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Products detail
Inquiry Photo Description Model Technical parameters Certification Remark
NV11B Multifunction Voltage Relay NV11B
 Protection functions
Undervoltage (27)
27.1 - Unipolar undervoltage (27.1)
27.2 - Unipolar undervoltage (27.2)
27.3 - Unipolar undervoltage (27.3)
27.4 - Unipolar undervoltage (27.4)
Overvoltage (59)
59.1 - Unipolar overvoltage (59.1)
59.2 - Unipolar overvoltage (59.2)
59.1 - Unipolar overvoltage (59.3)
Residual overvoltage (59N)
Breaker failure (BF)		 Other models also available, please contact us for details.
NV10P Multifunction Voltage And Frequency (Pro) NV10P
 Protection functions
Pt100 thermometric probes (26)
Undervoltage (27)
Overvoltage (59)
Residual overvoltage (59N)
Frequency rate of change (81R)
Underfrequency & overfrequency (81U 81O)
Breaker failure (BF)		 Other models also available, please contact us for details.
NV10B Multifunction Voltage And Frequency (Base) NV10B
 Protection functions
Pt100 thermometric probes (26)
Undervoltage (27)
Overvoltage (59)
Residual overvoltage (59N)
Breaker failure (BF)		 Other models also available, please contact us for details.
NTGP Multifunction Protection For Large Size Generators NTGP
 Protection functions
Underimpedance (21)
Overflux (V/Hz) (24)
Pt100 thermometric probes (26)
Undervoltage (27)
Third harmonic undervoltage (27H)
Directional active overpower (32P)
Reverse active overpower (32R)
Active underpower (37P)
Loss of field (40)
Negative sequence overcurrent (46)
Thermal image (49)
Inadvertent energizing (50+27)
Phase overcurrent (50/51)
Residual overcurrent (50N/51N)
Voltage-controlled overcurrent (51V)
Overvoltage (59)
Third harmonic overvoltage (59H)
Residual overvoltage (59N)
Rotor earth fault (64F)
Low impedance restricted ground fault (64REF)
Underfrequency & overfrequency (81U 81O)
High impedance restricted earth fault (87NHIZ)
Breaker failure (BF)		 Other models also available, please contact us for details.
NTGB Multifunction Protection For Small And Medium Size Generators NTGB
 Protection functions
Underimpedance (21)
Pt100 thermometric probes (26)
Undervoltage (27)
Reverse active overpower (32R)
Loss of field (40)
Negative sequence overcurrent (46)
Thermal image (49)
Phase overcurrent (50/51)
Residual overcurrent (50N/51N)
Voltage-controlled overcurrent (51V)
Overvoltage (59)
Residual overvoltage (59N)
Underfrequency & overfrequency (81U 81O)
High impedance restricted earth fault (87NHIZ)
Breaker failure (BF)		 Other models also available, please contact us for details.
NT30 Biased Differential For Two Or Three Sides NT30
 Protection functions
Overflux (V/Hz) (24)
Pt100 thermometric probes (26)
Undervoltage (27)
Phase undercurrent (37)
Negative sequence overcurrent (46)
Thermal image (49)
Phase overcurrent (50/51)
Residual overcurrent (50N/51N)
Overvoltage (59)
Residual overvoltage (59N)
Low impedance restricted ground fault (64REF)
Underfrequency & overfrequency (81U 81O)
Differential for transformers, generators, motors, short lines (87)
High impedance restricted earth fault (87NHIZ)
Breaker failure (BF)		 Other models also available, please contact us for details.
NT20 Biased Differential For Two Or Three Sides NT20
 Protection functions
Overflux (V/Hz) (24)
Pt100 thermometric probes (26)
Undervoltage (27)
Phase undercurrent (37)
Negative sequence overcurrent (46)
Thermal image (49)
Phase overcurrent (50/51)
Residual overcurrent (50N/51N)
Overvoltage (59)
Residual overvoltage (59N)
Low impedance restricted ground fault (64REF)
Underfrequency & overfrequency (81U 81O)
Differential for transformers, generators, motors, short lines (87)
High impedance restricted earth fault (87NHIZ)
Breaker failure (BF)		 Other models also available, please contact us for details.
NT10 Biased Differential For Two Winding Transformers NT10
 Protection functions
Pt100 thermometric probes (26)
Phase undercurrent (37)
Negative sequence overcurrent (46)
Thermal image (49)
Phase overcurrent (50/51)
Residual overcurrent (50N/51N)
Low impedance restricted ground fault (64REF)
High impedance restricted earth fault (87NHIZ)
Biased differential for transformer (87T)
Breaker failure (BF)		 Other models also available, please contact us for details.
NS20 Synchronizing Device NS20
 Protection functions
Synchro-check & synchronizing (25)
Pt100 thermometric probes (26)
Undervoltage (27)
Overvoltage (59)
Underfrequency & overfrequency (81U 81O)
Breaker failure (BF)		 Other models also available, please contact us for details.
