240-33 Two- & Three-Phase MagneX Interrupterphylum.pxecorp.com/assets/_images/products/pdf/24033.pdf · The Cooper Power Systems MagneX® Interrupter is an overcurrent protective

GENERALThe Cooper Power Systems MagneX®

Interrupter is an overcurrent protectivedevice that protects distribution transformers from damaging overloadsand secondary faults, and is also usedfor switching the transformer “on” or“off.” As a transformer protectivedevice, the MagneX Interrupter combines safety and efficiency witheconomic operation.

It is an integral assembly, which doesnot use a troublesome linkage orrequire calibration, making installationand operation fast and trouble free.

The housing is made of an ultravioletstabilized, high-strength, glass-filledthermoplastic material. The operatingshaft is sealed against leakage with adouble-Viton® O-ring seal.

ELECTRICAL RATINGS

APPLICATIONThe three-phase MagneX Interruptercombines the functionality of threeBay-O-Net fuses and one three-phaseon/off loadbreak switch into one protective device. This allows transformer manufacturers more flexibility in application of the productand potentially reduces the space

required to install the device on thetransformer front plate. This productis ideal for three-phase pad-mountedtransformer applications.

The two-phase MagneX Interrupter isdesigned for single-phase applicationswhere disconnecting both primary coilleads is desirable. This feature isideal for two-bushing transformers,where a fault on either leg of thetransformer may cause activation ofthe protective device.

Secondary faults and overloads will tripthe MagneX Interrupter “open.”However, the device can be resetonce the condition is corrected. TheMagneX Interrupter, in coordination witheither an isolation link or current-limitingfuse, also clears primary faults.

The MagneX Interrupter can also beused as a primary switch to disconnectthe transformer windings – not just theload. This eliminates core (no-load)losses on transformers not in service.Residual voltage problems associatedwith secondary breakers during bankingof transformers are also eliminated.

THREE-PHASE MAGNEXOPERATIONFigure 2 demonstrates the circuit diagram for the three-phase MagneXInterrupter with single-phase sense,single-phase trip. The three-phaseMagneX with single-phase sense, single-phase trip contains one sensorsper phase. It reacts to fault currents onone phase and will cause tripping of thatphase only. The MagneX then can bereset via the single operating handle byopening all three phases and closingall phases back in simultaneously.

Fusing Equipment

Two- & Three-Phase MagneX® Interrupter

Electrical Apparatus

240-33

1June 2004 • New IssuePrinted in U.S.A.

Figure 2.Three-phase MagneX, single-phasesense, single-phase trip.

Figure 1.Two and Three-phase MagneX.

kV Amps

Impulse 1.2 x 50 Microsecond Wave 150 –

60 Hz, 1 Minute Voltage Withstand 50 –

Continuous Current Rating – 42Switching Load Currents – 42

TABLE 1Voltage Ratings and Characteristics

Voltage RMS RMSkV-LG Symmetric Asymmetric

(A) (A) (A)

8.3 2800 420015.5 1500 225023.0 500 750

TABLE 2Interrupting Rating

Figure 3 demonstrates the circuit diagram for the three-phase MagneXInterrupter with single-phase sense,three-phase trip, containing one sensor in two of the three phases.This product should only be applied todelta-connected primary transformers,where any fault current flow in onephase will also flow in an adjacentphase. It reacts to fault currents onone phase and will cause tripping ofall three phases. The MagneX thencan be reset via the single operatinghandle by opening all three phasesand closing all phases back in simultaneously.

The three-phase MagneX with single-phase sense, three-phasetrip should always be used in serieswith at least one backup current-limiting fuse in each of the three-phases.

The backup current limiting fuses(see ELSP catalog section 240-50)provide high-current interruptioncapability.

Figure 4 shows the circuit diagram forthe two-phase MagneX Interrupter. Thetwo-phase MagneX was specificallydesigned for single-phase, two bushingtransformers, where disconnection ofboth bushings is desired followingfault/overload detection. The MagneXwill react to a fault sensed in either legof the transformer primary. Interruptiontakes place in both interruption

chambers simultaneously, discon-necting both legs of the transformerfrom the circuit.

