Instrument current transformers
Operating manuals
Certificates
Features of the use of current transformers with accuracy class S
Requirements for placing orders for transformers intended for export
The inter-verification interval is 16 years.
Sample of filling out an application for the plant's products
Information for designers!
Current transformer with windings for protection of accuracy class 5PR, 10 PR
| Support current transformers TOP-0.66, bus current transformers TShP-0.66 Voltage class: 0.66 kV Rated primary current: 1-2000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S |
| Support current transformers TOP-0.66-I and bus current transformers TShP-0.66-I Voltage class: 0.66 kV Rated primary current: 1-600 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S |
| Busbar current transformers TShP-0.66-IV Voltage class: 0.66 kV Rated primary current: 100-2500 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 5P; 10P |
| Bus current transformers TShL-0.66 and TShL-0.66-I Rated primary current: 600-5000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P |
| Busbar current transformers TSHL-0.66-II Rated primary current: 300-2500 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 1 |
| Busbar current transformers TSHL-0.66-III Rated primary current: 100-4000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2S; 1 |
| Busbar current transformers TSHL-0.66-III-3-2(3) Rated primary current: 300-3000 A Rated secondary current: 1 A; 5 A Accuracy class: 0.2;0.2S; 0.5; 0.5S |
| Busbar current transformers TSHL-0.66-III-4 !!! NEW!!! Rated primary current: 5000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P |
| Busbar current transformers TSHL-0.66-IV Rated primary current: 100-600 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 5P; 10P |
| Bus current transformers TSHL-0.66-V-1 Split instrument transformer Rated primary current: 300-1000 A Rated secondary current: 5 A Accuracy class: 1; 0.5 |
| Busbar current transformers TSHL-0.66-VI Rated primary current: 200-1200 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 5P; 10P |
| Busbar current transformers TSHL-0.66-VII !!! NEW!!! Rated primary current: 100-2500 A Rated secondary current: 1, 2 or 5 A Accuracy class: 0.2; 0.2S; 0.5; 0.5S; 1; 3; 10; 5P; 10P |
| Busbar current transformers TSHL-0.66-VIII !!! NEW!!! Rated primary current: 100-600 A Rated secondary current: 1-5 A Accuracy class: 0.2; 0.2S; 0.5; 0.5S; 1; 3; 5; 5P; 10P |
| Busbar current transformers TNSHL-0.66 Rated primary current: 75-10000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P |
| Bus current transformer TNSh-0.66 Rated primary current: 15000, 25000 A Rated secondary current: 5 A Accuracy class: 10P |
| Busbar current transformers TSHLG-0.66 Rated primary current: 3000-30000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S |
| Support current transformers TOL-10 Voltage class: 6, 10 kV Rated primary current: 10-2000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 1; 5P; 10P Number of secondary windings: 2 or 3 |
| Support current transformers TOL-10-I Voltage class: 6, 10 kV Rated primary current: 5-2000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 2, 3 or 4 |
| Support current transformers TOL-10-M Voltage class: 10 kV Rated primary current: 5-4000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 5P; 10P Number of secondary windings: 2, 3 or 4 |
| Reference current transformer TOL-10-8 Voltage class: 6, 10 kV Rated primary current: 10-2000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 2 or 3 |
| Support current transformers TOL-10-9 Voltage class: 6, 10 kV Rated primary current: 5-2000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 2, 3 or 4 |
| Support current transformers TOL-10-11 Voltage class: 6, 10 kV Rated primary current: 10-3000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 2 Reduced overall dimensions - only 210 mm in length! |
| Support current transformers TOL-10-IM Voltage class: 6, 10 kV Rated primary current: 10-2000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 2, 3 or 4 |
| Support current transformers TOL-10 III for outdoor installation Voltage class: 6, 10 kV Rated primary current: 5-2000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 2 or 3 |
| Busbar current transformers TSHL-10 Voltage class: 10 kV Rated primary current: 1000-5000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 2 or 3 |
| Busbar current transformers TLSH-10 Voltage class: 10 kV Rated primary current: 1000-6000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 2, 3, 4, 5 or 6 |
| Feed-through current transformers TPL-10-M Voltage class: 10 kV Rated primary current: 5-2000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 2, 3 or 4 |
| Feed-through current transformers TPOL-10 Voltage class: 10 kV Rated primary current: 20-2000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 2 or 3 |
| Feed-through current transformers TPOL-10-4 Voltage class: 10 kV Rated primary current: 20-2000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 2 or 3 |
