Novel power supply monitoring loop
By designing a new power monitoring circuit, the frequent tripping problems caused by insufficient power supply reliability and unbalanced load of the mobile oil filter are solved, ensuring the correct wiring phase sequence and avoiding tripping caused by power disturbance, achieving stable operation of the oil filter .
Patent Information
- Application Number
- CN202420967817.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-07
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-07
AI Technical Summary
In the prior art, the power supply of the mobile oil filter is taken from the maintenance power supply box, and the reliability of the maintenance power supply is insufficient. Single-phase load causes load imbalance, and frequent power disturbances cause the phase sequence protector to operate, resulting in frequent tripping of the oil filter.
A new power monitoring circuit is designed, including a phase sequence protector, a mobile oil filter, a start switch, a second AC contactor, a stop switch, a third AC contactor and a main contactor of the oil pump motor, through parallel connection and connection of these components , ensure that the wiring phase sequence is correct, and short-circuit the normally open point of the third AC contactor to avoid tripping caused by power disturbance.
It effectively solves the problems of phase sequence errors and frequent tripping of the oil filter connection, ensures the normal operation of the oil filter, and improves the reliability of the phase sequence protector, avoiding tripping caused by power disturbance.
Smart Images
Figure CN222262171U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of monitoring circuits, in particular to a novel power supply monitoring circuit. Background Art
[0002] The lubricating oil and EH oil of the large and small units of the unit are equipped with mobile oil filters to assist in oil filtering. The brand of the mobile oil filters is Puruiqi or PALL. A phase sequence protector is installed in its control cabinet. The auxiliary normally open point (TA / TC) of the phase sequence protector is connected in series in the closing circuit of the oil pump of the oil filter. When the phase sequence of the motor power connection is wrong, the TA / TC point is disconnected and the oil pump cannot be started to prevent the oil pump from reversing and damaging the equipment due to the phase sequence error.
[0003] However, in the prior art, since the power supply of the mobile oil filter is taken from the maintenance power box, the maintenance power supply has problems such as insufficient reliability and load imbalance caused by single-phase load. Many power disturbance factors can easily cause the phase sequence protector of the mobile oil filter to operate, resulting in frequent tripping of the oil filter. Utility Model Content
[0004] The purpose of the utility model is to solve the problems existing in the prior art that the power supply of the mobile oil filter is taken from the maintenance power supply box, the maintenance power supply has insufficient reliability, and the single-phase load causes load imbalance, and the power supply disturbance factors are prone to cause the mobile oil filter phase sequence protector to operate, resulting in frequent tripping of the oil filter, and a new power supply monitoring circuit is proposed.
[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a new power supply monitoring circuit, including a phase sequence protector, a mobile oil filter, a start switch, a second AC contactor, a stop switch, a third AC contactor and an oil pump motor main contactor, the Ta and Tc ends of the phase sequence protector are connected in parallel with the two ends of the third AC contactor, one end of the third AC contactor is connected to the oil pump motor main contactor, the other end of the third AC contactor is connected to one end of the stop switch, the start switch is connected in parallel with the second AC contactor, and one end of the second AC contactor is connected to the other end of the stop switch.
[0006] Preferably, the input end of the mobile oil filter is connected to a first AC contactor, and one end of the first AC contactor is connected to a switch.
[0007] Preferably, the first AC contactor and the switch are connected in parallel with the phase sequence protector.
[0008] Preferably, one end of the switch is connected to a fuse.
[0009] Compared with the prior art, the advantages and positive effects of the utility model are:
[0010] In the utility model, by technically modifying the phase sequence protector circuit of the mobile oil filter, the correct phase sequence of the oil filter connection can be ensured, and the defect of frequent tripping of the mobile oil filter can be effectively solved. Moreover, the fixed oil purification device equipped with the phase sequence protector can also be modified according to this scheme. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 A circuit schematic diagram of a novel power supply monitoring circuit is proposed for the utility model.
[0012] Legend: 1. Phase sequence protector; 2. Fuse; 3. Switch; 4. First AC contactor; 5. Mobile oil filter; 6. Start switch; 7. Second AC contactor; 8. Stop switch; 9. Third AC contactor; 10. Oil pump motor main contactor. DETAILED DESCRIPTION
[0013] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.
