Three-phase power supply measurement assist device for tramcar
By designing a three-phase power supply measurement auxiliary device for trams, and utilizing components such as relays and indicator lights, the problem of not being able to measure three-phase power under high-voltage conditions on the roof of the tram was solved, and safe and accurate voltage, frequency and phase sequence measurements were achieved.
Patent Information
- Application Number
- CN202422481798.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-14
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2034-10-14
AI Technical Summary
During the commissioning of trams, it is impossible to directly measure the voltage, frequency, and phase sequence of the three-phase electricity on the roof because there is a high-voltage overhead contact line on the roof, and existing technology cannot safely and effectively measure these parameters.
Design an auxiliary device for measuring three-phase power supply of a tram, which is equipped with components such as relays, indicator lights and switches. The three-phase power is connected to the relay contacts through wires. The voltage, frequency and phase sequence are measured by the action of the relay contacts. The measurement is carried out in conjunction with equipment such as an oscilloscope.
It enables safe and efficient measurement of three-phase voltage, frequency, and phase sequence on trams, simplifying the measurement process and improving the safety and accuracy of the measurement.
Smart Images
Figure CN223926590U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a tram three -phase power measurement auxiliary device. BACKGROUND
[0002] The voltage, frequency and phase sequence of three -phase power need to be measured in the debugging process of tram, however the auxiliary inverter of tram is located on the roof, and we need to verify whether the output power of auxiliary inverter is within the range before our test. The auxiliary converter provides AC380V 50Hz power, AC380V (40Hz~60Hz) power, single -phase AC220V 50Hz power and DC24V power for the vehicle. We all know that the power except single -phase AC220V 50Hz power and DC24V power cannot be directly measured, and it is obviously not desirable to directly measure three -phase power on the roof, because the roof has a catenary high voltage at this time, so the three -phase power is extended to the vehicle with a wire to measure. UTILITY MODEL CONTENTS
[0003] In order to solve the technical problems existing in the prior art, the purpose of the utility model is to provide a tram three -phase power measurement auxiliary device, which can realize the measurement of three -phase power.
[0004] The auxiliary device is configured with a first relay KM1, a first indicator lamp LED1, a second indicator lamp LED2, a third indicator lamp LED3 and a first switch KA;
[0005] The first relay KM1 includes a first normally open contact, a second normally open contact and a third normally open contact, and each contact includes an upper end contact for three -phase power access and a lower end contact for measurement;
[0006] The first indicator lamp LED1 is connected in series between the upper end contact of the first normally open contact of the first relay KM1 and the upper end contact of the second normally open contact of the first relay KM1; The second indicator lamp LED2 is connected in series between the upper end contact of the second normally open contact of the first relay KM1 and the upper end contact of the third normally open contact of the first relay KM1; The third indicator lamp LED3 is connected in series between the upper end contact of the third normally open contact of the first relay KM1 and the upper end contact of the first normally open contact of the first relay KM1;
[0007] The power for exciting the coil of the first relay KM1 is connected through the first switch KA.
[0008] Further, the first relay KM1 further includes a fourth normally open contact connected in parallel with the first switch KA.
[0009] Further, the auxiliary device is further configured with a second relay KM2, and a power supply for exciting the coil of the first relay KM1 and the coil of the second relay KM2 is accessed through the second relay KM2 and the first switch KA.
[0010] Further, the auxiliary device is further configured with a fourth indicator lamp LED4 in parallel to the coil of the first relay KM1 for indicating measurement start.
[0011] Further, the auxiliary device is further configured with a second switch KB in series with the first switch KA, and the second switch KB is a normally closed switch.
[0012] Further, the auxiliary device is further configured with a time relay KT.
[0013] Further, the auxiliary device is further configured with a box body, and the first relay KM1 is located inside the box body, and the first indicator lamp LED1, the second indicator lamp LED2, the third indicator lamp LED3 and the first switch KA are located on the surface of the box body.
[0014] Further, the auxiliary device is further configured with a suction cup located on the surface of the box body.
