WEG VBWC Series Manual

Motors | Automation | Energy | Transmission & Distribution | Coatings
Installation, Operation and Maintenace Instruction
Instrucciones de Instalación, Operación y Mantenimiento
Manual de Instalação, Operação e Manutenção
Vacuum Circuit Breaker
Disyuntor a Vacío
Disjuntores a Vácuo

Vacuum Circuit Breaker -
Installation, Operation
and Maintenace Instruction
Series: VBWC
Language: English
Document: 10008260126 / 00
Date: 01/2021

Summary
1 SAFETY INSTRUCTIONS! 6
2 SAFETY PRECAUTIONS 6
3 UNPACKING AND SERVICE CONDITIONS 8
3.1 UNPACKING..........................................................................................................................................8
3.2 SERVICE CONDITIONS (INDOOR TYPE)............................................................................................8
4 TRANSPORTING, STORAGE AND DISPOSAL 9
4.1 TRANSPORTING..................................................................................................................................9
4.2 STORAGE..............................................................................................................................................9
4.3 DISPOSAL .............................................................................................................................................9
5 INSTALLATION 10
6 CONSTRUCTION FEATURES 12
7 CODING 13
8 ACCESSORIES 14
8.1 UNDER VOLTAGE TRIP DEVICE, [UVT] ............................................................................................15
8.1.1 Specionation of Remote Control Cables minumum gauge....................................................15
8.1.2 UVT assembly position and wiring diagram. ..........................................................................15
8.2 LATCH CHECKING SWITCH (LCS)....................................................................................................15
8.3 KEY LOCK...........................................................................................................................................16
8.4 “ON”,”OFF ” BUTTON COVER...........................................................................................................16
8.5 “ON”,”OFF ” BUTTON PADLOCK......................................................................................................16
9 STRUCTURE AND OPERATION 17
9.1 FRONT VIEW .......................................................................................................................................17
9.2 OPERATING METHOD FOR OPERATING MECHANISM .................................................................17
9.2.1 Manual operation ......................................................................................................................17
9.2.2 Remoto Operation.....................................................................................................................18
9.2.3 High-speed reclosing operation...............................................................................................18
9.3 OPERATING SEQUENCE ...................................................................................................................19
9.4 OPERATING FREQUENCY.................................................................................................................19
9.5 MAIN CIRCUIT ....................................................................................................................................20
9.6 VACUUM INTERRUPTER (VI).............................................................................................................20
10 MAINTENANCE AND INSPECTION 21
10.1 GENERAL CAUTION.........................................................................................................................21
10.2 ROUTINE INSPECTION....................................................................................................................21
10.3 PERIODIC INSPECTION...................................................................................................................22
10.4 SPECIAL INSPECTION.....................................................................................................................23
11 LUBRICANT POINTS FOR OPERATING PARTS 24
12 ELECTRICAL DIAGRAM 26
13 DIMENSIONAL 28

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6 | Vacuum Circuit Breaker
1 SAFETY INSTRUCTIONS!
Please read carefully this safety instructions before products are put into service;
This manual should be retained by those who in charge of maintenance and repair or ultimate users;
This instruction manual shall be kept within easy reach of users.
2 SAFETY PRECAUTIONS
Please follow the safety precautions which is to prevent users from any possible electrical accidents or dangers
in advance by using the product properly and safely.
Safety precaution is classified into three safety alert symbols, Danger, Caution, and Warning. The meanings are
as follows:
DANGER!
Not following this instruction may result in serious injury or even sudden death.
WARNING!
Not following this instruction may result in serious injury or even death.
CAUTION!
Not following this instruction may result in light injury or product damage.
The meaning of each symbol in this manual and on your products is as follows.
This is the safety alert symbol which is to warn users of dangerous situation or to call attention to careful operation.
Read and follow instructions carefully to avoid dangerous situation.
This symbol alerts the users to the presence of “dangerous voltage” which may result in an electric shock under specified
conditions.
DANGER!
Do not touch the electrically charged parts (Conductor and Terminal conducting parts)
under energized conditions.
Otherwise, it may result in severe physical injury or even death by electric shock.

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Vacuum Circuit Breaker | 7
WARNING!
1. Inspection and maintenance have to be performed by a qualified electrician.
Otherwise, there is the danger of malfunction, severe physical injury or electric shock.
2. When the circuit breaker is in service, don’t open the front cover.
Otherwise, there is the danger of severe physical injury or electric shock.
3. Do not contact the internal structure when front cover is opened.
Otherwise, there is the danger of severe physical injury or electric shock.
4. Inspection and maintenance have to be performed only after shutting off the electric power and
discharging a charge current.
Otherwise, there is the danger of severe physical injury or electric shock.
5. Please tighten the bolts and screw with specified torque.
Otherwise, there is the danger of over-heat or fire.
6. After performing installation, maintenance or inspection, remove some foreign objects like tools, wires or bolts.
Otherwise, there is the danger of short circuit or fire.
7. Do not move a circuit breaker by holding main circuit terminals.
Otherwise, there is the danger of an electric accidents by temperature rise.
CAUTION!
1. Do not alter the control circuit at one’s discretion.
Otherwise, there is the danger of malfunction or damage to products.
2. The circuit breakers must be kept in dry condition and keep away from the water.
Otherwise, there is the danger of deterioration of insulation.
3. This product must be stored at the place with no corrosive gas.
Otherwise, there is the danger of a product damage (discoloration, temperature rise or burns on contacts due to the
increased contact resistance).
4. When storing VCB for a long period of time, put dust cover on them to prevent dust from entering.
Otherwise, it may result in electrical accidents during the operation since dielectric strength gets reduced.

