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ABB Power Distribution 1��

Sectos NXA

SF6 gas insulated pole mounted load-break

switch-disconnector

Technical Brochure

ABB Power Distribution2��

Index

1 Sectos NXA, SF6 gas insulated, pole mounted,

switch-disconnector ....................................................................... 3

2 Use of Sectos NXA switch-disconnector .........................................4

3 Technical data ................................................................................. 53.1 Type code .............................................................................53.2 Standards .............................................................................. 53.3 General technical values ....................................................... 63.4 Electrical performance data ..................................................63.5 Electrical endurance ............................................................. 73.6 Gas pressure temperature variation curve ............................ 73.7 Rating plate IEC ................................................................... 73.8 Rating plate ANSI.................................................................. 7

4 Accessories ..................................................................................... 84.1 Accessories to be installed in the mechanism end box ......... 84.2 Mounting accessories ......................................................... 114.3 Connecting bare conductor ................................................. 134.4 Connecting insulated cable ................................................. 134.5 Operating devices ............................................................... 144.6 Remote control .................................................................... 164.7 Indication of faults ............................................................... 17

5 Dimension drawings ...................................................................... 185.1 Sectos NXA switch-disconnectors ...................................... 185.2 Manual operating device ..................................................... 195.3 Motor operating device........................................................ 195.4 Mounting brackets ............................................................... 205.5 Terminals ............................................................................ 215.6 Crossarm ............................................................................ 22

6 Connection diagrams .................................................................... 236.1 Main circuit diagram of Sectos NXA ................................... 236.2 Auxiliary circuit diagram of the switch equipped with

single spring type actuator .................................................. 236.3 Auxiliary circuit diagram of the switch equipped with

double-spring type actuator................................................. 246.4 Down-lead cable plug.......................................................... 246.5 Connection of current sensors to fault indicator .................. 25

Sectos NXA

SF6-gas insulated, pole mountedload-break switch-disconnector


1 Sectos NXASF6-gas insulated,pole mounted,switch-disconnector

The sturdy load-break switch-dis-connector is located inside a stain-less steel tank, where it is completelyprotected against the effects of envi-ronment.

Inside the tank SF6 gas is used asinsulating and arc extinguishing me-dium. SF6 gas improves the breakingand making characteristics of theswitch, reducing the insulation dis-tances between live parts and theoverall outer dimensions. The gaspressure is 1,5 bar (abs.) at 20 oC,see diagram 3.6 for the pressure/temperature variation.

Inside of the tank there is a gas den-sity indicating contact, which ope-rates, when gas pressure dropsbelow 1,1 bar (abs.) at 20 oC.

The mechanism is of the indepen-dent spring type ensuring the speedof opening and closing to be inde-pendant of the speed of operation.

The Sectos NXA switch-discon-nectors may be manually operatedor motor operated for remote control.

NXA switch-disconnectors are avail-able for rated voltages 24 kV and36 kV to IEC standards (IEC 129,IEC 265-1), and for rated maximumvoltages 27 kV and 38 kV to ANSIstandards.

The contact is wired to outside of thetank via a multi-pin terminal plug,from which the signal can easily betransmitted to a remote control sys-tem.

The bushing insulators are outercone type, series 400 (DIN 47636-ASL-36-400), on the top of whichare usually installed silicon rubberouter insulators, which permit theswitch to be directly connected to anoverhead-line equipped with bareconductors. Alternatively, a cabletermination with series 400 Tee-connector can be used to connect aninsulated cable directly to the outercone bushings.

The position indicator, located inthe operating mechanism end box,shows clearly and unambiguouslythe position of the switch. The indi-cator is rigidly connected to the mainshaft of the switch and fulfils therequirements of the standards IEC129 A2 (1996) and NF C 64-140(1990).

Multi-pin plug-in terminals,including the gas pressurealarm circuit.

Tank is made of stainless steel.

