Grounding short circuit fault indicator

Abstract

The utility model discloses a grounding short-circuit fault indicator, relates to the technical field of grounding short-circuit fault indicators, and aims to solve the technical problem that a short-circuit fault sensor and a grounding sensor in a current grounding short-circuit fault indicator are not convenient enough to install. Comprising a fault indicator host, a grounding sensor, a short-circuit fault sensor A, a short-circuit fault sensor B and a short-circuit fault sensor C. Optical fibers are connected between the grounding sensor, the short-circuit fault sensor A, the short-circuit fault sensor B and the short-circuit fault sensor C and the fault indicator host. A fixing structure is arranged on the rear sides of the grounding sensor, the A short-circuit fault sensor, the B short-circuit fault sensor and the C short-circuit fault sensor, and the fixing structure comprises a mounting plate. The device has the advantage that the A short-circuit fault sensor, the B short-circuit fault sensor, the C short-circuit fault sensor and the grounding sensor can be quickly installed.

Description

Technical Field

[0001] The utility model relates to the technical field of grounding short - circuit fault indicators, and more specifically, to a grounding short - circuit fault indicator. Background Art

[0002] The grounding short - circuit fault indicator mainly consists of three groups of short - circuit fault sensors (ABC), a grounding sensor, and a fault indicator host. The three groups of short - circuit fault sensors (ABC) and the grounding sensor are all installed on the outgoing cable. The fault indicator host is installed in a high - voltage medium - voltage switchgear or a ring - main unit. The three groups of short - circuit fault sensors (ABC) and the grounding sensor are connected to the fault indicator host through optical fibers to transmit signals. When a short - circuit or grounding fault occurs in the outgoing cable, when the electromagnetic field changes due to the short - circuit or grounding current, a pulse signal is generated in the measuring coil of the sensor fixed on the cable. When the magnitude of the pulse signal reaches or exceeds the set fault current value, the corresponding fault indicator light on the fault indicator host flashes to give a fault indication.

[0003] In the existing grounding short - circuit fault indicator, when installing the three groups of short - circuit fault sensors (ABC), it is usually necessary to first remove the installation parts on them, then fit the short - circuit fault sensor over the cable and connect it to the short - circuit fault sensor, and then fix it by screwing the screw rod. When installing the grounding sensor on the cable, it is necessary to first remove a set of fixing parts, then fit the grounding sensor over the cable and fixedly connect it to the grounding sensor, and then fasten it with a cable tie. Therefore, the installation of the short - circuit fault sensors and the grounding sensor is very troublesome and not conducive to use. In view of this, we propose a grounding short - circuit fault indicator. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art, meet the actual needs, and provide a grounding short - circuit fault indicator to solve the technical problem that the installation of the short - circuit fault sensor and the grounding sensor in the current grounding short - circuit fault indicator is not convenient enough.

[0005] To solve the above - mentioned technical problems, the utility model provides the following technical solution: A grounding short - circuit fault indicator, including a fault indicator host, a grounding sensor, an A - phase short - circuit fault sensor, a B - phase short - circuit fault sensor, and a C - phase short - circuit fault sensor. Optical fibers are connected between the grounding sensor, the A - phase short - circuit fault sensor, the B - phase short - circuit fault sensor, the C - phase short - circuit fault sensor and the fault indicator host.

[0006] There is a fixing structure arranged at the rear sides of the grounding sensor, the A short - circuit fault sensor, the B short - circuit fault sensor, and the C short - circuit fault sensor. The fixing structure includes a mounting plate, which is arranged on one side corresponding to the grounding sensor, the A short - circuit fault sensor, the B short - circuit fault sensor, and the C short - circuit fault sensor. A clamping plate is elastically arranged on the mounting plate through a first spring. The mounting plate and the clamping plate are arranged at a right angle. The clamping plate is located at the rear sides of the corresponding grounding sensor, the A short - circuit fault sensor, the B short - circuit fault sensor, and the C short - circuit fault sensor.

[0007] On the side of the clamping plate facing the grounding sensor, a number of groups of clamping bars are elastically arranged through a second spring. The clamping bars are arranged side by side. Each clamping bar includes a rectangular rod and a semi - circular rod, and the semi - circular rod is arranged in front of the rectangular rod.

