Low voltage regulation system - A. Eberle€¦ · · 2016-06-22The low voltage regulation system...

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Technical Data

Low voltage regulation system

LVRSys™

0 Power range 55 kVA – 400 kVA

0 Regulation range: ±6 % / ±10 %

0 Phase spacing: 1.5 % / 2.5 %

0 Overall efficiency 99.7 %

0 Phase-independent regulation

0 Voltage tolerance band parametrisable

0 No grid interference

1. Application

The low voltage regulation system LVRSys™ repre-

sents a cost-effective alternative for grid expansion.

The economic use is recommended in all low voltage

grids where short-circuit power is sufficient, but have

voltage maintenance problems.

Voltage maintenance problems can occur locally (in

single lines) or at the level of the entire low voltage

grid. LVRSys™ can be used with flexibility as line regu-

lator or as direct regulator on the local grid station.

Voltage profile, with and without LVRSys™

Regulation of bus bar voltage

The direct regulation of the bus bar via LVRSys™ is

comparable with the function of an adjustable local

grid transformer. A pre-condition for this application is

the uniform occurrence of voltage maintenance over

the entire low voltage grid. This occurs if the distribu-

tion of decentralised "feeders" is homogeneous.

Regulation of the line voltage

If single lines are affected by voltage maintenance

problems, it is economically to use LVRSys™ as line

regulator (linear regulator). The powers to be regulat-

ed are low and hence the use of the system is cost-

efficient. A classical application example would be a

grid branch with multiple photovoltaic extensions

(PV).

We take care of it.

2. Functioning

The principle of the LVRSys™ control is based on a

linear regulator. By coupling and uncoupling two

transformers with selected transfer ratios, it is possi-

ble to regulate the output voltage in 9 steps. The

regulation range can be selected from ±6 % (phase

spacing 1.5 %) to ±10 % (phase spacing 2.5 %). The

transformers are controlled using thyristors. These

solid state electronic components are characterised by

robustness, easy maintenance and short-circuit re-

sistance. The stages of the transformers are

determined by setting the switching of the thyristors

in the following fashion.

Step Transformer

1.5%/2.5%

Transformer

4.5%/7.5%

-6 % / -10 % -1.5 % / -2.5 % -4.5 % / -7.5 %

-4.5 % / -7.5 % 0 % / 0 % -4.5 % / -7.5 %

-3 % / -5 % +1.5 % / +2.5 % -4.5 % / -7.5 %

-1.5 % / -2.5 % -1.5 % / -2.5 % 0 % / 0 %

0 % / 0 % 0 % / 0 % 0 % / 0 %

+1.5 % / +2.5 % +1.5 % / +2.5 % 0 % / 0 %

+3 % / +5 % -1.5 % / -2.5 % +4.5 % / +7.5 %

+4.5 % / +7.5 % 0 % / 0 % +4.5 % / +7.5 %

+6 % / +10 % +1.5 % / +2.5 % +4.5 % / +7.5 %

Generating voltage steps by use of thyristors

The control signals for the thyristors are generated by

driver circuits which switch the thyristors intelligently.

Taking into consideration the magnetic flow in the

transformers, these can be switched to generate

smooth current without voltage dips or over-voltages.

controller

4,5%

transformer

1,5%

transformer

+4,5% -1,5% = +3%

Example of 3 % voltage reduction

3. LVRSys™ application locations

LVRSys™ can be used in various ways. Applications

range from "regulation street distribution boxes" up

to regulation entire local grids.

LVRSys™ as local grid regulator

LVRSys™ as regulator of an outgoing circuit

LVRSys™ as line regulator

The "balancing" of the three phase voltage additional-

ly improves grid quality, as shown by the following

power consumption of a line regulator.

Unregulated input voltage LVRSys™

Regulated output voltage LVRSys™

4. Technical Data

Operating temperature -40 °C to 45 °C

Maximum permitted air temperature in the switch

cabinet

70 °C

Altitude of the installation (NN) < 2000 m

Safety class IP 54

Rated voltage �� 400 V/230 V ±20 % (L-L/LE)

Rated current �� 80 A (55 kVA system)

160 A (110 kVA system)




Rated frequency �� 50 Hz

Efficiency 99.7 %

Standard regulation range

Extended regulation range

±6 % of ��

±10 % of ��

Step number/Distance 6 %

Step number/Distance 10 %

9 / 1.5 %

9 / 2.5 %

Switch cabinet dimensions W/D/H

120 cm/40 cm/135 cm (55 kVA system ±6 %)









We take care of it.

