Lw25-126/145/T Outdoor High-Voltage AC Porcelain-Insulated Sf6 Gas Circuit Breaker

• Customization: Available
• Breaking Capacity: High Voltage Circuit Breakers
• Operation: Manual Type
• Model NO.: LW25-126/145/T
• Speed: High-Speed Circuit Breaker
• Arc-extinguishing Medium: SF6
• Installation: Fixed
• Structure: ACB
• Poles Number: 3
• Type: Circuit Breaker
• Function: Conventional Circuit Breaker, Circuit-Breaker Failure Protection, Overcurrent Protection, OVP(Overvoltage Protection), RCCB
• Certification: ISO9001-2000, CCC
• Application: for Control and Protection of 110kv Power System.
• Rated Voltage: 40.5kv/72.5kv
• Rated Current: 3150A
• Mechanical Life: 6000times
• Transport Package: Wooden Case or Others
• Specification: Designed According to Supplier Specifications
• Trademark: HZEC
• Origin: China
• Production Capacity: 3000sets/Year

Product Description

Product Description

Outdoor H.V. A.C. Live Tank SF6 Gas Circuit Breaker

Live tank SF6 gas circuit breakers,whose rated voltage from 40.5kV to 550kV and

rated current from 3150A to 5000A are provided with two kinds of operating mechanism, spring and

hydraulic type. Motor is used in spring mechanism to charge closing spring and to charge opening

spring during closing operation. Disk spring is used in hydraulic mechanism for charging in stead

of traditional compressed nitrogen gas, and hydraulic driving is used in both opening and closing

operations. The two kinds of operating mechanism have their own features and are used respectively

for different voltage class. Due to the unit structure of circuit breaker, it boasts of advantages of

minimized number of breaks and components, simple structure, high reliability as well as long

maintenance-free period.

LW25-252/T4000-50 circuit breaker with spring operated mechanism was successfully developed and

tested in Sep. 2006, filling in the blank in China.
LW25D- /T3150- single-phase operated circuit breaker with spring mechanism was successfully

developed and tested in Dec. 2006.

LW25A-252/Y4000-50 three-phase mechanically group-operated circuit breaker with hydraulic

mechanism was successfully developed and tested in Jan. 2007. It was the first set made in China.

LW25-126/T4000-40 special circuit breaker for reactive compensation passed the required technical

appraisals in Jan. 2007, with switching capacity of 1600A (back-to-back capacitor bank current and

shunt reactor current), breaking capacity of 3500-4000A (single capacitor bank current), which can meet

the switching requirements of main circuit and by-pass circuit for reactive compensation in UHV.

220kV circuit breakers (and above voltage) with "XD" brand were awarded "China Famous Brand"

in Sept. 2007.

LW15A-550/Y5000-63 special circuit breaker was successfully developed and tested in Aug., 2008 with

breaking capacity of capacitive current 500A (C2), recovery voltage 1470kV, which is able to break the

capacitive current in 500kV line. It filled the domestic blank with international advanced level.

LW15C-252/Y5000-63 circuit breaker with high breaking capacity equipped with hydraulic mechanism

was successfully developed and tested in Oct. 2008, which was the national initiative with international

advanced level.

±50kV high voltage DC circuit breaker with international advanced level was successfully developed

and tested in 2009, including NBS(Neutral Busbar Switch), MRTB(Metal Ring Transfer Breaker),

GRTS(Grounding Ring Transfer Switch) and NBGS(Neutral Busbar Grounding Switch).

ZW-126/T2000-40 vacuum circuit breaker was successfully developed in 2010, and it reached the

international advanced level.

Detailed Photos

 

2. Normal Service Conditions

2.1 Altitude:≤1000m(3000m for extremely cold area);

2.2 Average relative humidity monthly:≤90%;

2.3 Max. wind velocity:≤35m/s;

2.4 Pollution class:IIIclass,IVclass;

2.5 Ambient temperature :-35ºC~40ºC;

(It's satisfied under the condition of -40ºC in heavy cold area);

2.6 Max.temperature difference daily:25K;

2.7 Earthquake intensity:9 degree;

2.8 Max. icing thickness: 20mm;

2.9 Max. radiance from sun:1000W/m2;

Note: When the product is used out of above condition, the user and the manufacturer shall reach

an agreement through coordination.

