OVERVOLTAGE PROTECTIONS FOR PHOTOVOLTAIC SYSTEMS

Transcription

1 OVERVOLTAGE PROTECTIOS FOR PHOTOVOLTAIC SYSTEMS, Combined lightning current and surge voltage arresters - tye 1 tye 2 - DC For rotection of electric networks and equiment against overvoltage from direct or indirect lightning strokes in the arresting equiment of buildings, LV lines etc. For rotection against overvoltage caused by atmosheric disturbances and from switching rocesses in networks. For rotection of arts of hotovoltaic sources mainly on their DC side. It reduces voltage and cut u the overvoltage wave ower caused by direct or indirect lightning stroke and or switching rocesses in the networks. Use: as the first stage and the second stage in rotection against overvoltage tye 1 and tye 2 according to E Combined lightning current and surge voltage arresters with removable module Surge voltage arresters intended for building, residential, commercial and other similar installations, art of which are DC alications (e.g. hotovoltaic source). Main comonents are varistors connected in Y. Possibility of mounting in casual emty enclosures and switchboard cabinets Distri. Design multiart, consisting of a base and relaceable modules. The modules can be removed in case of measurement or failure without necessity of device disconnection. Remote and visual signalling of the shut-down device state (after disconnection the surge voltage arrester is non-functional and the relaceable module must be relaced). Remote signalling of state is rovided in tye V-MZS. U CPV Design Tye Order umber Weight Package code of modules [kg] [cs] DC V without remote signalling -3V-MZ OEZ: with remote signalling -3V-MZS OEZ: DC 720 V without remote signalling V-MZ OEZ: with remote signalling V-MZS OEZ: Relaceable modules For device Sare Order umber of modules Weight Package module code in the device [kg] [cs] -3V-MZ(S) -V-M OEZ: V-MZ(S) -720-V-M OEZ: D21

2 OVERVOLTAGE PROTECTIOS FOR PHOTOVOLTAIC SYSTEMS, Surge voltage arresters - tye 2 - DC For rotection of electric networks and equiment against overvoltage from indirect lightning strokes. For rotection against overvoltage caused by atmosheric disturbances and from switching rocesses in networks. For rotection of arts of hotovoltaic sources mainly on their DC side. It reduces voltage and cut u the overvoltage wave ower caused by indirect lightning stroke and/or switching rocesses in the networks. Use: as the second stage in rotection against overvoltage tye 2 according to E For further information on OEZ offer for hotovoltaic systems see catalogue Protective and switching devices of hotovoltaic sources. Surge voltage arresters with removable module Surge voltage arresters intended for building, residential, commercial and other similar installations, art of which are DC alications (e.g. hotovoltaic source). Main comonents are varistors connected in Y. Possibility of mounting in casual emty enclosures and switchboard cabinets Distri. Design multiart, consisting of a base and relaceable modules. The modules can be removed in case of measurement or failure without necessity of device disconnection. Remote and visual signalling of the shut-down device state (after disconnection the surge voltage arrester is non-functional and the relaceable module must be relaced). Remote signalling of state is rovided in tye V-MZS. U CPV Design Tye Order umber Weight Package code of modules [kg] [cs] DC V without remote signalling V-MZ OEZ: with remote signalling V-MZS OEZ: DC 800 V without remote signalling V-MZ OEZ: with remote signalling V-MZS OEZ: Relaceable modules For device Sare Order umber of modules Weight Package module code in the device [kg] [cs] V-MZ(S) V-M OEZ: V-MZ(S) -800-V-M OEZ: D22