| Feed-through current transformers TPOL-10M Voltage class: 10 kV Rated primary current: 20-3000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 2, 3 or 4 |
| Feed-through current transformers TPOL-10 III and TPL-15 I Voltage class: 10 kV Rated primary current: 50-1000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 1 or 2 |
| Feed-through current transformers TL-10 Voltage class: 10 kV Rated primary current: 50-3000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 2 or 3 |
| Feed-through current transformers TL-10-M Voltage class: 10 kV Rated primary current: 5-2000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 2, 3 or 4 |
| Feed-through transformers TPLK-10 Voltage class: 10 kV Rated primary current: 10-2000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 2 or 3 |
| Support current transformers TOLK-6, TOLK-6-1 Voltage class: 6 kV Rated primary current: 10-600 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 1 |
| Support current transformers TOLK-10, TOLK-10-2 Voltage class: 10 kV Rated primary current: 10-600 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 1 |
| Reference current transformers TOLK-10-1 Voltage class: 10 kV Rated primary current: 10-600 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 2 |
| Support current transformers TOL-20 Voltage class: 20 kV Rated primary current: 5-2500 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 2, 3 or 4 |
| Busbar current transformers TSHL-20-I Voltage class: 20 kV Rated primary current: 3000-18000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 2 or 3 |
| Pass-through current transformers TPL-20 and TPL-35 Voltage class: 20 or 35 kV Rated primary current: 300-4000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 2, 3 or 4 |
| Feed-through current transformers TPL-27 III !!! NEW!!! Voltage class: 27 kV Rated primary current: 600 A Rated secondary current: 5 A Accuracy class: 5P, 10P Number of secondary windings: 1 |
| Feed-through current transformers TPL-35 III !!! NEW!!! Voltage class: 35 kV Rated primary current: 100-1200 A Rated secondary current: 1.2.5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 1 Number of secondary windings: 1, 2 or 3 |
| Support current transformers TOL-35 Voltage class: 35 kV Rated primary current: 15-3000 A Rated secondary current: 1-5 A Accuracy class: 0.5S; 0.2S; 10P Number of secondary windings: 3, 4 or 5 |
| Support current transformers TOL-35-III-IV Voltage class: 35 kV Rated primary current: 100-2000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 1, 2 or 3 |
| Reference current transformer TOL-35 III-7.2 Voltage class: 35 kV Rated primary current: 10-2000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 1, 2, 3 or 4 |
| Support current transformers TLK-35 Voltage class: 35 kV Rated primary current: 5-3000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 2, 3 or 4 |
| Support current transformers TOM-110 III Voltage class: 110 kV Rated primary current: 20-4000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 1; 3; 5P; 10P Number of secondary windings: 3, 4, 5 or 6 |
| Support current transformers TOL-110 III Voltage class: 110 kV Rated primary current: 20-2000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 1; 3; 5P; 10P Number of secondary windings: 3, 4, 5 or 6 |
| TV series outdoor current transformers Voltage class: 35, 110 and 220 kV Rated primary current: 100-3000 A Rated secondary current: 1-5 A Accuracy class: 0.5; 0.5S; 0.2; 0.2S; 10P Number of secondary windings: 1 or 3 |
| TV series current transformers |
| TZRL detachable current transformer for protection Rated primary current: 600-2000 A Accuracy class: 10P |
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Design and principle of operation of a current transformer
Current transformers are structurally composed of:
- closed magnetic circuit;
- 2 windings (primary, secondary).
Since the resistance of the measuring devices is insignificant, it is generally accepted that all current transformers operate in a mode close to a short circuit.
This means that the geometric sum of the magnetic fluxes is equal to the difference in the fluxes generated by both windings.
Traditionally, current transformers are produced with several groups of secondary windings, one of which is intended for connecting protection devices, the others for connecting control, diagnostic and metering devices.
A load must be connected to these windings.
Its resistance is strictly regulated, since even a slight deviation from the standardized value can lead to an increase in error and, as a consequence, a decrease in the quality of measurement and non-selective operation of the relay.
Watch an interesting video about current transformers below:
The CT error is determined depending on:
- magnetic circuit sections;
- permeability of the material used for the production of the magnetic core;
- the magnitude of the magnetic path.
A significant increase in load resistance in the secondary circuit generates increased voltage in the secondary circuit, which leads to insulation breakdown and, as a consequence, failure of the transformer.
The maximum load resistance value is indicated in the reference materials.
