A phase comparison method for three-phase phase sequence
By automatically detecting and controlling the voltage difference at the terminals using an air switch device, the safety hazards associated with manual phase matching in existing technologies are resolved, accurate three-phase sequence wiring is achieved, and the safety of the power system is improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- STATE GRID ZHEJIANG ELECTRIC POWER CO LTD SHAOXING POWER SUPPLY CO
- Filing Date
- 2023-03-14
- Publication Date
- 2026-06-23
AI Technical Summary
Existing phase comparators pose a safety hazard due to human error during wiring, and the phase comparator results may be inaccurate, leading to potential safety risks in the power system.
An air switch device is used, which includes a main controller, upper and lower terminals, an operating switch, a voltage difference regulator and a lockout. The voltage difference is detected by a voltage detector and the phase sequence is determined by the main controller, which automatically controls the closing or opening of the operating switch to prevent incorrect wiring.
It improves the safety of wiring, avoids wiring errors caused by human negligence, ensures accurate phase sequence, and enhances the safety of the power system.
Smart Images
Figure CN116504593B_ABST
Abstract
Description
[Technical Field]
[0001] This invention demonstrates a phase sequence verification method for three-phase circuits, belonging to the field of air switch technology. [Background Technology]
[0002] Phase sequence verification refers to the approval of the phase sequence of two power sources or loops in a power system to ensure that the three-phase sequence of the entire system is consistent. Incorrect phase sequence is extremely dangerous; parallel operation can cause severe short circuits, burn out transformers, and result in serious consequences such as motor reversal, electrical damage, and meter malfunction. Therefore, phase sequence verification must be performed after the completion of any work involving the construction, reconstruction, expansion, or alteration of lines and substations.
[0003] The phase sequence analyzer in the existing technology is only used to check the three-phase sequence. After the phase sequence is checked, manual wiring is required. There is still a possibility of incorrect wiring during the wiring process. In addition, during manual operation, there is also a possibility that the phase sequence result is incorrect and wiring is still performed due to human negligence, which poses certain safety hazards. [Summary of the Invention]
[0004] The purpose of this invention is to solve the safety hazards existing in the current phase sequence matching process. To this end, a phase sequence matching method for three-phase phase sequence is provided, which can improve the safety of wiring.
[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0006] A phase sequence verification method for three-phase phases, characterized in that it includes an air switch, which has a main controller, an upper terminal, a lower terminal, an operating switch, a voltage differential regulator, and a latch. Both the upper and lower terminals have three terminals, each connected to a voltage detector. The operating switch includes a closed position that keeps the upper and lower terminals connected and an open position that keeps them disconnected. The phase sequence verification method includes:
[0007] S1. The voltage detector detects the voltage value of each terminal and transmits it to the main controller. The main controller calculates the voltage difference between two terminals of the same phase sequence.
[0008] S2. When the voltage difference between the three phases is less than 3V, the main controller determines that the phase sequence of the three phases is accurate, and the operating switch can move from the open position to the closed position.
[0009] S3. When there is voltage at each terminal, the voltage difference of the three phases is compared with the voltage difference setting value preset by the voltage difference regulator. When the voltage difference of the three phases is less than the voltage difference setting value, the main controller determines that the phase sequence of the three phases is accurate, and the operating switch can move from the open position to the closed position. When one of the voltage differences of the three phases is greater than the voltage difference setting value, the main controller determines that the phase sequence of the three phases is incorrect, and the interlocking device restricts the operating switch to the open position.
[0010] S4. When there is no voltage at the three terminals of the lower terminal and the voltage values of the three terminals of the upper terminal are all greater than 55V, the main controller determines that the phase sequence of the three phases is accurate, and the operating switch can move from the open position to the closed position.
[0011] S5. When there is no voltage at all three terminals of the lower terminal and the voltage value of one or two terminals of the upper terminal is less than 3V, the main controller judges that the circuit is loose or broken, and the interlocker restricts the operation switch to the open position.
