1200A Power Line HEMP filter independently tested and certified by Jaxon Engineering & Maintenance as meeting the pci requirements of Mil-Std-188-125-1 and -2 and Def Stan 59-188 parts 1 and 2 for E1 and E2 pulses. The filter has no internal parallel filter circuits and features inductive input to offer both good continuous wave EMC performance and superior transient handling performance even on supplies with low source impedance. The filter is fitted with high-energy transient suppressors. Filters are supplied as single line units for ease of handling and installation but four filters are normally used together for filtering three phase plus neutral supplies.
Customised end enclosures are normally fitted to provide screening of input and output terminals, and to interface with the customer’s connection requirements.
All MPE HEMP filters are tested using the test methods defined within the following standards and meet or exceed the relevant performance and/or safety criteria defined within these standards:
CISPR17:2011/BS EN 55017:2011
|Rated Voltage||Single phase||250Vac 50/60Hz or 277Vac 50/60Hz|
|Three phase||250/440Vac 50/60Hz or 277V/480Vac 50/60Hz|
|Test Voltage||2250Vdc each line to case (Prior to fitting transient suppressors)|
|Rated Current per Line @50C*||1200A|
|Insulation Resistance||>100MΩ (Prior to fitting discharge resistors)|
|Discharge Resistors||Fitted internally from each line to case|
|Discharge Time to below 34V||<60s|
|Maximum Temperature Rise on Full Load||<25ºC|
|Full Load Operating Temperature Range||-40ºC to +50ºC|
|Leakage Current at 250Vac 50Hz||<14A|
|Maximum DC Voltage Drop per line at 1200Adc||60mV|
|Peak Surge Current of Transient Suppressors||70kA (8/20μs)|
|Varistor Voltage Rating||250V/440V||275Vac|
Typical insertion loss In 50Ω system with / without load
|Minimum Insertion loss||20dB||40dB||60dB||80dB||80dB||80dB|
|Typical Insertion Loss||45dB||65dB||95dB||100dB||100dB||100dB|
|MIL STD 188-125-1 acceptance test, short pulse current injection, wave shape 20/500ns|
|Input pulse amplitude||250A||500A||1000A||1800A||2500A|
|MIL-STD-188-125 residual requirement||<10A||<10A||<10A||<10A||<10A|
|Typical filter residual let-through (277/480V version)(250/440V version is less)||<3A||<4.5A||<6.5A||<7A||<7.5A|
|MIL STD 188-125-1 acceptance test, intermediate pulse current injection, wave shape 1.5/3000ns|
|Input pulse amplitude||250A|
|MIL-STD-188-125 requirement||No filter damage or performance degradation|
|Typical filter response||No filter damage or performance degradation|
Material: Stainless steel
Finish: Paint (base paint free)
Approx. Weight: 300kg
Four filters are normally used together for use on three phase systems. Filters are supplied as single lines for ease of shipping and installation, and are designed for mounting in close proximity. Filters should be mounted on clean unpainted mounting surface to ensure a good low-impedance earth bond and RF connection is made to the underside of the filter.
Because every installation of such high current filters tends to be different, they all generally need customised shielded termination enclosures to interface with the cables or busbars used for power connections.
Both ends of the filter are provided with blind inserts to make a good quality shielded interface to external terminal chambers. Wire mesh gaskets are needed between the filters and the terminal chambers, and these gaskets can be provided by MPE, if required.
MPE can also provide customised terminal compartments to interface with these filters, or alternatively, the user can provide his own but must ensure that clean unpainted and flat mating surfaces are used to interface to the filter via the wire mesh gasket. the interface fixing bolts (M6) should be tightened to a maximum torque or 2.5N-m. (22lbf-in)
Relevant safety standards have been adhered to in the design and manufacture of these filters. However, all capacitors will store charge after power has been removed and must be treated with respect as a shock can be lethal if the voltage and charge are high enough. Even though discharge resistors are fitted to this range of filters, terminals should always be shorted to earth prior to touching to ensure the capacitors are fully discharged.
The user should ensure he is familiar with restrictions on capacitance value, earth leakage current, test voltage, and safety labelling requirements, which may be applicable to his particular installation.
These filters must be solidly and permanently earthed, both for safe operation and to achieve optimum EMC and pulse performance.
250V version for use on supplies up to 250/440Vac 50/60Hz Part number DS33738
277V version for use on supplies up to 277/480Vac 50/60Hz Part number DS33738/480
Wire mesh interface gasket Part number 64/829712