remote fault indicator mvlv substation spec

Document Sample
remote fault indicator mvlv substation spec Powered By Docstoc
					Specification for Tender                                                  580a56af-90f2-4197-9aa2-d1444f5be913.doc




                           General Specification for Remote fault
                           passage indicator for Underground
                           Medium Voltage Network

                           Those requirements defines :
                                  - General purpose
                                  - fault passage indicator description
                                  - Measurements
                                  - Event time-stamping
                                  - Scada communication




Last update : 2012-06-25                                                                                  -1-
Specification for Tender                                         580a56af-90f2-4197-9aa2-d1444f5be913.doc




Table of contents:
1. Scope …………………………………………………………………………………….........                                         p. 3
2. Communicating Fault Passage indicators…………………………………………………..                             p. 3
2.1 General information……………………………………………………….............................                  p. 3
2.2 Operational specifications………………………………………………………....................                    p. 3 - 6
2.3 Electrical specifications…………………………………………………………...................                     p. 6
2.4 Construction specifications………………………………………………..............................            p. 6 - 7
2.5 Environment………………………………………………………….....................................                 p. 7
2.6 Documentation ……………………………………………………………............................                      p. 7
3. Fault Monitoring software………………………………………………….....…………….                                 p. 7
3.1 Required hardware architecture……………………………………………............................            p. 7
3.2 Information managed………………………………………………………….......................                       p. 7
3.3 Communication functions……………………………………………………........................                    p. 8
3.4 Man-Machine interface……………………………………………………............................                  p. 8
3.5 System configuration functions …………………………………………………………….....                            p. 9




Last update : 2012-06-25                                                                          -2-
Specification for Tender                                                         580a56af-90f2-4197-9aa2-d1444f5be913.doc




1. Scope
This specification applies to a system allowing to remotely monitor appearance of faults on an
Underground Medium Voltage network so that to localise faulty sections and send patrols for
reconfiguration of the network accordingly.
The system shall be made of:
1.1 Communicating fault passage indicators to be installed used on Medium Voltage electric
networks, in MV/LV substations.
1.2 A piece of software to be installed on a PC in the control centre so that to display the information
from these communicating fault passage indicators. This shall be referred to as a Fault Monitoring
software.


2. Communicating Fault Passage indicators
2.1 General information

2.1.1 Purpose of equipment
The main functions of the equipment are:
2.1.1.1 To detect phase-to-phase and phase-to-earth fault currents on the MV network.
2.1.1.2 To detect voltage dips and interruptions.
2.1.1.3 To time stamp faults and Voltage dips and store them in memory.
2.1.1.4 To transmit information to the control centre spontaneously via the chosen transmission
protocol and medium.
2.1.1.5 To indicate locally the passage of fault currents.
2.1.1.6 To measure electrical quantities with current sensors used for detection of fault currents and
the supply voltage.
2.1.1.7 To provide operators with all useful information for fault finding and preventive maintenance.
2.1.1.8 To be self-supplied during outages thanks to a backup power supply.

2.1.2 Installation
2.1.2.1 The equipment shall be wall-mounted. All the functions necessary for operation with
embedded GSM communication system shall be included in an enclosure of maximum dimensions
250 x 160 x 100 mm.
2.1.2.2 The equipment consists of:
- Split core CTs.
- A detection unit with transmission equipment or RS232 interface.
- An outdoor lamp fitted on the outside of the substation.

2.2 Operational specifications

2.2.1General
The communicating fault current detector shall include:
2.2.1.1 A 220 Vac power supply
2.2.1.2 A charger and backup battery
2.2.1.3 A fault current detection and voltage supervision unit
2.2.1.4 A unit for measuring currents, voltage, power, power factor and energy
2.2.1.5 6 free digital inputs for remote monitoring of the substation
2.2.1.6 2 relay outputs allowing to control substation miscellaneous devices
2.2.1.7 A communication unit performing the functions of
Last update : 2012-06-25
                                                                                                       -3-
Specification for Tender                                                        580a56af-90f2-4197-9aa2-d1444f5be913.doc




- event storage and dating;
- communication with the control centre.
2.2.1.8 A transmission interface:
- GSM or RS232 with Hayes command management.
2.2.1.9 A configuration port for configuring the equipment from a PC.

