CN106505521A - A grounding device for a transformer neutral point comprehensive protection system - Google Patents

Abstract

The invention discloses a kind of earthing or grounding means of transformer neutral point Integrated Protection System, including arrester connection end, upper conducting rod, upper contact head, lower conducting rod, lower contact, insulated tension pole and transmission mechanism, arrester connection end is mounted on the end of arrester, one end of upper conducting rod is articulated with arrester connection end, and upper contact head is located at the other end of upper conducting rod, chute is provided with lower conducting rod, slide bar is embedded with chute, lower contact is installed in one end of lower conducting rod, and the other end of lower conducting rod is fixed in the installation pedestal of arrester by lower rotary shaft, insulated tension pole one end hinge arrangement is on upper conducting rod, other end hinge arrangement is on slide bar, transmission mechanism is connected with lower rotary shaft.This invention simplifies earthed system structure, can cost-effective, reduce and take up an area space, zero-sequence current is tested, make system more safe and reliable, can effectively protect electric power system.

Description

A grounding device for a transformer neutral point comprehensive protection system

technical field

The invention relates to a transformer neutral point comprehensive protection system, in particular to a grounding device for a transformer neutral point comprehensive protection system.

Background technique

At present, the transformer neutral point protection system is mainly composed of lightning arresters, isolating switches and discharge gaps. The lightning arresters and isolating switches are arranged side by side. The copper belt is grounded, and for substations with unbalanced loads, when the zero-sequence large current increases to a certain value and exists for a long time, the connection between the disconnector and the ground flat iron or soft copper belt is prone to heat, and when the temperature is too high, the connection point will be fused , loss of protection, poses a serious threat to the entire power supply system.

Contents of the invention

Technical problem to be solved by the present invention: Aiming at the above-mentioned problems of the prior art, a simplified grounding system structure is provided, which can save costs, reduce floor space, and test zero-sequence current, making the system safer and more reliable, and effectively Protect the grounding device of the transformer neutral point comprehensive protection system of the power supply system.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

A grounding device for a transformer neutral point comprehensive protection system, comprising a lightning arrester connection end, an upper conductive rod, an upper contact, a lower conductive rod, a lower contact, an insulating pull rod and a transmission mechanism, and the lightning arrester connection end is installed and fixed on the lightning arrester At the end, one end of the upper conductive rod is hinged on the connection end of the arrester, and the upper contact is arranged on the other end of the upper conductive rod, and a chute is provided in the lower conductive rod, and a chute is embedded in the chute The lower contact is installed on one end of the lower conductive rod, and the other end of the lower conductive rod is installed and fixed on the installation base of the arrester through the lower rotating shaft, and one end of the insulating pull rod is hingedly arranged on the upper conductive rod. One side and the other end of the rod are hingedly arranged on one side of the slide rod, and the output shaft of the transmission mechanism is connected with the lower rotating shaft.

Preferably, the insulating pull rod is composed of an upper connection section, a lower connection section and a plurality of insulators with a shed structure, and the plurality of insulators are connected end to end in sequence and arranged between the upper connection section and the lower connection section.

Preferably, an upper rotating shaft is provided at the end of the connecting end of the arrester, and one end of the upper conductive rod is hinged on the upper rotating shaft at the connecting end of the arrester.

Preferably, a driven gear is sleeved and fixed on the lower rotating shaft, and a driving gear is sleeved and fixed on the output shaft of the transmission mechanism, and the driving gear and the driven gear are meshed with each other.

Preferably, the transmission mechanism is a manual transmission mechanism or an electric transmission mechanism.

Preferably, a current transformer is provided at the lower rotating shaft.

The grounding device of the transformer neutral point comprehensive protection system of the present invention has the following advantages: the present invention includes the connection end of the arrester, the upper conductive rod, the upper contact, the lower conductive rod, the lower contact, the insulating pull rod and the transmission mechanism, and the connection end of the arrester is installed Fixed at the end of the arrester, one end of the upper conductive rod is hinged on the connecting end of the arrester, and the upper contact is set on the other end of the upper conductive rod, a chute is provided in the lower conductive rod, and a sliding rod is embedded in the chute, and the lower The contact is installed on one end of the lower conductive rod, and the other end of the lower conductive rod is fixed on the installation base of the arrester through the lower rotating shaft. One end of the insulating pull rod is hingedly arranged on the upper conductive rod, and the other end is hingedly arranged on the sliding rod. On the top, the output shaft of the transmission mechanism is connected to the lower rotating shaft, supported by the arrester, and the relative distance between the upper conductive rod and the lower conductive rod is adjusted by controlling the rotation of the lower conductive rod, which simplifies the system structure and can save costs and reduce Occupying space and testing the zero-sequence current make the system safer and more reliable, and can effectively protect the power supply system.

Description of drawings

FIG. 1 is a schematic diagram of the structure and principle of an embodiment of the present invention.

