CN214479607U - Combined overvoltage limiter for AC metal closed switch cabinet - Google Patents
Combined overvoltage limiter for AC metal closed switch cabinet Download PDFInfo
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- CN214479607U CN214479607U CN202120708056.8U CN202120708056U CN214479607U CN 214479607 U CN214479607 U CN 214479607U CN 202120708056 U CN202120708056 U CN 202120708056U CN 214479607 U CN214479607 U CN 214479607U
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Abstract
A combined overvoltage limiter for an alternating current metal-enclosed switch cabinet comprises a first element, a second element and a third element, wherein a first conductive electrode is arranged in the first element and divides a first resistance sheet into an upper first resistance sheet and a lower first resistance sheet; a second conductive electrode is arranged in the second element and divides the second resistance sheet into an upper second resistance sheet and a lower second resistance sheet; a third conductive electrode is arranged in the third element and divides the third resistance sheet into an upper third resistance sheet and a lower third resistance sheet; a first conductive connecting piece electrically connected with the first conductive electrode and the second conductive electrode is arranged between the first conductive electrode and the second conductive electrode; and a second conductive connecting piece electrically connected with the second conductive electrode and the third conductive electrode is arranged between the second conductive electrode and the third conductive electrode. The method has the advantages of low failure rate, higher rated heat transfer charge value and rated heat energy value.
Description
Technical Field
The utility model belongs to the technical field of the middling pressure arrester, especially, relate to an exchange combination formula overvoltage limiter for metal enclosed switchgear.
Background
At present, overvoltage limiters used in metal closed switch cabinets of 3-35 kV alternating current power systems are mainly classified into five types, one type is a four-gap combined lightning arrester, wherein a neutral point has a large influence on a ground gap by a stray capacitor, and the protection is unstable and is prone to failure. The second type is a three-gap combined lightning arrester which eliminates neutral point grounding gaps, and experimental results show that the lightning arrester is effective for inhibiting inter-phase overvoltage and inter-phase overvoltage. However, as in the case of the four-gap combined type arrester, a deviation of the operating voltage is inevitable due to the existence of the gap. The third type is a parallel capacitance combined lightning arrester, and when overvoltage occurs, the discharge of a series gap of the parallel capacitance combined lightning arrester can take some time, even several times of reignition. The fourth type is a resistance-capacitance absorber, although the amplitude and gradient of the overvoltage can be reduced, and multiple restriking and overvoltage are inhibited. However, although the device has the disadvantages of large volume, high oil consumption, and the possibility of increasing the steady-state current to the ground, the limit level of the surge overvoltage with high amplitude is limited, and the requirement of system insulation cannot be met. The fifth type is a four-element gapless combined lightning arrester, which does not consider two-phase simultaneous overvoltage frequently occurred when the vacuum circuit breaker opens the inductive load, so that the impact load of the ground element is very large. In addition, the potential of the neutral point thereof changes during operation. In field tests, discharge sometimes occurs between the neutral point and ground. Therefore, when using such a protection device, attention should be paid to the insulation of the neutral point.
The overvoltage limiters (lightning arresters) for various types of metal closed switch cabinets have very high failure rate in actual operation, and heavy operation and maintenance workload and expensive frequent replacement cost are brought.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problems, the utility model provides a combined overvoltage limiter for an AC metal-enclosed switch cabinet with low failure rate for the society.
The technical scheme of the utility model is that: the combined overvoltage limiter comprises a first element, a second element and a third element which are connected in parallel, wherein the low-voltage ends of the first element, the second element and the third element are connected with a metal plate, the high-voltage ends of the first element, the second element and the third element can be respectively connected with an A phase, a B phase and a C phase of a power supply, a first conductive electrode is arranged between first resistance sheets in the first element, and the first resistance sheets are divided into an upper first resistance sheet and a lower first resistance sheet; a second conductive electrode is arranged between the second resistance cards in the second element, and the second resistance cards are divided into upper second resistance cards and lower second resistance cards; a third conductive electrode is arranged between third resistance sheets in the third element, and the third resistance sheets are divided into upper third resistance sheets and lower third resistance sheets; a first conductive connecting piece electrically connected with the first conductive electrode and the second conductive electrode is arranged between the first conductive electrode and the second conductive electrode; and a second conductive connecting piece electrically connected with the second conductive electrode and the third conductive electrode is arranged between the second conductive electrode and the third conductive electrode.
As an improvement of the present invention, the electrical parameters of the upper first resistance card, the upper second resistance card and the upper third resistance card are the same; the electrical parameters of the lower first resistance card, the lower second resistance card and the lower third resistance card are the same; the electrical parameters of the upper first resistance sheet and the lower first resistance sheet are the same or different; the electrical parameters of the upper second resistance sheet and the lower second resistance sheet are the same or different; and the electrical parameters of the upper third resistance sheet and the lower third resistance sheet are the same or different.