[0008] Through the designed fixing structure of the present utility model, when installing the A short - circuit fault sensor, the B short - circuit fault sensor, the C short - circuit fault sensor, and the grounding sensor on the cable, directly drive the clamping plate on the mounting plate backward, then insert the opening formed by the clamping plate and the A short - circuit fault sensor, the B short - circuit fault sensor, the C short - circuit fault sensor, and the grounding sensor into the cable. Then release the clamping plate. Under the action of the first spring, the clamping plate is pushed to reset. Then, the clamping plate cooperates with the A short - circuit fault sensor, the B short - circuit fault sensor, the C short - circuit fault sensor, and the grounding sensor to directly clamp the cable, so that the A short - circuit fault sensor, the B short - circuit fault sensor, the C short - circuit fault sensor, and the grounding sensor can be quickly installed on the cable. When the clamping plate clamps the cable, the clamping bars corresponding to the cable will displace backward, and the remaining clamping bars remain unchanged. Therefore, a number of groups of clamping bars will form an arc - shaped groove matching the cable, so that the cable is clamped more stably on the A short - circuit fault sensor, the B short - circuit fault sensor, the C short - circuit fault sensor, and the grounding sensor and is not easy to fall off. Moreover, the semi - circular rod in front of the clamping bar can play a protective role to avoid scratching the cable when the clamping bar clamps the cable.

[0009] Preferably, a rectangular hole is opened at one end of the clamping plate, and the rectangular hole is sleeved on the mounting plate.

[0010] Preferably, a welding plate is arranged at the rear end of the mounting plate on the side facing away from the second spring, and a notch is formed between the welding plate and the clamping plate. The first spring is arranged in the notch.

[0011] Preferably, a clamping groove is arranged on the side of the mounting plate facing the grounding sensor, and the size of the clamping groove matches the sizes of the corresponding grounding sensor, the A short - circuit fault sensor, the B short - circuit fault sensor, and the C short - circuit fault sensor.

[0012] Preferably, a limiting rod is arranged at the center of the rear side of the rectangular rod, and the limiting rod penetrates through the clamping plate.

[0013] Preferably, a number of groups of round holes are arranged on the surface of the clamping plate, and the diameter of the round holes is the same as that of the limiting rod.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] 1. Through the designed fixing structure of the present utility model, when installing the A short-circuit fault sensor, B short-circuit fault sensor, C short-circuit fault sensor and grounding sensor on the cable, the clamping plate on the mounting plate is directly driven backward, and then the opening formed by the clamping plate and the A short-circuit fault sensor, B short-circuit fault sensor, C short-circuit fault sensor and grounding sensor is inserted onto the cable. Then, the clamping plate is released. Under the action of the first spring, the clamping plate is pushed to reset. Then, the clamping plate cooperates with the A short-circuit fault sensor, B short-circuit fault sensor, C short-circuit fault sensor and grounding sensor to directly clamp the cable, so that the A short-circuit fault sensor, B short-circuit fault sensor, C short-circuit fault sensor and grounding sensor can be quickly installed on the cable, solving the technical problem that the installation of the short-circuit fault sensor and grounding sensor in the current grounding short-circuit fault indicator is not convenient enough. Therefore, the present utility model has the advantage of quickly installing the A short-circuit fault sensor, B short-circuit fault sensor, C short-circuit fault sensor and grounding sensor.

[0016] 2. A number of groups of clamping strips are arranged on the clamping plate of the present utility model through the second spring, and the clamping strips are arranged side by side. Therefore, when the clamping plate clamps the cable, the clamping strips corresponding to the cable will move backward, and the remaining clamping strips remain unchanged. Therefore, a number of groups of clamping strips will form an arc-shaped groove matching the cable, so that the cable is clamped more stably on the A short-circuit fault sensor, B short-circuit fault sensor, C short-circuit fault sensor and grounding sensor and is not easy to fall off. Moreover, the semi-circular rod on the front side of the clamping strip can play a protective role to avoid scratching the cable when the clamping strip clamps the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0018] Figure 2 is a schematic diagram of the fixing structure of the present utility model;

[0019] Figure 3 is a schematic diagram of the clamping plate structure of the present utility model;

[0020] Figure 4 is a schematic cross-sectional structure diagram of the clamping plate of the present utility model.

