Download 1. Introduction - OPS Schneider Electric

Specification for Tender
769842789
Specifications for the Overhead Switch
control unit
This proposal includes:
Last update: 2017-05-13

Description of the enclosure

Energy workshop

Description of the control functions

Fault current detector

RTU function

The automation

SCADA communication
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Specification for Tender
769842789
Table of contents :
1. Introduction............................................................................................................................. p. 3
2. Overview .................................................................................................................................. p. 3
3. Functions ................................................................................................................................. p. 3
4. Description............................................................................................................................... p. 4
4.1 Enclosure ................................................................................................................................ p. 4
4.2 Power supply .......................................................................................................................... p. 4
4.3 Switch control management ................................................................................................... p. 5
4.4 Measurements and measurement processing .......................................................................... p. 5 - 6
4.5 IACT automation .................................................................................................................... p. 6
4.6 Time-tagged data archiving .................................................................................................... p. 7
4.7 Communication with the remote control centre ..................................................................... p. 7 - 8
4.8 Configuration and remote operating tool ................................................................................ p. 8 - 9
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Specification for Tender
769842789
1. Introduction
This document describes the unit used to control the IAT and IACT overhead switches from the central
remote control system.
2. Overview
The overhead switch monitoring and control unit is designed to be installed on a pole. The fixing system
will allow it to be strapped to any type of pole.
The 316L stainless steel enclosure, which is guaranteed to withstand harsh environments, is fitted with a
padlocking system. Its safety rating is IP55.
It will be designed to operate in harsh environments and will undergo qualification and reliability tests in
accordance with International Standards.
3. Functions
3.1 The main control unit functions required are as follows:
- Uninterruptible power supply for the switch, enclosure and transmission equipment
- Local and remote switch control management
- Phase-to-phase and homopolar fault current detection
- Voltage and current measurement on the MV line
- No-voltage detection
- Calculation of active, reactive and apparent power, energy and cos 
- "Sectionalizer" switch automated opening device
- Communication with the multi-protocol remote control centre
- Chronological time-stamped recording of events and measurements
- Local indication of the following information by means of LEDs:
> Open/closed switch position
> Locked switch status indication
> Fault current detection
> Local/remote operation
> Global fault
> No AC supply
> Battery fault
> 48 V DC motor drive fault
> 12 V DC transmission fault
> Automated ON/OFF control
- Local and remote operation
3.2 As it is difficult to access the switches and their control enclosure, the tenderer will provide secure
access tools for remote operation via the communications networks (PSTN, GSM, GPRS) in order to:
- Configure data (save or restore a configuration or change a parameter)
- Download a software update
- Retrieve archived events
- Retrieve archived measurements.
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Specification for Tender
769842789
4. Description
4.1 Enclosure
The monitoring and control unit is designed to be installed at the bottom of the remote-controlled overhead
MV switch pole.
It can be strapped to a concrete, wood or steel lattice pole by means of flanges and threaded rods.
The control unit will combine all the local IAT remote control and monitoring functions in a compact
modular enclosure.
This unit will consist of the following components as standard:
- 316L stainless steel enclosure (IP 55);
- power supply - charger - battery;
- interface with the MV switchgear;
- fault detector (phase-to-phase and homopolar);
- local electric pushbutton control;
- overvoltage and overcurrent protection.
In addition, this unit will be designed to install and manage the remote transmission equipment.
Given the harsh external environmental conditions (temperature, humidity, vibrations, MV electrical
environment, lightning, etc.) and the very high degree of operating safety required, this control unit will be
subjected to very demanding qualification and reliability tests in accordance with IEC International
Standards.
4.2 Power supply
4.2.1 The enclosure power supply system will be used for the following applications:
- To supply the battery charger, electronic system and 12 V / 48 V converter functions for the switch motor
drive and monitoring system,
- 12 V 38 Ah sealed lead battery,
- Overvoltage protection,
- Supply monitoring system.
4.2.2 Characteristics of the energy workshop
- Supply voltage: 90 to 240 V AC ± 10%
- Max. power consumption: 120 VA
- Motor drive supply: 48 V DC; 15 A for 50 ms and 6 A for 12 s
- Transmission equipment supply: 12 V DC; 7 A without battery use