[0015] The auxiliary device has the following beneficial effects: the auxiliary device is configured with a relay for three-phase power access, the relay coil is excited, the relay contact is actuated, the upper and lower end contacts of the relay are connected, and the voltage, frequency and phase sequence measurement equipment (such as an oscilloscope) is electrically connected with the lower end contact of the relay, so that the measurement of three-phase power can be realized. BRIEF DESCRIPTION OF DRAWINGS
[0016] The drawings incorporated into the specification and forming a part thereof, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application. It is to be expressly understood that the drawings are only for the purpose of illustration and are as such are not to be construed as limiting the application. In the drawings:
[0017] Figure 1 A circuit principle diagram of the auxiliary device provided by the utility model;
[0018] Figure 2 An appearance diagram of the auxiliary device provided by the utility model. DETAILED DESCRIPTION
[0019] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.
[0020] As used herein, "comprising", "including", "having" and "containing" are inclusive or open-ended and specify the presence of stated features, integers, steps, operations, elements, or components but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Embodiments
[0021] Please refer to Figure 1 The auxiliary device is configured with a first relay KM1, a first indicator lamp LED1, a second indicator lamp LED2, a third indicator lamp LED3 and a first switch KA. The first relay KM1 includes a first normally open contact, a second normally open contact and a third normally open contact, each of which includes an upper end contact for three-phase power access and a lower end contact for measurement. The first indicator lamp LED1 is connected in series between the upper end contact of the first normally open contact of the first relay KM1 and the upper end contact of the second normally open contact of the first relay KM1. The second indicator lamp LED2 is connected in series between the upper end contact of the second normally open contact of the first relay KM1 and the upper end contact of the third normally open contact of the first relay KM1. The third indicator lamp LED3 is connected in series between the upper end contact of the third normally open contact of the first relay KM1 and the upper end contact of the first normally open contact of the first relay KM1. The power source for energizing the coil of the first relay KM1 is accessed through the first switch KA.
[0022] When the auxiliary device is used, three-phase power is accessed to the upper end contacts of the first normally open contact, the second normally open contact and the third normally open contact of the first relay KM1. The first indicator lamp LED1, the second indicator lamp LED2 and the third indicator lamp LED3 are connected in series between the upper end contacts of the first normally open contact, the second normally open contact and the third normally open contact. When three-phase power is accessed, the positive and negative electrodes of the indicator lamp are accessed to the power source and are lit to prompt three-phase power access. At this time, since the first switch KA is not closed, the upper and lower end contacts of the first relay KM1 are not connected, and the lower end contact has no power. When three-phase power needs to be measured, the first switch KA is closed, the coil of the first relay KM1 is connected to the power source, the upper and lower end contacts of the first relay KM1 are connected, the probe or input connector of the voltage, frequency and phase sequence measurement device is contacted with the lower end contact of the first relay KM1 to electrically connect them, and the measurement of the voltage, frequency and phase sequence of three-phase power is completed. After the measurement is completed, the first switch KA is disconnected.
[0023] When the auxiliary device is used in the auxiliary inverter of the tram, the three-phase power output of the auxiliary inverter is connected to the upper end contacts of the first, second and third normally open contacts of the first relay KM1 through wires. The test principle and process are as above, which will not be repeated here; after the test is completed, the first switch KA is disconnected, the auxiliary inverter stops working, and the wires connecting the auxiliary inverter and the auxiliary device are disconnected.
[0024] When the auxiliary device is used to measure the output of the inverter, the first, second and third indicator lights LED1, LED2 and LED3 also realize whether the inverter can normally output and complete the test. If the inverter can normally output, the corresponding indicator light is lit, otherwise it is not lit. Embodiment
[0025] Please refer to Figure 1 The auxiliary device is also provided with a second relay KM2, and the power supply for exciting the coils of the first relay KM1 and the second relay KM2 is connected through the second relay KM2 and the first switch KA. Embodiment
[0026] The auxiliary device provided in this embodiment is further provided with a fourth indicator light LED4 connected in parallel across the coil of the first relay KM1 for indicating the start of measurement on the basis of all the technical features of the auxiliary devices provided in Embodiment One and Embodiment Two.
[0027] The fourth indicator light LED4 is lit in the closed state of the first switch KA (measurement start) and is extinguished in the non-closed state of the first switch KA. Embodiment
[0028] The auxiliary device provided in this embodiment is further provided with a second switch KB connected in series with the first switch KA on the basis of all the technical features of the auxiliary devices provided in Embodiment One, Embodiment Two and Embodiment Three, please refer to Figure 1 .
