Primary Circuit Resistance Check; Mechanism Check; T" Contact Wipe Indicator Example With Blue Spring; Wipe Indication Procedure - Eaton Cutler-Hammer DHP-VR Series Instructions For Installation, Operation And Maintenance

Instruction Book
Page 38 Effective: March 2007
Figure 6-4 "T" Contact Wipe Indicator Example with Blue
Spring (if the "T" or any portion of it is visible as shown with
the breaker closed, the wipe is satisfactory, See Next Figure
for Graphic of Al Possibilities)
minute. Successful withstand indicates satisfactory
insulation strength of the secondary control circuit.
Remove the shooting wire and reconnect the motor
leads.

6-8 PRIMARY CIRCUIT RESISTANCE CHECK

Since the main contacts are inside the vacuum chamber
they remain clean and require no maintenance at any
time. Unlike most typical circuit breaker designs, DHPVR
breakers do not have sliding contacts at the moving stem
either. Instead they use a highly reliable and unique
flexible clamp design that eliminated the need for
lubrication and inspection for wear.
If desired, the DC resistance of the primary circuit may be
measured as follows: close the breaker, pass at least 100
amps DC current through the breaker. With the low
resistance instrument, measure resistance across the
studs on the breaker side of the disconnects for each
pole. The resistance should not exceed 60, 40, 20
microohms for 1200, 2000, and 3000 amps respectively.

6-9 MECHANISM CHECK

Make a careful visual inspection of the mechanism for
any loose parts such as bolts, nuts, pins, rings, etc.
Check for excessive wear or damage to the breaker
components. Operate the breaker several times
manually and electrically. Check the closing and opening
times to verify that they are in accordance with the limits
in Table 5.1.
Courtesy of NationalSwitchgear.com
Figure 6-5 Wipe Indication Procedure (Performed Only with
Breaker Closed)
For more information visit: www.EatonElectrical.com I.B6513C80G