As an improvement to the present invention, the electrical parameters include a rated voltage, a continuous operating voltage, a power frequency reference voltage, a residual voltage, a rated repetitive transfer charge value, a rated thermal energy or a dielectric insulation tolerance value; or a combination of any two of a nominal voltage, a sustained operating voltage, a power frequency reference voltage, a residual voltage, a nominal repetitive transfer charge value, a nominal thermal energy, and a dielectric insulation withstand value.
As an improvement to the present invention, the first conductive connecting member is a first conductive rod or a first conductive strip.
As an improvement to the present invention, the second conductive connecting member is a third conductive rod or a third conductive strip.
As an improvement to the present invention, the first resistor disc, the second resistor disc and the third resistor disc are nonlinear metal oxide resistor discs.
As an improvement to the present invention, the nonlinear metal oxide resistor disc is a zinc oxide resistor disc.
As right the utility model discloses an it is right the improvement, the inside first resistance card of first component is through first insulating ring fixed connection, the whole high temperature silicon sulfide rubber vulcanization encapsulation that adopts of first component, the side direct bonding of silicon rubber and first resistance card.
As right the utility model discloses an improvement, the inside first resistance card of second component is through second insulating ring fixed connection, the whole encapsulation that adopts high temperature vulcanized silicone rubber vulcanization of second component, the side direct bonding of silicone rubber and second resistance card.
As right the utility model discloses an it is the improvement, the inside third resistance card of third component is through third insulating ring fixed connection, the whole high temperature vulcanized silicone rubber vulcanization encapsulation that adopts of third component, the side direct bonding of silicone rubber and first resistance card.
After the technical scheme of the utility model is adopted, when the overvoltage appears in the system, especially the two-phase same phase-between the ground operation overvoltage and the phase-between overvoltage that the inductive load appears is cut off to vacuum circuit breaker, this exchange metal enclosed switchgear with combination formula overvoltage limiter can both play fine overvoltage limiting and insulation protection effect. Particularly, the utility model solves the problem that the neutral point of the clearance structure has a larger influence on the ground clearance by the stray capacitor; secondly, the utility model solves the problem that the series gap discharge of the parallel capacitance type combined lightning arrester needs some time and even needs several times of reignition when the overvoltage occurs; thirdly, the utility model provides a though not bulky, the oil consumption of resistance-capacitance absorber big, to the ground steady state electric current shortcoming such as probably increase to solve the surge voltage limit of high amplitude, reach the requirement that satisfies the system insulation. Fourthly the utility model discloses consider the double-phase overvoltage simultaneously that often appears when vacuum circuit breaker opens inductive load, the impact load of its ground component is very big condition like this, and other ground components of quaternary element zero clearance combination formula arrester can't bear very big load, can take place to discharge sometimes between neutral point and the ground simultaneously, the utility model discloses also solve the insulating problem of neutral point.
Drawings
Fig. 1 is a schematic cross-sectional view of an embodiment of the present invention.
Fig. 2 is a schematic view of the sectional structure a-a of fig. 1.
Fig. 3 is a schematic circuit diagram of the embodiment shown in fig. 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 3, fig. 1 to 3 disclose a combined overvoltage limiter for an ac metal-enclosed switchgear, which includes a first element 1, a second element 2, and a third element 3 connected in parallel, wherein low voltage ends of the first element 1, the second element 2, and the third element 3 are connected to a metal plate 4, high voltage ends of the first element 1, the second element 2, and the third element 3 are respectively connected to phases a, B, and C of a power supply, a first conductive electrode 11 is disposed between first resistance sheets inside the first element 1, and the first resistance sheets are divided into an upper first resistance sheet 12 and a lower first resistance sheet 13; a second conductive electrode 21 is arranged between the second resistive sheets in the second element 2 to divide the second resistive sheets into an upper second resistive sheet 22 and a lower second resistive sheet 23; third conductive electrodes 31 are provided between the third resistive patches inside the third element 3, dividing the third resistive patches into upper third resistive patches 32 and lower third resistive patches 33; a first conductive connecting piece 14 electrically connected with the first conductive electrode 11 and the second conductive electrode 21 is arranged between the first conductive electrode 11 and the second conductive electrode 21; a second conductive connecting member 34 electrically connected to the second conductive electrode 21 and the third conductive electrode 31 is disposed between the second conductive electrode 21 and the third conductive electrode 31.
