AEG VB2 Plus Vacuum Circuit Breaker User Manual

: June 3, 2024
: AEG

Table of Contents

VB2 Plus Vacuum Circuit Breaker
Overview
Structural principle
Technical parameter
Dimensions
Electrical schematic diagram
Installation, commissioning and operation
Maintenance
Transportation and storage
Random documents
Spare parts
References
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VB2 Plus Vacuum Circuit Breaker
VB2 Plus
User Manual

VB2 Plus Vacuum Circuit Breaker

Caution!
Please read this manual carefully before installing and using the circuit breaker:
The installation and use of circuit breakers must comply with the requirements of this manual.
Circuit breaker should be used in accordance with the normal indoor environmental conditions.
Any operation and maintenance of the circuit breaker should be carried out by professional trained full- time electrical personnel.
It is forbidden to operate the circuit breaker beyond its rated parameters.
Attention must be paid to any identification of circuit breakers
It is necessary to ensure the applicability and safety of interlocking conditions and working procedures of circuit breakers.
It is not allowed to carry out maintenance work when the switch cabinet and secondary control circuit are charged.
It must be ensured that the circuit breaker is not impacted by any external force, otherwise the equipment will be damaged.
Any illegal operation of the circuit breaker may damage the equipment and even cause serious accidents.
This manual should be placed in a convenient place.
Professional personnel should be responsible for the safety management of circuit breakers.

Overview

1-1 General:
VB2 plus indoor high-voltage vacuum circuit breaker is an indoor switchgear with three-phase ACv 50Hz and rated voltage of 12kV, which can be used for the protection and control of electrical equipment in power plants, substations and industrial and mining enterprises, and is suitable for places with frequent operation.
1-2 General provisions:
VB2 Plus breaker complies with the following standards：
GB/T 1984
High-voltage alternating-current circuit-breakers IEC 62271-100
High-voltage switchgear and controlgear – Part 100: Alternating curren circuit-breakers
IEC 60694 Common specifications for high-voltage switchgear and controlgear standards DL/T 403
HV vacuum circuit-breaker for rated voltage 12kV to 40.5kV
1-3 Normal operating conditions:
Ambient temperature
Maximum temperature:+ 40ºC
Minimum temperature: – 15ºC
Maximum daily average temperature: + 35ºC
Ambient humidity

Daily average relative humidity:	≤95%
Monthly average relative humidity:	≤90%;
Daily average saturated vapor pressure:	≤2.2×10 -3 Mpa
Monthly average saturated vapor pressure:	≤1.8×10-3Mpa

Altitude: ≤1000m, conventional products can be used below 1000m above s level, and high-altitude products need to be noted when ordering.
Earthquake intensity: No higher than Level 8
Others: no inflammable and explosion hazard, no chemical corrosive gas and no violent vibration.
Note: in case of different use environment or other special requirements, it is necessary to consult with the manufacturer.

Structural principle

2-1 Main structure
The conductive circuit of the circuit breaker is a fixed structure, and the conductive circuit is set in the insulating parts. This structure can effectively prevent the influence of external factors such as external force impact and pollution environment on the vacuum interrupter. The conductive circuit of the circuit breaker is installed at the back of the mechanism box and connected with the mechanism as a whole.
Primary circuit current route: when breaker is at the closing position, from the upper terminal to the static contact in the vacuum arc extinguishing chamber, through the oving contact and its connected soft connection, to the lower terminal, the insulating pull rod and the internal disc spring pass through the connecting rod of the circuit breaker to complete the operation movement of the circuit breaker and keep the contact.
2-2 Operating mechanism
The operating mechanism of the circuit breaker is a spring energy storage mechanism. There are closing unit, opening unit composed of one or several coils, auxiliary switch, indicating device and other components in the mechanism box; the front is provided with closing and opening button, manual energy storage operation hole, spring energy storage status indicator board and closing and opening indicator board.

