Microprocessor Based Characteristics and adjustments

Transcription

1 Microprocessor Based Characteristics and adjustments 7- Range Operation Settings Operation and Examples 0 Ground Fault and Pre-rip larm LED ndication and OCR Controller ime/current Curves - OCR Checker 7

2 Range Characteristics he standard microprocessor based MCCB from erasaki has the most flexible characteristics on the European market. n addition to the standard overload and short circuit protection, there are a number of options available to meet specific applications. MCCB ype LD SD NS RMP PCK-UP ES P GF LEDs LEDs SPECL LED POR NERNL EXERNL H-NS XH0PE XS00SE-C, XS00SE XH00SE XS0SE-C, XS0SE XH0SE XS00SE XH00SE XS0SE XS00SE XS000NE XS00NE Standard Optional Not available Standard for all embreak Microprocessor MCCBs Legend pplication LD Long ime Delay : Overload protection, rue R.M.S. SD Short ime Delay : Short circuit protection and selectivity NS nstantaneous : Short circuit protection, fast acting t RMP : Provides easier grading with downstream fuses Standard for all embreak Microprocessor MCCBs Pick-up LED est Port : Lights on LD overload, flashes on P pick-up : Facility for NS- OCR checker for calibration checking P Pre-rip larm : Useful for loadshedding application GF Ground Fault rip : Protection against ground faults LEDS Light Emitting Diodes : ndication of fault for faster diagnosis H-NS High nstantaneous : High inrush applications, increased selectivity ccess to Setting Dials o adjust the settings on the microprocessor embreak, the sealed label must be broken and the covering fixing screws removed. o adjust the individual trip settings, turn the setting dial with a flat bladed screw driver. lign the setting required between the black dots marked on the dial. XS00SE Sealed label Spare sealing labels XS00SE (cover removed) Setting Dials

3 Operation Settings Standard ime Current Curves ime 0 L..D S..D Each part of the characteristic curve can be independently adjusted. his unique adjustability of LD, SD and NS enables the standard microprocessor MCCB to achieve more than 00,000 permutations of its time/current characteristic. his makes the embreak microprocessor range one of the most flexible on the market. o complement this range, erasaki have developed emcurve, selectivity analysis software which contains the full range of embreak MCCBs on database. his software package highlights the full benefit of having highly adjustable microprocessor MCCBs when involved with difficult selectivity problems. Please refer to page for more information. 0. NS. 00% of Standard Microprocessor djustments G G C RED CURREN n 0 ES N C BSE CUR x n CURR. SENG ME SENG PCK UP LONG ME SHOR ME NSNNEOUS x0 RED CUR. () 0 at x 0 x x 0 SHOR ME t at x 0 he t ramp switch, which is provided as standard, assists in discrimination with downstream fuses. With the switch off, the SD operates with a definite time characteristic: with the switch on, the characteristic alters to a ramp:, cutting off the corner which poses a potential selectivity problem. Setting Dial vailable djustments Base Current Setting x n mps LD Pick up x 0 mps LD Setting (at x 00%) Secs SD Pick up x 0 mps SD Setting Secs NS Pick up - x 0 (continuously adjustable) mps Note: special generator setting adjustment of - sec (at x 00%), and fixed high instantaneous () setting for high inrush/high selectivity are also available. Please contact erasaki for details.

