72.5 KV Catalog

8/2/2019 72.5 KV Catalog

1/15

LW30-72.5 Outdoor HV SF6 Circuit Breaker

1

1 .General 1.1.1 LW30-72.5 Outdoor HV SF6 Circuit Breaker

is of 3-phase, AC, 60Hz high-voltage switchgear,

used for the control and protection of 72.5kV

power distribution and transmission system, aswell as being used as the network interconnected

circuit breaker and in the places switching

capacitor bank.

1.1 LW30-72.5 60Hz 72.5kV

1.2 The LW30-72.5breaker is incorporated withCT26 spring operating mechanism.

Self-energized arc control principle is adopted.

The breaker has won a national patent which No.

is ZL01 2 62031.9.

1.2 LW30-72.5+ CT26ZL01 2 62031.9

1.3 The breaker conforms to IEC62271-100:2001and GB1984-2003 about high-voltage alternating

current circuit breakers.

1.3 GB1984-2003 IEC62271-100:2001100

1.4 Main characteristics

The breaker provides the following advantages:

Self-energized arc control principle, excellent

breaking capacity; short arcing time, long

electrical life, low operation noise; Adopting SF6

as the insulating medium, no danger of fire and

explosion, could be used for the population dense

area; Spring operating mechanism is incorporated

to provide simple and compact structure, safe and

reliable operation.

1.4 : SF6

1.5 Working conditions

1.5.1 Ambient temperature: -30+40(-40+40 for special order)

1.5.2 Altitude: 2500m1.5.3 Air humidity

Relative humidity at average per day: 95%Relative humidity at average per month: 90%1.5.4 Max. wind velocity: 35m/s

1.5.5 Thickness of the ice covered: 10mm

1.5.6 Seismic intensity:Horizontal acceleration: 0.3gVertical acceleration: 0.15g

1.5 1.5.1 -30+40

-40+401.5.2 2500m1.5.3 95%

90%251.5.4 700Pa1.5.5 10mm1.5.6 0.3g

0.15g

8/2/2019 72.5 KV Catalog

2/15


2

1.5.7 Sunshine intensity: 0.1w/cm2

(at wind velocity of 0.5m/s)

1.5.8 Max. daily temperature rise: 251.5.9 Symmetrical Creepage distance: 31mm/kV

1.5.10 Keep the breaker away from places withcombustible, explosive, corrosive materials

and violent vibrations.

1.5.7 0.1W/cm2( 0.5m/s)

1.5.8 251.5.9 31mm/kV1.5.10

2. Main technical parameters 2.2.1 Main technical data of the breaker are shown

in table 1.

2.1 1

Table 1 1No. Name Unit LW30-72.51

Rated voltage kV 72.52

Rated current A 31503

Rated short-circuit breaking current(Ie) kA 40 31.54

Rated short-circuit making current (peak) kA 100 805 Rated short-time withstand current(4s) kA 40 31.56

Rated peak withstand current kA 100 807

Short-line fault breaking current kA Ie90 Ie758

Out-of-phase breaking current kA Ie259

Rated pressure of SF6 gas

SF620 MPa 0.5 0.3810

Alarm pressure of SF6 gas20 MPa 0.45 0.3411

lock pressure of SF6 gas20 MPa 0.4 0.312

Rated line-charging breaking current A 50

13

Rated lightning impulse withstand voltagePhase-to-phase or phase-to-earth kV 350Across open contacts kV 410

8/2/2019 72.5 KV Catalog

3/15


3

14

1 min. power frequency withstand voltage

Phase-to-phase or phase-to-earth

kV 160Across open contacts

kV 20215

Rated operating sequence

O-0.3s-CO-180s-CO16

Radio interference level

uV 50017

Close time

ms 951518

Open time

ms 33719 Total breaking time ms 6020

Opening asynchronism among phases

ms 321

Closing asynchronism among phases

ms 522

First-pole-to-clear factor

1.523

Resistance of main circuit

60

24

Accumulative breaking times under

rated short-circuit breaking current

times 20

25Mechanical duration

times 1000026

SF6 gas leakage

SF6 /year 127

moisture content of SF6 gas(20)SF6(20) v/v 15010-6

28 Weight of SF6 gas for one set CB SF6 kg 12 1029

Temperature class

-30+40 -40+4030

Weight of one CB

kg 108831

Heater voltage

V AC220

8/2/2019 72.5 KV Catalog

4/15


4

3. Structure and working principle 3. 3.1 The three phases that are separated share one

common support and one CT26 spring operating

mechanism. The output bent arm of the mechanism

is connected with the circuit breaker through the rod.

