Areva MiCOM P921 Quick start guide

MiCOM
P921/P922/P923
Voltage and Frequency Relays
Technical guide
P92x/EN T/E11

Technical Guide P92x/EN T00/E11
Content
MiCOM P921-P922-P923 Page 1/2
VOLTAGE AND FREQUENCY RELAYS
MiCOM P921-P922-P923
CONTENT
Safety Section Px2xxEN SSA11
Getting Started P92x/EN GS/E11
Connection diagrams P92x/EN CO/E11
Technical Data P92x/EN TD/E11
User Guide P92x/EN FT/E11
Communications P92x/EN CT/E11
Installation Guide P92x/EN IN/E11
Commissioning Guide P92x/EN CM/E11
Test Report P92x/EN RS/E11

P92x/EN T00/E11 Technical Guide
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Technical Guide Px2xx/EN SS/A11
SAFETY SECTION
SAFETY SECTION

Technical Guide Px2xx/EN SS/A11
SAFETY SECTION
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CONTENT
1. SAFETY INSTRUCTIONS 3
2. INSTALLATION, COMMISSIONING AND MAINTENANCE 4
3. OPERATING CONDITIONS OF THE MiCOM RELAY 4
3.1 Replacement of the batteries 4
3.2 Current transformer circuits 4
3.3 Dielectric withstand test 4
4. REMOVAL AND DESTRUCTION OF THE MiCOM RELAY 5
5. TECHNICAL SPECIFICATIONS 5

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1. SAFETY INSTRUCTIONS
For your safety, please read these instructions before doing any work on the
MiCOM relay.
Health and safety
The safety instructions described in this document are intended to guarantee correct
installation and use of the MiCOM 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: Important:
refer to the product documentation risk of electrocution
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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2. INSTALLATION, COMMISSIONING AND MAINTENANCE
Connection of the MiCOM relay
The personnel in charge of the installation, commissioning and maintenance of a
MiCOM 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 energisation, the MiCOM 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 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.
3. OPERATING CONDITIONS OF THE MiCOM RELAY
The operation of the MiCOM relay must comply with the electrical and environmental
requirements described in this document.
3.1 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.
3.2 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.
3.3 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.
!
!
!
!

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

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Technical Guide P92x/EN GS/E11
MiCOM P921-P922-P923
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Getting Started

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Getting Started
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CONTENT
1. GENERAL CONSIDERATIONS 3
1.1 Receipt of relays 3
1.2 Electrostatic discharge (ESD) 3
2. HANDLING OF ELECTRONIC EQUIPMENT 3
3. RELAY MOUNTING 4
4. UNPACKING 4
5. STORAGE 4
6. INTRODUCTION TO THE MiCOM P921-P922-P923 RELAYS 5
7. RELAY FRONT DESCRIPTION 6
7.1 Front view 6
8. RELAY REAR DESCRIPTION 8
9. PRODUCT IDENTIFICATION 9
10. ENERGISING THE RELAY 10
10.1 System connections 10
10.2 Power supply connections 10
11. ACCESS TO THE MENU 11
11.1 Password protection 11
11.1.1 Password entry 11
11.2 System Frequency 11
11.3 VT Ratios 12
11.4 Connection mode 12
12. QUICK MEASUREMENT CHECK 13
12.1 Voltage 13
13. PC CONNECTION – LOCAL COMMUNICATIONS 14
13.1 Configuration of the connection 14
13.2 Configuration of the relay and of the laptop 14
14. CONNECTION DIAGRAMS 15
15. COMPANY CONTACT INFORMATION 16

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1. GENERAL CONSIDERATIONS
1.1 Receipt of relays
Protective relays, although generally of robust construction, require careful treatment
prior to installation on site. Upon receipt, relays should be examined immediately to
ensure no damage has been sustained in transit. If damage has been sustained
duringtransita claim shouldbe made to the transportcontractor andAREVA
should be promptly notified.
Relays that are supplied unmounted and not intended for immediate installation
should be returned to their protective polythene bags.
1.2 Electrostatic discharge (ESD)
The relays use components that are sensitive to electrostatic discharges.
The electronic circuits are well protected by the metal case and the internal module
should not be withdrawn unnecessarily. When handling the module outside its case,
care should be taken to avoid contact with components and electrical connections. If
removed from the case for storage, the module should be placed in an electrically
conducting antistatic bag.
There are no setting adjustments within the module and it is advised that it is not
unnecessarily disassembled. Although the printed circuit boards are plugged
together, the connectors are a manufacturing aid and not intended for frequent
dismantling; in fact considerable effort may be required to separate them. Touching
the printed circuit board should be avoided, since complementary metal oxide
semiconductors (CMOS) are used, which can be damaged by static electricity
discharged from the body.
2. HANDLING OF ELECTRONIC EQUIPMENT
A person’s normal movements can easily generate electrostatic potentials of several
thousand volts. Discharge of these voltages into semiconductor devices when
handling electronic circuits can cause serious damage, which often may not be
immediately apparent but the reliability of the circuit will have been reduced.
The electronic circuits are completely safe from electrostatic discharge when housed
in the case. Do not expose them to risk of damage by withdrawing modules
unnecessarily.
Each module incorporates the highest practicable protection for its semiconductor
devices. However, if it becomes necessary to withdraw a module, the following
precautions should be taken to preserve the high reliability and long life for which the
equipment has been designed and manufactured.
1. Before removing a module, ensure that you are at the same electrostatic
potential as the equipment by touching the case.
2. Handle the module by its front plate, frame or edges of the printed circuit
board. Avoid touching the electronic components, printed circuit track or
connectors.
3. Do not pass the module to another person without first ensuring you are both at
the same electrostatic potential. Shaking hands achieves equipotential.
4. Place the module on an antistatic surface, or on a conducting surface which is
at the same potential as yourself.
5. Store or transport the module in a conductive bag.

