NULEC Application Guide.

MGM/lm/DiskNo/Jan’00

GUIDE

DOCUMENT CLASSIFICATION: CONTROLLED DISCLOSURE

REFERENCE REV TITLE: APPLICATION DESIGN GUIDE FOR THE DISAGABB4 0 CONTROL CUBICLE OF THE NULEC DATE MAY 2003 N24 INTEGRATED AUTO RECLOSER PAGE 1 OF 18 REVISION DATE: MAY 2006

TESCOD APPROVED COMPILED BY FUNCTIONAL RESP. APPROVED BY AUTHORIZED BY Signed .............................. S Mbanga

Signed ................................... K Brown DT CT Specialist

Signed .............................. P R Groenewald for TESCOD

Signed ............................ M N Bailey DTM for ED(D)

Contents Page

Introduction.................................................................................................................................... 2

1 Normative references................................................................................................................ 2

2 Definitions and abbreviations.................................................................................................... 2

3 N24 Control Cubicle Overview.................................................................................................. 2

3.1 The control and protection module (CAPM)...................................................................... 4 3.2 Operator panel subsystem................................................................................................ 4 3.3 Control cable entry module (CCEM) ................................................................................. 5

4 Choosing the correct control guide ........................................................................................... 5

5 WSOS Communication ............................................................................................................. 7

6 Application Design examples.................................................................................................... 8

Annexes

A Specification.............................................................................................................................. 13

B Replaceable parts and tools ..................................................................................................... 15

SAP numbers for Nulec parts ................................................................................................... 17

C Revision Information ................................................................................................................. 18

DOCUMENT CLASSIFICATION: CONTROLLED DISCLOSSURE APPLICATION DESIGN GUIDE FOR REFERENCE REV THE CONTROL CUBICLE OF THE NULEC DISAGABB4 0 N24 INTEGRATED AUTO RECLOSER PAGE 2 OF 18

Introduction

The Nulec control cubicle is designed for use with the N24 auto-recloser.

This document describes the various possible applications of the Nulec control cubicle. It is intended for use by Design Project and Telecontrol project engineers for the purpose of selecting:

• The correct modules, communications interfaces and application of the CAPM.

1 Normative references

The following documents contain provisions that, through reference in the text, constitute requirements of this guide. At the time of publication, the editions indicated were valid. All standards and specifications are subject to revision, and parties to agreements based on this guide are encouraged to investigate the possibility of applying the most recent editions of the documents listed below. Information on currently valid national and international standards and specifications can be obtained from the Information Centre and Technology Standardization Department at Megawatt Park.

N-Series Technical Manual, Document Part No: N00-343, Revision Level: 18

N Series CAPM4, Manual No: N00-548

2 Definitions and abbreviations

2.1 Definitions

2.1.1 Protocol: A formal set of conventions governing the formatting, control procedures and relative timing of message exchange between two communicating systems.

2.1.2 Modem: MODulator- DeModulator. A device used to convert serial digital data from a transmitting terminal to a signal suitable for transmission over a telephone channel or to convert the transmitted signal to serial digital data for the receiving terminal. 2.1.3 Firmware: A fixed set of software instructions stored permanently in non-volatile memory.

2.2 Abbreviations

2.2.1 OCP: Operator Control Panel

2.2.2 WSOS: Windows Switchgear Operating System 2.2.3 IOEX: Input Output Expander Card 2.2.4 CAPM: Control and Protection Module 2.2.5 CCEM: Control Cable Entry Module 2.2.6 FSK: Frequency Shift Keying 2.2.7 SCADA: Supervisory Control and Data Acquisition 2.2.8 LV: Low Voltage 2.2.9 HV: High Voltage 2.2.10 CT: Current Transformer 2.2.11 CVT: Capacitive Voltage Transformer

3 N24 Control Cubicle Overview

The control cubicle consists of the following modular components that can be independently interchanged if they become faulty:


• A mains compartment that houses the LV mains transformers as well as the circuit breakers for the battery and auxiliary supplies.

• The electronics compartment that houses the Control and Protection Module (CAPM) and the Operator Panel Subsystem (OPS). This compartment is sealed to protect the electronics from airborne pollution.

• A battery compartment that houses two 12-Volt, 6.5 Ah batteries.

