Novar NOVAR 300 Operation & Maintenance Manual Download Page 1

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2005

NOVAR 300

Capacitor Controller for

Power Factor Correction

Operation & Maintenance Manual

NOVAR_CM

Issue: March 2005

Summary of Contents for NOVAR 300

Page 1: ... 2005 NOVAR 300 Capacitor Controller for Power Factor Correction Operation Maintenance Manual NOVAR_CM Issue March 2005 ...

Page 2: ... of Calculation and C K Settings 18 3 5 SETTING OF TARGET COS PHI 19 3 6 CONNECTION ERRORS 20 3 7 USE OF EXPANDED DISPLAY 20 4 FAULT FINDING AND TEST PROCEDURES 22 4 1 FAULT FINDING 22 4 1 1 Connection error 22 4 1 2 Low system voltage 22 4 1 3 System current errors 22 4 1 4 Incompatible settings 22 4 1 5 Factory programmed settings 22 4 1 6 Input magnitude errors and transients 23 4 1 7 Internal ...

Page 3: ... utilities world wide apply financial penalties to industrial consumers of electrical energy when inductive loads are connected The established solution for compensating inductive loads is to apply power factor correction PFC by switching capacitors on to the system To optimise the operation of PFC and realise maximum benefits and cost savings a means of controlling the capacitor switching is nece...

Page 4: ...e 4 of 29 11 12 13 14 15 16 5 6 7 8 9 10 23 24 25 26 27 28 17 18 19 20 21 22 4 3 2 1 29 7 8 9 10 11 12 A B C 30 1 2 3 4 5 6 P1 S1 S2 P2 To Load Alarm if fitted For contact pairs fitted see number of stages FIGURE 1 Wiring diagram for volt free contacts ...

Page 5: ...5 of 29 4 3 2 1 29 A B C 30 11 12 13 14 15 16 4 5 6 P1 S1 S2 P2 To Load Alarm if fitted 5 6 7 8 9 10 1 2 3 Common 28 27 26 25 24 23 12 11 10 22 21 20 19 18 17 9 8 7 For contact pairs fitted see number of stages FIGURE 2 Wiring diagram for common contacts ...

Page 6: ...g the directional control button once Pressing this button once more places the Controller in the MANUAL off position and no further stages will be switched in or out Pressing this button once more will result in capacitor stages being removed until pressed again the three LED s associated with this button will at all times indicate the operational mode When capacitors are being connected a LED as...

Page 7: ... Temperature Range Storage 40 80 C Operating 10 55 C Settings c k 0 03 1 00 cos phi 0 80 1 00 0 95 leading Overload Ratings 1 5 x Vn for 10 seconds 2 x In continuously 20 x In for 3 seconds Isolation The controllers will withstand 2 kV rms 50 60 Hz for 1 minute between all terminals to case current terminals to all others voltage terminals to all others output contact pairs Volt Free versions Impu...

Page 8: ... implemented for all sequences on NOVAR 300 if requested Intelligent switching If twice the minimum capacitor size or more is required then the NOVAR will switch in a double step This applies for all sequences For sequence 00 1 1 1 1 the second capacitor will be connected after an additional delay of two seconds Limit selection Up to 12 plus alarm output The maximum possible for any configuration ...

Page 9: ...s the selected safety lockout time after the last manual mode operation Relevant manual mode operations are pressing the lower button and operation of an output relay Models without the automatic exit from manual are available Alarm output Signals failure to meet target cos ϕ See also Self Test Self Test At reset and every ten minutes in operation the NOVAR executes an internal hardware check for ...

Page 10: ...4 4 4 5 5 5 5 5 5 6 6 6 6 6 6 1 2 3 4 5 6 Capacitors connected Switching steps Time ROTATIONAL SYSTEM RESPONSE 1 1 1 1 1 1 2 2 2 2 2 2 3 3 3 3 3 3 4 4 4 4 4 5 5 5 6 1 2 3 4 5 6 Capacitors connected Switching steps Time LINEAR SYSTEM RESPONSE 1 2 1 3 2 1 2 1 1 FIGURE 3 Rotational linear capacitor switching ...

Page 11: ...nex 1 1 2 Conducted prEN50082 2 10 V rms modulated 80 A M 1kHz Immunity 1991 150 kHz to 29 MHz IEC 801 6 Burst Test IEC255 22 1 1 MHz burst disturbance test Class III 1988 2 5 kV common mode 1 kV differential mode C Conducted Emissions Limits 0 15 MHz to 0 5 MHz 66 56 dBµV Q P 56 46 dBµV Ave to EN55022 1987 Class B limits decrease linearly with log frequency 0 5 MHz to 5 MHz 56 dBµV Q P 46 dBµV Av...

Page 12: ...NOVAR is equal to or greater than that required for safe discharge of system capacitors Unless this has been specified on ordering the NOVAR will be set to 60 seconds If the system requires a greater time this must be set before powering up the NOVAR 3 1 SYSTEM CONNECTIONS Refer to Figures 1 and 2 The NOVAR power factor controllers employ solid state circuitry for the measurement of vars The vars ...

Page 13: ...Parameter Fascia Key Means of Selection Sequence G DIL switch Time G DIL switch Limit G DIL switch C k C Potentiometer cos ϕ D Potentiometer Warning Due to the presence of electrostatic sensitive devices on the printed circuit board care must be taken to effectively earth oneself before commencing commissioning The recommended method is to use a standard wrist strap that is connected to earth ...

