66KV Double-winding Oil Immersed Transformer

Type Meaning

华通型号说明.png

Main technical parameters

with off-circuit Tap Changer

Rated capacity (kVA)	Voltage ratio (kV)			Connection Symbol	No-load loss(kW)	No-load current(%)	Full-load loss(kW)	Impedance(%)
Rated capacity (kVA)	HV	HV Tapping Range	LV	Connection Symbol	No-load loss(kW)	No-load current(%)	Full-load loss(kW)	Impedance(%)
6300	110 121	±2×2.5%	6.3 6.6 10.5 11	YNd11	9.2	0.6	36.0	9
8000					11.2	0.6	42.7
10000					13.2	0.55	50.4
12500					15.6	0.55	59.8
16000					18.8	0.5	73.5
20000					22.0	0.5	89.1
25000					26.0	0.45	105.3
31500					30.8	0.45	126.9
40000					36.8	0.4	148.9
50000					44.0	0.4	184.5
63000					52.0	0.35	222.3

with On-load Tap-Changer

Rated capacity (kVA)	Voltage ratio (kV)			Connection Symbol	No-load loss(kW)	No-load current(%)	Full-load loss (kW)	Impedance(%)
Rated capacity (kVA)	HV	HV Tapping Range	LV	Connection Symbol	No-load loss(kW)	No-load current(%)	Full-load loss (kW)	Impedance(%)
6300	63 66 69	±2×2.5%	6.3 6.6 10.5 11	YNd11	10	0.6	36.0	9
8000					12	0.6	42.7
10000					14.2	0.55	50.4
12500					16.8	0.55	69.8
16000					20.2	0.5	73.5
20000					24	0.5	89.1
25000					28.4	0.45	105.3
31500					33.7	0.45	126.9
40000					40.3	0.4	148.9
50000					47.6	0.4	184.5
63000					56.2	0.35	222.3

ZM on-load tap-changer

1、rated voltage:35-220kV

2、rated frequency:50/60Hz

3、The maximum rated three-phase current capacity is from 300A to 2000A.

Technical Parameters

Item	Specification			Ⅲ300	Ⅲ500		Ⅲ600	I301		I501	I601		I800	I1200		I1500
1	Max.rated through current(A)			300	500		600	300		500	600		800	1200		1500
2	Rated frequency(Hz)			50 or 60
3	Phase & connect model			Three phase for Neutral point of Y connection				Single phase for selectable winding connection
4	Max. rated step voltage(V)			3300
5	Rated step current(kVA)			1000	1400		1500	1000		1400	1500		2640	3100		3500
6	Short circuit current (kA)		Termal(3s)	6	8		8	6		8	8		16	24		24
			Dynamic(peak)	15	20		20	15		20	20		40	60		60
7	Number of operating position			Linear regulation: 7、10、12、14、16、18、22、34 Reversing and coase and fine regulation: ±3～±17
8	Insulation level of tap changer (kV)	Rated Voltage		35		66			110			150			220
		Max.working voltage		40.5		72.5			126			170			252
		Power frequency withstand voltage(50Hz,1min)		85		140			230			325			460
		Rated lightning impulse withstand voltage(1.2/50μs)		200		350			550			750			1050
9	Tap selector			4 grades of A, B, C and D according to the insulation level
10	Mechanical service life			Not less than 800,000
11	Electrical service life			Not less than 200,000
12	Oil compartment for diverter switch	Service pressure		3×104Pa
		Leakage test		No leakage under 6×104Pa 24 hours
		Over pressure protection		Blasting cap blast at (4～5)×105Pa
		Protective relay		QJ4-25 oil flow speed set at 1.0m/s±10%
13	Oil drainage volume (L)			About 190～270
14	Oil filling volume (L)			About 125～190
15	Weight (kg)			About 240～350
16	Motor-driven unit			MAE/MA7B

basic wiring

华通尺寸图.png

Voltage gradiant of every part of regulating coil

External dimension diagram of ZM

Note:

1.Step capacity = step voltage x load cuttent; Rated step capacity is the continuous permissible max.step capacity.

2.For single-phase tap changer formed by parallel of three-phase tap changer contacts; it is necaessary to take coil shounting of transformer into consideration. For ZMI800, there are two shunts. For ZMI1200 and I1500, there are three shunts.

3.The tap-changer of single phase liner regulating with 34 operating positions only have: I500A, I 800A, I1500A.

66KV Double-winding Oil Immersed Transformer

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