International electrical symbol

If you are new to the drawings provided by the foreign party, you may be confused by the various component numbers on the drawings. In fact, these numbers are standard, whether it is TOSHIBA or GE design drawings, the same component, The number is constant, such as 87 is the differential relay, 51 is the overcurrent relay. These numbers actually follow the IEEE Std C37.2-1996 standard, which is used in various wiring diagrams, manuals, and manuals. Referring to the table on the right, you can easily find out the components and functions represented by each number, making it easy for you to become a master of reading!
1--master element
The main components are components such as control switches. It directly or indirectly passes the intermediate components such as protection relays and time delay relays to put the equipment into or out of operation.
Note: This number is usually used for manually operated components. This number can also be used if there is no other function number for an electrical or service component.
2--time-delay starting or closing relay
A delayed start or close relay whose function is to provide the desired amount of delay at any time before or after the switching procedure or protection relay system action. Except as defined by function numbers 48, 62, 79 and 82.
3--checking or interlocking relay
A check or interlock relay, in the device, a component that reflects the working position of other components or some predetermined condition, can be used to determine whether a working program continues, or to stop or verify the working position of some components and some predetermined conditions. .
4--master contactor
The main contactor is an element that is controlled by the component 1 and its equivalent components, intermediate relays, protective components, and the like. The job is to turn the necessary control loop on or off to put the device into operation under specified conditions or to exit it under other conditions and abnormal conditions.
5--stopping device
A shutdown component is a control component that is primarily used to stop a device and exit operation. This component can be operated manually or automatically, but it can block electrical functions in the event of an abnormal condition (see component 86 function)
6--starting circuit breaker
The breaker is activated and its main function is to connect a machine to the power supply at the starting voltage.
7--rate-of-change relay
Rate of change relay. Acts when the measured rate of change exceeds the threshold. Except as defined by element 63.
8--control power disconnecting device
Operating the power cut-off element is an isolated component such as a knife switch, circuit breaker, or plug-in fuse. Used to connect or disconnect the control bus or device to the operating power supply. (The operation power supply includes an auxiliary power supply for supplying small motors, heaters, etc.)
9--reversing device
The reverse element is used to reverse the magnetic field of the motor or to perform any other reverse function.
10--unit sequence switch
The unit sequence switch is used to change the order so that each unit inputs or withdraws from the multi-element device.
11--multifunction device
Multi-function components. Three or more important functions can be completed, and these functions can only be completed by a combination of multiple functional components. All functions that can be performed on this component should be described in the drawing, component function definition list or relay setting list.
Note: If the component has only 2 functions, it is indicated by the number of these two functions.
12--overspeed device
The overspeed element is usually a directly connected speed switch that acts when the motor is overspeeding.
13--synchronous-speed device
Synchronous speed components, such as centrifugal speed switches, differential frequency relays, voltage relays, under-current relays, or any form of component operate at near synchronous speeds of the motor.
14--underspeed device
Underspeed component, when the motor speed drops below a given value.
15--speed or frequency matching device
A speed or frequency matching component whose function is to adjust and maintain the speed or frequency of a motor or a system equal to or close to the speed or frequency of another motor or system.
16--not used
17--shunting or discharge switch
A shunt or discharge switch that turns any device other than a resistor on or off, such as the field windings of the motor, armature windings, capacitors, and reactors. (This type of device does not include devices 6 and similar devices that may be used as shunts during motor starting, and does not include devices for switching resistors.)
18--accelerating or decelerating device
Acceleration or deceleration element, used to close the circuit that causes the motor to increase or decelerate.
19--starting-to-running transition contactor
The start-run transition contactor is an element that automatically switches the motor from the starting wiring state to the operating wiring state.
20--electrically operated valve
An electrically operated valve is a valve that is used for electrical operation control and monitoring on fluid piping. (The valve function can be illustrated by a suffix letter)
21--distance relay
Distance relay, a relay that operates when the admittance, impedance, or reactance of the loop increases or decreases beyond a predetermined value.
22--equalizer circuit breaker
The equalization current circuit breaker is used in a multi-unit device to turn on or off the adjustment circuit of the motor magnetic field, the circuit breaker or its power balance device.
