Technical Guide TG 1.

1552

MiCOM P225

CHAPTER 8-1
Handling and Safety
Technical Guide TG 1.1552
Handling and Safety CHAPTER 8-1
MiCOM P225 Page 1/8

CONTENT

1. GENERAL 3
1.1 Reception of the relays 3
1.2 Electrostatic discharge (ESD) 3

2. HANDLING ELECTRONIC EQUIPMENT 3

3. INSTALLING THE RELAYS 4

4. UNPACKING 4

5. STORAGE 4

6. SAFETY INSTRUCTIONS 5

7. INSTALLATION, COMMISSIONING AND MAINTENANCE 6

7.1 Connection of the MiCOM P225 relay 6
7.2 Operating conditions of the MiCOM P225 relay 6
7.3 Replacement of the batteries 6
7.4 Current transformer circuits 6
7.5 Dielectric withstand test 6
7.6 Removal and destruction of the MiCOM P225 relay 6
7.6.1 Removal 6

7.6.2 Destruction 7

7.7 Technical specifications 7

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Technical Guide TG 1.1552
Handling and Safety CHAPTER 8-1
MiCOM P225 Page 3/8

1. GENERAL
1.1 Reception of the relays
Protection relays are generally robust. However it is appropriate to treat them with
care before installing them on site. As soon as they arrive, the relays should be
examined immediately, looking for any deterioration which could have occurred
during transport. If there is any deterioration, make a claim against the forwarding
company and inform ALSTOM T&D Protection & Control as soon as possible.
Relays not intended for immediate installation must be stored in their protective
polyethylene packaging.
1.2 Electrostatic discharge (ESD)
Relays use components sensitive to electrostatic discharges. The electronic circuits are
well protected by the metal housing. Consequently, the internal module must not be
taken out pointlessly. When handling the module outside its housing, be very careful
to avoid any contact with electrical connections and components. If it is removed
from its housing for storage, the module must be placed in electrically conductive
antistatic packaging.
No configuration setting is possible in the module. We therefore advise you not to
dismantle it pointlessly. The printed circuit boards are interconnected. They are not
designed for disconnection by the user. Avoid touching the printed circuit boards.
They are made with complementary metal-oxide semiconductors (CMOS) and the
static electricity discharged by the human body has an adverse effect on them.

2. HANDLING ELECTRONIC EQUIPMENT

The usual movements of a person easily generate electrostatic energy which may
reach several thousand volts. The discharging of this voltage into devices comprising
semiconductors, when handling electronic circuits, can cause severe deterioration.
Such damage is not necessarily visible immediately. Nevertheless, it reduces the
reliability of the circuit.
Electronic circuits are completely protected against any electrostatic discharge when
inside their housing. Do not expose them to any risk by needlessly taking the
modules out of their housings.
Each module has the best possible protection for its devices consisting of
semiconductors. However, should it be necessary to withdraw the module from its
housing, please take the following precautions to preserve the great reliability and
long service life for which the equipment was designed and manufactured.
1. Before taking the module out of its housing, touch the housing to balance your
electrostatic potential.
2. When handling the module, hold it by its front plate, or by its frame or by the
edges of the printed circuit board. Do not touch the electronic components, the
printed circuit conductors and the connectors.
3. Before passing the module to another person, shake hands with him or her for
example to balance your electrostatic potential.
4. Place the module on an antistatic surface or an electrically conductive surface
with the same potential as yourself.
5. To store or transport the module, place it in conductive packaging.
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If you carry out any measurements on the internal electronic circuits of a device in
service, earth yourself to exposed conductive parts by linking yourself to the housing
by a conductive strap attached to your wrist. The resistance to earth of the conductive
strap which you attach to your wrist and to the housing must be between 500 kΩ and
10 MΩ. If you do not have a device of this type, you must remain permanently in
contact with the housing to prevent any static energy accumulating. The instruments
used to take the measurements must be earthed to the housing insofar as this is
possible.
For further information on the procedures for safe working with all the electronic
equipment, please consult standards BS5783 and IEC 147-OF. In a special handling
area we strongly advise you to undertake a detailed analysis of the electronic circuits
and working conditions according to the BS and IEC standards mentioned above.

3. INSTALLING THE RELAYS

The relays are supplied either individually or mounted in a cubicle. If separate relays
have to be installed according to a particular drawing, please follow the mounting
details indicated in publication R7012. If a MMLG test unit has to be incorporated,
position it to the right of the set of relays (looking at them from the front). The
modules must still be protected in their metal housings during installation on a
cubicle. The design of the relays makes it possible to reach the mounting holes easily
without taking off the cover. For individually mounted relays, a positioning diagram
is normally supplied to indicate the centre of the holes and the layout of the cubicle.
The corresponding dimensions are also indicated in publication N 1509.

4. UNPACKING
When unpacking and installing relays, take great care to avoid damaging the parts
and changing the settings. Relays must be handled only by people who are experts
in this field. As far as possible, the installation must remain clean, dry, free from dust
and free from excessive vibration. The site must be well lit to facilitate inspection.
Relays removed from their housings must not be exposed to dust or humidity. To this
end, it is necessary to take great care when installing relays whilst construction work is
taking place on the same site.

