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ANSI (IEEE) Protective Device Numbering 

The widely used United Sates standard ANSI/IEEE C37.2 'Electrical Power System Device Function Numbers, Acronyms, and Contact Designations' deals with protective device function numbering and acronyms.   Even in those parts of the world where IEC standards are predominate, the use of ANSI numbering for protective device functions is still common place.

Protective Device Numbers

Protective relays are commonly referred to by standard device numbers. For example, a time overcurrent relay is designated a 51 device, while an instantaneous overcurrent is a 50 device. Multifunction relays have combinations of device numbers. A 27/59 device, for example, is a combination under/over voltage relay. Letters can be added to clarify application (87T for transformer differential, 59G for ground overvoltage).

  • 1 – Master Element
  • 2 – Time Delay Starting or Closing Relay
  • 3 – Checking or Interlocking Relay
  • 4 – Master Contactor
  • 5 – Stopping Device
  • 6 – Starting Circuit Breaker
  • 7 – Rate of Change Relay
  • 8 – Control Power Disconnecting Device
  • 9 – Reversing Device
  • 10 – Unit Sequence Switch
  • 11 – Multi-function Device
  • 12 – Overspeed Device
  • 13 – Synchronous-speed Device
  • 14 – Underspeed Device
  • 15 – Speed – or Frequency, Matching Device
  • 16 – Data Communications Device
  • 17 – Shunting or Discharge Switch
  • 18 – Accelerating or Decelerating Device
  • 19 – Starting to Running Transition Contactor
  • 20 – Electrically Operated Valve
  • 21 – Distance Relay
  • 22 – Equalizer Circuit Breaker
  • 23 – Temperature Control Device
  • 24 – Volts Per Hertz Relay
  • 25 – Synchronizing or Synchronism-Check Device
  • 26 – Apparatus Thermal Device
  • 27 – Undervoltage Relay
  • 28 – Flame detector
  • 29 – Isolating Contactor or Switch
  • 30 – Annunciator Relay
  • 31 – Separate Excitation Device
  • 32 – Directional Power Relay
  • 33 – Position Switch
  • 34 – Master Sequence Device
  • 35 – Brush-Operating or Slip-Ring Short-Circuiting Device
  • 36 – Polarity or Polarizing Voltage Devices
  • 37 – Undercurrent or Underpower Relay
  • 38 – Bearing Protective Device
  • 39 – Mechanical Condition Monitor
  • 40 – Field (over/under excitation) Relay
  • 41 – Field Circuit Breaker
  • 42 – Running Circuit Breaker
  • 43 – Manual Transfer or Selector Device
  • 44 – Unit Sequence Starting Relay
  • 45 – Abnormal Atmospheric Condition Monitor
  • 46 – Reverse-phase or Phase-Balance Current Relay
  • 47 – Phase-Sequence or Phase-Balance Voltage Relay
  • 48 – Incomplete Sequence Relay
  • 49 – Machine or Transformer, Thermal Relay
  • 50 – Instantaneous Overcurrent Relay
  • 51 – AC Inverse Time Overcurrent Relay
  • 52 – AC Circuit Breaker
  • 53 – Exciter or DC Generator Relay
  • 54 – Turning Gear Engaging Device
  • 55 – Power Factor Relay
  • 56 – Field Application Relay
  • 57 – Short-Circuiting or Grounding Device
  • 58 – Rectification Failure Relay
  • 59 – Overvoltage Relay
  • 60 – Voltage or Current Balance Relay
  • 61 – Density Switch or Sensor
  • 62 – Time-Delay Stopping or Opening Relay
  • 63 – Pressure Switch
  • 64 – Ground Detector Relay
  • 65 – Governor
  • 66 – Notching or Jogging Device
  • 67 – AC Directional Overcurrent Relay
  • 68 – Blocking or "Out-of-Step" Relay
  • 69 – Permissive Control Device
  • 70 – Rheostat
  • 71 – Liquid Level Switch
  • 72 – DC Circuit Breaker
  • 73 – Load-Resistor Contactor
  • 74 – Alarm Relay
  • 75 – Position Changing Mechanism
  • 76 – DC Overcurrent Relay
  • 77 – Telemetering Device
  • 78 – Phase-Angle Measuring Relay
  • 79 – AC Reclosing Relay
  • 80 – Flow Switch
  • 81 – Frequency Relay
  • 82 – DC Reclosing Relay
  • 83 – Automatic Selective Control or Transfer Relay
  • 84 – Operating Mechanism
  • 85 – Communications,Carrier or Pilot-Wire Relay
  • 86 – Lockout Relay
  • 87 – Differential Protective Relay
  • 88 – Auxiliary Motor or Motor Generator
  • 89 – Line Switch
  • 90 – Regulating Device
  • 91 – Voltage Directional Relay
  • 92 – Voltage and Power Directional Relay
  • 93 – Field Changing Contactor
  • 94 – Tripping or Trip-Free Relay
  • 95 to 99 – For specific applications where other numbers are not suitable
* for a full definition of each function, please refer to the ANSI/IEEE C37.2 standard

