NEPSI's MV-TVSS (Medium-Voltage Transient Voltage Surge Suppression Equippment Reduces Insulation Failures from Transient Voltage Surges that Originate on the Medium Voltage Network.

 

  Three-Line Diagrams
  Autocad 2000 Format
  DXF Drawing Exchange Format
 

 

  
  Elevation Drawings
  Autocad 2000 Format
  DXF Drawing Exchange Format

Feel Free to Start With Above Drawing Files For Development of your Specifications
  MV-TVSS, Medium Voltage Surge Suppression - Standard Specification
  Microsoft Word Format
  Rich Text Format
 
If the above specifications does not meet your requirements, NEPSI will work with you to develop a specification that conforms to your specific application.


MV-TVSS Product Bulletin

Medium Voltage Transient Voltage
Surge Suppression

NEPSI's MV-TVSS™ offers the first line of defense from transient voltages for commercial and industrial facilities that have service or utilization voltages from 2.4kV to 15kV.

Product Scope
  • Reduced insulation failures from transient voltage surges that originate on medium voltage networks.
  • Provides an incoming line of defense for low voltage TVSS systems which may not be capable of handling the surge energy transmitted from medium voltage systems.
  • Simple to install and requires no maintenance.
  • Low Initial Cost.
  • Surge Portection for Line-Line and Line-Ground Connected Equippment.
Application

The MV-TVSS™ system is designed for facilities which utilize or receive power at voltages from 2.4kV to 13.8kV. In many industrial and commercial facilities, the segregation of sensitive electronic equipment from the high voltage system is not possible, nor practical. The isolation transformer or step down transformer to the lower utilization voltages does not provide adequate protection from surges generated or induced on the higher voltage systems. The MV-TVSS™ provides transient voltage protection from surges originating on the high voltage system by shunting them through a low impedance path before they enter the low voltage system.

Utility Generated Transients and
Lightning Protection

This MV-TVSS™ provides protection from utility generated switching surges or lightning induced surges. The utility or power companies have little or no control over transient voltages induced by lightning or high power switching surges which are generated near your facility. Current surges from lightning can enter into a facility through overhead conductors or buried cables. These surges propagate in the form of traveling waves bi-directionally from the point of origin. The surge that travels toward the utility are shunted to ground by pole mounted surge arresters. The surge which travels towards your facility may not be suppressed or adequately suppressed for the protection levels required by your sensitive electronic equipment and insulation system. The MV-TVSS™ can provide the required protection.

Internally Generated
Transients

The MV-TVSS™ can also provide switching surge protection for transients voltages generated within your facility. When ever a breaker or contactor is closed or opened, a transient is generated. This transient activity can create a high voltage known as an inductive kick. This inductive kick can be as many as 10-20 times the system rated voltage. For example a 4.16kV system can experience a transient switching voltage as high as 83.2kV. The MV-TVSS will shunt these surges to ground.

Standard Features

Enclosure
11 Gauge Galvanneal Steel all welded construction. Base of unit consists of C2 structural steel channel for floor mounting and skidding into place. Optional wall mounting flanges are available on request. Meets NEMA requirements for 1, 3R, 4X, and 12. An "L" shaped gasketed cover with multiple stainless steel fasteners provides front access for installation and maintenance. As an option, the units can be fabricated from stainless steel.

Terminals
The MV-TVSS is provided with a Copper NEMA 2-hole pad for interconnection with customer wiring.

Surge/Lightning Arresters
The MV-TVSS is equipped with heavy duty, silicone rubber housed MOV lightning arresters incorporating the latest in metal oxide varistor (MOV) design techniques. The high track resistant, non-framenting silicone rubber housed arrester provides increased safety for personnel and equipment. The lightning arresters complies with the latest revision of ANSI/IEEE C62.11 "IEEE Standard for Metal Oxide Surge Arresters for AC Power Circuits.

Warranty
5 year replacement on parts

Operating Temperature
-40F (-40C) to +115F (+46C)

Optional Features
Wall mounting flanges
Allows the MSP to be mounted on a wall.