Legend: 1. Lightning arrester connection end; 11. Upper rotating shaft; 2. Upper conductive rod; 3. Upper contact; 4. Lower conductive rod; 41. Chute; 42. Slide bar; 43. Lower rotating shaft; 431 , driven gear; 5, lower contact; 6, insulating rod; 61, upper connecting section; 62, lower connecting section; 63, insulator; 7, transmission mechanism; 71, driving gear; 8, current transformer.

detailed description

As shown in Figure 1, the grounding device of the transformer neutral point comprehensive protection system of this embodiment includes a lightning arrester connection terminal 1, an upper conductive rod 2, an upper contact 3, a lower conductive rod 4, a lower contact 5, an insulating pull rod 6 and The transmission mechanism 7, the connecting end 1 of the arrester is installed and fixed on the end of the arrester, one end of the upper conductive rod 2 is hinged on the connecting end 1 of the arrester, and the upper contact 3 is arranged on the other end of the upper conductive rod 2, and the lower conductive rod 4 is provided with There is a chute 41, and a slide bar 42 is embedded in the chute 41. The lower contact 5 is installed on one end of the lower conductive rod 4, and the other end of the lower conductive rod 4 is installed and fixed on the installation base of the arrester through the lower rotating shaft 43. On the seat, one end of the insulating rod 6 is hingedly arranged on one side of the upper conductive rod 2, and the other end is hingedly arranged on one side of the slide bar 42, and the output shaft of the transmission mechanism 7 is connected to the lower rotating shaft 43. As shown in Figure 1, since one end of the upper conductive rod 2 is hinged on the connection end 1 of the arrester, one end of the insulating rod 6 is hingedly arranged on one side of the upper conductive rod 2, and the other end is hingedly arranged on one side of the slide bar 42, so that The range of motion of the upper conductive rod 2 is in the A region in Fig. 1, and the movable range of the lower conductive rod 4 is in the B region of Fig. 1, so that the upper conductive rod 2, the lower The relative distance between the conductive rods 4, when the lower conductive rod 4 is rotated to the leftmost position in Fig. 1, due to the oblique upward moment, the sliding rod 42 slides upwards, and then the upper conductive rod 2 is carried by the insulating pull rod 6 Rotate to the left most, so that the relative distance between the upper conductive rod 2 and the lower conductive rod 4 is the largest; when the lower conductive rod 4 rotates to the rightmost reference line position in Fig. 1, due to the diagonal downward moment, the The slide bar 42 slides downward, and then rotates the upper conductive rod 2 to the far right through the insulating pull rod 6, so that the relative distance between the upper conductive rod 2 and the lower conductive rod 4 is the smallest. At this time, the upper contact 3 and the lower contact The first 5 is contacted to realize grounding; in summary, the grounding device of the transformer neutral point comprehensive protection system of this embodiment is supported by a lightning arrester, and the connection between the upper conductive rod 2 and the lower conductive rod 4 is adjusted by controlling the rotation of the lower conductive rod 4. The relative distance between them simplifies the system structure, which can save costs, reduce the occupied space, test the zero-sequence current, make the system safer and more reliable, and effectively protect the power supply system.

In this embodiment, the insulating pull rod 6 is composed of an upper connecting section 61, a lower connecting section 62 and a plurality of insulators 63 with shed structures, and the plurality of insulators 63 are connected end to end in sequence and arranged on the upper connecting section 61 and the lower connecting section 62. In between, a plurality of insulators 63 with shed structures are connected end-to-end in turn, which can prevent arc discharge due to overvoltage between the upper connecting section 61 and the lower connecting section 62, and has the advantage of reliable insulation performance.

In this embodiment, the end of the connecting end 1 of the arrester is provided with an upper rotating shaft 11, and one end of the upper conductive rod 2 is hinged on the upper rotating shaft 11 of the connecting end 1 of the arrester, and the connecting end 1 of the arrester and the upper conducting rod 2 pass through The axial connection ensures that the upper conductive rod 2 rotates along the axis of the upper rotating shaft 11, and the movement is more stable and reliable, which can improve the reliability and stability when the upper contact 3 and the lower contact 5 are short-circuited.

In this embodiment, a driven gear 431 is sleeved and fixed on the lower rotating shaft 43, and a driving gear 71 is sleeved and fixed on the output shaft of the transmission mechanism 7. The driving gear 71 and the driven gear 431 mesh with each other, and the gear transmission Compared with other transmission mechanisms, the structure has the advantages of compact structure, small space occupation and long service life, especially suitable for substations with small spaces.

