Home Products Current TransformerCGIS1780-I

CGIS1780 I Current Transformer Applied to CGIS Gas Insulated Switchgear

35kVCGIS1780-I

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:CGIS1780-I

CGIS1780 I 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
outer diameter Φ168mm
inner diameter Φ80mm

Engineering Data

Complete Electrical & Mechanical Specifications

Model Ref: CGIS1780-I

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 CT for CGIS at 35kV; suitable for protection and metering in gas-insulated switchgear.

Comprehensive Spec Matrix

Parameter	Specification	Verification
Product Type	Current Transformer	[On Request]
Model Code	CGIS1780-I	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) applications
Indoor installation with dry epoxy resin insulation
Protection and metering circuits requiring multiple accuracy classes
50/60Hz power systems

Not Recommended For

Outdoor installations without additional enclosure
Voltage transformation (not a PT)
Systems above 35kV
Oil or SF6 insulated equipment (not compatible)

Topology & Wiring

connect secondary terminals 1S1/1S2 for main metering/protection; if dual secondary, use 2S1-2S2 for protection. Never open-circuit the secondary of a CT while energized - hazardous voltage. Ground the secondary winding at one point.

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 of this CT?

A: The primary voltage is 35kV, but insulation level shorthand is not provided; please refer to detailed specs or contact us.

Q: Can this CT be used outdoors?

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

Q: What are the available accuracy classes?

A: Multiple accuracy classes are available; specific values are not listed in the provided data.

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

CGIS1780-I
34 cols · 34 rows

CGIS1780 I Current Transformer for Gas-Insulated Switchgear — Technical Data

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

Engineering Drawing

Specification & Outline Drawing

Original image, not compressed

Dimension & outline drawing of CGIS1780-I — click image to zoom / view original.