Current transformer is a special transformer used to transform current, which is an electrical apparatus to turn the current in high voltage system or high current in low voltage system into standard small current (5A or 1A). When matched with measuring instruments, it can measure the current and electrical energy in the power system; when matched with relays, it can protect the power system. It transmits information to measuring instruments, apparatus or relay protection and control devices; isolates measuring, protection and control devices from high voltage; facilitates miniaturization and standardization of measuring instruments, apparatus and relay protection and control devices.

LB series HV outdoor AC oil-insulated type current transformer is one kind of main products of Everhydro, the develop and product of our current transformer has always been committed to providing high quality, high reliability, high technology content, easy operation and maintenance of transmission and distribution equipment to electric systems.

Part Ⅰ: Operating Characteristics

Type LB series outdoor A. C. oil-insulated Current transformer (CT) is suitable for power system of rated system voltage of 35kV - 220kV. Which mainly used for measuring current, power and energy metering, simultaneously to the relay protection device and automatic control device provide current signal.

Structure: Full sealed structure with capacitance-graded oil impregnated paperand Metal Expander

Location: indoor or outdoor

Ambient temperature: -40℃ - +45℃ (Freezing field can meet -45℃)

Wind load: not exceed 35 m/s

Altitude: not exceed 3000m

Icing thickness: not exceed 10mm

Seismic strength: 8

Pollution level: lII or IV

Note: If the product using conditions beyond the above provisions, please contact us and we can solve as quick as possible.

Part Ⅱ: Demonstration of The Type

For example: type LB6-110W2 expressed that this CT gives extra the protection level winding, the design series number is 6 may use in the Rated system voltage 100kV and can be used for pollution level Ⅲ area.

Part Ⅲ: Product Sectional View and Electrical Diagrams

Part Ⅳ: Products Design Features and Advantages

1. High electric strength, wide insulation margin.

2. Long creepage distance, strong pollution resistance.

3. The structure of main insulation is with more screens, so it has good processing property, lower discharge capacity.

4. Lower dissipation, and steady in the long run.

5. Have temporary protective winding, meet with big capacity of power system, and reclosing operation Secondary class, Large load, High Accuracy.

6. Ensure to provide enough Dynamic-thermal stability current.

7. Hight mechanical strength.

8. Full sealed structure with capacitance-graded oil impregnated paper, and Metal Expander.

9. Good sealability, ensure no leakage.

Part Ⅴ: Main Technical Data

Transformer type		LB-220W2	LBT-220W2 (W3)	LB-132W2	LB-110GYW2	LB-110GYW2 (W3)	LBR-110GYW2 (W3)	LBR-110GYW2 (W3)	LBdf-66W3	LB-35W2
Highest system voltage	kV	252	252	145	126	126	126	126	126	40.5
Rated freguency	Hz	50	50	50	50	50	50	50	50	50
Power freguency withstand voltage	kV	460	460	275	230	230	230	230	160	95
BIL, 1.2/50 U s full ware	kV	1050	1050	650	550	550	550	550	350	185
Chopped test	kV	1208	1208	748	633	633	633	633	403	213
Flashover distance	mm	≥2150	2150	1440	1440	1220	1220	1220	1220	350
Creepage distance	mm	≥6300 (7812)	≥6300 (7812)	≥3150	≥3150	≥3150 (3906)	≥3150 (3906)	≥3150 (3906)	≥1813 (2248)	≥11015
Rated primary current	A	2500	2500	2500	2500	2500	2500	2500	2500	2000
Rated secondary current	A	1；5	1；5	1；5	1；5	1；5	1；5	1；5	1；5	1；5
Accuracy class (Upon request)		0.2S; 0.5; 5P; 10P	0.2S; 0.5; 5P; 10P; TPY	0.2S; 0.5; 5P; 10P	0.2S; 0.5; 5P; 10P	0.2S; 0.5; 5P; 10P	0.2S; 0.5; 5P; 10P	0.2S; 0.5; 5P; 10P	0.2S; 0.5; 5P; 10P	0.2S; 0.5; 5P; 10P
Rated output	VA	10-60	10-60	10-50	10-50	10-50	10-50	10-50	10-50	10-40
Instrument secutity fector	FS	5; 10	5; 10	5; 10	5; 10	5; 10	5; 10	5; 10	5; 10	5; 10
Rated accuracy limit fector		25	25; 30; 40	20	20	20	20	20	20	20
Rated Short-time current/3s (max) lth	kA	50	50	40	40	40	40	40	40	42
Rated dynamic current (max) ldyn	kA	125	125	100	100	100	100	100	100	105
Dimensions	mm	900 X 780 X 3770	915 X 570 X 4123	774 X 600 X 2734	774 X 600 X 2734	714 X 560 X 2420	594 X 485 X 2550	594 X 485 X 2550	714 X 560 X 2420	440 X 440 X 1800
Mounting size	mm	700 X 460	710 X 460	475 X 475	475 X 475	475 X 475	310 X 360	310 X 360	475 X 475	265 X 265
Net weight	Kg	1310	1700	760	760	590	450	450	590	165
Gross weight	Kg	1586	1930	880	880	670	530	530	670	200

Part Ⅵ: Application

Part Ⅶ: Note for Ordering

1. The type and name of the product

2. The rated voltage, rated current ratio, rated output and accuracy class

3. Pollution level

4. Altitude

5. Providing special products for your demand

Part Ⅷ: Service Guarantee

1. Quickly and professional response;

2. Excellent quality with reasonable price;

3. Sufficient support for our tendering representatives;

4. OEM service available based on official & legal authorization;

5. Strict quality control system;

6. Faster lead time than our competitors;

7. 12 months quality guarantee after delivery.

Part Ⅸ: FAQ

Q1: What is your delivery time?

Depend on the type of transformer.

Q2: What is your payment term?

30% advance by T/T , 70% before delivery by T/T or L/C or we can discuss about it.

Q3: What kind of standard you follow?

IEC, ANSI, CSA, GB, etc

Q4: What kind of supporting documentation you can provide normally?

Quotation, outline drawing, manufacturing plan, quality control plan testing plan, financial report, type test report (KEMA, CESI), reference list, etc.

Q5: What is your normal warranty period?

12 months after transformer operation.

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LB Series HV Outdoor AC Oil-Insulated Type Current Transformer