Medium Voltage – Automatica SA

Medium voltage switchgear with automated circuit breaker

daniel ordean — Fri, 31 Aug 2018 11:19:59 +0000

Automatica has designed and certified a new type of medium voltage cell. This new type of cell can withstand currents of 50kA short circuit and can be integrated into a SCADA system because of the automated CLP and circuit breaker rail.

Medium voltage reactive power control

daniel ordean — Fri, 31 Aug 2018 11:19:27 +0000

Industrial consumers, in general, pay monthly for a quantity of reactive energy representing the difference between the measured reactive energy and the calculated reactive energy, corresponding to the neutral power factor (0,92).

In order to eliminate these expenses, the improvement of the power factor is done through the injection of capacitive reactive energy in the consumer’s distribution network.
Control systems are used with ecological capacitor banks of fixed value or sequential, installed at the level of 6, 10 or 20 kV, indoor or outdoor.

Each power factor correction switchgear is equipped with exhaust hatches in case of internal incidents (arc fault, capacitors’ defects).

Technical data	Measurement unit	Nominal values
Rated voltage	kV	6,3
Frequency	Hz	50
Withstand voltage 1 min. at 50 Hz	kV	28
Power allowance	–	-5%….+10%
Discharge time up to 75 V	S	600 max
Losses	w/kVar	0,3
Operating temperature	–	-10^oC….+40^oC
Standards	–	IEC 60871-1 EN 60871-1

The capacitor banks in each switchgear are powered through a three-pole disconnector, with fuses and circuit breaker, when you require a manual actuation, or through a fuse contactor when you require an automated (sequenced) actuation, each sequence having circuit breaker.

Medium voltage enclosure

daniel ordean — Fri, 31 Aug 2018 11:17:42 +0000

Within the medium voltage enclosure voltage measurement transformers can be installed on a withdrawable truck.
The medium voltage enclosure for switchgears modernizations is designed for the replacement of the existing circuit breakers in the medium voltage switchgear, thus insuring the simple and safe extraction of the modern vacuum or SF6 circuit breaker.
All the mechanisms of the medium voltage enclosure are designed and manufactured to offer maximum user safety and convenience of use.
The medium voltage enclosure can be fitted with a whole range of circuit breakers within the medium voltage switchgears:
- capacitor bank;
- transformer;
- radial line;
- interconnected line;
- motor;
- couple;
- input.

Technical data	UM	Value
Technical data	UM	7.2kV	12kV	24kV
1.	2.	3.	4.	5.
Rated voltage	kV	7,2	12	24
Operational voltage	kV	6	10	20
Testing voltage 50Hz 1 min	kVef	20	28	50
Lighting impulse testing voltage	kVmax	40	75	125
Rated frequency	Hz	50/60
Rated current	A	630 – 2500
Short time withstand current, 1s	kA	16 – 50	16 – 50	16 – 31,5
Peak withstand current Ipk (Ka)	kA	40 – 125	40 – 125	40 – 80
Protection degree (CEI 60529)	–	IP 31
Surfaces treatment	–	zinc plated/powder coating

Medium voltage switchgears 7,2 kV, 12 kV, 24kV

daniel ordean — Fri, 31 Aug 2018 11:17:07 +0000

The medium voltage switchgear is designed for the primary distribution of the medium voltage electrical energy in power substations, industrial substations, secondary distribution substations.

Type CI/CE indoor/outdoor electrical switchgears are designed for rated voltage of 7,2; 12; 24 kV and rated current up to 4000 A.

Applications:

Thermal-electrical plants,
Hydro-electrical plants,
Nuclear-electrical plants,
Mining industry,
Naval industry,
Oil industry,
Chemical industry,
Subscriber transformer posts,
Airports,
Transformer stations and substations.

The indoor medium voltage switchgear is made of metallic elements assembled to form compartments with simple/double busbar system, aer insulated. It can be manufactured withdrawable version (with truck) or fixed version (without truck). It can be equipped with vacuum circuit breakers (SIEMENS, ALSTOM, SCHNEIDER, EATON, ABB, TAVRIDA, or others) or SF6 (ABB, ALSTOM, SCHNEIDER, or others) or air or SF6 disconnectors (SIEMENS, ALSTOM, EATON, ABB) .

Versions:

Indoor or outdoor,
Transformer outgoing panel,
Coupler panel with circuit breaker,
Coupler panel without circuit breaker (dummy truck),
Outgoing feeder panel,
Motor panel,
Capacitor bank panel,
Voltage measurement panel,
With/without surge arresters,
Auxiliary transformer panel.

The switchgears are built so that all operations and maintenance operations including regular checks of the phases’ succession, earthing connections, cable’s fault detection and dielectric tests can be done in safe conditions.

Thanks to a high degree of automation the switchgears can be integrated in a remote control SCADA monitoring system.

The switchgear can be equipped with devices from our traditional suppliers SIEMENS, ALSTOM, SCHNEIDER, EATON, A

BB, TAVRIDA or devices from other producers according to our customers’ requirements.