OPTIONAL HANDLEASSEMBLIESA standard handle, as shown inFigures 5, is typically used in overheadpoletype transformers. It is also usedin underground pad-mounted transformer applications. The MagneXhandle is reversible to enhance functionality and provide for optimalorientation of the handle in pad-mountedtransformer applications. It is made ofan ultraviolet stabilized high-strength,glass-filled thermoplastic material.The lower slotted portion of the handleis made of a flexible ultraviolet stabi-lized elastomeric material. The handlerequires five pounds (2.27 kg) of forceto operate manually. It allows flexibilityfor excessive force during operation.

Two- & Three-Phase MagneX™ Interrupter

2

Figure 4.Two-phase MagneX Interrupter.

Figure 3.Three-phase MagneX, single-phasesense three-phase trip.

Figure 5.MagneX assembly – front/side/back views (with standard handle hardware kit).

Note: Dimensions given are for reference only, inches (mm)

JAW 6-20-03

(4.8 mm).19"

GASKET

(46.9 mm)1.85"

(165.61 mm)6.52"

(333 mm)13.11" (LENGTH OF 2 PHASE)

(500.4 mm)19.70" (LENGTH OF 3 PHASE)

(8 mm).32"

(54.6 mm)2.15" (54 mm)

Ø 2.1"

(160.6 mm)6.32"

(38.9 mm)1.53"

CONNECTION POINT FOR ISOLATION LINK (2 PHASE ONLY) OR ELSP (PARTIAL RANGE CURRENT-LIMITING) FUSE (2 OR 3 PHASE)

(111.7 mm)4.40"

2.97"(75.3 mm)

TANK WALL

NUTHANDLE

SNAPRING

(95.3 mm)3.75"

(157.5 mm)HANDLE SHOWNIN STANDARDORIENTATION

OPTIONAL HANDLE ORIENTATIONMOVEMENT SWING

6.20"

(114.8 mm)4.52"

INSTALLATIONThe MagneX Interrupter is mountedunder-oil on the primary side of thetransformer. No special tools arerequired. The MagneX assembly ismounted through the transformerwall. The incoming high voltage leadis connected first to the isolation linkor to the current-limiting fuse and thento the MagneX. The coil lead is thenconnected to the lower MagneX connection point (See Figure 8).Refer to Installation InstructionsS240-33-1 for details.

PRODUCTION TESTSTests are conducted in accordance withCooper Power Systems requirements.■ 100% Physical Inspection■ 100% Electrically Tested to Meet

Minimum Trip and Maximum TripClear TCC Curves

■ Periodic Fluoroscopic Analysis (X-ray)

ORDERINGINFORMATIONThe three-phase MagneX Interrupteris available in two design variations.

The first is a single-phase sense, single-phase trip version, for wye-connected transformers. Thisdesign is ideal for applications wherecustomers desire fault sensing on onephase and tripping on that phase only.This option can be used with either anisolation link (recommended as a min-imum) or backup current- limiting fuse.

The second three-phase MagneXdesign option is a single-phase sense,three-phase trip version, for deltaconnected transformers. This designis well suited for three-phase deltaconnected transformer applications(this design should NOT be used onwye-connected transformer primaries).The three-phase MagneX Interrupterwith single-phase sense, three-phase trip should always be usedwith backup current-limiting fusing.

For three-phase delta primary connected transformers, use Table 3to determine the correct MagneX sensor size and the appropriate ELSPbackup current-limiting fuse requiredfor the application. Use Table 7 todetermine the exact MagneX catalognumber.

For three-phase wye primary con-nected transformers, use Table 4 todetermine the correct MagneX sensorsize and the appropriate ELSP back-up current-limiting fuse required forthe application, or refer to Table 6 forthe appropriate isolation link. UseTable 7 to determine the exactMagneX catalog number.