[0021] Description of the reference numerals in the drawings:

[0022] 1. Fault indicator host; 2. Grounding sensor; 3. A-phase short-circuit fault sensor; 4. B-phase short-circuit fault sensor; 5. C-phase short-circuit fault sensor; 6. Optical fiber; 7. Fixed structure; 8. Mounting plate; 801. Clamping groove; 802. Welding plate; 803. Notch; 9. First spring; 10. Clamping plate; 1001. Second spring; 1002. Clamping strip; 1003. Limiting rod; 1004. Round hole; 1005. Rectangular hole; 1006. Rectangular rod; 1007. Semi-circular rod. Detailed implementation

[0023] As Figures 1 to 4 shown, a grounding short-circuit fault indicator related to the present utility model includes a fault indicator host 1, a grounding sensor 2, an A-phase short-circuit fault sensor 3, a B-phase short-circuit fault sensor 4, and a C-phase short-circuit fault sensor 5. An optical fiber 6 is connected between the grounding sensor 2, the A-phase short-circuit fault sensor 3, the B-phase short-circuit fault sensor 4, the C-phase short-circuit fault sensor 5 and the fault indicator host 1. The fault indicator host 1, the grounding sensor 2, the A-phase short-circuit fault sensor 3, the B-phase short-circuit fault sensor 4, and the C-phase short-circuit fault sensor 5 form a grounding short-circuit fault indicator. The grounding sensor 2, the A-phase short-circuit fault sensor 3, the B-phase short-circuit fault sensor 4, and the C-phase short-circuit fault sensor 5 are all installed on the outgoing cable. The fault indicator host 1 is installed in a high-voltage medium-voltage switchgear or a ring main unit. The grounding sensor 2, the A-phase short-circuit fault sensor 3, the B-phase short-circuit fault sensor 4, and the C-phase short-circuit fault sensor 5 are connected to the fault indicator host 1 through the optical fiber 6 to transmit signals. When a short circuit or grounding fault occurs in the outgoing cable, the electromagnetic field changes caused by the short-circuit or grounding current. The measuring coil in the sensor fixed on the cable generates a pulse signal. When the magnitude of the pulse signal value reaches or exceeds the set fault current value, the corresponding fault indicator light on the fault indicator host 1 flashes to give a fault indication;

[0024] In an embodiment of the present utility model, a fixing structure 7 is arranged behind the grounding sensor 2, the A short-circuit fault sensor 3, the B short-circuit fault sensor 4, and the C short-circuit fault sensor 5. The fixing structure 7 includes a mounting plate 8, which is arranged on one side corresponding to the grounding sensor 2, the A short-circuit fault sensor 3, the B short-circuit fault sensor 4, and the C short-circuit fault sensor 5. A clamping plate 10 is elastically arranged on the mounting plate 8 through a first spring 9. The mounting plate 8 and the clamping plate 10 are arranged at a right angle. The clamping plate 10 is located behind the corresponding grounding sensor 2, the A short-circuit fault sensor 3, the B short-circuit fault sensor 4, and the C short-circuit fault sensor 5. When installing the grounding sensor 2, the A short-circuit fault sensor 3, the B short-circuit fault sensor 4, and the C short-circuit fault sensor 5 on the cable, directly drive the clamping plate 10 on the mounting plate 8 backward, then insert the opening formed by the clamping plate 10 and the corresponding grounding sensor 2, the A short-circuit fault sensor 3, the B short-circuit fault sensor 4, and the C short-circuit fault sensor 5 into the cable, and then release the clamping plate 10. Under the action of the first spring 9, the clamping plate 10 is pushed to reset, and then the clamping plate 10 cooperates with the corresponding grounding sensor 2, the A short-circuit fault sensor 3, the B short-circuit fault sensor 4, and the C short-circuit fault sensor 5 to directly clamp the cable, so that the corresponding grounding sensor 2, the A short-circuit fault sensor 3, the B short-circuit fault sensor 4, and the C short-circuit fault sensor 5 can be quickly installed on the cable.

[0025] Specifically, a rectangular hole 1005 is opened at one end of the clamping plate 10, and the rectangular hole 1005 is sleeved on the mounting plate 8. The clamping plate 10 can freely slide on the mounting plate 8 through the rectangular hole 1005, playing a limiting role.