[0012] The beneficial effects of using the present invention are:
[0013] In this invention, the circuits are connected to the upper and lower terminals respectively. The main controller inside the air switch detects the phase sequence. When the main controller detects that the phase sequence is correct, the locking lever is in the active position. At this time, the operating switch is active, and the operator can directly operate the switch from the open position to the closed position. At this time, the upper and lower terminals are connected. In this invention, when the main controller determines that the three-phase sequence is correct, the operator can directly connect the upper and lower terminals, eliminating the need for wiring and avoiding wiring errors caused by human negligence, thereby improving the safety of the operator during the wiring process. In addition, when the main controller detects that the phase sequence is incorrect or determines that the circuit is broken, the locking device restricts the operating switch to the open position, preventing the operator from moving the operating switch to the closed position. The locking lever can prevent the operating switch from connecting the upper and lower terminals when the phase sequence is incorrect, thereby further improving the safety of this invention.
[0014] Preferably, before wiring, the air switch should be moved to the off position.
[0015] Preferably, the voltage difference setting value is set by the voltage difference regulator before wiring the air switch.
[0016] Preferably, the air switch has an indicator area equipped with an enable indicator, a lockout indicator, and an alarm indicator. When the main controller determines the phase sequence is correct, the enable indicator lights up; when the main controller determines the phase sequence is incorrect, the lockout indicator lights up; and when the main controller determines the circuit is loosely connected or open, the alarm indicator lights up. Using the aforementioned technical solution, the indicator area provides users with more intuitive results, allowing staff to directly and quickly understand the main controller's judgment.
[0017] Preferably, the locking device includes a locking base and a locking rod movably mounted on the locking base, the locking rod including a locking position that restricts the movement of the operating switch and an active position away from the operating switch.
[0018] Preferably, the operating switch is provided with a limiting hole for the locking rod to extend into, and the limiting hole is aligned with the locking rod when the operating switch is in the locked position. Using the aforementioned technical solution, when the locking rod is in the locked position, the locking rod extends directly into the limiting hole. Through the cooperation of the locking rod and the limiting hole, the movement of the operating switch can be effectively restricted, preventing the operating switch from moving when the phase sequence is incorrect.
[0019] Preferably, the locking lever is positioned between the open and closed positions of the operating switch, and when the locking lever is in the locked position, it restricts the movement of the operating switch towards the closed position. By adopting the aforementioned technical solution, direct contact between the locking lever and the operating switch can be reduced, decreasing the possibility of damage to both and increasing their service life.
[0020] Preferably, the air switch includes a housing with a groove for sliding the operating switch, and the operating switch is slidably installed in the groove.
[0021] Preferably, the air switch includes a housing, and a rotating shaft and a shaft hole are provided between the housing and the operating switch, and the operating switch is rotatably connected through the rotating shaft and the shaft hole.
[0022] Preferably, the locking base is equipped with an electromagnetic actuator, the locking rod is equipped with a magnet, and an elastic element is sleeved on the locking rod to cause it to move away from the electromagnetic actuator. When the electromagnetic actuator is energized, it moves the locking rod to the active position; when the electromagnetic actuator is de-energized, the elastic element moves the locking rod to the locked position. Using the aforementioned technical solution, when the air switch malfunctions or loses power, the locking rod can restrict the operating switch to the open position, preventing the possibility of accidental connection by personnel due to air switch failure.
[0023] Other features and advantages of the present invention will be disclosed in detail in the following detailed description and accompanying drawings. [Attached Image Description]
[0024] The invention will be further described below with reference to the accompanying drawings:
[0025] Figure 1 This is a simplified structural diagram of an air switch in a phase sequence verification method for three-phase phases according to the present invention.
[0026] Figure 2 This is a simplified flowchart of a phase identification method for three-phase sequence according to the present invention.
[0027] Reference numerals: 1 housing, 11 indicator area, 111 enable indicator, 112 lock indicator, 113 alarm indicator, 12 voltage difference regulator, 21 upper terminal, 211 first upper end, 212 second upper end, 213 third upper end, 22 lower terminal, 221 first lower end, 222 second lower end, 223 third lower end, 31 operating switch, 32 locker, 321 lock lever.
Detailed Implementation Methods
[0028] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.
[0029] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise expressly defined.