For the two-phase MagneX, refer toTable 5 to determine the correctMagneX sensor size for the applica-tion. Use Table 6 to determine theappropriate isolation link, or Table 9to determine the appropriate ELSPbackup current-limiting fuse for theapplication. Use Table 7 to determinethe exact MagneX catalog number.NOTE: When ordering a MagneX

Interrupter, the standardhandle kit and hardwaremust be ordered separately.See Table 8 for the appro-priate handle and hardwarekit catalog number.

240-33

3

Figure 6.Open/Closed handle positions(Standard positions shown).

(95.3 mm)3.75"

(157.5 mm)6.20"

(114.8 mm)4.52" HANDLE IN

STANDARD CLOSED POSITION

HANDLE IN STANDARD OPENPOSITION

STANDARD HANDLE ORIENTATION MOVEMENT SWING

OPTIONALHANDLEORIENTATIONMOVEMENTSWING

Figure 7.Tank mounting hole detail.

Note: Exterior mounting surface extending 1/2" outward from the tank hole outer edge shall be flat and clear ofsurface obstructions.

1.125"(28.5 mm)

0.156" rad.(4 mm)

Figure 8.Lead connection points.

CONNECTION POINT FOR ISOLATION LINK (2 PHASE ONLY) OR ELSP (PARTIAL RANGE CURRENT LIMITING) FUSE (2 OR 3 PHASE)

[THE HIGH VOLTAGE LEAD (FROM BUSHING) IS CONNECTED TO THE OTHER END OF THE ISOLATION LINK OR ELSP FUSE]

CONNECTION POINT BETWEEN MAGNEX AND CORE COIL

2.25"(57 mm)

4


TABLE 33-Phase MagneX Recommendations for Transformers with Delta ConnectedPrimary Windings (Single-Phase Sense, Three-Phase Trip)

Transformer Assumed RecommendedkVA Primary Minimum MagneX Recommended

Rating Voltage Impedance Sensor ELSP

45 2.4 1.60% E18 3543125M71M75 2.4 1.60% E25 3543150M71M

112.5 2.4 1.80% E40 3543125M71M x 2150 2.4 2.00% E50 3543150M71M x 2

45 4.16 1.60% E10 3543080M71M75 4.16 1.60% E18 3543125M71M

112.5 4.16 1.80% E25 3543150M71M150 4.16 2.00% E30 3543165M71M225 4.16 3.00% E50 3543125M71M x 2

100 6.6 1.80% E12 3543100M71M160 6.6 2.00% E18 3543125M71M200 6.6 2.00% E25 3543150M71M250 6.6 3.00% E30 3543165M71M400 6.6 4.00% E50 3543125M71M x 2

45 7.2 1.60% E06 3543050M61M75 7.2 1.60% E10 3543080M71M

112.5 7.2 1.80% E12 3543100M71M150 7.2 2.00% E18 3543125M71M225 7.2 3.00% E25 3543125M71M300 7.2 3.50% E30 3543150M71M500 7.2 4.00% E50 2543125M71M x 2

100 11.0 1.80% E10 3543080M71M160 11.0 2.00% E12 3543080M71M200 11.0 2.00% E18 3543125M71M250 11.0 3.00% E18 3543125M71M400 11.0 4.00% E30 3543150M71M500 11.0 4.00% E40 3543125M71M x 2630 11.0 4.00% E50 3543125M71M x 2

45 12.0 1.60% E03 3543030M61M75 12.0 1.60% E06 3543030M61M

112.5 12.0 1.80% E10 3543065M61M150 12.0 2.00% E12 3543080M71M225 12.0 3.00% E18 3543100M71M300 12.0 3.50% E25 3543100M71M500 12.0 4.00% E30 3543150M71M750 12.0 5.75% E50 3543165M71M

45 13.2 1.60% E03 3543030M61M75 13.2 1.60% E06 3543050M61M


100 15.0 1.80% E06 3544050M61M160 15.0 2.00% E10 3544065M61M200 15.0 2.00% E12 3544080M71M250 15.0 3.00% E18 3544100M71M400 15.0 4.00% E25 3544100M71M500 15.0 4.00% E30 3544125M71M630 15.0 4.00% E40 3544125M71M x 2800 15.0 5.75% E50 3544125M71M x 2

