ZGS□ Combined transformer

ZGS□ Combined transformer (Commonly known as American box transformer), its structure is “品” type, transformer and high and low voltage equipment are closely connected as one, among them, three sides of the transformer exposed to the air, good heat dissipation conditions, and can be separated from high and low voltage equipment enclosure, easy maintenance.

The transformer adopts chip type oil tank, no oil pillow, fully enclosed S□series oil immersed transformer, high and low voltage bushing, tap switch, oil level indicator, pressure release valve, oil release valve and so on are installed on the high voltage chamber body end plate, reasonable position, easy to obsere and operate. High voltage room, low voltage room between the steel plate separated, high voltage room, low voltage room transformer is relatively independent, and maintain a complete box to change the whole, compact structure, small volume, light weight. The power distribution switchgear is installed on the high and low voltage side.

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Overview

Model And Meaning

ZGS□ Combined transformer (1)

Features

Small size, compact structure, easy installation;

Can be used for ring network, also can be used for terminal, reliable protection of personal safety;

Low damage, low noise and superior performance;

Low temperature rise, strong load capacity.

High voltage interval

The high voltage interval contains high pressure line Incoming sleeve, load switch operating handle, non-excited pressure regulating tap switch, plug-in fuse, pressure release valve, oil temperature gauge, oil level gauge, pressure gauge, oil filling hole, oil discharge valve, etc.

Low voltage interval

In the low voltage distribution cabinet, an intelligent undervoltage controller is installed, which has the function of identifying the abnormal voltage of the substation low voltage bus. When the high-voltage one or two-phase fuse is blown and the substation low-voltage measurement voltage is abnormal, the controller sends out an action signal to make the circuit breaker trip. When the three-phase voltage of the low voltage side is lower than 50% of the normal voltage, the controller does not send an action signal, so as to avoid the trip of 10kV high voltage line or power failure maintenance caused by all the low voltage switch trip. Can be installed according to user requirements with telemetry, remote communication function of comprehensive power distribution tester.

Installation conditions

Cooling condition: Air self-cooling;

Altitude: ≤1000m;

Environment temperature: The outdoor environment temperature is not higher than 40℃ and not lower than-45℃: the monthly average temperature is not higher than 30℃ and the annual average temperature is not higher than 20℃;

Relative humidity: At 25℃, the relative humidity of the air does not exceed 95%, and the average monthly temperature does not exceed 90%;

Shockproof level: Horizontal acceleration is not greater than 0.3m/s², verical acceleration is not large 0.15m/ s²;

Surrounding environment: Installation environment should be free from obvious pollution, explosive, corrosive gas and dust;

Installation site: There should be no violent vibration and impact, and it is required to be installed on a cement platform or other smooth and solid platform;

When the above conditions cannot meet the use requirements, the user shall negotiate with the manufacturer.

Box variable performance parameters

Technial Parameters

Rated capacity kV.A	Voltage combination kV		Connection group	Loss kW		No-load current %	Short circuit impedance %	Weight kg			Overall dimensions mm L(Length)×W(Width)×H(Height)	Gauge Vertical / Horizontal
Rated capacity kV.A	High voltage	Low voltage	Connection group	No- load	Load 75℃	No-load current %	Short circuit impedance %	Body weight	Oil weight	Total weight	Overall dimensions mm L(Length)×W(Width)×H(Height)	Gauge Vertical / Horizontal
30	10.5 10 6.3 6	0.4	Dyn11 Yzn11 Yyn0	0.08	0.63/0.6	1.5	4.0	185	70	310	790×660×925	550/400
50				0.1	0.91/0.87	1.3		255	85	395	820×675×1030	550/400
63				0.11	1.09/1.04	1.2		280	95	430	845×690×1065	550/400
80				0.13	1.31/1.25	1.2		320	100	480	865×715×1075	550/550
100				0.15	1.58/1.5	1.1		380	110	540	880×720×1120	550/550
125				0.17	1.89/1.8	1.1		444	115	600	910×750×1110	550/550
160				0.2	2.31/2.2	1.0		510	130	690	910×750×1200	550/550
200				0.24	2.73/2.6	1.0		610	150	840	1220×745×1220	550/550
250				0.29	3.2/3.05	0.90		720	190	950	1240×775×1300	660/660
315				0.34	3.83/3.65	0.90		835	200	1065	1230×750×1345	660/660
400				0.41	4.52/4.3	0.80		1010	240	1255	1330×825×1375	660/660
500				0.48	5.41/5.15	0.80		1170	260	1485	1455×915×1390	660/660
630			Dyn11 Yyn0	0.57	6.2	0.60	4.5	1375	320	1800	1540×920×1510	660/660
800				0.7	7.5	0.60		1620	365	2120	1650×1035×1555	820/820
1000				0.83	10.3	0.60		1780	405	2450	1855×1235×1600	820/820
1250				0.97	12.0	0.50		2065	560	2855	1925×1285×1680	820/820
1600				1.17	14.5	0.50		2470	650	3400	2025×1355×1730	820/820
2000				1.55	18.3	0.40	5.0	2700	695	4460	2190×1900×1950	820/820
2500				1.83	21.2	0.40	5.0	3230	870	5330	2240×1940×1980	1070/1070

Note: ① The load loss values above the middle slash apply to the Dyn11 or Yzn11 connection group, and the load loss values below the slash apply to the Yyn0 connection group.

② The overall dimension is only for reference in the selection. The final size is subject to the product outline drawing.

List of Fuse Configuration for High Voltage Protection of American Transformer

Rated capacity of transformer (kVA)	Low voltage side (0.4kV) Rated current (A)	High voltage side(10kV) Rated current (A)	Plug-in fuse capacity (A)	Backup fuse capacity (A)	Low voltage configuration main switch capacity (A)
50	72.2	2.89	4 or 6	10	100
80	115.5	4.62	10	20	160
100	144.3	5.77	10	20	200
125	180.4	7.22	10	25	250
160	230.9	9.24	15	40	315
200	288.7	11.55	20	40	400
250	360.8	14.43	25	50	500
315	454.7	48.19	31.5	80	630
400	577.4	23.09	40	80	800
500	721.7	28.87	50	100	1000
630	909.3	36.37	65	125	1250
800	1154.7	46.19	80	125	1600
1000	1443.4	57.74	100	200	2000
1250	1804.2	72.17	125	250	2500
1600	2309.4	92.38	160	320	3200

Load switch performance parameters

Rated current (A)	Rated voltage (kV)	Impulse withstand Voltage (kV)	Power frequency withstand voltage (Imin.kV)	Rated short- time withstand current(kA/s)	Number of load operations	Number of machine operations
315	12	75	42	20/s	100	2000
630	12	75	42	20/s	100	2000