[0031] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0032] like Figure 1 As shown in the figure, this embodiment illustrates a phase sequence verification method for three-phase circuits, including an air switch. The air switch includes a housing 1, on which an upper terminal 21, a lower terminal 22, and an operating switch 31 movably connected are provided. The operating switch 31 includes a closed position that keeps the upper terminal 21 and the lower terminal 22 connected and an open position that keeps the upper terminal 21 and the lower terminal 22 disconnected. A main controller for determining whether the phase sequence is accurate is provided inside the housing 1. A locker 32 is provided on one side of the operating switch 31. The locker 32 includes a lock base and a lock rod 321 movably mounted on the lock base. The lock rod 321 includes a locked position that restricts the movement of the operating switch 31 and an open position that moves away from the operating switch 31. When the main controller determines that the phase sequence is accurate, the lock rod 321 is in the open position; when the main controller determines that the phase sequence is incorrect, the lock rod 321 is in the locked position and restricts the operating switch 31 to the open position.
[0033] In this embodiment, the lines are respectively connected to the upper terminal 21 and the lower terminal 22. The main controller inside the housing 1 is used to detect the phase sequence result. When the main controller detects that the phase sequence is correct, the locking lever 321 is in the active position. At this time, the operating switch 31 is in the active state, and the operator can directly operate the switch 31 from the open position to the closed position. At this time, the upper terminal 21 and the lower terminal 22 are connected. In this embodiment, when the main controller determines that the phase sequence of the three phases is correct, the operator can directly connect the upper terminal 21 and the lower terminal 22. This eliminates the need for workers to connect wires, preventing wiring errors caused by human negligence and thus improving worker safety during wiring. Furthermore, when the main controller detects an incorrect phase sequence, the locking lever 321 is in the locked position, restricting the operating switch 31 to the open position. Workers cannot move the operating switch 31 to the closed position. The locking lever 321 prevents the operating switch 31 from connecting the upper terminal 21 and the lower terminal 22 when the phase sequence is incorrect, further enhancing the safety of this embodiment.
[0034] In this embodiment, the housing 1 is provided with a rotating shaft, and the operating switch 31 is provided with a shaft hole that rotatably cooperates with the rotating shaft. The operating switch 31 is rotatably connected through the rotating shaft and the shaft hole. Of course, it can be understood that in other embodiments, the rotating shaft may also be provided on the operating switch 31, and the corresponding shaft hole may be provided on the housing 1.
[0035] It should be noted that in other embodiments, the housing 1 may also be provided with a sliding groove for the operation switch 31 to slide, and the operation switch 31 is slidably installed in the sliding groove.
[0036] In this embodiment, the operating switch 31 is provided with a limiting hole for the locking rod 321 to extend into. When the operating switch 31 is in the locked position, the limiting hole is aligned with the locking rod 321. When the locking rod 321 is in the locked position, the locking rod 321 extends directly into the limiting hole. Through the cooperation of the locking rod 321 and the limiting hole, the movement of the operating switch 31 can be effectively restricted, preventing the operating switch 31 from moving when the phase sequence is incorrect.
[0037] It is understandable that in other embodiments, the locking rod 321 may also be positioned between the open and closed positions of the operating switch 31. When the locking rod 321 is in the locked position, it restricts the movement of the operating switch 31 to the closed position, which can reduce the direct contact between the locking rod 321 and the operating switch 31, reduce the possibility of damage to the locking rod 321 and the operating switch 31, and improve the service life of the locking rod 321 and the operating switch 31.
[0038] In this embodiment, the locking device 32 includes a locking base and a locking rod 321. The locking base is provided with an electromagnetic actuation part, and the end of the locking rod 321 facing the electromagnetic actuation part is provided with a magnet. An elastic element is sleeved on the locking rod 321 to make the locking rod 321 tend to move away from the electromagnetic actuation part. When the electromagnetic actuation part is energized, the electromagnetic actuation part generates magnetism and attracts the magnet on the locking rod 321, thereby causing the locking rod 321 to disengage from the operating switch 31 and move to the active position. When the electromagnetic actuation part is de-energized, the electromagnetic actuation part loses magnetism, and the locking rod 321 extends into the limiting hole of the operating switch 31 under the action of the elastic element, thereby moving to the locked position.
