A detection system and detection method for grounding knife switch

Abstract

A detection system and method for a grounding knife switch, comprising a V+ detection power supply, a 24VDC power supply, a detection device, and an audible and visual alarm, wherein the detection device comprises a grounding connection detection device and a grounding knife switch detection device, wherein one end of the grounding connection detection device is connected to the V+ detection power supply through a detection switch K1, and the other end is divided into three paths and respectively connected to the lower contacts N1, N3, and N5 of the A\B\C phases of the grounding knife switch; one end of the grounding knife switch detection device is connected to the V+ detection power supply through a detection switch K2, and the other end is divided into three paths and respectively connected to the upper contacts N2, N4, and N6 of the A\B\C phases of the grounding knife switch; the detection switch K1 is closed to detect the grounding connection state, and if the grounding connection state is normal, the detection switch K2 is closed to detect the connection state of the grounding knife switch; when the connection state is abnormal, an alarm is given through the audible and visual alarm. The present invention can accurately detect the knife switch state and effectively prevent misoperation.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power, and in particular relates to a detection system and a detection method for a grounding switch. Background Art

[0002] Grounding switches are widely used in the power industry and are grounding measures taken to ensure safety. If there is a problem with the grounding switch itself or the grounding, effective grounding protection cannot be achieved, which is a major safety hazard and a serious threat to personal and equipment safety. It is particularly important to strengthen the detection and management of grounding switches. However, the current focus is mainly on preventing false locking, and there is no detection and management of grounding switches. Summary of the invention

[0003] In view of the above-mentioned technical problems, a detection system and method for a grounding switch are provided to realize the detection and display of the grounding switch, ensure that the grounding switch is in good condition before closing, and promptly alarm when any problem occurs.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] A grounding switch detection system includes a V+ detection power supply, a 24VDC power supply, a detection device, and an audible and visual alarm. The detection device includes a grounding connection detection device and a grounding switch detection device.

[0006] One end of the ground connection detection device is connected to the V+ detection power supply through the detection switch K1, and the other end is divided into three paths and respectively connected to the lower contacts N1\N3\N5 of the grounding knife switch A\B\C phases;

[0007] One end of the grounding switch detection device is connected to the V+ detection power supply through the detection switch K2, and the other end is divided into three paths and respectively connected to the upper contacts N2\N4\N6 of the grounding switch A\B\C phases;

[0008] The other ends of the detection switches K1 and K2 are connected in parallel to the V+ detection power supply, one end of the sound and light alarm is connected to the +24VDC power supply, and the other end is connected to the -24VDC power supply;

[0009] The contacts KA12, KB12, and KC12 of the relays KA1, KB1, and KC1 of the ground connection detection device are connected in series in sequence, the contact KC12 end is connected to a -24VDC power supply through the relay KJ1 coil, and the contact KA12 is connected to a +24VDC power supply;

[0010] The contacts KA22, KB22, and KC22 of the relays KA2, KB2, and KC2 of the grounding switch detection device are connected in series in sequence, and the contact KC22 end is connected to a -24VDC power supply through the coil of the relay KJ2.

[0011] Contact KA22 is connected to +24VDC power supply;

[0012] After the detection switch K1 is closed, the grounding connection state is detected. When the grounding connection state is normal, after the detection switch K2 is closed, the connection state of the grounding switch is detected; when the connection state is abnormal, an alarm is sounded and lighted.

[0013] The beneficial effects of the present invention are:

[0014] 1. The present invention can detect and display the grounding switch, ensure that the grounding switch is in good condition before closing, and give an alarm in time when a problem occurs.

[0015] 2. The present invention respectively sets up an independent grounding connection detection device and a grounding knife switch detection device, and connects the sound and light alarm in parallel, so as to respectively detect whether the grounding connection status of the grounding knife switch and the connection status of the grounding knife switch itself are normal. The display circuit displays a fault alarm, and the state of the knife switch can be effectively and accurately detected to prevent equipment damage and personal safety hazards caused by faulty operation.

[0016] 3. The grounding switch detection device of the present invention connects a bracket to the main shaft of the grounding switch, and connects the cable contacts through the bracket. When the main shaft of the grounding switch rotates, the cable contacts on the bracket are driven to connect with the transmission at the upper end of the grounding switch for detection. When no detection is required, the connection between the two is disconnected, and the operation is convenient, fast and safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the circuit structure of the present invention.

[0018] Figure 2 It is a schematic diagram of the ground connection detection device of the present invention.

