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Instrument Transformers

Instrument Transformers
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Instrument Transformers

Product catalog summary
Sustainability and Philosophy
Tesar emphasizes sustainability by transforming wind, sun, and water into renewable energy. The company operates under a Quality Operating System compliant with UNI EN ISO 9001 to ensure high-quality standards and environmental protection.

Product Overview
The document provides an overview of various types of instrument transformers, including CEI-UNEL CT, Brick Type CT, DIN CT, Ring Current CT, and various voltage transformers (VTs) for phase-to-phase and phase-to-ground applications.

CEI-UNEL CT
These current transformers are designed according to CEI-UNEL 21009 standards and tested per IEC 61869-1/2. They support insulation levels up to 36 kV and primary currents from 5 to 2500 A. They are suitable for indoor installations with accuracy classes for measurement and protection.

Brick Type CT
Compact transformers for metal-clad switchboards, with insulation levels up to 24 kV. They offer primary currents from 5 to 1250 A and are tested according to IEC 61869-1/2.

DIN CT
These transformers adhere to DIN 42600-8 standards, supporting insulation levels up to 24 kV and primary currents from 5 to 2500 A. They are designed for indoor use with standard secondary terminal boards.

Ring Current CT
Manufactured according to IEC 61869-1/2, these transformers have a rated insulation level of 0.72 kV and support primary currents from 50 to 20,000 A. They are available with optional outdoor installation and ATEX certification.

Voltage Transformers (VTs)
  • CEI-UNEL Phase to Phase VT: Designed per CEI-UNEL 21008 standards, supporting insulation levels up to 36 kV with a rated secondary voltage of 100 V.
  • CEI-UNEL Phase to Ground VT: Supports insulation levels up to 36 kV with two secondary windings for measuring and residual voltage.
  • DIN Phase to Phase VT: Adheres to DIN 42600-9 standards, with insulation levels up to 24 kV and a rated secondary voltage of 100 V.
  • DIN Phase to Ground VT: Similar to the phase-to-phase version but with two secondary windings.
  • Fuse-Holder Phase to Ground VT: Supports insulation levels up to 36 kV with options for additional secondary windings and sealable terminal covers.


Contact Information
The document concludes with contact details for Tesar and its associated companies across Europe, including locations in Italy, Switzerland, Czech Republic, and Poland.
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Catalog excerpts

Instrument Transformers-1

Instrument Transformers Energizing the World since 1979

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Instrument Transformers-2

Sstai nal xear oew_ solar fficient ^-env** v * — greerv enernwr ^ossW power new _____ auto power 9 energy nuclear &*sgg5*SS&&s£i environment cleat - ryV pollution”™ energy global

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Instrument Transformers-3

CEI - UNEL Phase to Phase VT 16 CEI - UNEL Phase to Ground VT 18 Fuse - Holder Phase to Ground VT 24

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Instrument Transformers-4

Our Philosophy Tesar transforms the Wind, the Sun and the Water in renewable Energy. Tesar, in order to improve its redditivity and competitivity, has in force a Quality Operating System UNI EN ISO 9001. In this way, all the activities related to the proper execution of the jobs, are carried out in the full respect of the wealth safeguard as well as of the ambient. Highest Quality

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Instrument Transformers-5

Product Overview CEI-UNEL CT CEI-UNEL Phase to Phase VT CEI-UNEL Phase to Ground VT DIN Phase to Phase VT / Phase to Ground VT Fuse-Holder Phase to Ground VT

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Instrument Transformers-6

General Characteristics General Characteristics • Dimensions according to CEI-UNEL 21009 std • Manufactured and tested acc. to IEC 61869-1/2 • Rated Insulation level up to 36 kV • Frequency 50 or 60 Hz • Rated primary current (Ipr) Single primary current from 5 to 2500 A Double primary current Up to 2 x 300 A change on prim. winding Up to 2 x 1250 A change on sec. winding • Rated secondary current (Isr) 5 A • Short-time current (Ith) up to 40 kA x 1s • Rated dynamic current (Idyn) 2.5 x Ith • Number of secondary 1 or 2 • Security factor ≤ 5 or ≤ 10 • Indoor installation • Accuracy class for measure:...

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Instrument Transformers-10

General Characteristics General Characteristics • Compact type suitable for METAL - CLAD switchboards • Manufactured and tested acc. to IEC 61869-1/2 • Rated Insulation level up to 24 kV • Frequency 50 or 60 Hz • Rated primary current (Ipr) Single primary current from 5 to 1250 A Double primary current Up to 2 x 300 A change on prim. winding Up to 2 x 600 A change on sec. winding • Rated secondary current (Isr) 5 A • Short-time current (Ith) up to 40 kA x 1s • Rated dynamic current (Idyn) 2.5 x Ith • Number of secondary 1 or 2 • Security factor ≤ 5 or ≤ 10 • Indoor installation • Accuracy class...