Product Parameters

Main Technical Data

Technical Data of 40.5~252kV Circuit Breakers

No.	Item			Uint	LW9-40.5/T	LW9-72.5/T LW9A-72.5/T	LW25-126/145/T LW25D-126/145/T LW25o-126/145/T	LW25-170I/P LW25-170III/P	LW25-252/T LW25A-252/Y	LW15C-252/Y
1	Rated voltage			kV	40.5	72.5	126/145	170	252	252
2	Rated frequently			Hz	50	50	50	50	50	50
3	Rated current			A	3150/4000	3150/4000	3150	3150	4000	40,005,000
4	Rated short-circuit breaking current			kA	50	31.5/40	31.5/40	40	4,050	63
5	Rated short-circuitmakingcurrent			kA	125	80/100	80/100	100	100,125	160
6	Rated short-time withstand curentand duration			kA	50(3s)	31.5(4s)/40(4s)	31.5(4s)/40(4s)	40(3s)	40(4s),50(4s)	63(3s)
7	Rated peak withstand current			kA	125	80/100	80/100	100	80/100	160
8	Creepage distance			cm/kV	3.1	3.1	2.5/3.1	2.5,3.1	2.5,3.1	2.5,3.1
9	min.power frequency withstand voltage	Dry test	Across open breaks	kA	95+23.4	160+42	230+95	325	460+145	520+165/520
			To earth		95	160	275	325	460	460
		Wet test	Across open breaks		95	160+42	230+95	325	460+145	460+145
			To earth		95	160	275	325	460	460
10	Rated lighting impulse withstandvoltage		Across open breaks		185+33	350+59	650+100	750	1050+200	1188+226/1188
			To earth		185	350	650	750	1050	1188
11	Closing time			ms	100	100	100	80-110	100	55-80
12	Opening time			ms	≤30	≤30	≤30	21-30	≤30	≤25
13	Breaking time			ms	≤60	≤60	≤60	≤60	≤60	≤60
14	CO time			ms	≤60	≤60	≤60	≤60	≤70	≤60
15	(20ºC)Rated SF6 gas pressure(at 20ºC)			MPa	0.50	0.50;0.40	0.50	0.60	0.60;0.40	0.60
16	Rated SF6 gas of alarming/lockoutpressure (at 20ºC)			MPa	0.45/0.40	0.45/0.40;0.35/0.30	0.45/0.40	0.55/0.50	0.55/0.50;0.35/0.33	0.55/0.50
17	Operating mechanism				Spring mechanism	Spring mechanism	Spring mechanism	Spring mechanism	Spring mechanism/ Hydraulic mechanism	Hydraulic mechanism
18	Applied standards				GB/T 1984,IEC 62271-100
Note:"T"following the type of product means that the product is equipped with a Spring mechanism;      "Y"with a hydraulic operating mechanism.
LW25D-126/145/T is a kind of 126/145kV single-phase operated circuit breaker. LW25o-126/T is a special circuit breaker for reactivecompensation circuit. LW25A-252/Y is a kind of 252kV three-phase mechanically gang-operated circuit breaker

Technical Data of 363~550kV Circuit Breakers

No.	Item		Uint       LW25-363/Y		LW25-420/Y	LW15A-363/Y	LW15A-550/Y
1	Rated voltage		kV	363	420	363	550
2	Rated frequently		Hz	50	50	50	50
3	Rated current		A	4000	4000	5000	31,504,000
4	Rated short-circuit breaking current		kA	50	50	63	5,063
5	Rated short-circuit making current		kA	125	125	160	125,160
6	Rated short-time withstand current and duration		kA	50(4s)	50(4s)	63	50(3s),63(3s)
7	Rated peak withstand current		kA	125	125	160	125,160
8	Creepage distance		cm/kV	3.1	2.0,2.5,3.1	2.0,2.5,3.1	2.0,2.5,3.1
9	1min.power frequency withstand voltage	Across open breaks	kV	580	630+245	510+210	680+318
		To earth		510	630	510	740
10	Rated lighting impulse withstand voltage	Across open breaks	kV	1175+205	1425+345	1175+205	1675+450
		To earth		1175	1425	1175	1675
11	Closingtime		ms	65-95
12	Opening time		ms	18~30		≤20
13	Breaking time		ms	≤50		≤40
14	CO time		ms	35~60
15	(20ºC)RatedSF6 gas pressure(at 20ºC)		MPa	0.60
16	Rated SF6 gas of alarming/lockout pressure(at 20ºC		MPa	0.55/0.50
17	Operating mechanism			Hydraulic mechanism
18	Applied standards			GB/T 1984,IEC 62271-100,DL/T402
Note:"T"f ollowing the type of product means that the product isequipped with a Spring mechanism,      "Y"with a hydraulic operating mechanism.
LW25D-126/145/T is a kind of 126/145kV single-phase operated circuit breaker. LW25a-126/T is a special circuit breaker for reactive compensationcircuit. LW25A-252/Y is a kind of 252kV three-phase mechanically gang-operated circuit breaker