3 OVERVOLTAGE PROTECTIOS FOR PHOTOVOLTAIC SYSTEMS, Secifications Tye V-MZ V-MZS -3V-MZ -3V-MZS Standards E E E E Aroval marks Max. off -load voltage U UOCSTC DC 600 V DC 875 V Maximum constant oerating voltage U CPV DC 720 V DC V Rated loading current (V-connection) I L 80 A 80 A Max. short-circuit current (V-connection) I SCPV 300 A 300 A Imulse current (10/350 μs) I 5 ka 5 ka Rated discharge current (8/20 μs) I n Max. discharge current (8/20 μs) I max 40 ka 40 ka Voltage rotection level U, 2.6 kv 3.5 kv (/), 2.6 kv 3.5 kv Earth-leakage current I 20 μa 20 μa Still stand ower inut P C < 20 mva < 25 mva Arrester classification according to E tye 1 and tye 2 tye 1 and tye 2 Resonse time 25 ns 25 ns Degree of rotection IP20 IP20 Mounting on U rail according to E tye TH 35 TH 35 Connection Conductor - rigid (solid, stranded) mm mm 2 Conductor flexible mm mm 2 Torque 4.5 m 4.5 m To or bottom connection only bottom only bottom Otical signalling Functional state transarent transarent on-functional state red red Remote signalling Arrangement of contacts 1) Max. voltage/current U max/i max AC 250 V / 1.5 A AC 250 V / 1.5 A DC 30 V / 1 A DC 30 V / 1 A Min. switched ower AC 5 V / 5 ma AC 5 V / 5 ma Connection conductor (rigid, flexible) mm mm 2 Torque 0.25 m 0.25 m Oerating conditions Ambient temerature C C Working osition arbitrary arbitrary 1) Each digit indicates successively the number of make, break and break-make contacts. Dimensions Diagram V-MZ V-MZS D23

4 OVERVOLTAGE PROTECTIOS FOR PHOTOVOLTAIC SYSTEMS, Secifications Tye V-MZ V-MZS V-MZ V-MZS Standards E E E E Aroval marks Max. off -load voltage U UOCSTC DC 670 V DC 970 V Maximum constant oerating voltage U CPV DC 800 V DC V Rated loading current (V-connection) I L 80 A 80 A Max. short-circuit current (V-connection) I SCPV 300 A 300 A Rated discharge current (8/20 μs) I n Rated discharge current (8/20 μs) I max 40 ka 40 ka Voltage rotection level U, 2.7 kv 3.7 kv (/), 2.7 kv 3.7 kv Earth-leakage current I 20 μa 20 μa Still stand ower inut P C < 20 mva < 25 mva Arrester classification according to E tye 2 tye 2 Resonse time 25 ns 25 ns Degree of rotection IP20 IP20 Mounting on U rail according to E tye TH 35 TH 35 Connection Conductor - rigid (solid, stranded) mm mm 2 Conductor flexible mm mm 2 Torque 4.5 m 4.5 m To or bottom connection only bottom only bottom Otical signalling Functional state transarent transarent on-functional state red red Remote signalling Arrangement of contacts 1) Max. voltage/current U max/i max AC 250 V / 1 A AC 250 V / 1 A DC 30 V / 1 A DC 30 V / 1 A Min. switched ower AC 5 V / 5 ma AC 5 V / 5 ma Connection conductor (rigid, flexible) mm mm 2 Torque 0.25 m 0.25 m Oerating conditions Ambient temerature C C Working osition arbitrary arbitrary 1) Each digit indicates successively the number of make, break and break-make contacts. Dimensions Diagram V-MZ V-MZS D24

