Transcript Use of SNMP in the Management of Electrical Energy Measuring Systems

Use of SNMP in the Management of Electrical
Energy Measuring Systems
Gustavo Mendes
[email protected]
Introduction
• Problem 1: to manage a complex electrical
energy net;
• Problem 2: to control the net devices;
• Problem 3: imprecision and inefficiency in the
gathering;
• Problem 4: how to manage and control this
net?
Agenda
• SALAMEs architecture
• Management Station functions
• SNMP(Simple Network Management Protocol) in
SALAME system
• A MIB to the measuring systems management
• Final considerations
SALAMEs architecture
• What to manage?
RC
TC
Adapter
Meter
Adapter
MS
RC
Meter
TC
Adapter
...
RC
TC
...
TC
Meter
Adapter
Meter
...
Adapter
MS = Management Station
RC = Regional Concentrator
TC = Transformer Concentrator
Meter
Modules
• Management Station[MS]: control and
manage devices;
• Regional Concentrator[RC]: Data
gathering;
• Transformer Concentrator[TC]: monitor
a set of meters;
Modules
• Adapter: gateway between CT and
meter;
• Meter: conventional meter;
Modules - Communication
EG
CR
CT
SNMP
MODBUS
TCP/IP
Adapter-Meter
PLC – Power Line Carrier
Management Station Functions
• Access Control;
• Communication error management;
• Remote control of the devices;
• Polling of the devices
Management Station Functions
• Management of execution logs;
• Network devices control;
• Reports to the clients;
SNMP in SALAME system
• 4 components in Network management
systems:
1.
2.
3.
4.
Manageable elements;
Management Station;
Management protocol;
Management informations;
SNMP in SALAME system
• Elements of SNMP:
• Management stations;
• Agents;
Send of trap
NMS
Request made to agent
Agent
The answer to the request
Communication flow
SNMP in SALAME system
• Communication between TCP/IP and
SNMP;
SNMP in SALAME system
• Structure
• Managed objects are disposed
hierarchically in a tree;
• Each subtree has an specific OID ( Object
Identifier ) that is unique;
• As example, OID .1.3.6.1.4.1.12214 in
SALAME system is the same of
.iso.org.dod.internet.private.enterprises.
ufcg
SNMP in SALAME system
• Structure of the objects in Salame system:
SNMP in SALAME system
• SNMP supports 2 kinds of operations:
1. Get;
2. Set;
Consumption of the Meter
x.x.x.x.x.x
Management
Station
Agent(RC)
Meter
x.x.x.x.x
The agent answer with the
consumption of the meter
Consumption requisition - GET
SNMP in SALAME system
• Changing the adminStatus(off -> on):
Set operation to change the
adminStatus
Management
Station
Agent(RC)
Meter
x.x.x.x.x
Answer about the update
of the adminStatus
Changing adminStatus - SET
SNMP in SALAME system
• SNMP allows not only to know if the device is
working, but if it´s working well!
• SNMP manages physical devices (routers,
meters) and softwares(SGBDs and Web
Servers)
A MIB to the measuring systems
management
• Variables for:
• Evaluation (ANEEL): DIC, MDIC, FIC;
• Management : PhysAddr, HardVersion,
SoftVersion, DateAndTime, AdminStatus, OperStatus,
ContAbert, CommErr, Temperature;
• Consumption: active energy, medium and
maximum demand, inductive reactive
energy and capacitive reactive energy;
Final considerations
• SALAME objectives to reduce the
information access time to the
companies and the energy consumers;
• SNMP simplifies this approach;
• The network management becomes a
less expensive process;
References
• [1] – Lopes, Raquel V., Sauvé, Jacques
P., Nicolleti, Pedro S. Melhores práticas
para Gerência de Redes de
Computadores. Campus, 2003
• [2] – Mauro, Douglas R., Schmidt, Kevin
J. Essential SNMP. O´REILLY, 2001