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If you are making measurements on the internal electronic circuitry of an equipment
in service, it is preferable that you are earthed to the case with a conductive wrist
strap. Wrist straps should have a resistance to ground between 500kW– 10MW.
If a wrist strap is not available you should maintain regular contact with the case to
prevent a build-up of static. Instrumentation which may be used for making
measurements should be earthed to the case whenever possible.
More information on safe working procedures for all electronic equipment can be
found in BS5783 and IEC 147-OF. It is strongly recommended that detailed
investigations on electronic circuitry or modification work should be carried out in a
special handling area such as described in the above-mentioned BS and IEC
documents.
3. RELAY MOUNTING
Relays are dispatched either individually or as part of a panel/rack assembly.
If an MMLG test block is to be included it should be positioned at the right-hand side
of the assembly (viewed from the front). Modules should remain protected by their
metal case during assembly into a panel or rack.
For individually mounted relays an outline diagram is supplied in chapter 2 of this
Technical Guide showing the panel cut-outs and hole centres.
4. UNPACKING
Care must be taken when unpacking and installing the relays so that none of the
parts is damaged or the settings altered. Relays must only be handled by skilled
persons. The installation should be clean, dry and reasonably free from dust and
excessive vibration. The site should be well lit to facilitate inspection. Relays that have
been removed from their cases should not be left in situations where they are
exposed to dust or damp. This particularly applies to installations which are being
carried out at the same time as construction work.
5. STORAGE
If relays are not to be installed immediately upon receipt they should be stored in a
place free from dust and moisture in their original cartons. Where de-humidifier bags
have been included in the packing they should be retained. The action of the de-
humidifier crystals will be impaired if the bag has been exposed to ambient
conditions and may be restored by gently heating the bag for about an hour, prior to
replacing it in the carton.
Dust which collects on a carton may, on subsequent unpacking, find its way into the
relay; in damp conditions the carton and packing may become impregnated with
moisture and the de-humifier will lose its efficiency.
Storage temperature : –25°C to +70°C.

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6. INTRODUCTION TO THE MiCOM P921-P922-P923 RELAYS
The range of MiCOM protection relays follows on from the success of the MIDOS, K
and MODN ranges by incorporating the last changes in digital technology. The relays
MiCOM P921-P92 and P923 are fully compatible and use the same modular box
concept. The MiCOM P921-P92 and P923 of relays provides more protection for
the most demanding applications.
Each relay has a large number of functions for controlling and collecting data. This
can form part of a fully integrated system covering protection, control,
instrumentation, data acquisition and the recording of faults, events and
disturbances. The relays are equipped on the front panel with a liquid crystal display
(LCD) with 2 x 16 back-lit alphanumerical characters, a tactile 7 button keypad (to
gain access to all the parameters, alarms and measurements) and 8 LEDs simply
displaying the state of the MiCOM P921-P922 and P923 relays. In addition, the use
of the RS485 communication port makes it possible to read, reinitialise and change
the settings of the relays, if required, from a local or remote PC computer equipped
with appropriate software.
Its flexibility of use, reduced maintenance requirements and ease of integration allow
the MiCOM P921-P922 and P923 to provide an evolving solution for the problems of
the protection of electric networks.
The MiCOM P921-P922 and P923 relays provide comprehensive voltage and
frequency protection for phase and ground faults together with measurements,
control and recording facilities.
Functions MiCOM P921 MiCOM P922 MiCOM P923
Protection functions
Under voltage (27) XXX
Over voltage (59) XXX
Residual over voltage (59N) XXX
Negative sequence overvoltage (47) XX
Positive sequence undervoltage (27D) XX
Under frequency (81U) XX
Over frequency (81O) XX
Rate of change of frequency (81R) X
Undervoltage blocking (settable for P923) XX
Ancillary functions
Settings groups 122
Measurements XXX
Circuit Breaker Control XXX
Circuit Breaker Supervision XX
Output relay latching XXX
Blocking logic XXX
Programmable logic equations XXX
Peak demand XX
Rolling demand XX
Fault record XX
Events records XX
Disturbance recording XX
Rear communication port XXX
Front communication port XXX
Frequency disturbance recording X

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7. RELAY FRONT DESCRIPTION
7.1 Front view
The front panel of the relay is shown in figure 1, with the hinged covers at the top
and bottom of the relay shown closed. Extra physical protection for the front panel
can be provided by an optional transparent front cover. This allows read access only
to the relay’s settings and data but does not affect the relay’s IP rating. When full
access to the relay keypad is required, for editing the settings, the transparent cover
can be unclipped and removed when the top and bottom covers are open.
Note that the MiCOM P921-P922 and P923 have the same size and the same front
panel.
P0385ENa
FIGURE 1 : RELAY FRONT VIEW
The front panel of the relay includes the following, as indicated in Figure 1:
·a 16-character by 2-line alphanumeric liquid crystal display (LCD).
·a 7-key keypad comprising 4 arrow keys (2, 6, 4, 8, an enter key 5, a clear
key 0, and a read key 1).
·8 LEDs; 4 fixed function LEDs and 4 programmable function LEDs on the left
hand side of the front panel.
·Under the top hinged cover:
-the relay serial number, and the relay’s voltage rating information (see
figure 3 in this chapter).