1. Operation of mechanical switch appliances
The moving parts of electrical appliances (such as moving contacts) transition from one position to another.
Note: 1 For example, for circuit breakers, the operation can be either a closed operation or an open operation.
If it is necessary to distinguish, it can be divided into electrical operations, such as making or breaking, called on/off operations. Mechanical operations, such as closing or opening, are called mechanical operations.
2 (Operation cycle of mechanical switch appliances)
The continuous operation of transitioning from one position to another and then returning to the starting position. If there are multiple positions, it is necessary to pass through all other positions.
3 (Operation sequence of mechanical switch appliances)
Complete the specified continuous operations within the specified time interval.
4 Manpower Control
Control with human involvement in operations.
5 Automatic control
Control that operates according to predetermined conditions without anyone participating.
6 Local control
Control of operation on or near the controlled switching device.
7 Remote control
Control operated far away from the controlled switching device.
8 (Closing operation of mechanical switch appliances)
The operation of switching electrical appliances from the open position to the closed position.
9 (Mechanical switch electrical equipment) disconnection operation
The operation of switching electrical appliances from the closed position to the open position.
10 (Definite disconnection operation of mechanical switch appliances)
According to the prescribed requirements, when the position of the actuator corresponds to the disconnection position of the switching device, the disconnection operation can ensure that all main contacts are in the disconnected position.
11 Positive Drive Operation
According to the prescribed requirements, the operation is used to ensure that each auxiliary contact of the mechanical switch electrical appliance is in the relative position corresponding to the main contact opening or closing.
12 (related to manual operation of mechanical switch appliances)
A type of operation that relies entirely on the direct application of human labor, and the speed and force of the operation depend on the operator's actions.
13 (Power operation related to mechanical switch appliances)
An operation performed using energy other than human labor, and the completion of the operation depends on the continuity of energy supply (such as solenoids, electric motors, or pneumatic machinery).
14 (Energy storage operation of mechanical switch appliances)
The operation is carried out using the energy stored in the mechanism itself before the operation and sufficient to complete the operation under predetermined conditions.
Note: Energy storage operations can be divided into:
1. Energy storage methods (springs, gravity, etc.);
2. Sources of energy (manpower, electricity, etc.);
3. Energy release methods (manpower, electricity, etc.).
15 (Non manual operation of mechanical switch appliances)
Energy comes from human labor and is a type of energy storage operation that stores or releases energy during a continuous operation, with the force and speed of the operation independent of the operator's actions.
16 (unrelated power operation of mechanical switch appliances)
The stored energy comes from an external power source and is released during a continuous operation. The force and speed of the operation are independent of the operator's actions.
17 Operating force (torque)
The force (torque) that needs to be applied to the actuator to complete the predetermined operation.
18 restoring force (torque)
The force (torque) required to return the actuator or contact element to its initial position.
19 (stroke of mechanical switch appliances or their components)
The displacement (translation or rotation) of a point on a moving component.
Note: There is a difference between pre stroke and over stroke.
20 (closed position of mechanical switchgear)
Ensure that the contacts in the main circuit of the electrical appliance are in the predetermined energized position.
21 (disconnect position of mechanical switch appliances)
Ensure that the main circuit of the electrical appliance meets the predetermined dielectric withstand voltage requirements between the disconnected contacts.
Note: The above definition is different from the requirement of IEV441-16-23 to meet the dielectric performance requirements.
22 trip (operation)
The disconnection operation of mechanical switch appliances caused by circuit breakers or releases.
23 mechanical switch appliances with free release
After the start of the closing operation, even if the closing command is still held, only when the opening (tripping) operation begins, its moving contact can return and remain in the open position as a mechanical switching device.
Note: 1 To ensure the normal disconnection of potentially connected currents, it is necessary to instantaneously reach the closed position of the contacts;
2. Due to the automatic control of the free release mechanical switch electrical appliances.
24 instantaneous relay or release
No relay or release that is delayed by anyone.
2.4.25 Overcurrent relay or release
A relay or release that causes mechanical switching devices to operate with or without delay when the current of the relay or release exceeds a predetermined value.
Note: In some cases, the predetermined value depends on the rate of current rise.
26 timed overcurrent relay or release
An overcurrent relay or release that operates after a certain delay can have an adjustable delay time, but is not affected by the current value.
27 inverse time overcurrent relay or release
An overcurrent relay or release that operates after a certain delay time is inversely proportional to the passing overcurrent.
Note: The above relays or releases should be designed to approach a determined minimum value at high overcurrent.
28 Direct overcurrent relay or release
An overcurrent relay or release that is directly excited by the main circuit current of a switching device.
29 Indirect overcurrent relay or release
An overcurrent relay or release that is excited by the main circuit current of a mechanical switching device through a current transformer or shunt.
30 overload relay or release
An overcurrent relay or release used for overload protection.
31 Thermal overload relay or release
A relay or release that operates in reverse time (including delay) depending on the thermal effect generated by the current flowing through the relay or release.
3.2 Electromagnetic Overload Relay or Release
An overload relay or release that operates by utilizing the force generated by the current flowing through the main circuit and exciting the electromagnetic coil.
Note: The above relays or releases typically have inverse time/current characteristics.
33 shunt release
A release excited by a voltage source.
Note: The voltage source can be independent of the main circuit voltage.
34 Undervoltage relay or release
When the terminal voltage of a relay or release drops to a predetermined value, a relay or release that causes mechanical switching devices to open or close with or without delay.
35 reverse current relay or release (DC only)
A relay or release in a DC circuit that causes mechanical switching devices to open with or without delay when the direction of current changes and exceeds a predetermined value.
36 (operating current of overcurrent relay or release)
The current value at which a relay or release can operate when the current is equal to or greater than this value.
37 (overcurrent or overload relay or release) current setting value
The main circuit current value related to the operating characteristics of a relay or release and used to determine the action of the relay or release.
Note: A relay or release can have more than one current setting value, which can be determined by adjustable dials, replaceable heaters, and other methods.
38 (overcurrent or overload relay or release) current setting range
The range between the maximum and minimum values of adjustable relay or release current settings.