The "LTB" series is a global standard for high-voltage substations, appreciated by utility engineers for its "puffer" breaking principle, which requires less energy to operate.
Easy to transport and assemble on-site; individual poles can be serviced independently.
When a manual is lost and the manufacturer is out of business or unresponsive:
Use only manufacturer-recommended SF6 gas and filling kit. Moisture or air contamination reduces dielectric strength.
The poles are permanently filled with SF6 gas, which acts as both an insulator and an arc-extinguishing medium. Installation & Assembly Guidelines Mechanical Connection: ltb 72.5-170d1 b manual
breakers rely entirely on mechanical spring energy to compress gas and extinguish electrical arcs. The LTB D1/B design implements . During high-current faults, the heat generated by the electric arc expands the gas trapped inside a fixed volume chamber, naturally driving up internal pressure.
: -30 °C to +40 °C (standard configurations support down to -60 °C or up to +70 °C). Mechanical Endurance : 10,000 operations without load. Standard Duty Cycle : Core Design Features & The Auto-Puffer™ Principle
** DISTRIBUTION:** Special
piping manifolds linking all poles to the central diagnostic block. The "LTB" series is a global standard for
In case of motor failure, the spring can be charged manually using a handle. 4. Installation and Commissioning Guidelines
Preventive maintenance checks and services (PMCS) means keeping a close watch on your equipment's condition. Keep your equipment in good condition and always ready for its primary use. You must keep a record of when you operators and crew must perform PMCS. **Table 3-1. Operator/Crew PMCS" Interval Item No. Item to be checked or serviced Procedure Not fully serviceable **If the equipment must be kept in use, the corrected record of when you operators and crew must perform PMCS." **3-3. CLEANING} Keep the trailer clean. Wash with water and mild soap. Do not use harsh chemicals or solvents (like gasoline or acetone) that can damage the components or finish. **3-4. PAINTING} If the paint is chipped or rust is spotted, clean to bare metal and apply an anti-rust primer and paint to protect the metal. Follow the unit SOP for painting.
Route all operation and signal cables through the connection flange at the bottom of the mechanism housing. Initial Charging:
This equipment is , but a series of live tank, SF₆ circuit breakers (Live Tank Breaker, LTB) manufactured first by ABB and now by Hitachi Energy. Designed for nominal voltages from 72.5 kV up to 170 kV, it is engineered to interrupt short-circuit currents of up to 40 kA under extreme environmental conditions. Moisture or air contamination reduces dielectric strength
Because sulfur hexafluoride is a potent greenhouse gas, the manual dedicates exhaustive sections to environmental safety, handling protocols, and gas density testing.
SF6 gas with a double O-ring sealing system to prevent leakage. Key Design Features
| Parameter | Value | | :--- | :--- | | | 72.5 – 170 kV | | Rated Continuous Current | Up to 3150 A | | Rated Short-Circuit Breaking Current | Up to 40 kA | | Rated Frequency | 50/60 Hz | | Number of Breaks Per Pole | 1 | | Operating Mechanism Type | BLK 222 (Spring-operated) | | Closing Time | < 65 ms | | Opening Time | 22 ms | | Break Time | 40 ms | | Short-circuit Duration | 3 s |
This guide is based on the official ABB "Product Description" (document number 1HSB425455-30) and aims to provide a consolidated overview of its contents. It integrates critical information from the official product description, including construction, gas systems, operating mechanisms, and standards.
Section I. Introduction Section II. Integral Components of End Item Section III. Basic Issue Items Section II. Integral Components of End Trailer, Low Bed, 72.5-Ton, M172A1 Section III. Basic Issue Items **Appendix C - ADDITIONAL AUTHORIZATION LIST" Appendix D - EXPENDABLE/DURABLE SUPPLIES AND METRIALS LIST Appendix E - EXPENDABLE/DURABLE SUPPLY AND MATERIALS LIST Repetitive text is removed. the text "ltb 72.5-170d1 b manual" is not standard.
Did your manual end up in the trash? Here are the solutions to the top three problems users face with this type of hardware: