Piano di Manutenzione apparecchiature assiemate di protezione CEI IEC TR 63482:2024 Allegato A (esempio)

ID 23280 | 12.01.2025 / Documento completo allegato

Il Rapporto Tecnico CEI IEC TR 63482:2024 si occupa della manutenzione di apparecchiature e di apparecchiature assiemate di protezione e di manovra aventi una tensione nominale fino a 1 000 V CA o 1 500 V CC inclusi e progettate per una frequenza nominale dell'alimentazione o delle alimentazioni in ingresso non superiore a 1 000 Hz.

Il Rapporto Tecnico definisce delle linee guida per l’individuazione e la selezione del corretto approccio, per la pianificazione e l'esecuzione di attività di manutenzione.

Nella Tabella A.1 dell’Allegato A vengono forniti esempi di operazioni di manutenzione in base alla tipologia di dispositivi e alla complessità delle operazioni di manutenzione (livello Skills da 1 a 3).

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Extract

Introduction

In the low-voltage domain, the evolution of the IEC 61439 series of standards (low-voltage switchgear and controlgear assemblies) incorporating devices according to IEC 60947 series (low-voltage switchgear and controlgear) have contributed significantly to improve safety, the performance and reliability of assemblies and power availability of low-voltage energy.

To minimize the risk of malfunction due to ageing of the low-voltage assemblies some type of maintenance is implemented depending on local rules, customer maintenance policy or assembly manufacturer instruction relating to the assembly or the built-in components within the assembly. Traditionally, maintenance is scheduled and has been predefined using a fixed schedule.

To avoid malfunctions, the schedules are usually conservative. As new technologies emerge, providing new functionalities and possibilities, for example measurement of equipment temperatures, loads including harmonic content, currents interrupted, climatic conditions, alternative and more effective maintenance approaches are possible. 

A preventive maintenance approach using such technologies can be more cost effective and less disruptive than the traditional schedule-based maintenance arrangements.This document sets out the basic maintenance considerations for low-voltage switchgear, controlgear and their assemblies, which is supplemented by the assembly manufacturer’s instructions. It recognises that the traditional basic approach of maintenance can be improved and enhanced. 

This document shows that it is possible to provide one suitable maintenance approach depending on the current customer’s application, but it is also possible to move to a more advanced maintenance approach, if an assembly is suitably upgraded.

NOTE
It is beneficial to refer to individual product standards and/or manufacturer instruction for further information on devices incorporated in an assembly.

1 Scope

This document provides guidance for the specification and selection of the appropriate approach and for the planning and the execution of the maintenance of low-voltage switchgear and controlgear and their assemblies having a rated voltage up to and including 1 000 V AC or 1 500 V DC, and designed for a nominal frequency of the incoming supply or supplies not exceeding 1 000 Hz.

This document provides guidance on the safety precautions for personnel designed to carry out maintenance services, with the aim to minimize the safety risks, optimize service continuity (power availability) and contribute to the environment of a low-voltage switchgear and controlgear assemblies.

It recognises there are different approaches to maintenance, e.g. scheduled maintenance, condition-based maintenance and predictive maintenance. This document does not consider specifically corrective maintenance but many of the recommendations included would apply when carrying out corrective maintenance. It provides additional recommendations to comply with validation requirements in IEC 60364-6.

This document explains how the use of preventive maintenance improves the efficiency and lifetime of built-in components and consequently the assemblies themselves. All parties (specifiers, owners, designers, manufacturers, maintenance personnel) involved with low-voltage switchgear and controlgear assemblies can benefit from this document. This document applies to both stationary and movable switchgear and controlgear assemblies with or without an enclosure.

It is also applicable to switchgear and controlgear assemblies intended for use under special service conditions, possibly with additional recommendations, for example in ships and rail vehicles. It also applies to low-voltage assembly upgrades which can have additional considerations to ensure modifications are fully verified to the appropriate assembly standard. This document does not apply to low-voltage switchgear and controlgear assemblies used in potentially explosive atmospheres.

Finally, this document is not a substitute for national regulations regarding the safety of electrical equipment and for the manufacturer’s maintenance instructions.

These are required to complement the overall principles defined in this document.

