Home Products Current TransformerCGIS1775

CGIS1775 Current Transformer Applied to CGIS Gas Insulated Switchgear

35kVCGIS1775

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:CGIS1775

CGIS1775 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 Φ75mm inner window

Engineering Data

Complete Electrical & Mechanical Specifications

Model Ref: CGIS1775

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 CGIS at 35kV, 50/60Hz. Suitable for protection and metering in gas-insulated switchgear.

Comprehensive Spec Matrix

Parameter	Specification	Verification
Product Type	Current Transformer	[On Request]
Model Code	CGIS1775	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

CGIS gas insulated switchgear indoor installations
35kV power systems
Metering and protection applications
50/60Hz networks

Not Recommended For

Outdoor installations
Voltage transformation
Non-gas-insulated switchgear
Systems above 35kV

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.

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?

A: 35kV

Q: What is the insulation type?

A: Dry epoxy resin

Q: What is the inner window diameter?

A: Φ75mm

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

CGIS1775
18 cols · 34 rows

CGIS1775 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
0.2FS10 / 0.5FS10	2.5	—	—	—	—	—	65	55	40	35	30	30	30	30	35	35	35
0.2FS10 / 0.5FS10	5	—	—	—	—	—	96	80	55	50	35	30	30	30	35	35	35
0.2FS10 / 0.5FS10	10	—	—	—	—	—	120	80	60	45	35	35	30	35	35	35	35
0.2FS10 / 0.5FS10	15	—	—	—	—	—	110	70	55	45	40	35	35	35	35	35	35
0.2FS10 / 0.5FS10	20	—	—	—	—	—	145	90	65	55	45	40	40	35	35	35	35
0.2FS10 / 0.5FS10	25	—	—	—	—	—	160	110	75	60	50	45	45	40	35	35	35
0.2FS10 / 0.5FS10	30	—	—	—	—	—	125	85	70	50	55	50	45	40	35	35	35
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	35	30	25	25	25	25	—
0.5	25	—	—	—	95	75	65	55	45	35	30	25	25	25	25	25	—
0.5	30	—	—	—	—	—	65	70	55	45	35	30	25	25	25	25	25
5(10)P10	2.5	135	100	85	75	55	45	40	35	60	30	30	30	30	30	25	25
5(10)P10	5	—	135	120	85	70	55	50	45	40	40	35	35	35	35	30	30
5(10)P10	10	—	—	145	110	95	80	70	60	60	50	45	45	35	35	35	35
5(10)P10	15	—	—	155	130	110	90	80	80	65	60	50	45	40	40	40	40
5(10)P10	20	—	—	115	100	95	85	80	70	70	60	50	45	45	45	45	45
5(10)P10	25	—	—	140	120	115	95	80	70	80	70	60	55	50	50	50	50
5(10)P10	30	—	—	—	—	130	110	110	95	80	70	70	60	55	55	55	55
5(10)P20	2.5	—	145	125	90	75	65	60	50	50	50	45	40	40	35	35	35
5(10)P20	5	—	—	145	115	95	90	75	70	65	55	50	50	45	40	40	40
5(10)P20	10	—	—	—	—	156	125	110	105	85	75	70	60	55	55	55	55
5(10)P20	15	—	—	—	—	150	140	115	100	90	75	70	65	60	60	60	60
5(10)P20	20	—	—	—	—	—	145	125	115	100	90	75	70	65	60	60	60
5(10)P20	25	—	—	—	—	—	—	150	135	105	95	85	80	80	80	80	80
5(10)P20	30	—	—	—	—	—	—	155	120	105	95	85	80	80	80	80	80
5(10)P30	2.5	—	—	130	105	90	85	75	70	65	55	55	55	55	50	50	—
5(10)P30	5	—	—	145	135	115	100	95	80	75	75	75	65	60	60	60	—
5(10)P30	10	—	—	—	—	170	155	125	115	110	90	80	80	80	80	80	—
5(10)P30	15	—	—	—	—	—	155	140	115	100	100	100	100	100	100	100	—
5(10)P30	20	—	—	—	—	—	—	—	140	125	125	125	125	125	125	125	—
5(10)P30	25	—	—	—	—	—	—	—	—	145	145	145	145	145	145	145	—

Engineering Drawing

Specification & Outline Drawing

Original image, not compressed

Dimension & outline drawing of CGIS1775 — click image to zoom / view original.