72.5kV SF6 Dead Tank Circuit Breaker

72.5kV SF6 Dead Tank Circuit Breaker 3 pole operated according to ANSI/IEEE
and IEC standards for outdoor installation with mechanical spring operating mechanism
including support structure.
Type DT1-72.5 F1 FK
Rated maximum voltage 72.5 kV
Operating voltage 69 kV
Frequency 50 Hz
Rated continuous current 2000 A
Rated breaking current 40 kA
BIL 350 kV
Insulating medium SF6
High-speed auto-reclosure 3 pole operated
Temperature range -30C up to +40C
Current transformers see page 10

CHARACTERISTICS of the DT1-72.5 F1 FK

Three (3) Pole SF6 Dead Tank Circuit Breaker 3 pole operated according to ANSI/IEEE and
IEC standards for outdoor installation with mechanical spring operating mechanism
Type DT1-72.5 F1 FK
Rated maximum voltage 72.5 kV
Operating voltage 69 kV
rated frequency 60 Hz
rated normal current 2000 A
rated short circuit breaking current 40 kA
BIL 350 kV
Low frequency withstand 160 kV
rated duration of short circuit 3 s
rated break time 3 cycles
ambient air temperature range -30ºC up to +40ºC
altitude above sea level not exceeding 1000 m
bushing creep 71.4 inches
seismic withstand 0.5g

Features of the Circuit Breakers

* Interrupter tanks are high strength, single cast aluminum
* Suitable for three (3) phase auto-reclosing
* Color of porcelain bushings: brown
* Protection class: NEMA 4X RAL 6001 green painted aluminium control and mechanism
cabinet
* SF6 gas for the first filling is included in this item.
* SF6 density monitor with color scale
* Anchor bolts are not included and to be provided by others
Features of the Spring Operating Mechanism
* Operating voltage of trip/close coils 125 VDC
* One DC motor per operating mechanism 125 VDC
* Alternate current circuit (heater, cabinet lighting) 230 VAC
* Anti-pumping device
* Anti-condensation heater with thermostat
* SF6 density control included
* Two (2) independent trip coils, one (1) closing coil
* Local mechanical and electrical C/O operation
* Motor protection with MCB included
* Aluminum access plate undrilled
* Removable door of housing with provisions for padlocks
* Breaker position and spring charge indicators included

Accessories included in this offer:

* Breaker control via pushbutton
* Local/remote switch
* Loss of DC and AC power relays
* Motor trouble time out relay
* Hygrostat
* Indicator lights
* Cabinet light and internal power outlet
* MCB switch protection for control and monitoring circuits
* Ground terminal connectors

Features of the Bushing Current Transformers (BCT’s)

* Each of the breakers has the following BCT’s:
     o Line & load sides
          2 pcs per bushing – Cl 1.0
          1 pc per bushing – 5P20.
* IEEE C57.13 standard
* Each core of each single-phase current transformer is magnetically independent.
* Costs associated with the type testing of the BCT’s are not included in the breaker pricing.
* Actual tap arrangements are to be confirmed by the end user at time of order placement.
* All accuracy classes, thermal and mechanical ratings shown are at the maximum ratio unless
specified otherwise.