SF6 Gas Column Circuit Breakers ВГТ-УЭТМ®-330

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 330 kV.

• The circuit breakers are made in climatic versions of U and HL *, placement category 1 GOST 15150-69 and GOST 15543.1-89. They are intended for operation in open and closed switchgears in areas with a temperate and cold climate in the open air:

- The upper working value of the temperature of the surrounding air switch is plus 40o C;

- The lower operating temperature of the ambient air switch is:

а)  For version U1 (rated breaking current 31.5 kA or 40 kA) - minus 45 ° С when the circuit breaker is filled with SF6 gas;

б) For U1 version (rated breaking current 50 kA) - minus 50 ° С when filling the circuit breaker with gas mixture (SF6 gas and tetrafluoromethane CF4);

в)  For HL1 * version  (rated breaking current 31.5 kA or 40 kA) - minus 52 ° С when filling the circuit breaker with gas mixture (SF6 gas and tetrafluoromethane CF4).

• The circuit breakers consist of three mechanically unrelated core-type poles, each of which is controlled by its own motor-spring drive type PPV-UETM ®.
• High factory readiness, simple and quick installation and commissioning..
• Natural leakage rate - no more than 0.5% per year.
• Maintaining the electrical strength of the insulation of the circuit breaker 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 mechanical resource or a synchronous switch control device with a switching resource metering function.
• Possibility of supplying distribution cabinet.

№	Parameters	ВГТ-УЭТМ®-330
1	Rated voltage, kV	330
2	Max operating voltage, kV	363
3	Rated current, A	4000
4	Rated breaking current, kA	40
5	Rated aperiodic component, %, maximum	47
6	Rated through short-circuit current, kA:
	Peak (electrical endurance);	100
	Root-mean-square current value during its flow (thermal stability current);	40
	Thermal stability current time, s.	3
7	Rated parameters of making current, kA:
	Peak;	100
	Initial value of periodic component.	40
8	Commutation of capacitive current (class С1):
	Rated commutation current of unloaded air line, А;	315
	Rated commutation current of cable line, А;	355
	Rated commutation current of single capacitor bank, А.	400
9	Rated breaking current of shunt reactor, А	315±63
10	Minimum breaking current of shunt reactor, А	100±20
11	Own breaking time, s	0,018…0,025
12	Total breaking time, s	0,050
13	Own making time, s, max	0,070
14	Diversity of poles operation, s, max
	At making	0,005
	At breaking	0,0033
15	Annual gas leakage rate, % of gas mass, max	0,5
16	Test lightning impulse, kV: To earth / between open contacts	1175   / 1380
17	Test commutation impulse voltage, kV: To earth / between open contacts	950   / 1245
18	Testing one-minute voltage of commercial frequency, kV: To earth / between open contacts	560 /750
19	Rated DC voltage of the drive control magnets, V	110 или 220
20	Number of control magnets:
	making	1
	breaking	2
21	Breaking current of commutation contacts for auxiliary circuits (drive)	14НО + 14НЗ + 2 проскальзывающих
22	Spring wind up motor power for making springs, kW	2х1,175
23	Rated voltage of motor of making springs, V	=110, = 220 или ~230
24	Time of making springs winding up, s, max	15
25	Rated capacity of drive heaters, W:
	Continuous anti-condensate heating;	50
	Main heating automatically turns up at lower temperature	600
26	AC voltage of feeding heaters, V	230
27	Max. vertical dynamic force on the foundation of 1 of 4 supports of the pole at CB operation (w/o own weight), kN:
	upward		55,4
	downward		41,9
28	Max static load on  the foundation of 1 of 4 supports of the pole , kN		8,8
29	Circuit breaker’s weight w/o metal supports, kg, maximum		9700

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 - 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: 15 operations

At the current 60 % of the rated breaking current: 26 operations

At the operating currents equal to 3150A: 5000 operations «Making-random pause-breaking».

At the operating currents equal to 4000A: 1700 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

Versions Т1 and У1	Version ХЛ1*
Filling pressure (nominal)	0,5	0,7
Warning alarm pressure	0,44	0,62
Locking pressure	0,42	0,6

6. Weight of gas required for filling circuit breaker, kg

Versions Т1 and У1	Version ХЛ1*
SF6 gas	SF6 gas	Tetra fluorine methane
ВГТ-УЭТМ®-330	53,0	37,4	21,0