[0014] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure. Embodiment 1
[0015] like Figure 1 As shown, the utility model provides a novel power supply monitoring circuit, including a phase sequence protector 1, a mobile oil filter 5, a start switch 6, a second AC contactor 7, a stop switch 8, a third AC contactor 9 and an oil pump motor main contactor 10, the Ta and Tc ends of the phase sequence protector 1 are connected in parallel with the two ends of the third AC contactor 9, one end of the third AC contactor 9 is connected to the oil pump motor main contactor 10, the other end of the third AC contactor 9 is connected to one end of the stop switch 8, the start switch 6 is connected in parallel with the second AC contactor 7, one end of the second AC contactor 7 is connected to the other end of the stop switch 8, the input end of the mobile oil filter 5 is connected to the first AC contactor 4, one end of the first AC contactor 4 is connected to the switch 3, the first AC contactor 4 and the switch 3 are connected in parallel with the phase sequence protector 1, and one end of the switch 3 is connected to the fuse 2.
[0016] The specific settings and functions of this embodiment are described in detail below. The third AC contactor 9 is connected in parallel with the auxiliary contact NO point Ta / Tc point of the phase sequence protector 1. When the mobile oil filter 5 is connected, the main contactor of the oil pump motor main contactor 10 is not energized. The correctness of the wiring phase sequence can be confirmed by observing the indicator light of the phase sequence protector 1. If the phase sequence is wrong, the oil pump motor cannot be started. When the phase sequence is correct and the oil filter is put into normal operation, the normally open point of the phase sequence protector 1 is short-circuited by the normally open point of the auxiliary contact of the third AC contactor 9, which can avoid the oil filter tripping due to power supply disturbance. By technically modifying the circuit of the phase sequence protector 1 of the mobile oil filter 5, the correct wiring phase sequence of the mobile oil filter 5 can be ensured, and the defect of frequent tripping can be effectively solved.
[0017] The use method and working principle of this device: through the normally open setting of the third AC contactor 9 of the oil pump motor main contactor 10, it is connected in parallel with the auxiliary contact NO point Ta / Tc point of the phase sequence protector 1. When the mobile oil filter 5 is connected, the main contactor of the oil pump motor main contactor 10 is not energized. The wiring phase sequence can be confirmed by observing the indicator light of the phase sequence protector 1 to confirm whether the wiring phase sequence is correct. If the phase sequence is wrong, Ta / Tc is open, and the auxiliary contact of the third AC contactor 9 is a normally open point, the oil pump motor cannot be started. When the phase sequence is correct and the oil filter is put into normal operation, the normally open point of the phase sequence protector 1 is short-circuited by the normally open point of the auxiliary contact of the third AC contactor 9, which can avoid the oil filter tripping due to power supply disturbance.
[0018] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.
Claims
1. A new type of power supply monitoring circuit, characterized in that: The invention comprises a phase sequence protector (1), a mobile oil filter (5), a start switch (6), a second AC contactor (7), a stop switch (8), a third AC contactor (9) and an oil pump motor main contactor (10), wherein the Ta and Tc ends of the phase sequence protector (1) are connected in parallel with the two ends of the third AC contactor (9), one end of the third AC contactor (9) is connected to the oil pump motor main contactor (10), the other end of the third AC contactor (9) is connected to one end of the stop switch (8), the start switch (6) is connected in parallel with the second AC contactor (7), and one end of the second AC contactor (7) is connected to the other end of the stop switch (8).
2. A novel power supply monitoring circuit according to claim 1, characterized in that: The input end of the mobile oil filter (5) is connected to a first AC contactor (4), and one end of the first AC contactor (4) is connected to a switch (3).
3. A novel power supply monitoring circuit according to claim 2, characterized in that: The first AC contactor (4) and the switch (3) are connected in parallel with the phase sequence protector (1).
4. A novel power supply monitoring circuit according to claim 3, characterized in that: One end of the switch (3) is connected to a fuse (2).