With the structure, the overvoltage limiter between the first element 1 and the second element 2 is composed of the upper first resistance sheet 12 and the upper second resistance sheet 22; an overvoltage limiter is formed by an upper first resistance sheet 12 and an upper third resistance sheet 32, wherein the first element 1 and the third element 3 are alternated; the second element 2 and the third element 3 are inter-phase overvoltage limiters consisting of an upper second resistive sheet 22 and an upper third resistive sheet 32. The phase-ground overvoltage limiter of the first element 1 consists of an upper first resistance card 12, a lower first resistance card 13, a lower second resistance card 23 and a lower third resistance card 33; the phase-ground overvoltage limiter of the second element 2 is composed of an upper second resistance sheet 22, a lower first resistance sheet 13, a lower second resistance sheet 23 and a lower third resistance sheet 33; the upper third resistive patch 32, the lower first resistive patch 13, the lower second resistive patch 23 and the lower third resistive patch 33 form a phase-ground overvoltage limiter of the third element.
The utility model discloses overvoltage limiter is when the double-phase overvoltage that appears simultaneously of restriction, and the common component between looks-ground participates in impact current's the discharge jointly, belongs to the parallelly connected reposition of redundant personnel technique of three posts, can tolerate the energy impact that is higher than 3 times of ordinary quaternary element combination formula arrester. The three-column parallel element between the phase and the ground does not adopt the structure of a common four-element combined lightning arrester (arranged in an insulated and packaged shell), but adopts an independent three-column structure, and has more excellent heat dissipation property and short-circuit current resistance property.
The utility model discloses the overvoltage limiter does not adopt series gap technique, thereby has overcome because the influence that neutral point to ground clearance received stray capacitor causes the problem of protection unstability, easy trouble. Meanwhile, the problem that the gap is easy to burn and damage due to strong current impact resistance is also solved.
In the utility model, the high-voltage end of each element is led out by the insulated wire 5. The connection portion of the insulated wire 5 to each component is shielded with an insulating cover 6. The terminal 7 of the insulated wire 5 is a crimped copper terminal. The three elements are fixed to a metal mounting plate 4. Thereby forming a complete whole. Three mounting threaded holes 8 are reserved at the bottom of the whole overvoltage limiter and used for mounting the limiter in a switch cabinet.
Preferably, the electrical parameters of the upper first resistive sheet 12, the upper second resistive sheet 22 and the upper third resistive sheet 32 are the same; the electrical parameters of the lower first resistive sheet 13, the lower second resistive sheet 23 and the lower third resistive sheet 33 are the same; the electrical parameters of the upper first resistive sheet 12 and the lower first resistive sheet 13 are the same or different; the electrical parameters of the upper second resistive sheet 22 and the lower second resistive sheet 23 are the same or different; the electrical parameters of the upper third resistive sheet 32 and the lower third resistive sheet 33 are the same or different.
Preferably, the electrical parameter comprises a rated voltage, a continuous operation voltage, a power frequency reference voltage, a residual voltage, a rated repeated transfer charge value, a rated heat energy or a dielectric insulation tolerance value; or a combination of any two of a nominal voltage, a sustained operating voltage, a power frequency reference voltage, a residual voltage, a nominal repetitive transfer charge value, a nominal thermal energy, and a dielectric insulation withstand value.
Preferably, the first conductive connector 14 is a first conductive rod or a first conductive sheet.
Preferably, the second conductive connector 34 is a third conductive rod or a third conductive strip.
Preferably, the first, second and third resistive patches are non-linear metal oxide resistive patches. The nonlinear metal oxide resistor disc is a zinc oxide resistor disc.
Preferably, the first resistance sheet in the first element 1 is fixedly connected through a first insulating ring 15, the whole first element 1 is vulcanized and packaged by high-temperature vulcanized silicone rubber, and the silicone rubber 16 is directly bonded with the side surface of the first resistance sheet.
Preferably, the first resistance card inside the second element 2 is fixedly connected through a second insulating ring 25, the second element 2 is integrally vulcanized and packaged by high-temperature vulcanized silicone rubber, and the silicone rubber 26 is directly bonded with the side surface of the second resistance card.
Preferably, the third resistance sheet in the third element 3 is fixedly connected through a third insulating ring 35, the whole third element 3 is vulcanized and packaged by high-temperature vulcanized silicone rubber, and the silicone rubber 36 is directly bonded with the side surface of the first resistance sheet.
Each element of the overvoltage limiter of the utility model is fixed by an insulating ring (LOOP). All the elements are integrally vulcanized and packaged by high-temperature vulcanized silicone rubber (HTV), and the silicone rubber is directly bonded with the side surface of the resistor disc. The high-current impact resistant and short-circuit current resistant alloy has more excellent high-current impact resistance and short-circuit current resistant characteristics.
The utility model discloses overvoltage limiter can realize compacter installation space, can satisfy the miniaturized development requirement day by day of metal enclosed switchgear.
The combined overvoltage limiter for the ac metal-enclosed switchgear and the conventional four-element combined lightning arrester were tested at Un =10kV, and the results shown in tables 1 and 2 were obtained.