The circuit breaker is composed by the interrupter,

pedestal, support and mechanism operating box. See

the details in fig1.

3.1 CT26 1

3.1.1 Interrupter

The interrupter adopts self-energizing theory. It

is the most important part of the circuit breaker

and is consist of the fixing contact support, fixed

contact, fixed arcing contact, moving contact,

moving contact support, moving arcing contact,

gas cylinder, nozzle and middle contact. The fixed

contact is fixed on the upper connection board.

The fixed contact support is filled with F-03

absorbent. The moving contact is fixed on the

lower connection board and is connected with the

wheel box through the insulating rod. See the

details in fig2.

3.1.1 F-03 2

3.1.2 Connection board (terminal.)

The connection board divides into the upper connection

board and the lower connection board. One connection

board has two terminals. Connection should be made

according to requirements. The connection board is

made of aluminum cast with silver. Dimension of the

connection hole is shown in fig.3.

3.1.2 3

3.1.3 Post bushing

The post bushing, under the interrupter, acts as a

support to the interrupter and the insulation to

the earth. It has high intensity and excellent air

tightness.

3.1.3

3.1.4 Wheel box

The wheel box, under the post bushing, delivers

the motion of the operating mechanism into gas

department to open or close the circuit breaker.

The type O shaped seal ring enclosed the SF6

gas in the wheel box. There are automatic cutout

valves on the side of wheel box. These valves are

3.1.4 OSF6

8/2/2019 72.5 KV Catalog

5/15


5

sealed when the connecting pipe is unconnected.

The thimbles in the connecting pipes will open

the valves to guarantee that the three gas

departments are connected when the connecting

pipes are connected.

3.1.5 Pedestal

The pedestal props the circuit breaker and

connects with the operating mechanism. It

carries operating load of the circuit breaker. A

gas density-pressure gauge is installed under the

pedestal to monitor the SF6 gas pressure.

3.1.5 SF6 SF6

3.1.6 Mechanism operating box

The Mechanism operating box that is fixed on the

pedestal is enclosed with CT26 spring operating

mechanism and secondary control panel. The

output bent arm of the mechanism is connected

with the bent arm of the wheel box under the

middle phase through the rod. There are two40incoming holes at the bottom of the operating

box.

3.1.6 8 M16 CT2640

3.2 Working principles 3.2 3.2.1 Working principle of interrupter

It is of the self-energized arc-distinguishing principle.

When breaking small inductive and capacitive

current or rated current, the gas pressure in the

cylinder and that out of the cylinder differs due

to the mechanical motion of the moving contact,

which distinguishes arcing.

When breaking short-circuit current, arc is

burning between the moving arc contact and the

fixed arc contact, and SF6 gas in the cylinder is

expanded, which increases the difference of the

gas pressure in the cylinder and that out of the

cylinder. Arcing is distinguished when current is

over zero.

3.2.1

SF6

3.2.2 Spring operating mechanism 3.2.2 The structure and the action principle are shown in fig.4. 4

8/2/2019 72.5 KV Catalog

6/15


6

3.2.2.1 Charging motor 3.2.2.1It adopts HDZ electromotor that can use DC or

AC power. The main data are shown in table.3.

HDZ 3.

Table3 3Rated operating voltage V

V DC: 220 AC:220Rated current of the motor A

A 2.8Range of the normal operating voltage

85%~110% rated operating voltage

85%110%Charging time at rated operating voltage sS Less than 15

Power of the charging motor

600W

3.2.2.2 Closing electromagnet 3.2.2.2It adopts solenoid type electromagnet. The main

data are shown in table.4. 4

Table4 4Rated operating voltage VV -110 -220Rated operating current AA 3.3 2.3

Resistance of the coil (20) 20 33 94

Range of the normal operating voltage 85%~110% rated operating voltage85%110% 3.2.2.3 Opening electromagnet 3.2.2.3It adopts solenoid type electromagnet. The main

data are shown in table.5.

5

Table5 5Rated operating voltage VV -110 -220

8/2/2019 72.5 KV Catalog

7/15


7

Rated operating current AA 5.8 2.8Resistance of the coil (20)

20 19 78

Range of the normal operating voltage65%~120% rated operating voltage; no opening in

continuous 3 operations at less than 30% rated voltage65%120% 30% 3

3.2.2.4 Auxiliary switch

F9-28I type auxiliary switch that has 14 couple of

N/O contacts and 14 couple of N/C contacts is

adopted. The continuous current of the contact is

not less than 10A.

