Medium Voltage Distribution Rollarc R400-R400D contactor to kv
Description ield of application and utilisation range Description The Rollarc three-pole indoor contactor uses sulphur hexafluoride (S) gas for insulation and circuitbreaking. ircuit-breaking is based on the rotating arc principle. The basic version is made up of three pole units installed in the same insulating enclosure. The part of the enclosure containing the active parts of the poles is filled with S gas at a gauge pressure of.5 bars. There are two types of Rollarc contactors: c the R400 with magnetic holding c the R400D with mechanical latching. ield of application Protection and control of: c MV motors, c capacitor banks and power transformers. Utilisation range 0 8 Isc rms (ka) 0 5 5 7 U (kv) 8 0 5 7, 0 8 4 9 : MV connections : LV connections : auxiliary contacts 4 : pressure switch (optional) 5 : electromagnetic operating mechanism Main advantages : mechanical latching device (R400D) 7 : opening release 8 : fixation points 9 : insulating enclosure 0 : rating plate c a modern and tested circuit-breaking technique featuring S safety, c no maintenance for active parts, c high mechanical and electrical endurance, c low switching surges without additional devices (surge arrester), c insensitivity to the environment, c gas pressure may be continuously monitored. Standards Rollarc complies with the following standards and specifications: EI publication 0470 EI 040 BS 775 part NEMA IS -4 VDE 00 partie 0-8-84 Installation references LMER, MIHELIN, SHELL, ES, R, PEHINEY, NAPHTAHIMIE, USINOR, SAILOR, LLA. NULEAR AND ONVENTIONAL THERMAL POWER STATIONS. MINES DE SAAR (GERMANY) NOKIA (INLAND) KAAK (SWEDEN). 4 R400 / R400D Rollarc contactor
Installation type The Rollarc R400 and R400D contactors are available in three versions: Basic version: ontactor alone, without the cradle. ixed version: The contactor with the control auxiliaries is mounted on a fixed cradle. Withdrawable version: The contactor with the control auxiliaries is mounted on a withdrawable cradle. ixed and withdrawable versions may be equipped with fuses when the short-circuit current is greater than the contactor rating. The fuses used are of the indoor usarc type with strikers that actuate the contactor opening mechanism. R400 / R400D Rollarc contactor 5
Description of the basic version Enclosure The epoxy resin enclosure ensures: c high mechanical strength enabling use as a support for the active parts and resistance to electromechanical stress. c excellent dielectric strength due to the nature of the material and the design. c a very reliable seal (sealed pressure system in compliance with standard IE 005, 987 edition, appendix EE). The filling pressure remains constant throughout the life of the contactor. Active parts and operating mechanism The essential parts include the: c arc interruption device, c insulating rod which actuates the mobile contacts and the corresponding fixed terminal. These parts are housed in an enclosure which is sealed for life and are thus totally insensitive to the environment. The resulting elimination of corrosion increases the reliability of the device. Electromagnetic coils ROLLAR is actuated by electromagnetic coils that ensure closing and hold the device in the closed position. coil Auxiliary contacts The auxiliary switch subassemblies are always mounted on the enclosure. Mechanical latching The R400D is actuated by electromagnetic coils that ensure closing of the device and has a mechanical latching device which holds the contactor in the closed position without a continuous power supply. A release is used to free the latching mechanism. Mechanical latching device Description of operation: see page 9 R400 / R400D Rollarc contactor