[0026] Furthermore, a welding plate 802 is arranged at the rear end of the mounting plate 8 on the side opposite to the second spring 1001, and a notch 803 is formed between the welding plate 802 and the clamping plate 10. The first spring 9 is arranged in the notch 803. By pinching the welding plate 802 and the clamping plate 10 of the notch 803, the first spring 9 can be compressed, and at this time, the clamping plate 10 will move backward.

[0027] Still further, a clamping groove 801 is arranged on the mounting plate 8 on the side facing the grounding sensor 2, and the size of the clamping groove 801 matches the size of the corresponding grounding sensor 2, the A short-circuit fault sensor 3, the B short-circuit fault sensor 4, and the C short-circuit fault sensor 5. The clamping groove 801 is used to clamp the corresponding grounding sensor 2, the A short-circuit fault sensor 3, the B short-circuit fault sensor 4, and the C short-circuit fault sensor 5, which can ensure the stability of the mounting plate 8.

[0028] In an embodiment of the present utility model, a plurality of groups of clamping bars 1002 are elastically arranged on one side of the clamping plate 10 facing the grounding sensor 2 through a second spring 1001. The clamping bars 1002 are arranged side by side. The clamping bar 1002 includes a rectangular rod 1006 and a semi-circular rod 1007. The semi-circular rod 1007 is arranged on the front side of the rectangular rod 1006. When the clamping plate 10 clamps the cable, the clamping bar 1002 corresponding to the cable will displace backward, and the remaining clamping bars 1002 remain unchanged. Therefore, a plurality of groups of clamping bars 1002 will form an arc-shaped groove matching the cable, which has an effect of clamping and limiting the cable, so that the cable is more stably clamped on the grounding sensor 2, the A short-circuit fault sensor 3, the B short-circuit fault sensor 4 and the C short-circuit fault sensor 5 and is not easy to fall off. Moreover, the semi-circular rod 1007 on the front side of the clamping bar 1002 can play a protective role to prevent the clamping bar 1002 from scratching the cable when clamping the cable.

[0029] Specifically, a limiting rod 1003 is arranged at the center of the rear side of the rectangular rod 1006. The limiting rod 1003 penetrates through the clamping plate 10. The limiting rod 1003 has an effect of limiting the clamping bar 1002 to prevent the clamping bar 1002 from shifting.

[0030] Furthermore, a plurality of groups of round holes 1004 are arranged on the surface of the clamping plate 10, and the diameter of the round hole 1004 is the same as the diameter of the limiting rod 1003. The round hole 1004 facilitates the sliding of the limiting rod 1003.

[0031] Working principle: This embodiment provides a grounding short-circuit fault indicator. First, the fault indicator host 1, the grounding sensor 2, the A short-circuit fault sensor 3, the B short-circuit fault sensor 4 and the C short-circuit fault sensor 5 form a grounding short-circuit fault indicator. The grounding sensor 2, the A short-circuit fault sensor 3, the B short-circuit fault sensor 4 and the C short-circuit fault sensor 5 are all installed on the outgoing cable. The fault indicator host 1 is installed in a high-voltage medium-voltage switchgear or a ring main unit. The grounding sensor 2, the A short-circuit fault sensor 3, the B short-circuit fault sensor 4 and the C short-circuit fault sensor 5 are connected to the fault indicator host 1 through an optical fiber 6 to transmit signals. When a short-circuit or grounding fault occurs in the outgoing cable, the electromagnetic field changes caused by the short-circuit or grounding current. The measuring coil in the sensor fixed on the cable generates a pulse signal. When the magnitude of the pulse signal value reaches or exceeds the set fault current value, the corresponding fault indicator light on the fault indicator host 1 flashes to give a fault indication;

[0032] Secondly, when installing the ground sensor 2, A short-circuit fault sensor 3, B short-circuit fault sensor 4, and C short-circuit fault sensor 5 on the cable, directly drive the clamping plate 10 on the mounting plate 8 backward, and then insert the opening formed by the clamping plate 10 and the corresponding ground sensor 2, A short-circuit fault sensor 3, B short-circuit fault sensor 4, and C short-circuit fault sensor 5 into the cable. Then release the clamping plate 10. Under the action of the first spring 9, the clamping plate 10 is pushed to reset. Then, the clamping plate 10 cooperates with the corresponding ground sensor 2, A short-circuit fault sensor 3, B short-circuit fault sensor 4, and C short-circuit fault sensor 5 to directly clamp the cable, so that the corresponding ground sensor 2, A short-circuit fault sensor 3, B short-circuit fault sensor 4, and C short-circuit fault sensor 5 can be quickly installed on the cable;

