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G&W Viper-S and Viper-ST three phase reclosers now have the option of incorporating six integral capacitive voltage sensors to allow for voltage measurement on both the line and load sides of the device without the need for costly and heavy potential transformers. This makes G&W Viper reclosers with Six Voltage Sensors (6VS) ideal for distribution automation applications and loop or network reconfiguration schemes.

 

Applications

  • Open Bus-Tie Breaker - Either substation mounted or overhead, where the presence or loss of voltage is used to trigger the tie breaker to close and restore power.
  • FDIR - Fault Detection Isolation and Restoration where communications are used between recloser controls to operate and restore power. In the event there is a loss of communication and six voltages are being monitored, the recloser control can even be programmed to deploy FDIR without the need for communications, providing the highest level of reliability.
  • Automatic Transfer - To monitor two independent source voltages. Six Voltage Sensing permits the control to sense loss of voltage on the primary source and verify a stable voltage reading on the secondary source which asssures a proper, safe transfer even if communications is lost.
  • Distributed Generation - Where the electric grid is synchronized with backup generators. Having six voltage sensors allows the recloser control to monitor phase angle and voltage amplitude of each phase to close the recloser safely when connecting the generator to the grid.

 

Operation

Six Voltage Sensing is accomplished through capacitive voltage dividers embedded in the epoxy insulation of each phase of the recloser. The sensors have a Low Energy Analog (LEA) output.  The capacitive voltage sensors are isolated from the grid and are able to read phase angle and voltage amplitude with a relatively high accuracy. The sensors do not provide power to the recloser control. External sources such as PTs can be supplied to power the relay.

 

Accuracy

The voltage sensors have been tested in a third party laboratory. Voltage sensing amplitude accuracy is +/-2% when tested as a system from -10°C (14°F) to +45°C (113°F). The VS accuracy is +/-4% at -40°C (-40°F) to +65°C (149°F). The phase angle accuracy is +/-1° throughout the full temperature range. Current monitoring is provided through integral multi-ratio current transformers encapsulated within the module of each phase. Ratios available are 1000:1 or 500:1. Inputs to the control are field changeable. CT accuracy is +/- 1%.

 

Features

  • Operator Safety - Vacuum interrupters are sealed within solid dielectric insulation providing fully shielded modules. The module housing, being at ground potential, provides additional safety. A hookstick operable, manual trip and lockout handle prohibits operation either from the control or remotely. A mechanical blocking device further assures against accidental close through the handle. An open and closed contact indicator verifies contact position. Contact status and lock-out condition can also be verified at the control.
  • Reliability - Having both the current and voltage sensors embedded into the epoxy module protects them from environmental damage or contamination and makes for a cleaner, and less cluttered installation. Other manufacturers must use expensive, external add-on sensors or potential transformers to accomplish the same functionality which can significantly increase installation costs and result in a much more congested appearance.
  • Compact, Lightweight Construction - Built-in sensors eliminate the need for heavy, add-on potential transformers or other sensors significantly reducing the overall weight of the installation. The Viper-ST has one single control cable that brings all voltage, current, breaker status and trip/close information into the control. The Viper-S comes with a 19-pin interface and an 8-pin cable for the voltage sensors.

 


Voltage Class (kV) 15 25 35
Maximum Design Voltage, kV 
15.5
27
38
BIL (kV)
110
125
150
Continuous & load break current, A
800
800
800
8-hour Overload, at 20°C
960
960
960
Interrupting Rating RMS (kA) 12.5 12.5 12.5
Making Current, RMS, asym (kA) 20 20 20
Peak, asym (kA) 32 32 32
Short Circuit Current, kA sym., 3 second 12.5 12.5 12.5
60Hz Withstand, kV rms
  One minute (dry)
  10 second (wet)

50
45

60
50

70
60
Mechanical operations
10,000
10,000
10,000

 

 

 

FEATURES

VIPER-S

VIPER-ST

Basic Features

6VS LEA

S

S

Mechanically Ganged

S

-

Triple Option

-

S

Trip/Lock out Handle

S

S

Mechanical Block

S

S

Removable Silicone Insulators

S

S

Magnetic Actuator

S

S

Trip Spring

S

S

Grounded Solid Dielectric Modules

S

S

Polemount Frame

S

S

Integrated 1000/500: 1 CTs

S

S

Dead-line Operation

S

S

“L” Shaped Modules

S

S

32-pin Interface

-

S

19-pin Interface

S

-

Other Features

Six 0-144 VAC Analog VS

O

-

14-pin Interface without dead-line operation

O

-

Site-Ready Design

O

O

Substation Frames

O

O

External CTs

O

O

Customized Frames

O

O

Control Packages

SEL-651R

S

S

Other Custom Relay Solutions

O

-

 
 
Legend
Standard = S
Option = O
Not Applicable =  - 

 

Control Connections - Twist style connectors make cable connection between control and recloser extremely easy. The traditional 14-pin recloser control connector design is the same as other "Cooper" style reclosers permitting easy change out of previously installed controls and/or reclosers. Control Capabilities - Various style controls are available depending upon application requirements. Typical control settings include: *Minimum trip for phase, ground and sensitive ground faults. *Numerous preprogrammed and user-defind time current curves for sensing phase or ground faults. *Three independent recloser interval times. Capable of up to four shots to lockout. *Reset time. *Sequence coordination. *Cold load pickup. *Advanced parameters. Refer to control specifications for more details.

 

The Viper-ST with six voltage sensors works with the SEL-651R control. Typical features of the SEL-651R include:

  • Six voltage inputs necessary for loop scheme designs
  • Full line metering capabilities using the voltage inputs from the internal sensors
  • Programming to recognize seasonal loads and shift between three phase and single phase trip/close modes for optimal system efficiency
  • For loop schemes the control can be programmed to act as a recloser “looking” in either direction
  • Minimum trip for phase, ground and sensitive earth faults
  • Capable of up to four shots to lockout
  • Sequence coordination
  • Harmonics up to the 15th for the THD analysis
  • Cold load pickup

Control Connections - A twist lock style connector makes the cable connection between the control and the interrupter control box. AC power provides the normal supply power to the control.


Drawings (Click Image to Enlarge)

 


 



 
 
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