- Battery life: over 9 hours with 10 opening cycles and one radio communication cycle every 60 seconds
- AC insulation voltage: 10 kV (50 Hz/1 min); 20 kV impulse voltage (1.2/50 s)
- Operating temperature: -25°C / +55°C
4.2.3 The following information will be available locally and sent to the remote control centre:
- AC supply fault
- Enclosure supply fault
- Motor drive supply fault
- Transmission equipment supply fault. The 12 V transmission output will be able to supply a conventional
radio without a battery (7 A) to notify the remote control centre in the event of a battery fault.
- Battery fault (periodic check to be organised). The remote control centre will immediately be notified of
the battery fault.
The tenderer will specify the tests performed.
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Specification for Tender
769842789
4.3 Switch control management
The MV switch opening/closing electrical operating mechanism is tripped from the remote control station
or locally by an operator (pushbutton). The position of the MV switches is indicated on the front panel.
Local and remote operation:
A rotary switch on the front panel is used to select the local / remote operating modes.
4.3.1 Remote control mode:
- data and measurements can be transmitted
- the switches can be controlled from the remote control centre
- the local switch control pushbuttons are locked.
4.3.2 Local mode:
- remote measurements and time-stamped events can be transmitted
- the switches can be opened and closed locally by pressing the corresponding pushbutton
- the opening or closing remote control operated from the remote control centre is locked.
4.4 Measurements and measurement processing
4.4.1 Current measurement
The control unit will capture current measurements from sensors fitted on the switch for the purposes of:
- Fault current flow detection
- Sectionalizer automation
- Storing and transmitting values:
> Load current on each phase
> Mean load current
> Homopolar current
> Fault current.
Accuracy of the digital processing system: 0.5%
4.4.2 Voltage measurement
The voltage measurement is required for:
- Indicating voltage presence/absence
- Indicating absence of MV network voltage: high and low configurable thresholds
- Calculating power and energy
- Storing and transmitting line-to-neutral and line-to-line medium voltages
Accuracy of the digital processing system: 0.5%
4.4.3 Fault current flow detectors
Fault current flow detection on the MV network provides important information for controlling and
reconfiguring the network. Fault current detection must be reliable to prevent diagnosis errors. The system
will also record the transient faults that are useful for network maintenance.
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Specification for Tender
769842789
4.4.3.1 The intended functions are:
- Filtering of fault current detection when the line is powered up
- Detection of steady-state phase-to-phase fault current: fault confirmation by voltage absence
- Detection of steady-state phase-earth fault current: fault confirmation by voltage absence
- Fast detection of transient phase-to-phase and homopolar fault currents
- Local indication
- Fault recording
- Fault current storage.
4.4.3.2 Characteristics:
- Phase-to-phase fault: can be configured from 10 A to 800 A in increments of 1 A.
- Homopolar fault: can be configured from 5 A to 160 A in increments of 1 A.
- Processing time (fault duration): can be configured from 40 ms to 800 ms in increments of 1 ms.
4.4.3.3 Erasing the fault from the memory:
- By remote control
- By restoring the supply voltage: can be set to Yes/No
- By setting a time-out period of 1 to 12 hours in increments of 1 hour
4.4.4 Power and energy measurement
The following measurements can be viewed locally, sent to the remote control centre and archived.
- Active, reactive and apparent power
- Power factor
- Active energy
Accuracy of the digital processing system: 1%
4.5 IACT automation
4.5.1 The automated device increments a fault flow counter. To avoid recording transient faults, only faults
followed by a power failure will be included (see fault detector). When the counter reaches a predefined
value (1 to 4), it sends an opening order if:
- the switch is closed
- the fault has disappeared
- the processing time is correct
- no medium voltage is present.
Automated device operation is notified.
The automated device is reset when the time-out, which starts when the first fault appears, is complete. The
cycle time of the automated device will be set to coincide with the upstream tripping device.
4.5.2 Configuring parameters over a computer connection:
- Number of faults: 1 to 4
- Operating time: 20 s to 4 min in increments of 5 s
- "Valid" or "inhibited" automation.
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Specification for Tender
769842789
4.6 Time-tagged data archiving
All the archived data will be retrieved locally and remotely by means of the configuration and operating
software supplied with the control unit.
The data will also be downloaded locally or remotely to a PC as a .CSV file.
Event and measurement time-stamping will be accurate to one millisecond and the discrimination between
two events will be 10 ms.
4.6.1 Time-stamped event archiving
Any change of information status will generate a stored time-stamped event.
The minimum storage capacity of the events to be transmitted to the remote control centre will be 500
events.
4.6.2 Measurement archiving
Each measurement can be configured to be archived if required. A measurement declared archived can be
stored:
- At regular intervals (the interval can be configured): mean or sampled value.
- When the high and low thresholds are exceeded (the values can be configured)
- On deadband (X% customisable)
- Daily: min. and max. daily values (the storage period can be configured: 24 h, 7 d, 14 d)