• The radio mounting-tray for mounting the communications radio, the modem if required and/or the IOEX card. The tray can be completely detached to allow for workshop fitting of the radio and modem

• The Control Cable Entry Module (CCEM) is located behind a removable panel and provides termination and filtering for the control cable. The incoming control cable connects to P1 of the CCEM, the wiring loom connects to P2 of the CCEM.

• The optional heater is not required for South African conditions.

Figure 1: The Nulec control cubicle layout.

Running up the centre of the equipment panel is a rubber cable duct used to carry the internal wiring. The equipment panel can be removed by disconnecting external connections and unbolting. The equipment panel is arranged so that the most heat sensitive components, the batteries, are located low down close to the air entry. In tropical situations this ensures the batteries stay within a few degrees of ambient at all times thus maximizing their life. Additionally the part which generates the most heat, the mains power supply (where fitted), is located at the top of the cubicle where its heating effect on other parts is minimized.


3.1 The Control and Protection Module (CAPM)

The main module of control electronics is the Control and Protection Module (CAPM). The recloser supported by the card is the module revision 4 known as CAPM4. It is centered around a microprocessor and carries out the following functions:-

• High speed sampling of the line current transformers (CTs), calculation of the RMS phase current and earth spill current.

• High speed sampling of the line capacitive voltage transformers (CVTs), calculation of RMS phase/ground voltages.

• Calculation of apparent, real, and reactive power flows from the above.

• Protection relay functions.

• Auto-Reclose relay functions.

• Monitoring of recloser auxiliary switches.

• Monitoring of recloser gas pressure.

• Charging of the close and trip capacitors.

• Discharging the close and trip capacitors into solenoids to operate the recloser, either automatically or by local or remote operator command.

• Charging of the battery from auxiliary supply, changeover to battery on loss of auxiliary supply and disconnection when the battery is exhausted.

• Driving the Operator Panel Sub-system (OPS).

• Driving the external communications interface to allow monitoring and control from remote computer or operator over a communications link.

• Driving the Windows Switchgear Operating System (WSOS) over an RS232 link. The connector for this link is located on the electronics compartment above the operator control panel.

3.2 Operator Panel Subsystem (OPS)

This is comprised of the electronics compartment cover, and operator control panel with LCD display, a membrane keypad and its controlling microcomputer. The microprocessor Subsystem is a replaceable unit.

A 25 way female D-type connector is located on the electronics compartment cover above the Operator Control Panel. This connects to an RS232 port on the electronic controller for use with the Windows Switchgear Operating System (WSOS) on a portable computer. This port is also used to upgrade electronic controller operating software, including installation of new telemetry protocols.


Figure 2 - The Operator Control Panel

3.3 Control Cable Entry Module (CCEM)

This is located at the bottom of the battery compartment and provides termination and filtering for signals from the recloser. The CCEM is a replaceable unit.

3 Choosing the correct control cubicle modules for a particular application

This sections covers the environmental, functional and design issues that need to be considered when ordering the Nulec Integrated recloser control cubicle.

3.1 Environmental

Although Nulec has three control cubicle options to suite different climatic conditions, only the tropical version is approved for South African conditions.

• The tropical version is well ventilated and is suitable for climates where the ambient temperature can reach 50 °C and only occasionally goes below 0 °C, with a lower limit of –10 °C.

3.2 Communication Interfaces

The Control and Protection Module (CAPM) provides the following communications interfaces:

Two physical interfaces are provided on the CAPM, either interface can be used.

• Port 10 - V23 (FSK modem) interface with (TX, RX, PTT and busy signals) • Port 8 - RS232 interface

A 12V switch-mode power supply is provided to power the radio/modem.

3.2.1 V23 Interface

The built-in FSK modem provides half-duplex V23 signaling at 1200 bps. This interface provides an alternative over over fiber when it is required to interface two integrated reclosers.


The V23 15-pin female connector is connected to P10 via the combined data cable, N03-711, supplied specifically for Eskom.

3.2.2 RS232 Interface

A DB-25 male RS232 interface is available on the CAPM port P8. Through the combined cable, N03-643A (See appendix C), the following standard connectors are available for interfacing to a radio:

• RTM1202 (Interface to RTM1202 FSK modem in Tait 2000 radio) • RFM01 (Interface to RFM01 FFSK modem in Tait 2000 radio)

When the radio is not used the IOEX is mounted on the same tray. The tray folds up with the radio face pointing upward when the cubicle is closed. This tray is secured into that upright position by the use of plastic handle screws that need to be tightened. When opening they are loosened and the radio will be in the position as indicated in the diagram.