[0019] Figure 3 This is a schematic diagram of a ground connection display device according to the present invention.

[0020] Figure 4 It is a schematic diagram of the grounding switch detection device of the present invention.

[0021] Figure 5 for Figure 4 Schematic diagram of the connecting cable rotation device between the relay and the earthing switch.

[0022] Figure 6 It is a schematic diagram of the grounding switch display device of the present invention.

[0023] Figure 7 The present invention is a flow chart of the detection method.

[0024] In the figure: 1. Main shaft, 21 / 22 / 23. Insulation block, 31 / 32 / 33. Cable, 41 / 42 / 43. Bracket, S1 / S2 / S3. Contact. DETAILED DESCRIPTION

[0025] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0026] Example: Figure 1 As shown, a detection device for a grounding knife switch of the present invention comprises a V+ detection power supply, a 24VDC power supply, a detection device, and an audible and visual alarm. The detection device comprises a grounding connection detection device and a grounding knife switch detection device, wherein one end of the grounding connection detection device is connected to the V+ detection power supply through a detection switch K1, and the other end is divided into three paths and respectively connected to the lower contacts N1, N3, and N5 of the A\B\C phases of the grounding knife switch; one end of the grounding knife switch detection device is connected to the V+ detection power supply through a detection switch K2, and the other end is divided into three paths and respectively connected to the upper contacts N2, N4, and N6 of the A\B\C phases of the grounding knife switch; the other ends of the detection switches K1 and K2 are connected to the V+ detection power supply in parallel, and one end of the audible and visual alarm is connected to the +24VDC power supply, and the other end is connected to the -24VDC power supply;

[0027] The contacts KA22, KB22, and KC22 of the relays KA2, KB2, and KC2 of the grounding switch detection device are connected in series in sequence, and the contact KC22 end is connected to a -24VDC power supply through the coil of the relay KJ2.

[0028] Contact KA22 is connected to +24VDC power supply;

[0029] After the detection switch K1 is closed, the grounding connection state is detected. When the grounding connection state is normal, after the detection switch K2 is closed, the connection state of the grounding switch is detected; when the connection state is abnormal, an alarm is sounded and lighted.

[0030] like Figure 2 As shown, the ground connection detection device includes a detection switch K1, relays KA1, KB1, and KC1. One end of the coil of the relays KA1, KB1, and KC1 is connected in parallel to one end of the detection switch K1, and the other end of the detection switch K1 is connected to the power supply V+. The other ends of the coils of the relays KA1, KB1, and KC1 are respectively connected to the lower contacts N1, N3, and N5 of the grounding switch, and the ground wire is connected through the lower contacts N1, N3, and N5 of the grounding switch; the detection switch K1 is closed to detect the ground connection status, and the detection switch K1 is opened without detection; the power supply V+ can use a 24V-220V power supply.

[0031] When the grounding knife switch is not closed, the grounding connection detection device closes the detection switch K1 to detect the state of the grounding connection, and performs three-phase detection of the grounding connection A, B, and C through the lower end contacts N1, N3, and N5 of the grounding knife switch. After the detection switch K1 is opened, no detection is performed.

[0032] like Figure 3 As shown, the ground connection detection device is also connected to a ground connection display device, including indicator lights LA1, LB1, and LC1. One end of the indicator light is connected to the contacts of relays KA1, KB1, and KC1, respectively. KA11, KB11, and KC11 are then connected in parallel to a +24VDC power supply, and the other end of the indicator light is connected in parallel to a -24VDC power supply. When the ground connection detection device detects that the grounding state of the grounding knife switch is good, the indicator light is on. When there is a fault in the grounding state, the indicator light is off.

[0033] In this example, the detection switch K1 provides power detection for the ground connection detection device. After the detection is completed, you can choose to keep the detection switch K1 closed to detect and display the ground connection status in real time. You can also choose to open the detection switch K1 and no longer detect and display the ground connection.

[0034] like Figure 4 As shown, the grounding switch detection device includes a detection switch K2, relays KA2, KB2, and KC2. One end of the coil of the relays KA2, KB2, and KC2 is connected in parallel to one end of the detection switch K2, and the other end of the detection switch K2 is connected to the power supply V+. The other end of the detection switch K2 is connected to the V+ detection power supply. When the grounding switch is closed, the other ends of the coils of the relays KA2, KB2, and KC2 are respectively connected to the terminal S2 of the cable 31, the terminal S4 of the cable 32, and the terminal S6 of the cable 33. When the grounding switch is closed, the terminal S1 of the cable 31, the terminal S3 of the cable 32, and the terminal S5 of the cable 33 at the other ends are connected to the upper contacts N2, N4, and N6 of the grounding switch as the bracket rotates, and the ground wire is connected through the lower contacts N1, N3, and N5 of the grounding switch; the detection switch K2 is closed to detect the connection status of the grounding switch, and the detection switch K2 is opened without detection.