Fuses
Provides fault protection to the capacitors and surge arresters.
Surge Capacitor
The MV-TVSS can be equipped with a hermetically sealed low-loss, low-inductance surge capacitors. This capacitor will reduce the rate-of-rise of incoming surges and allow for better transient voltage surge protection.

MV-TVSS
Ordering Guide

The MV-TVSS can be ordered by choosing the part number from the table below based on the system voltage and type of grounding. Options are ordered by adding part number suffixes.

Catalog Numbers: MV-TVSS Ô

System Voltage

Recommended Part Number
(kV RMS)

Nominal

Maximum

Four-Wire Wye: Multi-grounded Neutral

Three-Wire Wye: Solidly Grounded Neutral

Delta, Resistive Grounded andUngrounded Wye

2.4

2.54

-

-

MVTVSS1

4.16Y/2.4

4.4Y/2.54

MVTVSS2

MVTVSS3

MVTVSS4

4.16

4.4

-

-

MVTVSS5

4.8

5.08

-

-

MVTVSS6

6.9

7.26

-

-

MVTVSS7

8.32Y/4.8

8.8Y/5.08

MVTVSS8

MVTVSS9

-

12.0Y/6.93

12.7Y/7.33

MVTVSS10

MVTVSS11

-

12.47Y/7.2

13.2Y/7.62

MVTVSS12

MVTVSS13

-

13.2Y/7.62

13.97Y/8.07

MVTVSS14

MVTVSS15

-

13.8Y/7.97

14.52Y/8.38

MVTVSS16

MVTVSS17

-

13.8

14.52

-

-

MVTVSS18

For Options Add Suffixes Below

 

Part Number Suffixes For MV-TVSS
Optional Features

Wall Mounted Flanges

WMF

Current Limiting Fuses

CLF
Surge Capacitor Filter
SCF

For example, an MV-TVSS for a 13.8kV Multi-ground system with the wall mounting brackets would have the following part number: MVTVSS16WMF

Contact the factory or your nearest sales representative for options and voltages not shown.

MV-TVSS Three-Line Diagram

Figure 1 - Three-line Diagram of MV-TVSS. MV-TVSS Should Be Connected in Parallel and as Close as Possible to the Equipment Being Protected.

Notes:
1) Custom designs available on request.
2) Inside components shown as solid lines.

MSP Dimensions, Weights,
and Electrical Values
Part
Number 		H
(Inches) 		W
(Inches) 		D
(Inches) 		Weight
(Pounds)
MVTVSS1 34.0 30.0 30.0 310
MVTVSS2 34.0 30.0 30.0 310
MVTVSS3 34.0 30.0 30.0 310
MVTVSS4 38.0 34.0 30.0 420
MVTVSS5 38.0 34.0 30.0 420
MVTVSS6 38.0 34.0 30.0 420
MVTVSS7 38.0 34.0 30.0 420
MVTVSS8 38.0 34.0 30.0 420
MVTVSS9 38.0 34.0 30.0 420
MVTVSS10 44.0 40.0 33.0 470
MVTVSS11 44.0 40.0 33.0 470
MVTVSS12 44.0 40.0 33.0 470
MVTVSS13 44.0 40.0 33.0 470
MVTVSS14 44.0 40.0 33.0 470
MVTVSS15 44.0 40.0 33.0 470
MVTVSS16 44.0 40.0 33.0 470
MVTVSS17 44.0 40.0 33.0 470
MVTVSS18 44.0 40.0 33.0 470

Figure 2 - Typical Enclosure Configuration Showing
Outside Dimensions

Note:
1) Dimensions may change without notice. Confirm dimensions on placement of order.
2) Dimensions may change without notice. Confirm dimensions on placement of order.

 

Northeast Power Systems, Inc.
66 Carey Road
Queensbury, New York 12804
Phone: 518-792-4776
Fax: 518-792-5767

E-mail: sales@nepsi.com
Website: www.nepsi.com

 

 

 

 

 

Download Medium Voltage Automatic Capacitor Bank Specification in Microsoft Word Format Download Medium Voltage Automatic Capacitor Bank Specification in Rich Text Format