Ground Fault Relay DGF7-30
price:€
In stock:
If your needs exceed our stock, please contact us. Due to our excellent component stock-levels, we are able to accomodate most requests.
This unit has been known as the D64RPB30 brand labelled for Eaton Corp. As of April 2023 we decided to sell this unit on this website as the DGF7-30 as part of the DGF7 family.
The DGF7-30 is a microprocessor based ground fault unit for use on solidly grounded or resistance grounded systems. This innovative digital
electronic unit measures ground fault current using an external CS. Go to Sensors.
External CS’s with different cable windows, round or square and split core,
and various current ratios are available. The DGF7-30 detects a connection failure, open or shorted wires, of an external CS. Both situations will
call for a trip of the system, as it is unprotected from there on.This function is only available in the C1 series, not in the D1 series.
The system will react to alternating current (AC) only and will reject direct current (DC) signals. Accuracy will be maintained over a frequency range of 45 - 450 Hz, making it suitable for variable frequency drive applications. The DGF7-30 is a Class A device as defined in the IEC 60755 standard; it is therefore fully characterized for operation with sinusoidal AC and pulsating DC currents.
The unit can be used on any system voltage by using any GFS external CS and insulating the busbars above 660 V.
The DGF7-30 houses a non-isolated universal power supply from 24 - 240 V AC or DC and is equipped with form ‘Z’ (4-wire) isolated N.O. and N.C. contacts. The Ground Fault Current Trip level (30 mA – 9 A, 8 steps), Trip Delay Time (20 ms – 10 s, 6 steps), Trip Inhibit (enabled/disabled) and the Relay Operating Mode (Continuous Non-Failsafe, Continuous Failsafe, Pulsed Non-Failsafe, Pulsed Failsafe) are set on a front accessible dipswitch array. The dipswitch array is made ‘tamper proof’, meaning that manipulating the switches will not change the settings, unless a special procedure is followed. If the procedure is not followed correctly the red and green LEDs will flash alternately, indicating an attempt to illegally change the settings. The original settings will stay valid until the entire procedure is followed.
This unit has been known as the D64RPb30 brand labelled for Eaton Corp. As of april 2023 we decided to sell this unit on this website as the DGF7-30 as part of the DGF7 family.
The DGF7-30 is a microprocessor based ground fault unit for use on solidly grounded or resistance grounded systems.
This innovative digital electronic unit measures ground fault current using an external CS. Go to Sensors.
External CS’s with different cable windows, round or square and split core, and various current ratios are available. The DGF7-30 detects a connection failure, open or shorted wires, of an external CS. Both situations will call for a trip of the system, as it is unprotected from there on.This function is only available in the C1 series, not in the D1 series.
The system will react to alternating current (AC) only and will reject direct current (DC) signals. Accuracy will be maintained over a frequency range of 45 - 450 Hz, making it suitable for variable frequency drive applications. The DGF7-30 is a Class A device as defined in the IEC 60755 standard; it is therefore fully characterized for operation with sinusoidal AC and pulsating DC currents.
The unit can be used on any system voltage by using any GFS external CS and insulating the busbars above 660 V.
The DGF7-30 houses a non-isolated universal power supply from 24 - 240 V AC or DC and is equipped with form ‘Z’ (4-wire) isolated N.O and N.C. contacts. The Ground Fault Current Trip level (30 mA – 9 A, 8 steps), Trip Delay Time (20 ms – 10 s, 6 steps), Trip Inhibit (enabled/disabled) and the Relay Operating Mode (Continuous Non-Failsafe, Continuous Failsafe, Pulsed Non-Failsafe, Pulsed Failsafe) are set on a front accessible dipswitch array. The dipswitch array is made ‘tamper proof’, meaning that manipulating the switches will not change the settings, unless a special procedure is followed. If the procedure is not followed correctly the red and green LEDs will flash alternately, indicating an attempt to illegally change the settings. The original settings will stay valid until the entire procedure is followed.