100 20.0 1.80% E06 3544050M61M160 20.0 2.00% E10 3544065M61M200 20.0 2.00% E10 3544065M61M250 20.0 3.00% E12 3544080M71M400 20.0 4.00% E18 3544100M71M500 20.0 4.00% E25 3544100M71M630 20.0 4.00% E30 3544125M71M800 20.0 5.75% E40 3544125M71M

1000 20.0 5.75% E50 3544150M71M


1000 22.0 5.75% E40 3544150M71M1250 22.0 5.75% E50 3545165M71M

240-33

5

TABLE 3 (Continued)3-Phase MagneX Recommendations for Transformers with Delta ConnectedPrimary Windings (Single-Phase Sense, Three-Phase Trip)



45 24.9 1.60% E01 3544030M61M75 24.9 1.60% E03 3544030M61M


1000 24.9 5.75% E30 3544125M71M1500 24.9 5.75% E50 3545165M71M

45 27.6 1.60% E01 3545030M61M75 27.6 1.60% E03 3545030M61M




1000 33.0 5.75% E30 3545100M71M

45 34.5 1.60% E01 3545030M61M75 34.5 1.60% E03 3545030M61M


1000 34.5 5.75% E25 3545100M71M

Notes:MagneX recommendations based on ■ Minimum trip curves, and Maximum trip and clear curves, R240-91-302.■ Deration factor of 0.5% per degree C above ambient (25° C).■ Allowable loading greater than 140% for four hours in accordance with ANSI®/IEEE C57.91.1981™ Guide

for Loading Distribution Transformers, Table 6.

MagneX/ELSP coordinations based on coordination requirements of single-phase sense, three-phase trip versionMagneX interrupter. Proper coordination requires delta connected transformer primary.

Proper protection requires that a backup current-limiting fuse be used in series with each MagneX interruptionchamber. DO NOT USE AN ISOLATION LINK WITH THE TRHEE-PHASE MAGNEX. Failure to use backup current-limiting fuse in series with the MagneX can result in an unprotected phase.

Backup current limiting fuse may be rated for line-to-neutral voltage, as the three-phase MagneX is three-phaserated. Added backup protection can be achieved using phase-to-phase rated backup current-limiting fuse.


6

TABLE 43-Phase MagneX Recommendations for Transformers with WYE ConnectedPrimary Windings (Single-Phase Sense, Single-Phase Trip)



45 2.4 1.60% E18 3543080M71M75 2.4 1.60% E25 3543125M71M

112.5 2.4 1.80% E40 3543165M71M150 2.4 2.00% E50 3543125M71M x 2

45 4.16 1.60% E10 3543050M61M75 4.16 1.60% E18 3543080M71M

112.5 4.16 1.80% E25 3543100M71M150 4.16 2.00% E30 3543125M71M225 4.16 3.00% E50 3543150M71M

100 6.6 1.80% E12 3543065M61M160 6.6 2.00% E18 3543100M71M200 6.6 2.00% E25 3543100M71M250 6.6 3.00% E30 3543100M71M400 6.6 4.00% E50 3543150M71M

45 7.2 1.60% E06 3543030M61M75 7.2 1.60% E10 3543050M61M

112.5 7.2 1.80% E12 3543065M61M150 7.2 2.00% E18 3543080M71M225 7.2 3.00% E25 3543100M71M300 7.2 3.50% E30 3543030M71M500 7.2 4.00% E50 3543150M71M

100 11.0 1.80% E10 3544050M61M160 11.0 2.00% E12 3544050M61M200 11.0 2.00% E18 3544080M71M250 11.0 3.00% E18 3544080M71M400 11.0 4.00% E30 3544100M71M500 11.0 4.00% E40 3544125M71M630 11.0 4.00% E50 3544150M71M

