kep - 1000. an equal potential clamp is a device than equalises two different potentials. engineered...
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KAYSANEQUAL POTENTIAL CLAMP
KEP - 1000
What is an Equal Potential clamp?
An Equal Potential Clamp is a device than equalises two different potentials .
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What causes unequal potentials ?
Unexpected rises between different power systems as a result of LIGHTNING, WIND, ACCIDENT or SYSTEM MALFUNCTION.
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WHAT STOPS IT ?
A passive component that forms a hard bond between the potentials to reduce the difference to a
safe level..
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A Large Gas Arrestor !
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How good is it ?
ARRESTOR PERFORMANCE Voltage 70volts Energy rating 500 kA 8/20 uS Gas Arrestor 2 terminal device Spark over Voltage 56 ~ 84 VDC Max Impulse Breakdown <600v / uS … 100v/uS Nominal AC Discharge Current 500 Amps DC Holdover Voltage 50 volts Nom. alternating discharge Current (50 hZ 9 cycles) (A) 4000 Amps Long duration surge 4kA for > 400 mS Nominal Impulse Discharge 200KA 10/350uS Insulation Resistance > 10 megohm Series impedance once fired < 0.025 ohms Max Capacitance <20 pF Storage / operating Temp -40 ~ +90 C Weight 0.5kgs
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What Happens ? When a voltage is applied across the terminals in excess of 70 volts the gas fires . When this happens it effectively creates a short circuit across the terminals to create a “HARD BOND” [resistance <0.025 ohms].
This bond will continue until the voltage reduces below 70 volts. ENGINEERED WITH QUALITY
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Should the voltage surge extend beyond 400 ms the arrestor will become hot. This heat increase triggers a solenoid that immediately activates a solid bar to place a direct short across the terminals. This direct short continues until the temperature of the arrestor falls 15 degrees below the activation level.If the voltage is still in excess of the trigger voltage the sequence continues until the problem is resolved or an external source removes the potential.
Shorting bar4 x Silver plated contacts .. 20mm dia.
Gas arrestor
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Heat sensor
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12 volt Battery for solenoid
System Test shield
Heavy duty solenoid
Cable connection
Long life 12v heavy duty rechargeable battery.Easy changeover or optional charger / solar
panel available
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M20 brass studs for cable terminations x 2Cables enter via cable glands in base of IP66 rated cabinet
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HOW DO I TEST THE SOLENOID AND BATTERY ?
GUARD INSULATOR ……. NORMAL
GUARD INSULATOR …. NORMAL OPERATED / CONTACTS CLOSED
GUARD INSULATOR IN TEST POSITION.. INSULATOR COVERS CONTACTS WHEN TEST SWITCH PUSHED ………….RETURN GUARD TO NORMAL AFTER TEST
Where should I use an Equal potential clamp ?
•Wherever a need exists to clamp 2 separate electrical earthing systems together during fault conditions ONLY.
•Where-ever protection is necessary on ELV equipment against very high sustained surges and overvoltage conditions.
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Bonding Two Separate Electrical Systems
Operational conditions need these 2 systems be separated.
However for safety reasons these separate systems should be bonded together.Possible dangerous touch potentials exist.Damage to equipment that could cause a disaster.
Bonding Two Separate Electrical Systems
Protection of ELV Equipment
Areas may have high voltages present that can damage ELV equipment.
•Conductors attached to these circuits may be exposed to surge voltages and currents during fault conditions.
•In areas of high vulnerability, it may be advisable to ensure the fault current has a predetermined path.
Protection of ELV Equipment
Protection of ELV Equipment
Where could this happen ?
The highest risk of contact wire droppage is at level crossings !
TrucksHigh machinery
CranesDouble deck busesRadio aerials and
Ladders. ht
Indirect damage from wire drop will mostly be to track circuit equipment as a minimum.
Such as:-Track relays
Surge arrestorsTrack circuit wiringTrack circuit fuses
plus unknown signaling equipment
How can we mitigate this direct damage ?
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How can we mitigate this direct damage ?
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ANSWER !!KAYSAN
Equal Potential Clamp
KEP - 1000
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Made and Designed in New Zealand by KaysanGas Arrestor Made by Prosurge Electronics
for Kaysan
A member of GRS.
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