AEG VB2 Plus Vacuum Circuit Breaker

Closing / opening indication
Energy storage indication
Counter
Closing button
Opening button
Manual energy storage operation
Nameplate
Fixed pole
Door opener
Chassis

2-2-1 Energy storage
The energy required for closing the circuit breaker is provided by the closing spring. Energy storage can be done either by motor or by hand with energy storage handle.
2-2-2 Closing
During the closing process, the circuit breaker can be closed no matter whether the “closing” button is pressed manually or the closing coil is activated by remote operation.
Note: when the circuit breaker is in the closing state, or the closing locking device is selected but the external power supply is not connected, and the handcart type circuit breaker is in the process of propulsion, the closing operation cannot be carried out.
2-2-3 Opening
Either press the “opening” button, or connect the external power supply to make the opening trip or overcurrent trip electromagnet act, so that the circuit breaker can realize the opening operation.
2-2-4 Undervoltage protection function When the secondary control voltage is less than or equal to 90% of the rated voltage, the undervoltage module must start to store energy for components and enter the holding state; when the secondary control voltage drops to 50% of the rated voltage, the energy of the undervoltage module is released to the opening coil of the circuit breaker to release the opening holding switch and the opening half shaft So as to realize the opening operation.
2-3 Anti misoperation interlock The circuit breaker can provide perfect anti misoperation function

After the closing operation of the circuit breaker is completed, the losing interlocking board 18 rotates against the closing board 13, and it cannot be closed again when the circuit breaker is not opened.
After closing the circuit breaker, if the closing electric signal is not removed in time, the internal anti tripping controller of the circuit breaker will cut off the closing circuit to prevent multiple reclosing.
When the handcart type circuit breaker fails to reach the test position or working position, the handcart interlocking board 19 shall buckle the closing board and cut off the closing circuit to prevent the circuit breaker from entering the load area in the closing state.
After the handcart type circuit breaker is closed in the working position or test position, the trolley will not be able to move if the roller presses the pushing mechanism, so as to prevent pulling out or pushing the load area in the closing state.
If electrical closing locking is selected, manual closing operation is prevented when the secondary control power supply is not connected.

Technical parameter

3-1 Main technical parameter

No.	Item	Unit	Value
1	Rated voltage	kV	12
2	Rated current	A	630/1250/1600/2000/2500/3150/4000′
3	Rated power frequency withstand voltage (1 min)	kV	42
4	Rated lightning impulse withstand voltage	75
Rated frequency		50
6	Rated short-circuit breaking current	kA	2531.540
7	Rated short-time withstand current(4s)	2531.540
8	Rated peak withstand current	6380100
q	Rated short-circuit making current	6380100
10	Rated operation procedure		0-0.3s-00-180s-CO
11	Contact distance	mm	9.01.1.0
12	Contact travel	3.5±0.5
13	Average closing speed	m/s	0.4-0.8
14	Average opening speed	0.9-1.3
15	Closing time (rated voltage)	ms	30-70
16	Opening time (rated voltage)	20-50
17	Closing bounce time	ms	s2
18	Three-phase opening/closing	ss2
19	Main loop resistance	[In	s 50(630A) : s 45(1250A);

s40(1600-2000A): s35(above 2500A)
20| Energy storage time| s| s10
21| Classification| class| E2-M2-C2

3-3 Technical parameters of operating mechanism and locking electromagnet

Rate voltage (V)| Energy storagemotor (A)| Closing coil (A)| Opening coil (A)| Lockoutelectromagnet(mA)
---|---|---|---|---
DC 110| 2.0| 2.| 2.| 35
DC 220| 1.0| 1.| 1.| 20

Dimensions

Withdrawable – 150mm apart
Withdrawable – 210mm apart
Withdrawable – 275mm apart
Withdrawable – 275mm apart

Electrical schematic diagram

Conventional circuit breaker products are equipped with anti-trip circuit, but according to the needs of users, the anti-tripping circuit can be removed. The internal wiring diagram of 64 core handcart type circuit breaker is shown in Fig. 1, 58 core internal wiring diagram is shown in Fig. 2.