2.2.2 Functional specifications
2.2.2.1 Fault detection
Detection of the passage of a fault current over the MV network is important information for network
control and reconfiguration. The detection of a fault current must be reliable so as to avoid any errors
of diagnosis. The system shall also record transient phase-to-earth faults useful for network
maintenance.

The equipment shall be delivered with CTs for current sensing. 3 CTs arrangements shall be
available:
- 3 phase CTs to be used when 3 phase MV cables are available, allowing to detect both phase-to-
  earth and phase-to-phase faults.
- 1 zero-sequence CT to be used in substations with 3-core MV cables and allowing detection of
  phase-to-earth faults only.
- 2 phase CTs + 1 zero-sequence CT when 3 phase MV cables are available allowing to detect both
  phase-to-earth faults of low value and phase-to-phase faults.

The following fault detection functions are required:
- Inrush current restraint at line power up (configurable Yes/No)
- Detection of permanent phase-to-phase faults (according to CTs installed)
- Detection of permanent phase-to-earth faults
- Detection of transient phase-to-phase and phase-to-earth faults
- Local indication
- Time-stamped fault recording

Characteristics:
- Phase-to-phase faults threshold: configurable for 40 A to 750 A by 1 A steps.
- Phase-to-earth faults threshold:
        - Without zero-sequence CT: configurable from 5 A to 160 A by 1 A steps
        - With zero-sequence CT: configurable from 2 A to 160 A by 1 A steps
- Fault current duration: configurable for 40 ms to 800 ms by 20 ms steps.

Fault indication reset:
- Remotely from the control centre
- By supply voltage return: configurable Yes/No
- By time-delay configurable for 1 to 12 hours by 1 hour steps

Fault indication:
Detection of a fault current shall be indicated:
- locally by LED on the front panel of the enclosure;
- locally on the outside of the substation by external light indicator;
- remotely at the control centre.


Last update : 2012-06-25
                                                                                                      -4-
Specification for Tender                                                         580a56af-90f2-4197-9aa2-d1444f5be913.doc




2.2.2.2 Detection of voltage drops and absence
From its 220 Vac power supply, the equipment shall provide:
- An image of the MV voltage though voltage scaling;
- Detection of voltage losses: voltage loss threshold configurable from 20% to 80% of Un by 1%
  steps;
- Detection of voltage presence: voltage presence threshold configurable for 60% to 120% of Un;

- Time-stamped log of voltage losses and return;
- Alarms to the control centre for each voltage loss or return (configurable).

2.2.2.3 Digital inputs/outputs
The equipment allow connection of information from sensors available in the substation to potential-
free inputs and controlling of external components from outputs contacts:
Capacity:
- 6 potential-free inputs (dry loop)
- 2 relay outputs

2.2.2.4 Measurements
The equipment shall provide the following measurements from current sensors and voltage sensing:
- Load current on each phase (when using phase CTs)
- Earth fault current
- Average load current on the line (average of the 3 phase currents)
- Medium voltage (configurable scaling of the LV source)
- Power factor
- Frequency
- Three-phase active, reactive and apparent power values
 - Active energy. It shall be possible to calibrate the energy counter.

The measurements shall be available locally by connecting a PC, and remotely from the control
centre.
The accuracy of the measurement digital processing chain shall be at least (excluding sensors):
- 0.5% for current and voltage measurements
- 1% for power and energy values

2.2.2.5 Event time-stamping
Any change of state of information shall generate a time-stamped event stored in memory.
The event storage capacity for transmission to the control centre shall be at least 100 events.