Electrical characteristics Electrical characteristics rated rated insulation breaking capacity rated making capacity sec. mechanical endurance voltage level at U (kv) current () with fuses short Ua impulse () mn (prospective time kv (50-0 Hz)./50 µs 50-0 Hz ka with fuses () A current) current kv peak kv rms (ka) (ka) peak (ka) ka rms. to 4.7 0 0 0 50 400 5 5 0 00 000 operations (magnetic holding) 7. 0 0 0 50 400 5 5 0 00 000 operations (mechanical latching) 0 8 8 40 400 0 00 8 Opening time at U Breaking time losing time without relays: 0 to 40 ms without relays: 40 to 0 ms without relays: 75 to 45 ms with relays: 0 to 50 ms with relays: 50 to 70 ms with relays: 85 to 55 ms () optional: 75 kv impulse/8 kv rms on basic version only. () usarc fuses see sheet A 0479E (fuses - kv). () 400A continuous (no overload possible). ontrol circuit D A rated supply voltage (Un) 48, 0, 0, 5, 0 V 0, 7, 0 V (4) power consumption: pick-up 050 W 900 VA seal-in 0 W 40 VA opening 80 W 00 VA (4) for other values, consult us. Auxiliary switches rated current breaking capacity 0 A : (L/R = 0.05 s) 0.5 A / 0 V A : (p.f. = 0.) 0 A / 0 V Electrical endurance I (A) This curve indicates the number of operations N according to the breaking current I, in class A or A4. c R400 v 00 000 operating cycles at 50A v 50 operating cycles at 0 000A c R400D v 00 000 operating cycles at 00A v 50 operating cycles at 0 000A 0000 5000 000 000 000 500 00 00 00 50 40 0 R400 R400D N 5 0 50 00 000 000 0000 00000 00000 R400 / R400D Rollarc contactor 7
Maximum switching capacities When the contactor is used in conjunction with fuses, the maximum switching capacities may be determined using the fuse curves and by taking into account: c the characteristics of the load (motor starting currents, starting times, transformer inrush currents), c the amplitude of the limited interrupted current which is a function of the prospective fault current and the fuses employed. The limited interrupted current should not exceed the electrodynamic withstand capacity of the contactor. or values less than those presented in the table below, see: Page, for motor control, technical sheet A 0479E for transformers. service without fuse with fuse voltage motors () transfo. capacitor max. fuse motors kw () transfo. capakv kw kva banks rating 5 sec. start ls/in = 0 s. start ls/in = (standard citors kvar see document starts/h: starts/h: starts/h: starts/h: max. rating) (single A0479E kva bank) (l=9 mm) () Kvar. 50 800 55 50 0 00 00 940 000 790. 90 95 70 50 0 50 50 00 50 85 4. 90 70 585 00 80 75 75 5 000 800. 00 00 50 00 95 5 5 050 00 70 7. 80 95 740 00 40 70 70 45 00 85 0 490 5455 80 00 50 445 445 445 50 90 50 545 4570 00 5 55 55 55 00 55 () with p.f. = 0,9 η = 0,94 () for higher fuse ratings, consult us. *Note : use ratings depend on the maximum power. or lower powers, the correct fuse rating must be determined (see page ). 8 R400 / R400D Rollarc contactor
ontactor operating conditions (without fuses) IE standard 0470 (chapter ) defines three types of contactor operation: 0 u 8 h t 0 cycle t 0 t t t c continuous operation In position, the contactor equilibrium temperature is reached. c periodical intermittent operation (or intermittent) In position, the contactor equilibrium temperature is not reached. c short-time operation In position, the contactor equilibrium temperature is not reached. t: standardized values 0 mn - 0 mn - 0 mn - 90 mn t: time required for the contactor to cool to the temperature of the cooling medium Intermittent and short-time operation Allowable overcurrents The two sets of curves presented here can be used to determine allowable overcurrents in the Rollarc contactor: c the maximum value of an overcurrent and the cooling time. Using the permanent current value Ip, figure can be used to determine the maximum duration of Toc along line. The time required for cooling Tc to ensure that the equilibrium temperature is not exceeded may be determined using figure. Example: a Rollarc contactor with a permanent operating current lp = 40A can withstand a temporary overload of 400A for seconds. The cooling time Tc is: v 5 minutes if the circuit is open v 8 minutes if a 0A current flows through the contactor v 48 minutes if a 00A current again flows through the contactor. c yclical overcurrent the fourth parameter (see line between figures and ) can be determined when three of the four below are known: v Ioc overcurrent v Toc duration of overcurrent v Ic cooling current v Tc duration of cooling Example: Ioc 00A for 0 seconds Tc 00A for minutes Tr 50 min 00 min 0 min 40 min 5 min 5 min 0 min 7 min 5 min min min,5 min min 50 s 40 s 0 s 0 s ig. Ts 0 min 0 min min 5 min 0 min 5 min min min 40 s 0 s 0 s 5 s 0 s ig. 5 s s s 0A 0A Ic Ir 80A Ioc Is 00A 0A 0 480A 00A 800A 000A 00A 00A 000A 400A 00A 4000A 4800A 000A 8000A 80 0 08 80 40 0 lp 00 0 R400 / R400D Rollarc contactor 9