[0035] like Figure 5As shown, the other end of the coil of the relay KA2, KB2, KC2 is connected to the upper end contact N2, N4, N6 of the grounding knife switch through a rotating device. The rotating device is connected to three brackets on the main shaft 1 of the grounding knife switch, which correspond to the three-phase contacts of the grounding knife switch respectively. Each bracket 41 / 42 / 43 is connected to the other end terminal S1, S3, S5 of the cable 31 / 32 / 33 through the insulating block 21 / 22 / 23. When the grounding knife switch is closed, the main shaft 1 of the grounding knife switch is rotated, which drives the bracket 41 / 42 / 43 to rotate at the same time, so that the terminals S1, S3, S5 of the cable 31 / 32 / 33 are respectively connected to the upper three-phase contacts N2, N4, N6 of the grounding knife switch. After the detection switch K2 is closed, the three-phase A, B, C of the grounding knife switch are detected. After the detection switch K2 is disconnected, no detection is performed.

[0036] Under normal working conditions, the upper contact of the grounding switch is energized. The rotating device in this example is designed to achieve disconnection when the grounding switch is disconnected and is only connected when the grounding switch is closed to ensure safe operation.

[0037] like Figure 6 As shown, a grounding switch display device is also connected, including indicator lights LA2, LB2, and LC2. One end of the indicator light is respectively connected to the contacts KA21, KB21, and KC21 of relays KA2, KB2, and KC2 and then connected in parallel to a +24VDC power supply, and the other end of the indicator light is connected in parallel to a -24VDC power supply.

[0038] In this example, the detection switch K2 provides power detection for the grounding knife switch detection device. After the detection is completed, you can choose to keep the detection switch K2 closed to detect and display the status of the grounding connection in real time. You can also choose to open the detection switch K2 and no longer detect and display the grounding connection.

[0039] The power supplies described in this example are independent of each other. The two detection devices are powered by a 24-220V power supply, and the display device and the sound and light alarm circuit are powered by +24VDC.

[0040] like Figure 1 As shown, in the detection device of this example, when the three-phase grounding of the grounding knife switch ABC is normal, the relay KJ1\KJ2 is energized, its normally closed contact is disconnected, and the sound and light alarm does not alarm. If the three-phase grounding of the grounding knife switch ABC is abnormal, an alarm signal is issued in time.

[0041] The detection method of the detection system of the grounding switch in this example is characterized by comprising the following steps:

[0042] (1) When the grounding switch is not closed, the grounding connection status of the grounding switch is detected by the grounding connection detection device;

[0043] (2) Determine whether the ground connection status in step (1) is normal. If the connection status is abnormal, the sound and light alarm will sound and the detection will end; if the connection status is normal, proceed to step (3);

[0044] (3) Close the grounding switch and use the grounding switch detection device to detect the connection status of the grounding switch itself;

[0045] (4) Determine whether the connection status of the grounding switch in step (3) is normal. If the connection status is abnormal, the sound and light alarm will sound and the detection will end; if the connection status of the grounding switch is normal, the detection is completed;

[0046] Among them, when the three-phase grounding of the grounding switch is normal, relay KJ1 connected between the grounding connection detection device and the sound and light alarm, and relay KJ2 between the grounding switch detection device and the sound and light alarm are energized, their normally closed contacts are disconnected, and the sound and light alarm does not alarm; on the contrary, when the grounding is abnormal, relays KJ1 and KJ2 are not energized, and the sound and light alarm alarms.

[0047] The detection method of the grounding connection detection device described in this example is to control the closing of the detection switch K1 when the grounding knife switch is not closed, and to judge whether the relay KJ1 is energized, to detect the connection status of the relays KA1, KB1, KC1 coils respectively connected to the three-phase lower end contacts N1, N3, N5 of the grounding knife switch, and to display the indicator lights LA1, LB1, LC1 of the contacts KA11, KB11, KC11 of the relays KA1, KB1, KC1. If the relays KA1, KB1, KC1 coils are energized and the indicator lights LA1, LB1, LC1 of the connection contacts KA11, KB11, KC11 are on, it means the grounding connection is normal. If the indicator lights are off, it means there is a fault, and the sound and light alarm will sound an alarm.

