Westinghouse CA-5 User Manual



 
    

    
      
        
       
        
       
         
 

     
        
     
       
       
    
 
      
      
     
      
        
 
 
      
 



     
           
         


       


     











      
 
         
   

        
  

      





  




   
 
     

  
   



 
 
  




  

         
            
           
        
       
 
        


       
      
      
        

  
       
 
      
       
      
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   
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       
      
      
       
        
         
      
      
       
        
      
      
  
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Westinghouse CA-5 Specifications

General

Type	Electromechanical Relay
Category	General Purpose Relay
Function	Switching
Operating Temperature Range	-40°C to +70°C
Contact Form	DPDT
Contact Rating	10A at 250VAC
Coil Voltage	12VDC
Electrical Life	100, 000 cycles
Mechanical Life	10, 000, 000 operations

Summary

APPLICATION

Transformer Relay

Requirements for transformer differential protection.

Generator Relay

CONSTRUCTION

Percentage Differential Unit

Description of the differential unit's construction and operation.

Indicating Contactor Switch Unit (ICS)

Indicating Instantaneous Trip Unit (IIT) (When Supplied)

OPERATION

Trip Circuit

CHARACTERISTICS

SETTING THE RELAY

Generator Differential Relay

Transformer Differential Relay

INSTALLATION

ADJUSTMENTS AND MAINTENANCE

Receiving Acceptance

Differential Unit

Testing procedures for the differential unit's minimum pickup and slope.

Indicating Instantaneous Trip Unit (ITT) (When Supplied)

Routine Maintenance

Repair Calibration

Clearance

Contacts

Minimum Pickup

Adjustment of spiral spring for minimum pickup current.

Percentage Slope Characteristic

Checking operating current for percentage slope curve.

Indicating Contactor Switch (ICS)

Indicating Instantaneous Trip Unit (ITT) (Where Used)