Page 14: ...ntil lit display of energised stages B High definition liquid crystal display C C K setting D COS ϕ setting E Dual mode button auto manual F Dual mode button capacitor switching man and display selection auto G DIL switch sequence time and limit setting H Power on indication LED J Switching in progress circuit is capacitive K Switching in progress circuit is inductive 1 2 3 4 5 6 7 8 9 10 FIGURE 4...

Page 15: ...oller s sequence safety lockout time and limit of switching Note The settings can only be altered on site on the NOVAR 305 models Unless otherwise requested the NOVAR will have a sequence setting of 1 1 1 1 sequence 0 a safety lockout time of 60 seconds and a limit equal to the number of stages supplied with the unit Eight sequence settings are available The sequence controls the number of steps t...

Page 16: ...y Lockout Time Proper selection of switching time delay is a function of the electrical system and capacitor voltage rating Usually as a guide the time interval must be larger than the discharge time of the capacitor being switched This time required for discharge is known as the safety lockout time The dual in line switch should be set to the desired time by reference to Table 2 In expanded displ...

Page 17: ...h display digit Note The limit is the number of capacitors connected to the NOVAR and must be set correctly If the limit is set higher than the number of capacitors connected then the system response will be slowed down Table 3 Limit settings Stage Limit 1 2 3 4 5 6 7 8 9 10 11 12 Switch number 7 8 9 10 7 8 9 10 7 8 9 10 7 8 9 10 7 8 9 10 7 8 9 10 7 8 9 10 7 8 9 10 7 8 9 10 7 8 9 10 7 8 9 10 7 8 9...

Page 18: ...a single stage controller operating via a 200 5 CT but without a VT C 25 000 vars V 415 V I 200 A C k 25 000 5 3 415 200 0 87 The NOVAR 300 is scaled to give a deadband of 150 nominal capacitor size i e NOVAR 300 will switch capacitors in circuit when the input lagging vars exceed three quarters of a capacitor step size NOVAR 300 will switch capacitors out of circuit when the input leading vars ex...

Page 19: ...calings on the c k potentiometer will no longer be the actual capacitor starting current in amps This makes no difference to the operation of the unit The NOVAR 300 ratings must match the secondary rating of any CT and VT used 3 5 SETTING OF TARGET COS PHI This is set using the potentiometer labelled cos ϕ located on the front panel To make use of the expanded display mode the lower push button sh...

Page 20: ...he NOVAR will display 270 for a system at unity power factor If VBA is selected instead of VBC c then the NOVAR will display 150 If VCA is selected instead of VBC d then the NOVAR will display 210 The above values will change if the system is not at unity power factor e g if the system is at 40 lagging then a CT reversal would appear as 230 Because VAB or VAC are within the above stated bands then...

Page 21: ...NOVAR 300 Operation Maintenance Manual NOVAR_CM Page 21 of 29 VBC IA a VBC IA b VBA IA c VCA IA d VAB IA e VAC IA f FIGURE 7 System vector diagrams ...

Page 22: ...y incompatibilities in DIL switch settings c k and or target cos phi settings or an incomplete knowledge of how a particular NOVAR is programmed 4 1 4 1 If sequence 4 or 5 is selected it will not be possible under any circumstances to set the limit above 9 The same applies for sequences 6 and 7 the appropriate limits being 7 and 6 respectively 4 1 4 2 If the limit is set to 1 then the sequence wil...

Page 23: ...he case by either displaying CAL on its display or by alternating between this and its sign on display whilst flashing the IND LED briefly NB This is not an indication of a software error in the NOVAR it is impossible for a NOVAR to be despatched unless its software is correct If either of these situations does occur there will be some cause not caught by the above specific error traps e g voltage...

Page 24: ...lled in a panel The fastest time 10 second safety lockout giving a relay operation time of 2 seconds is with all three time switches set to 0 4 2 2 Test sequences WARNING IF INPUT CURRENT IS TAKEN FROM A CT THE TRANSFORMER SECONDARY SHOULD BE SHORT CIRCUITED BEFORE THE CONTROLLER INPUTS ARE DISCONNECTED 4 2 2 1 Connect the test voltage source to the controller inputs with the neutral connected to ...

Page 25: ... slowly The CAP LED should flash when the 10 input level is exceeded The controller should now start to count down 4 2 2 13 The setting of the c k potentiometer should be checked at several different levels by noting the inputs required to exceed the CAP and IND trip levels 4 2 2 14 If it is required to check operation of the Target Cos Phi potentiometer as well as the c k potentiometer it will be...

Page 26: ...age supply input terminals of the controller 5 1 2 Set the source to zero voltage and switch on 5 1 3 Slowly increase the voltage from zero to the rated value Ideally the process should extend over a period of five minutes 5 2 IN SERVICE Under normal operating conditions the controller requires little attention During routine servicing and inspection of the associated equipment the device should b...

Page 27: ...Remove the lockable cover its 2 keys and the tube of glue supplied from their packaging 5 3 2 Apply a thin line of adhesive to the bottom of the inside lip at the rear of the lockable cover 5 3 3 Remove the standard cover from the front of the NOVAR and place the lockable cover over the front of the NOVAR with the hinge placed towards the left of the NOVAR Press together firmly 5 3 4 Open the lock...

Page 28: ...am of the Controller This comprises two printed circuit boards with plugs and sockets providing all the board interconnections There are two versions of the Relay PCB circuit One for volt free contact versions and the other for common contact units These differ only in the connection of the relay output contacts ...

Page 29: ... 29 Display Driver LED Driver Display LEDs MICRO CONTROLLER Switch Select Switches C k and cos ϕ pots Scaling T2 CT Scaling Dropper Reset Circuits Relay Drivers Relays Power Supply To 5V Logic T1 VT Voltage Input Current Input FIGURE 8 NOVAR 300 Block diagram ...

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