Dead Tank Circuit Breakers - Dtb With Hydraulic Spring Operation Mechanism Hmb

ABB designs and manufactures with latest technology dead tank circuit breakers [DTB] in a complete range of configurations. Dead Tank circuit breakers with hydraulic spring operation mechanism HMB are either of PMI breakers or PMR breaker are consists of three cast aluminum tanks containing interrupter units that are mounted on a single support frame. This type of DTB are available in various models like 72 kV Type PMI, 242 kV Type PMG, 145 kV Type PMI, 242 kV Type PMI, 145 kV Type PM63-B, 242 kV Type PMR, 362 kV Type PMI, 242 kV Type PMRI and 550 kV Type PM. Salient features of DTB with hydraulic spring operation mechanism HMB are as follows:

1 ASME pressure vessel certification for unfired pressure vessels
2 3-cycle interrupting time
3 HMB-1.8 hydraulic spring operating mechanism [ref. 33-901B]
4 Single self-blast interrupter per phase
5 Three tank construction
6 Exterior bushing current transformers
7 Control cabinet houses the mechanism, current transformer terminal blocks and the electrical control components
8 Porcelain or composite bushings that meet or exceed all applicable ANSI and NEMA design specifications
9 Isolated gas systems provided per pole with mini-gas monitor and pressure gauge
10 Meets or exceeds ANSI and IEC standards