Selection Tool for Relay Products
Click here for some FAQs about CEE's Relay productsA-Z of all relay products
ALL APPLICATIONS
Relays with Arc Detection (option)
Railway Industry
Relays for Synchronous Machines
Relays for Induction Machines
Generator protection relays
Motor protection relays
Transformer protection relays
Relays for Direct Current Systems
Find replacements for obsolete products here.
ALL ANSI CODES
2 Timers
5 Motor Start Authorisation
11 Multi-function Devices
14 Locked Rotor (speed switch)
21 Under Impedance
21FL Catenary Fault Locator
24 Overfluxing
25 Check Synchronisation
26 Thermal (with RTDs)
27 Undervoltage
27DC Direct Current Undervoltage
27P Phase Undervoltage
30 Annunciator Relays
32P Overpower (Active)
32Q Overpower (Reactive)
32RP Reverse Power
34 Programmable Logic Controllers
37I Undercurrent
37P Underpower (Active)
37Q Underpower (Reactive)
40 Field Relays
46 Negative Sequence
46L Current Unbalance (Loss of phase)
46R Current Unbalance (Reverse phase)
47 Phase Sequence Voltage
48 Too Long Start
49 Thermal Image
49L Cable Thermal Protection
49M Motor Thermal Overload
49T Transformer Thermal Overload
50 Instantaneous Phase Overcurrent
50BF Overcurrent & Breaker Failure
50FL Catenary Fault (Overcurrent)
50H Harmonic Overcurrent (instantaneous)
50N Instantaneous Earth Fault
50NBF Earth Fault & Breaker Failure
50V/51V Voltage-restrained Overcurrent
51 Time-delayed Overcurrent
51H Harmonic Overcurrent (Time delay)
51LR/51M Locked Rotor (overcurrent)
51N Time-delayed Earth Fault
52BF Circuit Breaker Failure (Trip Upstream)
55 Out-of-step / Power Factor Relays
59 Overvoltage
59DC Direct Current Overvoltage
59G Neutral Displacement Overvoltage
59N Zero-sequence Overvoltage
59P Positive Sequence Overvoltage
60 Voltage Balance
64 Sensitive Earth Fault
64F Rotor Earth Fault
64REF Restricted Earth Fault
64S Field Ground (Stator Earth Fault)
66 Number of Starts
67 Directional Overcurrent
67N Directional Earth Fault
68 Blocking Relays
68H Harmonic Inrush Blocking
74TC Trip Circuit Supervision
76 DC Overcurrent Relay
76BF Breaker Failure (DC)
78 Phase Angle / Vector Jump
79 Reclosers
81 Over-/Under-Frequency
81R Rate of Change of Frequency
82 Recloser (Direct Current)
86 Lock-out Relays
87 Differential Relay
87B Busbar Differential Relay
87FL Catenary Fault (Differential)
87M Machine Differential Relay
87N Low Impedance Restricted Earth Fault
87REF Restricted Earth Fault
87T Transformer Differential Relay
90 Regulating Devices
ALL PRODUCT RANGES
NP900
NP800
PROCOM
Technirel
Static Relays
ANSI function 78 (vector jump) can be used in place of function 81R (rate of change of frequency). Some relays have both functions.
Click the image
ANSI Code 81R: Rate of Change of Frequency
Can’t find what you’re looking for? If you need more information on CEE’s current products or advice on replacing obsolete products, please get in touch.
NPG915 Advanced generator protection relay including vector-shift and rate-of-change-of-frequency protection. ANSI codes 50/51/50N/51N(S)/50H/51H/68H/46/46R/46L/49M/67/67N/59/27/59P/27P/47/59N/81O/81U/81R/40 /51V/64S/32/32R/37/21/24/78/50BF/52BF/60/74TC/25/64
NPF915 Advanced feeder protection relay for phase fault, earth fault, voltage and frequency protection. ANSI codes 50/51/50N/51N/67/67N/50H/51H/68H/46/46R/46L/49L/87N/59/59N/27/59P/27P/47/81O/81U/81R/78/32/37/32R/ 50BF/52BF/21FL/60/74TC/25/79/64/68.
NPV911 Voltage and frequency relay with synchronisation checking across up to three circuit breakers. For bus-bar protection or load shedding schemes. ANSI codes 59/27/59N/59P/27P/47/78/81O/81U/81R/60/74TC/25