23--temperature control device
The temperature control element, the reaction motor device, the element whose temperature rises or falls in the medium, acts when the temperature exceeds or falls below a predetermined value. (In the case of a thermostat, when the temperature drops to a predetermined value, the heater of the switchgear is closed)
24--volts per hertz relay
Voltage/frequency relay. When the ratio of voltage to frequency is above or below a predetermined value, the relay has transient or time delay characteristics.
25--synchronizing or synchronism-check relay
Check the relay synchronously or synchronously. The synchronizing element provides an output that closes the two loops at zero phase angle difference, which does not necessarily have voltage and speed control. Simultaneously checking the relays causes the two circuits to be juxtaposed within the specified voltage, phase difference and frequency.
26--apparatus thermal device
Device thermal element that acts when the temperature of the protected device or other medium exceeds or falls below a predetermined value.
27--under voltage relay
Undervoltage relay, a component that operates when the voltage drops to a given value.
28--flame detector
A flame detector is a component that monitors a central flame such as a gas turbine or a steam boiler.
29--isolating contactor or switch
Isolation contactors or switches are used to isolate the primary circuit from other circuits during accident operation, maintenance, and testing.
30--annunciator relay
The signal relay is a non-automatic reset component that provides an intuitive display and a lockout function when the protection component is activated.
31--separate excitation device
The excitation component, when starting, connects the synchronous motor and the excitation field circuit to the power source of the excitation field, or electrifies the excitation circuit and the arc extinguishing circuit of the power rectifier.
32--directional power relay
The power direction relay acts when a given power flow direction reaches a predetermined value, such as the engine losing the prime mover and becoming the reverse power caused by the motor running.
33--position switch
The position switch turns the contact on or off when the working position of the main component or equipment component of the component function number reaches a given position.
34--mater sequence device
Main program components, such as electrically operated multi-node switches, computer program components, and the like. When a device is started, stopped, or otherwise sequenced, it is used to determine the sequence of operations of the major components in the device.
35--brush-operating or slip-ring short-circuiting device
A brush or slip ring shorting element can be used to lift the carbon brush that inserts or moves the motor, or shorts its slip ring or for contacting or withdrawing the steering gear.
36--polarity or polarization voltage device
Polar or polarized voltage component. Manipulating or allowing another component to be put into operation only under predetermined conditions, or for detecting the presence of a polarized voltage in the device.
37--undercurrent or underpower relay
Undercurrent or low power relay. A relay that acts when the current or power flow drops to a predetermined value.
38--bearing protective device
Bearing protection components. A relay that operates when the bearing is overheated or when the bearing is in an abnormal mechanical vibration, such as a transitional wear that eventually causes the bearing temperature to be too high.
39--mechanical condition monitor
Mechanical condition monitors are components that operate under abnormal mechanical conditions of the equipment, such as excessive vibration, eccentric expansion, slanting or seal damage, but do not include bearing-related components 38.
40--field relay
Excitation relay. When the excitation current of the unit fails, or when it is lower than the given value, or when the armature reactive current of an AC motor is too large, and the abnormal magnetic field is excited, it acts.
41--field circuit breaker
The excitation circuit breaker is a working component that turns on or withdraws a motor excitation circuit.
42--running circuit breaker
The main function of the circuit breaker is to connect a motor to its power source under operating or operating voltage. It can also be used as a contactor. It can be used in series with a circuit breaker or other protection device, mainly for frequent opening and closing. Operating circuit breaker.
43--manual transfer or selector device
Manually convert or select components. Switch control loops to change the logic of switching devices or other components.
44--unit sequence starting relay
The unit sequence starts the relay. It is the component that starts the next effective unit when the unit equipment fails or when the above unit works abnormally.
45--atmospheric condition monitor
Atmospheric condition monitor. An element that works when there are destructive atmospheric conditions such as a mixture of smoke and explosion, smoke, and flare.
46--rever-phase or phase-balance current relay
Inverting or phase balanced current relay. When the multiphase current is reversed, or unbalanced, its negative sequence component exceeds the given value when the relay operates.
47--phase-sequence or phase-balance voltage relay
Phase sequence or phase balanced voltage relay. A relay that operates when the multiphase voltage is unbalanced or the negative sequence voltage exceeds a predetermined value under a predetermined value of the specified phase sequence multiphase voltage.