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4.3 Good practice and procedures for establishing a safe working environment

4.3.1 Working procedures

The risk assessment prior to commencing work is the recognized method of identifying safety risks. For maintenance activities on equipment, there is usually a written system of rules and procedures and all personnel involved with maintenance activities are aware of their existence. The level of detail and complexity of the rules and procedures is dependent on the organisation, personnel, working environment and equipment to be used.

The risk assessment process is used to ensure that hazards specific to maintenance activities have been adequately addressed in the development of the associated rules and procedures.

For example, different working practices and competencies are required for work on DC systems than are required for AC systems.

Safety rules set out the principles and practices expected clearly and in a format that can be understood by those expected to use them.

The rules and procedures reflect the requirements of an overall electrical safety policy.

In most circumstances a policy for workingon electrical equipment requires equipment to be deenergised and isolated prior to work commencing.

Safety rules addressing specific issues such as circuits associated with:

- interlocking and padlockingsupplies;
- auto-reclosing devices;
- alternative supplies including generators, battery supplies, photovoltaic (PV), wind power;
- mechanically stored energy;
- capacitively stored energy; and/or
- control supplies (AC and DC).

All personnel are made aware to take notice of warning signs and follow instructions provided by the assembly manufacturer.

Product standards are recommended to include minimum requirements for the maintenance instructions to be provided by the manufacturer.

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8 Implementation and management of maintenance

8.1 General

Throughout its working life an assembly will u ndergo appropriate maintenance. Subject to the manufacturer’s documentation, maintenance of devices and assemblies is either scheduled, condition based, predictive or a combination of two or more the types of maintenance. For an example of a maintenance plan see Annex A.

It is good practice to make sure software is available and can be modified as necessary, throughout the necessary anticipated lifetime of the assembly. Equally, necessary spares are available when required.

Preventive maintenance is organized on the basis of inspections supplemented with operational checks followed by examination. The inspections and checks are of such a frequency to ensure that no undue damage or excessive wear is sustained in the course of operations since the last maintenance action. Examinations can be carried out to evaluate the possibly for reconditioning of the contact systems, lubrication and adjustment of mechanisms or deterioration of insulation. The appropriate intervals for examination are determined from the outcome of inspections or operational checks or are based on manufacturer’s documentation, taking into account operating duty, environmental conditions and the potential effects of failure. Inspection and testing of insulation are undertaken during examination. The different maintenance operations are based on different level of skills.

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8.2.2 Skill level 1

Tasks are simple actions undertaken by an instructed person following simple instructions and without exposure to hazardous live parts.

Examples of the tasks as:

- cleaning of the assembly;
- visual inspection of the operation of displays (indicator lights, actuators, mechanical indicators, etc.);
- visual inspection of b arriers, shutters, covers doors and door locks;
- visual inspection of conditions (temperature, dust, humidity, etc.);
- visual inspection of mains and auxiliary cable conditions and their terminations;
- confirming protection settings are in accordance with the protection scheme;
- replacing fan filter in assemblies with forced ventilation.

8.2.3 Skill level 2

Tasks are complex, require knowledge, training, supporting information and engineering judgment. They are undertaken by a skilled person who understands the risks associated with partially energised equipment.

Examples of the tasks as:

- they are undertaken by a skilled person who understands the risks associated withenergised equipment;
- verification insulation, busbar joints according to maintenance documentation;
- verification of effective earth continuity according to maintenance documentation;
- reviewing the wear and of ageing of components, e.g. erosion of main contacts and arc chutes.

8.2.4 Skill level 3

Operations with procedures require the mastering of a particular technique or technology and / or the use of specialized supporting equipment.

These tasks are carried out by personnel with specialist skills, for example the assembly manufacturer or an organisation with the same expertise, and include:

- Verification and update of software according to maintenance documentation;
- Incorporation of alternative devices when the original type is no longer available;
- Verification according to maintenance documentation of mechanical and/or electrical interlocks where applicable.

NOTE
Due to the different specialist skill level, software related tasks and the installation of alternative devices are not necessarily carried out by the same person.

Table 1 classifies the maintenance operation in three levels in regard to their complexity and the necessary skills for each level.

Table 1 - Maintenance operation level

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Annex A (informative)

Maintenance plan according to maintenance level

The following Table A.1 give examples of maintenance operation related with the type of devices and the complexity of the operation of maintenance.

Table A.1 - Maintenance plan

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