[0048] The detection method of the grounding switch detection device is that when the grounding switch is in a closed state, by controlling the closing of the detection switch K2, by judging whether the relay KJ2 is energized, the connection state of the relay KA2, KB2, KC2 coils respectively connected to the three-phase upper end contacts N2, N4, N6 of the grounding switch is detected, and the indicator lights LA2, LB2, LC2 of the contacts KA21, KB21, KC21 of the relay KA2, KB2, KC2 are displayed. If the relay KA2, KB2, KC2 coils are energized and the indicator lights LA2, LB2, LC2 of the contacts KA21, KB21, KC21 are on, it indicates that the grounding connection is normal, and if the indicator light is off, it means that there is a fault, and an audible and visual alarm is used to alarm.

[0049] like Figure 1 , Figure 7As shown, when the present invention is in use, the grounding switch is first placed in an unclosed state, and then the detection switch K1 is closed to detect the grounding connection state. The indicator lights LA1, LB1, and LC1 of the connection contacts KA11, KB11, and KC11 of the relays KA2, KB2, and KC2 are on, indicating that the grounding connection is normal. The indicator light is off, indicating that there is a fault. If the grounding connection display device shows that the grounding connection is abnormal, an alarm is given through an audible and visual alarm, and the grounding switch is not closed. If the display is normal, the grounding switch is closed, the detection switch K2 is closed, and the grounding switch detection device is used to detect whether the connection state of the grounding switch is normal. The indicator lights LA2, LB2, and LC2 of the contacts KA21, KB21, and KC21 of the relays KA2, KB2, and KC2 coils are on, indicating that the grounding connection is normal. The indicator light is off, indicating that there is a fault. If the grounding switch displays abnormally, an alarm is given through an audible and visual alarm. If the grounding switch displays normally, the detection is terminated.

Claims

1. A detection system for a grounding switch, characterized in that: It includes a V+ detection power supply, a 24VDC power supply, a detection device, and an audible and visual alarm. The detection device includes a ground connection detection device and a ground switch detection device. One end of the ground connection detection device is connected to the V+ detection power supply through the detection switch K1, and the other end is divided into three paths and respectively connected to the lower contacts N1\N3\N5 of the grounding knife switch A\B\C phases; One end of the grounding switch detection device is connected to the V+ detection power supply through the detection switch K2, and the other end is divided into three paths and respectively connected to the upper contacts N2\N4\N6 of the grounding switch A\B\C phases; The other ends of the detection switches K1 and K2 are connected in parallel to the V+ detection power supply, one end of the sound and light alarm is connected to the +24VDC power supply, and the other end is connected to the -24VDC power supply; The contacts KA12, KB12, and KC12 of the relays KA1, KB1, and KC1 of the ground connection detection device are connected in series in sequence, the contact KC12 end is connected to a -24VDC power supply through the relay KJ1 coil, and the contact KA12 is connected to a +24VDC power supply; The contacts KA22, KB22, and KC22 of the relays KA2, KB2, and KC2 of the grounding switch detection device are connected in series in sequence, and the contact KC22 end is connected to a -24VDC power supply through the coil of the relay KJ2. Contact KA22 is connected to +24VDC power supply; After the detection switch K1 is closed, the grounding connection state is detected. When the grounding connection state is normal, after the detection switch K2 is closed, the connection state of the grounding switch is detected; when the connection state is abnormal, an alarm is sounded and lighted.

2. The detection system for the grounding switch according to claim 1 is characterized in that: The grounding connection detection device includes a detection switch K1, relays KA1, KB1, and KC1. One end of the coil of the relays KA1, KB1, and KC1 is connected in parallel to one end of the detection switch K1, and the other end of the detection switch K1 is connected to the power supply V+. The other ends of the coils of the relays KA1, KB1, and KC1 are respectively connected to the lower contacts N1, N3, and N5 of the grounding switch, and the ground wire is connected through the lower contacts N1, N3, and N5 of the grounding switch; the detection switch K1 is closed to detect the grounding connection status, and the detection switch K1 is opened without detection.

3. The detection system for the grounding switch according to claim 2 is characterized in that: A ground connection display device is also connected, including indicator lights LA1, LB1, and LC1. One end of the indicator light is connected to the contacts of relays KA1, KB1, and KC1, and then KA11, KB11, and KC11 are connected in parallel to a +24VDC power supply, and the other end of the indicator light is connected in parallel to a -24VDC power supply.

