Ground Fault Relay DGF7-61
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The DGF7-61-JM.
No dipswitches. Fixed settings of 30mA, 20ms, Continuous Non-Failsafe operation.
The DGF7-61-JM1.
No dipswitches. Fixed settings of 30mA, 20ms, Continuous Failsafe operation.
This unit has been known as the JCB61-1 brand labelled for Eaton Corp South Africa. As of November 2023 we decided to sell this unit on this website as the DGF7-61.
The DGF7-61 is a microprocessor based ground fault relay for use on solidly grounded or resistance grounded systems. This innovative digital electronic relay measures ground fault current using a built-in 28 mm zero sequence Current Sensor , or an external Current Sensor. Go to Sensors. External Current Sensors with different cable windows, round or square, and various current ratios are available. Once an external Current Sensor is detected, this is logged in memory and is used to detect a short in the Current Sensor wires or an open connection. Both situations will call for a trip of the system, as it is unprotected from there on. All Current Sensors 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 DGF7-61 is a Class A device as defined in the IEC 60755 standard; it is therefore fully characterised for operation with sinusoidal AC and pulsating DC currents. By using the internal Current Sensors of the DGF7-61 the maximum system voltage is 660 V. By insulating the busbars any GFS supplied external Current Sensors can be used on any system voltage, or using a 5 A interposing Current Transformer with the correct voltage rating will isolate the DGF7-61 from the system power lines.
The DGF7-61 houses a non-isolated universal power supply that ranges from 24 - 240 V AC or DC. The internal relay is equipped with form 'Z' (4-wire) isolated N.C. and N.O. contacts. The following four functions are some of the available features, to be set on a front accessible dipswitch array:
The Trip Levels for ground fault current (ranging from 30m A - 3 A in 8 steps).
The Trip Delays in 5 settable levels between 20 ms and 3 s.
The Trip Inhibit. (enabled/disabled)
The Relay Operating Modes are: Continuous Non-Fail Safe, Continuous Fail Safe, Pulsed Non-Fail Safe and Pulsed Fail Safe.
For all features, see the manual.
This unit has been known as the JCB61-1 brand labelled for Eaton Corp South Africa. As of November 2023 we decided to sell this unit on this website as the DGF7-61.
The DGF7-61 is a microprocessor based ground fault relay for use on solidly grounded or resistance grounded systems. This innovative digital electronic relay measures ground fault current using a built-in 28 mm zero sequence Current Sensor , or an external Current Sensor. Go to Sensors.
...External Current Sensors with different cable windows, round or square, and various current ratios are available. Once an external Current Sensor is detected, this is logged in memory and is used to detect a short in the Current Sensor wires or an open connection. Both situations will call for a trip of the system, as it is unprotected from there on. All Current Sensors 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 DGF7-61 is a Class A device as defined in the IEC 60755 standard; it is therefore fully characterised for operation with sinusoidal AC and pulsating DC currents. By using the internal Current Sensors of the DGF7-61 the maximum system voltage is 660 V. By insulating the busbars any GFS supplied external Current Sensors can be used on any system voltage, or using a 5 A interposing Current Transformer with the correct voltage rating will isolate the DGF7-61 from the system power lines.
This unit has been known as the JCB61-1 brand labelled for Eaton Corp South Africa. As of April 2023 we decided to sell this unit on this website as the DGF7-61 as part of the DGF7 family.
The DGF7-61 houses a non-isolated universal power supply that ranges from 24 - 240 V AC or DC. The internal relay is equipped with form 'Z' (4-wire) isolated N.C. and N.O. contacts. The following four functions are some of the available features, to be set on a front accessible dipswitch array:
The Trip Levels for ground fault current (ranging from 30m A - 3 A in 8 steps).
The Trip Delays in 5 settable levels between 20 ms and 3 s.
The Trip Inhibit. (enabled/disabled)
The Relay Operating Modes are: Continuous Non-Fail Safe, Continuous Fail Safe, Pulsed Non-Fail Safe and Pulsed Fail Safe.
For all features, see the manual.
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 setpoint, the higher one is the High Current setpoint. Using different ratio Current Sensors or interposing Current Transformers will influence the setpoints. For more information see the manual. When the current exceeds the Ground fault setpoint for the set delay, but does not reach the High Current level, a 'Ground Fault' 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 High Current setpoint, then without any intentional delay the unit operates its relay, indicating a Short Circuit.
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 High Current faults. In this case the unit does not trip initially when the measured current exceeds the High Current 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 DGF7-61 trip -as a last resort- one second after the High Current 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, or an external, voltage free, momentary pushbutton resets the relay after a trip. By double clicking the cover mounted RESET button a functional test of the DGF7-61 is invoked.
The unit shows it has sufficient Control Voltage applied by flashing the green RUN LED (1s on, 1s off). The red TRIP LED shows that the DGF7-61 has sensed a fault and that it has operated it's output contacts. The blinking sequence of the red LED indicates the type of fault.
A communications port provides access for a remote display. The remote DGF7 Display shows the actual ground fault current during normal running of the systems. After a trip the ground fault current just prior to the trip is displayed. If the DGF7 Display was connected to the DGF7-61 at the moment of a trip and the DGF7-61’s Control Voltage is turned off, pressing the ‘VERIFY’ button will show the cause of the trip. For all features, go to DGF7 Display.
The DGF7-61 is encapsulated in polyurethane (PUR) to ensure that it will function in all circumstances. This will make sure it is not vulnerable to weather, vibration or mechanical shock.
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 setpoint, the higher one is the High Current setpoint. Using different ratio Current Sensors or interposing Current Transformers will influence the setpoints. For more information see the manual. When the current exceeds the Ground fault setpoint for the set delay, but does not reach the High Current level, a 'Ground Fault' 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 High Current setpoint, then without any intentional delay the unit operates its relay, indicating a Short Circuit.
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 High Current faults. In this case the unit does not trip initially when the measured current exceeds the High Current 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 DGF7-61 trip -as a last resort- one second after the High Current 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, or an external, voltage free, momentary pushbutton resets the relay after a trip. By double clicking the cover mounted RESET button a functional test of the DGF7-61 is invoked.
The unit shows it has sufficient Control Voltage applied by flashing the green RUN LED (1s on, 1s off). The red TRIP LED shows that the DGF7-61 has sensed a fault and that it has operated it's output contacts. The blinking sequence of the red LED indicates the type of fault.
A communications port provides access for a remote display. The remote DGF7 Display shows the actual ground fault current during normal running of the systems. After a trip the ground fault current just prior to the trip is displayed. If the DGF7 Display was connected to the DGF7-61 at the moment of a trip and the DGF7-61’s Control Voltage is turned off, pressing the ‘VERIFY’ button will show the cause of the trip. For all features, go to DGF7 Display.
The DGF7-61 is encapsulated in polyurethane (PUR) to ensure that it will function in all circumstances. This will make sure it is not vulnerable to weather, vibration or mechanical shock.