5. STORAGE
If the relays do not have to be installed immediately on reception, they must be stored
protected against dust and humidity in their original carton. If dehumidifying crystals
are placed in the relay packaging, it is advisable not to remove them. The effect of
the dehumidifying crystals is reduced if the packaging is exposed to ambient
conditions. To restore their original effectiveness, you need only to heat the crystals
slightly for around an hour, before replacing them in their delivery carton.
As soon as the packaging is opened, the dust which has accumulated on the carton
risks settling on the relays. In the presence of moisture, the carton and the packaging
can become humidified to the point where the effectiveness of the dehumidifying
crystals is reduced.
The temperature for storage should remain between - 25 °C and + 70 °C.
Technical Guide TG 1.1552
Handling and Safety CHAPTER 8-1
MiCOM P225 Page 5/8

6. SAFETY INSTRUCTIONS

FOR YOUR SAFETY, PLEASE READ THESE INSTRUCTIONS BEFORE DOING ANY
WORK ON THE MiCOM P225 RELAY.
Health and safety
The safety instructions described in this document are intended to guarantee correct
installation and use of the MiCOM P225 relay and to avoid any damage. All persons
directly or indirectly concerned with the use of these devices must be familiar with
these safety instructions.
The meaning of the symbols
The meaning of the symbols which may be used on the equipment or in the product
documentation is as indicated below:

!
Important : refer to the product Important : risk of electrocution
documentation

Protective/safety earth * Functional earth *

Note : this symbol can also be used for a
protective/safety earth on a terminal strip
or in a subassembly, for example for the
electrical power supply.

*NOTE : the term "earth" used in the product documentation is the direct
equivalent of the term "exposed conductive parts" which is also
used.
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7. INSTALLATION, COMMISSIONING AND MAINTENANCE

7.1 Connection of the MiCOM P225 relay
The personnel in charge of the installation, commissioning and maintenance of a
! MiCOM P225 relay must apply adequate procedures to guarantee safety when using
the equipment. Before installation, commissioning or maintenance on the
equipment, consult the relevant chapters in the technical documentation of the relay.
The terminal blocks of the relays may have a dangerously high voltage during
installation, commissioning or maintenance, if electrical isolation is not carried out.
Access to the connectors at the rear of the relays can present risks of electrocution
and thermal shock.
Before you consider energization, the MiCOM P225 relay must be connected to earth
via the terminal provided for this purpose.
Unless otherwise indicated in the technical data chapter of the product
documentation, the minimum size recommended for the earth wire is 2.5 mm2.
Before energising your MiCOM P225 relay, please check the following points:
Rated voltage and polarity of the auxiliary power supply
Current value of the current transformer circuit and integrity of the connections
Integrity of the earth connection.
7.2 Operating conditions of the MiCOM P225 relay
The operation of the MiCOM P225 relay must comply with the electrical and
environmental requirements described in this document.
7.3 Replacement of the batteries
The internal batteries, if used, must be replaced by batteries corresponding to the
! type recommended. They must be installed with the correct polarity, to avoid any risk
of damage to the equipment.
7.4 Current transformer circuits
Never open the auxiliary circuit of a live current transformer. The high voltage
produced may cause serious physical injury and damage the insulation of the
equipment.
7.5 Dielectric withstand test
Following an insulation test, the capacitors may still be charged with a potentially
dangerous voltage. At the end of each part of the test, the voltage must be
progressively brought down to zero to discharge the capacitors before disconnecting
the test wiring.
7.6 Removal and destruction of the MiCOM P225 relay
7.6.1 Removal
The auxiliary power supply circuit of the relay can include capacitors for the power
! supply or for earthing. To avoid any risk of electrocution or thermal shock, it is
appropriate to isolate the relay completely (the two direct current poles) from any
power supply, then to discharge the capacitors in complete safety via the external
terminals, before taking the device out of service.
Technical Guide TG 1.1552
Handling and Safety CHAPTER 8-1
MiCOM P225 Page 7/8

7.6.2 Destruction
It is recommended that the relay should not be incinerated nor thrown into a river.
MiCOM relays and their components should be disposed of and recycled strictly in
compliance with regulations on safety and the environment. Before destruction,
remove the batteries, taking the necessary precautions to avoid any risk of
electrocution.
7.7 Technical specifications

Insulation level: IEC 1010-1: 1990/A2: 1995 This device must be connected to
class I earth to guarantee the safety of the
user.
EN 61010-1: 1993/A2: 1995
class I
Environment: IEC 1010-1: 1990/A2: 1995 Conformity is established by
pollution level 2 reference to the generic safety
standards.
EN 61010-1: 1993/A2: 1995
pollution level 2
Product safety: 73/23/EEC Conformity with the European
Commission directive relating to
low voltages.
EN 61010-1: 1993/A2: 1995 Conformity is established by
reference to the generic safety
EN 60905: 1992/A3: 1995
standards.
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