4. The detection system for the grounding switch according to claim 1 is characterized in that: The grounding switch detection device comprises a detection switch K2, relays KA2, KB2, KC2, one end of the coil of the relays KA2, KB2, KC2 is connected in parallel to one end of the detection switch K2, and the other end of the detection switch K2 is connected to a V+ detection power supply. When the grounding switch is closed, the other ends of the coils of the relays KA2, KB2, KC2 are respectively connected to the terminal S2 of the cable (31), the terminal S4 of the cable (32), and the terminal S6 of the cable (33). When the grounding switch is closed, the terminal S1 of the cable (31), the terminal S3 of the cable (32), and the terminal S5 of the cable (33) at the other ends are connected to the upper contacts N2, N4, and N6 of the grounding switch as the bracket rotates, and the ground wire is connected through the lower contacts N1, N3, and N5 of the grounding switch. The detection switch K2 is closed to detect the connection state of the grounding switch, and the detection switch K2 is opened to not perform detection.

5. The detection system for the grounding switch according to claim 4 is characterized in that: A grounding switch display device is also connected, including indicator lights LA2, LB2, and LC2. One end of the indicator light is respectively connected to contacts KA21, KB21, and KC21 of relays KA2, KB2, and KC2 and then connected in parallel to a +24VDC power supply, and the other end of the indicator light is connected in parallel to a -24VDC power supply.

6. The detection system for the grounding switch according to claim 4 is characterized in that: The other end of the coil of the relay KA2, KB2, KC2 is connected to the upper end contact N2, N4, N6 of the grounding switch through a rotating device. The rotating device is connected to three brackets on the main shaft of the grounding switch, which correspond to the three-phase contacts of the grounding switch respectively. Each bracket is connected to the cable terminals S1, S3, S5 through an insulating block. When the grounding switch is closed, the main shaft of the grounding switch is rotated, which drives the bracket to rotate, so that the cable terminals S1, S3, S5 are respectively connected to the upper three-phase contacts N2, N4, N6 of the grounding switch, and the detection switch K2 is closed to detect the three phases A, B, and C of the grounding switch.

7. The detection method of the detection system of the grounding switch according to any one of claims 1 to 6, characterized in that: The steps include: (1) When the grounding switch is not closed, the grounding connection status of the grounding switch is detected by the grounding connection detection device; (2) Determine whether the ground connection status in step (1) is normal. If the connection status is abnormal, the sound and light alarm will sound and the detection will end; if the connection status is normal, proceed to step (3); (3) Close the grounding switch and use the grounding switch detection device to detect the connection status of the grounding switch itself; (4) Determine whether the connection status of the grounding switch in step (3) is normal. If the connection status is abnormal, the sound and light alarm will sound and the detection will end; if the connection status of the grounding switch is normal, the detection is completed; Among them, when the three-phase grounding of the grounding switch is normal, relay KJ1 connected between the grounding connection detection device and the sound and light alarm, and relay KJ2 between the grounding switch detection device and the sound and light alarm are energized, their normally closed contacts are disconnected, and the sound and light alarm does not alarm; on the contrary, when the grounding is abnormal, relays KJ1 and KJ2 are not energized, and the sound and light alarm alarms.

8. The detection method of the detection system of the grounding switch according to claim 7, characterized in that: The detection method of the ground connection detection device is to control the closing of the detection switch K1 when the grounding knife switch is not closed, and to judge whether the relay KJ1 is energized, so as to detect the connection status of the coils of the relays KA1, KB1, and KC1 respectively connected to the three-phase lower end contacts N1, N3, and N5 of the grounding knife switch, and to display the connection status through the indicator lights LA1, LB1, and LC1 of the contacts KA11, KB11, and KC11 of the relays KA1, KB1, and KC1, and to give an alarm through the sound and light alarm.

9. The detection method of the detection system of the grounding switch according to claim 7, characterized in that: The detection method of the grounding switch detection device is to control the closing of the detection switch K2 when the grounding switch is in a closed state, and to judge whether the relay KJ2 is energized, so as to detect the connection status of the coils of the relays KA2, KB2, and KC2 respectively connected to the three-phase upper end contacts N2, N4, and N6 of the grounding switch, and to display the connection status through the indicator lights LA2, LB2, and LC2 of the contacts KA21, KB21, and KC21 of the relays KA2, KB2, and KC2, and to give an alarm through the sound and light alarm.

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