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CGIS3818 Current Transformer Applied to CGIS Gas Insulated Switchgear

12kVCGIS3818

Winding & Schematic TopologyInternal Wiring Diagram

Primary Winding (P1 - P2):Series-connected in the line / through-core — 12kV

Secondary Metering (1S1 - 1S2):5A or 1A (0.2FS10/0.5SFS10,0.5SFS10,5P10/10P10,5P20/10P20,5P30/10P30)

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:CGIS3818

CGIS3818 Current Transformer Applied to CGIS Gas Insulated Switchgear

Indoor epoxy resin casting current transformer designed for CGIS gas insulated switchgear, with multiple accuracy class, rated burden and primary current options.

Key Engineering Advantages

Indoor epoxy resin casting current transformer for CGIS
extra large diameter split ring type
outer diameter Ø376mm max
inner diameter Ø180mm

Engineering Data

Complete Electrical & Mechanical Specifications

Model Ref: CGIS3818

Electrical Parameters

Primary Rated Voltage (Un):12kV

Secondary Winding Voltages:5A or 1A

Metering & Protection Class:0.2FS10/0.5SFS10,0.5SFS10,5P10/10P10,5P20/10P20,5P30/10P30

Rated Output Burden:

Rated Frequency:50/60Hz

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 epoxy resin CT for CGIS, 12kV, 50/60Hz, multiple accuracy classes. Suitable for protection and metering in gas-insulated switchgear.

Comprehensive Spec Matrix

Parameter	Specification	Verification
Product Type	Current Transformer	[On Request]
Model Code	CGIS3818	Factory nameplate marking
Primary Voltage	12kV	Rated voltage test (IEC 61869-1/3)
Secondary Voltage	5A or 1A	Ratio check at rated frequency
Accuracy Class	0.2FS10/0.5SFS10,0.5SFS10,5P10/10P10,5P20/10P20,5P30/10P30	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)	[On Request]	Power-frequency & lightning impulse withstand
Standards	[On Request]	Certified to listed standards
Frequency	50/60Hz	Per IEC 61869-1
Environment	[On Request]	Per datasheet limits

Fit & Unfit Boundaries

Ideal For

CGIS gas insulated switchgear indoor applications
12kV primary systems with secondary 5A or 1A
Metering and protection with accuracy classes 0.2FS10, 0.5SFS10, 5P10, 10P10, 5P20, 10P20, 5P30, 10P30
Large conductor applications with inner diameter 180mm

Not Recommended For

Outdoor installations
Voltage transformation applications
Systems above 12kV
Non-gas-insulated switchgear retrofits without verification

Topology & Wiring

Connect primary through the window. 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 and IEEE C57.13 conventions.

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 maximum outer diameter?

A: Ø376mm max.

Q: What are the available accuracy classes?

A: 0.2FS10/0.5SFS10, 0.5SFS10, 5P10/10P10, 5P20/10P20, 5P30/10P30.

Q: Is it suitable for outdoor use?

A: No, it is designed for indoor CGIS applications.

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

CGIS3818
14 cols · 29 rows

CGIS3818 Current Transformer for Gas-Insulated Switchgear — Technical Data

Accuracy class	Rated output (VA)	75(h)	75(h)	100(h)	125(h)	150(h)	200(h)	250(h)	300(h)	400(h)	500(h)	600(h)	750(h)
0.2FS10	2.5	—	—	51	51	41	36	31	31	31	31	31	31
0.2FS10	5	—	—	46	51	51	51	48	36	36	31	31	31
0.2FS10	7.5	—	—	—	51	51	51	51	51	41	36	36	31
0.2FS10	10	—	—	—	51	51	51	51	51	51	41	46	41
0.2FS10	15	—	—	—	—	51	51	51	51	51	48	41	41
0.2FS10	20	—	—	—	—	51	51	51	51	51	51	51	51
0.5FS10	2.5	—	—	51	41	31	31	31	31	31	31	31	31
0.5FS10	5	—	—	46	51	51	51	48	36	36	31	31	31
0.5FS10	7.5	—	—	—	51	51	51	51	51	41	41	41	36
0.5FS10	10	—	—	—	51	51	51	51	51	51	51	41	41
0.5FS10	15	—	—	—	—	51	51	51	51	51	51	51	51
0.5FS10	20	—	—	—	—	51	51	51	51	51	51	51	51
5P10/10P10	2.5	85	50	60	40	30	25	20	20	20	20	20	20
5P10/10P10	5	—	155	160	110	66	46	35	26	25	20	20	20
5P10/10P10	7.5	—	140	155	85	55	40	30	30	25	25	25	25
5P10/10P10	10	—	170	185	110	70	50	40	35	30	30	30	30
5P10/10P10	15	—	—	180	160	100	70	50	45	40	35	35	35
5P10/10P10	20	—	—	—	160	130	90	65	55	45	40	40	40
5P10/10P10	25	—	—	—	155	160	110	75	60	55	50	50	50
5P10/10P10	30	—	—	—	185	190	130	85	70	65	65	65	65
5P20/10P20	2.5	130	70	55	50	40	35	30	30	30	30	30	30
5P20/10P20	5	—	150	160	110	65	55	45	40	35	30	30	30
5P20/10P20	7.5	—	—	130	155	90	75	65	50	45	40	35	35
5P20/10P20	10	—	—	170	185	115	80	65	55	50	45	40	40
5P20/10P20	15	—	—	—	170	165	130	110	85	75	65	60	60
5P30/10P30	1.5	85	65	55	45	40	35	30	30	25	25	25	25
5P30/10P30	2.5	130	95	80	65	55	45	40	35	30	30	30	30
5P30/10P30	5	—	145	150	120	90	75	65	55	45	45	45	45
5P30/10P30	7.5	—	—	155	170	130	105	90	75	65	60	55	55

Engineering Drawing

Specification & Outline Drawing

Original image, not compressed

Dimension & outline drawing of CGIS3818 — click image to zoom / view original.