WKE60 LITTELFUSE | Alldatasheet
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Technical content
The GFR 4000 ground fault relay is specifically designed to provide complete motor protection without the problems associated with high sensitivity nuisance tripping. The GFR 4000 is unique because it has predictive as well as protective capabilities. The unit operates continuously in one of two modes, either on-line or off-line. The GFR4000 has metering output signals for use with a remote meter or PLC so that ground faults may be detected at an early stage. The GFR 4000 operates on grounded, high resistance grounded and ungrounded systems. The unit can be directly connected to supplies up to 1300V, 1PH or 3 PH, 50-60 HZ. For supplies from
1300 V to 5000 V, the GFR 4000 must be connected
to the HTC 5000 high tension coupling unit. Operation On-Line Mode Under normal running conditions the GFR 4000 operates as a sensitive ground fault relay working in conjunction with a separately connected core palance current transformer. The alarm range is adjustable with a 10 position range of fixed operating points between 10 mA and 3A. Time delay is adjustable between 0 and 1 seconds. When the preset response value is exceeded, the GFR4000 operates the output relay after the preset time delay. There is instant LED indication. The unit can be set for Active or Failsafe mode and has memory and auto reset facilities. The GFR 4000 also monitors the loop connection to the current transformer and provides LED indication should it detect a C.T. fault. The metering output signal is proportional to the actual leakage current and is expressed as a percentage of the GFR 4000 leakage current setting. The output is 0 – 1mA FSD with the meter reading scaled 0 to 100% relating directly to the selected current trip value. Features/Benefits Adjustable sensitivity from 10 mA t to 3.0 A to reduce nuisance trips. Precise insulation resistance readings indicate problems in advance Adjustable time delay adapts to unique applications. Fail-safe operation On Line monitoring of ground to detect any change in leakage current Off line monitoring of insulation resistance to notify or halt unacceptable levels C.T. Loop Monitoring Test/Reset buttons to assure operation NO/NC form “C” output alarm relay contacts GFR4000 Continuous On and Off-Line Monitor Off-Line Mode The GFR4000 automatically changes state by means of a small auxiliary contact on the main contactor when the motor (or load) is switched off. The unit becomes a high performance insulation resistance monitor. It imposes a small DC current onto the network which travels through the motor windings and interconnecting cable from the motor starter. A green LED indicates that the off-line monitoring function is active. The insulation resistance function of the GFR has an adjustable alarm range from 250 kΩ – 2 MΩ. The red LED indicates “low resistance” and operates instantly when the trip relay is activated. The off-line feature also has an Active/Failsafe Mode and Memory/Auto Reset facilities. The metering output is 0- 1mA FSD and relates to an insulation range of 0 to infinity. WKE Series Current Transformer The WKE series C.T.s are specifically designed to operate with POWR-GARD relays. These C.T.s are protected from open circuit burnout and will saturate at low voltages to prevent damage to the C.T. There are varying diameters of C.T. s ranging from 1” to 8 ¼ “. The C.T. is connected across terminals 16 and 17. It is essential when installing C.T.s that only the load cable conductors L and N (1 PH) or L1, L2, and L3 with N (3 ph or 3 or 4 wire), are passed through the center of the C.T. The ground wire must remain outside the C.T. core. Littelfuse, Inc. POWR-GARD Products 800 E. Northwest Highway, Des Plaines, IL 60016 1-800-TEC-FUSE | www.littelfuse.com
Nominal AC Insulation Voltage 660 V AC Insulation Ground to UL 1053 IEC1010 and VDE 0110 Class C Test Voltage 1000 V AC Operation Class Continuous Supply voltage Vs 24/115 V ac 50-60 Hz Power Input 5 V A Alarm Relay Contacts 2 volt-free NO/NC Switching capacity 1200VA Rated Contact voltage 250V Continuous Current 5 A Breaking Capacity @240V AC P.F. = 0.4 3 A @ 110VDC, @L/R = 0 0.3 A Relay Function Selection by linked terminals Adjustable Function Failsafe/Active Relay Alarm Memory Hand/Auto Reset Factory Settings Failsafe/Hand Operating Ambient Temp. -10 to +60 deg. C Storage Ambient Temp. -40 to +80 dec. C Mounting Terminal Screws M2.5 Terminal Capacity 0.5 to 2.5 mm ⒉ Weight 12 oz Enclosure 3 15/16”W x 2 15/16 H x4 3/8” D On-Line Current Relay 10/30/60/80/100/ Response Range 300/800mA, 1/3 A 4 step time delay 0 /.25/.5 / 1 sec. Metering driver 0 – 1mA FSD 1 volt-free NO/NC contact Off-Line Monitor Max Voltage for : Direct Connection 1300V With HTC 5000 5000V Measuring Voltage 12 V DC Measuring Current 20 uA DC Internal Resistance 600 K Ω AC impedance at 50-60 Hz >1M Ω Response adjustment pot 250k Ω – 2MΩ Response delay <250mSec Max leakage capacitance to < 1 uF ground Max . Stray DC voltage 1000V DC permissible K.