Outdoor Vacuum Circuit Breaker

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Description
The outdoor vacuum circuit breaker is a reliable three-pole electrical switch of our company. It is equipped with a newly designed spring operating mechanism which could avoid such shortcomings of the old-fashioned one as the clamper stagnation and low-resistance to erosion. Given this, this outdoor vacuum circuit breaker enjoys a more reliable performance and a longer mechanical endurance which could be up to 10,000 times. Moreover, as an electrical safety switch, it is highly credited for its stable and reliable breaking performances, free maintenance and a much lighter weight (66.7% of similar products' weight).

Working Occasions

Circuit breakers, including the cut-off switch and tie switch, have been wildly applied in the power grids of both urban and rural areas, protecting the opening or closing load current, overload current and short circuit current. It could also be used together with the FTU. As an automatic inspection, isolation and alarming device used in the loop power distribution system, this outdoor circuit breaker could monitor the operation of the network and automatically restore the power supply of non-faulty sections. When the switch configuration, circuit protection, control and contact functions get modularized, this outdoor circuit protection device could perfectly meet the requirements of automatic power distributions.

Quality Assurance
The production of this 24kV outdoor circuit breaker requires an extremely strict Epoxy resin cast. To ensure good quality of our products, Minde has introduced the vacuum casting process and other process assurance measures. Moreover, we have been imposing strict X-ray inspection and other tests on every finished product in hope of ensuring a reliable and consistent quality of them. Additionally, this outdoor vacuum circuit breaker is equipped with a metal insert which is elaborately designed based on our thorough understanding on the properties of the Epoxy Resin and could help the device operate smoothly for long at the temperature from -25°C to 40°C.

MGK31T Reclosing Controller

1. The MGK31T reclosing controller is a monitoring unit applied in the medium-voltage overhead line of the electric power distribution network. It enjoys such brilliant and reliable functions as remote-control and automatic reclosing management as it is matched with the pole-mounted switch. This monitoring unit is located next to the switch and could be applied to a system of 35kV and below.

2. MGK31T reclosing controller is a comprehensive outdoors automatic metering and controlling device which integrates the functions of line protection, control, metering and signal monitoring. It could provide all the below functions needed for the long-distance operations of a single overhead line:

communication function with control centers;
local control of switches;
remote-control function (with hand-held remote controller);
wireless data transmission;
line fault detection;
UPS of each component;
line protection;
and auto-reclosing.

Technical Parameters of the Outdoor Vacuum Circuit Breaker

Table 1 Circuit Breaker's Main Technical Data
				Data
NO.	Item		Unit	12kv	24kv
1	Rated voltage		kV	12	24
2	Rated frequency		Hz	50	50
3	Rated current		A	630/1250	630/1250
4	Rated short circuit breaking current		kA	20/25	20/25
5	Rated peak withstand current		kA	50/63	50/63
6	Rated short time withstand current/ lasting time		kA/s	20/4 ,25/4	20/4 ,25/4
7	Rated short circuit closing current(peak)		kA	50/63	50/63
8	Rated operating sequence			O-0.3s-CO-180s-CO
9	Mechanical life		times	10000	10000
10	Rated short circuit breaking current breaking times		times	50	20
11	1min power frequency withstand current	(wet )	kV	34/36	50/64
11	1min power frequency withstand current	(dry )	kV	42/49	65/79
12	Lightning impulse withstand voltage(peak)		kV	75/85	125/145
13	Secondary circuit power frequency withstand voltage (1min)		V	2000	2000

Table2 Circuit Breaker's Main Mechanical Data
NO	Item		Unit	Data
NO	Item		Unit	12kv	24kv
1	Clearance between contacts		mm	9±1	12±1
2	Contact's over travel		mm	2.5±0.5	3.5±1
3	Open speed		m/s	1.4±0.2	1.4±0.2
4	Closing speed		m/s	0.7±0.2	0.7±0.2
5	Contact closing jumping time		ms	≤2	≤2
6	Pole center distance		mm	340±1.5	380±1.5
7	Three pole open/close non-simultaneity		ms	≤2	≤2
8	Each pole conducting circuit resistance		μΩ	≤70	≤70
9	Closing time		ms	25-60	25-60
10	Open time		ms	20-60	20-60
11	Motor's rated power		w	40	40

Boundary Dimensions Figure of the Outdoor Vacuum Circuit Breaker

boundary dimension figure of the 12kV outdoor
vacuum circuit breaker
boundary dimension figure of the 24kV outdoor
vacuum circuit breaker

Installing Instruction

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