Technical Data. Low Voltage Regulation System LVRSys. Flexible solution for power utilities. Voltage stabilization for industrial grids
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1 Technical Data Low Voltage Regulation System LVRSys 1 Power range: 7.5 kva up to 3150 kva 1 Regulation: single- or three-phase 1 Regulation ranges: ± 6 % to ± 24 % 1 Overall efficiency: 99.4 % to 99.8 % 1 Noise level: 25 to 37 db(a) 1 Phase independent regulation 1 No grid interference 1 Increase of the single phase short circuit power Flexible solution for power utilities The low voltage regulation system LVRSys represents a cost-effective alternative to grid expansion. The economic use is recommended in all low voltage grids, where short-circuit power is sufficient, but when they have voltage maintenance problems. Voltage maintenance problems can occur locally (in single lines) or at the level of the entire low voltage grid. LVRSys systems can be used with flexibility as line regulator or as direct regulator on the local grid. Voltage stabilization for industrial grids The EN describes the voltage quality, which must be between tolerance limits. The tolerance limits are ± 10% of the rated voltage U N (400 V L-L). This corresponds to a voltage band around the U N of 80 V. Machines, drives and lighting devices operating most efficient when the voltage is at the operating point. As a rule, the optimum operating point is the rated voltage of the network. Outside this operating point, the efficiency and lifetime of the equipment decreases. Especially lighting equipment, such as LEDs, loses their operating lifetime with increasing voltage. Especially for industrial applications, the LVRSys reaction time can be configured with less than 30 ms. Voltage profile of a grid branch without and with LVRSys Edition 06/2018 g
2 We take care of it. Operation The principle of the LVRSys control is of a linear regulator. By switching two transformers with selected transfer ratios on and off, it is possible to regulate the output voltage in 9 steps. Unregulated input voltage Transformer 4.5% Control unit Transformer 1.5% Example of 3 % voltage reduction Regulated output voltage The thyristors are switched intelligently and avoid thus any current surges, voltage dips and harmonics. Step Transformer 1.5% Transformer 4.5% +6 % +1.5 % +4.5 % +4.5 % 0 % +4.5 % +3 % -1.5 % +4.5 % +1.5 % +1.5 % 0 % 0 % 0 % 0 % -1.5 % -1.5 % 0 % -3 % +1.5 % -4.5 % -4.5 %/ 0 % -4.5 % -6 % -1.5 % -4.5 % Generation of the voltage levels in 9 steps, e. g. 6 % system Regulation parameters 1 Set point (voltage value, 3-phase) 1 Tolerance band + (Upper limit value of the tolerance area) 1 Tolerance band - (Lower limit value of the tolerance area) 1 Reaction time 1 Line drop compensation (grid impedance) 1 Balancing of the 3-phase voltages within the tolerance area Tolerance area Line drop compensation The reference voltage value is calculated from the current measurement and the grid impedance. The regulation can thereby be optimized without additional communication devices. In the load scenario the calculated voltage value is reduced. In the feed-in scenario, the calculated voltage value is increased. ONT 0.4kV KV LVRSys 250 m PV Einspeisung Example: Cable line with 250 m between LVRSys and PV feed-in In this line a PV system feeds current into the grid. The grid impedance regulation calculates the voltage drop of the cable in addition to the measured voltage. The LVRSys regulates now the voltage at the end of the cable into the tolerance bands. The tolerance area is widened and the voltage at the selected point in the grid is regulated. Page 2
3 Balancing of the three-phase voltage The phase-independent regulation enables the balancing of the three-phase voltages and thus improves the power quality of the grid. Three-phase loads, such as motors, operate with a symmetrical voltage more efficiently and have a longer product lifecycle. Perfect scaling for the low voltage grid Power classes from 22 kva to 630 kva (3-phase) or 7.5 to 35 kva (1-phase) are available for the low-voltage grid. Possible application locations of LVRSys Increase the single-phase short-circuit power Single-pole short-circuit power without LVRSys + preliminary stage (left) / with LVRSys + preliminary stage (right) At the end of very long cables the single-phase shortcircuit power is very low. The triggering criteria of the fuses cannot be fulfilled in case of a single-phase short-circuit. The LVRSys in combination with a preliminary stage increases the short-circuit power by approx. 65 %. Through this grid expansion caused by low shortcircuit power can be avoided. Page 3
