FZW28F-12 type outdoor vacuum load switch boundaries used in the column installation of the occasion, with manual and electric operation functions. Switch body with the introduction of Japan's Toshiba Corp. VSP5-12 maintenance-free load switch, vacuum interrupters, SF6 gas insulated medium done. 
      This product meets the following standards: 
      GB3904-2004 3.6 kV ~ 40.5 kV high voltage AC load switch 
      GB/T11022 common technical requirements for high-voltage switchgear and control equipment standards 
      This manual describes the boundaries of outdoor vacuum load switch structure, function and installation methods. 
      FZW28F-12 type outdoor vacuum load switch with boundary fault detection, protection, control and communication functions, mounted on a 10 kV line, automatic removal of single-phase ground fault isolation and automatic phase short circuit faults. Suitable for 10 kV distribution line into the line of T connected user or the end user, can also be used for other branch lines to meet the requirements of the connection.

The basic mechanism
Toshiba introduced by the boundary switch technology VSP5-12 vacuum load switch, fault detection controller two major components. Through the air outlet and outdoor sealing control cables for electrical connections. 
Vacuum interrupter, SF6 gas insulated, built the main circuit interrupter in series with a knife isolated, high insulation properties. 
Improved electromagnetic mechanism that can be combined points of electric and manual. 
Above the switch setting pressure relief area with "flop" indication. 
Built-in short circuit protection and zero-sequence current transformer; built-in (or external) voltage transformer to provide operating power. 
The whole structure is maintenance-free devices.

Switch Ratings

Project		Unit	Data
Rated voltage		kV	12
Rated insulation level	1minWorking pressure (between poles, / fracture)	kV	Dry	42/49
			Wet	34
	Lightning impulse withstand voltage (between poles on the ground / fracture)	kV	75/85
Rated frequency		Hz	50
Rated Current		A	630
Rated short-time withstand current and duration		kA/4s	April 16
Rated peak withstand current		kA	40
Rated short-circuit current		kA	40
Mechanical life		Secondary	10000
Net weight		kg	210

Note: 1, when the product is higher than the altitude places 1000m, insulation should be amended accordingly.
2, when the built-PT, prohibiting inter-pole pressure.

Controller Specifications

No.	Project	Specified value	Remark
1	Operating input voltage	AC220V
2	Input voltage frequency	50Hz
3	Input voltage fluctuation allowed	220（1±20%）
4	Total power consumption	＜10W
5	Sampling phase current input value	60A~600A(A value)	Settable
6	Low-voltage action value	10V~140V(Secondary value)	Non-tuning
7	Power input value allows sampling error	±5%
8	Overcurrent action delay time value	0.1s~0.3s	Can not be set
9	Zero sequence current value	0.2A~6A(A value)	Can be set
10	Ground motion delay time	0s~1200s	Can be set

Current Transformer
Built-core type wearing a zero sequence CT, ratio of 20/1, 0.2A ~ 6A section should remain linear variable nominal load ratio error should be less than 3%, the primary zero sequence current of 400A, the two times the rms output current is not less than 6A. To improve the mechanical strength, the CT number of the body fat with ethylene integrally cast. 
Built-2 (A, C phase) single-phase CT phase current protection for use ratio of 600/1.

Voltage transformer
Variable ratio 10000V/220V, capacity 50VA, under partial discharge in 10pC, operating power and low-voltage components are PT secondary control devices provided.

Load Switch model naming and meaning

Controller Model name and meaning

● maximum ambient air temperature does not exceed 40 ℃, the lower limit of not more than -45 ℃; 
● Wind speed not greater than 35m / s; 
● altitude higher than 1000m, the earthquake intensity does not exceed 8 degrees; 
● Humidity: Monthly average relative humidity less than 90%; daily average relative humidity less than 95%; 
● ice thickness not exceeding 10 mm; 
● installation site should be non-flammable, explosive, chemical corrosion and severe vibration regular place; 
● Neutral Safety grounding: ungrounded neutral point arc suppression coil grounding, neutral grounding via low resistance.