New Tests for Surge Protectors coming to a standard near you

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Kristian Mathews
5 years ago
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1 New Tests for Surge Protectors coming to a standard near you Presented by Mick Maytum m.j.maytum@ieee.org

2 Differential-mode surge generation Inherently the surges on twisted pair wires are common-mode (longitudinal). Differential-mode (metallic) surges on twisted pair wires are generally assumed to be generated by joint or insulation breakdown of a single wire Voltage V Wire 1 of pair Wire 2 of pair Transverse surge Time µs or asynchronous operation of surge protection protecting the wire pair. The common-mode surge on the twisted pair wires (Figure red trace and blue traces) is converted to an inter-wire differential surge (green trace) by asynchronous surge protector operation. 2

3 Differential-mode surge generation measurement IEEE Std C62.36 Standard for Test Methods for Surge Protectors Used in Low- Voltage Data, Communications, and Signaling Circuits, currently in ballot R /50-8/20 combination-wave generator Hi Lo R2 25 DUT R3 50 Differential voltage probes Current probe Digital Recorder 3

4 Differential-mode surge generation voltage measurement with balun balun DUT voltage probe Digital Recorder R3 50 4

5 In-line surge protector Impulse let-through current ITU-T Recommendation K.28 (05/2012) Parameters of thyristor-based surge protective devices for the protection of telecommunication installations Cable Protected Rated Current Hi Surge Generator Lo DUT C I O(SC) Digital Current Recorder 5

6 In-line surge protector protected port ground potential rise IEEE Std C62.36 Standard for Test Methods for Surge Protectors Used in Low- Voltage Data, Communications, and Signaling Circuits, currently in ballot Cable Protected Surge Protector G Equipment G GPR Surge 6

7 In-line surge protector protected port ground potential rise test Cable Protected Surge Protector R Hi Hi 10/700 Surge Generator G Lo G 7

8 In-line surge protector inductive grounding lead IEEE Std C62.36 Standard for Test Methods for Surge Protectors Used in Low- Voltage Data, Communications, and Signaling Circuits, currently in ballot GR-1089-CORE 10/1000 -> 2/10 Line Protected I SURGE Surge Protector Equipment L V=Ldi/dt 8

9 In-line surge protector inductive grounding lead test The inductance L of a l m lead can be approximated to: L = 1.5 x l µh Cable Protected 1.2/50-8/20 Surge Generator G Hi Lo R Surge Protector G L 9

10 GDT Oscillation Under power induction test and field conditions has resulted in equipment failure OK Bad 10

11 GDT Oscillation test circuit DUT 600 V rms R2 GDT1 GDTA C2 D2 L P1 L S1 Longitudinal Power fault source R2 C1 L P2 L S2 D1 C3 R1 D3 Average voltage V O GDT2 11

12 Thyristor Differential Capacitance ITU-T Recommendation K.28 (05/2012) Parameters of thyristor-based surge protective devices for the protection of telecommunication installations. Capacitance: POTS <200 pf, ADSL <40 pf, VDSL <35 pf, VDSL <10 1 MHz, 1 V rms, 0 V d.c Normalized Capacitance V D - DC Bias Voltage - V

13 GDT Voltages - V Series connected GDTs sparkover operation for 48 V DC rails 1800 GDT GDT1 v GDT2 GDT GDT2 GDT3 t GDT4 600 GDT4 GDT GDT5 60 V Time 13

14 Voltage - V Series connected GDTs compensated sparkover operation for 48 V DC rails 400 GDT1 C1 300 GDT1 v GDT2 GDT3 C2 C3 200 GDT2 GDT3 t GDT4 C4 100 GDT4 GDT5 GDT Time 14

Telcordia GR-1089-CORE Issue 4 Topics Primary Protection

Telcordia GR-1089-CORE Issue 4 Topics Primary Protection Bourns engages in standards development and produces components that will help customers products comply with published standard requirements. For