Рower factor correction controllers, protection relays LSB

Generalities COMPENSATION OF REACTIVE POWER WITH FULLY AUTOMATIC RECOGNITIONANDMONITORINGOFCAPACITOR SIZE INTELLIGENT REGULATION ALGORITHM GUARANTEES THE BEST CHOICEOFCAPACITORSANDASHORTTIMETOREACH TARGET FOR COMMISSIONING OF REGULATION FUNCTION, THERE ARE NO SETTINGSNECESSARY

Reactive power compensation panels are used to reduce load in the electrical grid and to save costs. This is the reason, that there are special requirements for the control units of these compensation panels, the reactive power regulator.

The most important task for the reactive power regulator is to control the reliable termination of reactive power. This is reducing the costs for electrical energy. Cables, transformers, switch components and power distribution are unloaded by reduce reactive power.

Another task of the reactive power regulator is monitoring the compensation panel and giving alarms.

All of these requirements are solved by Beluk reactive power regulators with their patented regulation principle. By continuous measuring of the capacitor power, the steps are always used with their exact capacitor ratings. The regulation program is only defined by the choice of the capacitor sizes. There are no limitations and no settings for step sequence are necessary at BLR-CX. If BLR-CX cannot recognize anymore the function of a step e.g. caused by damaged capacitors, contactors or blown fuses, then it shows alarm. The integrated alarm relay with sign-of-life contact can forward this also to a control room.

FUNCTION

The intelligent regulation algorithm of Beluk switches the steps optimized and by this it guarantees short compensation times combined with the smallest amount of operations. The operating cycles are shared equally to all steps.

All relevant parameters for the regulation are set ex works in the way that in nearly all cases for BLR-CX no further adjustments are necessary to start the regulation. An optimization of the control mode of the compensation panel to the local conditions is still possible. Parameters can easily be changed, also during operation.

These settings can be done in two separate user menues. The “Start” menue contains only the settings, which can be necessary for commissioning, like nominal voltage, CT and VT ratio and the automatic correction of current and voltage connection.

These settings and furthers settings of the “Expert” menue are:

Measuring: nominal voltage, CT ratio, VT ratio, tolerance of voltage, connection Ph-Ph/Ph-N, phase-correction, autom. correction of connection, synchronisation, reset operating hours, reset average PF, reset max. temperature, temperature offset

Regulation: sensitivity, target-cosphi 1 and 2, switch interval, delay step exchange, stepexchange, autom. capacitorsize detection, blocking of defective steps, Regul.progr.: Best-Fit, LIFO, combi, progressiv, Offset reactive power, asymmetric switch interval, avoid leading power factor

Steps: discharging time, step size in kvar, steptype (e.g. fix-steps)

Alarming: regulation alarm, defective step alarm, power loss of capacitors, THD U Alarm, overtemperature, limit switching operations, limit operating hours of panel, limit temp1/temp2 I=0 freeze regulation, etc.

To start regulation, only the correct setting of nominal voltage is necessary. Otherwise regulation is blocked for protecting capacitors. If CT ratio is not set, then measurement readings which depend on current are blanked.Awrong connection can be corrected by starting the automatic phase correction. For maintenance work, each individual step can be switched manually.

TECHNICAL DATA

Type of Device:	Reactive power regulator
Control Variable:	Electrical displacement reactive power
Priciple of Regulation:	Gradational regulation with the following modes: - Best-Fit: starting with the biggest suitable capacitor - LIFO: last in-first out - Combifilter: Best-Fit, with more connected reactive power of odd outputs - Progressive: all required outputs are switched in quasi one operation
Special Features:	- Automatic detection and correction of the phase of current and voltage connection - Automatic detection of the engaged outputs - Automatic detection and adaption of the capacitor ratings - Over- and undervoltage monitoring - Monitoring of THD U - Overtemperature switch-off
Measuring Display:	V, A, kVA, kW, kvar, cosphi, PF, kvar, THD U, 3rd to 19th harmonic of voltage
Information Display:	Switch cycles per step, capacitor rating, status of the exits, operating hours of the panel, max.temperature, average PF
Measuring- and Auxiliary Voltage:	90- 550V AC, single phase, 45-65HZ, 5VA, max. fuse 6A, VT ratio from 1,0 to 350,0
Current Measuring:	15mA -6A, single phase, burden 20mOhm, CT ratio from 1 to 9600
Control Outputs:	Upto 14 relay, N/O, voltfree with common point, max. fuse 6A, breaking capacity: 250V AC / 5A
Temperature measuring:	By NTC
Sign-Of-Life contact:	Relay, voltfree, N/O, max. fuse 4A, breaking capacity: 250V AC / 5A
Fan Control:	By using a control output
Interface:	TTL, rear
Ambient Temperature:	Operation: -20°C-70°C, storage: -20°C-80°C
Humidity:	0% - 98%, without moisture condensation
Overvoltage class:	II, pollution degree 3 (DIN VDE 0110, part 1 / IEC60664-1)
Standards:	DIN VDE 0110-1 (IEC 60664-1:1992 +A1:2000 +A2:2002) VDE 0411-1 (DIN EN 61010-1 / IEC 61010-1:2001) VDE 0843-20-1:2006 (DIN EN 61326-1:2006 / IEC 61326-1: 2005)
Terminals:	Plugable terminal blocks, screw type, max. 4qmm
Casing:	Front: instrument casing plastic (UL94-VO),
Rear:	metal
Protection Class:	Front: IP50, (IP54 by using a gasket between relay and panel)
Rear:	Ip20
Weight:	approx. 0,6kg
Dimensions:	144x144x58mm hxwxd, cutout 138 (+0,5) x 138 (+0,5)mm