Power to the radio is connected to the back and it can be software adjustable using WSOS from 12 V to 15 V for the required. The DB9 connector of the radio is connected directly to RTM1202, thus there is no need for making cables.

3.3 Input Output Expander Card

The optional Input Output Expander (IOEX) card provides optically isolated input contacts and voltage free output contacts to allow connection of an external Remote Terminal Unit (RTU). It is installed in a die cast, sealed enclosure mounted on the radio tray and earthed to an equipment panel mounting bolt.

Figure 3: IOEX Card Mounted on the radio tray cabinet

A mapping held in the CAPM database controls the function of the IOEX. It specifies what database information is “mapped” into the IOEX outputs and which controls are “mapped” into the IOEX inputs.

3.3.1 Connection to the CAPM-4

The IOEX Card is connected to the CAPM-4 by means of the 16-pin header connector, SP1 at the end of the combined data cable, N03-711.

3.3.2 IOEX Status page

The page displays the IOEX inputs and outputs to assist debugging during installation and maintenance.

The fields shown on the IOEX display are categorised into password protected (P) and display only (D).

When the IOEX configuration is invalid or has some other problems such as wrong hardware type, the IOEX driver stops and flashes a warning message at the top of the screen, “ IOEX Configuration Corrupt or Invalid”.


3.3.3 Input and Output Standard Mapping

The IOEX has 12 independent, optically isolated inputs, each with Metal Oxide Varsitor (MOV) protection. DC in either polarity or AC input signals are accepted. Input Voltage range is 60 –130 VAC or 18 – 150 VDC.

The IOEX has 8 independent voltage free relay contact outputs, each with MVO protection. The contacts are rated for 150VAC, 2A or 150VDC, 1A non-inductive.

Note: The IOEX contacts are not guaranteed to change during fast Auto Reclose sequences but will indicate the final steady state condition within 300ms.

3.3.4 Power Consumption of the IOEX card

If an IOEX card is fitted to the control cubicle, the battery hold-up time can be affected. This is due to the current drawn by the IOEX card and its relay coils. An IOEX card draws 10mA without any relays turned on. The relays draw approximately 20mA each for an IOEX Rev 1 and 10mA each for an IOEX Rev 2. There can be up to four relays energised at once with at least one relay energised at all times.

Therefore an IOEX Rev 1 draws a minimum of 30mA and a maximum of 90mA while an IOEX Rev 2 will draw a minimum of 20mA and a maximum of 50mA. Nulec Industries’ battery hold-up time rating is based on a recloser installation without the IOEX card fitted.

4 Windows Switchgear Operating System (WSOS)

WSOS is an alternative interface to the operator panel. This is a software package for a Personal Computer (PC) that allows management, control and monitoring of a population of reclosers. WSOS is purchased as an additional item.

WSOS provides the following facilities for:

• Online and offline management of all protection settings.

• Tripping and Closing of the switchgear and other operator control functions.

• Uploading of historical data (e.g. event record or demand measurements) into the computer, which can be taken away and processed elsewhere.

• Automatic dial-back from the controller to the WSOS PC on change of state.

Embedded in the circuit breaker controller is server software for the WSOS package. The server provides two interfaces for connection to the WSOS. Connection can be made from a PC to the WSOS server at either port but only one port can be used at any one time.

4.1 Using WSOS via the Electronics Compartment Computer Port (P9)

This is a standard RS232 port connection running at 19.2kbps unless otherwise requested. This port provides high speed downloading of settings and uploading of events using WSOS.

4.2 Using WSOS via the telemetry port (P8)

This is a standard RS232 port and provides remote access to a PC running WSOS located elsewhere such as in an office or workshop. To gain remote access a modem must be installed in the control cubicle allowing the PC to control the recloser from another location. Typically the modem is connected to a telephone line or is itself a digital cellular telephone modem.

The modem allows an engineer or operator to dial into the controller and check on the event record or make protection setting changes. In addition the controller can be configured to dial the PC


automatically when events occur such as trip to lockout. This is called Change of State (COS) reporting and allows a WSOS computer to be used as a monitoring system for a population of circuit breakers.

In some software configurations this port is used by other protocols in which case it cannot be used for WSOS connection at the same time.