Weight switch cabinet

200 kg (55 kVA system ±6 %)

240 kg (55 kVA system ±10 %)

230 kg (110 kVA system ±6 %)

280 kg (110 kVA system ±10 %)

320 kg (175 kVA system ±6 %)

400 kg (175 kVA system ±10 %)

430 kg (250 kVA system ±6 %)

550 kg (250 kVA system ±10 %)

540 kg (400 kVA system ±6 %)

Dimensions of ground base W/D/H

120 cm / 40 cm / 100 cm (55 kVA system ± 6 %)

120 cm / 40 cm / 100 cm (55 kVA system ±10 %)








Weight of ground base

260 kg (55 kVA system ±6 %)

260 kg (55 kVA system ±10 %)

260 kg (110 kVA system ±6 %)

280 kg (110 kVA system ±10 %)

280 kg (175 kVA system ±6 %)

280 kg (175 kVA system ±10 %)

300 kg (250 kVA system ±6 %)

300 kg (250 kVA system ±10 %)

300 kg (400 kVA system ±6 %)

Max. power consumption of secondary electronics 300 mA (230 V)

Cooling - passive (convection via switch cabinet housing)

- active (redundant ventilation system)

(depending on the application conditions)

Short-circuit impedance �� approx. 0.3%

Maximum phasing duration 30 ms

Noise emissions < 30 dB(A)

EMC stability DIN EN 61000-6-1

EMC interference emission DIN EN 61000-6-3

Assembly instructions DIN EN 61439-1/5

Low voltage directive 2014/35/EU

5. Installation

LVRSys™ is suitable for inside as well as outside mount-

ing. Cable routing takes place from beneath the switch

cabinets. If mounted outside, a base is needed. The

base consists of light concrete and is delivered with the

system. The low voltage cables are connected through

box terminals (35 mm² to 300 mm²). The PEN conduc-

tor is connected via cable lug and rivet nut to the PEN

bus.

Installation & connection schematic LVRSys™ to 110 kV

Installation & connection schematic LVRSys™ to 175kVA

Installation & connection schematic LVRSys™ to 400kVA

We take care of it.

6. Operation

Regulation parameters

0 Reference value (voltage value, 3- phase)

0 Tolerance band + (upper limit value of the tolerance

area)

0 Tolerance band - (lower limit value of the tolerance

area)

0 Time ratio (selection of time characteristics)

0 Delay (delay of characteristics)

0 Synchronous phasing (phases are stepped synchro-

nously)

0 Grid impedance (current values are included in

regulation)

Tolerance area

Drag indicator function The "drag pointer" displays the 15-minutes average

values for the following measurement parameters:

0 Maximum voltage values Ph1-Ph3

0 Maximum current values Ph1-Ph3

0 Maximum output values Ph1-Ph3

0 Minimum/maximum temperatures

T1 output level aluminium plate

T2 control housing

T3 switch cabinet air

Drag indicator function

Temperature display

Temperature display

Update & CSV file output The measurement data (CSV) and the log book can be

retrieved with the help of an USB stick. One can also

update the firmware with the help of an USB stick.

CSV- file output

Grid impedance The regulator measures the output voltage and phases

it in case of over-/under-voltage in the tolerance bands.

When an additional parametrising of the "grid imped-

ance" takes place, a new voltage regulation value is

created. By measuring the grid current and the para-

metrised grid impedance one can calculate the voltage

value in "grid branch" exactly. The regulation can be

therefore optimised without communication devices.

Parametrising grid impedance

7. LVRSys™ product family

7.1 Standard

Scope of delivery:

0 Concrete base (Outdoor- application)

0 Steel base (Indoor- application)

0 By-pass switch with output-specific characteristics

System Dimensions/Model

55 kVA NH 000 separator



250 kVA NH 2 switch-disconnector

fuse

400 kVA NH 3 switch-disconnector

fuse

0 2 x 3- phase voltage taps for external measurement

devices

0 Regulator with voltage measurement on the output

side

7.2 Individually

0 By-pass switch according to customer specifications

(NH- size)

0 Current measurement output side

0 Current measurement input side

0 Voltage measurement input side

0 Additional outflows/inflows (bus system)

0 Integrated Power Quality Analysis (PQI-DA smart)

input side

0 Integrated Power Quality Analysis (PQI-DA smart)

output side

LVRSys™ 55 kVA 6 % / 10 % – 110 kVA 6 %

LVRSys™ 110 kVA 10 % - 175 kVA 6 % / 10 %

LVRSys™ 250 kVA 6 % / 10 % - 400 kVA 6%

PQI-DA smart

We take care of it.

A. Eberle GmbH & Co. KG

Frankenstraße 160

D-90461 Nuremberg

Tel.: +49 (0) 911 / 62 81 08 0

Fax: +49 (0) 911 / 62 81 08 99

Email: [email protected]

http://www.a-eberle.de

Edition of: 19/11/2014

Copyright 2014 A. Eberle GmbH & Co. KG

Subject to change without prior notice.

Low voltage regulation system - A. Eberle€¦ · · 2016-06-22The low voltage regulation system...

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