Operating mechanism and equipment Rollarc operating mechanism The contactor is closed by an electromagnet (pick-up coil Y). c for the magnetically held contactor R400, two seal-in coils (YM) are inserted in the circuit at the end of closing. The contactor is tripped by the opening of the holding circuit. c for the mechanically latched contactor R400D, the contactor is held in closed position by the mechanical latching system. The contactor is tripped by a shunt trip which releases the latching device. Auxiliary switches Rollarc contactors are equipped with ten changeover common point auxiliary switches. onsult the equipment selection table for information on the number of available switches. Optional pressure switch. The optional pressure switch for alamr indications closes a changeover switch if the gas pressure drop below.5 bars. ontact breaking capacity: c A.. (p.f. = 0.). A at 7V c D.. 0.5A at 0V - 0.4A at 0V selection of code R400 magnetically held contactor R400D mechanically latched contactor accessories basic fixed withdrawable basic fixed withdrawable version version version version version version A/D A/D A/D A/D A/D A/D closing electromagnet Y c c c c c c holding electromagnet (seal-in) YM c c c shunt trip YD c c c number of auxiliary switches A 9 9 9 8 8 8 switches available () pressrure switch P v v v v v v anti-pumping relay KN c c closing relay KM c c c c opening relay KMO c c c c operation counter () P v v v v interlocking auxiliary switch ( * ) SE c c c c interlock v v v v «service position» indication SQ c c equipment for M.V fuses v v v v (fixing and «fuse blown» contacts withdrawable fixed frame () v v 75kV kit v v mechanical interlock v v () the operations counter uses one auxiliary switch () device may be padlocked on the fixed frame ( or padlocks) (*) the interlock switch is actuated by the operating handle c v standard equipement relay not supplied, wired by user (see diagrams) optional accessories 0 R400 / R400D Rollarc contactor
Principle diagram Rollarc 400 basic version Indication ontrol Power Y YM 00 0 0 0 40 4 50 5 0 0 70 7 80 8 90 9 SQ 0 4 5 7 8 9 P.5 bar + UBT 7 UBT 5 4 7 KMO KM for D power supply for A power supply P 00 4 S S5 S Rollarc 400D basic version Indication ontrol Power Y YM YD 00 0 0 0 40 4 50 5 0 0 70 7 80 8 90 9 SQ 0 4 5 7 8 9 P.5 bar + UBT 7 UBT 5 4 7 KN KMO KM for D power supply for A power supply P 00 4 S S5 S : standard Schneider supply : control relay recommended by Schneider : options proposed by Schneider 4: O/ control unit (not supplied by Schneider) mechanical links Rollarc printed circuit alone connections supplied connections not supplied Y: closing coils a : 050 W c 900VA YM: seal-in coil a : 0 W c 40VA YD: shunt trip a : 80 W c 00VA SQ: limit switch. Seal-in coil contact : capacitor = Iµf x U max = 50V : Resistance R =.KΩ : Varistor U rms = 50V type : GE Mov UBT : low voltage fuse Un (V) 48 0-7 00-7 0-50 Ia (A) 0.5.5.5 Q: auxiliary switch Ia = 0A Breaking I c (p.f. = 0.) 0A/0V a (L/R = 0.5) 0.5A/0V P: pressure switch closing (S-S) c.a/0v a 0.4A/0V : opening push button S: closing push button P: -digit operations counter KN: end of closing relay KM: closing relay KMO: opening relay see table below Un (V) 48 0 0 Ia (A) z 0 0 0 p.f. = 0.4 c (A). 0.4 0.4 L/R = 40 ms a (A) 0.8 0. 0. 8 oil consumption a W c 4VA R400 / R400D Rollarc contactor
Principle diagram Rollarc 400 fixed version with electrical auxiliaries Indication ontrol Power S S8 S S5 S4 S S5 S8 S0 S4 S S4 S9 S S 4 007 S7 007 Q Y YM 00 0 0 0 40 4 50 5 0 0 70 7 80 8 90 9 9 SQ 0 4 5 7 8 9 P.5 bar S S7 S9 S S S5 + UBT 7 5 UBT 4 7 009 009 SQE KM 00 005 00 005 00 KMO UMT for D power supply SE for A power supply 8 5 P 00 0 4 S S0 S9 S S7 S S S5 S0 S Rollarc 400D fixed version with electrical auxiliaries Indication ontrol Power S S S8 S S5 S4 S S5 S8 S0 S4 S S4 S9 S S 9 4 007 S7 007 Q Y YM YD 00 0 0 0 40 4 50 5 0 0 70 7 80 8 90 9 SQ 0 4 5 7 8 9 P.5 bar S S7 S9 S S S5 + UBT 7 5 UBT 4 7 009 009 00 00 KN SQE KM KMO 00 005 00 005 00 UMT for D power supply SE for A power supply 8 5 P 00 0 4 S S4 S0 S9 S S7 S S S5 S0 S : standard Schneider supply : options proposed by Schneider 4: O/ control unit (not supplied by Schneider) mechanical links Rollarc printed circuit alone connections supplied connections not supplied : mechanical locking. ontactor open. aution: do not connect S or 8 (emergency opening) Y: closing coil a : 050 W c 900VA YM: seal-in coil a : 0 W c 40VA YD: shunt trip a : 80 W c 00VA SQ: limit switch. Seal-in coil contact : capacitor = Iµf x U max = 50V : Resistance R =.KΩ : Varistor U rms = 50V type : GE Mov UBT: low voltage fuse Un (V) 48 0-7 00-7 0-50 Ia (A) 0.5.5.5 Q: auxiliary switch Ia = 0A Breaking I c (p.f. = 0.) 0A/0V a (L/R = 0.5) 0.5A/0V P: pressure switch closing (S-S) c,a/0v a 0,4A/0V SQE: open/contactor locked open mechanically SQE: closed/contactor locked open mechanically opening command maintained : opening push button S: closing push button P: -digit operations counter UMT: HV fuse. See document A0479 (usarc type fuse) SE: contactor position lock A/0 V KN: end of closing relay KM: closing relay see table below KMO: opening relay Un (V) 48 0 0 Ia (A) z 0 0 0 p.f. = 0,4 c (A). 0.4 0.4 L/R = 40 ms a (A) 0.8 0. 0.8 oil consumption a W c 4VA R400 / R400D Rollarc contactor
Rollarc 400 withdrawable version with electrical auxiliaries Indication ontrol Power S S S8 S S5 S4 S S5 S8 S0 S4 S S4 S9 S S 4 007 S7 007 Q Y YM 00 0 0 0 40 4 50 5 0 0 70 7 80 8 90 9 SQ 0 4 5 7 8 9 P.5 bar S S7 S9 S S S5 + UBT 7 5 UBT 4 7 009 009 SQE SQE KM SQ KMO 00 005 00 005 00 UMT for D power supply SE for A power supply 8 5 P 00 0 4 S S7 S8 S0 S9 S S7 S S S5 S0 S Rollarc 400D withdrawable version with electrical auxiliaries Indication ontrol Power S S S S8 S S5 S4 S S5 S8 S0 S4 S S4 S9 S S 9 4 007 S7 007 Q Y YM YD 00 0 0 0 40 4 50 5 0 0 70 7 80 8 90 9 SQ 0 4 5 7 8 9 P.5 bar S S7 S9 S S S5 + UBT 7 5 UBT 4 7 009 009 00 00 KN SQE SQE KM SQ KMO 00 005 00 005 00 UMT for D power supply SE for A power supply 8 5 P 00 0 4 S S4 S7 S8 S0 S9 S S7 S S S5 S0 S : standard Schneider supply : options proposed by Schneider 4: O/ control unit (not supplied by Schneider) mechanical links Rollarc printed circuit alone connections supplied connections not supplied : mechanical locking. ontactor open. aution: do not connect S or 8 (emergency opening) Y: closing coil a : 050 W c 900VA YM: seal-in coil a : 0 W c 40VA YD: shunt trip a : 80 W c 00VA SQ: limit switch. Seal-in coil contact : capacitor = Iµf x U max = 50V : Resistance R =.KΩ : Varistor U rms = 50V type : GE Mov UBT: low voltage fuse Un (V) 48 0-7 00-7 0-50 Ia (A) 0.5.5.5 Q: auxiliary switch Ia = 0A Breaking I c (p.f. = 0.) 0A/0V a (L/R = 0.5) 0.5A/0V P: pressure switch closing (S-S) c,a/0v a 0,4A/0V SQE: open/contactor locked open mechanically SQE: closed/contactor locked open mechanically opening command maintained : opening push button S: closing push button P: -digit operations counter SQ: service position indication UMT: HV fuse. See document A0479 (usarc type fuse) SE: contactor position lock A/0 V KN: end of closing relay KM: closing relay see table below KMO: opening relay Un (V) 48 0 0 Ia (A) z 0 0 0 p.f. = 0,4 c (A). 0.4 0.4 L/R = 40 ms a (A) 0.8 0. 0.8 oil consumption a W c 4VA R400 / R400D Rollarc contactor
Dimensions Basic version 7 () mounting dimensions approximative weight: 5 kg 50 8 0 () 4 5 0 () 07 07 ØM0 7 9 5 4 8 ixed version 50 50 88 e = 9 a: LV connector () mounting dimensions approximative weight: 5 kg 5x 500 70 Ø9 a 8 5 4 () 47 400 () 70 Withdrawable version 50 50 95 e = 9 a: LV connector () mounting dimensions approximative weight: 85 kg 5x 500 70 Ø9 a 454 () 8 490 74 5 7 400 () 5 40 4 R400 / R400D Rollarc contactor