5 RECOMMEDATIOS FOR DESIG, ISTALLATIO AD MEASUREMET OF OVERVOLTAGE PROTECTIOS Conversion tables of former and new designs Tye 1 Tye 2 Tye 3 Formerly roduced devices ewly roduced devices Tye designation Order code Tye designation Order code ote SJBlus-50-1,5 OEZ:34715 SJBlus-50-2,5 OEZ:39227 adequate design SJBlus50/1,5 OEZ:14423 SJBlus-50-2,5 OEZ:39227 adequate design SJBlus-50 OEZ:34714 SJBlus-50-2,5 OEZ:39227 innovation - electronic ignition sark ga SJBlus50 OEZ:14424 SJBlus-50-2,5 OEZ:39227 innovation - electronic ignition sark ga SJBro-35-1,5 OEZ:34713 SJB-25E-3-MZS OEZ:38357 multiole design (30; T-C) SJB-25E-3-MZS OEZ:38358 multiole design (31; T-S, TT) SJBro35/1,5 OEZ:14422 SJB-25E-3-MZS OEZ:38357 multiole design (30; T-C) SJB-25E-3-MZS OEZ:38358 multiole design (31; T-S, TT) SJBro-35 OEZ:34712 SJB-25E-3-MZS OEZ:38357 multiole design (30; T-C) SJB-25E-3-MZS OEZ:38358 multiole design (31; T-S, TT) SJBro35 OEZ:13019 SJB-25E-3-MZS OEZ:38357 multiole design (30; T-C) SJB-25E-3-MZS OEZ:38358 multiole design (31; T-S, TT) SJB100//1,5 OEZ:14425 SJB--1,5 OEZ:34716 adequate design SVM440-Z OEZ:18565 SVM-440-Z OEZ:34720 adequate design SVM440-ZS OEZ:18566 SVM-440-ZS OEZ:34721 adequate design SVM-275-Z OEZ:34717 SVC MZ OEZ:38365 multiole design (30; T-C) SVC MZ OEZ:38367 multiole design (31; T-S, TT) SVM275-Z OEZ:13004 SVC MZ OEZ:38365 multiole design (30; T-C) SVC MZ OEZ:38367 multiole design (31; T-S, TT) SVM-275-ZS OEZ:34718 SVC MZS OEZ:38366 multiole design (30; T-C) SVC MZS OEZ:38368 multiole design (31; T-S, TT) SVM275-ZS OEZ:13005 SVC MZS OEZ:38366 multiole design (30; T-C) SVC MZS OEZ:38368 multiole design (31; T-S, TT) SVM--Z (SVM-440-Z) OEZ:34723 SVC MZ OEZ:42380 multiole design (11; T-S, TT) SVM--Z (3 cs SVM-440-Z) OEZ:34723 SVC MZ OEZ:38367 multiole design (31; T-S, TT) SVC OEZ:38842 SVC MZ OEZ:42378 adequate design SVC S OEZ:38843 SVC MZS OEZ:42379 adequate design SVF VB-MZ OEZ: V-MZ OEZ:42708 adequate design SVF VB-MZ OEZ: V-MZS OEZ:42709 adequate design SVF-600-3V-MZ OEZ: V-MZ OEZ:42711 adequate design SVF-600-3V-MZ OEZ: V-MZS OEZ:42712 adequate design SVD-250M-ZS OEZ:34725 SVD MZS OEZ:38371 adequate design SVD250M-ZS OEZ:13020 SVD MZS OEZ:38371 adequate design Varistor function test Varistor is able to rovide rotection against overvoltage reeatedly. However, every such actuating changes its structure to certain extent. We can detect by timely varistor check whether is this change of structure and resulting varistor function already beyond the accetable limit or not. Standard E requires besides others also eriodic overvoltage rotections checks. This check is usually comleted with varistor measurement. On rincile, the check of overvoltage rotections is carried out by connecting to the DC voltage, while increasing the voltage to the oint when current 1 ma flows through the arrester. Subsequently the voltage level is deducted. This rocedure shall be reeated for oosite olarity as well. If the deducted voltage level is in between the Voltage tolerance zone given in the table, the overvoltage rotection is functional. the oosite case it is necessary to relace the overvoltage rotection or its module. The table of Voltage tolerance zones is given below. Table of tolerance zones at 1 ma Tye designation ote Order Voltage tolerance code zone at 1 ma -1-MZ OEZ: V -1-MZS OEZ: V -3-MZ OEZ: V -3-MZS OEZ: V -3-MZ OEZ: V -3-MZS OEZ: V -4-MZ OEZ: V -4-MZS OEZ: V -1-M Relaceable module OEZ: V SJBC-25E-3-MZS - only varistor module is measured OEZ: V SJBC-25E-3-MZS - only varistor module is measured OEZ: V SVC M Relaceable module OEZ: V SVC MZ OEZ: V SVC MZS OEZ: V SVC MZ OEZ: V SVC MZS OEZ: V SVC MZ OEZ: V SVC MZS OEZ: V SVC MZ OEZ: V SVC MZS OEZ: V Tye designation ote Order Voltage tolerance code zone at 1 ma SVC MZ OEZ: V SVC MZS OEZ: V SVC M Relaceable module OEZ: V V-MZ OEZ: V V-MZS OEZ: V V-M Relaceable module OEZ: V V-MZ OEZ: V V-MZS OEZ: V -800-V-M Relaceable module OEZ: V -3V-MZ OEZ: V -3V-MZS OEZ: V -V-M Relaceable module OEZ: V V-MZ OEZ: V V-MZS OEZ: V -720-V-M Relaceable module OEZ: V SVD MZS T3 OEZ: V SVD MZS T3 OEZ: V SVD AS T3 OEZ: V SVM-440 OEZ: V SVM-440-ZS OEZ: V D25

6 RECOMMEDATIOS FOR DESIG, ISTALLATIO AD MEASUREMET OF OVERVOLTAGE PROTECTIOS ISTALLATIO OF OVERVOLTAGE PROTECTIOS 1. stallation of lightning current arresters Lightning current arresters, i.e. the arresters of tye 1 are installed mainly on the interface of zones LPZ0/ LPZ1. The main switchboard is usually laced on this interface. The devices are installed on U rail tye TH 35 (DI rail). stallation of the lightning current arresters in metering switchboard shall be aroved by relevant ower distribution comanies. not measured art, use the lightning current arresters SJBlus-... or SJB-25E stallation of comact combined surge voltage arresters of tye We recommend to install the comact combined arrester tye 1 and 2 ( SJBC = sark ga varistor) in the main switch board on U rail tye TH 35, in case it is ossible to unite the boundaries of lightning rotection levels LPZ0/ LPZ1 and LPZ1/LPZ2. With its arameters and small dimensions, this combination is suitable for both industrial alications and alications in buildings, aartments etc. The advantage of combined arresters is that they rovide comlete solution for given system (etc. T-C, T-S) without the need of interconnecting busbars etc. - one device = comlete solution. If it is not ossible to unite the boundaries of lightning rotection levels LPZ0/LPZ1 and LPZ1/ LPZ2 (etc. in block of flats - in the unmeasured art there can not be installed varistor based overvoltage rotection), then tye SJB-25E- has to be used on the boundary of LPZ0/ LPZ1 and tye SVC-...on the boundary of LPZ1/ LPZ2. Combined arrester of lightning current tye 1 and tye 2 (SVBC varistor) can be used in switchboards of individual flats in cases when it is not ossible to install common first rotection stage (etc. block of flats, where there is not allowed to install in unmeasured art any tye of overvoltage rotection). Combined arrester of lightning current SVBC is thank to lightning current searation in several branches convenient rotection for these alications. It is installed on U rail tye TH stallation of surge voltage arresters Surge voltage arresters are installed mainly on boundaries of LPZ1/LPZ2 that means in subsidiary switchboard behind the arresters of lightning current installed in the main switchboard. They are installed on U rail tye TH 35. It is necessary to ensure coordination of individual rotection stages at installation. For more information see aragrah Coordination of overvoltage rotection. 