4 We take care of it. LVRSys flexible and robust for every application Robust 1 Twenty billions of switches 1 Short circuit proofed up to 50 ka 1 High resistance to over voltages, direct and indirect lightning strikes 1 Overloading (as NH-fuse) Grid compatibility 1 No grid interference, causes no flicker or harmonics 1 Balancing of the voltage via phase-independent regulation 1 Existing fuse concept can be maintained 1 Interruption-free power supply guaranteed (Automatic Bypass) Intuitive and secure 1 Installation as a cable distribution cabinet 1 Common connection via NH-fuse-switch-disconnector 1 Commissioning via NH-fuse-switch-disconnector or circuit breakers 1 Fully encapsulated system for maximum touch protection Reliable and economical 1 High efficiency 1 Passive cooling even in direct sunlight 1 Operation temperature -40 C up to +50 C ambient temperature 1 Electronics moisture-proof housed in the internal control cabinet (IP66) Flexible and fast 1 Adjustable response time of the controller < 30 ms up to 100 s 1 Adaption of the control algorithms to different applications 1 Line drop compensation, without additional communication 1 Independent tolerance bands Easy 1 Data export via USB-Stick into e. g. MS Excel 1 Firmware update via USB-Stick or SCADA Systems 1 Common communication interfaces Modbus TCP, IEC Drag indicator in the Display Page 4
5 Design and installation Grid operators of low voltage grids can choose from several housing variants: 1 GRP-housing + GRP base (up to 250 kva 8% size. 2 or size. 3) 1 Aluminium-housing + Concrete base (22 kva up to 630 kva) 1 Customer-specific housing (e.g. Concrete cabinets) 1 Pole Mount For indoor use, the control cabinets and base are made of steel. Standard-housing: Version in GRP or aluminium. Installation like a standard distribution cabinet. Connection via switch-disconnectors Customer-specific housing: Version in customer-specific housing. Installation like a standard distribution cabinet Connection via switch-disconnectors Pole mount Version in housing for pole mounting. Connection via terminals. Housing for indoor applications Version in modular system cabinets with small dimensions. Connection via terminals. Page 5
6 We take care of it. Technical data Rated data Rated voltage U N Rated current I N 3-phase/1-phase Rated frequency f N 400 V / 230 V ±20 % (L-L/LE) 3-phase 32 A (22 kva System) 63 A (44 kva System) 100 A (70 kva System) 160 A (110 kva System) 200 A (144 kva System) 250 A (175 kva System) 355 A (250 kva System) 577 A (400 kva System) 909 A (630 kva System) 50 Hz / 60 Hz Efficiency 99.4 % 99.8 % Maximum switching duration 30 ms Regulation ranges ± 6 % von U N in 9 steps á 1.5 % Operating temperature Maximum permitted air temperature in the switch cabinet Altitude of the installation (NN) ± 8 % von U N in 9 steps á 2.0 % ± 10 % von U N in 9 steps á 2.5 % 1-phase up to ± 24 % von U N (Special design) 32 A (7,5 kva System) 63 A (15 kva System) 100 A (25 kva System) 160 A (35 kva System) - 40 C up to + 40 C (up to + 50 C special design) 70 C < 2000 m Safety class IP44 - IP55/ Electronic IP 66 Max. power consumption of secondary electronics 200 ma (230 V) Short-circuit impedance u k ca. 0.3 % Cooling passive (convection via switch cabinet housing) Limits Rated impulse voltage U Imp Short time current resistance I cw (1 s) Rated conditional short-circuit current I cc Rated conditional short-circuit current I cf protected with fuses High rated peak withstand currents I pk 6 kv 5 ka (up to 70 kva) 15 ka (110 kva up to 630 kva) 20 ka (up to 70 kva) 50 ka (110 kva up to 630 kva) 3 ka (22 kva) 20 ka (175 kva) 5 ka (44 kva) 30 ka (250 kva) 10 ka (70 kva) 50 ka (400 kva) 14 ka (110 kva) 50 ka (630 kva) 16 ka (144 kva) 20 ka (up to 70 kva) 50 ka (110 up to 630 kva) Page 6
7 Measurements and weight Code Measurements cabinet B/T/H 80 cm/40 cm/135 cm B11 Aluminium cabinet for outdoor application 120 cm/40 cm/135 cm B cm/50 cm/145 cm (22 kva 400 kva) B cm/50 cm/155 cm (22 kva 630 kva) B14 GRP - Cabinet for outdoor application 113 cm/32 cm/113 cm B cm/32 cm/113 cm B42 Steel Cabinet for indoor application 60 cm/60 cm/160 cm B21 Pole Mount (three phase) 90 cm/60 cm/200 cm (144 kva 400 kva) B22 80 cm/30 cm/120 cm PM Weight cabinet 120 kg B11 Aluminium cabinet for outdoor application 165 kg B kg (22 kva 400 kva) B kg (22 kva 630 kva) B14 GRP - Cabinet for outdoor application 100 kg B kg B42 Steel Cabinet for indoor application 150 kg 200 kg B kg 700 kg (144 kva 400 kva) B22 Pole Mount (three phase) 110 kg 130 kg PM Measurement base B/T/H 80 cm/40 cm/100 cm C11 Concrete base 120 cm/40 cm/100 cm C cm/50 cm/100 cm (22 kva 400 kva) C cm/50 cm/100 cm (22 kva 630 kva) C14 GRP - Base 113 cm/32 cm/90 cm C cm/32 cm/90 cm C42 Steel Base 60 cm/60 cm/20 cm C21 90 cm/60 cm/20 cm (144 kva 400 kva) C22 Page 7
8 We take care of it. Weight concrete base (only outdoor applications) 200 kg 260 kg 280 kg 300 kg (22 kva 400 kva) (22 kva 630 kva) C11 C12 C13 C14 GRP - Base 30 kg 40 kg C41 C42 Steel Base for indoor application (pre-assembled) 5 kg 10 kg (144 kva 400 kva) C21 C22 Measurement transformer block B/T/H 3-phase (For indoor applications the transformer block is integrated in the cabinet) 40 cm/20 cm/ 85 cm 50 cm/22 cm/ 85 cm 70 cm/30 cm/ 95 cm 70 cm/39 cm/105 cm (144 kva 250 kva 8 %) (250 kva 10 % 400 kva) (630 kva) Weight transformer block 3-phase kg ( 22 kva) kg ( 44 kva) kg ( 70 kva) kg (110 kva) kg (144 kva) kg (175 kva) kg (250 kva) kg (400 kva) kg (630 kva) Directives EMC stability DIN EN EMC interference emission DIN EN Assembly instructions DIN EN /5 Low voltage directive 2014/35/EU Noise emissions < 37 db(a) A. Eberle GmbH & Co. KG Frankenstraße 160 D Nuremberg Phone: +49 (0) 911 / Fax: +49 (0) 911 / info@a-eberle.de Web: Edition of: 01/06/2018 Ver.: xxx_DB LVRSys_EVU_en_V_0_9 Copyright A. Eberle GmbH & Co. KG Subject to change without prior notice. Page 8
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