HV DIN FUSE-LINKS FOR TRANSFORMER PROTECTION. March 2017

Transcription

1 HV DIN FUSE-LINKS FOR TRANSFORMER PROTECTION March 2017

2 HV FUSE-LINKS IN THE WORLD UL STANDARD E OR R RATED: AMERICAN STANDARD DIN STANDARD: GERMAN STANDARD FR STANDARD: FRENCH STANDARD BS STANDARD: BRITISH STANDARD SPECIAL HV FUSES Mersen is offering UL, DIN, FR and special HV fuse-links 2 2

3 LIMITOR Mersen has dedicated a brand to HV fuse-links: Limitor A brand that is easily recognizable Limitor promises: Expertise in High Voltage applications A premium offering for the HV market Delivering reliability and safety 3 3

4 HV FUSES STANDARD: IEC HIGH-VOLTAGE FUSES PART 1: CURRENT-LIMITING FUSES This part of IEC applies to all types of high-voltage current-limiting fuses designed for use outdoors or indoors on alternating current systems of 50 Hz and 60 Hz and of rated voltages exceeding 1000V. This standard defines test set-up, fuse characteristics and normal service conditions (without derating) like Operating temperature: -25 C to 40 C Altitude: 1000m maximum 4 4

5 3 TYPES OF HV FUSE-LINKS BACK-UP FUSE-LINKS RANGE Current-limiting fuse capable of breaking all currents from the rated maximum breaking current (I1) down to the rated minimum breaking current short-circuit protection, to be associated with a breaker for overvoltage protection GENERAL PURPOSE FUSE-LINKS RANGE Current-limiting fuse capable of breaking all currents from the rated maximum breaking current (I1) down to the current that causes melting of the fuse element in 1 hour (I3@1h) short-circuit & overvoltage protection FULL-RANGE FUSE-LINKS RANGE Current-limiting fuse capable of breaking all currents that cause melting of the fuse element(s), up to its rated maximum breaking current short circuit & overvoltage protection 5 5

6 3 TYPES OF HV FUSE-LINKS BACK-UP FUSE-LINKS 600s I n Current rating I 3 Minimum breaking current I 1 Maximum breaking current GENERAL PURPOSE FUSE-LINKS 1h I n Current rating I 1 Maximum breaking current FULL-RANGE FUSE-LINKS RANGE I n Current rating I 1 Maximum breaking current 6 6

7 BASIC RULES FOR BACK-UP 0,1s If I 3 I I 1 Fuse current rating Minimum breaking current Maximum breaking current IF > IN*1,35 : TO SUPPORT SMALL PERMANENT OVERLOAD IFU > IINRUSH : TO SUPPORT INRUSH CURRENT OF THE TRANSFORMER : 10 TO 12 *IN I3 < IK : TO PROTECT AGAINST SHORT CIRCUIT CURRENT FROM THE LV SIDE I1> ICC : TO PROTECT AGAINST THE SHORT CIRCUIT CURRENT FROM THE HV NETWORK 7 7

8 HV FUSES STANDARD: IEC/TR TUTORIAL AND APPLICATION GUIDE FOR HIGH-VOLTAGE FUSES this document is informative, not normative provides information for understanding the construction, operation and application of high-voltage fuses in general. current-limiting, expulsion, electronic etc non-current-limiting fuses rated above 1 kv AC are all covered, as are North American, European and other application practices. this technical report gathers information previously published in IEC and other publications All Mersen HV DIN Fuses defined in this presentation are in accordance with the IEC/TR standard. 8 8

9 TYPICAL INSTALLATION HV FUSE-LINKS Supply HV/LV Extract from the IEC : it is advisable to replace all three fuse-links when the fuse-link on one or two phases of a three-phase circuit has operated 9 9

10 HV DIN fuse-links 10 10

11 HV DIN FUSE-LINKS Applications: HV substations HV switchgear HV control gear and HV systems for reliable protection of HV/LV power distribution transformers and HV distribution network HV fuse-links protect apparatus and equipment against the thermal and dynamic effects of short-circuits. Designed to be coordinated with other equipment, these current-limiting fuse-links interrupt fault currents before they reach their peak

12 GERMAN STANDARDS TWO IMPORTANT STANDARDS VDE 0670 T4 = translation of IEC into German VDE 0670 T402 = selection of current-limiting fuses for transformer circuits (German addition to VDE 0670 T4) VDE 0670 T402 defines fuses with ratings 6.3A to 160A. Other ratings are automatically only VDE 0670 T4. VDE 0670 T402 defines additional limiting values for time-current characteristics and increase the performance of the selectivity between high voltage fuses and with LV gtr fuses

13 RATED VOLTAGE RANGE HV fuse-links must only operate in a certain voltage range. Owing to the over-voltage occurring during arcing, the fuse-link cannot be used at lower voltages without limitation. The installation should not be damaged by the over-voltage peak of the blowing fuse-link (installation s isolation distances defined by the used voltage) Usuel network voltage 6kV 10kV 15kV 20kV 30kV Voltage range 3kV / 7,2kV 6kV / 12kV 10kV / 17,5kV 10kV / 24kV 20kV / 36kV 13 13