The port must be configure on (System Status-WSOS Port P8 Communications) and requires:

• The baud rate must be set to match the modem interface to allow dial-in access to WSOS (this is not necessarily the same as the modem signalling speed).

CAPM 4 possible range is 300 baud to 9.6kBaud

CAPM 5 possible range is 300 baud to 19.2kBaud.

• “COS” If Change of State Reporting is required a telephone number is also required.

5 Application Design examples

5.1 MV line Applications

5.1.1 Recloser for MV line applications using DNP (Recommended)

Ensure that the control centre is equipped with FFSK modems for communication using the DNP3 protocol.

Under normal circumstances the CUBICLE, CONTROL N24 NU-LEC PTCC-TRO with SAP no 0187695 is the best option to order. This Control cubicle is divided into four compartments.

• Mains compartment • Electronics compartment • Battery Compartment • CCEM compartment

These compartments are fully loaded with the following equipment modules.

• Operator control panel module • Battery compartment with 2 batteries • Rubber cable Duct • Control Cable Entry Module (CCEM) • Hinged radio mounting tray • Mains compartment for AC supply ( This is for the 220 V AC from the VT) • 25 pin RS232 connector above the operator Panel for WSOS communication • CAPM 4 controller card • IOEX cable, RFM 01 cable and RTM1202 Cables ready for connecting to interfacing equipment. • The Close and Trip capacitors are part of the control cubicle sitting in the Electronics compartment

The power supply design for the radio is centered on the tait radio, so it is advisable to use the tait radio. The radio is ordered separately from EMCOM.

5.1.2 Recloser for MV line applications using EV Protocol (Not Recommended)

The setup is the same as above except that instead of a radio an IOEX card will have to be ordered. Ensure that a PMRTU is available for interfacing the control and input data via the IOEX.

When using a PMRTU always ensure that there is an external power voltage source for the controls. This source should be able to supply a voltage of more than 18 V on the PMRTU outputs as the IOEX inputs are rated 18 -150VDC. The PMRTU outputs by design can take up to 63V DC for their supply.


IST provides the IST PMRTU.

The block diagram below shows the connection between the units.

FIGURE 4: Nulec Control Box connected via IOEX to IST PMRTU

Note: This is not a recommended solution as it is highly costly. The cost of the IOEX card is R4, 271.00, the RTU cost is approximately R20 000. It is highly recommended then to wait until the DNP 3 issues are sorted out and opt for solution 5.1

5.2 Nulec recloser for Substation applications

5.2.1 Using 2 IOEX modules, 2 Nulec reclosers and the DRTU or PMRTU (EV Protocol)

The use of Nulec reclosers in substation applications has been found to be a cheaper alternative to the dogbox breakers. Due to the need to interface to the transformer indications and the master trip control, use of the IOEX cannot be avoided. All the digital input and output information from the Nulec will be mapped to the DRTU Multi I/O card. The DRTUs will be able to communicate to the SMART system using EV.

In order to achieve this setup, there is a need to purchase two separate fully-fledged Nulec units as in section 5.1 with exception of the Radio. Only one radio will be used and that will be part of the DRTU.

Master Trip Indication Control

FIGURE 5: Nulec Control Box connected via IOEX to IST DRTU

IST PMRTU with the Radio

Breaker Nulec Control box

IOEX CARD

HV Breaker

Nulec Control box

IOEX CARD

LV Breaker

Nulec Control box

IOEX CARD

I

DRTU with radio

Transformer


5.2.2 Using 2 Configurable IOEX modules, 2 Nulec reclosers and two radios in the Nulec reclosers (DNP with configurable IOEX).

When using the configurable IOEX modules, alarms/indications from the transformer are mapped directly to the IOEX. Using the configurable database feature provided by version 28, IOEX inputs and outputs can be mapped as both part of the DNP3 database and the Event log.

Advantages

• No IDF work required • More alarms from the Nulec sent through to SCADA providing better fault analysis • Two radios on one site provide better insight into communication problems. Radio Network failures

can be easily picked up. • The chances of availability of at least half the HV/LV transformer alarms is increased.

Disadvantages

Added expense of purchasing an extra radio and antenna Increase in collisions when reporting alarms

FIGURE 6: Nulec Control Box with Configurable IOEX

5.2.2.1 Configurable IOEX operation

Both the non-configurable and configurable IOEX modules have identical hardware. The programmability is determined by the firmware on the Nulec recloser.