Prefixes and Suffixes

Letters and numbers may be used as prefixes or suffixes to device function numbers to provide a more specific definition of the function. Prefixes and suffixes should, however, be used only when they accomplish a useful purpose.

ANSI IEC Comparison

Notes:      1. for high set and instantaneous tripping, '>' can be replaced with '>>' or '>>'       2. '3' can be placed before designations to indicate three phase, i.e. 3I<

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94 trip free relay

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94 trip free relay

NEW RANGE OF TRIP RELAYS K94

The trip relay (defined with the acronym K94 in the ANSI standards) is a fast-acting relay designed to ensure a high switching speed together with a high breaking capacity in order to manage inductive and high direct current loads.

94 trip free relay

Main application:

This range of trip relays is commonly used in the switches control chains (both medium and high voltage) and more in general in all rapid fault extinction duty, where it is essential to place the system in safe conditions in the shortest possible time.

The RGMVX, RMMVX and RMMV relays are highly reliable products with high electrical and safety performance. Among the most important options that can be envisaged in this range of fast relays is found the HIGH BURDEN option.

The term HIGH BURDEN recalls the concept of "high immunity" or "imperturbability" to those disturbances that can form along the lines fed in direct current.

It is therefore important that a relay powered by long DC cables will be immune to capacitive discharges due to ground leakage from the power lines or from the propagation of induced lightning strikes.

The same term " BURDEN " also means "responsibility", and underlines the high responsibility for intervention / non-intervention for this type of component.

Thanks to the combination of size, surface and materials, the relay contacts are performing and reliable even in switching very low loads (a few mA) without resorting to gold plating treatments on the contact pads.

Available in versions 4,8,12 SPDT contacts , with magnetic blow-out and manual set/reset operation .

By clicking on INFO you can check out the complete range of these trip relay models.

94 trip free relay

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what is the difference between the 94 lockout relay and 86 lock out relay. I have noticed that the 94 lockout relay is activated when the distance realy is activated and 86 is activated when the 87T differential is activated. but why can't the same lockouts be used for both the protection schemes

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Answers were Sorted based on User's Feedback

Answer / syed furqan akhter

94 relay shall not be called out the lockout relay.It is basically a self reset relay.Its contacts operate till the fault persist or its coil energizes and when its de- energizeits contact reach its normal position. Its usage is where Autoreclosing is required to close the Circuit breaker whenever temporary fault occurs.Therefore in overhead lines this relay (94)is used. While 86 relay is a lockout relay means once its coil enrgizes its contact will be operated and will never come its normal position until it is reset by hand or electrically. Therefore it is used where permenant faults occurs and no autoreclosing scheme is posible.