3.2.2.4 F9-28 14 14 10A

3.2.2.5 Travel switch has a couple of N/O contact

and a couple of N/C contact. The continuous

current of the contact is not less than 5A.

3.2.2.5 5A

3.2.2.6 The continuous current of the connection

terminal is not less than 30A.

3.2.2.6 30A

3.2.2.7 Electric principle and wiring of the circuit

breaker are shown in fig11 and fig 11.1.

3.2.2.7 1111.1(

3.2.2.8 Charging of the operating mechanism

Closing spring is at uncompressed station. Theratchet pawl shaft(6) is connected with the

electromotor by gears. See the details in fig 4(A).

3.2.2.8 (1)(6) 4(A)

When charging, the electromotor forces the

ratchet shaft (6) to rotate clockwise; the two

ratchet pawls(5) on the ratchet shaft push the

ratchet wheel(3) to rotate counter clockwise

alternately to drive the dowel and rod on ratchet

wheel to compress the closing spring; the closing

spring drives the ratchet wheel to turn counter

clockwise about 2when the dowel reaches the lefttop point, and the charging holding dowel(4) onthe ratchet wheel is buttoned by the holding

detent(15) to finish charging. The electromotor is

cut off and the ratchet pawl departs from the

ratchet wheel at this time.

(6) (5)(3) 2 (4) (15)

3.2.2.9 Closing operation

The closing spring is charged when the breaker is

at opening state. See the details in Fig 4(B).

3.2.2.9 4B

8/2/2019 72.5 KV Catalog

8/15


8

When the mechanism receives the closing order, the

closing coil is to be electrified and the attraction of

the moving iron core of the closing electromagnet

drives the closing conduct rod to strike the closing

detent (13) to rotate counter-clockwise and releasesthe energy holding detent (15). Then, the closing

spring drives the ratchet to rotate clockwise with

high speed, and the cam(18)that is coaxial with the

ratchet beats the roller on the large bent arm(8)to

force the output bent arm (7) to move upward and

complete closing. At that time, the opening spring is

compressed to store energy to prepare for the

opening operation.

(13)(15) (3) (18)(8) (7) (16)

The closing operation can also be realized by attacking

the conduit of closing electromagnet by hand.

After finishing the closing operation, motor begins to

store energy for the closing spring again. The state of

the mechanism at this time is shown in Fig 4C.

4C

3.2.2.10 Opening operation

Both of the closing spring and opening spring are

charged when the breaker is at closing state.

3.2.2.10 (1)(16) 4(C)

When the mechanism receives the opening demand,

opening coil is to be electrified and the attraction of

the moving iron core of opening electromagnet drives

the opening conducted rod to strike the opening detent

(10) to revolve counter clockwise and releases the

closing holding detent (9).The opening spring drives

the bent arm to turn clockwise to force the main part

of the breaker to complete opening operation and the

large bent arm to move downward to press down the

closing holding detent to make the mechanism at the

opening state, see the details in Fig4 (B).

(10) (9) (16)(8) (9) 4(b)

The opening can also be competed by attacking

the conduit of opening electromagnet by hand.

3.2.2.11 Bound-resistant device

This mechanism is equipped with mechanical

bound-resistant device. Electrical bound-resistant

3.2.2.11

8/2/2019 72.5 KV Catalog

9/15


9

device is also on requirement. 3.2.3 The circuit breaker is designed with SF6

density-controller gauge with automatic monitor

function to the temperature compensation. Thegauge can not only display the pressure of SF6

gas but also amend the affect of pressure

difference arising from temperature change. The

gauge will send out alarm signal when the

pressure of gas in circuit breaker is lower than

the alarm value. The gauge will send out locking

signal when the pressure of gas in circuit breaker

is lower than the locking value.

3.2.3 SF6 SF6 20

4. Packing, transportation, check before

acceptance and storage

4.

4.1 Packing, transportation: The CB is disjointed

to pack and transport. The accompanying

documents should be delivered to the user by the

transporting unit. The gas compartments are

filled with SF6 gas (0.05Mpa). The main body of

the circuit breaker is at closing state; the

mechanism is at opening state and uncharged.

The packages are forbidden to be overturned,

inverted, impacted.

4.1 : 0.05MPa()SF6

4.2 Check before acceptance

As the circuit breaker arrived, users should

check the accompanying documents first. Then

open the packages with the transporter and

check the circuit breaker and accessory

according to the packing list. Please contact the

manufacturer in time if you have any question.

