DS33738 1200A 250V Test Summary0 pages

MIL-STD-188-125-1 ACCEPTANCE PCI TESTING SUMMARY
MPE DS33738/275 HEMP Filter (1X 1200 A, 250 VAC)
Jaxon Engineering and Maintenance (JEM) has performed MIL-STD-188-125-1 short (E1) pulse
acceptance PCI testing on a production unit of HEMP PPD (Point-of-Entry Protective Device) PN
DS33738/275 manufactured by MPE of Liverpool, UK. The DS33738/275 is a single-line filter rated at
1200 A and 250 VAC with surge protection provided by a single CKE Z60M431 MOV (metal-oxide
varistor). Multiple DS33738/275 units can be utilized for the HEMP protection of typical multi-wire
power systems.
The MPE DS33738/275 was classified as an unrestricted intersite commercial power line PPD as
defined in in MIL-STD-188-125-1. The short (E1) pulse acceptance PCI testing of the DS33738/275 was
performed IAW MIL-STD-188-125-1 using a clean-side line-to-ground dummy resistive load of 0.23 Ω.
The unit tested met all applicable performance requirements given in MIL-STD-188-125-1. There was
no evidence of damage or degradation resulting from application of the short pulse transients.
Furthermore, the peak, derivative and root action norms of the measured short pulse residual current
waveforms were well below the applicable limits given in MIL-STD-188-125-1 as highlighted below.

SHORT PULSE NORM

LIMIT

WORST CASE

Peak Current

10 A

6.2 A

Peak di/dt

1E7 A/sec

8.8E5 A/sec

Root Action

1.6E-1 A√sec

5.1E-2 A√sec

DS33738/275 – MIL-STD-188-125-1 Acceptance PCI – Worst Case E1 Residual Current Norms

A summary of the maximum residual current peak, derivative and root action norms at each
injection level measured during the MIL-STD-188-125-1 short (E1) pulse acceptance PCI testing of the
MPE DS22738/275 with CKE Z60M431 PPD is provided below.
DS33738/275 – MIL-STD-188-125-1 Acceptance PCI – Maximum Norms versus Injection Level
DS33737/480 with Z60M431
NORM and LIMIT

INJECTION LEVEL (A)
50

125

250

500

1000

1750

2500

MAX PEAK

10 A

0.7

1.5

2.4

3.7

5.2

5.6

6.2

MAX DERIVATIVE

1E7 A/sec

1.1E+05

2.5E+05

4.0E+05

6.1E+05

8.0E+05

8.2E+05

8.8E+05

MAX ROOT ACTION

1.6E-1 A√sec

5.0E-03

1.2E-02

2.0E-02

3.0E-02

4.2E-02

4.6E-02

5.1E-02

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