[0039] In this embodiment, the surface of the housing 1 is provided with an indicator area 11, in which an enable indicator light 111, a lock indicator light 112, and an alarm indicator light 113 are installed. The judgment result of the main controller includes phase sequence accuracy, phase sequence error, and circuit disconnection. When the main controller judges that the phase sequence is accurate, the enable indicator light 111 lights up; when the main controller judges that the phase sequence is incorrect, the lock indicator light 112 lights up. The indicator area 11 can provide users with more intuitive results, enabling staff to directly and quickly understand the judgment result of the main controller; when the main controller judges that the circuit is disconnected, the alarm indicator light 113 lights up.
[0040] In this embodiment, the housing 1 is provided with a voltage difference adjustment component 12 connected to the main controller. The voltage difference adjustment component 12 is used to adjust and set the voltage difference setting value. The voltage difference setting value can be directly changed through the voltage difference adjustment component 12, making the phase sequence calibration more flexible for the staff.
[0041] In this embodiment, both the upper terminal 21 and the lower terminal 22 are provided with three terminals. Each terminal is connected to a voltage detector. The voltage detector is connected to the main controller and transmits the detected voltage to the main controller. The upper terminal 21 includes a first upper terminal 211, a second upper terminal 212, and a third upper terminal 213. The lower terminal 22 includes a first lower terminal 221, a second lower terminal 222, and a third lower terminal 223.
[0042] like Figure 2 As shown, the nucleation process in this embodiment is as follows:
[0043] First, adjust the operating switch 31 to the off position, connect the wiring to the upper terminal 21 and lower terminal 22 of the housing 1, and simultaneously, the operator sets the voltage difference setting value through the voltage difference regulator 12, which is then transmitted to the main controller and denoted as U. e At this time, the voltage detector detects the voltage of each terminal and transmits the detection result to the main controller. The main controller records the voltage value of each terminal and calculates the voltage value between the upper terminal 21 and the lower terminal 22, that is, the voltage difference between the first upper terminal 211 and the first lower terminal 221 is denoted as U. Aa The voltage difference between the second upper end 212 and the second lower end 222 is denoted as U. Bb The voltage difference between the third upper terminal 213 and the third lower terminal 223 is denoted as U. Cc .
[0044] When U Aa U Bb and U Cc When both are less than 3V, the main controller determines that the phase sequence of the upper terminal 21 and the lower terminal 22 is accurate, and at the same time controls the enable indicator light 111 to light up. The locker 32 controls the lock rod 321 to disengage from the operating switch 31, so that the lock rod 321 is in the active position. At this time, the operating switch 31 is in the active state.
[0045] When there is voltage at each terminal, U Aa U Bb and U Cc These three voltage differences are respectively related to the voltage difference set value U e For comparison, when U Aa U Bb and U Cc All less than U eWhen the main controller determines that the phase sequence of the upper terminal 21 and the lower terminal 22 is accurate, it controls the enable indicator light 111 to light up. The locking device 32 controls the locking rod 321 to disengage from the operating switch 31, so that the locking rod 321 is in the active position. At this time, the operating switch 31 is in the active state.
[0046] When U Aa U Bb and U Cc One of them is greater than U e When the main controller determines that the phase sequence of the upper terminal 21 and the lower terminal 22 is incorrect, it controls the interlock indicator light 112 to light up, and the interlocker 32 controls the interlocking rod 321 to extend into the limit hole of the operating switch 31, so that the interlocking rod 321 is in the interlocked position and the operating switch 31 is restricted to the open position.
[0047] When there is no voltage at the three terminals of the lower terminal 22, the main controller judges the voltage value of the three terminals of the upper terminal 21. When the voltage value of the three terminals of the upper terminal 21 is greater than 55V, the main controller judges that the phase sequence of the upper terminal 21 and the lower terminal 22 is accurate, and at the same time controls the enable indicator light 111 to light up. The locker 32 controls the lock rod 321 to disengage from the operating switch 31, so that the lock rod 321 is in the active position. At this time, the operating switch 31 is in the active state.
