SF6 Gas Column Circuit Breakers ВГТ-УЭТМ®-1А1-220

The circuit breaker is designed for switching electrical circuits under normal and emergency modes, as well as operating in automatic recloser cycles in three-phase AC 50 Hz networks with a rated voltage of 220 kV.

• The circuit breakers are made in climatic versions of U and HL *, placement category 1 GOST 15150-69 and GOST 15543.1. They are designed for operation in open and closed switchgear in temperate and cold climates.
• The lower operating value of the ambient air switch temperature is: for version U1 - minus 45 ° С when filling the switch with gas, for version HL1 * - minus 55 ° С when filling the circuit breaker with gas mixture.
• The upper working value of the temperature of the surrounding air switch is +40 ° C.
• By request delivery in a climatic modification T1 is possible - the top working value of air temperature is +50 ° C.
• Triple pole design: three poles (speakers with a one-shot arcing device) are placed on a common frame and are controlled by a single high-power spring drive.
• High factory readiness, simple and quick installation and commissioning.
• Natural leakage rate - no more than 0.5% per year.
• Ability to disconnect the load current 3150 A with loss of gas overpressure.
• Maintaining the electrical strength of the insulation of the switch when the voltage is equal to 1.15 of the highest phase voltage in the event of loss of excess gas pressure in the circuit breaker.
• Disconnection of capacitive currents without repeated breakdowns, low overvoltage.
• Low noise when triggered - meets high environmental requirements. 
• Possibility of supplying a switching resource metering device or a synchronous switch control device with a switching resource metering function (for single-pole performance).
• Possibility to supply distribution cabinet (for single pole version).

2. Cycles and Operations of Circuit Breakers:

Breaking (О);

Making (В);

Making-breaking (ВО) including – without intended delay between operations (В) and (О);

Breaking - making (ОВ) at any contact-free pause;

Breaking – making - breaking (ОВО) with intervals between operations according to items 3 & 4;

Commutation cycles:

О - 0,3с  – ВО - 180с - ВО;

О - 0,3с  – ВО - 20с - ВО;

О - 180с – ВО - 180с – ВО.

3. Permissible breaking operations number for each pole without review and maintenance of arc chutes (commutation stability lifespan) at short-circuit currents and load currents:

At the current 100% of the rated breaking current: 17 operations

At the current 60 % of the rated breaking current: 45 operations

At the operating currents equal to the rated current: 5000 operations «Making-random pause-breaking».

Permissible number of making operations for short-circuit currents should be not more than 50% of the permissible breaking operations; permissible making operations at load currents is equal to permissible breaking operations.

4. Reliability of Circuit Breakers:

Mechanical strength before overhaul maintenance: 10000 operations «Making –random pause - breaking» with no current in the main circuit;

Lifespan before the first maintenance at least 25 years, provided that mechanical strength or communication stability life was not spent. Maintenance necessity is judged by diagnostics of the circuit breaker technical condition;

Circuit breaker lifespan before retirement at least 40 years.

5.  Absolute pressure of gas brought to temperature plus 20°С, MPa

6. Gas weight required for filling a circuit breaker, kg