Installation examples Withdrawable Mset factory-built cubicle See technical sheet A 047E SM factory-built cubicle See technical sheet A 05E R400 / R400D Rollarc contactor 5
S gas properties and Rollarc technique Advantages of Rollarc S The Rollarc rotating arc contactor is a modern device with enhanced cooling of the arc by forced convection leading to the following advantages: Long life This results from: c high product reliability, c very low wear of the active parts which require no maintenance, c the excellent sealing of the enclosure, eliminating the need for subsequent filling. Mechanical endurance The operating energy is reduced because arc rotation is directly created by the current to be interrupted. The Rollarc contactor can do 00 000 operations in R400 version and 00 000 operations in R400D version. Sulphur hexafluoride (S) gas properties S is a non-inflammable very stable, non- toxic gas, five times heavier than air. Its dielectric strength is much higher than that of air at atmospheric pressure. Gas for interruption S is "the" arc-interruption gas, combining the best properties: c high capacity for carrying away the heat produced by the arc. The latter is rapidly cooled by convection during the arcing period. c high radial thermal conduction and high electron capturing capacity. When the current passes through zero, the arc is extinguished by the combination of two phenomena: v S permits rapid heat exchange from the center of the arc toward the exterior. v fluorine atoms, which are highly electronegative, act as veritable "traps" for electrons. Since it is electrons which are mainly responsible for electric conduction in the gas, the gap between the contacts recovers its initial dielectric strength through this electron capture phenomenon at zero current. c the decomposition of the S molecule is reversible. The same mass of gas is therefore always available, making the device self-sustained throughout its operating life. Electrical endurance The long life of the Rollarc is due to the negligible degeneration of the gas and to low wear of the contacts. The energy dissipated in the arc is low due to: c the intrinsic properties of the gas, c the short length of the arc, c the very short arcing time. Wear of the arcing contacts can be checked without opening the poles. The unit is capable of breaking all load and short-circuit currents, even in the case of frequent operation. With very high breaking capacity for a contactor, the Rollarc can be used in a fuse-contactor assembly capable of protecting any circuit against all types of faults including overloads. Low switching surges The intrinsic properties of the gas and the soft break resulting from this technique means that switching surges are very low. oncerning motor start-up, the unit is free from multiple prestrike and restrike phenomena which could damage the winding insulation. Operating safety The Rollarc contactor operates at a low relative pressure of.5 bars. ontinuous monitoring of the contactor pressure (optional) A pressure switch actuates a contact in the event of an accidental drop in the pressure of the S gas in the Rollarc unit. Insensitivity to external conditions The Rollarc pole unit provides a totally gas-insulated system. It is a hermetically sealed enclosure filled with S gas and housing the essential parts. Rollarc is particularly suited to polluted environments such as mines, cement works, etc. R400 / R400D Rollarc contactor
