Pad Mounted Transformer

Operating environment

1、Place of use: outdoor

2、Altitude: ≤ 2000m

3、Outdoor ambient temperature: - 45 ℃~+45 ℃

4、Wind speed: ≤ 35m/s

5、Average relative humidity (25 ℃): daily average ≤ 95% monthly average ≤ 90%

6、Seismic intensity: 8

Model description

华通型号说明.png

Structural layout plan

华通图片.png

Main technical parameters

Serial No	entry name	Company	numerical value
Serial No	entry name	Company	High voltage side	transformer	Low voltage side
1	Rated voltage	KV	24	20/0.4	0.4
2	Rated current	A	6-100		100-4000
3	Transformer capacity	KVA		50-2500
4	Rated short-circuit breaking current	KA	31.5; fifty		30-50
5	Rated short-circuit making current	KA	50
6	Rated short-time withstand current	KA/S	20/2		30/1
7	Rated peak withstand current	KA	50		63
8	Power frequency withstand voltage 1min	KV	50 between phases and ground; Fracture 65
9	Lightning impulse withstand voltage	KV	Phase to phase and ground 95; Fracture 110
10	Cabinet protection grade		IP3X	IP2X	IP3X
11	Noise level		Dry transformer is less than 65dB; Oil transformer is less than 55dB
12	Number of circuits		1-10	1-2	4-20

Main electrical equipment

1. Technical parameters of Safe series switches

	C module	F module	V module		CB module
	Load switch	Combined electrical apparatus	vacuum switch	Isolating/ Earthing switch	Vacuum circuit breaker	Isolating/ Earthing switch
Rated voltage KV	24	24	24	24	24	24
Power frequency withstand voltage KV	50	50	50	50	50	50
Lightning impulse withstand voltage KV	125	125	125	125	125	125
Rated current A	630	Note 1	630		630
Breaking capacity
Closed loop breaking current A	630
Cable charging breaking current A	135
Ground fault breaking current A	150
Breaking current A of cable charging in case of ground fault	87
Short circuit breaking current KA		Note 2	16		20
Closing capacity KA	52.5	Note 2	40	40	50	50
Short time withstand current for 3s KA	21		16	16	20	20
Mechanical life times	5000	3000	5000	2000	5000	5000

Note 1: Depends on the rated current of the fuse

Note 2: Restricted by high-voltage fuse

2. Transformer

S11 three-phase oil immersed distribution transformer (50kVA-1000kVA)

Rated capacity kVA	Voltage combination and tapping range			Connection group grade	No load loss kW	Load loss kW	No load current %	Short circuit impedance %
Rated capacity kVA	high pressure kV	High voltage divider Scope of connection %	low pressure kV	Connection group grade	No load loss kW	Load loss kW	No load current %	Short circuit impedance %
50	20	±5	0.4	Dyn11	0.13	0.87	2.0	4.0
80					0.18	1.25	1.8
100					0.2	1.5	1.6
125					0.24	1.8	1.5
160					0.29	2.2	1.4
200					0.33	2.6	1.3
250					0.40	3.05	1.2
315					0.48	3.65	1.1
400					0.57	4.3	1.0	4.5
500					0.68	5.15	1.0
630					0.81	6.2	0.9
800					0.98	7.5	0.8
1000					1.15	10.3	0.7
Note: 1. According to the requirements, the high-voltage tapping range of the transformer can supply ± 2 × 2.5%. 2. The product performance parameters of other capacities shall be determined by the user and the manufacturer through consultation.

3. Fuse

Fuse transformer comparison table

4、Foundation size

Transformer capacity (KVA)	High voltage distribution mode	Low voltage cabinet arrangement	long	wide	high
50-250	terminal	No corridor	3000	2000	2900
	terminal	There are corridors	3600	2300	2900
	Ring network	No corridor	3000	2600	2900
	Ring network	There are corridors	3600	2600	2900
315-630	terminal	No corridor	3400	2400	2900
	terminal	There are corridors	4200	2400	2900
	Ring network	No corridor	3400	2600	2900
	Ring network	There are corridors	4200	2600	2900
800-1000	terminal	No corridor	4000	2400	2900
	terminal	There are corridors	4400	2400	2900
	Ring network	No corridor	4000	2600	2900
	Ring network	There are corridors	4400	2600	2900

5、Scheme example

6、Terminal type