4 Operation & Examples Overload djustment he rated current of the microprocessor based embreak is adjusted using two current multipliers. his process achieves high accuracy adjustment from 0% to 0%. hese are the LD pickup dial and the Base Current 0 selector switch. G CURR. SENG LONG ME SHOR ME NSNNEOUS he rated current (LD pickup) is achieved as follows: RED =n x 0 x n the example shown on the right the rating would be: RED =0 x x = 0 n total there are possible increments of adjustment between 0 and 0% as shown below. G C RED CURREN n 0 ES N BSE CUR. C 0 0. x n ME SENG PCK UP x0 RED CUR. () 0 at x 0 x x 0 SHOR ME t at x 0 Base current 0. x n 0 0 Current dial x0 Breaker rated current 7% in this example Example - Settings n the example shown on the right what are all the settings in mps? Solution RNG LD pickup = n x 0 x 0 x x = 00 SD pickup = n x 0 x 0 x x = 000 NS pickup = n x 0 x 0 x x =,000 GF pickup = n x G 0 x = (Note that GF is a function of n and not 0) G G C RED CURREN n 0 ES N BSE CUR. C 0 0. x n CURR. SENG ME SENG PCK UP LONG ME SHOR ME NSNNEOUS GROUND FUL x0 RED CUR. () 0 at x 0 x x 0 SHOR ME t at x 0 0. G G X n Example - ime/current Curves G.F.. L..D ime ime S..D =0msec G =0msec NS 0 =00 =000 =000 G =

5 Ground Fault & Pre rip larm Ground Fault djustments LONG ME SHOR ME NSNNEOUS GROUND FUL G CURR. SENG G C RED CURREN n 0 ES N BSE CUR. C 0 0. x n ME SENG PCK UP x0 RED CUR. () 0 at x 0 x x 0 SHOR ME t at x 0 0. G G X n G 0. G.F. G Setting Dial vailable djustments Percentage of n GF Pickup G to 0. continuously adjustable x n mps C GF Setting G seconds When a pole MCCB is used on a phase wire system a separate C is required for the neutral line. No control power is required for this option. M N H ØD CM MCCB Frame Size B C Ø D E F H CM M N W(kg) 0, , 00, 000, E F B Pre rip larm djustments G C RED CURREN n 0 ES N G CURR. SENG x0 RED CUR. () BSE CUR. 0 ME C 0 SENG 0 0. x n PCK UP LONG ME SHOR ME NSNNEOUS PRE RP LRM at x x x 0 SHOR ME t at x 0 Flickers on P pick-up 0.7 P x Note: C mounting base can be rotated by 0 P= 0 sec 0.7 P P.. Setting Dial vailable djustments Percentage of P Pickup P x mps P Setting P Fixed at 0 secs he P (Pre-rip larm) option continuously monitors the true r.m.s value of the load current. When the load current exceeds the preset current value P the pick-up led 'flashes' to provide a local alarm. f the current continues to exceed the P setting for 0 secs or more a volt free contact will close to provide a remote alarm. his volt free contact could also be used to trip non-essential load or start additional generator capacity. he volt free contact will only reset if the load current decreases to a value below P or the control voltage is interrupted. o operate the P function an OCR controller is required, this is supplied as standard with the option. Output Contact Normally open contact, (a) ntegral lead is standard length (0mm) Resistive load nductive load Rating of 0V C V ( max) 0V ( max) contact 0V C 0W ( max) W ( max) ripped indication Pick-up LED flickers

6 LED indication & OCR Controller LED ndication Faster Fault Diagnostics can be achieved through indication of fault type. On occurrence of a fault the relevant LED will light for that particular fault conditions. LED LD Fault ype Overload Reset button pushed to turn off the LED LED for LD tripped indication LED for SD/NS tripped indication LED for GF tripped indication SD/NS Short Circuit RESE RP NDCORS GF Earth Fault Pick-up his flashes for P pick-up and lights for LD pick-up G CURR. SENG LONG ME SHOR ME NSNNEOUS GROUND FUL On 0F and above the LED's are integral to the OCR. On breakers of below 0F, LED's are mounted on a block on the right hand side of the breaker. Please contact erasaki for details. G C RED CURREN n 0 ES N BSE CUR. C 0 0. x n ME SENG PCK UP x0 RED CUR. () 0 at x 0 x x 0 SHOR ME t at x 0 0. G G X n Flashes on P pick-up Example XS0NE OCR controller (P and trip indication) he OCR controller is installed in the left hand side of the breaker (standard). his can also be installed externally to the breaker (please specify when ordering). Note: nstallation position and accessory lead terminal block arrangements, refer to pages 7-7. OCR controller specifications Control power source 0-0 VC or 00-0 VC erminals OP and OP Consumption V Note: he permissible range of control power is -% of the rated voltage. OCR Controller connection diagram OCR controller mounted on the left hand side of the breaker OCR controller installed external to the breaker 0 OCR controller erminal screw M. OP OP OS OS ON OFF B ON Dimensions table (mm) red white OP OP OS OS OFF PL(c) PL(a) Lead wire (0mm long) P output contact, (a) Frame ype B () of Wtih UV Without UV MCCB controller controller 0 XH0PE 7 XS00SE-C 00 XS00SE 7 XH00SE XS0SE-C 0 XS0SE 0 XH0SE 00 XS00SE XH00SE 0 0 XS0SE 7 00 XS00SE 000 XS000NE 0 00 XS00NE 0

