Medium-voltage switchgear

Type EH-MVSg-24

A switchgear is a device consisting of interconnected fields with specific functions, e.g. switching, measuring or protection. The switchgear is designed for use in installations with a rated voltage of up to 24 kV and is used in industrial applications as well as in renewable energy  and in the commercial power industry for the secondary distribution of electricity.

Specification

Distinctive features

Modern production technology

The switchgear utilises vacuum technology and SF6 gas insulation, ensuring the compact dimensions of the switchgear fields.

Wide range of applications

The switchgear is designed for use in installations with a rated voltage of up to 24 kV and is used in both industrial applications and in the distribution of electricity in the commercial power industry.

Safety at work

The electrical safety devices and the control system and interlocks ensure safe operation and use of the machine.

Technical
specification

Rated data

Technical parameters of the medium-voltage switchgear type EH-MVSg-24

Rated voltage Ur, kV 12 17,5 24
Frequency fr, Hz                 50/60
Rated current Ir, A                 up to 630
Rated lightning impulse withstand voltage 1.2/ 50 ms to earth and between phases Up, kV (peak) 75 95 125
Rated lightning impulse withstand voltage 1.2/ 50 ms safe insulation distance

Up, kV (peak)

 85 110 145
Insulation level 1 min. / 50 Hz to earth and between phases Ud, kV (RMS) 28 38 50
Insulation level 1 min. / 50 Hz safe insulation interval Ud, kV (RMS) 32 45 60
Short-term rated current Ik, kA                16
Rated short-circuit duration tk, s                 1
Rated peak withstand current Ip, kA                 40
Internal arc resistance IAC 1s [kА]                 16
Protection level For gas-filled containers     IP65
For the switchgear                            IP2X / IP3X

Dimensions and weights

A mm B mm C mm D mm

500

750

 1000 290

250

300

Type 12 kV; 17,5 kV 24 kV
500 mm 750 mm 500 mm 750 mm
EH-I  170 kg
EH-TM 188 kg
EH-ITI 355 kg 380 kg
EH-MAS  350 kg 360 kg

Field functions

Typ Functions Field name
EH-I Inlet or outlet with disconnector-earthing switch Line field
EH-TM Disconnector feeder with fuse and earthing switch Transformer field
EH-ITI Disconnector feeder with circuit-breaker and earthing switch Circuit breaker panel
EH-MAS Measurement from current and voltage transformers Measuring field

Line diagrams

Line field EH-I Transformer field

EH-TM

 Circuit breaker panel 

EH-ITI

 Measuring field

EH-MAS

Distributive fields

Upper range SN

This is a busbar compartment designed for the installation of copper busbars, forming a three-phase busbar bridge connecting
the individual switchgear panels in the switchgear’s electrical system. Depending on the type of panel, the upper compartment can be equipped with an additional superstructure for installing current transformers that are connected directly to the busbars of the switchgear.

Lower range of MV

This is the compartment in which the switching, measuring and cable equipment is installed, depending on the type of panel, e.g. circuit breaker, switch, earthing switch, measuring transformers, fuses, surge arresters, cable connections.
Depending on the type of panel, the lower compartment is a compartment for inserting and connecting cables/wires with installed cable heads.

LV range

This is a compartment in which low-voltage equipment such as auxiliary and guaranteed voltage power supplies, auxiliary relays, field controllers, power quality analysers, telemechanics components and other control and measurement equipment are installed, depending on individual requirements. Depending on the type of field, the low-voltage compartment can be used to install components that perform the functions of an in-house switchboard or SCADA systems, for example.