The rotating arc technique The rotating arc principle The exceptional characteristics of S gas are used to extinguish the electrical arc. ooling is enhanced by the relative movement between the arc and the gas. In the rotating arc technique, the arc is set in motion between two circular arcing contacts (see figure opposite). When the main contacts separate, the current to be interrupted flows through a solenoid, thus creating an electromagnetic field B. When the arcing contacts separate, the arc appears between them. The arc is made to rotate between the two circular arcing contacts by force, the combined result of the electromagnetic field and the current. orce is directly proportional to the square of the current to be interrupted. This breaking technique therefore automatically adapts to the current to be interrupted. When the current is high, the speed of rotation is high (speed of sound) and cooling is intense. Just before reaching zero current, the speed is still sufficient to make the arc rotate and thus contribute to the recovery of dielectric strength at zero current. Wear of the arcing contacts is very low. When the current is low, the speed of rotation is also low. This leads to very soft breaking of the arc without surges, comparable to the widely appreciated performances of the air breaking technique. I I B R400 / R400D Rollarc contactor 7
Soft breaking Breaking of inductive or capacitive currents The Rollarc contactor does not generate voltage surges. On some switchgear such surges occur during the breaking of low inductive or capacitive currents and can damage the insulation of connected devices. With the rotating arc technique, the rotation speed of the arc is low for low currents and breaking is soft under all conditions. c current chopping: (arc interruption before zero current) the chopping current is always less than A, i.e. the voltage surge is very low for the load. c multiple prestrikes and restrikes Other phenomena exist that are much more dangerous to the load than the voltage surges resulting from current chopping. Such phenomena occur if the device tries to break high frequency currents. High frequency currents appear when there is a dielectric breakdown (opening of contacts is too close to zero current) and produce high frequency waves that are very dangerous for motor insulation. Given the relatively slow dielectric regeneration between its arcing contacts, the Rollarc contactor avoids breaking high frequency currents and multiple prestrike and restrike phenomena are prevented. The Rollarc is thus the perfect motor control contactor. It provides the user and the network with total security without requiring additional accessories such as surge arresters or R systems. Results of tests on Rollarc motor starting busbar busbar capacitance and overvoltage Pu () multiple current capacitance (b) compensation (b+c) average standard maxi restrikes deviation 00A 0.05 m.7 0.8.5 none 00A.8 m.88 0.. none 00A 0.05 m.9 0.0.90 none 00A.8 m.79 0.09.9 none () Pu = measured peak voltage U Example: peak voltage 7. x.7 U = 0.5 kv Test circuit diagram 00A 7. kv and 00A 7. kv Source U Busbar representation Tested device onnection Motor substitute circuit Ls L R c tests according to IE draft standard (7A secretariat 9) Overvoltage levels depend on the breaking device, and also on the circuit. The IE standard proposes a standard motor breaking circuit. Ze b or b + c Rp p Ze earth impedance Ls power supply inductance U power supply voltage c compensation capacitance b capacitance of the bars Lb inductance of the bars L load inductance R load resistance p load parallel capacitance Rp load parallel resistance 8 R400 / R400D Rollarc contactor
Rollard pole units 5 7 9 4 8 0 Description Each pole unit consists of: c a main circuit composed of a fixed main contact (4) and a moving main contact () c a breaking circuit composed of a fixed arcing contact (5) and a moving arcing contact (7) that form two circular runners. A blowout coil () is mounted in series in the circuit. The main circuit that ensures the flow of the current is distinct from the breaking circuit in which the arc is produced. c a transmission mechanism for the transfer of energy from the operating mechanism to the mobile contacts.. MV terminals. Electromagnet. Blowout coil 4. ixed main contact 5. ixed arcing contact. Moving main contact 7. Moving arcing contact 8. Sealing bellows 9. lexible connector 0. Enclosure. Molecular sieve Operation fig. fig. Rollarc 400 is a magnetic device that uses the rotating arc technique to interrupt the current. c at the beginning of an opening cycle, the main contacts and the arcing contacts are closed (fig.). c isolation of the main circuit is achieved by the separation of the main contacts (fig. ). The arcing contacts are still closed. The current flows through the coil, the arcing contacts and the flexible connector. c the arcing contacts open shortly after the main contacts. The resulting arc is made to rotate between the two circular runners of the arcing contacts by the electromagnetic field produced by the coil, the force of which depends on the current to be interrupted (fig. ). By design and due to phase shift between the current and the electromagnetic field, this force is still significant at zero current. c at zero current, the gap between the contacts recovers its initial dielectric strength thanks to the inherent qualities of S gas (fig. 4). fig. fig. 4 R400 / R400D Rollarc contactor 9
use-contactor assembly Utilisation guide use-contactor combinations Principle The contactor switches the load on and off during normal operation or an overload. The fuse ensures correct interruption of short-circuit currents according to the network short-circuit level. A "fuse-blown" device causes contactor opening. Economic advantages or a short-circuit level of 500 MVA, or of 50 ka at kv, the saving in switchgear costs is more than 50 % compared to a circuit breaker solution. Limited interrupted current Prospective current Technical advantages ontactor: high switching rates and greater mechanical endurance than a circuit breaker. use: current limitation that considerably reduces the thermal and electrodynamic effects of a fault (fig. ). use-contactor assembly Transformer control and protection Select the fuse using the table below Selection table (ratings in A) () service type of transformer rating (kva) voltage (kv) fuse 5 50 00 5 0 00 50 5 400 500 0 800 000 50 00 usarc 5 50 50 80 80 5 5 5 0 00 50. 5 40 50 50 80 80 00 00 5 0 00 50 5.5 0.5.5 40 50 50 80 00 5 5 0 00 0 5.5 40 50 50 80 80 5 5 5 0 00. 0 5.5 40 50 50 80 80 00 5 5 0 00 0. 0 0 5.5 40 50 50 80 80 00 00 () Installation without transformer overload 0 R400 / R400D Rollarc contactor
use-contactor assembly motor control The three sets of curves below enable the user to determine fuse ratings according to the motor power rating (P in kw) and its rated voltage (U in kv). c set : provides the rated current in (A) using P and U c set : provides the starting current Is (A) using In c set : provides the correct fuse rating according to Is and the starting time ts (s). use rating use ratings are determined according to three parameters depending on the motor characteristics: c starting current c duration of start c switching rate Id(A) 00 0 00 000 0000 00 Motor protection The usarc fuse in association with a Rollarc contactor constitutes a particularly effective protection device for MV motors. Td(s) 0 50A x50a x00a 50A 00A D 0 A 80A 0A 50kW 5A 00 P(kW) 000 0000 00A 000A 0 0 In(A) kv 0kV x x0 x8 x 00,kV kv 5,5kV A B 7A x4 00 4,kV,kV kv 000 00 000 0000 0 00 000 000 0000 Example A 50 kw motor supplied at. kv (point A) has a rated current In of 7 A (point B) ; c the starting current is six times greater than the rated current, i.e. 000 A (point ) ; c for a ten second starting time ts, the third set of curves indicates a rating of 50 A (point D). Remarks c curve set is plotted for a power factor (p.f.) of 0.9 and an output efficiency of 0.94. or different values, use the formula: In = P n Un p.f. c the curves in set are plotted for six starts spaced over one hour or two consecutive starts. or n starts spaced over one hour (n>), multiply ts by p p or p consecutive starts (p>), multiply ts by (see selection table) If the start duration information is not known, use ts = 0 s. c if motor start-up is not direct, the fuse rating obtained using the curves above may be insufficient for the full load current of the motor. A rating 0 % higher than the full load current should be selected to take into account installation in a cubicle. R400 / R400D Rollarc contactor