4. stallation of surge voltage arresters T3 Surge voltage arresters SVD are installed on U rail of tye TH 35. If the length of the line between and T3<5 m, it is not necessary to use T3 the arameters of coordination and T3 would not be fulfilled. Protection is sufficiently rovided by the surge voltage arrester. stall another surge voltage arresters of stage 3 at least 10 m downstream of the revious T3. Surge voltage arresters of stage 3 can be connected to the line both lengthwise and cross-wise. Cross-connection to the line is advantageous in articular if the current flowing through the line is higher than the ermitted rated load current I L of the surge voltage arrester T3. Continuous connection Transversal connection L L max. 0.5 m 5. stallation of surge voltage arresters for hotovoltaic systems and are installed on U rail tye TH 35 usually at the solar anel. At the length of the line between solar anels and inverter L > 10 m we recommend to install the overvoltage rotection also at the inverter on the DC side. F F PROTECTIO OF OVERVOLTAGE PROTECTIOS 1. Protection of lightning current arresters Protection can be lemented in two ways: rotection only by fuses in the house main switchboard, if corresond to the values stated in the table of technical arameters of given tye. However, if in such wiring there are leakages and follow short-circuit currents, though the SJB arresters are able to quench the follow short-circuit currents, may blow with subsequent interrution of ower suly in the building. use of fuses F2 in addition to if the latter are too big or if you do not want to interrut the ower suly. such case selectivity must be ensured between and F2 i.e. I n 1.6 x I nf2. With this ratio of rated currents, F2 will cut out sooner than, and the ower suly of the building will not be interruted. However the values I nf2 may be low and F2 will blow more frequently. For this reason it is recommended to equi the fuse F2 with a signalling device. 2. Protection of surge voltage arresters The revious aragrah alies also to the rotection of surge voltage arresters, however in Wiring diagram examles these fuses are designated F3. 3. Protection of surge voltage arresters T3 Surge voltage arresters SVD shall be rotected by circuit breakers or fuses gg max. 25 A. 4. Protection of arresters for connection 31 Arresters for connection between and conductors, i.e. the arrester SJB--1.5 and the module between and for the other versions are not rotected searately. Because their rotection is already rovided by fuses, F2 or F3, see the wiring diagram examles. 5. Protection of arresters for hotovoltaic systems It is not needed to rotect the arrester for hotovoltaic systems in any secial way. However, in case of two varistors design and one sark ga the limit of maximum shortcircuit current has to be considered. COORDIATIO OF OVERVOLTAGE PROTECTIO The correct function of multile stage rotection is conditioned by correct coordination of individual stages. At first the most sensitive stage of rotection reacts. Before it gets overloaded the suerior stage has to react. It is valid in case of and that if their mutual distance is bigger than 10 m (the length of conductors), the coordination is guaranteed by the hysical features of the lines. It means that we can use any combination of first and second rotection stage (once we follow other installation instructions). case we need to install closer to, it is necessary to use combination of overvoltage rotection designed for this urose. < 5 m 5 10 > 10 SJBlus-50-2,5 SVM SVC arbitrary SJB-25E-.. SVC SVC arbitrary > 5 m It is necessary to observe the minimal distance 5 m for the coordination between the second end the third stages of the rotection. T3 D26