Ω Meter Driver 0 – 1mA FSD Alarm Relay Contacts 1 volt-free NO/NC C o n t a c t Current Transformer C . T . T y p e W K E Burden in GFR4000 ac impedance, 50-60 Hz 150 Ω- 1 KΩ Supply Voltage and Test The GFR4000 will operate on supply voltages of 115 V ac or 24V ac, 50-60 Hz(+/- 15%). The green “ON” LED indicates power present. The Test button will test both leakage current and insulation resistance regardless of operation mode. Depress test button for at least 5 secs. to complete test. All LEDs will operate and relay contacts will change to fault/alarm position. If the relay is set to memorize faults, these will remain. Allow 5 seconds before operating the Reset pushbutton. External test/reset facilities via S6/S7 as shown in the Connection Diagram. Warning! Before carrying out Megger test or voltage pressure test on the system, be sure to disconnect the GFR4000. It is essential that the connection to ground from terminal 30 is securely connected. When commissioning the installation, always check the relay performance by using a real fault to ground (a 10kΩ resistor rated at 20 watts in a 3ph 660V network will produce approximately 40mA of leakage current and indicate a 10kΩ fault). Littelfuse, Inc. POWR-GARD Products 800 E. Northwest Highway, Des Plaines, IL 60016 1-800-TEC-FUSE | www.littelfuse.com
H1 LED green power “ON” H2 LED red leakage current “GROUND FAULT” H3 LED red open C.T. Circuit “FAULT” H4 LED green insulation resistance monitor “ACTIVE” H5 LED red low insulation “FAULT” S1 Test button for general test S3 Leakage current response selector switch S4 Leakage current response time delay S5 Pushbutton “RESET” S6 External test button (not included) S7 External reset button (not included) R1 Insulation resistance response potentiometer K1 Insulation resistance alarm relay K2 Leakage current alarm relay I External meter for leakage current (not included) R External meter for insulation resistance (not included) C.T. Current transformer WKE HTC High Tension coupler for connections above 1300V ac Terminals
2 Coupling for insulation resistance monitoring mode
5 – 6 115 V ac power supply (+/- 15%) 5 – 7 24 V ac power supply (+/- 15%) 10-11-12 Contact relay K1 13-14-15 Contact relay K2 16 – 17 C.T. connection 18 – 19 Link for auto reset K2 19 – 20 Link for active mode K2 21 – 22 Link for auto reset K1 22 – 23 Link for active mode K1 24 – 25 Leakage current meter 25 – 26 Insulation resistance meter 27 – 28 Link for active mode for insulation resistance monitor
29 Coupling for HTC 5000/8000
30 Measuring ground
** All external switches are shown as optional NOTE: Electronic terminals (16 – 30) are potential free. Terminal 30 and Terminal E must be connected to ground! Littelfuse, Inc. POWR-GARD Products 800 E. Northwest Highway, Des Plaines, IL 60016 1-800-TEC-FUSE | www.littelfuse.com
Littelfuse, Inc. POWR-GARD Products 800 E. Northwest Highway, Des Plaines, IL 60016 1-800-TEC-FUSE | www.littelfuse.com WKE Series Current Transformers The WKE Series of current transformers is a key component of the POWR-GARD ground fault detection product line. These CTs are highly accurate. They convert very small differential currents to an ac voltage and output this signal to the connected POWR-GARD ground fault relay. The WKE Series CTs are made from high-density mu metal which has unique and repeatable output characteristics.
Features
The WKE CTs have built-in safety features far surpassing those of CTs with a ferrite core. The WKE CT is resistant to open circuit burn out and will saturate at safe, low-level voltages. The CTs are housed with an insulating protection. They have built in brackets to facilitate mounting. Terminal cover may be wire sealed for further protection Primary Current 2500A Secondary Current 350mA NSV 600Vac BIL Rating 2000V Rated Frequency 10 – 1000Hz Thermal current rating 70 ˚ C No Fixed Burden Accuracy 99% Flux Shielding Installation Instructions When installing the WKE CTs, ensure the following: 1. Only the load carrying conductors pass through the center of the CT. (This means L1 + N for 1 phase and L1+ L2 + L3 for 3 phases.) 2. The power conductors pass through the center of the CT and are preferably bound together to keep the conductors uniformly spaced. 3. The power conductors pass PERPENDICULAR to the CT and, whenever practical, continue perpendicular to the CT on both sides of the CT for 3”. 4. The power conductors should not be installed in a way that allows them to run along the side edges of the CT. 5. Whenever practical, locate the CT away from noise-generating devices such as transformers, frequency converters, etc. Dimensions (in) a b c d e WKE 25 1 3 3.9 1.63 3.63 WKE130 5.12 7.25 8.5 4 7.0