Answer / gtmanikandan

86 lock out relay is hand reset used for mechanical protection (permanent fault) & 94 lockout relay is self reset used for tranisent fault (temprovery fault condition) this is major different between 86 and 96 lockout relay

Answer / jayesh n. pillai

86 LOCK OUT RELAY IS AN ELECTRICALLY OPERATED HAND, OR LECTRICALLY RESET RELAY OR DEVICE THAT FUNCTIONS TOSHUT DWN OR HOLD AN EQUIPMENT OUT OF SERVICE, OR BOTH, UPON THE OCCURRENCE OF ABNORMAL CONDITIONS. 94TRIPPIN RELAY IS HAVING FUNCTION TO TRIP A CIRCUIT BREAKER, CONTACTOR OR EQUIPMENT, OR TO PERMIT IMMEDIATE TRIPPING BY OTHER DEVICES. OR TO PREVENT IMMEDIATE RECLOSURE OF ACIRCUIT INTRRUPTER IF IT SHOULD OPEN AUTOMATICALLY EVEN THOUGH ITS CLOSING CIRCUIT IS MAINTAINED CLOSED.

Answer / bilal din

94 is ANSI code for tripping relay and 86 is ANSI code of Louck out relay. Both have specific fuction and can not be interchangable, means we can not use lockout relay for trip fucntion and vice versa,...

Answer / ayman elwardani

86 Lockout relays are used by many utilities in electrical power transmission substations to trip and hold out of equipment service within a protected zone on the occurrence of protection relay operation which requires inspection and/or repair before the zone may be safely placed back in service. The original intent of lockout was that on operation, maintenance or operating personnel would inspect and repair as required the locked-out zone, and when clear, would reset the lockout allowing operators to place the element back in service. However in recent decades, it has become normal to remotely control substations, resulting in the absence of on-site personnel to reset a lockout in an emergency situation On the other hand, 94 inter-trip relay is used for up or down stream backup protection to prevent the other side breaker from supplying the faulty zone. The inter-trip signal shall be cleared as the fault cleared and associated relay has been reset.

Answer / sachidananda pal

86 is actually an Electrically/Hand reset Master trip relay that trips both the primary & Secondary of a Transformer whereas 94 is a lockout relay that is used in transmission line protection eg. in an Auto recloser.In case of a fault the Autorecloser shall start it's O-t-CO-T-CO-T-CO-T-CO operation. After un successfuly trying to reclose the line, the 94 Lockout relay shall act afetr the time duration set & will put the Autorecloser in an Lockout condition so that there are no further reclosing attempts.

Answer / venkatesan

86 lockout relay is a high speed tripping relay which is used to block close and trip the circuit breaker in the event of fault signal received from protective relays. 94 is an interposing relay which is used for high current drive application. Example: A Open or close signal from plc. The PLC output contact is designed for low current drive. To prevent PLC damage we normally use interposing relay.

Answer / yaldilip

94 is self reset relay trip relay 86 is lockout relay having two coils trip coil and reset coil once the trip come the trip coil will energize and plug will down once the reset coil energize and the fault will clear tan reset coil will energize and the trip coil will drop.

Answer / ajay khandait.

Lockout relay is handreset relay in this case both the relays are hand reset relay. only difference is that 94 lockout relay is used for line protection and can also be provided with auto reclosing facility. If the auto reclosing is not successful then in that case 94 goes to Lockout state and shall be manually resetted. In case of 86 there is no Auto reclosing feature available. It goes to lockout state directly.

Answer / k.prakashchandra

94 lockout relay is for line fault only. 86 lockout relay is master trip relay. It trips both primry and secondary of the transformer as the fault is of serious nature.

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ANSI Device Numbers

The ANSI standard device numbers ( As per ANSI/IEEE standard C37.2) are used in the design of an electrical power system. These devices protect the electrical network in the case of a fault in the system. The list of ANSI device numbers with their acronyms is as given below.

