VS1i-12 Intelligent Vacuum Circuit Breaker

VS1i-12 intelligent medium-voltage vacuum circuit breaker is a new type of vacuum circuit breaker developed by combining traditional vacuum circuit breaker and ‘intelligent switch equipment comprehensive monitoring device’. It adopts a new modular mechanism, ensuring stable operation and simple maintenance.

The smart circuit breaker collects data from various sensors to the intelligent processor,which integrates switch mechanical characteristics, temperature data collection, and analysis functions. The display terminal performs on-site analysis of mechanical faults, temperature rise prediction alarms, and edge computing for on-site diagnostics. It supports human-machine interaction, providing strong safeguards for safe equipment operation.

Type designation

Operating conditions

1. Ambient Temperature: Maximum temperature: +40ºC, with an average not exceeding 35ºC within 24 hours, Minimum temperature: -20ºC.

2. Relative Humidity: Daily average relative humidity: ≤95%, Monthly average relative humidity: ≤90%, Daily average vapor pressure: ≤2.2 kPa, Monthly average vapor pressure: ≤1.8 kPa.

3. Altitude: Not exceeding 2000m.

4. Seismic Intensity: Not exceeding 8 degrees.

5. The surrounding air is not significantly affected by dust, smoke, corrosive, or flammable gases, vapors, or salt spray contamination.

Features

1. The arc extinguishing chamber and operating mechanism of the circuit breaker are arranged in a front-to-back configuration and connected as a whole through a transmission mechanism.

2. The hermetically sealed pole adopts epoxy resin insulation material to seal the vacuum arc extinguishing chamber and the main circuit conductive components as a whole.

3. The vacuum arc extinguishing chamber utilizes a hermetically sealed pole, enhancing the product’s ability to withstand environmental pollution.

4. The operating mechanism adopts a spring-stored energy design, providing both electric and manual energy storage functions.

5. It features an advanced and rational buffer device, ensuring no rebound during disconnection and reducing disconnection impact and vibration.

6. It has advantages such as simple assembly, high insulation strength, high reliability, good product consistency, and maintenance-free operation.

7. The mechanical lifespan can reach up to 20,000 operations.

Technical data

Technical datas are shown in Table 1

Table 1
ltem	Unit	Data
Rated voltage	KV	12
Rated frequency	HZ	50
1min	KV	12
Rated lightning impulse withstand voltage peak	KV	75
Rated current	A	630	1250	1600	2000	2500	3150	4000
Rated short-circuit breaking current Rated thermal stable current (effective value)	KA	20	20	/	/	/	/	/
		25	25	/	/	/	/	/
		31.5	31.5	31.5	31.5	31.5	/	/
		/	40	40	40	40	40	40
Rated short-circuit making current (peak value) Rated dynamic stable current (peak value)	KA	50	/	/	/	/	/	/
		63	63	/	1	1	/	/
		80	80	80	80	80	/	/
		1	100	100	100	100	100	100
Rated short-circuit breaking current breaking times	Times	3,050
Rated thermal stability time	S	4
Rated operating sequence		Opening -0.3s-closing and opening -180s-closing and opening /Opening-180s- closing and opening -180s-closing and opening
Mechanical life	Times	30000
Rated singlcapacitor bank breaking current	A	630
Rated back to back capacitor bank breaking current	A	400
Note:
When the rated current is 4000A,the switchgear must be equipped with forced air cooling.
When the rated short-circuit breaking current is ≤31.5kA,the rated short-circuit breaking times are 50. When the rated short-circuit breaking current is ≥31.5kA,the rated short-circuit breaking times are 30.
When the rated short-circuit breaking current is ≥40kA,the rated operation sequenceis:Open-180s-Close Open-180s-Close Open.

The mechanical characteristic parameters of the circuit breaker are shown in Table 2

Contact distance	mm	9±1
Contact travel	mm	3.5±0.5
Three phase opening asynchrony	ms	≤2
Contact closing bounce time	ms	≤2(for 1600A and below),≤3(for 2000A and above)
Average opening speed (contact separation -6mm)	m/s	1.1±0.2
Average closing speed (6mm~contact closed)	m/s	0.7±0.2
Opening time	ms	20~50
Closing time	ms	30~70
Allowable cumulative thickness of wear for moving and stationary contacts	mm	≤3
Main electrical circuit resistance	μΩ	≤50(630A) ≤45(1250~1600A) ≤30(2000A) ≤25(2500~4000A)

Opening and closing coil parameters are shown in Table 3

	Closing coil		Opening coil		Locking solenoid		Anti-trip relay
Rated operating voltage (V)	DC220	DC110	DC220	DC110	DC220	DC110	DC220,DC110
Coil power (W)	242	242	151	151	3.2	3.2	1
Rated current	1.1A	2.2A	0.7A	1.3A	29mA	29mA	9.1mA
Normal operating voltage range	85%-110%rated voltage		65%-120%rated voltage		65%-110%rated voltage

The permanent magnet single-phase DC motor is used, and the operating voltage is allowed to use AC and DC power sources. The technical data are shown in Table 4