7 ime/current Curves ime/current characteristic curves XH0PE, XS00SE-C, XS00SE, XH00SE ime/current characteristic curves XS0SE-C, XS0SE, XH0SE, XS00SE, XH00SE ripping ime second minute hour P Curves based on standard settings ripping ime second minute hour P G G Curves based on standard settings Percent rated current of base current (0) Percent rated current of C rated current (n) Percent rated current of base current (0) Overcurrent tripping characteristics C rated current () (n) 0,00 Base current setting (): (o) (n) x (0.--) Long time-delay pick-up current (): () (o) x (----) Non-tripping at () setting x % and below. ripping at % and above. Long time-delay time settings (S) () ( 0 0) at () x 00% current. Setting tolerance ± 0% Short time-delay pick-up current (): () (o) x (----) Setting tolerance ± % Short time-delay time settings (S) () Opening time (,, 0., 0., 0.) in the definite time-delay. otal clearing time is + 0 ms and resettable time -0mS for the time-delay setting nstantaneous trip pick-up current () () Continuously adjustable from (o) x ( to) Setting tolerance ± 0% * Pre-trip alarm pick-up current () (P) () x (0.7,,, ) Setting tolerance ±% * Pre-trip alarm time setting (S) (P) 0 fixed definite time-delay.setting tolerance ±% Note: * Optional Note: he underlined values will be applied as standard ratings unless otherwise specified when ordering. Overcurrent tripping characteristics C rated current () (n) 0,00 Base current setting (): (o) (n) x (0.--) Long time-delay pick-up current (): () (o) x (----) Non-tripping at () setting x % and below. ripping at % & above. Long time-delay time settings (S) () ( 0 0) at () x 00% current. Setting tolerance ± 0% Short time-delay pick-up current (): () (o) x (----) Setting tolerance ± % Short time-delay time settings (S) () Opening time (,, 0., 0., 0.) in the definite time-delay. otal clearing time is + 0 ms and resettable time -0mS for the time-delay setting. nstantaneous trip pick-up current () () Continuously adjustable from (o) x ( to) Setting tolerance ± 0% * Pre-trip alarm pick-up current () (P) () x (0.7,,, ) Setting tolerance ±% * Pre-trip alarm time setting (S) (P) 0 fixed definite time-delay.setting tolerance ±% * Ground fault trip pick-up current (): (G) Continiuously adjustable from (n) x ( to 0.) Setting tolerance ± % * Ground fault trip time setting (S): (G) Opening time ( ) in the definite time-delay. otal clearing time is + 0mS and resettable time is - 0mS for the time-delay settings Note: * Optional Note: he underlined values will be applied as standard ratings unless otherwise specified when ordering.

