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CGIS1911 Current Transformer Applied to CGIS Gas Insulated Switchgear

35kVCGIS1911

Winding & Schematic TopologyInternal Wiring Diagram

Primary Winding (P1 - P2):Series-connected in the line / through-core — 35kV

Secondary Metering (1S1 - 1S2): ()

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:CGIS1911

CGIS1911 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
square housing with Ø106mm inner window

Engineering Data

Complete Electrical & Mechanical Specifications

Model Ref: CGIS1911

Electrical Parameters

Primary Rated Voltage (Un):35kV

Secondary Winding Voltages:

Metering & Protection Class:

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 35kV CGIS switchgear; multiple accuracy and burden options.

Comprehensive Spec Matrix

Parameter	Specification	Verification
Product Type	Current Transformer	[On Request]
Model Code	CGIS1911	Factory nameplate marking
Primary Voltage	35kV	Rated voltage test (IEC 61869-1/3)
Secondary Voltage	[On Request]	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)	[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

35kV gas-insulated switchgear (CGIS) indoor installations
Current measurement and protection in medium-voltage distribution
Integration into switchgear panels with Ø106mm window bushing
Applications requiring dry-type insulation (epoxy resin)

Not Recommended For

Outdoor installations without additional enclosure
Voltage transformation or potential indication
High-voltage transmission networks above 35kV
Applications requiring oil or SF6 insulation

Topology & Wiring

For current transformers, adhere to IEC 61869-2 terminal markings: primary P1/P2, secondary 1S1/1S2 (protection winding 2S1-2S2 if applicable). Never open-circuit the secondary of a CT while energized - hazardous voltage may occur. Ground the secondary circuit at one point only. Ensure correct polarity for differential or directional protection. Verify rated burden and accuracy class before energizing.

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 primary voltage rating of this CT?

A: The primary voltage is 35kV.

Q: Can this CT be used outdoors?

A: No, it is designed for indoor use within CGIS switchgear.

Q: What is the inner window diameter?

A: The inner window diameter is Ø106mm.

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

CGIS1911
17 cols · 35 rows

CGIS1911 Current Transformer for Gas-Insulated Switchgear — Technical Data

Accuracy class	Rated output (VA)	Rated primary current (A)
Accuracy class	Rated output (VA)	(50)	(60)	(75)	(100)	(125)	(150)	(200)	(250)	(300)	(400)	(500)	(600)	(750)	(1000)	(1200)
0.2FS10 / 0.5FS10	2.5	—	—	—	130	100	85	45	35	30	30	30	30	35	35	—
	5	—	—	—	165	100	65	50	40	30	30	30	30	35	35	—
	10	—	—	—	—	—	165	100	70	50	35	30	30	35	35	—
	15	—	—	—	—	—	140	95	65	45	40	35	35	35	35	—
	20	—	—	—	—	—	175	120	80	50	45	40	40	40	35	—
	25	—	—	—	—	—	145	95	60	50	45	45	45	40	40	—
	30	—	—	—	—	—	—	170	110	65	55	50	50	45	45	—
0.5FS10	2.5	—	165	115	75	55	45	35	30	30	25	20	20	20	25	—
	5	—	—	115	80	65	40	35	30	30	25	20	20	20	25	—
	10	—	—	—	130	100	60	50	40	35	30	25	20	20	25	—
	15	—	—	—	135	80	60	50	45	35	30	25	20	25	—	—
	20	—	—	—	—	95	75	65	50	40	30	25	20	25	—	—
	25	—	—	—	—	115	90	75	55	60	35	30	25	25	—	—
	30	—	—	—	—	135	105	85	65	55	35	30	25	25	—	—
5P10 / 10P10	2.5	150	110	75	70	55	45	35	30	30	25	25	25	20	25	—
	5	—	175	135	105	85	70	55	45	40	35	35	30	25	30	—
	10	—	—	185	145	115	85	70	60	55	45	40	35	30	35	—
	15	—	—	—	160	115	95	80	70	60	55	45	40	45	—	—
	20	—	—	—	150	120	100	90	75	65	55	45	40	45	—	—
	25	—	—	—	185	145	120	105	90	75	65	55	55	55	—	—
	30	—	—	—	—	170	140	125	105	90	75	80	65	60	—	—
5P20 / 10P20	2.5	—	180	145	115	90	75	60	50	45	40	35	35	30	35	—
	5	—	—	185	145	120	90	75	65	60	50	45	40	40	45	—
	10	—	—	—	200	150	120	105	95	80	70	60	50	45	—	—
	15	—	—	—	—	165	145	130	105	95	80	85	70	60	—	—
	20	—	—	—	—	185	160	135	115	100	80	85	80	—	—	—
	25	—	—	—	—	—	195	160	140	120	95	100	—	—	—	—
	30	—	—	—	—	—	190	165	140	110	115	—	—	—	—	—
5P30 / 10P30	2.5	—	—	200	160	130	105	85	70	60	55	50	45	40	45	—
	5	—	—	—	170	135	110	95	85	70	65	60	55	60	80	—
	10	—	—	—	—	—	190	160	135	115	105	90	80	80	—	—
	15	—	—	—	—	—	—	190	160	140	120	100	105	—	—	—
	20	—	—	—	—	—	—	—	175	155	125	125	—	—	—	—
	25	—	—	—	—	—	—	—	—	190	150	150	—	—	—	—
	30	—	—	—	—	—	—	—	—	—	175	175	—	—	—	—

Engineering Drawing

Specification & Outline Drawing

Original image, not compressed

Dimension & outline drawing of CGIS1911 — click image to zoom / view original.