LoW-VoLtaGes Current transformes
LoW-VoLtaGes Current transformes
For over sixty years, Lumel has been a global provider of high-standard, safe, and user-friendly products, supported by skilled specialists.
The document covers current transformers, detailing their specifications, types, applications, and ordering information.
This section outlines various types of current transformers, including wound primary, round conductor, busbar, split core, 3-phase, resin cast, and round transformers. It specifies their primary current ranges, hole diameters, and accuracy classes.
Current transformers measure high electric alternating currents by producing a reduced current proportional to the primary current, isolating measuring instruments from high voltage circuits. They feature a wide range of accuracy classes, mounting methods, and comply with IEC 61869-1/2 standards.
- Applicable Standard: IEC 61869-1/2
- Case Material: Glass-filled polycarbonate or epoxy resin
- Insulation Class: E (120°C max)
- Maximum System Voltage: 0.72 kV
- Test Voltage: 4kV, 1 min, 50Hz
- Operating Frequency: 50/60 Hz
- Rated Primary Rating: 1 A to 7500 A
- Rated Secondary Output: 5 A or 1 A
- Accuracy Classes: 0.2, 0.2S, 0.5S, 0.5, 1, 3
- Temperature Range: -25°C to +40°C (ambient), -10°C to +55°C (operating), -50°C to +80°C (storage)
The document details the instrument security factor (FS) for various transformer types, ensuring protection against overloads and surges.
Power requirements for measuring devices and relays are specified, with internal losses of copper wiring detailed for different wire cross-sections and distances.
The document provides comprehensive information on the specifications, applications, and safety features of current transformers, ensuring accurate and secure measurement of electrical currents.
The document provides detailed specifications and ordering information for various types of transformers, including LCTB, LCTS, LCTP, and LRC series. These transformers are used for different primary current ranges and have specific secondary current outputs, accuracy classes, and transformer burdens.
- Primary and Secondary Currents: Transformers are available for primary currents ranging from 60 A to 7500 A, with secondary currents of 1 A or 5 A.
- Accuracy Classes: The accuracy classes include 0.2S, 0.2, 0.5S, 0.5, 1, and 3, depending on the transformer type and application.
- Transformer Burden: The burden varies with the primary current and accuracy class, ranging from 1 VA to 100 VA.
- LCTB Series: Includes models like LCTB 104/60 and LCTB 140/80, suitable for busbar applications with specific hole diameters and dimensions.
- LCTS Series: Split core transformers with window dimensions and depths specified for different models, such as LCTS 93/30SC.
- LCTP Series: 3-phase busbar transformers with models like LCTP 75/15, designed for specific busbar sizes and primary current ranges.
- LRC Series: Resin cast transformers with models like LRC1 80/30, designed for specific hole diameters and primary current ranges.
Each transformer type has a specific ordering code format that includes the transformer type, primary current, secondary current, and accuracy class. Examples are provided to illustrate how to construct these codes.
- Various accessories are available, such as terminal caps, DIN rail plates, wall mounting clamps, and thread cutting screws. These are ordered separately and have specific order codes.
- Transformers are made with self-extinguishing plastic cases, have an insulation class of E, and operate at a frequency of 50/60 Hz.
- They are designed for a maximum system voltage of 0.72 kV and have a test voltage of 3 kV for 1 minute.
- LUMEL is a leading European manufacturer of electrical devices for automation and high-pressure aluminum castings, established in 1953.
- The company focuses on producing devices for measurement, conversion, control, recording, transmission, and visualization of industrial processes.
Catalog excerpts
LOW-VOLTAGES CURRENT TRANSFORMES
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For over sixty years we have been providing you with all what you need, working in accordance with the highest standards. Every day thousands of our clients all over the world get our safe and user-friendly products. It wouldn’t be possible without power and skills of our best specialists. We remember about every single detail
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GeneraL oVerVieW of Current transformers CUrrenT TrAnSFormer is used for measurement of electric alternating currents. When current in a circuit (primary current) is too high to directly applyto measuring instruments, a current transformer produces a reduced current (secondary current) accurately proportional to the current in the circuit, which can be conveniently connected to measuring and recording instruments. A current transformer also isolates the measuring instruments from what may be very high voltage in the monitored circuit. Relationship between primary and secondary currents is called...
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GeneraL oVerVieW of Current transformers Power requirements for measuring apparatur and relays: • Analog moving-iron meters 0.7 – 1.5VA • Rectifier current meters 0.001 – 0.250 VA • Multi-range current meters 0.005 – 5.000 VA • Current recorders 0.300-9.000 VA • Bimmetalic ammeters 2.5 – 3.0 VA • Power meter 0.2 – 5.0 VA • Power factor meter 2.0 – 6.0 VA • Meters 0.4 – 1.0 VA • Relays 0.2 – 6.0 VA • Power transducers 0.5 VA • Energy meters 2.5 VA Internal losses of copper wiring: ConneCtion DiaGramm of Current transformers Where: I – Secondary nominal current, L – Distance in [m], qCU – wire...