8 ime/current Curves ime/current characteristic curves XS0SE, XS00SE, XS000NE, XS00NE ripping ime second minute hour P G G Curves based on standard settings. 0 0 Percent rated current of C rated current (n) Percent rated current of base current (0) Overcurrent tripping characteristics C rated current () (n) 00, 0, 00, 000, 00 Base current setting (): (o) (n) x (0.--) Long time-delay pick-up current (): () (o) x (----) Non-tripping at () setting x % and below. ripping at % & above. Long time-delay time settings (S) () ( 0 0) at () x 00% current. Setting tolerance ± 0% Short time-delay pick-up current (): () (o) x (----) Setting tolerance ± % Short time-delay time settings (S) () Opening time (,, 0., 0., 0.) in the definite time-delay. otal clearing time is + 0 ms and resettable time -0mS for the time-delay setting. nstantaneous trip pick-up current () () Continuously adjustable from (o) x ( to ) Setting tolerance ± 0% * Pre-trip alarm pick-up current () (P) () x (0.7,,, ) Setting tolerance ±% * Pre-trip alarm time setting (S) (P) 0 fixed definite time-delay.setting tolerance ±% * Ground fault trip pick-up current (): (G) Continiuously adjustable from (n) x ( to 0.) Setting tolerance ± % * Ground fault trip time setting (S): (G) Opening time ( ) in the definite time-delay. otal clearing time is + 0mS and resettable time is - 0mS for the time-delay settings Note: * Optional Note: he underlined values will be applied as standard ratings unless otherwise specified when ordering.

9 ime/current Curves Mathematical nalysis MCCB Curves microprocessor MCCB has three main regions on it s overcurrent tripping characteristic, namely Long ime Delay (LD) for overload protection, Short ime Delay (SD) and nstantaneous (NS), both for short-circuit protection. he following is an insight into how these curves interact and could act as a guide for hand-drawing the curves. emcurve Selectivity nalysis Software is available for computerised generation of curves (refer to page ). Firstly consider the following basic characteristic curve shown in figure. LD he LD takes the form of a curve and has the following characteristic equation: ( -). t = k where k is a constant. o determine k, the calibration point of the LD should be used, i.e. t = at = (00%). EC-7- states that a breaker must not trip below % of it s rated current, and always trip at 0% of it s rated current. erasaki microprocessor MCCBs however are calibrated to trip between % and %, giving them a higher degree of accuracy. f the middle point is taken then the pick-up of the MCCB is % of it s rated current. SD NS he SD and NS parts of the curve can be drawn more easily as they are simply a series of horizontal and vertical lines determined by the and settings for the SD, and setting for the NS. Example f we assume that we have: XS0SE with 0 C s and 0 =, =, = 0secs, =, = 0.secs and = 70secs = 0secs LD LD then the characteristic curve can be constructed as follows. o draw the LD we firstly need to determine the constant k, as follows: k = ( - ). t = ( - ). 0 = 0 giving the characteristic equation: ( -). t = 0 By simple arithmetic the tripping times for each level of overload can now be determined. % =0 00% =000 00% =000 For 00% overload (for the example this is equivalent to 0 x x x = 000). t = 0 = 0 = 70 secs ( - ) ( - ) he SD and NS can be constructed as follows with i = n x 0 x SD/NS i = n x 0 x SD = 0. s *Please note that 0ms is taken as an average time for the NS trip of the MCCB as it is the maximum time it will take the MCCB to trip. n practice the breaker will open much faster, particularly at high faults where the current limiting qualities of the MCCB become more effective. * 0ms NS i = nx 0x i = nx 0x = 0 x x = 0 x x = 000 = 000

10 OCR Checker, nspection and Maintenance OCR Checker he embreak (Electronic) OCR Checker, is a portable easy-to-use instrument for field testing the trip functions. t checks the pick-up current and tripping time values of the LD, SD, NS and GF functions. Ratings and Specifications Power Source 0~V C Single phase 0/0Hz NS- / 00~0V C Single phase 0/0Hz NS- / Power Consumption 0V pplication LD function check (Set current and trip time values) SD function check (Set current and trip time values) NS function check (Set current value) GF function check (Set current and trip time values) Measurement of set current values Display -digit digital display Range 0-00m Measurement of tripping time values Range seconds Outline Dimensions 00mm (W) x mm (H) x 0mm (D) Weight.7kg ccessories Power cord (-core with grounding pole.m one pc) Connecting cable m one pc.