[0033] Finally, when the clamping plate 10 clamps the cable, the clamping strip 1002 corresponding to the cable will move backward, and the remaining clamping strips 1002 remain unchanged. Therefore, several groups of clamping strips 1002 will form an arc-shaped groove that matches the cable, which has an effect of clamping and limiting the cable, so that the cable is more stably clamped on the ground sensor 2, A short-circuit fault sensor 3, B short-circuit fault sensor 4, and C short-circuit fault sensor 5 and is not easy to fall off. Moreover, the semi-circular rod 1007 on the front side of the clamping strip 1002 can play a protective role to prevent the clamping strip 1002 from scratching the cable when clamping the cable.

[0034] The embodiments disclosed in the present utility model are preferred embodiments, but not limited thereto. Those of ordinary skill in the art can easily understand the spirit of the present utility model according to the above embodiments and make different extensions and changes. However, as long as they do not depart from the spirit of the present utility model, they are within the protection scope of the present utility model.

Claims

1. A ground short-circuit fault indicator, characterized in that, It includes a fault indicator host (1), a ground sensor (2), an A-phase short-circuit fault sensor (3), a B-phase short-circuit fault sensor (4), and a C-phase short-circuit fault sensor (5). An optical fiber (6) is connected between the ground sensor (2), the A-phase short-circuit fault sensor (3), the B-phase short-circuit fault sensor (4), the C-phase short-circuit fault sensor (5) and the fault indicator host (1). A fixing structure (7) is arranged at the rear sides of the ground sensor (2), the A-phase short-circuit fault sensor (3), the B-phase short-circuit fault sensor (4), and the C-phase short-circuit fault sensor (5). The fixing structure (7) includes a mounting plate (8). The mounting plate (8) is arranged on one side corresponding to the ground sensor (2), the A-phase short-circuit fault sensor (3), the B-phase short-circuit fault sensor (4), and the C-phase short-circuit fault sensor (5). A clamping plate (10) is elastically arranged on the mounting plate (8) through a first spring (9). The mounting plate (8) and the clamping plate (10) are arranged at a right angle. The clamping plate (10) is located at the rear sides of the corresponding ground sensor (2), the A-phase short-circuit fault sensor (3), the B-phase short-circuit fault sensor (4), and the C-phase short-circuit fault sensor (5). On the side of the clamping plate (10) facing the ground sensor (2), a plurality of groups of clamping strips (1002) are elastically arranged through a second spring (1001). The clamping strips (1002) are arranged side by side. The clamping strip (1002) includes a rectangular rod (1006) and a semi-circular rod (1007). The semi-circular rod (1007) is arranged at the front side of the rectangular rod (1006).

2. The grounding short-circuit fault indicator according to claim 1, characterized in that, A rectangular hole (1005) is formed at one end of the clamping plate (10), and the rectangular hole (1005) is sleeved on the mounting plate (8).

3. The earth fault indicator according to claim 1, characterized in that, A welding plate (802) is arranged at the rear end of the mounting plate (8) on the side facing away from the second spring (1001), and a notch (803) is formed between the welding plate (802) and the clamping plate (10). The first spring (9) is arranged in the notch (803).

4. A ground short-circuit fault indicator according to claim 1, characterized in that, A clamping groove (801) is arranged on the side of the mounting plate (8) facing the ground sensor (2), and the size of the clamping groove (801) matches the sizes of the corresponding ground sensor (2), the A-phase short-circuit fault sensor (3), the B-phase short-circuit fault sensor (4), and the C-phase short-circuit fault sensor (5).

5. The ground short-circuit fault indicator according to claim 1, characterized in that, A limiting rod (1003) is arranged at the center of the rear side of the rectangular rod (1006), and the limiting rod (1003) penetrates through the clamping plate (10).

6. The earth fault indicator according to claim 5, characterized in that A plurality of groups of circular holes (1004) are arranged on the surface of the clamping plate (10), and the diameter of the circular holes (1004) is the same as the diameter of the limiting rod (1003).

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