The measurement storage conditions (configured individually) can be combined. The minimum storage
capacity will be 20000 measurements.
4.7 Communication with the remote control centre
4.7.1 Communication protocol
The control unit will have a minimum of three communication protocols:
- IEC 870-5-101 master/master or master/slave. The master/master or master/slave IEC protocol can be
selected by means of a simple software configuration.
- IEC 870-5-104 master/master or master/slave
- DNP 3.0 level 3 serial or TCP/IP protocol
- Master/master or master/slave Modbus serial or TCP/IP protocol.
4.7.2 Indication transmission
It will be possible to configure each time-stamped event to correspond to the appearance or disappearance
of an "alarming event". A time-stamped event declared to be "alarming" establishes communication with
the remote control centre.
4.7.3 Measurement transmission
It will be possible to configure each measurement to be transmitted spontaneously to the remote control
centre when:
- The deadband is exceeded: X% variation of the value measured; X% can be configured
- The high or low threshold is exceeded: the threshold can be configured in Amps.
4.7.4 Communication ports
4.7.4.1 The control unit will have at least three communication ports:
- An Ethernet port for interfacing with the IP compatible communication equipment (anticipate the
possibility of IP communication network upgrades)
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Specification for Tender
769842789
The Ethernet port shall enable the configuration of three IP addresses to identify the equipment, so as to be
able to be accessed by several different networks or routers, each having their addressing characteristics
(specific network masks).
- An RS232 port controlling the Hayes commands and direct link
- One or two modem ports: GSM, GPRS, telephone, FSK radio, FFSK, LL or a second RS232 port.
4.7.4.2 Operation of each channel will be defined by configuration. The channels will be used as follows:
- Out of service: when the channel is not used, not present or temporarily out of use (for example, due to a
transmission medium fault).
- Normal: corresponds to the main communication channel.
4.7.4.3 Main : Corresponds to the 1st channel (normal) used during normal / standby operation.
4.7.4.4 Standby: Corresponds to the 2nd channel used during normal / standby operation.
4.7.4.5 Symmetric: corresponds to the 2 channels used during normal / standby operation, without
operating priority on either of the channels. The channel in service remains active so long as
communication is present on that channel. If communication disappears from that channel, changeover to
the other channel takes place provided that communication is present on the other channel.
4.7.4.6 Store & Forward: the messages received on the main channel that are intended for another T200
that cannot be accessed directly from Scada are re-sent over the same channel in order to send to that other
T200 the message intended for him.
4.7.4.7 Test: this link is used to send certain information to other T200s nearby at a fixed carrier frequency
so as to be able to perform maintenance operations (adjustment of antenna position, etc.).
4.7.5 Transmission interface
The modems required for connection to the transmission network are as follows:
- PSTN modem (telephone) 300 to 14400 bits/s (V.32 bis) with 8 kV insulation as a protection against
overvoltages
- Radio modem
> 600/1200 Baud FSK
> 1200/2400 Baud FFSK
- Multipoint private leased line modem: V.23 FSK modulation, 600/1200 Baud, with 8 kV insulation as a
protection against overvoltages
- GSM / GPRS modem
> 900 MHz – 1800 MHz dual band
- Serial link interface
> RS232 interface - 200 to 38400 baud
> RS485 interface - 200 to 38400 baud with 2 kV insulation
4.8 Remote configuration and operating tool
It will be possible to configure this data locally or remotely using the operating and maintenance software
supplied with the equipment.
This software will not require a special licence and can be used and copied freely.
Login and access to the various functions will be protected by user name and password. Several access
levels can be configured.
All the functions listed below can be accessed locally or remotely via the GSM or GPRS telephone
communications network:
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Specification for Tender
769842789
4.8.1 Diagnosis
The diagnosis pages will be used to retrieve station, switch and system data.
- Measurement and status display: This page is used to view in real time the TSS, TSD and TM status for
each switch controlled by T200.
- Archived event retrieval.
- Each status log has its own specific page.
- Users can acknowledge statuses locally.
- Maintenance.
- Information about the unit (name of the unit, date of last backup).
- Information about the software used.
- Protocol analyser. This analyser is used to observe the frames exchanged with the remote control centre to
facilitate maintenance operations.
4.8.2 Data loading
- Loading a configuration from a file saved on a PC.
- Loading a new version of the communication card or protocol software with protected switching and the
possibility of reverting to the original version.
4.8.3 Saving parameters and archived data:
- Drive d configuration.
- Events and measurements archived as a Word or Excel file.
4.8.4 Parameter and alarm configuration
- Control module parameters
- Substation name
- Delayed no-voltage alarm
- Fault detector parameters
- Automation parameters
- Communication module parameter
- General parameters (type of protocol, use of ports, type of modem, etc.).
- Protocol parameters: interoperability table, alarm
- Communication parameters
- Optional port parameters
- Equipment time change
- Access rights
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