List of ANSI device numbers and acronyms

ANSI device numbers

  • 1 – Master Element
  • 2 – Time-delay Starting or Closing Relay
  • 3 – Checking or Interlocking Relay, complete Sequence
  • 4 – Master Protective
  • 5 – Stopping Device, Emergency Stop Switch
  • 6 – Starting Circuit Breaker
  • 7 – Rate of Change Relay
  • 8 – Control Power Disconnecting Device
  • 9 – Reversing Device
  • 10 – Unit Sequence Switch
  • 11 – Multifunction Device
  • 12 – Overspeed Device
  • 13 – Synchronous-Speed Device
  • 14 – Underspeed Device
  • 15 – Speed or Frequency Matching Device
  • 16 – Data Communications Device
  • 17 – Shunting or Discharge Switch
  • 18 – Accelerating or Decelerating Device
  • 19 – Starting-to-Running Transition Contactor
  • 20 – Electrically-Operated Valve ( Solenoid Valve )
  • 21 – Distance Relay
  • 21G – Ground Distance
  • 21P – Phase Distance
  • 22 – Equalizer circuit breaker
  • 23 – Temperature control device, Heater
  • 24 – Volts per hertz relay
  • 25 – Synchronizing or synchronism-check device
  • 26 – Apparatus thermal device, Temperature Switch
  • 27 – Undervoltage relay
  • 27P – Phase Undervoltage
  • 27S – DC undervoltage relay
  • 27TN – Third Harmonic Neutral Undervoltage
  • 27TN/59N – 100% Stator Earth Fault
  • 27X – Auxiliary Undervoltage
  • 27 AUX – Undervoltage Auxiliary Input
  • 27/27X – Bus/Line Undervoltage
  • 27/50 – Accidental Generator Energization
  • 28 – Flame Detector
  • 29 – Isolating Contactor
  • 30 – Annunciator Relay
  • 31 – Separate Excitation Device
  • 32 – Directional Power Relay
  • 32L – Low Forward Power
  • 32H – High Directional Power
  • 32N – Wattmetric Zero-Sequence Directional
  • 32P – Directional Power
  • 32R – Reverse Power
  • 33 – Position Switch
  • 34 – Master Sequence Device
  • 35 – Brush-Operating or Slip-ring Short Circuiting Device
  • 36 – Polarity or Polarizing Voltage Device
  • 37 – Undercurrent or Underpower Relay
  • 37P – Underpower
  • 38 – Bearing Protective Device / Bearing Rtd
  • 39 – Mechanical Condition Monitor ( Vibration )
  • 40 – Field Relay / Loss of Excitation
  • 41 – Field Circuit Breaker
  • 42 – Running Circuit Breaker
  • 43 – Manual Transfer or Selector Device
  • 44 – Unit Sequence Starting Relay
  • 45 – Fire Detector
  • 46 – Reverse-Phase or Phase Balance Current Relay or Stator Current Unbalance
  • 47 – Phase-Sequence or Phase Balance Voltage Relay
  • 48 – Incomplete Sequence Relay / Blocked Rotor
  • 49 – Machine or Transformer Thermal Relay / Thermal Overload
  • 49RTD – RTD Biased Thermal Overload
  • 50 – Instantaneous Overcurrent Relay
  • 50BF – Breaker Failure
  • 50DD – Current Disturbance Detector
  • 50EF – End Fault Protection
  • 50G – Ground Instantaneous Overcurrent
  • 50IG – Isolated Ground Instantaneous Overcurrent
  • 50LR – Acceleration Time
  • 50N – Neutral Instantaneous Overcurrent
  • 50NBF – Neutral Instantaneous Breaker Failure
  • 50P – Phase Instantaneous Overcurrent
  • 50SG – Sensitive Ground Instantaneous Overcurrent
  • 50SP – Split Phase Instantaneous Current
  • 50Q – Negative Sequence Instantaneous Overcurrent
  • 50/27 – Accidental Energization
  • 50/51 – Instantaneous / Time-delay Overcurrent relay
  • 50/74 – Ct Trouble
  • 50/87 – Instantaneous Differential
  • 51 – AC Time Overcurrent Relay
  • 51G – Ground Time Overcurrent
  • 51LR – AC inverse time overcurrent (locked rotor) protection relay
  • 51N – Neutral Time Overcurrent
  • 51P – Phase Time Overcurrent