48--incomplete sequence relay
The operation sequence is not complete relay. If the normal start-up or shutdown sequence is not properly completed within a predetermined time, it will return the device to its original or disconnected position and lock it.
49--machine or transformer thermal relay
Temperature relay for the motor or transformer. A relay that operates when the temperature of the armature of the motor and other energized coil components, or the temperature of the component of the motor or power transformer exceeds a predetermined value.
50--instantaneous overcurrent relay
Instantaneous overcurrent relay. An element that operates without an internal delay when the current exceeds a predetermined value.
51--ac time overcurrent relay
The AC time-limited overcurrent relay is a relay with a timing inverse time characteristic that operates when the AC loop current exceeds a predetermined value.
52--ac circuit breaker
AC circuit breaker. A component used to open and close an AC power circuit under normal conditions, or to disconnect a power circuit in the event of a fault.
53--exciter or dc generator relay
Exciter or DC generator relay. A relay that causes excitation to occur when the generator is started or when the motor voltage has been established and reaches a certain value.
54--turning gear engaging device
The turning device engages the component. An element that can be electrically operated, controlled, or monitored to engage or disengage the turning device from the motor shaft.
55--power factor relay
Power factor relay. A relay that operates in an AC circuit when the power factor is above or below a given value.
56--field application relay
Excitation relay. A relay that automatically controls the AC motor exciter at a predetermined point on the slip curve.
57--short-circuiting or grounding device
Short circuit or grounding element. A primary circuit switching element that reflects an automatic or manual method of shorting or grounding a loop.
58--rectification failure relay
Rectifier fault relay. The power rectifier does not properly trigger components that operate when turned on or latched.
59--overvoltage relay
Overvoltage relay. A relay that operates when the input voltage exceeds a given value.
60--voltage or current balance relay
Voltage or current balancing relay. A relay that operates between a voltage or current input and output difference between two circuits that exceeds a given value.
61--density swith or sensor
Density switch or probe. An element that acts when a rate of change in density or density reaches a given value.
62--time-delay stopping or openning relay
The time-delayed shutdown or start-up relay is a time-delay relay that works in conjunction with the startup components of shutdown, shutdown, and startup in an automatic sequence or protection relay system.
63--pressure switch
Pressure Switch. Acts when the rate of change of pressure or pressure reaches a given value.
64--ground detector relay
Ground detection relay. A relay that operates when a motor or other device has a ground-to-ground insulation failure.
Note: This function is not applicable to components connected to the secondary circuit of the current transformer in the neutral grounded power system. In this case, the overcurrent component can be represented by the suffix G or N. For example, 51N is located in the secondary of the current transformer. The AC time limit overcurrent relay of the point.
Governor. A control device that is combined hydraulically, electrically, or mechanically to regulate the flow of water, steam, or other medium to the prime mover for prime mover start, maintenance speed, or load or shutdown purposes.
66--notching or jogging device
The function of the multi-stage starter element is to allow only one device or device to operate for a specified number of actions, or to allow the device to operate continuously with each other for a specified number of times. In addition, it can also excite a circuit periodically or at a specified interval time. It can also be used to intermittently or repeatedly start the motor at low speeds for mechanical position adjustment.
67--ac directional over current relay
AC direction overcurrent relay. A relay that operates under a given current in a predetermined direction.
68--blocking or out-of-step relay
Blocking or out of step relay. Under predetermined conditions, when an external fault occurs in the transmission line or other equipment, a trip command is issued, or the tripping and reclosing circuit is blocked with other components in the case of out-of-step conditions and power swing.
69--permissive control device
License control component. There are typically two positions, one of which allows the circuit breaker to be closed or the device to be put into operation, while in another position the circuit breaker or device is prevented from being operated.
A varistor is a component whose resistance changes. In the electrical circuit, it is electrically operated or has other electrical accessories such as auxiliary switches, position switches, limit switches.
71--level switch
Level switch. Acts when the liquid level or level change rate reaches a given value.
72--dc circuit breaker
DC circuit breaker. Used as a DC-on/off circuit in normal operating conditions, or in the event of a fault emergency.