Withdrawable (64 cores)

Optional wiring setting:

Option	Jumper wire	a-b	c-d	e-f	g-h	a-f	a-g	b-c	i-j	1-k
■ Anti-pumping relay	•Blocking coil	V	V	V	V	/	/	/	/	V
❑Blocking coil	/	/	/	/	V	V	V	V	V
❑Anti-pumping relay	•Blocking coil	41	V	V	V	/	/	/	/	/
❑Blocking coil	/	/	/	/	is/	V	•%/	ii	/
S9 : Limit switch	HQ : Closing coil	V1 -V4 : Rectifier
---	---	---
S8 : Limit switch	TO : Opening coil	KO : Anti-pumping relay(Optional)
S4: Auxiliary switch for blocking coil	RO-R1 : Resistance	Y1: Blocking

coil(Optional)
S1 -S3 : Energy storage position switch| aseci : Jumper terminal| GK-1: Controller
OF : Auxiliary switch| M : Energy-storage motor| SC: Overcurrent trip

Withdrawable (58 cores)

AEG VB2 Plus Vacuum Circuit Breaker -Withdrawable 2

Optional wiring setting:

Option	Jumper wire	a-b	c-d	e-f	g-h	a-f	a-g	b-c	i-j	1-k
■ Anti-pumping relay	•Blocking coil	V	V	V	V	/	/	/	/	V
❑Blocking coil	/	/	/	/	V	V	V	V	V
❑Anti-pumping relay	•Blocking coil	41	V	V	V	/	/	/	/	/
❑Blocking coil	/	/	/	/	is/	V	•%/	ii	/
S9 :	Limit switch	HQ : Closing coil	V1 -dV4 :	Rectifier
---	---	---	---	---
S8 :	Limit switch	TO : Opening coil	KO :	Anti-pumping relay(Optional)
S4:	Auxiliary switch for blocking coil	RCR1 : Resistance	Y1 :	Blocking

Installation, commissioning and operation

6-1 When the circuit breaker is lifted from the packing box, the hook shall be hung on the lifting position with lifting mark on the circuit breaker. When moving, the upper and lower outlet arms shall not be stressed, and the circuit breaker shall not be subject to large impact and vibration.
6-2 The circuit breaker installed in the switch cabinet shall not be subject to tension or deformation, and the bolt at the bottom mounting point shall be added with disc spring gasket. When connecting the main terminal, the main terminal shall not be subject to permanent tension and pressure (such as the bus bar). When connecting the bus, bolts with strength ≥ 8.8 and disc spring are used to fasten the bus.
6-3 Push the handcart type circuit breaker into the switch cabinet according to the following steps:
Swing the circuit breaker into the push in hole, clockwise to push in (counter clockwise to exit). The total driving distance is about 200 mm. In the opening state, you should enter the working position or test position smoothly. Please turn the handle at medium speed for 20 turns. When you hear the “click” position switch mechanism action ound, it is in place (do not damage the propulsion mechanism due to excessive force).
6-4 In case of problems in operation, determine the causes according to the table below. If it can’t be solved, please contact the manufacturer. Do not disassemble the circuit breaker by yourself.

No.	Fault phenomena	Reasons
1	Failure to closing	1.The breaker is in the closing position state

2.The handcart does not fully come into operation position or test position
3.The closing locking device is employed and the auxiliary supply is unconnected or lower than the specifications
4.secondary circuit is incorrect
2| The handcart cannot be pushed in or pulled out| 1 The breaker is in the closing position state
2 The pushing- handle is not fully inserted into the pushing hole.
3.The pushing mechanism is not fully placed at the test position, so that the clapper cannot be unlocked with the cabinet body
4.The cabinet body earthing interlocking is not released

6-5 The commissioning and operation work shall be carried out by specially trained personnel who have a detailed understanding of the performance of the circuit breaker. The corresponding protection and prevention measures must be considered in the work.
One of the preconditions for trouble free operation is to use the circuit breaker under normal working conditions according to the corresponding provisions of GB/T 1984 and IEC 60694 standards.

Check the circuit breaker for damage or any other harmful environmental impact. If there is such a phenomenon, it should be eliminated before power on to restore to normal working conditions.
Remove dirt, especially on the surface of insulating parts. These may be due to contamination during transportation or storage, which may affect the insulation performance of the product.
Check the connection status of primary circuit contact, secondary circuit connection and grounding body.
Manual operation test.