  • 51R – Locked / Stalled Rotor
  • 51V – Voltage Restrained Time Overcurrent
  • 51Q – Negative Sequence Time Overcurrent
  • 52 – AC circuit breaker
  • 52a – AC circuit breaker position (contact open when circuit breaker open)
  • 52b – AC circuit breaker position (contact closed when circuit breaker open)
  • 53 – Exciter or Dc Generator Relay
  • 54 – Turning Gear Engaging Device
  • 55 – Power Factor Relay
  • 56 – Field Application Relay
  • 57 – Short-Circuiting or Grounding Device
  • 58 – Rectification Failure Relay
  • 59 – Overvoltage Relay
  • 59B – Bank Phase Overvoltage
  • 59P – Phase Overvoltage
  • 59N – Neutral Overvoltage
  • 59NU – Neutral Voltage Unbalance
  • 59X – Auxiliary Overvoltage
  • 59Q – Negative Sequence Overvoltage
  • 60 – Voltage or Current Balance Relay
  • 60N – Neutral Current Unbalance
  • 60P – Phase Current Unbalance
  • 61 – Density Switch or Sensor
  • 62 – Time-Delay Stopping or Opening Relay
  • 63 – Pressure Switch Detector
  • 64 – Ground Protective Relay
  • 64F – Field Ground Protection
  • 64R – Rotor earth fault
  • 64REF – Restricted earth fault differential
  • 64S – Stator earth fault
  • 64S – Sub-harmonic Stator Ground Protection
  • 64TN – 100% Stator Ground
  • 65 – Governor
  • 66 – Notching or Jogging Device/Maximum Starting Rate/Starts Per Hour/Time Between Starts
  • 67 – AC Directional Overcurrent Relay
  • 67G – Ground Directional Overcurrent
  • 67N – Neutral Directional Overcurrent
  • 67Ns – Earth fault directional
  • 67P – Phase Directional Overcurrent
  • 67SG – Sensitive Ground Directional Overcurrent
  • 67Q – Negative Sequence Directional Overcurrent
  • 68 – Blocking Relay / Power Swing Blocking
  • 69 – Permissive Control Device
  • 70 – Rheostat
  • 71 – Liquid Switch, Level Switch
  • 72 – DC Circuit Breaker
  • 73 – Load-Resistor Contactor
  • 74 – Alarm Relay
  • 75 – Position Changing Mechanism
  • 76 – DC Overcurrent Relay
  • 77 – Telemetering Device, Speed Sensor
  • 78 – Phase Angle Measuring or Out-of-Step Protective Relay
  • 78V – Loss of Mains
  • 79 – AC Reclosing Relay / Auto Reclose
  • 80 – Liquid or Gas Flow Relay
  • 81 – Frequency Relay
  • 81O – Over Frequency
  • 81R – Rate-of-Change Frequency
  • 81U – Under Frequency
  • 82 – DC Reclosing Relay
  • 83 – Automatic Selective Control or Transfer Relay
  • 84 – Operating Mechanism
  • 85 – Pilot Communications, Carrier or Pilot-Wire Relay
  • 86 – Lock-Out Relay, Master Trip Relay
  • 87 – Differential Protective Relay
  • 87B – Bus Differential
  • 87G – Generator Differential
  • 87GT – Generator/Transformer Differential
  • 87L – Segregated Line Current Differential
  • 87LG – Ground Line Current Differential
  • 87M – Motor Differential
  • 87O – Overall Differential
  • 87PC – Phase Comparison
  • 87RGF – Restricted Ground Fault
  • 87S – Stator Differential
  • 87S – Percent Differential
  • 87T – Transformer Differential
  • 87V – Voltage Differential
  • 88 – Auxiliary Motor or Motor Generator
  • 89 – Line Switch
  • 90 – Regulating Device
  • 91 – Voltage Directional Relay
  • 92 – Voltage And Power Directional Relay
  • 93 – Field-Changing Contactor
  • 94 – Tripping or Trip-Free Relay
  • 95 – For specific applications where other numbers are not suitable
  • 96 – Transmitter
  • 97 – For specific applications where other numbers are not suitable
  • 98 – For specific applications where other numbers are not suitable
  • 99 – For specific applications where other numbers are not suitable