The insulators are made of flexible siliconrubber, which if necessary are detachable.Silicon rubber has excellent electricalproperties, is hydrophobic and unbreakable.

Outer cone bushing, series 400.

Clear, unambiguous, reliable positionindicator, made of light reflectingmaterial, visible from ground leveleven at night in driving rain.

Closed Open

Sectos NXA

SF6-gas insulated, pole mountedload-break switch-disconnector

Ratingplate

Earthingterminal

Gas fillingvalve

The tank fulfils the requirementof "sealed pressure system" ofthe standard IEC 56, whichmeans that during the expectedlifetime of the switch thereshould not be any need toadd gas.


Sectos NXA

Use of Sectos NXA switch-disconnector

2 Use of Sectos NXAswitch-disconnector

The Sectos NXA switch-disconnectors are intended foruse as line switches in medium voltage overhead linenetworks. They are designed for flexibility and are suit-able for application on remote control systems.

The objective is to reach the highest possible reliabilityin many types of difficult environments. Sectos NXAswitch-disconnectors are highly resistant to corrosion,the effects of snow, ice, animals, vegetation andvandalization giving superior performance, when com-pared with conventional air insulated switches.

The construction of Sectos NXA switch-disconnectorsstrives to acheive maximum flexibility, and with variousmounting accessories allows easy installation.Themanual operating device can be upgraded with motoroperating mechanism, or vice versa, if the remote controlconfiguration in the network so demands. All accessoriesneeded for remote control, such as current sensors, faultcurrent indicators, remote control terminals, auxiliarycontacts etc. are designed to be easily retrofitted.

The Sectos NXA switch-disconnector is small, light-weight and can be fitted above or below the crossarm.The operating rod can be cut to any desired lengthallowing the operating device to be installed near thegroung level or higher up in the pole. Both the manualand motor operated units are using similar fixed typeoperating rod, and both can be padlocked in open andclosed position. For further information please referto the point 4.5.

The Sectos NXA switch-disconnector requires a minimalamount of maintenance. Stainless steel tank, hot dipgalvanised fixing accessories, carefully encapsulatedmechanism end box, silicon rubber outer insulatorsand all main electrical parts located inside the SF6-gascompartment together ensure a long and virtuallymaintenance free service life. The only maintenanceoperation would be the verification of the gas pressure,which is recommended once every three years. In auto-mated distribution systems the gas density alarm contactcan be used to give remote low gas alarm.

Installation above the crossarm,motor operating device

Installation below the crossarm,motor operating device

Portal pole, installation below the crossarm,manual operating device


Sectos NXA

Technical data

3. Technical data3.1 Type code

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Pole mounted SF6 insulated switch-disconnector

Construction letter

Rated voltage– 24 kV– 36 kV– 27 kV– 38 kV

Type of insulator– C silicon rubber insulator– E outer cone insulator, series 400, thread M16

Rated current (A)

Spring device– A 1-spring mechanism– B 2-spring mechanism

Version

Code for accessories

3.2 Standards

The Sectos NXA switch-disconnector is designed to IEC standards, but the main electrical values have been testedalso according to ANSI standards.

IEC 129 Alternating current disconnectors and earthing switches

IEC 265-1 High-voltage switches. Part 1: High-voltage switches for rated voltagesabove 1 kV and less than 52 kV

IEC 694 Common clauses for high-voltage switchgear and controlgear standards

ANSI/IEEE C37.63 IEEE Standard requirements for overhead, pad-mounted, dry-vault, andsubmersible automatic line sectionalizers for AC systems

ANSI/IEEE C37.71 Three-phase, manually operated subsurface load-interrupting switches foralternating-current systems

3.3 General technical values

– mechanical endurance more than 5000 close–open operations

– SF6 gas filling pressure (at 20 oC) 1,5 bar (abs.)

