Start-Up; Switching Operations; Withdrawable Apparatus - ABB UniGear ZS1 Instruction Manual

6.2 Switching operations

• On motorized withdrawable parts, check the direction of rotation of the travel motor in accordance
with section 7.5.4;
• For any other matters regarding operation of the withdrawable circuit-breaker part and testing
facilities for the withdrawable part, see section 7.5;
• Instruct local operators regarding the basic details of regular handling of the switchgear;
• Check readiness for operation and switching status of electrical systems upstream and downstream
of the switchgear.
Depending on allocation of responsibilities, it may also be necessary to check the following equipment
in areas adjacent to the switchgear:
• power cables;
• auxiliary cables;
• auxiliary power source;
• remote control system;
• complete earthing system;
• switchroom equipment;
• switchroom conditions.

6.1.2 Start-up

• Comply with all relevant safety regulations;
• Ensure that the circuit-breakers in the system are in the OFF position;
• Remove any existing earthing and short-circuiting connections in the critical switching area;
• Energize the feeder cables;
• Connect the switchgear step by step, observing the signals and indicators;
• Check that relative conductors are in phase, where necessary, when there are several incoming
feeder cables and switchgear sections (also see section 6.3.2);
• Carry out all measurements and check all functions which depend on high voltage power supply
being connected;
• Watch out for irregularities of any kind.
Carry out switching operations with the front doors closed!

6.2.1 Withdrawable apparatus

Manual insertion from the test/disconnected position to the service position:
• Connect control wiring plug 10.2 (figure 111);
• Close the front door;
• Ensure that the apparatus is in the OFF position;
• Before inserting the hand crank, it is necessary to open the hole for it - turn the slide 121.1 (figure
112) by means of the key 145;
• Fit hand crank 121 (figure 113) on square spigot 18.1 (figure 10) of the spindle mechanism 18, after
opening the hole for them by turning slide 121.1;
• Turn the crank clockwise (approx. 20 turns at 12/17.5kV and 30 at 24 kV) until the stop is reached
and the withdrawable part is in the service position;
• Observe the position indicator;
• Remove hand crank 121.
It must be considered that the spring loaded pin head 18.2 (figure 10) will lie completely on the rear
side of the panel door when the hand crank is moved from square spigot 18.1 of spindle mechanism
18. This ensures that the rear part of the pin head has been shifted onto the hexagonal cap of the spindle
and prevents unintentional wrenching of the spindle during panel service. Wrenching may lead to the
circuit-breaker blocking.
69