / 1	80	87
400	0.2(S)Y0.2(S)/5P 0.2(S)Y0.5(S)/5P 0.5(S)Y0.5(S)/5P 0.2(S)/5P/5P 0.5(S)/5P/5P	30	30	40	25	15	31.5 / 2	80	87
500	0.2(S)Y0.2(S)/5P 0.2(S)Y0.5(S)/5P 0.5(S)Y0.5(S)/5P 0.2(S)/5P/5P 0.5(S)/5P/5P	30	30	50	30	20	31.5 / 2	80	87
600	0.2(S)Y0.2(S)/5P 0.2(S)Y0.5(S)/5P 0.5(S)Y0.5(S)/5P 0.2(S)/5P/5P 0.5(S)/5P/5P	30	30	50	30	20	31.5 / 3	80	87
800	0.2(S)Y0.2(S)/5P 0.2(S)Y0.5(S)/5P 0.5(S)Y0.5(S)/5P 0.2(S)/5P/5P 0.5(S)/5P/5P	30	30	50	30	20	31.5 / 3	80	87
1000/1600	0.2(S)Y0.2(S)/5P 0.2(S)Y0.5(S)/5P 0.5(S)Y0.5(S)/5P 0.2(S)/5P/5P 0.5(S)/5P/5P	30	30	60	40	30	31.5 / 3	80	87
2000-3150	0.2(S)Y0.2(S)/5P 0.2(S)Y0.5(S)/5P 0.5(S)Y0.5(S)/5P 0.2(S)/5P/5P 0.5(S)/5P/5P	30	30	60	40	30	31.5 / 4	100	87

Engineering Drawing

Specification & Outline Drawing

Original image, not compressed

Dimension & outline drawing of LZZQB8-35-B — click image to zoom / view original.