The IOEX has 8 programmable output (Indication) points and 12 programmable input (control) points. There is a need for external voltage supply for both the indications and controls, the voltage range is 18 – 130 V DC although measures of up to 11.4 volts were observed during testing.


FIGURE 7: Diagram representing the wiring of the transformer alarms into the IOEX

5.2.3 Using 2 IOEX modules, 2 Nulec reclosers and the Nulec Radio (DNP)

In order to achieve this setup, there is a need to purchase two separate fully-fledged units as in section 5.1 with only one radio in one of the Nulec reclosers. The Nulec with the radio connected will be the “ Master “ of the other Nulec.

Indications from Recloser 1 will be send to Recloser 2, Recloser 2 will also control the breaker on 1 via the IOEX. SEF, ARC, Dummy, Reset Flag. Please refer to diagram 2 for more detail.

FIGURE 8: Nulec


5.3 Using the 600 Ohm interface module

This module interfaces to the FSK modem port. Several Nulec Reclosers can be multi-dropped to one module, which in turn will be connected to a Radio for communicating to the master. This can only be used if the IOEX is not used. The downside of this installation is the use of FSK modems which are no longer used in distribution. This kind of installation can only work with DNP 3 protocol.

The time taken for polling and responding to the master also needs to be adjusted as the daisy chain introduces a delay element.

5.4 Using a DRTU as a master to the Nulec

By means of serial connection the Nulec can be connected to the DRTU. The DRTU will act as the master to the two Nulec reclosers. Direct serial connection is only possible where the distance between the control box and the recloser is between 15 and 20 meters. In cases where there is a longer distance signal amplifiers will be required.

Another option where distance is a problem, fibre to RS232 converters can be used.

Advantages

• Less IDF wiring • Only one radio will be used • Fault finding will be easier • Ease of database mapping on the SMART side as only one address will be used.

Disadvantages

When going the fibre optic route a large cost can be incurred


Annex A

SPECIFICATION

A.1 Control Cubicle

Standard Control Cable Length (Note 1) 7m

Maximum Vertical Separation from circuit breaker with Standard Control Cable 5m

Maintenance Interval (Note 2) 5 Years

Auxiliary Supply Voltage(Low voltage AC mains supply) As ordered +10-20%

Required Auxiliary Supply Rating 50 VA

Battery Capacity 24V 6.5 AH

Battery Hold Up Time from fully charged (Note 3) 5 Days

Battery Recharge Time(new battery to 80 % nominal capacity) 10 Hours

Battery Replacement Interval (note 2) 5 Years

Battery Low Voltage (Note 4) 23V

Battery High Voltage (Note 4) 32V

Earthing (Note 5) 10mm Earth Stud

Heater Power (where fitted) 120 W

NOTES:

1) Other Control Cable lengths available – 4,11 and 20 meters.

2) Battery replacement interval is influenced by location.

3) Assumes no radio/modem power drain or IOEX card connected. At the end of the holdup period, power is available for a minimum of 10 reclose operations. When exhausted the battery is disconnected.

4) Temperature compensated at 48mV/°C.

5) Earthing details must strictly be adhered to.

A.2 Radio/Modem

A radio or modem may be fitted by Nulec Industries or by the utility for remote communications. Space and data interfaces are provided within the control cubicle.

Radio/Modem Power Supply Voltage (set by the user) 5 – 15 VDC

Radio/Modem Power Supply Continuos Current 3A

Radio/Modem Power Supply Max Current 5A for 30 se with 20% duty cycle

Radio/Modem Space on Radio Panel 330 x 215 x 85mm

Radio/Modem Interface V23 or RS232

Radio/Modem Power Shutdown Time 1-1440mins

Timing Accuracy ±10s

A.3 Control Electronics Thermal Constraints Continuos Primary current 800A

Short Time Primary Current 16kA for 3s

Short Time Recovery Time 60s

Recloser Operations 20 in 1 minute, 1 per minute thereafter


A.4 Environmental

Operating Temperature (Note 1) -30 to +50°C

Operating Humidity 0 to 100%

Operating Solar Radiation 1.1kW/m^2 max

Operating Altitude (Note 2) 3000m max


Annex B1

REPLACEABLE PARTS AND TOOLS

All replacement parts are available from Nu-Lec Pty Ltd, some may be available from the part manufacturer or his agent directly.