– weight 95 kg, complete for installation with silicon rubber insulators

– protection degree of the mechanism end box IP X7

– ambient temperature range –40...+60 oC

– creepage distance of the silicon rubber insulator (type NXAZJ 1) 960 mm


Sectos NXA

Technical data

3.4 Electrical performance data

Standards : IEC NXA 24 NXA 36

Insulation level– rated voltage 24 kV 36 kV– withstand voltage, 50 Hz

– between phases and against earth 50 kV 70 kV– across the isolating distance 60 kV 80 kV

– lightning impulse withstand voltage– between phases and against earth 125 kV 170 kV– across the isolating distance 145 kV 195 kV

Current ratings– rated normal current 630 A 400 A– mainly active load breaking current (400 CO operations) 630 A 400 A– closed loop breaking current 630 A 630 A– line-charging breaking current 50 A 40 A– cable-charging breaking current 50 A 40 A– no-load transformer breaking current 20 A 20 A– capacitor bank breaking current 200 A 175 A– cable or line breaking current under earth fault conditions 87 A 80 A– earth fault breaking current 200 A 175 A

Short circuit ratings– short-time withstand current, Ith 16 kA, 3 s 10 kA, 3 s– peak withstand current, Idyn 40 kA 25 kA– short-circuit making current, peak value 40 kA 25kA

Standard: ANSI NXA 27 NXA 38

Insulation level– nominal voltage class 25 kV 34,5 kV– rated maximum voltage 27 kV 38 kV– rated continuous current 600 A 600 A– rated impulse withstand voltage 150 kV 150 kV

Industrial frequency withstand voltage test– 1 min, dry 60 kV 70 kV– 10 s, wet 50 kV 60 kV– DC, 15 min, withstand 78 kV 103 kV

Partial discharge measurements– extinction voltage 19 kV 26 kV– radio interference voltage 16,4 kV 23 kV

Breaking tests– rated continuous and load-interrupting current 600 A 600 A– symmetrical interrupting current 1320 A 1320 A– line charging breaking current 40 A 40 A– cable charging breaking current 40 A 40 A– no-load transformer breaking current 20 A 20 A– capacitor bank breaking current 175 A 175 A

Short-time and making current tests– short-time current, asymmetrical, rms. 16 kA 16 kA– short-time current, 1 s, symmetrical 10 kA 10 kA– short-time current, 3 s, symmetrical 10 kA 10 kA– short-time current, 10 s, symmetrical 3,5 kA 3,5 kA


Sectos NXA

Technical data

ABB Transmit Oy ABB Transmit Oy

3.5 Electrical endurance

NXA 24 (IEC), NXA 27 (ANSI) NXA 36 (IEC), NXA 38 (ANSI)

3.8 Rating plate ANSI3.7 Rating plate IEC

Number of COoperation cycles

Number of COoperation cycles

5000

1000

100

10

10 A 100 A 1000 A

5000

1000

100

10

10 A 100 A 1000 A��

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3.6 Gas pressure / temperature variation curve

Gas temperature / oC

Pressure / bar

1,2

1,4

1,6

-20 °C 0 °C 20 °C 40 °C-40 °C


Sectos NXA

Accessories

Single spring mechanism

9610

14

Double spring mechanism

9610

13

Tripping coil

9610

15

4 Accessories4.1 Accessories to be installed

in the mechanism end box

Single spring mechanism A

Usually Sectos NXA switch-disconnector is equipped with a single springmechanism. This kind of spring mechanism is suitable for most applications.When the operating shaft of the switch is turned by manual or motoroperating device, the spring charges during the first part of the movement,releases in the last part of the movement, and turns the switch abruptly to the new position. Therefore the switch operates for opening and for closingwith the speed, which is completely independent from the operator or fromthe operating device (quick make – quick break principle). Depending onthe type of the motor operating device, the motor operated switch opensbetween 1...5 seconds from the command signal initiation.