Maintenance

Maintenance must be carried out by AEG personnel or the user’s personnel who are familiar with the equipment and have been trained and qualified. If the maintenance is carried out by the user’s personnel, the user shall be responsible for the consequences of the repair.
7-1 During normal use, the circuit breaker is free of maintenance. Because the circuit breaker has the characteristics of simple structure and durability, it has a long service life. The maintenance work is related to the wear and aging of parts. In order to make the circuit breaker work reliably, the interval time and range of maintenance work needed to be carried out will depend on the influence of working environment, operation times, operation time and short circuit current breaking times and other factors.
7-2 Before maintenance, all auxiliary power supply must be disconnected and there is no danger of power transmission again. The circuit breaker itself is open and the spring is not stored energy. In order to prevent accidents, special care should be taken in the operation mechanism.
7-3 Disassembly and replacement of circuit breaker parts shall be carried out by AEG personnel or corresponding trained personnel, especially during reassembly, necessary adjustment shall be made.
7-4 Maintenance of circuit breaker
a. The operation structure shall be inspected when the circuit breaker has been operated for 5 years (from the day when the new equipment is put into operation) or when the circuit breaker operates for the specified times (5000 times for the circuit breaker with 25kA and below, 4000 times for the circuit breaker with 31.5kA, and 2500 times for the circuit breaker with 40kA)：

Cut off the energy storage power supply and operate the circuit breaker to close and open once to release energy.
Check the grease condition of rolling or sliding bearing surface.
Check the correctness of each component function during electrical and mechanical action.
Do a comprehensive appearance inspection。
b. The operation structure shall be maintained after 10 years of operation (calculated from the day when the new equipment is put into operation) or the operation times of the circuit breaker (25 Ka and less than 10000 times, 31.5 Ka circuit breaker for 8000 times, 40 Ka circuit breaker for 5000 times):
Cut off the energy storage power supply and operate the circuit breaker to close and open once to release energy.
Re apply grease to supporting shaft, rolling and sliding bearing.
Check the correctness of each component function during electrical and mechanical action.
Check the condition or looseness of fasteners installed at connecting rod, crank arm and supporting rod.
During maintenance, it is important to check the parts which are subjected to high stress during operation.
In case of replacement of parts, all fasteners shall be replaced.
Comprehensive review of operating mechanism.

7-5 After the circuit breaker has been running for about 5 years or when the operating mechanism is under maintenance, the circuit breaker body should also be inspected. Especially when inspecting the appearance, it is also necessary to check the contamination, damp and corrosion of the equipment surface. Clean the dust on the surface of insulating parts with dry cloth, and then wipe all kinds of dirt with silk cloth with household alkaline cleaning agent or safety cleaner (pay attention to whether the detergent used is applicable to plastic and synthetic rubber materials), and do not use carbon tetrachloride or trichloroethylene to wipe.
The minimum interval of the above inspection work shall be less than 5 years for the switchgearoperating in some special use occasions or under harmful environmental conditions (such as in theenvironment with high pollution and heavy corrosive gas).

Transportation and storage

8-1 When the product is transported, the circuit breaker shall be placed in a closed packing box without energy storage, and a proper amount of desiccant shall be built in. The circuit breaker shall be protected with plastic film to prevent water penetration during loading and unloading and dust intrusion during storage.
8-2 The following tools shall be used to load and unload the packing box

Crane
Forklift
Driving

8-3 Pay attention to the following items during transportation:

Avoid shocks
Avoid other destructive mechanical forces
The lifting appliance should not be hooked on the circuit breaker body or operating mechanism. It should be hooked at the lifting position with lifting mark.
8-4 The circuit breaker shall be stored in the state of opening of operating mechanism and energy storage spring without energy storage.
Basic storage requirements
The dry and well ventilated storage room shall meet the relevant provisions of GB /T 1984 and IEC 60694.
The temperature of the storage room shall not be lower than – 15 ° C.
Do not disassemble or damage the package. Cover with a protective light covering and maintain adequate ventilation.
Regularly check whether there is condensation phenomenon and other conditions not suitable for storage requirements.