Table 1 electrical parameters of a conventional four-element combined lightning arrester (e.g. Un =10 kV)
Table 2 electrical parameters of the combined overvoltage limiter for a switchgear cabinet (for example: Un =10 kV) according to the present invention
It can be seen from the above-mentioned technical parameters, compare with conventional quaternary combined arrester, the utility model provides an exchange metal enclosed switchgear with combination formula overvoltage limiter has apparent ability of tolerating repeated transfer charge, has higher rated heat transfer charge value and rated heat energy value. Therefore, the phase-phase overvoltage and the phase-ground overvoltage between two phases at the same time have good limiting effect.
All equivalent changes made by the contents of the specification and the drawings of the utility model are included in the scope of the claims of the utility model without departing from the idea of the utility model.
Claims (7)
1. A combined overvoltage limiter for an alternating current metal-enclosed switchgear comprises a first element (1), a second element (2) and a third element (3) which are connected in parallel, wherein the low-voltage ends of the first element (1), the second element (2) and the third element (3) are connected with a metal plate (4), and the high-voltage ends of the first element (1), the second element (2) and the third element (3) are respectively connected with an A phase, a B phase and a C phase, and is characterized in that: a first conductive electrode (11) is arranged between the first resistance sheets in the first element (1) and divides the first resistance sheets into an upper first resistance sheet (12) and a lower first resistance sheet (13); a second conductive electrode (21) is arranged between the second resistance sheets in the second element (2) and divides the second resistance sheets into an upper second resistance sheet (22) and a lower second resistance sheet (23); third conductive electrodes (31) are arranged between the third resistance sheets in the third element (3) to divide the third resistance sheets into upper third resistance sheets (32) and lower third resistance sheets (33); a first conductive connecting piece (14) electrically connected with the first conductive electrode (11) and the second conductive electrode (21) is arranged between the first conductive electrode (11) and the second conductive electrode (21); and a second conductive connecting piece (34) electrically connected with the second conductive electrode (21) and the third conductive electrode (31) is arranged between the second conductive electrode (21) and the third conductive electrode (31).
2. The combined overvoltage limiter for ac metal enclosed switchgear according to claim 1, wherein: the electrical parameters of the upper first resistance sheet (12), the upper second resistance sheet (22) and the upper third resistance sheet (32) are the same; the electrical parameters of the lower first resistance card (13), the lower second resistance card (23) and the lower third resistance card (33) are the same; the electrical parameters of the upper first resistance sheet (12) and the lower first resistance sheet (13) are the same or different; the electrical parameters of the upper second resistance sheet (22) and the lower second resistance sheet (23) are the same or different; the electrical parameters of the upper third resistive sheet (32) and the lower third resistive sheet (33) are the same or different.
3. The combined overvoltage limiter for ac metal enclosed switchgear according to claim 1 or 2, wherein: the first conductive connector (14) is a first conductive rod or a first conductive strip.
4. The combined overvoltage limiter for ac metal enclosed switchgear according to claim 1 or 2, wherein: the second conductive connector (34) is a third conductive rod or a third conductive strip.
5. The combined overvoltage limiter for ac metal enclosed switchgear according to claim 1 or 2, wherein: the first resistor disc in the first element (1) is fixedly connected through a first insulating ring (15), the first element (1) is integrally vulcanized and packaged by high-temperature vulcanized silicone rubber, and the silicone rubber is directly bonded with the side face of the first resistor disc.
6. The combined overvoltage limiter for ac metal enclosed switchgear according to claim 1 or 2, wherein: the first resistor disc in the second element (2) is fixedly connected through a second insulating ring (25), the second element (2) is integrally vulcanized and packaged through high-temperature vulcanized silicone rubber, and the silicone rubber is directly bonded with the side face of the second resistor disc.
7. The combined overvoltage limiter for ac metal enclosed switchgear according to claim 1 or 2, wherein: the third resistor disc in the third element (3) is fixedly connected through a third insulating ring (35), the third element (3) is integrally vulcanized and packaged through high-temperature vulcanized silicon rubber, and the silicon rubber is directly bonded with the side face of the first resistor disc.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120708056.8U CN214479607U (en) | 2021-04-08 | 2021-04-08 | Combined overvoltage limiter for AC metal closed switch cabinet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120708056.8U CN214479607U (en) | 2021-04-08 | 2021-04-08 | Combined overvoltage limiter for AC metal closed switch cabinet |
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| CN214479607U true CN214479607U (en) | 2021-10-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113067313A (en) * | 2021-04-08 | 2021-07-02 | 厦门Abb 避雷器有限公司 | Combined overvoltage limiter for AC metal closed switch cabinet |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113067313A (en) * | 2021-04-08 | 2021-07-02 | 厦门Abb 避雷器有限公司 | Combined overvoltage limiter for AC metal closed switch cabinet |
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