Installation Checks And Initial Functional Tests; Introduction; Inspections, Checks And Tests Without Control Power; Spring Discharge Check (Figure 1) - Siemens 3AH Installation Operation & Maintenance

Installation Checks and Initial Functional Tests

Introduction

This section provides a description of the inspections,
checks and tests to be performed on the circuit breaker
module only.

Inspections, Checks and Tests without Control Power

Vacuum circuit breakers are normally shipped with their
primary contacts open and their springs discharged. How-
ever, it is critical to first verify the discharged condition of
the spring-loaded mechanisms after de-energizing control
power.

Spring Discharge Check (Figure 1)

Perform the Spring Discharge Check before removing
the circuit breaker from the pallet or removing it from the
switchgear.
The spring discharge check consists of simply performing
the following tasks in the order given. This check assures
that both the opening and closing springs are fully dis-
charged.
Hazardous voltages and high-speed
moving parts.
Will cause death, severe personal injury, or
property damage.
Read instruction manuals, observe safety
instructions and use qualified personnel.
1. Press red Open pushbutton.
2. Press black Close pushbutton.
3. Again press red Open pushbutton.
4. Verify Spring Condition Indicator shows DISCHARGED.
5. Verify Main Contact Status Indicator shows OPEN.

Manual Spring Charging Check

1. Insert the manual spring charging crank into the manual
charge handle socket as shown in Figure 1. Turn the
crank clockwise until the spring condition indicator
shows the closing spring is Charged.
2. Repeat the Spring Discharge Check.
3. Verify that the springs are discharged and the circuitbreak-
er primary contacts are open by indicator positions.
As-Found and Vacuum Check Tests - Perform and record the
results of both the As-Found insulation test and the vacuum
check high-potential test. Procedures for these tests are
described in the Maintenance Section of this manual.

Automatic Spring Charging Check

Note: A temporary source of control
power and test leads may be required if the control power
source has not been
Figure 1. Front Panel Controls of Circuit Breaker and
Manual Charging of Closing Spring
connected to the switchgear. Refer to the specific wiring
information and rating label for your circuit breaker to de-
termine the voltage required and where the control voltage
signal should be applied. When control power is connected
to the circuit breaker, the closing spring should automati-
cally charge.
The automatic spring charging features of the circuit breaker
must be checked. Control power is required for automatic
spring charging to take place.
1. Open control power circuit by opening the control power
disconnect device.
2. Energize (close) the control power circuit disconnect.
3. Use the Close and Open controls (Figure 1) to first Close
and then Open the circuit breaker contacts. Verify
contact positions visually by observing the Open/Closed
indicator on the circuit breaker.
4. De-energize control power by repeating Step 1. Discon-
nect the plug jumper from the switchgear first and next
from the circuit breaker.
5. Perform the Spring Discharge Check again. Verify that
the closing spring is discharged and the primary con-
tacts of the circuit breaker are open.

Final Mechanical Inspections without Control Power

1. Make a final mechanical inspection of the circuit breaker.
Verify that the contacts are in the open position, and the
closing spring is discharged.
2. Verify mechanical condition of springs.
3. Check for loose hardware.
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