45 12.0 1.60% E03 3544030M61M75 12.0 1.60% E06 3544030M61M


45 13.2 1.60% E03 3544030M61M75 13.2 1.60% E06 3544030M61M




1000 20.0 5.75% E50 3545150M71M


1000 22.0 5.75% E40 3545125M71M1250 22.0 5.75% E50 3545150M71M

240-33

7

TABLE 4 (Continued)3-Phase MagneX Recommendations for Transformers with WYE ConnectedPrimary Windings (Single-Phase Sense, Single-Phase Trip)



45 24.9 1.60% E01 3544030M61M75 24.9 1.60% E03 3544030M61M


1000 24.9 5.75% E30 3544100M71M1500 24.9 5.75% E50 3544150M71M

45 27.6 1.60% E01 3545030M61M75 27.6 1.60% E03 3545030M61M


1000 27.6 5.75% E30 3545100M71M1500 27.6 5.75% E50 3545150M71M


1000 30.0 5.75% E30 3545100M71M1250 30.0 5.75% E40 3545125M71M1600 30.0 5.75% E50 3545150M71M


1000 33.0 5.75% E30 3545080M71M1250 33.0 5.75% E40 3545100M71M1600 33.0 5.75% E40 3545100M71M2000 33.0 5.75% E50 3545125M71M

45 34.5 1.60% E01 3545030M61M75 34.5 1.60% E03 3545030M61M


1000 34.5 5.75% E25 3545080M71M1500 34.5 5.75% E40 3545100M71M2000 34.5 5.75% E50 3545125M71M

Notes:Line-to-neutral rated fuses can be used on Gnd Y-Gnd Y transformers with less than 50% delta loading

MagneX recommendations based on ■ Minimum trip curves, and Maximum trip and clear

curves, R240-91-310.■ Deration factor of 0.5% per degree C above ambient

(25° C).■ Allowable loading greater than 140% for four hours

in accordance with ANSI®/IEEE C57.91.1981™

Guide for Loading Distribution Transformers, Table 6.

MagneX/ELSP coordinations based on coordinationrequirements of single-phase sense, single-phase tripversion of the MagneX interrupter. Proper coordinationrequires WYE connected transformer primary.

Backup current limiting fuses may be rated for line-to-neutral voltage for Gnd Y - Gnd Y connections, withless than 50% delta loading ONLY. If this guideline isnot followed, recovery voltages exceeding the backupcurrent-limiting fuse may cause fuse failure.

In all other cases, voltage rating of the backup current-limiting fuse must be line-to-line rated.

Note: The MagneX recommendations above 22 kVare for Gnd.Y – Gnd. Y transformers with less than50% delta loading ONLY.

TABLE 5Two-Phase MagneX Recommendations

Primary Voltage kV

kVA/kV 2.4 4.16 4.8 6.9 7.2 7.62-7.97 8.32 12.00 12.47-13.2 13.8-14.4 19.92

10 E06 E06 E03 E03 E03 E03 E03 E01 E01 E01 E0115 E10 E06 E06 E03 E03 E03 E03 E03 E03 E03 E01

25 E18 E10 E10 E06 E06 E06 E06 E03 E03 E03 E0337.5 E25 E18 E12 E10 E10 E10 E10 E06 E06 E06 E03

50 E30 E18 E18 E12 E12 E12 E10 E06 E06 E06 E0675 E50 E30 E25 E18 E18 E18 E18 E10 E10 E10 E06

100 - E40 E30 E25 E25 E25 E18 E12 E12 E12 E10167 - - E50 E40 E40 E30 E30 E18 E18 E18 E12

Note:Recommendations are based on:■ Minimum trip curves, and Maximum trip and clear curves, R240-91-310.■ Deration factor of 0.5% per °C above 25 °C.■ Allowable loading greater than 140% for four hours in accordance with ANSI/IEEE C57.91.1981 Guide for Loading Distribution Transformers, Table 6.