Double spring mechanism B

Sectos NXA switch-disconnector can be equipped, with a double-springmechanism for rapid opening from initiation. When the operating shaftof the switch is turned from open position towards the closed position, theclosing spring charges during the first part of the movement, releases in thelast part of the movement, and turns the switch to the closed position. Thesecond spring, the opening spring, remains in charged position. The ope-rating shaft is then turned, just a little, towards to the open position, theopening spring releases and turns the switch to the open position. Thistripping to open can also be achieved by means of a tripping coil. When theoperating shaft is then turned completely to the open position, the openingspring is charged again, and it remains in charged position during the nextclosing.

Tripping coil UEJBZB2 _

The tripping coil is installed in the factory to the double-spring mechanism,and the tripping circuit is connected to the multi-pin plug-in terminal, seeconnection diagram 6.3. The total opening time of the switch-disconnectorwith tripping coil is less than 0,1 s.

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Sectos NXA

Accessories

3603 3604

3649 3604

3663 3662

Change-over contact

open closed

Standard markings

Optional markings

Auxiliary contacts NXAZK 3

Auxiliary contacts for reliable position indication can be installed in themechanism end box. The normal switch can have 3 change-over contacts.If the tripping coil is used simultaneously, one of these contacts is occupiedby the tripping circuit. The auxiliary contacts will be wired to the multi-pinplug-in terminal, see connection diagrams 6.2 and 6.3.

Multi-pin plug-in terminal NXAZH 10 M

In every Sectos NXA switch-disconnector, there is always a 10 pin weatherproof plug-in terminal fitted to the body of the switch. It is intended for theconnection of the wiring of the gas density indicator, the position indicatingauxiliary contacts and the tripping coil to the remote control terminal or to themotor operating device. Pins 1 and 6 are always used for the gas densityalarm contact or the alarm contact of the “gas low” blocking device.

Plug NXAZH 10 F _

As an option there is available a remote end plug for the command cable.If the customer prefers, the command cable can be connected to the plug inthe factory, in which case the length of the command cable must be advisedwhen ordered. See the connection diagram of the plug at 6.4.

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The cable is suitable for outdoors, it is screened and provided with 1,5 mm²flexible conductors.

Markings of the position indicator YKLW _

The position indicator of the switch-disconnector Sectos NXA fulfils therequirements of the standards IEC 129 A2 (1996) and NF C 64-140 (1990),which determine the requirements for the reliability of such an indicator.The colours chosen and the markings are such that the position of the switch-disconnector is clearly visible even in bad weather conditions.

Multi-pin terminal

Plug

Auxiliary contacts

Main contact of NXA


Sectos NXA

Accessories

Gas density indication

As a standard accessory in Sectos NXA switch-disconnectors there is atemperature compensated alarm device, which is wired to the multi-pinplug-in terminal. Please refer to diagrams 6.2 or 6.3.

The alarm contact 1-6 is normally closed (NC) and it opens, if the gaspressure in the tank falls below 1,1 bar at 20 °C. This is a proven reliablesystem for giving an alarm to the remote control system. When the switch isused with manual operation device, the alarm signal circuit can be cableddown to ground level for checking.

Gas density gauge NXAP 3

As a factory installed optional accessory for Sectos NXA switch-disconnectorthere is available a gas density gauge, an instrument indicating the insidegas pressure.

The gauge is temperature compensated, and it shows the pressuredifference between the inside of the tank and its internal referencepressure. Variation of the outside air pressure does not affect the indicationof the gauge. Therefore is actually showing the density of the SF6 gasinside of the tank. The gauge is installed below the switch tank, in the placeof the of the cap of the refilling valve.

Low gas lock-out NXAP 2

As an option for Sectos NXA switch-disconnector there is available ablocking device, which blocks the operation of the operating mechanism bymeans of a mechanical latch, released when the inside gas pressurereduces. As the lock-out mechanism operates, an indication sign becomesvisible through the position indicator window giving low pressure indication.

The gas low lock-out mechanism is installed in the factory and it replacesthe standard density indicating alarm contact. The blocking device is fittedwith an auxiliary contact, which gives indication of the operation of thedevice.

