05-Current transformers Summation-Analogue Output

Product catalog summary

Overview
This document provides technical specifications and application details for current transformers manufactured by Celsa Messgerate España S.L. It covers various models including SSR, SCMU210s, and SCMU/I, detailing their electrical and mechanical features, as well as installation guidelines.

Summation Current Transformers (SSR)
The SSR models (SSR-2 to SSR-9) are designed to sum instantaneous values of different currents in a network, providing a proportional alternating current. They require several main transformers with secondary windings connected to the primary windings of the summation transformer. All primary windings must be connected to the same phase. The standard configuration is for transformers with the same transformation ratio, but different ratios can be specified upon order.

Technical Features

Highest voltage equipment: 720 V
Rated insulation level: 4 kV, 1 min.
Rated short-time thermal current (Ith): 60 x IN
Rated dynamic current (Idyn): 2.5 x Ith
Frequency range: 50 - 60Hz
Internal consumption: Max. 4 VA
Thermal class of insulation: E
Accuracy class index and burden: Class 0.5 and Class 1, both 15 VA

Mechanical Features

Housings: Self-extinguishing polycarbonate UL94 V-0
Protection degree: IP40
Fixing: DIN-rail DIN EN50022 or screw fastening
Connection: Nickel plated secondary terminals with plus-minus screws
Protection degree of connection: IP10, with optional secondary terminal cover = IP20
Weight: D10 = 400g, D20 = 600g

SCMU210s and SCMU Models
These models combine current transformers and transducers in one housing, offering standard analogue outputs of 0-20 mA or 0-10 V. They are available for primary currents ranging from 30 A to 600 A. The SCMU/I model also offers an output of 4-20 mA and requires an auxiliary supply of either 230 VAC or 24 VDC.

Applications
The measured primary current is galvanically insulated, rectified, and converted into a proportional and load-independent DC signal. The SCMU210s model does not require an auxiliary supply, while the SCMU/I model does. All models include snap-on mounting for DIN-rail and necessary mounting accessories.

Ordering Information
Orders should specify the model, primary current range, output type, and for SCMU/I, the auxiliary supply voltage.

Catalog excerpts

05-Current transformers Summation-Analogue Output-1

CURRENT TRANSFORMERS Summation current transformers SSR The summation current transformers SSR-2 to SSR-9 sums up the instantaneous values of diffrent currents in a network, providing a proportional alternating current. In order to that, several measuring transformers (main transformers) are used, one for each current, with their secondary windings connected to the primary windings of the summation transformer. All the primary windings of the summation current transformer must be connected to the same phase. If any of the primary windings of the SSR are not to be used, they must be left open. The standard execution is prepared for main transformers of the same transformation ratio. Otherwise, please indicate their ratios in your order. Celsa Messgerate España S.L. www.celsamessgerate-spain.com [email protected] / +34 96 130 93 78

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05-Current transformers Summation-Analogue Output-2

CURRENT TRANSFORMERS SSR Technical Features Electrical Features Hightest voltage equipment: Rated insolation leve: Rated shot-time thermal current (Ith): Rated dynamic current (Idyn): Frecuency range: Internal consumption: Thermal class of insulation: Accuracy class index and burden Class 0,5 Mechanical Features Housings Protection degree DIN-rail DIN EN50022 or screw fastening Nickel plated secondary terminals with plus minus screws Protection degree of connection IP10, with secondary terminal cover = IP20 (option) Hightest proportion for different ratios of main c.t`s Housing size SSR Technical...

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05-Current transformers Summation-Analogue Output-3

CURRENT TRANSFORMERS SCMU210s Current Transformer and transducer in one housing • from 30 up to 50 A • Standard analogue output 0 - 20 mA / 0 - 10 V SCMU210s - Available metering ranges Application The measured quantity (i.e. primary current) is galvanically insulated (5kV/1 min), rectified (mean value principle) and converted into a proportional and load-independent DC signal current (or voltage). The passive type SCMU210s does not require auxiliary supply. Snap-on mounting for DIN- rail, mounting brackets for mounting plates and screws for the busbar fixing are included in delivery. Celsa Messgerate...

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05-Current transformers Summation-Analogue Output-4

CURRENT TRANSFORMERS SCMU Current Transformer and transducer in one housing • from 60 up to 600 A • Standard analogue output 0 - 20 mA / 0 - 10 V SCMU - Available metering ranges Output Ouput 0-20mA 0-10V without auxiliary supply min), rectified (mean value principle) and converted into a proportional and load-independent DC signal current (or voltage). The passive type SCMU210s does not require auxiliary supply. The measured quantity (i.e. primary current) is galvanically insulated (5kV/1 Snap-on mounting for DIN- rail, mounting brackets for mounting plates and screws for the busbar fixing are...

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05-Current transformers Summation-Analogue Output-5

CURRENT TRANSFORMERS SCMU/I Current Transformer and transducer in one housing • from 10 up to 600 A • Standard analogue output 4 - 20 mA • Auxiliary supply: 230 VAC or 24 VDC SCMU/I - Available metering ranges Output 4-20mA Auxiliary supply Auxiliary supply 230V AC 24V DC min), rectified (mean value principle) and converted into a proportional and load-independent DC signal current (or voltage). The active SCMU/I con- nects to a auxiliary supply of 230 VAC or 24 VDC. These information have Snap-on mounting for DIN- rail, mounting brackets for mounting plates and screws for the busbar fixing are...

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