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8 | Vacuum Circuit Breaker
3 UNPACKING AND SERVICE CONDITIONS
3.1 UNPACKING
1. When unpacking the package, take care to handle the circuit breaker, standard components and accessories.
2. Certify that the instruction manual and a testreport of final testing were packed inside each PVC envelop.
3. If damage or breakage of products are founded, immediately notify WEG sales office or service representatives.
4. If damage or breakage of products by the carrier are founded, immediately file a claim with the carrier and
notify the shipping company.
3.2 SERVICE CONDITIONS (INDOOR TYPE)
1. Normal service condition
Design to IEC 62271-100(IEC 62271-1), with the following limits values:
Ambient temperature
Maximum: +40 ºC
Média máxima em 24 horas: +35 ºC
Minimum: -5 ºC
Maximum site altitude: ≤ 1000 m above sea level
Relative Humidity
24 hour average value: ≤ 95%
One month average value: ≤ 90%
2. Special service conditions
Special service conditions are to be agreed on by the manufacturer and user.
The manufacturer must be consulted in advance about each special service conditions using at the
following cases or places:
Higher level of site altitude or ambient temperature exceeding the normal conditions;
At place much influence by sea wind;
At a wet place with high humidity usually;
At places with much water or oil vapors;
At places with an explosive, flammable or noxious gas;
At places with much dust;
At places with abnormal vibration or impact;
At places with much ice and snow;
In case of using at other special conditions besides above cases.

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Vacuum Circuit Breaker | 9
4 TRANSPORTING, STORAGE AND DISPOSAL
4.1 TRANSPORTING
WARNING!
1. Do not move the circuit breaker by handling main circuit bus terminals.
Otherwise, there is the danger of electric accidents by temperature increasing.
1. Please use hook and rope to lift or transport the circuit breaker. The hook should be put into the designated
hole or position.
2. Before inserting circuit breaker into the electrical panel, please remove the lifting hooks.
3. When placing the circuit breaker on the ground, be careful not to drop or to impact the breaker.
Figure 4.1: Circuit Breaker
4.2 STORAGE
CAUTION!
1. The circuit breakers must be stored in clean, dry, dust and condensation- free environment.
Otherwise, may cause a weakness of insulation.
2. The products must be stored at the place with no corrosive gas.
Otherwise, there is the danger of a product damage (discoloration, temperature rise or burns on contacts due to the
increased contact resistance).
4.3 DISPOSAL
CAUTION!
1. When making a disposal, dispose it at a designated place with no affection to environment.
Otherwise, may cause an environmental pollution.
1. According to the ISO 14000, separate all of them as metallic or non-metallic material and dispose them at a
designated place after dividing all of material as renewable materials and other materials which may cause an
environmental pollution.
2. In case of being materials whatever you want to remake please contact us.
3. In case of special materials making noxious gas when destroying by fire, be sure to dispose them at an
approved place.

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10 | Vacuum Circuit Breaker
5 INSTALLATION
CAUTION!
1. VCB life span and performance can be guaranteed when periodic visual inspection and maintenance are in place.
It shall be kept clean by removing the foreign objects around or inside switchgear.
Corrective action shall be taken in advance to limit any dust and high humidity since they may result in unexpected
faults or accidents.
Switchgear door shall be well closed to prevent any kinds of animals goes into the switchgear and cause accidents.
Sufficient effort shall be made to maintain it in a dry condition if it is installed in presence of high humidity or during
the rainy season. Humidity is fatal to electricity.
Check if the cables or bars connected in the VCB presented fail in the isolation.
The corrective action shall be taken if the installation place has a higher or lower temperature than specified operating range.
2. Any incident or damage resulting from customers neglect or mistake will void the warranty.
WARNING!
1. Installing VCB at outdoor switchgear.
Extra care shall be taken to avoid condensation on the surface of VCB insulating materials by suitable ventilation or
inner heating.
Use after performing Insulation resistance or dielectric strength test. (More than one time per quarter).
The reduced dielectric strength can be a major factor causing short-circuit.
For safe and normal operation of circuit breaker installed in switchgear, a very careful and special installation
should be followed.
Handle with care when raising up by lift, etc. because circuit breaker lurches;
When installing a fixed type of circuit breaker into switchgear, fix the contactor with same torque value
by passing through mounting holes (6-Ø14) after inserting spring washers into head of bolt without high
pressure or alteration;
Take care not to apply pressure or permanent tension by bus bars or others to main bus terminals;
Remove dust or other foreign substances;
When bolting, follow the recommended torque value specified in Table 5.1.
WARNING!
1. When making bolts and screw assembling, follow the instruction with recommended torque values.
Otherwise, may result in over-heat or burns.
2. Do not alter the control circuit at one’s discretion.
Otherwise, may cause of malfunction or damage to products.
Torque
Size of bolt
Steel
(kgf·cm )
Brass
(kgf·cm)
M 3 7.3 (6.2 - 8.4) 4.3 (3.7 - 4.9)
M 3.5 11.2 (9.5 - 12.9) 6.6 (5.6 -7.6)
M 4 16.8 (14.2 - 19.3) 9.8 (8.4 - 11.3)
M 5 33.0 (28 - 37) 19.1 (16.2 - 22.0)
M 6 56.0 (48 - 65) 33.0 (28 - 38)
M 8 135 (115 - 156) 89 (68 - 91)
M 10 270 (230 - 310) 159 (135 - 182)
M 12 470 (410 - 540) 270 (230 - 310)
Table 5.1: Torque value