The low gas lock-out mechanism is recommended to be used with manuallyoperated switches only, and in installation places, where the outsidetemperature never falls below -10 °C and the altitude doesn’t exceed1000 m above sea level.

Operation counter

In each Sectos NXA switch-disconnector there is a mechanical operationcounter installed inside of the mechanism end box to help estimate of theremaining service life of the switch.

1 6

Gas density indication

Gas density gauge

Gas Low

Low gas lock-out


Sectos NXA

Accessories

4.2 Mounting accessories

All parts are of hot dip galvanised steel. The fixing elements describedhere are suitable for wooden poles, but there are also fixing devices available,which are specially designed for concrete and steel poles, etc. Please contactABB if special fittings are needed.

Mounting brackets NXAM _

The switch-disconnector Sectos NXA is easy to install below or abovethe crossarm using these brackets. The type NXAM 1 is included in thedelivery as a standard accessory. For other sizes of brackets for differentcrossarms, please refer to the point 5.4.

Crossarm NPTRN

The standard crossarm is 80 x 80 mm square tube. There are two standar-dised lengths, 2000 mm and 2850 mm. See dimension drawings at thepoint 5.6.

Diagonal supports and fastenings for crossarm,1-pole mounting OJUPZK 9

The set includes all necessary parts for fixing the crossarms to a woodenpole.

Fastenings for crossarm2-pole mounting OJUPZK 8

The set includes all necessary parts for fixing one end of the crossarm to a wooden pole. For 2-pole installation 2 sets are needed.

Installation below the crossarm

Installation above the crossarm

Clossarm

1-pole mounting

Crossarm

2-pole mounting


Sectos NXA

Accessories

Earthing clamp for the crossarm NPTMS 8

The connector of the earthing clamp is suitable for 16 – 63 mm2 Cuconductors.

The switch-disconnector Sectos NXA can be earthed in two different ways:either it can be earthed directly by connecting the earthing conductorto the earthing terminal of the switch itself, or indirectly through crossarmusing this earthing clamp. The switch and the crossarm need not both to beearthed, if the mounting brackets NXAM are used, because they ensure asufficient current path during fault situations.

Surge arresters MWK

To protect the switch-disconnector Sectos NXA against atmosphericovervoltages, it is often necessary to install surge arresters on one or bothsides of the switch. The new silicon rubber insulated surge arresters of ABB,type MWK are recommended for use together with Sectos NXA.For complete information about the surge arresters please refer to thebrochure: CH-AR 3007, published by ABB Hochspannungstechnik AG,Switzerland.

Brackets for surge arresters NXAM 3

The surge arresters MWK can be very conveniently installed to the samecrossarm with Sectos NXA using fittings type NXAM 3.

Earthing clamp forthe crossarm

Surge arresters

Fittings for surge arresters


Sectos NXA

Accessories

4.3 Connecting bare conductor

Sectos NXA switch-disconnector is equipped with series 400 outer-conebushings, on the top of which are normally installed outer insulators ofsilicone rubber. This makes it possible to connect an overhead linewith bare conductors directly to the switch. Silicone rubber has excellentelectrical properties, it is hydrophobic and unbreakable. The insulator hasbeen tested according to IEC 1109 salt fog test with 5000 hours exposure,which is the requirement for an insulator intended for the most severeenvironments.

Terminals NXAC_

The terminals are made of copper and they are electrolytically tinned foroptimal corrosion protection. Different holes in the terminals are availablefor different standards and line connectors. Please refer to the dimensiondrawings at the point 5.5.

Line connectors

The conductor is fitted to the terminal with a line connector. The selectionof line connector is determined by material and size of the conductor.

Installation ofsilicone rubber insulator

Terminating cable

Line connector

Bird guards

4.4 Connecting insulated cable

A cable, terminated with series 400 Tee-connector, can be connected directlyto the outer cone bushings. Please make sure that the used type oftermination kit is suitable for outdoor use. The conventional cable terminalcan be connected to the silicone rubber insulators.

