NEPSI

The Most Trusted Name in Power Factor Correction and Harmonic Filtering

MEDIUM VOLTAGE - TRANSIENT VOLTAGE SURGE SUPPRESSION "MV-TVSS"


NEPSI’s MV-TVSS™ (Medium Voltage Transient Surge Suppressor) offers the first line of defense from lightning and switching transients for commercial and industrial power systems that have service or utilization voltages from 2.4kV to 15kV.


Figure 1 - NEPSI's medium voltage transient surge suppressors protect commercial and industrial power systems from transients originating
from lightning and switching events.

PRODUCT SCOPE

  1. Operating Voltage: 2.4kV through 15kV

  2. Impulse Withstand Voltage (BIL): 60kV—200 kV

  3. MOV’s: Phase-to-Phase and Phase-to-Ground rated for your application; heavy duty distribution class are standard, station class provided as an option

  4. Current limiting fuses: Optional

  5. Metal-enclosed design: NEMA 1, 3R, 4X, 12 | IEC IP10, IP14, IP56, IP52, NEC Class 1 & 2, Div. II designs

  6. Surge Capacitor: Optional, 0.12μF—0.5 μF



Figure 2 - The MV-TVSS™ provides transient voltage protection from surges originating on the high voltage system by shunting them to ground
or across phases before they enter the low voltage system.

BENEFITS

  1. Provides an incoming line of defense for low volt-age TVSS systems which may not be capable of handling the surge energy transmitted from medium voltage systems.
  2. Simple low cost installation

  1. Reduced insulation failures from transient voltage surges that originate on medium voltage networks.
  2. Low maintenance.



HOW TO ORDER

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. Use Table 1 to determine base part number of MVTVSS based on your power system ground and your system voltage. Table 2 provides approximate dimensions, whileTtable 3 provides additional options that are not standard.


Table 1

MV-TVSS™ Standard Part Numbers
System VoltageRecommended Part Number
(kV RMS)
NominalMaximumFour-Wire Wye Multi-Grounded NeutralThree-Wire Wye Solidly-Grounded NeutralDelta, Resistive Grounded and Ungrounded Wye
2.42.54--MVTVSS1
4.16Y/2.44.4Y/2.54MVTVSS2MVTVSS3MVTVSS4
4.164.4--MVTVSS5
4.85.08--MVTVSS6
6.97.26--MVTVSS7
8.32Y/4.88.8Y/5.08MVTVSS8MVTVSS9-
12.0Y/6.9312.7Y/7.33MVTVSS10MVTVSS11-
12.47Y/7.213.2Y/7.62MVTVSS12MVTVSS13-
13.2Y/7.6213.97Y/8.07MVTVSS14MVTVSS15-
13.8Y/7.9714.52Y/8.38MVTVSS16MVTVSS17-
13.814.52--MVTVSS18


Table 2

MV-TVSS™ Dimensions and Weights
Part NumberHeight
(inches)
Width
(inches)
Depth
(inches)
Weight
(pounds)
MVTVSS-1 to MVTVSS-943.043.024.0310
MVTVSS-10 to MVTVSS-1851.047.028.0390


Table 3

MV-TVSS™ Part Number Suffix Codes
MV-TVSS™ OptionModel Number Suffix
Painted Stainless Steel Enclosure4X
Surge CapacitorSCF
Current Limiting FusesCLF
Station Class MOVSCMOV
Surge CounterCNT


For example, a MV-TVSS™ for a 13.8kV multi-ground neutral system with current limiting fuses and station class lightning arresters would have the following part number: MVTVSS16-CLF-SCMOV

Contact NEPSI for options and voltages not shown.


MV-TVSS WITH SURGE CAPACITOR AND OPTIONAL CURRENT LIMITING FUSES








MV-TVSS WITH SURGE CAPACITOR






GUIDE FORM SPECIFICATIONS

Guide Form Specification for MV-TVSS™

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