TABLE 6Isolation Link – MagneX CorrelationChart

SensorNumber Isolation Link

E01 3637803B01E03 3637803B08E06 3637803B02E10 3637803B09E12 3637803B10E18 3637803B03E25 3637803B03E30 3637803B05E40 3637803B05E50 3637803B05


8

Note:Table shows minimum recommended ELSP Fuse ratings. Recommended ELSP Backup Fuse (described in Catalog Section 240-50) will coordinate with the MagneXInterrupter and melt on internal transformer faults. The MagneX Interrupter recommendations are based on:■ Minimum trip curves, and Maximum trip and clear curves R240-91-310.■ Deration factor of 0.5% per °C above 25°C.■ Allowable loading greater than 140% for four hours in accordance with ANSI/IEEE C57.91-1981 guide for

Loading Distribution Transformers, Table 6.■ 30, 40, 50 and 65 A ELSP Fuses are the “Mini” Configuration (I.E. 354_ _ _ _ M61M Series).■ All coordinations are based on latest vintage ELSP designs. Catalog numbers for fuses larger than 65 A

have M71M suffix, 3543_ _ _M71M for 8.3 kV fuses, 3544_ _ _M71M for 15.5 kV fuses and 3545_ _ _M71M for 23.0 kV fuses.

TABLE 9Recommended Two-Phase MagneX Interrupter and ELSP Current-Limiting Fuse Combinations

Nominal 8.3 kV 15.5 kV 23 kVSingle Phase

(kV 2.4 4.16 4.8 6.9 7.2 7.62- 8.32 12.0- 12.47 13.8- 19.92Phase-to-ground) 7.97 13.2 14.4

10 kVAELSP Rating 40 40 30 30 30 30 30 30 30 30 30MagneX Element E06 E06 E03 E03 E03 E03 E03 E01 E01 E01 E01

15 kVA .ELSP Rating 50 40 40 30 30 30 30 30 30 30 30MagneX Element E10 E06 E06 E03 E03 E03 E03 E03 E03 E03 E01


37.5 kVAELSP Rating 125 100 65 50 50 50 50 40 40 40 30MagneX Element E25 E18 E12 E10 E10 E10 E10 E06 E06 E06 E03


75 kVA ELSP Rating 165 150 125 100 100 100 100 50 50 50 40MagneX Element E50 E30 E25 E18 E18 E18 E18 E10 E10 E10 E06

100 kVAELSP Rating 150 150 125 125 125 100 65 65 65 50MagneX Element — E40 E30 E25 E25 E25 E18 E12 E12 E12 E10

167 kVAELSP Rating 165 150 150 150 150 100 100 100 65MagneX Element — — E50 E40 E40 E30 E30 E18 E18 E18 E12

TABLE 7MagneX Significant Digit Catalog Number System

Example: To order a three-phase MagneX Interrupter with single-phase sense, three-phase trip, with float and E12 sensor, the catalog number would be MX3BN1MDE12

Standard Options

Digits: 1 2 3 4 5 6 7 8 9 10 11M X 3 B N 1 M D E 1 2

Phases2-Two3-Three

Trip TypeM-Multi-Phase

Trip (M for2-Phase)

SystemConnectionD-Delta (2-Phase)

Y-Wye

SensorSizeE01E03E06E10E12E18E25E30E40E50

OverloadN-Non EO

Float1-w/Float2-w/o Float

ProductMagneX

IndicatorB-w/o Indicator

CatalogDescription Number

Standard Handle Kit & Hardware, w/o Emergency 3638535A04Overload

Standard Handle Kit & Hardware, with Emergency 3638535A05Overload

TABLE 8Hardware Kit

Two- and three-phase MagneX is not yet availablewith emergency overload feature.

1045 Hickory StreetPewaukee, WI 53072 USAwww.cooperpower.com

© 2004 Cooper Industries, Inc.MagneX® Interrupter is a registered trademark of Cooper Industries, Inc.Viton® is a registered trademark of E.I. DuPont Demours & Company.

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240-33 Two- & Three-Phase MagneX Interrupterphylum.pxecorp.com/assets/_images/products/pdf/24033.pdf · The Cooper Power Systems MagneX® Interrupter is an overcurrent protective