Bird guards KZNC 120-160 A 01/NXA

The bare conductor connection of Sectos can be protected by means ofbird guards. When the bird guard is used, the suitable terminal and lineconnector must be also selected.

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Type Conductor Conductor Weightmaterial size/mm2 kg/pcs

OJU-ZLL 1/3 Cu 16...63 0,08NPTL 24/3 Al 62...90 0,14OJU-ZLL 3/3 Al 2 x 16...70 0,12OJU-ZLL 4/3 Al 2 x 50...240 0,34KG-36/3 Al/Cu 50...240/10...95 0,34


Sectos NXA

Accessories

4.5 Operating devices

Sectos NXA switch-disconnector can be operated by means of manual ormotor operating devices. The operating device is normally located near tothe ground level, and the mechanical movement is transferred to the switchby an operating rod, which moves up and down.

Operating rods NPTOT _

Operating rod sets are available with rods of 2 x 4 m and 3 x 3 m lengths,each set including rod supports and necessary joint pieces.

Extension rods OJUP-ZY 10

The set includes one rod of 3 m, adjoint pieces and one rod support with fittingscrews. By using several extension rods and an adequate quantity of rodsupports, it is possible to install the NXA at heights of more than 20 meters.

Rod support NPAZL 9

The operating rod is fitted to the pole with rod supports. Normally at least2 supports are needed. The extension tube set includes 1 tube support.

Protection insulator of the operating rod NPSZJ 30

The protection insulator is commonly used with wooden poles. Its purposeis to increase the safety of the operator.

Manual operating device UEKE 3

The manual operating device UEKE 3 is suitable for use with the Sectos NXAswitch-disconnector. It can be locked in open and in closed positions witha padlock.

Rod supportNPAZL 9

Rod supportNPAZL 9

Command rodNPTOT_

Protectioninsulator of thecommand rodNPSZJ 30

ManualoperatingdeviceUEKE 3


Sectos NXA

Accessories

Motor operating device

Motor operating device UEMC 50

The motor operating device is needed, when Sectos NXA switch-disconnectoris to be remotely controlled.

The motor operating device UEMC 50 can be retrofitted in the place of manualmechanism. The enclosure of the motor operating device is of stainless steel,and is protected to IP 44. Three different sizes of box are available.In the smallest one, there is room for the motor operating mechanism,batteries and battery charger. In the larger boxes there is space reservedfor the electronic devices of the remote control system.

The recommended auxiliary voltage is 24 VDC. In the box are the pushbuttons for local control and in addition every UEMC 50 has a hand crankfor emergency manual operation of the switch.

The motor operating device can be deactivated and mechanically lockedin both open and closed positions by means of a padlock. The padlock ispushed into the hole of the hand cranking shaft disconnecting the auxiliarycircuit for both remote and local control. The padlock itself mechanicallyprevents the use of the hand crank and manual operation of the switch.

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Level of accessories1 – contctors, MCB, push buttons I and O, switch local-remote2 – contactors, MCB, push buttons I and O3 – contactors4 – without contactors1–4 – limit switch, blocking switch, heating resistor, 1 NO + 1 NC

auxiliary contact

For further information and careful selection of motor operating device,please refer to the brochure of UEMC 50.


Sectos NXA

Accessories

4.6 Remote control

The switch-disconnector Sectos NXA is specially designed for remotecontrol applications of electricity distribution networks.Remote control requires a terminal unit and a communication betweenthe terminal unit and the remote control centre in addition to the motoroperating device.

One practical example of a remote control terminal is the DTU, whichcomprises a motor operating device with a stainless steel cabinet, wherethe electronic remote control terminal is installed together with a modemand communication equipment, which is usually radio. Additionally in theDTU there can be different kinds of equipment for fault indication andanalysing, such as SPEF 3A2C fault indicator.