NS10 Synchronizing Device NS10
 Protection functions
Synchro-check & synchronizing (25)
Pt100 thermometric probes (26)
Voltage and frequency regulator (90V 90F)
Breaker failure (BF)		 Other models also available, please contact us for details.
NR10 Automatic Reclosing Device NR10
 Protection functions
Pt100 thermometric probes (26)
Automatic reclosing (79)
Breaker failure (BF)		 Other models also available, please contact us for details.
NP10 Power Relay NP10
 Protection functions
Pt100 thermometric probes (26)
Undervoltage (27)
Directional active overpower (32P)
Directional reactive overpower (32Q)
Active underpower (37P)
Reactive underpower (37Q)
Power factor (55)
Overvoltage (59)
Residual overvoltage (59N)
Frequency rate of change (81R)
Underfrequency & overfrequency (81U 81O)
Breaker failure (BF)
Vector jump (DPHI)		 Other models also available, please contact us for details.
NM20 Multifunction Protection Relay NM20
 Protection functions
Pt100 thermometric probes (26)
Undervoltage (27)
Direct sequence undervoltage (27V1)
Reverse active overpower (32R)
Phase undercurrent (37)
Active underpower (37P)
Loss of field (40)
Negative sequence overcurrent (46)
Phase reversal (47)
Thermal image (49)
Phase overcurrent (50/51)
Residual overcurrent (50N/51N)
Locked rotor (51LR(48)/14)
Power factor (55)
Overvoltage (59)
Residual overvoltage (59N)
Negative sequence overvoltage (59V2)
Maximum number of starting (66)
Ground directional overcurrent (67N)
Underfrequency & overfrequency (81U 81O)
Breaker failure (BF)		 Other models also available, please contact us for details.
NM10 Multifunction Protection Relay NM10
 Protection functions
Pt100 thermometric probes (26)
Phase undercurrent (37)
Negative sequence overcurrent (46)
Thermal image (49)
Phase overcurrent (50/51)
Residual overcurrent (50N/51N)
Locked rotor (51LR(48)/14)
Maximum number of starting (66)
Breaker failure (BF)		 Other models also available, please contact us for details.
NG20 Protection Relay NG20
 Protection functions
Pt100 thermometric probes (26)
Undervoltage (27)
Reverse active overpower (32R)
Active underpower (37P)
Loss of field (40)
Negative sequence overcurrent (46)
Thermal image (49)
Phase overcurrent (50/51)
Residual overcurrent (50N/51N)
Voltage-controlled overcurrent (51V)
Power factor (55)
Overvoltage (59)
Residual overvoltage (59N)
Underfrequency & overfrequency (81U 81O)
High impedance restricted earth fault (87NHIZ)
Breaker failure (BF)		 Other models also available, please contact us for details.
NG10 Protection Relay NG10
 Protection functions
Pt100 thermometric probes (26)
Residual overcurrent (50N/51N)
Low impedance restricted ground fault (64REF)
Differential protection for generators and motors (87G/87M)
High impedance restricted earth fault (87NHIZ)
Breaker failure (BF)		 Other models also available, please contact us for details.
NC20 Multifunction Protection Relay NC20
 Protection functions
Pt100 thermometric probes (26)
Undervoltage (27)
Phase undercurrent (37)
Neutral unbalance overcurrent with inherent unbalance compensation (46N)
Thermal image (49)
Phase overcurrent (50/51)
Residual overcurrent (50N/51N)
Overvoltage (59)
Breaker failure (BF)
Discharge Timer (TD)		 Other models also available, please contact us for details.
NC10 Multifunction Protection Relay NC10
 Protection functions
Pt100 thermometric probes (26)
Phase undercurrent (37)
Neutral unbalance overcurrent with inherent unbalance compensation (46N)
Thermal image (49)
Phase overcurrent (50/51)
Residual overcurrent (50N/51N)
Breaker failure (BF)
Discharge Timer (TD)		 Other models also available, please contact us for details.
NA90 Protection Relay NA90
 Protection functions
Pt100 thermometric probes (26)
Undervoltage (27)
Thermal image (49)
Phase overcurrent (50/51)
Residual overcurrent (50N/51N)
Overvoltage (59)
Residual overvoltage (59N)
Phase directional overcurrent (67)
Ground directional overcurrent (67N)
Breaker failure (BF)		 Other models also available, please contact us for details.
NA80 Protection Relay NA80
 Protection functions
Pt100 thermometric probes (26)
Undervoltage (27)
Thermal image (49)
Phase overcurrent (50/51)
Residual overcurrent (50N/51N)
Overvoltage (59)
Residual overvoltage (59N)
Phase directional overcurrent (67)
Ground directional overcurrent (67N)
Automatic reclosing (79)
Breaker failure (BF)		 Other models also available, please contact us for details.
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Related links
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Address: Unit C,5/F,Southeast Industrial Building,611-619 Castle Peak Road,Tsuen Wan,N.T. Hong Kong.
Tel:852-24131255 Fax:852-24131277
Contacts:Mr. Chris Lau
Email: sales@lel.hk