Pay attention to the bushing of the circuit

breaker when you open the packages.

4.2

4.3 Storage: The circuit breaker should be stored

at drying ventilated house without pollution, if it

wont be installed at once. If it wont be installedfor a long term, periodical check is necessary.

4.3

8/2/2019 72.5 KV Catalog

10/15


10

5. Installation and examining before

operation

5.

5.1 Foundation

The foundation dimension is shown in fig.8. The

height difference between the two sides of the

foundation should be within 2mm. The upward

dynamic loading is 20kN and downward dynamic

loading is 20kN.

5.1 8 2mm 20kN 20kN

5.2 Install the circuit breaker under the guidance

of manufacturers personnel(s).

5.2

5.3 Inflating:

5.3.1 The following procedure must be observed.

A. Lay the SF6 gas bottle on the ground, and

connect the pipeline to the decompression valve.

It is shown in fig.7.

B. Open the valve of gas bottle, then open the

pressure reduction valve to make the pressure at

low pressure side be 0.02~0.04MPa for 5-10

seconds to wash the pipeline.

C. Connect the pipeline to the automatic cutout

valve of drive box, then open the pressure

reduction valve slowly. The pressure difference

between pressure reduction valve and the circuit

breaker will not higher than 0.05MPa. When the

gas pressure of circuit breaker is near to the

rated value, inflating slowly to prevent too high

pressure.

D. Close the pressure reduction valve when the

pressure is equal to the rated filling pressure.

5.3 5.3.1 a. 7b. 0.02-0.04MPa 5-10 c. A 0.05MPad.

5.3.2 Adopting the leak hunting device with

sensitivity grade 10-6

to all the sealing planes after

the breaker is filled to the rated voltage. There

should be no leaking. Contact the manufacturer

immediately upon finding leaking.

5.3.2 10-6

5.3.3 Moisture Check 5.3.3 SF6

8/2/2019 72.5 KV Catalog

11/15


11

Users should check moisture in 24 hours after

inflating. The measured values should be in accordance

with fig9 about the moisture content-temperature curve.

24 95.3.4 manual charging of the mechanism is shown

in fig.10. The circuit breaker could be adjusted

thrown into operation when is filled with SF6 gas.

Power must be cut off.

5.3.4 10

5.4 Checkup before operation

5.4.1 Leakage Detect

Adopting the SF6 detector with flexibility not

lower than 10-6

to check the flange linking planes

and the connectors of the linking pipe in 24 hours

at the finish of gas filling.

5.4 5.4.1 10-6atmm3/s 24

5.4.2 Moisture Measuring

Connecting the needled-shaped pressure reduction

valve to the self-sealing valve to control the gas flow.

Then using micro-moisture detecting instrument to

measure the moisture which should be within 15010-6(v/v) at 20 at checkup and 30010-6 (v/v) at 20during operation.

5.4.2 5.3.3 9 150L/L20300L/L20

5.4.3 Main-circuit resistance measuring

DC pressure deduction method is adopted. measure the

main-circuit resistance which should be within 60ubetween the upper and the lower connection boards

when connecting with 100A DC current at close state.

5.4.3 100A 60

5.4.4 Insulation Checkup

a. There should be no flash and abnormal noise

when applying power frequency voltage to the

main circuit.

b. There should be no penetrationflash andother abnormal situation when applying 2000V of

power frequency voltage to the secondary circuit

for 1 minute, excluding the relay coil motor.

5.4.4a.

b. 2000V-1min

5.4.5 Measuring the opening and closing

synchronism and time under the rated operating

voltage.

5.4.5 ,

5.5 D04 moisture-resistant glum should be

smeared between the mechanical box and the

5.5 DO4

8/2/2019 72.5 KV Catalog

12/15


12

transition support. DO45.6 Connection of the Primary bus bar of the

Main Circuit and the Earthing Line

5.6

5.6.1 The incoming line and the outgoing line ofthe primary bus bar should be connected to the

upper and lower connection boards respectively.

The dimension of the open hole on the connection

board is shown in Fig3. The connection board

should be wiped with the white cloth submerged

with alcohol, while emery cloth is forbidden,

before connecting.

5.6.1 3

5.6.2 The earthing line should be connected to the

earthing bolt (with earthing symbol) on the

support.

5.6.2

5.7 Connection of the Secondary Circuit

Taking off the rubber glove under the mechanical

box and mounting with GBL connector which is

to be penetrated with incoming cable and

phase-to phase cable. Fig11 11.1 show thesecondary connection. The lead area should be

within 2.5 mm2.