14 FUSE-LINK DESCRIPTION 1. CAP 2. BODY 3. ROD 4. FUSE ELEMENT 5. SAND 6. STRIKER 14 14

15 HV FUSES STANDARD: DIN DIN defines the dimensions of HV DIN Fuses. All Mersen HV DIN fuse-links are in compliance with this standard. The diameter d is mainly dependant on the current rating (50 to 88 mm) and the length e is mainly dependant on the voltage rating (192 to 537mm) 15 15

16 FUSE DESCRIPTION FR VS DIN Epoxy fuse body Aluminium caps Fuse element in pure Silver Ceramic fuse body Copper caps Silver coating 16 16

17 MERSEN HV DIN FUSE-LINKS Mersen is offering limiting-current fuses with High breaking capacity, offering the best protection against short circuit current. Mersen is also a key player in innovative solutions to increase safety and efficiency with: cap design, low power dissipation, patented thermal striker. All Mersen HV DIN fuses are lead-free to ensure the safety of our environment

18 MERSEN RANGE AND STANDARDS International range Complies with IEC (VDE 0670 part 4) Backup Backup IEC DB P German range IEC (VDE 0670 part 4) IEC and VDE 0670 part DB PD* Backup, CPD 45DB PT Backup, CPD 45DB PTD* Backup, TS 45DB PT-x Backup, TS and LPL 45DB PTS** CPD = CONTROL OF POWER DISSIPATION TS = THERMAL STRIKER *LOWER POWER DISSIPATION LPL = LOW POWER LOSSES ** VERY LOW POWER DISSIPATION 18 18

19 STRIKER The striker is a mechanical device forming a part of a fuse-link which releases the energy required to cause operation of another switching device or signalling device. The Mersen striker is a medium type with an effective length of 30mm. The initial force is about 80N, the force at the end of free movement is about 15N. The minimum energy is 0.5 Joule

20 STRIKER MERSEN OFFERS 3 OPTIONS TO OPERATE THE STRIKER: Mechanical : when the fuse element melts (on all Mersen HV DIN fuses) Controlled power dissipation: The CPD controls the power dissipation of the fuse-link according to Ohm s law. As the back-up fuse-link is combined with a switch, the CPD operates the switch before an excessive power level is dissipated by the fuse-link. Thermal Striker: the TS patented by Mersen controls the temperature of the fuse-link and prevents overheating in the fuse compartment when installed with a switch-fuse combination. With the CPD and the TS, the fuse-link will not switch-off by itself. The mechanism for CPD or TS releases the striker, which will trigger a switch to switch-off

21 THERMAL STRIKER DESCRIPTION As requested by switch-fuse combination manufacturers. These fuses have to trigger the switch to open the three phases in case of overload whenever the temperature rises abnormally in a fuse, the thermal striker trips and triggers either a mechanical or an electronic system that will open the circuit 21 21

22 MELTING CURVES Fuse without thermal striker Fuse with thermal striker Thermal striker 22 22

23 LOW POWER LOSSES Mersen offers several technologies for fuse elements to propose a compromise between the cost and the performance / efficiency depending on the application. The latest innovation was made in 2011 with a new fuse element in castin-one-piece structure to reduce power dissipation. PT PTD PTS Efficiency PTD fuses were specifically developed to be installed in compact-sized enclosed substations because they have a limited thermal power acceptance. PTS fuses were specifically designed with low power losses and thermal striker to protect transformers in conjunction with air and SF6 insulated compact switchgear

24 FUSE SELECTION I/T CURVE DEFINITION: only two gates are given a) inrush current of transformer at 0,1 s (fuse-link must not switch-off) b) short circuit current of transformer at 2 s (fuse-link shall switch-off) in the example: fuse-links F2 and F3 are both suitable for this transformer selection of fuse-links according to I/t curves (or selection tables), not according to rated currents 24 24

25 FUSE SELECTION SELECTION TABLE AVAILABLE IN THE DATASHEETS: 25 25

26 OUTDOOR USE All our DIN fuse-links are for outdoor use and can be used also indoors. They are all tested at the end of production

27 HV DIN FUSE-LINKS RANGE 27 27

28 HV DIN FUSE-LINKS RANGE 28 28

29 CATALOG NUMBER 29 29

30 ALL DATA'S ARE ON THE FUSE-LINK 30 30

31 ACCESSORIES CLIPS BASES indoor outdoor INDICATING DEVICE NEUTRAL CONDUCTORS 292mm 442mm EXTERNAL ADAPTER 292/442MM 31

32 COMMUNICATION TOOLS ALL PRODUCTS AVAILABLE ON MERSEN WEBSITE EP.MERSEN.COM Product Datasheets 2D / 3D drawings Certificates PERFORMANCE CURVES Time-Current Curves Watts Loss Transformer selection table HV FUSE-LINKS BROCHURE 32

33 MERSEN: YOUR KEY GLOBAL PARTNER FOR HV FR Distribution fuse-links DIN distribution fuse-links UL distribution fuse-links Oil-tight distribution fuse-links Motor protection fuse-links Potential transformers fuse-links Public lighting fuse-links 33 33