SIST EN 61334-3-21:1997

• Abstract:

  Establishes definitions, requirements, methods of testing and rated values for phase-to-phase isolated capacitive coupling devices to be used in medium-voltage (MV) distribution line carrier systems.

• Status: Published
• Publication Date: 31-Jul-1997
• ICS: 33.040.50 - Lines, connections and circuits
• Technical Committee: PSE - Power systems management
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Aug-1997
• Due Date: 01-Aug-1997
• Completion Date: 01-Aug-1997
• Ref Project: EN 61334-3-21:1996 - Distribution automation using distribution line carrier systems - Part 3: Mains signaling requirements - Section 21: MV phase-to-phase isolated capacitive coupling device

• Refers: SIST HD 472 S1:1996 - Nominal voltages for low-voltage public electricity supply systems
• Effective Date: 03-Feb-2026
• Refers: SIST EN 60071-1:2001 - Insulation co-ordination -- Part 1: Definitions, principles and rules
• Effective Date: 03-Feb-2026
• Refers: SIST EN 60721-1:2001 - Classification of environmental conditions -- Part 1: Environmental parameters and their severities
• Effective Date: 03-Feb-2026

SIST EN 61334-3-21:1997 is a Slovenian standard from SIST for distribution automation using distribution line carrier systems. It covers the MV phase-to-phase isolated capacitive coupling device used in medium-voltage mains signaling, and it specifies the definitions, requirements, test methods and rated values that engineers, manufacturers, test labs and buyers need when selecting or verifying this equipment.

What does SIST EN 61334-3-21:1997 specify?

SIST EN 61334-3-21:1997 specifies the technical basis for a phase-to-phase isolated capacitive coupling device used in MV distribution line carrier systems. It is part of the series on distribution automation using distribution line carrier systems, and it sits in Part 3, which covers mains signaling requirements.

In practice, the standard tells users what the device is for, how it is characterized, and how it is checked. That matters when a utility or manufacturer needs a common specification for signaling equipment that works on distribution lines.

The scope given for SIST EN 61334-3-21:1997 is narrow and focused:

• phase-to-phase isolated capacitive coupling devices
• medium-voltage (MV) distribution line carrier systems
• definitions, requirements, methods of testing and rated values

The document is identified as the Slovenian version of EN 61334-3-21:1996. That makes it the national adoption of the same technical content.

What are the key requirements of SIST EN 61334-3-21:1997?

SIST EN 61334-3-21:1997 sets out the information needed to specify, test and rate a phase-to-phase isolated capacitive coupling device for MV line carrier use. The main practical point is that the standard is not about general distribution automation - it is about one specific coupling device and the technical data needed to use it correctly.

Device definition and application

SIST EN 61334-3-21:1997 defines the device class covered by the standard: a phase-to-phase isolated capacitive coupling device. That matters because the coupling arrangement is part of how signaling is injected or taken from the medium-voltage network.

For engineers, this means the standard is the reference when the design or procurement question is specifically about this kind of capacitive coupling device, not another form of coupling arrangement.

Requirements for the coupling device

SIST EN 61334-3-21:1997 includes requirements for the device. The scope does not list those requirements one by one, but it makes clear that the standard is intended to define what the device must satisfy in order to be used in MV distribution line carrier systems.

For buyers and quality managers, this is the part of the standard that supports supplier specification and conformity checking. For manufacturers, it is the basis for designing the device to a recognizable technical target.

Methods of testing

SIST EN 61334-3-21:1997 provides methods of testing. In practical terms, this means the standard is not limited to design intent - it also gives the verification route for checking the device against the stated requirements.

Test engineers use this kind of content to decide how to examine the device and what evidence is needed before acceptance, type approval or routine verification.

Rated values

SIST EN 61334-3-21:1997 includes rated values for the coupling device. Rated values are important because they give the declared working basis for specification, comparison and ordering.

In practice, this helps when a utility or integrator needs to match the device to the MV system and to the signaling application. It also gives a common language for datasheets and procurement documents.