5.7 11 11.1

5.8 Then it is the time to throw the breaker into

operation as soon as cleaning the site.

5.8

6. Maintenance and repair 6.6.1 Daily Maintenance

Do the following work one time every week:

a. observing and recording the gas pressure to see

whether it is normal

b. observing and the close and open indication

positions

c. observing the internal part of the breaker to

make sure there are no abnormal noise and over

heating

d. observing the motion of the mechanism to

make sure they are normal

e. checking the fixed nuts to make sure their

6.1 SF6a.b.c.d.

e.

8/2/2019 72.5 KV Catalog

13/15


13

fixedness.

6.2 annual check of circuit breaker

Short-time power cut and cut-down of the control

power should be guaranteed during annual

maintenance.

6.2

6.2.1 Clean the dirts on the surface of the porcelain.

6.2.2 Measure the micro-water content of the gas in

the breaker, and make a record.

6.2.3 Check the fixed nuts to make sure their

fixedness.

6.2.4 Check the upper and lower connection boards to

see whether there are overheating and color changed,

if do, using abrasive that is less than 250# to wipe the

boards then fixing the primary bus bar again.

6.2.5 The above procedure of the annual maintenance

could be done simultaneously and have no order.

6.2.1 6.2.2 6.2.3 6.2.4 250#6.2.5

6.3 supply the gas

If the density-pressure meter sends out an alarm

single during operation, gas should be supplied

during operation.

6.3

6.4 notes during check and repair 6.4 6.4.1 Closing or opening is forbidden when the

breaker is at vacuum state to avoid damaging the

parts of arc control device.

6.4.1

6.4.2 Lubricate the driving bent arm the rolling

parts.

6.4.2

6.4.3 Release the spring energy during examining

and repairing the mechanism. The way to release

energy is: do one cycle closing and opening

operation with power off.

6.4.3

7. Repair parts, special tools and accessories 7.7.1 repair parts

The repair parts were provided by the

manufacturer on users order. Table 6(1)62andtable 7 show the spare parts to be selected. The

7.1 6162 7

8/2/2019 72.5 KV Catalog

14/15


14

quantity regulated in the table in only for reference. Table6(1) 6(1)

No.Code No.

Name and specification

Quantity

Remark

1 5TK.177.007GGas-filling pipe

1

It should be connected with

pressure reduction valve in one end

and self-sealing valve in the other

end when filling gas to the breaker

2 5TK.253.027Special spanner1

1 1For manual charging

3 5TK.177.007

Connector for measuring

moisture

1

One end should be connected tocircuit beaker and the other should

be connected to the cone-shaped

pressure reduction valve.

Table6(2) 6(2)No. Code No. Name and specification Quantity Remark1

D04 water resistant glueD04FQ 2 Apply it on the water-resistant place2

7501 vacuum silicon grease

7501 1 Used for the gas seal gasket3

M2060 bolt ,flat washer andflexible washer

M2060 12 of eachUsed for the protection cover

of the support7.2 Spare parts providing according to the

contract

7.2

Table 7 7No. Type designate Name Quantity1 5TK.520.051.34 Opening and closing coils One for each1 HDZ-26005A

Motor 13 TZ7311

Travel switch 14 3TH30 22-1XM4 DC contactor 1

8/2/2019 72.5 KV Catalog

15/15


15

7.3 Accessories providing according to the

contract7.3

No.

Type designate

Name

Quantity

Remark

1 LF-1

SF6 detector 1 For detecting leakage2 DWS-

moisture measuring instrument

matched with cone-shaped pressure

reduction valve1

For measuring moisture3

SF6 gas

SF6 1 bottle For filling and evacuating4 YQY-07

Oxygen pressure reduction valve 1 For filling and evacuating5 2X-4

Vacuum pump 1For pumping

during maintenance8. Notice for Order

Please specify the following items when ordering.

a. type designate of the breaker and the mechanism

b. ratings including voltage, current, breaking

current and so on

c. ambient temperature

d. closing and opening operating voltage of the

operating mechanism, and the working voltage of

the charging motor

e. outgoing direction of the bus bar terminals

f. spare parts, auxiliaries, abbreviation, code No,

Quantity

8.a.b.()c.d.e.f.

9. Documents accompanying the machine

a. one copy of packing listb. one copy of qualification certificate

c. one copy of manual instruction.

9. a.b.c.

10. Drawings

See the drawings of Fig1 through Fig 12 in the

Appendix.

10. 1 12

72.5 KV Catalog

Documents

Transcript of 72.5 KV Catalog