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FAST TRIP RELAY

94 trip free relay

Description

             The relay type E94 fast trip relay or auxiliary tripping relay is intended to be used in control and protection circuit for applications requiring high reliability and availability such as power stations, substations, railways and industrial plants. The relay has been designed for flush mounting style, the robust contacts are characterized by high making/breaking capacity, overload capacity and continuous current intensity capacity. Their high degree of protection ensure reliable operation in tropical and/or salty sea air ambient conditions.

       Regarding to the auxiliary tripping relay or fast trip relay. The Pick-up time of the relay E94 is less than 8ms. and Drop-out time is less than 40ms. The relay type E94 are consist in two versions, the first version is E94-3 which has three changeover contacts, flush mounting type with screw-type terminals at the rear. The second is E94-6 which has six changeover contacts and other specifications are the same as the first one.

The relays E94 series comply with the IEC/EN, IEEE standards (type test and routine test)

94 trip free relay

Technical Data

94 trip free relay

Connection Diagrams

94 trip free relay

Product Coding

94 trip free relay

IMAGES

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COMMENTS

  1. Anti Pumping And Lockout Relays

    The trip free mechanism/ Anti pumping feature permits the circuit breaker to be tripped by protective relay even if it is under process of closing. Thus auxiliary relay (or sometimes the inbuilt feature of circuit breaker) which prevent alternate tripping and closing of the circuit breaker if closing push button is held close during fault is ...

  2. ANSI Codes

    94. Tripping or Trip-Free Relay. is a relay that function to trip a circuit breaker, contactor or equipment, or to permit immediate tripping by other devices; or to prevent immediate re -closure of a circuit interrupter if it should open automatically even though its closing circuit is maintained closed.

  3. ANSI-94

    Arteches' master trip relays (ANSI-94) are specially designed to exceed the requirements of all kind of protection and control circuits, like those than operates circuit breakers, contactors and other primary switching equipment in power plants, substations or power distribution systems at heavy industries. With a high breaking capacity, low and high burden options, models from 2 to 16 ...

  4. 86 and 94 lockout relays

    86 versus 94 86 versus 94 Bejoyengineer- A 94 relay is a tripping relay that does not latch or require a manual reset. An 86 lockout is latching relay used for catastrophic failures. It locks out the breakers to prevent reenergizing the system. An 86 requires a manual reset (some can be reset remotely). It makes the operator think about what ...

  5. ANSI (IEEE) Protective Device Numbering

    Protective relays are commonly referred to by standard device numbers. For example, a time overcurrent relay is designated a 51 device, while an instantaneous overcurrent is a 50 device. ... 94 - Tripping or Trip-Free Relay ; 95 to 99 - For specific applications where other numbers are not suitable * for a full definition of each function ...

  6. PDF Protection and Control Device Numbers and Functions

    A device, which is controlled by device function 1 or the equivalent, and the required permissive and protective devices which serve to make and break the necessary control circuits to place equipment into operation under the desired conditions and to take it out of operation under abnormal conditions. 5. Stopping device.

  7. PDF The importance of trip free operation and its characteristics

    Definitions. In the most general definition of "Trip-Free," the contacts of the circuit breaker must return to the open position and remain there when an opening operation follows a closing operation, regardless of whether the closing signal, force, or action is maintained. A common variant is called "Electrically Trip-Free.".

  8. PDF PRC-005- ction

    This definition extends to IEEE device # 86 (lockout relay) and IEEE device # 94 (tripping or trip-free relay) as these devices are tripping relays that respond to the trip signal of the protective relay that processed the signals from the current and voltage sensing devices. Relays that respond to non-electrical inputs or impulses (such as ...

  9. PDF ANSI/IEEE Standard Device Numbers

    In North America protective relays are generally referred to by standard device numbers. Letters are sometimes added to specify the application (IEEE Standard C37.2-2008). ... 92 - Voltage and Power Directional Relay 94 - Tripping or Trip-Free Relay Suffixes indicating zone of protection B -Bus G - Ground or generator L—Line N -Neutral ...

  10. Common IEEE Device Numbers

    94 Tripping or Trip-Free Relay Functions to trip a circuit breaker, contactor or equipment, or to permit immediate tripping by other devices; or to prevent immediate reclosure of a circuit interrupter if it should open automatically even though its closing circuit is maintained closed.