2.2.2.6 Communication with the control centre
The protocol for communication with the supervision system shall be Modbus with an alarm
management feature sot that to allow the equipment to initiate communication to the control centre in
case of alarm.
Each monitored information (fault currents, voltage absence/presence, digital inputs etc…) shall be
configurable as "alarming" when changing state, individually and independently of others. Whenever
a monitored information declared as alarming changes status, the equipment shall make a call to the
control centre.
When using GSM communication, each such change of state might generate and alarm to the control
cntre of an SMS message to a mobile phone, or both, according to configuration.


Last update : 2012-06-25
                                                                                                       -5-
Specification for Tender                                                           580a56af-90f2-4197-9aa2-d1444f5be913.doc




2.2.2.7 Transmission network
The fault current detection and remote supervision equipment shall include a GSM/GPRS modem,
dual-band 900 MHz – 1800 MHz with antenna.
Optionally, a version with RS232 serial link interface shall also be available.

2.2.2.8 Configuration and maintenance
Equipment configuration and diagnostic shall be performed by connection of a PC.
Configuration shall include:
- Configuration of fault detection thresholds and other characteristics.
- Configuration of communication: Telephone numbers (control centre and mobile for sending SMS
  messages), PIN code, transmission speed, etc…
- Configuration of alarms

Diagnostic shall include at least display of the current value of all information monitored (digital
inputs, measurements….) and an embedded Modbus analyser showing Modbus frames received and
sent.

2.3 Electrical specifications

2.3.1 Power supply
The equipment supply voltage shall be 220 Vac +/- 20% 50 Hz.

2.3.2 Current transformers
The current transformers shall be dedicated to the detection equipment and the specifications shall be
defined by the manufacturer to comply with the performance of the equipment as a whole.
Current transformers of the split core type with self-locking attachment system shall be sized for
single-core MV cables up to 45 mm or 3-core MV cables up to 13mm. Transformation ratio shall be
2200/1 A.

2.4 Construction specifications

2.4.1 Overview
The equipment shall be presented in an independent enclosure, of the indoor type. The protection
level shall be IP21 IK07.

2.4.2 Outdoor lamp
The outdoor light indicator shall be located outside the MV/LV substation and shall be visible at 20
metres at least. The minimum power is 4 Cd. It shall be supplied from the enclosure supply.

2.4.3 Environmental specifications
2.4.3.1 Mechanical resistance to vibration and shocks
- The equipment shall have vibration resistance in accordance with
- IEC 60068.2.6: 10-500 Hz 1g or ± 0.075 mm peak to peak.
- IEC 60068.2.27: 10 g / 11 ms / 3 shocks per direction, in the three directions
2.4.3.2 Dielectric withstand
- IEC 61010 Insulation (50 Hz/1 min.): 2 kV
- EN 60-950 Impulse wave (1.2/50 µs): 5 kV
2.4.3.3 Electromagnetic compatibility
- Electrostatic discharge IEC 1000-4-2 Level 3
Last update : 2012-06-25
                                                                                                         -6-
Specification for Tender                                                       580a56af-90f2-4197-9aa2-d1444f5be913.doc
- Radiated fields IEC 1000-4-3 Level 3
- Fast transients IEC 1000-4-4 Level 4
- Impulse waves IEC 1000-4-5 Level 3


- Radio frequency IEC 1000-4-6 Level 3
- Magnetic immunity, 50 Hz, IEC 1000-4-8 Level 4
- Voltage interruption IEC 1000-4-11
- Damped oscillatory waves IEC 1000-4-12 2.5 kV common mode, 1 kV differential mode
- Impulse waves IEC 1000-4-5 Between line wires 1kV, between wire and earth 2 kV
- Emissions EN 55011 Class A

2.5 Environment
Operating temperature: -20°C to +55°C
Storage temperature: -40°C to +85°C
Humidity: 95% at 40°C

2.6 Documentation
Each device shall be supplied with a user manual for installation and commissioning on site.



3. Fault Monitoring software
3.1 Required hardware architecture

The remote Fault monitoring software shall consist in a single operator station which shall support all
of the following functions: Operator station, communication with the Communicating Fault Passage
Indicators and configuration.