The remote control terminal DTU is suitable for use with MicroSCADAremote control systems. Other remote control systems may require protocolconversions, which should be checked with the supplier. The motoroperating devices UEMC 50 and the Sectos NXA switch-disconnector itselfcan be used with any remote control system. The application of SPEF 2A2Cfault indicating relay together with other remote terminals might requireadaptation of the SPA-protocol.

DTU-1 type remote terminal can work as a “master station” for 7 remotelycontrolled switches, in which case the 6 switches can be equipped with asimpler DTU-1S “slave” terminals connected to the master station withoptical fibre. This arrangement permits the distance between the masterand the slave terminals up to 400 meters.

DTU-4 type terminal can work as a common remote terminal for 4 switches.In this case each switch is only equipped with UEMC 50 motor operatingdevice. The distance between the DTU 4 and the motor operators connectedto it limited in the practice to about 20 meters, because of the voltage dropin the motor circuits.

The communication between the DTU terminals and the remote controlcenter can be realised by many different means, using radios, telephonelines, other types of cables, etc.

DTU 1S

DTU 1

UEMC 50_

DTU 4

DTU 1 with "slave" stations

DTU 4 with 3 additionalmotor operating devices


Sectos NXA

Accessories

4.7 Indication of faults

With Sectos NXA switch-disconnector it is possible to use different kinds ofequipment for fault indication. Most of fault indicating devices are normallyconnected to the remote control system, but there are also such devices,which give fault indication locally, for instance with flashing light.

Current sensor KOKU 072 G3

The current sensor can be installed around the bushings of Sectos NXAswitch-disconnector. Because the bushing insulators form the primary insu-lation, the same current sensor is suitable for all line voltages. The currentsensor KOKU 072 G3 applies to the fault indicator SPEF 3A2C.

The current sensors of each phase are connected to the shielded downleadcable KOHZ 11 in the branching box SPEC 4, which also includes an over-voltage protection. When ordering the down-lead cable, please advise therequired length. All above mentioned parts, - current sensors, branching box, and cables, can be supplied either with screw connectors or with plug-in connectors.

Fault indicator SPEF 3A2C

The fault indicator gives indication of short-circuit, over-load, phase un-balance and earth-fault situations, and in addition it is a useful informationsource for observation of the load under normal conditions. The fault indicatoris connected to the remote control terminal through digital SPA-bus.The remote control computer can then read from the memory of the faultindicator the magnitudes of the fault currents and the normal phase currentsat any time. Also it is possible to program to the SPEF 3A2C relay alarm limitsfor over-load conditions, and to change these limits directly from the remotecontrol centre. The current information to the indicator comes from thesensors KOKU 072 G3 readily at such a level that no measured valueconverters are needed. The fault indicator needs an auxiliary voltage,24 VDC, which is normally obtained from the same battery, feeding alsothe motor, the remote terminal and the communication equipment. Forcloser information, please refer to the technical brochure of SPEF 3A2C.

Fault indicator sensing the variationsof electric and magnetic fields Linetroll 3000

An example of a different kind of fault indicating device is Linetroll 3000,manufactured by Nortroll AS, which is installed to the pole below the electricline. The device senses the intensity of electric field and variationsof magnetic field. It indicates a short-circuit or an earth-fault situation bymeans of a flashing light or by a normally open contact, which can givethe alarm to the remote control system. The advantage of the Linetroll 3000is that there is no need to connect any sensors to the medium voltage line.For further information, please refer to the brochure of Linetroll 3000.