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Instrument Transformers-12

General Characteristics General Characteristics • Dimensions according to DIN 42600-8 std. • Manufactured and tested acc. to IEC 61869-1/2 • Rated Insulation level up to 24 kV • Frequency 50 or 60 Hz • Rated primary current (Ipr) Single primary current from 5 to 2500 A Double primary current Up to 2 x 300 A change on prim. winding Up to 2 x 1250 A change on sec. winding • Rated secondary current (Isr) 5 A • Short-time current (Ith) up to 40 kA x 1s • Rated dynamic current (Idyn) 2.5 x Ith • Number of secondary 1 or 2 • Security factor ≤ 5 or ≤ 10 • Indoor installation • Sec. terminal board acc....

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Instrument Transformers-13

Sec. Terminal board acc. to DIN Standard Sec. Terminal Board Standard execution Execution with wings

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Instrument Transformers-14

Overall Dimensions Sec. Terminal board acc. to DIN Standard Sec. Terminal Board Standard execution Execution with wings

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Instrument Transformers-15

General Characteristics • Manufactured and tested acc. to IEC 61869-1/2 • Rated Insulation level 0,72 kV • Frequency 50 or 60 Hz • Rated primary current (Ipr) Single primary current from 50 to 20.000 A • Rated secondary current (Isr) 5 A • Short-time current (Ith) up to 40 kA x 1s • Rated dynamic current (Idyn) 2.5 x Ith • Number of secondary 1 • Security factor < 5 or < 10 • Indoor installation • Accuracy class for measure: 0,5 - 0,5s - 0,2 - 0,2s • Accuracy class for protection: 5P10 - 5P20 - 5P30 On Request • Second secondary • Rated secondary current 1A • Terminal cover • outdoor installation...

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Instrument Transformers-16

On Request • Second secondary • Double primary ratio • Sealable terminal cover • Rated secondary voltage 110 V General Characteristics • Dimensions according to CEI-UNEL 21008 std. • Manufactured and tested acc. to IEC 61869-1/3 • Rated Insulation level up to 36 kV • Frequency 50 or 60 Hz • Rated voltage factor 1,2 continuous • Number of secondary 1 • Rated secondary voltage 100 V • Indoor installation • Accuracy class for measure: 0,5 - 0,2 • Accuracy class for protection: 3P-6P Primary Terminals Double Primary Voltage Low Ratio

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Instrument Transformers-18

General Characteristics • Dimensions according to CEI-UNEL 21007 std. • Manufactured and tested acc. to IEC 61869-1/3 • Rated Insulation level up to 36 kV • Frequency 50 or 60 Hz • Rated voltage factor 1,2 continuous and 1,9/8h • Number of secondaries 2 • Rated secondary voltage: Measuring or protective winding: 100:V3 V Residual voltage winding: 100:3 V • Indoor installation • Accuracy class for measure: 0,5 - 0,2 • Accuracy class for protection: 3P-6P On Request • Third secondary • Double primary ratio • Sealable terminal cover • Rated secondary voltage: 110:V3 V - 110:3 V Double Primary Voltage...

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Instrument Transformers-20

General Characteristics On Request • Dimensions according to DIN 42600-9 std. • Second secondary • Manufactured and tested acc. to IEC 61869-1/3 • Double primary ratio • Rated Insulation level up to 24 kV • Standard sec. terminal board • Frequency 50 or 60 Hz • Rated secondary voltage 110 V • Rated voltage factor 1,2 continuous • Number of secondary 1 • Rated secondary voltage 100 V • Indoor installation • Sec. terminal board acc. to DIN • Accuracy class for measure: 0,5 - 0,2 • Accuracy class for protection: 3P-6P High Ratio

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Instrument Transformers-22

General Characteristics • Dimensions according to DIN 42600-9 std. • Manufactured and tested acc. to IEC 61869-1/3 • Rated Insulation level up to 24 kV • Frequency 50 or 60 Hz • Rated voltage factor 1,2 continuous and 1,9/8h • Number of secondary 2 • Rated secondary voltage: Measuring or protective winding: 100:V3 V Residual voltage winding: 100:3 V • Indoor installation • Sec. terminal board acc. to DIN • Accuracy class for measure: 0,5 - 0,2 • Accuracy class for protection: 3P-6P Primary Terminals > C On Request • Second secondary • Double primary ratio • Standard sec. terminal board • Rated...

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.