Listed below are the parts that may be required for replacement following customer maintenance. All the parts that are listed below are only those that are applicable to the telecontrol discipline. In order to get information on protection equipment ordering; please look at your manual pages151 and 152.

Part Supplier/Description Nu-Lec part Number

Antenna Surge Arrestor Nu-Lec ELCMIS0211

Batteries LCR 12V7.5P 12V Battery BAT8250012

Cable Tail Kit : Quantity 6 off 250 Amp, 3m cable fitted with bushing boot and lug

Nu-Lec N01-693

Cable Tail Kit: Quantity 6 off 400 Amp, 3m cable fitted with bushing boot and screw termination.

Nu-Lec N01-612

Cable Tail Kit: Quantity 6 off 400 Amp, 3m cable fitted with bushing boot and screw termination.

Nu-Lec N01-612

Control and Protection Module (CAPM 4 ) Nu-Lec ELCCAPM4

Control Cable 7m long ( Also available in 3.5,4,8,10,11 metre lengths)

Nu-Lec NO3-602

Control Cubicle Door Seal TESATape

DF50604/1224

NEO0910082

Control Cubicle Entry Module (CCEM) Nu-Lec ELCCCEM1

Control Cubicle Nulec

Tropical Version

Moderate Version

Temperature Version

PTCC-TRO

PTCC-MOD

PTCC-TEM

Control Cubicle Heater 240 VAC Nu-Lec (Temperature version)

ELCM1S0140

Control Cubicle Thermostat Nu-Lec (Temperature version)

ELCM1S0142

Control Cubicle Heater 120 VAC Nu-Lec (Temperature version)

ELCM1S0143

Electronics Compartment Cover Gasket Nu-Lec N03-036


Ferrite Filters (ID = 10mm) for incoming cable

Radio Spares MSFC-13T( Only one required)

ELCIND0030

Manual Operation Set Nu-Lec N07-600

Operator Panel Subsystem Backlit Display and Quick Keys

Nu-Lec N03-622

Radio Cable (intermediate) V23 Nu-Lec N03-530

Switchgear Cable Entry Compartment Nu-Lec N01-008

Test and Training Set (TTS) Nu-Lec TTS1-02

Windows Switchgear Operating System (WSOS)

Nu-Lec Refer Agent


Annex B2

SAP NUMBERS FOR NULEC PARTS

Item Short description SAP no. 1 BRK, N24 NU-LEC N24-150S 0187695 2 CUBICLE, CONTROL N24 NU-LEC PTCC-TRO 0187696 3 CIRCUIT BOARD, CAPM4 ELCCAPM4-09-03 0187697 4 CARD, CCEM NU-LEC ELCCCEM1-02-00 0187698 5 MODULE, OCP NU-LEC ELCOCPM4-05-00 0187699 6 CARD, SCEM NU-LEC ELCSCEM4-09-02 0187700 7 SOFTWARE, LOOP AUTOMATION NU-LEC 0187701 8 TEST & TRAINING SET NU-LEC TTS1-02 0187702 9 SIMULATOR, AUTO-RECLOSER NU-LEC 0187703

10 BRACKET, SINGLE POLE NU-LEC 0187704 11 MODULE, IOEX NU-LEC N04-611 0187705 12 CARD, OHM INTERFACE 600 OHM NU-LEC 0187706 13 CABLE, CONTROL 7m NU-LEC N03-602 0187707 14 CABLE, CONTROL 12m NU-LEC N03-603 0187708 15 CABLE, CONTROL 20m NU-LEC N03-605 0187709 16 BOOT, BUSHING NU-LEC INS019F 0187710 17 CABLE TAIL, IUC120 NU-LEC N01-734 0187711 18 CABLE TAIL, IUC240 NU-LEC N01-692 0187712 19 GREASE, SILICONE NU-LEC LUB058044 0187713 20 PANEL, REMOTE NU-LEC RCOP-101 0187715 21 SOFTWARE, AUTO CHANGE-OVER NU-LEC 0187716 22 MODEM, NU-LEC ELCOPT02-01 0187717 23 MODEM, NU-LEC NUL232 0187718 24 WIRE STRIPPER, NU-LEC DUL001 0187719

Table B2 – Spare items for Nu-Lec recloser


Annex C

Revision information

DATE REV. COMPILER NOTES Apr’03 0 S Mbanga Original issue – Doc number

NULEC Application Guide.

Documents

Transcript of NULEC Application Guide.