1. Products Description

LTZ-40.5 indoor SF6 circuit breaker is an indoor device used in AC 50Hz three-phase power system. It can be used in industrial and mining enterprises, power plants and substations for the control and protection of electrical equipment, and can be used in places where frequent operation is required, and can be used as a liaison circuit breaker and suitable for capacitor bank circuit breaker, and is a more ideal oil-free circuit breaker in the power system.

2. Use of environmental conditions

a. Altitude: not more than 1000m;

b.Ambient temperature: -15℃～40℃;

c.Relative air humidity: daily average not more than 95%, monthly average humidity not more than 90%;

d. Environmental conditions: no fire, explosion hazard, serious filth, chemical corrosion and severe vibration occasions;

Note: beyond the above requirements, can be negotiated by the user and the manufacturer.

3. Model and meaning

sf6

4. Main features of the product

Strong breaking capacity: SF6 circuit breaker completes arc blowing by blowing out SF6 gas, its arc blowing speed is fast, arc burning time is short, and the breaking current is large, which can effectively protect the safety of medium and high voltage circuits. SF6 circuit breaker after disconnecting capacitive or inductive current, there is no danger of re-ignition and re-ignition.
Long electrical life: SF6 circuit breaker has a long service life, long overhaul cycle, and can adapt to frequent operation within a short period of time, with good safety and durability.
High insulation level: SF6 circuit breaker is using sulphur hexafluoride gas as insulation medium, the insulation level of this gas is extremely high.
Modular operation mechanism: SF6 circuit breaker adopts the modular spring operation mechanism which is independently developed by our company and adapted to the market popularity, which has good mechanical performance and convenient and quick maintenance in the later stage.

5. Main technical parameters

Table 1 Main Performance Parameters of Circuit Breakers

S.N	Item name			Unit	Parameter
1	Rated voltage			kV	40.5
2	Rated insulation level	Lightning Impact Withstand Voltage			185(Interphase, to ground) 215(fracture)
		Power frequency withstand voltage(1min)			95
3	Rated frequency			Hz	50
4	Rated current			A	630	1250
5	Rated short circuit breaking current			kA	31.5
6	Rated operating sequence				O-0.3s-CO-180s-CO
7	Rated short circuit making current(peak)			kA	80
8	Rated peak withstand current (rated dynamic stability current)				80
9	Rated short-time withstand current (rated thermal stability current)			kA	31.5
10	Rated short-circuit duration (rated thermal stabilisation time)			s	4
11	Opening and closing individual capacitor bank current			A	400
12	Rated out-of-step breaking current			kA	6.3
13	Cumulative number of openings at rated short-circuit breaking current			times	8
14	Cumulative number of openings at rated current			times	3000
15	mechanical life			times	10000
16	Rated pressure of sulphur hexafluoride gas (gauge pressure at 20°C)			MPa	0.65
17	Sulphur hexafluoride gas blocking pressure (gauge pressure at 20°C)				0.59
18	Annual air leakage rate			%/year	≤1
19	Sulphur hexafluoride gas moisture content (at 20°C)			ppm (V/V)	≤150
20	Rated operating voltage			V	AC/DC: 110/220
21	Weight		circuit breaker body	kg	130
			Sulphur hexafluoride gas		1.5

Table 2 Assembly adjustment parameters for circuit breakers

S.N	Item name	Unit	Data
1	Total travel of the conductive rod	mm	61±2
2	contact opening distance	mm	40±2
3	overstroke	mm	20±2
4	Closing time	ms	40≤t≤100
5	Opening time	ms	25≤t≤60
6	Closing bounce	ms	≤2
7	Opening bounce	mm	≤2
8	Rigid closing speed(18-0mm)	m/s	2.1±0.2
9	Rigid opening speed(0-18mm)	m/s	2.3±0.2
10	Three-phase switching and closing non-simultaneity	ms	≤2
11	Dimension of the upper end of the conductive rod from the upper end of the insulating cylinder in the electrically closed position A	mm	84±1.5
12	Minimum air insulation distance	mm	300
13	Conducting main circuit DC resistance per phase	μΩ	≤80

Just opening, just closing the speed refers to just after the split and just before the average speed of 0.01s, the measurement of just split, just close the point of 17mm away from the position of the closing gate. Measurement of just split, just close the speed available oscilloscope, digital display and electromagnetic oscillator, when using 100Hz electromagnetic oscillator (power supply frequency of 50Hz) measurement, speed calculation method is as following:

speed

A：Closing position B：Opening(Closing)point S：Stroke within 0.01s

X:The circuit breaker is 17mm

Diagram Speed calculation method

6. interrupting system：

This circuit breaker arc extinguishing chamber applies the principle of longitudinal blowing and rotating arc extinguishing comprehensively and is supplemented by a small amount of pressure gas principle arc extinguishing. Therefore, it has very good arc extinguishing performance. When breaking, the movable contact moves downward, and the arc arcs between the arc contact fingers of the movable and static contacts, and then the arcs are transferred from the arc contact fingers to the ring electrode, and then the arc current flows through the ring electrode to generate a magnetic field through the coil, and the interaction between the magnetic field and the arc current causes the arc to rotate, and at the same time heats up the gas, and the pressure rises, and forms a gas flow in the nozzle, which cools down the arc, and it is extinguished when the current passes through zero. When breaking small current, due to the arc generated by the lower gas pressure, so in the moving contacts on the addition of a small help blowing device, the pressure generated by it, elevated blowing arc pressure. Therefore, when breaking the size of the current, there is a shorter arc time, and because the arc root rotates on the contacts, so the burn damage is slight, so that the circuit breaker has a long electric life, and make the sulfur hexafluoride gas at zero gauge pressure, the fracture can withstand the highest line voltage between 5min.

7.Installation, commissioning and maintenance

The external dimensions and installation dimensions of the circuit breaker are shown in the attached drawing. The external surface of the circuit breaker should be cleaned up before installation. Various parameters and dimensions of the circuit breaker have been adjusted before leaving the factory, and the circuit breaker only needs to be inflated to the rated gauge pressure of 0.65MPa (20℃) without disassembling when installing. The SF6 circuit breaker should ensure good grounding. Check whether the fasteners are loose, if so, they should be tightened before inflation.

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Products

LTZ-40.5 Indoor High Voltage SF6 Circuit Breaker