[0048] When the voltage value of one or two of the three terminals of the upper terminal 21 is less than 3V, the main controller determines that there is a problem of loose connection or open circuit in the circuit. At the same time, it controls the interlock indicator light 112 to light up, and the interlocker 32 controls the interlocking rod 321 to extend into the limit hole of the operating switch 31, so that the interlocking rod 321 is in the interlocked position and the operating switch 31 is restricted to the open position.
[0049] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of the present invention will be included within the scope of the claims.
Claims
1. A phase sequence verification method for three-phase sequences, characterized in that: The device includes an air switch, which has a main controller, an upper terminal, a lower terminal, an operating switch, a voltage differential regulator, and a lockout. Both the upper and lower terminals have three terminals, each connected to a voltage detector. The operating switch includes a closed position that keeps the upper and lower terminals connected and an open position that keeps them disconnected. The lockout includes a locking base and a locking rod movably mounted on the locking base. The locking rod includes a locked position that restricts the movement of the operating switch and an open position away from the operating switch. The locking base has an electromagnetic actuator, the locking rod has a magnet, and the locking rod is fitted with an elastic element that causes it to move away from the electromagnetic actuator. When the electromagnetic actuator is energized, it moves the locking rod to the open position. When the electromagnetic actuator is de-energized, the elastic element causes the locking rod to move to the locked position. The phase comparison method includes: S1. The voltage detector detects the voltage value of each terminal and transmits it to the main controller. The main controller calculates the voltage difference between two terminals of the same phase sequence. S2. When the voltage difference between the three phases is less than 3V, the main controller determines that the phase sequence of the three phases is accurate, and the operating switch can move from the open position to the closed position. S3. When there is voltage at each terminal, the voltage difference of the three phases is compared with the voltage difference setting value preset by the voltage difference regulator. When the voltage difference of the three phases is less than the voltage difference setting value, the main controller determines that the phase sequence of the three phases is accurate, and the operating switch can move from the open position to the closed position. When one of the voltage differences of the three phases is greater than the voltage difference setting value, the main controller determines that the phase sequence of the three phases is incorrect, and the interlocking device restricts the operating switch to the open position. S4. When there is no voltage at the three terminals of the lower terminal and the voltage values of the three terminals of the upper terminal are all greater than 55V, the main controller determines that the phase sequence of the three phases is accurate, and the operating switch can move from the open position to the closed position. S5. When there is no voltage at all three terminals of the lower terminal and the voltage value of one or two terminals of the upper terminal is less than 3V, the main controller judges that the circuit is loose or broken, and the interlocker restricts the operation switch to the open position.
2. The phase identification method for three-phase sequence according to claim 1, characterized in that: Before wiring, the air switch should be moved to the off position.
3. The phase identification method for three-phase sequence according to claim 1, characterized in that: Before wiring, the voltage difference setting value of the air switch is set by the voltage difference regulator.
4. The phase sequence verification method for three-phase sequence according to claim 1, characterized in that: The air switch is equipped with an indicator area, which contains an enable indicator light, a lock indicator light, and an alarm indicator light. When the main controller determines that the phase sequence is correct, the enable indicator light illuminates; when the main controller determines that the phase sequence is incorrect, the lock indicator light illuminates; and when the main controller determines that the circuit is loosely connected or disconnected, the alarm indicator light illuminates.
5. The phase identification method for three-phase sequence according to claim 1, characterized in that: The operating switch is provided with a limiting hole for the locking rod to extend into, and the limiting hole is aligned with the locking rod when the operating switch is in the locked position.
6. The phase identification method for three-phase sequence according to claim 1, characterized in that: The locking lever is positioned between the open and closed positions of the operating switch. When the locking lever is in the locked position, it restricts the operating switch from moving to the closed position.
7. A phase identification method for a three-phase sequence according to claim 5 or 6, characterized in that: The air switch includes a housing, and the housing has a slide groove for the operating switch to slide in. The operating switch is slidably installed in the slide groove.
8. A phase sequence verification method for three-phase sequences according to claim 5 or 6, characterized in that: The air switch includes a housing, and a rotating shaft and a shaft hole are provided between the housing and the operating switch. The operating switch is rotatably connected through the rotating shaft and the shaft hole.