Use in MV distribution line carrier systems

SIST EN 61334-3-21:1997 applies to MV distribution line carrier systems. That tells the reader where the device belongs in the network and why the technical detail matters: it is part of communication over the power distribution infrastructure.

This is the link between the device and the system use case. It helps the reader understand that the standard is relevant where signaling must coexist with distribution operation.

Position in the series

SIST EN 61334-3-21:1997 is Part 3, Section 21 of the distribution automation using distribution line carrier systems series. That structure matters because it tells users that the document belongs to the mains signaling requirements part of the series and addresses one defined device category.

For anyone navigating the series, this helps distinguish system-level requirements from device-specific requirements.

What terms does SIST EN 61334-3-21:1997 define?

SIST EN 61334-3-21:1997 is centered on a small set of technical terms used to describe the device and its application.

• Medium-voltage (MV) - the voltage class covered by the standard, meaning the device is intended for medium-voltage distribution systems.
• Distribution line carrier systems - communication systems that use distribution lines as the medium for carrying signals.
• Mains signaling - signaling carried over the power network rather than over a separate communication line.
• Phase-to-phase isolated capacitive coupling device - a capacitive coupling device arranged between phases with isolation, used to couple signaling to the line.
• Rated values - the declared values used to describe the device’s intended operating basis and to compare products.
• Testing methods - the procedures used to verify that the device meets the standard’s requirements.
• Requirements - the technical conditions the device is expected to satisfy for its intended use.

Who uses SIST EN 61334-3-21:1997?

SIST EN 61334-3-21:1997 is used by people who specify, design, test, buy or approve MV signaling equipment for distribution networks.

Typical users include:

• utility engineers working on distribution automation
• protection and control engineers
• manufacturers of capacitive coupling devices
• test laboratories checking device performance
• quality managers reviewing conformity evidence
• buyers and technical procurement teams preparing specifications

They use the standard to align the device with the MV network, to ask for the right rated values, and to verify the device by a common test method.

What changed in SIST EN 61334-3-21:1997 from the previous edition?

SIST EN 61334-3-21:1997 is identified as the Slovenian standard identical to EN 61334-3-21:1996. The document relation given is equivalence to that EN edition.

What does the SIST EN 61334-3-21:1997 document contain?

SIST EN 61334-3-21:1997 contains the technical material needed to describe and verify a phase-to-phase isolated capacitive coupling device for MV distribution line carrier systems. Its content is centered on definitions, requirements, methods of testing and rated values, which together support specification and verification work.

For a reader in practice, that means the document is useful at several points in the equipment lifecycle - design, supplier selection, testing and acceptance. It provides the framework for comparing devices and for checking that a proposed coupling device fits the intended MV signaling application.

The standard’s place in Part 3 also shows its role in the wider series on mains signaling requirements. It is a device-focused document within a broader distribution automation context.

SLOVENSKI STANDARD
01-avgust-1997
Distribution automation using distribution line carrier systems - Part 3: Mains
signalling requirements - Section 21: MV phase-to-phase isolated capacitive
coupling device
Distribution automation using distribution line carrier systems -- Part 3: Mains signaling
requirements -- Section 21: MV phase-to-phase isolated capacitive coupling device
Verteilungsautomatisierung mit Hilfe von Trägersystemen auf Verteilungsleitungen -- Teil
3: Netzbedingte Anforderungen an die Signalübertragung -- Hauptabschnitt 21: Kapazitiv
getrennte Außenleiter-Außenleiter-Ankopplungseinrichtungen für Mittelspannung
Automatisation de la distribution à l'aide de systèmes de communication à courants
porteurs -- Partie 3: Prescriptions concernant la transmission des signaux sur le secteur -
- Section 21: Dispositif de couplage phase-phase capacitif isolé MT
Ta slovenski standard je istoveten z: EN 61334-3-21:1996
ICS:
33.040.50 Vodi, zveze in tokokrogi Lines, connections and
circuits
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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