Use of SNMP in the Management of Electrical Energy Measuring Systems

1
Use of SNMP in the Management of Electrical
Energy Measuring Systems

• Gustavo Mendes gustavo_at_dsc.ufcg.edu.br

2
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?

3
Agenda

• SALAMEs architecture
• Management Station functions
• SNMP(Simple Network Management Protocol) in
  SALAME system
• A MIB to the measuring systems management
• Final considerations

4
SALAMEs architecture

• What to manage?

MS Management Station RC Regional
Concentrator TC Transformer Concentrator
5
Modules

• Management StationMS control and manage
  devices
• Regional ConcentratorRC Data gathering
• Transformer ConcentratorTC monitor a set of
  meters

6
Modules

• Adapter gateway between CT and meter
• Meter conventional meter

7
Modules - Communication
EG
CR
CT
SNMP
MODBUS
TCP/IP
Adapter-Meter
PLC Power Line Carrier
8
Management Station Functions

• Access Control
• Communication error management
• Remote control of the devices
• Polling of the devices

9
Management Station Functions

• Management of execution logs
• Network devices control
• Reports to the clients

10
SNMP in SALAME system

• 4 components in Network management systems
• Manageable elements
• Management Station
• Management protocol
• Management informations

11
SNMP in SALAME system

• Elements of SNMP
• Management stations
• Agents

NMS
Agent
Send of trap
Request made to agent
The answer to the request
Communication flow
12
SNMP in SALAME system

• Communication between TCP/IP and SNMP

13
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.privat
  e.enterprises. ufcg

14
SNMP in SALAME system

• Structure of the objects in Salame system

15
SNMP in SALAME system

• SNMP supports 2 kinds of operations
• Get
• 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
16
SNMP in SALAME system

• Changing the adminStatus(off -gt 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
17
SNMP in SALAME system

• SNMP allows not only to know if the device is
  working, but if its working well!
• SNMP manages physical devices (routers, meters)
  and softwares(SGBDs and Web Servers)

18
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

19
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

20
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. OREILLY, 2001