transmission and distribution

Outdoor Load
Break Switch

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  • Range
  • Application and Design Features
  • Technical Parameters
  • Advantages vs. SF6
  • Advantages vs. Isolator
Manufacturer 11 kV 33 kV Load Break Switch Outdoor Type

Standards
IEC 62271-103

 

By Voltage Rating
11/12kV to 33/36kV

 

By Current Rating
630A to 1250A

 

By Short time current rating
16kA for 3 Sec

 

By Operating Mechanism
Motor Operated & Manual Operated

The load break switch is a great replacement for isolators as it provides with the ability to operate a full-load line without operating the circuit breaker. It can be used to carry out maintenance on the line without depending upon operation of the circuit breaker.

Some of the features are as below:

Parameters Values(11kV) Values(33kV)
Rated Voltage 11kV 33kV
Higher system voltage 12kV 36kV
Rated Normal Current 630A 630A
1 Min power Frequency (Across / Ph-Ground) 28/35kV 80/70kV
Impulse Voltage(1.2/50 us) (Across / Ph-Ground) 75/85kV 195/170kV
Rated Frequency 50/60Hz 50/60Hz
Rated short-time withstand current 16kA for 3 Sec 16kA for 3 Sec
Mainly active load breaking current 630A 630A
Operating Mechanism Motor & Manual Motor & Manual

Our load break switches are designed as per SF6-free solid di-electric air-break technology. Apart from the obvious environmental effects, our switches have the following advantages over SF6-filled counterparts:

 

ParametersAir Break / Solid StateSF6
CharacteristicsFault current making,
full load breaking
Fault current making,
full load breaking
Arc Extinguishing MediumAir / VacuumSF6 Gas
Effects on EnvironmentHarmless

SF6 becomes poisonous after passing of short current due to change in chemical composition

SF6 is 5x heavier than air. It will come into the breathing area.

SF6 gas is banned in most countries

SF6 gas effect on global warming is 20,000 times than that of CO2

Leakage and transportationNo leakage problemsSerious leakage chances due to handling and transportation
Site ServiceEasy replacement & repair of parts on-siteRepairable at works only. Cannot repair on site.
Future costsNone, just regular maintenance and greasingCostly gas refilling

The conventional isolators have been around for long, but they come with inherent disadvantages which limits their capabilities to quite an extent. Our load break switch is an upgrade from isolators because of the following advantages:

 

ParametersIsolatorLoad Break Switch
On−Load Voltage BreakingIncapableCapable
On−Load Full Current BreakingIncapableCapable
On−Load SCADA OperationIncapableCapable
Magnetic Current BreakingIncapableCapable
Motor OperationCumbersome, many linkagesProblem−Free , no linkages
Short Circuit Making CapabilityIncapableCapable, 16kA
Operating Speed10−15 seconds300 ms
Single Pole−mountableNot possible, 120 kgPossible, 60 kg only
VCB DependenceVCB has to be
operated before
Can be operated
without VCB backup
Maintenance & TamperHighLow
Alignment on siteCumbersomeFactory aligned
InstallationMultiple parts and sub−asslysAlready assembled, easy installation
OperationDepends on person to personSpring Operated. Independent of person
SafetyUnsafe for operator. Line may be LIVE.Safe. Designed to break LIVE line even in short circuit.

 

Manufacturer 11 kV 33 kV Load Break Switch Outdoor Type

Standards
IEC 62271-103

 

By Voltage Rating
11/12kV to 33/36kV

 

By Current Rating
630A to 1250A

 

By Short time current rating
16kA for 3 Sec

 

By Operating Mechanism
Motor Operated & Manual Operated

The load break switch is a great replacement for isolators as it provides with the ability to operate a full-load line without operating the circuit breaker. It can be used to carry out maintenance on the line without depending upon operation of the circuit breaker.

Some of the features are as below:

Parameters Values(11kV) Values(33kV)
Rated Voltage 11kV 33kV
Higher system voltage 12kV 36kV
Rated Normal Current 630A 630A
1 Min power Frequency (Across / Ph-Ground) 28/35kV 80/70kV
Impulse Voltage(1.2/50 us) (Across / Ph-Ground) 75/85kV 195/170kV
Rated Frequency 50/60Hz 50/60Hz
Rated short-time withstand current 16kA for 3 Sec 16kA for 3 Sec
Mainly active load breaking current 630A 630A
Operating Mechanism Motor & Manual Motor & Manual

Our load break switches are designed as per SF6-free solid di-electric air-break technology. Apart from the obvious environmental effects, our switches have the following advantages over SF6-filled counterparts:

 

ParametersAir Break / Solid StateSF6
CharacteristicsFault current making,
full load breaking
Fault current making,
full load breaking
Arc Extinguishing MediumAir / VacuumSF6 Gas
Effects on EnvironmentHarmless

SF6 becomes poisonous after passing of short current due to change in chemical composition

SF6 is 5x heavier than air. It will come into the breathing area.

SF6 gas is banned in most countries

SF6 gas effect on global warming is 20,000 times than that of CO2

Leakage and transportationNo leakage problemsSerious leakage chances due to handling and transportation
Site ServiceEasy replacement & repair of parts on-siteRepairable at works only. Cannot repair on site.
Future costsNone, just regular maintenance and greasingCostly gas refilling

The conventional isolators have been around for long, but they come with inherent disadvantages which limits their capabilities to quite an extent. Our load break switch is an upgrade from isolators because of the following advantages:

 

ParametersIsolatorLoad Break Switch
On−Load Voltage BreakingIncapableCapable
On−Load Full Current BreakingIncapableCapable
On−Load SCADA OperationIncapableCapable
Magnetic Current BreakingIncapableCapable
Motor OperationCumbersome, many linkagesProblem−Free , no linkages
Short Circuit Making CapabilityIncapableCapable, 16kA
Operating Speed10−15 seconds300 ms
Single Pole−mountableNot possible, 120 kgPossible, 60 kg only
VCB DependenceVCB has to be
operated before
Can be operated
without VCB backup
Maintenance & TamperHighLow
Alignment on siteCumbersomeFactory aligned
InstallationMultiple parts and sub−asslysAlready assembled, easy installation
OperationDepends on person to personSpring Operated. Independent of person
SafetyUnsafe for operator. Line may be LIVE.Safe. Designed to break LIVE line even in short circuit.