Sectos NXA switch-disconnectorwith fault indicators

Connectionbox includingover voltageprotection

Down-leadcable

Motoroperatingdevice

Faultindicator

Current sensors


Sectos NXA

Dimension drawings

5 Dimension drawings5.1 Sectos NXA switch-disconnectors

Models for cable Tee-connectors: NXA 24 E_, NXA 36 E_,NXA 27 E_, NXA 38 E_

1198

55 700669

674

162 42

ø14126

462

151

110°

Models for bare conductors: NXA 24 C_, NXA 36 C_NXA 27 C_, NXA 38 C_

682

55

700669

162 42

674

151110°

462

126ø14

Dimensions ofthe hanging edge

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Dimensions ofearthing terminal


Sectos NXA

Dimension drawings

5.2 Manual operating deviceUEKE 3

5.3 Motor operating device

480

200

280

ø22

525 570

200

520

ø22

570

300

620

ø22

615

UEMC 50_2_ UEMC 50_3_UEMC 50_1_

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Sectos NXA

Dimension drawings

5.4 Mounting brackets

NXAM 1 NXAM 2

NXAM 5NXAM 4

80 . . 100 M12

80 . . 100

120 . . 160 M12

120 . . 160

100 . . 160

M12100 . .160

ø13

ø13

80 . . 100

M1280 .. 100

Brackets for fitting Sectos NXA_ above the crossarm.

Brackets for fitting the Sectos NXA_ below the crossarm.


5.5 Terminals

Sectos NXA

Dimension drawings

"Australia" modeltype NXAC 2

Terminal for OJUP ZLL line connectorstype NXAC 1

150°

ø17

ø11

9

ø13

110

23

526

40

150°

5

ø17

ø11

ø13

30

110

30

60

150°

5

ø13

ø13

ø17

40

44,5

125

5

150°

ø17

ø13

ø13

40

50

130

Terminal for ANSI-connectorstype NXAC 3

Terminal for IEC-connectorstype NXAC 4

ø17

ø14

ø14

46

5

80

126

44,5

Example of a terminal forANSI connectors, suitable for use together

with bird guards, type NXAC 5


Sectos NXA

Dimension diagram

5.6 Clossarm

Crossarm for up to 24 kV, type NPTRN1T6

2000

90027

27

27

25 25

50 1000

1900

2222 22

5050

80*80*4

1425

712,5712,550

22

50

2850

2750

3*22 80*80*4

Crossarm for 36 kV, type J401464


Sectos NXA

Connection diagrams

6 Connection diagrams

6.1 Main circuit diagram of Sectos NXA

Kaasusäiliö

F

I 0

6.2 Auxiliary circuit diagram of the switch equippedwith single spring type actuator

Gas densityalarm contact

Position indicator

Auxiliary contacts

Spring mechanism

Operating shaft

Multi-pin plug-in terminal

Auxiliary contacts

12

3 6

45 78

9

1 6 2 7 3 8 4 5 9 10

Main circuit Gas densityalarm contact


Sectos NXA

Connection diagrams

6.4 Down-lead cable plug

6.3 Auxiliary circuit diagram of Sectos NXA equipped withdouble-spring type actuator

12

3 6

45 78

9

1 6 2 7 3 8 4 5 9 10

Tripping coil Auxiliary contacts

6 7 8 9 6

6 7 8 9 6

1 2 3 4 5

1 2 3 4 5The shield of the cable is connectedto the frame of the plug.

Main circuit Gas densityalarm contact

Multi-pin plug-in terminal


6.5 Connection of curent sensors to fault indicator

Sectos NXA

Connection digrams

L1

L2

L3

S1

B W

S2

WB WB

X1/1 X1/3 X1/5 X2/1 X2/3 X2/5 X3/1 X3/3 X3/5

X4/1 X4/2 X4/3 X4/4

B W Y R

X1-1 X1-2 X1-3 X1-7

S1 S2 S1 S2

Current sensors (3 pcs) KOKU 072 G3

SPEC 4

Fault indicator SPEF 3A2 C

B BlueW WhiteY YellowR Red


NX

A 1

GB

97-

03W

aasa

Gra

phic

s O

y50

00, 9

7-03

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Sectos NXA - Aparatura energetyczna, przekładniki SN ... ABB Power Distribution Index 1 Sectos NXA,...

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Transcript of Sectos NXA - Aparatura energetyczna, przekładniki SN ... ABB Power Distribution Index 1 Sectos NXA,...