Marsh Electronics, Inc. - Item # item-2590, ESTAsym® 3D - Unbalance Protection Relay
 
 
 
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All Categories > Aluminum Capacitors > Screw Terminals Aluminum Capacitors, Power High Ripple Current > ESTAsym® 3D - Unbalance Protection Relay > Item # item-2590  
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Item # item-2590 ESTAsym® 3D - Unbalance Protection Relay
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Unbalance Protection Relay

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Application
The ESTAsym® 3D is designed to monitor large-capacitor equipment in a one or three double-star circuit or bridge circuit.

Double Star
The star connection is divided into two star points. The star points are connected via a current transformer. Normally this current feature has very small values. In the event of a failure, i.e., element breakdown or group short-circuit, the star point of the respective branch is shifted and causes a current flow between the star points. The intensity of the current is determined by the capacitor construction and the number of capacitors.

ESTAsym 3D has three measurement inputs, where pick-up values can be set separately from each other. Thus, there is the possibility of controlling up to three filter circuits with one ESTAsym 3D with a double star structure. The filter circuits can feature different tuning frequencies and outputs.

The capacitor bank forms four bridge branches, with two branches each constituting a series connection. The medium potentials of the branches are connected by a current transformer. The division of the bridge branches preferably should be symmetrical. An unsymmetrical structure would also be possible. However, with an unsymmetrical structure, the pick-up values must be set to the more sensitive branch.

Here too, it is possible to control up to three filter circuits with one ESTAsym 3D with a bridge connection structure. The filter circuits can have different tuning frequencies and outputs



Measuring Circuits · Setting Ranges · Output Circuit · Display · Specifications · Supply · Mechanical Specifications · Features and Applications

Measuring Circuits

Possible Current Transformer Types

X/1 or X/5; without any conversions on the unit

Measuring Range

0 to 5.0 A

Galvanic Separation

Via current voltage transformer, dielectric strength of 2 kV

Power Consumption per Measuring Circuit

1 V·A

Measurement Input Filler

The measurement signal is passed via a 50-Hz or 60-Hz band pass filter

Measuring Accuracy

Class 1

Overload Capacity

2500 A at t = 0.1 ms

Setting Ranges

Setting Range Alarm

0 A to 5.0 A; separately for each measurement channel

Setting Range Switch-Off

0 A to 5.0 A; separately for each measurement channel

Setting Range Time Delay Alarm

0.1 seconds to 5.0 seconds

Setting Range Time Delay Switch-Off

0.1 seconds to 5.0 seconds

Output Circuit

Signal Outputs

Contact rating 8 A/265 VAC or 0.3 A/300 VDC or 8 A/30 VDC
Potential-free change-over switch contacts for alarm and switch-off
The contacts do not have any protective circuits
The normal position of the relay can be selected picked up or released

Resetting of the Tripping

Automatic, when decreasing below the pick-up value or manual via key operation

Display

Measurement and Rated Value Display

LED seven-segment display, four-digit, red. fond size - 10 mm

Unit

The allocation to the unit (sec) or (A) is effected via two LEDs

Menu Display

The display to the selected menu is effected via six LEDs

Fault Display

An active alarm or switch-off s indicated by blinking LEDs

Measurement Channel

The measurement channel selected for the display is indicated by LEDs.

Specifications

Interface

PC software and interface record at request
RS232 and RS485

Supply

Operating Voltage, Two Models

110 VAC to 230 VAC, 50/60 Hz and 110 VDC to 350 VDC or 18 VDC to 72 VDC

Power Consumption

Ca. 10 V·A

Mechanical Specifications

Front Plate

144 x 144 mm

Switchboard Cutout

138 x 138 mm

Installation Depth

Ca. 70 mm

Max. Weight

0.65 kg

Model

Pursuant to EN 50178, Class II protection and EN 61010-1, EN50081-1, EN50082-2

International Protection

IP 40 with mounted plug connector (If requested, IP 55 Iron the front In the assembled state via lockable full-view window)

Operating and Environment Temperatures

-25 to +60 ºC

Installation Position

Optional

Features and Applications
    Hardware
    • Three galvanic measurement channels that are independent of each other.
    • Current measuring range up to 5A - transformers X/1A and X/5A can be connected directly without requiring any conversion.
    • Via the measurement signal, only the fundamental wave is evaluated - no influence of harmonic waves.
    • Potential-free signal contacts; change-over contacts without any protective circuits.
    • Fitted with interfaces RS232 and RS485 as a standard.
    • Real-time function for storing the alarm messages.
    • Compact structure in a plastic casing.
    • Voltage supply via a wide-range supply unit, all common supply voltages are available.

    Software
    • For each measurement channel, separate alarm and switch-off values can be set.
    • Time delays for alarm and switch-off can be set separately.
    • The basic setting of the signal relay (picked up or released) can be configured.
    • The following two ways of cancelling the alarm are possible:
        - Manual RESET : The alarm continues to be active even after the measurement signal has fallen below the set trip value (e.g., upon switching off the capacitor equipment). The alarm can be cancelled by pressing the two keys simultaneously.
        - Automatic RESET : The alarm will be cancelled when the measurement signal falls below the set trip value. No manual reset is necessary.
    • Storing the unbalance current when tripping the switch-off. The value can be read off at the unit (only activated if resetting is carried out manually).
    • Storing the unbalance current with date and time when tripping the switch-off. Up to 20 messages can be stored; query via PC software.
    • All parameters: setting values can be configured via the interface.

 MORE IMAGES 

· Double Star Connection

· Bridge Circuit

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