ABB AMVAC Technical Manual page 11

Dimensions for 5 kV & 15 kV Breakers
Option: Two normally open 'a' and normally close 'b' contacts located on
Contact factory for 27 kV Breakers
the electronic controller shall be furnished. These 'dry' contacts change state
as the circuit breaker main contacts change state.
The circuit breaker shall have a flag to indicate open or closed position. An
indicating light will illuminate when the stored energy system has sufficient
energy for circuit breaker change of state. During the capacitor charging
function, a green 'Ready' indicating light blinks until full capacitor charge; it
remains on continuously when full capacitor charge is achieved. Capacitors
shall hold their charge for up 60 to 90 seconds after control power loss. A
user-selectable loss of control power trip function shall be offered to pro-
vide trip on loss of control power.
The circuit breaker shall have a flag to indicate open or closed position. An
indicating light will illuminate when the stored energy system has sufficient
energy for circuit breaker change of state.
During the capacitor charging function, a green 'Ready' indicating light blinks until full capacitor charge; it remains on continuously
when full capacitor charge is achieved. Capacitors shall hold their charge for up 60 to 90 seconds after control power loss. A user-
selectable loss of control power trip function shall be offered to provide trip on loss of control power.
Option: Capacitor 'Ready' and 'Not Ready' dry-type contacts shall be provided for monitoring stored energy status by remote
SCADA systems.
The circuit breaker shall feature a capacitor discharge function to fully discharge the stored energy capacitors before removal from
the switchgear. A flashing red indicator inside the close pushbutton shall signal capacitor discharge.
The circuit breaker shall have a five-digit, non-resetting operation counter clearly visible from the front of the breaker. The operation
counter shall advance when the circuit breaker opens.
An electronic controller shall be provided for controlling capacitor charging, switching capacitor energy to the closing or opening
coils, providing the anti-pumping feature, and a full range of user-selectable functions. Proximity sensors shall be connected to the
electronic controller to sense magnetic actuator armature position. The electronic controller shall also incorporate user-selectable
instantaneous or time delay undervoltage that trips the circuit breaker when the control power falls to a value that is 30-60% of
nominal voltage. Electronic controllers shall be universal AC/DC devices allowing either 24 - 60 VAC or VDC or 110 - 250 VAC or
VDC control power flexibility. The electronic controller shall include a user selectable function to automatically trip the circuit break-
er should the electronic controller microprocessor fail. 'Watchdog' functions shall reset the microprocessor automatically to maintain
trip and close capability. The electronic controller shall also include a user selectable function to automatically trip the circuit breaker
in response to declining capacitor voltage.
Option: A normally open dry contact shall be wired to the secondary disconnect providing contact closure to signal that a 'fleeting'
trip signal was received by the electronic controller.
Option: Electronic controller shall have user-selectable instantaneous and time delay undervoltage that shall cause the circuit breaker
to open when the control power falls to a value that is 30-60% of the nominal control voltage. Time delays of 0.050, 0.5, 1.0, 2.0,
3.0, 4.0, or 5.0 seconds may be selected.
Option: To prevent unintentional operation of the circuit breaker in the 'Connected' position, the electronic controller shall be
equipped with a Close Blocker feature to electronically prevent local or remote actuation of close function.
Current Path
Each primary lead assembly shall consist of a vacuum interrupter completely embedded in an epoxy resin casting. The epoxy casting
shall encapsulate not only the vacuum interrupter, but also the upper and lower current carrying parts and current transfer assembly.
The epoxy casting shall limit access to any moving parts, protecting them from dirt and debris. Epoxy encapsulation shall be used on
all 1200 and 2000 ampere circuit breakers. The 3000 ampere circuit breakers shall use individual ventilated pole assemblies that shield
and protect the vacuum interrupters. Connecting directly to the pole pads, silver-plated copper upper and lower leads shall use tulip-
type self-aligning primary disconnects. A dedicated ground contact shall be provided to engage the stationary ground contact in the
circuit breaker compartment to ground the circuit breaker in all positions from "Disconnected"
through "Connected".
Maintenance and Handling
The magnetic actuator mechanism shall be front-accessible. No routine lubrication of the magnetic actuator mechanism shall ever be
required.
Routine inspections shall be performed with the breaker in the upright position. Circuit breakers shall have self-contained wheels
designed for easy insertion, removal and transport on flat indoor surfaces.
11