The system should run on standard and recent PCs available on the market, running under Windows
XP operating system.

The system will be provided on a CD-ROM. Its installation should be easy and user-friendly using a
set-up software. Installation will take place on a PC, not provided, having at least the following
characteristics:
- Pentium 4 CPU compatible with the application, hard disk at least 80 Mo, memory at 256 Mo,
PSTN modem, at least 1 USB port, 1 RS232 port and 1 parallel port.

3.2 Information managed

The system should manage all the information handled by the Communicating Fault Passage
Indicators:
3.2.1 Inputs
- Fault Passage indicators indications: Phase-to-phase and phase-to-earth fault
- Current measurement
- Complementary digital inputs available on the Communicating Fault Passage Indicators
- Voltage absence/presence
- Battery fault
3.2.2 Outputs
- Fault Passage indicators reset
- Complementary digital outputs available on the Communicating Fault Passage Indicators
Last update : 2012-06-25
                                                                                                     -7-
Specification for Tender                                                        580a56af-90f2-4197-9aa2-d1444f5be913.doc


Despite these control functions (outputs), the system is primarily intended for monitoring of he faults
on the MV network and is therefore named “Fault Monitoring Software” in the next paragraphs.



3.3 Communication functions

The communication shall be supported on the same PC, using:
- Modbus protocol compatible with the Communicating Fault Passage Indicators
- PSTN modem of the PC

The Fault monitoring sofware shall not be permanently connected to any Communicating Fault
Passage Indicators Communication shall be initiated:
- By the Fault monitoring sofware:
        - automatically on configured periodic call,
        - on operator general control request,
        - on operator request for one specific Communicating Fault Passage Indicator,
        - automatically when sending a control: resetting a fault detector and changing status of a
digital output.
- By a communicating Fault Passage Indicator: The communicating Fault Passage Indicator calls the
control center on predefined alarms, according to user configuration: see §2.

The periodic connection can be configured independently for each communicating Fault Passage
Indicator.

3.4 Man-Machine interface

The Fault monitoring sofware Man-Machine Interface shall be made of at least 2 screens:
- One network global overview screen showing a simplified single line diagram or geographical
representation of the network with all communicating Fault Passage Indicators monitored.
- One detailled view per communicating Fault Passage Indicator showing all information handled by
this communicating Fault Passage Indicator.

3.4.1 Network global view
On this view, the network is shown either geographically or as a single line diagram. The network
map can be added as a back plane.
The network view window includes vertical and horizontal scrolling functions so that it can be bigger
than the screen size.
The network is drawn using animated symbols to represent each substation and lines (non-animated)
for electrical lines and cables as well as other graphical objects.
Each substation is shown with a symbol under which the substation name is displayed.
It is animated as follows:
- Symbol:
  - Fixed colour in normal condition
  - Red blinking or other similar when the fault current indication is active
- Substation name:
  - Clicking on the substation name allows to open the substation detailed view.

3.4.2 Substation detailled view
The substation detailled view shall show all information from the communicating Fault Passage
Indicator installed in this substation as well as control of the communicating Fault Passage Indicator
resetting and output contacts: See §2 for more details about such information.
Last update : 2012-06-25
                                                                                                      -8-
Specification for Tender   580a56af-90f2-4197-9aa2-d1444f5be913.doc




Last update : 2012-06-25
                                                 -9-
Specification for Tender                                                   580a56af-90f2-4197-9aa2-d1444f5be913.doc

3.5 System configuration functions

The system should include simple tools to add new devices in the system. A short (maximum 2 day)
training should allow the user to define new communicating Fault Passage Indicators himself.

It should automatically create the communication exchange tables between the monitoring system
communicating Fault Passage Indicators.




Last update : 2012-06-25
                                                                                                 - 10 -

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:4
posted:6/26/2012
language:English
pages:10