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LCTB - busbar series
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LCTM - WOUND PRIMARY SERiES LCTM 62/W (40) LCTM 62W040 G D D D D D ODGDG ORDERING CODESLCTM 74W045 DD DDDD Secondary current Secondary current ACCESSORIES: DIN rail mounting base Order code: LH000-0904-130-124 Ordering example: Order code LCTM 62W0400030A55 means the transformer LCTM 62/W(40) 30/5A; Class 0.5; power 2.5VA
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INPUT: OUTPUTS: DIMENSIONS ORDERING CODES Transformer type Transformer type Accuracy class rated primary current 30 A 40 A 50 A 60 A 75 A 80 A 100 A 120 A 125 A 150 A 200 A 250 A 300 A Rated primary current 40 A 50 A 60 A 75 A 80 A 100 A 120 A 125 A 150 A 200 A 250 A 300 A ordering example: Order code LCTR 4514400100A55 means the transformer LCTR 45/14(40) 100/5A meeting the requirements of the class: • kl. 0.5 1 .5 VA
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ORDERING CODES □□□□□□□ Secondary current Secondary current * The custom value of the nominal power, which should be given when ordering the transformer. Ordering example: Order code LCTR 5014500100A55 means the transformer LCTR 50/14(50) 100/5A meeting the requirements of the class: • kl. 0.5 3 .75 VA ACCESSORIES: DIN rail mounting base - for details see page 46
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Ordering example: Order code LCTB 4521400100A55 means the transformer LCTB 45/21(40) 100/5A meeting the requirements of the class: • kl. 0.5 1.5 VA • kl. 1 3.75 VA • kl. 3 3.75 VA ACCESSORIES: DIN rail mounting base Order code: LH000-0904-130-002
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INPUT: OUTPUTS: LCTB 50/21 (30) ORDERING CODES Secondary current Secondary current Ordering example: Order code LCTB 5021300100A55 means the transformer LCTB 50/21(30) 100/5A meeting the requirements of the class: kl. 0.5 1.5 VA; kl. 1 2.5 VA; kl. 3 3.75 VA * The custom value of the nominal power, which should be given when ordering the transformer.
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ORDERING CODES Ordering example: Order code LCTB 5021500100A55 means the transformer ACCESSORIES: LCTB 50/21(50) 100/5A meeting the requirements of the class: DIN rail mounting base
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INPUT: OUTPUTS: ORDERING CODES
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LCTB 62/30 (50) ORDERING CODES Secondary current Secondary current * The custom value of the nominal power, which should be given when ordering the transformer. Ordering example: Order code LCTB 6230500100A55 means the transformer ACCESSORIES: LCTB 62/30(50) 100/5A meeting the requirements of the class: DIN rail mounting base
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INPUT: OUTPUTS: ORDERING CODES Ordering example: Order code LCTB 7420450100A55 means the transformer LCTB 74/20(45) 100/5A meeting the requirements of the class: kl. 0.5 - 5 VA; kl. 1 - 7.5 VA ; kl. 3 - 10 VA
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ORDERING CODES * The custom value of the nominal power, which should be given when ordering the transformer. ACCESSORIES: DIN rail mounting base Order code: LH000-0904-130-124 Ordering example: Order code LCTB 7450450300A55 means the transformer LCTB 74/50(45) 300/5A meeting the requirements of the class: kl. 0.5 - 5 VA; kl. 1 - 7.5 VA; kl. 3 - 7.5 VA
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INPUT: OUTPUTS: LCTB 86/50 (45) LCTB 86/60 (45) ORDERING CODES Ordering example: Order code LCTB 8640450100A55 means the transformer LCTB 86/40(45) 100/5A meeting the requirements of the class: • kl. 0.5 1.5 VA
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Secondary current Ordering example: Order code LCTB 8650450300A55 means the transformer LCTB 86/50(45) 300/5A meeting the requirements of the class: ACCESSORIES: DIN rail mounting base Order code: LH000-0904-130-124
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INPUT: OUTPUTS: ORDERING CODES LCTB 100130 Secondary current Secondary current Transformer type Accuracy class Code LCTB 100/130V (45) 0.2 rated primary current 400 A 500 A 600 A 750 A 800 A 1000 A 1200 A 1250 A 1500 A 1600 A 2000 A 2500 A 3000 A Transformer burden Code 5 VA 5 VA 5 VA 5 VA 5 VA ordering example: Order code LCTB 1001001500A55 means the transformer LCTB 100/100V(45) 1500/5A meeting the requirements ofthe class: kl. 0.5 - 15 VA; kl. 1 - 30 VA ; kl. 3 - 30 VA
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ACCESSORIES: DIN rail mounting base Order code: LH000-0904-130-124
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Secondary current Secondary current Ordering example: Order code LCTB 1408041500A55 means the transformer LCTB 140/80(45) 1500/5A meeting the requirements of the class: kl. 0.5 - 60 VA; kl. 1 - 60 VA ; kl. 3 - 60 VA
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ORDERING CODES Secondary current Secondary current Ordering example: Order code LCTB 14010V1000A55 means the transformer LCTB 140/100V(45) 1000/5A meeting the requirements of the class: • kl. 0.5 15 VA
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Ordering example: Order code LCTB 2251251500A55 means the transformer LCTB 225/125(50) 1500/5A meeting the requirements ofthe class: kl. 0.5 - 15 VA; kl. 1 - 30 VA ; kl. 3 - 30 VA
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