7 SVC MZ RECOMMEDATIOS FOR DESIG, ISTALLATIO AD MEASUREMET OF OVERVOLTAGE PROTECTIOS Low installation thread a) Family houses without lightning conductor and exosed conductive arts Conducted by underground cable line. Where there is no threat of direct lightning stroke to the nearby building with lightning conductor which is galvanically connected to the rotected building. b) dividual housing units It is ossible to install common first rotection stage in the main switchboard in the block of flats. Standard solution SVC MZ (OEZ:38365) F2 > if 125 A T-C SVC MZ (OEZ:38365) F2 > if 125 A T-C-S SVC MZ (OEZ:40861) F2 > if 125 A T-S SVC MZ (OEZ:38367) F2 > if 125 A T-S, TT D27

8 -3-MZS U 1,2 kv U 1,2 kv U 1,2 kv I 12,5 ka I 12,5 ka I im 12,5 ka -3-MZS U 1,2 kv I 12,5 ka U 1,2 kv I 12,5 ka -4-MZ U 1,2 kv I im 12,5 ka U 1,2 kv U 1,2 kv U 1,2 kv U 1,2 kv I 12,5 ka I im 12,5 ka I 12,5 ka I 12,5 ka -3-MZ U 1,2 kv I 12,5 ka U 1,2 kv I im 12,5 ka U 1,2 kv I 12,5 ka U 1,7 kv I 50 ka I n 50 ka SVBC-50 SVC MZ SVC-350 RECOMMEDATIOS FOR DESIG, ISTALLATIO AD MEASUREMET OF OVERVOLTAGE PROTECTIOS Medium installation thread a) Family houses Where there is a threat of direct lightning stroke to the rotected building or to the nearby building with lightning conductor which is galvanically connected to the rotected building - level of rotection against lightning LPL III or LPL IV. With overhead cable line. b) dividual housing units the block of flats where it is not ossible to install common first rotection stage in the main switchboard and where due to lightning current searation in several branches its level does not exceed 12.5 ka (10/350 μs). Standard solution Solution for necessary and searation T-C -3-MZ (OEZ:40619) F2 > if 160 A SJB-25E-3-MZS (OEZ:38357) F2 > if 315 A SVC MZ (OEZ:38365) F3 > if 125 A T-C-S -3-MZ (OEZ:40619) F2 > if 160 A SJB-25E-3-MZS (OEZ:38357) F2 > if 315 A SVC MZ (OEZ:38367) F3 > if 125 A SJB-25-3-MSZ T-S -4-MZ (OEZ:40623) F2 > if 160 A SJB-25E-3-MZS (OEZ:38358) SJB-25-3-MSZ SVC MZ (OEZ:40861) F2 > if 315 A F3 > if 125 A T-S, TT -3-MZ (OEZ:40621) F2 > if 160 A SJB-25E-3-MZS (OEZ:38358) SJB-25-3-MSZ SJB-25-3-MSZ SVC MZ (OEZ:38367) F2 > if 315 A F3 > if 125 A D28

9 SVC MZ SVC-350 RECOMMEDATIOS FOR DESIG, ISTALLATIO AD MEASUREMET OF OVERVOLTAGE PROTECTIOS Big installation thread a) Family houses with lightning conductor or exosed conductive arts. deendent on connection tye. Where there is a threat of direct lightning stroke to the rotected building or to the nearby building with lightning conductor which is galvanically connected to the rotected building - level of rotection against lightning LPL I or LPL II. b) dividual housing units. the block of flats where it is not ossible to install common first rotection stage in the main switchboard and where the lightning current can exceed 12.5 ka (10/350 μs). Standard solution Solution for necessary and searation SJBC-25E-3-MZS (OEZ:38361) SJB-25E-3-MZS (OEZ:38357) SVC MZ (OEZ:38365) F2 > if 315 A F2 > if 315 A F3 > if 125 A T-C SJBC-25E-3-MZS (OEZ:38361) F2 > if 315 A SJB-25E-3-MZS (OEZ:38357) F2 > if 315 A SVC MZ (OEZ:38367) F3 > if 125 A T-C-S SJB-25-3-MSZ SJBC-25E-3-MZS (OEZ:38362) F2 > if 315 A SJB-25E-3-MZS (OEZ:38358) SJB-25-3-MSZ SVC MZ (OEZ:40861) F2 > if 315 A F3 > if 125 A T-S SJB-25-3-MSZ SJBC-25E-3-MZS (OEZ:38362) F2 > if 315 A SJB-25E-3-MZS (OEZ:38358) SJB-25-3-MSZ SVC MZ (OEZ:38367) F2 > if 315 A F3 > if 125 A T-S, TT D29