The measured current is compared against two setpoints. The lower one is the Ground Fault (G/F) setpoint, the higher one is the High Current (H/C) setpoint. Using different ratio Current Sensors will influence the setpoint, as outlined in table 2.
When the current exceeds the G/F setpoint during the set delay, but does not reach the H/C level, a ‘G/F’ is diagnosed and the unit trips by operating its internal relay. Should a fault be approaching a dead short to ground, causing a residual current exceeding the H/C setpoint, then without any intentional delay the unit operates its relay, indicating a Short Circuit (S/C).
The user can select the operation of the relay to be ‘Trip Inhibited’. Together with an upstream tripping device (fuses or breaker) it can protect local contactor contacts in the case of H/C faults. In this case the unit does not trip initially when the measured current exceeds the H/C setpoint, but waits for the upstream device to take care of current interruption and then trips. The latter trip flags the location of the fault to the user and also allows, after inspection on welded contacts, fast re-closure of the upstream tripping device. Should the upstream device fail to perform, then automatic backup protection makes the DGF7-30 trip, as a last resort, one second after the H/C occurred. This makes it possible to design a Type 2 coordinated installation, according to the IEC 60755 standard.
A single press of the ‘RESET’ button resets the unit after a trip. A functional test of the DGF7-30 is started by double clicking the cover mounted pushbutton. WARNING: invoking a test will and must trip the installation! A green ‘RUN’ LED flashes, alternating one second on and off, to indicate that sufficient Control Voltage is applied (Power OK). A red ‘TRIP’ LED indicates that the DGF7-30 has sensed a fault and that the output contacts have operated. The blinking sequence of the red LED indicates the type of fault. After removing the Control Voltage, the stored trip condition in memory can be shown by pressing the button, green LED if no trip was registered and red LED indicating the opposite. The same blinking sequence is seen here.
An 8 point Pull-apart terminal block simplifies connection of field wiring.
To ensure that the DGF7-30 will function in severe circumstances, it is encapsulated in polyurethane (PUR) to make sure it is not vulnerable to mechanical shock, vibration nor weather.
The measured current is compared against two setpoints. The lower one is the Ground Fault (G/F) setpoint, the higher one is the High Current (H/C) setpoint. Using different ratio Current Sensors will influence the setpoint, as outlined in table 2.
When the current exceeds the G/F setpoint during the set delay, but does not reach the H/C level, a ‘G/F’ is diagnosed and the unit trips by operating its internal relay. Should a fault be approaching a dead short to ground, causing a residual current exceeding the H/C setpoint, then without any intentional delay the unit operates its relay, indicating a Short Circuit (S/C).
The user can select the operation of the relay to be ‘Trip Inhibited’. Together with an upstream tripping device (fuses or breaker) it can protect local contactor contacts in the case of H/C faults. In this case the unit does not trip initially when the measured current exceeds the H/C setpoint, but waits for the upstream device to take care of current interruption and then trips. The latter trip flags the location of the fault to the user and also allows, after inspection on welded contacts, fast re-closure of the upstream tripping device. Should the upstream device fail to perform, then automatic backup protection makes the DGF7-30 trip, as a last resort, one second after the H/C occurred. This makes it possible to design a Type 2 coordinated installation, according to the IEC 60755 standard.
A single press of the ‘RESET’ button resets the unit after a trip. A functional test of the DGF7-30 is started by double clicking the cover mounted pushbutton. WARNING: invoking a test will and must trip the installation! A green ‘RUN’ LED flashes, alternating one second on and off, to indicate that sufficient Control Voltage is applied (Power OK). A red ‘TRIP’ LED indicates that the DGF7-30 has sensed a fault and that the output contacts have operated. The blinking sequence of the red LED indicates the type of fault. After removing the Control Voltage, the stored trip condition in memory can be shown by pressing the button, green LED if no trip was registered and red LED indicating the opposite. The same blinking sequence is seen here.
An 8 point Pull-apart terminal block simplifies connection of field wiring.
To ensure that the DGF7-30 will function in severe circumstances, it is encapsulated in polyurethane (PUR) to make sure it is not vulnerable to mechanical shock, vibration nor weather.