73--load-resistor contactor
Load resistance contactor. It can be used to string in or bypass the primary load current limiting resistor, shunt resistor or load display resistor in the power circuit. It can also be used in the circuit to switch the heater, the illuminator and the regenerative load resistor of the switching power rectifier or other motor.
74--alarm relay
Alarm relay. Unlike the signal relay numbered 30, it is used to operate an audiovisual alarm.
75--position changing mechanism
Position change mechanism. A mechanism for moving a main component of a device from one location to another, such as changing the input position, evacuation position, and test position of a movable breaker unit.
76--dc overcurrent relay
DC overcurrent relay, a relay that operates in a DC loop when the current exceeds a given value.
77--telemetering device
Telemetry component. When used as a transmitter, it is converted into an electrical signal that is transmitted to a remote location. When used as a receiver, the received electrical signal is converted to the original measured.
78--phase-angle measuring relay
Phase angle measurement relay. A relay that operates between predetermined phase angles between two voltages, two currents, or a current and voltage.
79--reclosing relay
Reclosing relay. It is a relay that controls the automatic reclosing and blocking of the AC circuit breaker.
80--flow switch
Flow Switch. A switch that operates under a given flow rate or flow rate of change.
81--frequency relay
Frequency relay. Acts when the frequency or frequency change rate of the electrical quantity reaches a predetermined value.
82--dc load-measuring reclosing relay
DC reclosing relay. A relay that controls the automatic closing or reclosing of a DC breaker is usually related to the operation of the load circuit.
83--automatic selective control or transfer realy
Automatically select control or switching relays. A relay that automatically selects between certain power supplies or operating conditions of a device, or that automatically performs a conversion operation.
84--operating mechanism
Operating mechanism. It is a complete electrical or servo mechanism that includes an operating motor, operating coils, position switches, etc. It can be used to operate tap-changers with component numbering, inductive regulators or any similar device.
85--carrier or pilot-wire realy
Carrier or pilot line relay. A relay that is operated or controlled by a signal transmitted or received by a communication medium for relay protection.
86--lockout relay
Blocking relay. Trip the device or component and keep it locked until the operator returns to the local or remote location.
87--differential protective relay
Differential protection relay. In the comparison of two currents or other quantities, it acts when there is a difference in its percentage, phase angle or other quantity.
88--auxiliary motor or motor generator
Auxiliary motor or motor generator set. It is an element used to operate auxiliary equipment such as pumps, blowers, exciters, and rotary electromagnetic amplifiers.
89--line switch
Line switch. Used as a load switch, or as an isolating switch for AC and DC power lines. (This function number is only used when the switch is electrically operated or has an auxiliary switch, electromagnetic lock, etc.)
90--regulating device
Adjustment element. A function that adjusts one or more quantities of voltage, current, frequency, speed, rate, temperature, or load between a given value or a given limit of a motor tie line or other device.
91--voltage directional relay
Voltage direction relay. A relay that operates when the voltage across the open circuit breaker or contactor exceeds a given value and coincides with a given direction.
92--voltage and power directional relay
Voltage and power direction relays. When the voltage difference between the two loops exceeds a given value and coincides with a predetermined direction, the two loops are allowed or juxtaposed, and when the power flow between the two loops exceeds a given value in the opposite direction, this is made A relay in which two circuits are disconnected from each other.
93--field-changing contactor
Magnetic field change contactor. A component that performs a stepwise lifting operation on the excitation value of a generator.
94--tripping or trip-free relay
Trip or auto trip relay. The function is to trip the circuit breaker, contactor or equipment, or to allow immediate tripping by other components, and to prevent the circuit breaker from reclosing immediately after the trip. Even if the closing circuit of the circuit breaker remains closed, it should automatically disconnect.
Dedicated for each individually installed device that is not functionally assigned to function numbers 1 through 94.
Component numbering method for more than one function. When a component can perform two more important functions in one device, it is necessary to explain both functions, which can be done by dual function numbering and name. For example 50/51, instantaneous and time-limited overcurrent relays.
Suffix number. In the same device, if two or more components have the same function number and suffix letter, they can be distinguished by the suffix numbering method. For example 52X-1, 52X-2, 52X-3.
Suffix letters. The suffix letters can be used with the component function number according to the different purpose of use.
The authenticity of this information has not been confirmed by the international electrical network, for your reference only.

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