10 RECOMMEDATIOS FOR DESIG, ISTALLATIO AD MEASUREMET OF OVERVOLTAGE PROTECTIOS dustrial and secial alications a) dustrial alications, where higher requirements for overvoltage rotections have to be met, e.g. due to high short-circuit current. The searation of lightning current is the same as in case of big installation threat. b) The searation of lightning current is the same as in case of big installation threat. Standard solution Solution for necessary and searation T-C 3 cs SJBlus-50-2,5 3 cs SVM-440-Z S F2 > if 125 A 3 cssjblus-50-2,5 S cssvm-440-z F2 > if 500 A S F3 > if 125 A 4 cs SJBlus-50-2,5 S cs SVM-440-Z 4 cssjblus-50-2,5 S cssvm-440-z S T-S F2 > if 125 A F2 > if 500 A F3 > if 125 A T-C T-S, TT 3 cs SJBlus-50-2,5 3 cs SVM-440-Z 1 c SJB--1,5 (OEZ:34716) SJBlus-50-2,5 SVM-440-Z S F2 > if 125 A F2 > if 125 A 3 cs SJBlus-50-2,5 1 c SJB--1,5 (OEZ:34716) S cssvm-440-z 1 c SVM--Z (OEZ:34723) F2 > if 500 A SJBlus-50-2,5 SVM-440-Z F2 > if 500 A S F3 > if 125 A F3 > if 125 A D30

11 1,9 kv 1,9 kv 1,9 kv 1,8 kv I 5 ka 1,9 kv 1,9 kv 1,9 kv 1,8 kv 1,8 kv 1,8 kv 1,8 kv I 5 ka I 5kA I 5 ka I 5kA 1,8 kv I 5kA 1,9 kv 1,9 kv 1,9 kv 1,9 kv 1,9 kv 1,9 kv 1,8 kv I 5kA 1,8 kv 1,8 kvu 1,8 kv 1,8 kv I 5kA I 5 ka I 5kA I 5 ka 1,8 kv I 5 ka 1,9 kv 1,9 kv 1,9 kv 1,9 kv 1,9 kv 1,9 kv 1,8 kv I 5kA 1,8 kv 1,8 kvu 1,8 kv 1,8 kv I 5kA I 5 ka I 5kA I 5 ka 1,8 kv I 5 ka RECOMMEDATIOS FOR DESIG, ISTALLATIO AD MEASUREMET OF OVERVOLTAGE PROTECTIOS Photovoltaic systems Photovoltaic array DC switch-disconnector Converter AC switch- -disconnector Measuring Switchboard Main switch- Measuring Main Transformer -disconnector rotection Wh Wh Protection against overvoltage DC AC Protection against overvoltage Protection against overvoltage a) Photovoltaic sources, where there is no threat of direct stroke to the solar anel or lines Deendent on the length of line between the anels and the inverter one or two devices are used. general, at the length of line > 10 m we use the overvoltage rotection at both the solar anel and the inverter, at the length of the line L 10 m we use the overvoltage rotection either at the solar anel or at the inverter. Design V-MZ(S) or V-MZ(S). ) V-MZ-MZ ( OEZ:42708) 10 m V-MZ-MZ ( OEZ:42708) m V-MZ-MZ ( OEZ:42708) m m V-MZ ( OEZ:42708) V-MZ ( OEZ:42708) V-MZ ( OEZ:42708) ) b) Photovoltaic sources, wherein there is a risk of direct stroke in a anel or a line, esecially in cases, where the anel is connected with the arresting system galvanically Deendent on the length of line between the anels and the inverter one or two devices are used. general, at the length of line > 10 m we use the overvoltage rotection at both the solar anel and the inverter, at the length of the line L 10 m we use the overvoltage rotection either at the solar anel or at the inverter. Design -3V-MZ(S) or V-MZ(S). 10 m 10 m 10 m -1 C-DC V-MZ 050-3V-MZ -MZ (OEZ:42714) (OEZ:42714) SVB C-DC V-MZ -MZ (OEZ:42714) SVB C-DC V-MZ -MZ (OEZ:42714) D31