In this embodiment, the transmission mechanism 7 is a manual transmission mechanism. The manual transmission mechanism specifically adopts a hand wrench, and the hand wrench is connected to the lower rotating shaft 43. Turning the hand wrench can drive the lower rotating shaft 43, thereby driving the driving gear 71 in turn. 1. The driven gear 431 rotates, and then the slide bar 42 slides in the chute 41; in addition, the transmission mechanism 7 can also adopt an electric transmission mechanism as required. The electric transmission mechanism specifically includes a drive motor and a speed changer, and the drive motor passes through the speed changer and the driving gear. 71 is connected, the output end of the driving motor drives the driving gear 71 and the driven gear 431 to rotate successively after the output end of the drive motor outputs a low-speed high torque through the transmission, and then the slide bar 42 is made to slide in the chute 41, and its principle is the same as in this embodiment.

In this embodiment, a current transformer 8 is provided at the lower rotating shaft 43, and the current transformer 8 is connected to the remote dispatching system in the working state, so that the neutral point of the transformer in this embodiment can be displayed by using the existing remote dispatching system The output current of the grounding device of the comprehensive protection system, so that it is more convenient to know the grounding working state of this embodiment.

The working process of this embodiment is as follows: when the neutral point is not effectively grounded, the transmission mechanism 7 drives the lower conductive rod 4 to move to the lower left side through the lower rotating shaft 43, and the lower conductive rod 4 drives the sliding rod 42 in the chute through mechanical action. 41 slides upward, the insulating rod 6 drives the upper conductive rod 10 to rotate to the upper left side, so that the lower conductive rod 4 drives the lower contact 5 to move downward to the left, and the upper conductive rod 2 drives the upper contact 3 to move upward to the left, so that the upper conductive rod 2. The relative distance between the lower conductive rods 4 increases until the upper contact 3 and the lower contact 5 are separated in place, and the opening process is completed; when the neutral point is directly grounded, the transmission mechanism 7 drives the lower conductive rod 43 through the lower rotating shaft. The rod 4 moves to the upper right side, the lower conductive rod 4 drives the sliding rod 42 to slide downward in the chute 41 through mechanical action, and the insulating rod 6 drives the upper conductive rod 10 to rotate to the right, so that the lower conductive rod 4 drives the lower contact 5 moves to the right, the upper conductive rod 2 drives the upper contact 3 to move to the right, so that the relative distance between the upper conductive rod 2 and the lower conductive rod 4 decreases until the upper contact 3 and the lower contact 5 are in place, and the closing process Finish.

The above descriptions are only preferred implementations of the present invention, and the scope of protection of the present invention is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present invention belong to the scope of protection of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention should also be regarded as the protection scope of the present invention.

Claims (6)

1. a kind of earthing or grounding means of transformer neutral point Integrated Protection System, it is characterised in that：Including arrester connection end（1）、 Upper conducting rod（2）, upper contact head（3）, lower conducting rod（4）, lower contact（5）, insulated tension pole（6）And transmission mechanism（7）, described lightning-arrest Device connection end（1）It is mounted on the end of arrester, the upper conducting rod（2）One end be articulated with arrester connection end（1） On, and the upper contact head（3）It is located at upper conducting rod（2）The other end, the lower conducting rod（4）In be provided with chute（41）, described Chute（41）In be embedded with slide bar（42）, the lower contact（5）It is installed in lower conducting rod（4）One end, and the lower conducting rod （4）The other end by lower rotary shaft（43）It is fixed in the installation pedestal of arrester, the insulated tension pole（6）Cut with scissors one end Connect and be arranged in conducting rod（2）Side, other end hinge arrangement is in slide bar（42）Side, the transmission mechanism（7）Defeated Shaft and lower rotary shaft（43）It is connected.

2. the earthing or grounding means of transformer neutral point Integrated Protection System according to claim 1, it is characterised in that：Described exhausted Edge pull bar（6）By upper linkage section（61）, lower linkage section（62）With multiple insulators with umbrella skirt construction（63）Composition, and multiple Insulator（63）Linkage section is arranged in after joining end to end successively（61）, lower linkage section（62）Between.

3. the earthing or grounding means of transformer neutral point Integrated Protection System according to claim 1, it is characterised in that：Described keep away Thunder device connection end（1）End be provided with rotary shaft（11）, the upper conducting rod（2）One end be articulated with arrester connection end （1）Upper rotary shaft（11）On.

4. the earthing or grounding means of transformer neutral point Integrated Protection System according to claim 1, it is characterised in that：Under described Rotary shaft（43）On be arranged and be fixed with driven gear（431）, the transmission mechanism（7）Output shaft on be arranged with and be fixed with actively Gear（71）, the driving gear（71）And driven gear（431）Between be intermeshed.

5. the earthing or grounding means of transformer neutral point Integrated Protection System according to claim 1, it is characterised in that：The biography Motivation structure（7）For manual transmission or electric transmissio mechanism.

6. the earthing or grounding means of transformer neutral point Integrated Protection System according to claim 1, it is characterised in that：Under described Rotary shaft（43）Place is provided with current transformer（8）.