Spring Operating Mechanism for CB

No.	Item	Unit	Technical Data
1	Volage of control circuit	V	DC 220/DC 110
2	Current of trip coil	A	2~2.5/5.8
3	Current of close coil	A	2/3.3
4	Voltage of energy-store motor	V	DC220/DC110(AC220)
5	Power of energy-store motor	W	450
6	Voltage of heater	V	AC220
7	Power of heater	W	100

Hydraulic Operating Mechanism for CB

No.	Item	Unit	Technical Data
1	Volage of control circuit	V	DC220/DC 110
2	Current of trip coil	A	1.43/3.06
3	Current of close coil	A	1.43/3.06
4	Voltage of energy-store motor	V	DC 220/DC 110/AC 220
5	Power of energy-store motor	W	470/1300
6	Voltage of heater	V	AC220
7	Power of heater	W	100
8	Rated mechanical operating pressure	MPa	44.9/53.1
CYA3,CYA4

Main Features and Advantages

Main Features and Advantages

1.Superior interrupting capability

Single-unit structure is applied in the construction of circuit breaker with variable break distances,

which is able to meet different switching requirements. The well designed arc-extinguishing chamber

can withstand either severe rising rate of the recovery voltage by a short-line fault or peak recovery

voltage by breaking out-of - phase current. In switching excited current, the overvoltage is less than

twice of operating voltage. No restrike or reignition occurs during switching line-charging current.

2. Reliable insulation and current-carrying capability

Because of the isolation of SF6 gas from the atmosphere, the breaker has a reliable insulating capa

bility.SF6 gas property does not change with age and at the same time it protects the insulating parts

within the gas chamber. It also prevents the contacts from oxidization and other chemical reactions

as SF6 gas is stable and inert in nature when it is used together with other materials.

3. High reliability

The series of circuit breakers passed all type tests at National High Voltage Apparatus Quality Mon

itor and Inspection Center. The mechanical endurance is 3000 times without adjustment and 10000

times with lubrication and adjustment allowed. They also passed the electrical endurance test, break

ing 20 times at rated short-circuit breaking current (40kA/50kA/63kA) during type tests.

4. Excellent operating mechanism

The spring operated mechanism is professionally manufactured by Sino-Japanese joint venture XD

Mitsubishi Co. with excellent performance. The hydraulic operating mechanism is also very reliable

and durable.

5. Minimized maintenance work

The circuit breaker is constructed by unit structures, resulting in minimized number of breaks and

parts, thus greatly reduces the inspection and maintenance work. In addition, its operating mecha

nism boasts advanced technology and excellent performance, the circuit breaker hardly needs any

repair.

6. Excellent earthquake withstand capability

The live tank SF6 gas circuit breaker is substantially resistant to seismic shock due to its simple con

struction and light weight.

Structure and Principle

For this SF6 circuit breaker, the single-unit structure is applied in the construction. There are advantages

of minimized number of breaks and parts, and simply structure.

Both opening and closing operations of spring mechanism are driven by spring force. Before oper

ation, closing spring is charged by motor in advance while opening spring is charged during closing

operation. The controlling parts of second circuit and SF6 gas density are placed in the enclosure of the

mechanism.

In hydraulic operating mechanism, the disk spring is charged by oil pump driven by motor. The power

of hydraulic pressure is used to complete opening/closing operation. This mechanism is provided with

anti-slow opening device
Spring operated mechanism

The design of this mechanism ensures the excellent performance required by reliable operation.Fig.2

shows the mechanism at closed position. When tripping coil is energized, holding latch for opening is

released, and the lever engaged with the locking device rotates counterclockwise driven by tripping

spring. Fig.3 shows the mechanism at opening position. At this moment, when closing coil is energized,

holding latch for closing is released, the cam and the ratchet wheel engaged with the locking device

rotate counterclockwise driven by closing spring, and the lever rotates clockwise. The torque created by

cam compresses the opening spring.Fig.4 shows the mechanism at closed position (Closing spring dis

charged). Once the closed operation is completed, the closing spring is charged by the ratchet linked to

the motor

 

Packaging & Shipping

After Sales Service

1.Our company provides you with project design and process design, and designs and manufactures products according to your equipment purchase plan and specific needs. And train technical and operating personnel for you.

2.The newly purchased products are provided with online assistance for installation and debugging. The products are under the lifelong service system. If problems occur in normal use, we will provide solutions within one working day after receiving user's feedback. We will try our best to get the product up and running as soon as possible. And there are regular visits by professional technicians to ensure the long-term, safe and reliable use of our products.

3.We use quality authentic materials, process and manufacture in strict compliance with ISO9001:2000 international quality management to ensure the quality of excellence and the smooth installation!
 

FAQ