Trip circuit Monitor on a circuit with a lighted nameplate lockout
Trip circuit Monitor on a circuit with a lighted nameplate lockout
(OP)
Has anyone sucessfully been able to apply a trip circuit monitor on a circuit with a lighted nameplate lockout?
The problem dosen't seem to be in the reset state of the lockout, but in the tripped state there is an interaction between the lighted nameplate and the trip circuit monitor.
The issue is that someone had this wonderful idea to place the lockout in a 35 kV switchgear, but the transformer differential relay was placed in the control building. The lighted nameplate trip coil monitor monitors the trip coil, but leaves much of the circuit without monitor. The trip circuit monitor monitors a greater part of the circuit. During testing it was found that the two monitors interact while the lockout is triped. This interaction was on the order of several thousand outputs of the trip circuit monitor a miniute.
I have contacted both venders, and nether were helpful in providing a solution. The lockout out vender has really made my list, because i had contacted then prior to the instalation, and they did not have time to discuss it with me. And after the instalation they have provided very little (OK they had a huracane, but they appear to have a sustanability problem also).
Any ideas to a solution?
This is a utility application, and the schematics are very utility common.
The problem dosen't seem to be in the reset state of the lockout, but in the tripped state there is an interaction between the lighted nameplate and the trip circuit monitor.
The issue is that someone had this wonderful idea to place the lockout in a 35 kV switchgear, but the transformer differential relay was placed in the control building. The lighted nameplate trip coil monitor monitors the trip coil, but leaves much of the circuit without monitor. The trip circuit monitor monitors a greater part of the circuit. During testing it was found that the two monitors interact while the lockout is triped. This interaction was on the order of several thousand outputs of the trip circuit monitor a miniute.
I have contacted both venders, and nether were helpful in providing a solution. The lockout out vender has really made my list, because i had contacted then prior to the instalation, and they did not have time to discuss it with me. And after the instalation they have provided very little (OK they had a huracane, but they appear to have a sustanability problem also).
Any ideas to a solution?
This is a utility application, and the schematics are very utility common.






RE: Trip circuit Monitor on a circuit with a lighted nameplate lockout
RE: Trip circuit Monitor on a circuit with a lighted nameplate lockout
I was looking at using a latch function to fix the output during these osolations, but I am still troubled with the unlatch part.
If there is a moral to this, put the relay with the lockout.
RE: Trip circuit Monitor on a circuit with a lighted nameplate lockout
RE: Trip circuit Monitor on a circuit with a lighted nameplate lockout
RE: Trip circuit Monitor on a circuit with a lighted nameplate lockout
Andy
RE: Trip circuit Monitor on a circuit with a lighted nameplate lockout
The 387 relay has a fixed input pickup voltage, which is being picked up by the trip signel indacator LED.
No one said, but I expect that as the SEL input voltage goes up and down, so does the voltage on the trip indicator LED.
The engineer that decided to make this sepration of the lockout and relay has retired, and good ridence.