  11. Trip and lockout relays

    Arteche manufactures trip and lockout relays with a wide range of options to met each application requirements. Reliability an performance by default for safety-critical and most demanding applications in power system environments like HV breaker operation or control and command circuits in high voltage substations / bulk generation power plants / HV power system control.

  12. PDF MVAJ05 10 20 Tripping and Control Relays

    For type MVAJ 20 relays, each element is reset separately. Electrical, Hand/Electrical-reset Relays (Type MVAJ 054/055/104/105/ 204/205) These relays operate similarly to the hand-reset relays. The internal break contact in series with the operating coil breaks the coil circuit and reduces the burden to zero for all relays in the low burden ...

  13. Lockout relay (master trip relay) in substation protection and ...

    The master trip relay can operate as a hub of multiple protection relays trip commands and drive multiple subsequent contacts. This makes the relay a protagonist to execute simultaneous commands like breaker trips, interlocks, alarms, data display, SCADA extensions, and lockouts. Figure 1 - Trip function interface: Soft Logic to a hard-wired ...

  14. Trip Relays K94, the New Range of Trip Relays With 4-8-12 Contacts

    The trip relay (defined with the acronym K94 in the ANSI standards) is a fast-acting relay designed to ensure a high switching speed together with a high breaking capacity in order to manage inductive and high direct current loads.. Main application: This range of trip relays is commonly used in the switches control chains (both medium and high voltage) and more in general in all rapid fault ...

  15. PDF ANSI Standard Device Numbers & Common Acronyms

    DUTT Direct Underreaching Transfer Trip E Exciter F Feeder, Field, Filament, Filter, or Fan G Ground or Generator GC Ground Check H Heater or Housing L Line or Logic ... 94 Tripping or Trip-Free Relay 50/74 Ct Supervision 27/50 Accidental Generator Energization 27TN/59N 100% Stator Earth Fault.

  16. what is the difference between the 94 lockout relay and 86

    86 is actually an Electrically/Hand reset Master trip relay. that trips both the primary & Secondary of a Transformer. whereas 94 is a lockout relay that is used in transmission. line protection eg. in an Auto recloser.In case of a fault. the Autorecloser shall start it's O-t-CO-T-CO-T-CO-T-CO. operation.

  17. 86 vs 94 lockout relays

    86 vs 94 lockout relays - a few questions. From my limited understand of electrical control/protection systems, these lockouts are used as protection relays for transformers. I also think I heard somewhere that while both relays can obviously trip, the 86 requires a manual replacement, while the 94 does not. Can anyone shed more light on this?

  18. ANSI Device Numbers and Acronyms

    List of ANSI device numbers and acronyms. 1 - Master Element. 2 - Time-delay Starting or Closing Relay. 3 - Checking or Interlocking Relay, complete Sequence. 4 - Master Protective. 5 - Stopping Device, Emergency Stop Switch. 6 - Starting Circuit Breaker. 7 - Rate of Change Relay. 8 - Control Power Disconnecting Device.

  19. ANSI device numbers

    In Electrical Power Systems and Industrial Automation, ANSI Device Numbers can be used to identify equipment and devices in a system such as relays, circuit breakers, or instruments.The device numbers are enumerated in ANSI/IEEE Standard C37.2 "Standard for Electrical Power System Device Function Numbers, Acronyms, and Contact Designations". Many of these devices protect electrical systems and ...

  20. 86 Lockout Relay Vs 94 Tripping Relay

    Electrical Protection Course

  21. RXR4 trip relay

    General specs. Relay wiring diagram. Tripping applications with very high speed requirements. Contacts configuration. 4 Changeover / 4PDT Form-C. General standards. IEC 61000, IEC 60947, IEC 60255 and ANSI C37.90. Burden configuration. ESI 48-4 EB1: 1983 Low Burden.

  22. Fast Trip Relay

    The relay type E94 fast trip relay or auxiliary tripping relay is intended to be used in control and protection circuit for applications requiring high reliability and availability such as power stations, substations, railways and industrial plants. The relay has been designed for flush mounting style, the robust contacts are characterized by ...