[0029] The second switch KB is a normally closed switch, which is used as an emergency stop button and is used to cut off the power supply to the relay coil when it is started. Embodiment
[0030] The auxiliary device provided in this embodiment is further provided with a time relay KT on the basis of all the technical features of the auxiliary devices provided in Embodiment One, Embodiment Two and Embodiment Three, and the connection mode of the time relay is as shown in Figure 1 .
[0031] The time relay KT starts timing in the state that the coil is powered on, and the contacts are disconnected when the timing reaches the set time, realizing the automatic power-off function.
[0032] The auxiliary device is also configured with a box body 1, the first relay KM1, the second relay KM2, the time relay KT are located inside the box body, the first indicator light LED1, the second indicator light LED2, the third indicator light LED3, the fourth indicator light LED4, the first switch KA, the second switch KB are located on the surface of the box body (as shown in Figure 2 The first indicator light LED1, the second indicator light LED2, the third indicator light LED3, the fourth indicator light LED4, the first switch KA, the second switch KB are located on the surface of the box body (as shown in
[0033] The box body is a fireproof plastic box, thickened with environmentally friendly materials, large capacity, strong load capacity, not easy to damage, durable.
[0034] The surface of the box body is configured with a suction cup, so that the box body can be attached; the suction cup adopts a 44mm large suction cup with stronger suction force and more reliable attachment. The suction cup configuration allows the auxiliary device to be quickly installed on the support surface, saving the time of the operator.
[0035] The first relay KM1 of the auxiliary device also includes a fourth normally open contact in parallel with the first switch KA (as shown in Figure 1 The fourth normally open contact is closed to build a loop after the coil is energized, so that the first relay KM1 and the second relay KM2 can remain in the power-on state, ensuring measurement.
[0036] The above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the present application, which should be covered in the scope of the claims of the present application. The technical, shape and structure parts not described in detail in the present application are well-known technologies.
Claims
1. A tramcar three-phase power supply measurement aid, characterised in that, The auxiliary device is configured with a first relay KM1, a first indicator lamp LED1, a second indicator lamp LED2, a third indicator lamp LED3 and a first switch KA; The first relay KM1 includes a first normally open contact, a second normally open contact and a third normally open contact, each of which includes an upper end contact for three-phase power access and a lower end contact for measurement; The first indicator lamp LED1 is connected in series between the upper end contact of the first normally open contact of the first relay KM1 and the upper end contact of the second normally open contact of the first relay KM1; the second indicator lamp LED2 is connected in series between the upper end contact of the second normally open contact of the first relay KM1 and the upper end contact of the third normally open contact of the first relay KM1; and the third indicator lamp LED3 is connected in series between the upper end contact of the third normally open contact of the first relay KM1 and the upper end contact of the first normally open contact of the first relay KM1; The power source for energizing the coil of the first relay KM1 is accessed through the first switch KA.
2. The tramcar three-phase power supply measurement aid of claim 1, characterized in that The first relay KM1 further includes a fourth normally open contact in parallel with the first switch KA.
3. The tramcar three-phase power source measurement aid of claim 1, characterized in that, Further configured with a second relay KM2, the power source for energizing the coil of the first relay KM1 and the coil of the second relay KM2 is accessed through the second relay KM2 and the first switch KA.
4. The tramcar three-phase power source measurement aid of claim 1, wherein, Further configured with a fourth indicator lamp LED4 in parallel with the coil of the first relay KM1 for indicating the start of measurement.
5. The tramcar three-phase power source measurement aid of claim 1, wherein, Further configured with a second switch KB in series with the first switch KA, the second switch KB is a normally closed switch.
6. The tramcar three-phase power source measurement aid of claim 1, wherein, Further configured with a time relay KT.
7. The tramcar three-phase power source measurement aid of claim 1, wherein, Further configured with a box body, the first relay KM1 is located inside the box body, and the first indicator lamp LED1, the second indicator lamp LED2, the third indicator lamp LED3 and the first switch KA are located on the surface of the box body.
8. The tramcar three-phase power supply measurement aid of claim 7, characterized in that Further configured with a suction cup located on the surface of the box body.