Article by: cpswitchgear.com
The following is the process to change out the overcurrent rating plug in an Eaton/Cutler Hammer Digitrip 1150 and 520 family of Power Circuit Breaker Trip Units. I will explain below the process, but first I want to make sure you remember a few basic steps before inserting a new rating plug. I will also talk a little about the operation of the current transformers.
Let's say for instance the tap is rated at 600 amps. If the circuit breaker is set up properly, the current transformers ( CT's )on each phase will also be 600 amps. Always check the current transformers before changing and inserting a new tap into the relay. A 1200 amp tap will fit into the same relay, but the breaker will not trip on the overcurrent settings as designed. ***** Never energize any circuit breaker without the overcurrent device attached. Damage to the internal CT's may occur because the circuit is now open, making for no protection for the load circuit.
Now to insert the rating plug, push it into the cavity on the right-hand side of the trip unit. There are three pins that need to be aligned on the plug with the sockets in the opening. Insert the plug with minimal force and the rating plug is now inserted and ready for testing. The overcurrent relay can be tested either by primary, or secondary injection. The power relay module is a standard accessory that will power up trip unit module for testing purposes.
For more information, please visit www.cpswitchgear.com or call Carolina Precision Switchgear at 704-596-4242.
2/03/2011
7/29/2010
Digitrip 1150 Overcurrent Relay
Article By: cpswitchgear.com
The process to change out the overcurrent rating plug in an Eaton/Cutler Hammer Digitrip 1150 relay is fairly simple, if you remember a few basic steps.
Let's say for instance the tap is rated at 600 amps. If the circuit breaker is set up properly, the current transformers ( CT's )on each phase will also be 600 amp. Always check the current transformers before changing and inserting a new rating plug into the relay. A 1200 amp tap will fit into the same relay, but the breaker will not trip on the overcurrent settings as designed. ***** Never energize any circuit breaker without the overcurrent device attached. Damage to the internal CT's may occur because the circuit is now open, making for no protection for the load circuit.
Now to insert the rating plug, push it into the cavity on the right-hand side of the trip unit. There are three pins that need to be aligned on the plug with the sockets in the opening. Insert the plug with minimal force and the rating plug is now inserted and ready for testing. The overcurrent relay can be tested either by primary, or secondary injection.
For more information, please visit www.cpswitchgear.com or call Carolina Precision Switchgear at 704-596-4242.
The process to change out the overcurrent rating plug in an Eaton/Cutler Hammer Digitrip 1150 relay is fairly simple, if you remember a few basic steps.
Let's say for instance the tap is rated at 600 amps. If the circuit breaker is set up properly, the current transformers ( CT's )on each phase will also be 600 amp. Always check the current transformers before changing and inserting a new rating plug into the relay. A 1200 amp tap will fit into the same relay, but the breaker will not trip on the overcurrent settings as designed. ***** Never energize any circuit breaker without the overcurrent device attached. Damage to the internal CT's may occur because the circuit is now open, making for no protection for the load circuit.
Now to insert the rating plug, push it into the cavity on the right-hand side of the trip unit. There are three pins that need to be aligned on the plug with the sockets in the opening. Insert the plug with minimal force and the rating plug is now inserted and ready for testing. The overcurrent relay can be tested either by primary, or secondary injection.
For more information, please visit www.cpswitchgear.com or call Carolina Precision Switchgear at 704-596-4242.
5/25/2010
Infrared (Thermography) Surveys
Article By: cpswitchgear.com
A service provided by Carolina Precision Switchgear is thermal imaging. CPS can identify problem areas in your electrical distribution system by performing an infrared survey. The thermography cost is minimal compared to expensive damage that your equipment may incur, not to mention equipment down time. The equipment we use is a Fluke IR imaging camera which conducts detailed temperature readings. Thermography allows one to see variations in temperature. The Fluke infrared camera can pinpoint the exact area where corrective maintenance on your equipment is needed.
Infrared scanning can be performed with no disruption to your normal production schedule. The preferred method and most effective is with your facility under full load. In the building construction industry, technicians can see thermal differences that indicate heat leaks in defective thermal insulation and can use the results to increase the efficiency of heating and air-conditioning units.
The following is a small list of where thermographic imaging is beneficial.
Electrical Switchgear
Circuit Breakers
HVAC
Building Envelopes
Building Insulation
Control Panels
Electrical Panels
For more information, please visit www.cpswitchgear.com or call Carolina Precision Switchgear at 704-596-4242.
A service provided by Carolina Precision Switchgear is thermal imaging. CPS can identify problem areas in your electrical distribution system by performing an infrared survey. The thermography cost is minimal compared to expensive damage that your equipment may incur, not to mention equipment down time. The equipment we use is a Fluke IR imaging camera which conducts detailed temperature readings. Thermography allows one to see variations in temperature. The Fluke infrared camera can pinpoint the exact area where corrective maintenance on your equipment is needed.
Infrared scanning can be performed with no disruption to your normal production schedule. The preferred method and most effective is with your facility under full load. In the building construction industry, technicians can see thermal differences that indicate heat leaks in defective thermal insulation and can use the results to increase the efficiency of heating and air-conditioning units.
The following is a small list of where thermographic imaging is beneficial.
Electrical Switchgear
Circuit Breakers
HVAC
Building Envelopes
Building Insulation
Control Panels
Electrical Panels
For more information, please visit www.cpswitchgear.com or call Carolina Precision Switchgear at 704-596-4242.
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