CN210467536U - Transformer low pressure neutral point copper bar connection structure - Google Patents
Transformer low pressure neutral point copper bar connection structure Download PDFInfo
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- CN210467536U CN210467536U CN201921557478.9U CN201921557478U CN210467536U CN 210467536 U CN210467536 U CN 210467536U CN 201921557478 U CN201921557478 U CN 201921557478U CN 210467536 U CN210467536 U CN 210467536U
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Abstract
The utility model discloses a transformer low pressure neutral point copper bar connection structure, include: the first copper bar, the second copper bar, the phase line A, the phase line B, the phase line C and the neutral line; a first connecting point, a second connecting point and a third connecting point are sequentially arranged in the length direction of the first copper bar; a fourth connecting point, a fifth connecting point and a sixth connecting point are sequentially arranged in the length direction of the second copper bar, the resistance value between the fourth connecting point and the fifth connecting point is equal to 1.5 times of the resistance value between the first connecting point and the second connecting point, and the resistance value between the fifth connecting point and the sixth connecting point is equal to 0.5 times of the resistance value between the first connecting point and the second connecting point; the phase line A is electrically connected with the third connecting point; the B phase line is electrically connected with the second connection point; the C phase line is electrically connected with the first connecting point; the neutral line is electrically connected with the fifth connection point, so that the risk of the over-tolerance of the low-voltage direct-current resistance is reduced.
Description
Technical Field
The utility model relates to a transformer technical field, concretely relates to transformer low pressure neutral point copper bar connection structure.
Background
Referring to fig. 1, currently, a neutral point copper bar of a transformer of 1000KWA or more is one, four connection points a, d, B, and C are sequentially arranged in the length direction of the copper bar, and the resistances of ab and bc are equal, the resistances of bd and ad are equal, phase line a 01 is electrically connected to the connection point a, phase line B02 is electrically connected to the connection point B, phase line C03 is electrically connected to the connection point C, and neutral line 04 is electrically connected to the connection point d, defining the resistance of ad as 1.5R, the resistances of bd and ad are both 0.5R, the sum of the resistances of ad, bd, and cd divided by 3 is the average resistance value of the neutral point copper bar connection structure, calculating the average resistance value of the neutral point copper bar connection structure as 0.67R, the difference between the maximum resistance value and the minimum resistance value divided by the average resistance value is the maximum resistance value of the connection structure, calculating the maximum resistance value of the connection structure as 1.5, when the maximum resistance value is higher, the low-voltage dc resistance is often caused by an over, therefore, a new connection structure is needed to further reduce the resistance worst value.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned technique not enough, provide a transformer low pressure neutral point copper bar connection structure, further reduce the resistance worst value.
In order to achieve the technical purpose, the technical scheme of the utility model provide a transformer low pressure neutral point copper bar connection structure, include:
the first copper bar, the second copper bar, the phase line A, the phase line B, the phase line C and the neutral line;
a first connecting point, a second connecting point and a third connecting point are sequentially arranged in the length direction of the first copper bar, and the resistance value between the first connecting point and the second connecting point is equal to the resistance value between the second connecting point and the third connecting point;
a fourth connecting point, a fifth connecting point and a sixth connecting point are sequentially arranged in the length direction of the second copper bar, the resistance value between the fourth connecting point and the fifth connecting point is equal to 1.5 times of the resistance value between the first connecting point and the second connecting point, the resistance value between the fifth connecting point and the sixth connecting point is equal to 0.5 times of the resistance value between the first connecting point and the second connecting point, the fourth connecting point is electrically connected with the first connecting point, and the sixth connecting point is electrically connected with the third connecting point;
the phase line A is electrically connected with the third connecting point;
the B phase line is electrically connected with the second connection point;
the C phase line is electrically connected with the first connecting point;
the neutral line is electrically connected to the fifth connection point.
Compared with the prior art, the beneficial effects of the utility model include: in the transformer low-voltage neutral point copper bar connecting structure, the resistance value between the first connecting point and the second connecting point is equal to the resistance value between the second connecting point and the third connecting point, the resistance value between the fourth connecting point and the fifth connecting point is equal to 1.5 times of the resistance value between the first connecting point and the second connecting point, the resistance value between the fifth connecting point and the sixth connecting point is equal to 0.5 times of the resistance value between the first connecting point and the second connecting point, the resistance value between the second connecting point and the third connecting point is r if the resistance value between the first connecting point and the second connecting point is defined as r, the resistance value between the fourth connecting point and the fifth connecting point is 1.5r, the resistance value between the fifth connecting point and the sixth connecting point is 0.5r, and two ends of the first copper bar are connected with two ends of the second copper bar in parallel, namely, the first connection point and the third connection point are respectively and electrically connected with the fourth connection point and the sixth connection point, the resistance value between the first connection point and the fourth connection point is negligible, the resistance value between the third connection point and the sixth connection point is also negligible, the resistance value between the third connection point and the fifth connection point is 0.44r, the resistance value between the second connection point and the fifth connection point is 0.47r, the resistance value between the first connection point and the fifth connection point is 0.94r, the resistance value between the third connection point and the fifth connection point, the resistance value between the second connection point and the fifth connection point, and the sum of the resistance values between the first connection point and the fifth connection point divided by 3 are the average resistance value of the transformer low-voltage neutral point copper bar connection structure, and the average resistance value of the transformer low-voltage neutral point copper bar connection structure is calculated to be 0.62r, the difference between the maximum resistance value and the minimum resistance value is divided by the average resistance value to obtain the resistance worst value of the transformer low-voltage neutral point copper bar connecting structure, and the calculated resistance worst value of the transformer low-voltage neutral point copper bar connecting structure is 0.81 and is close to the half value of the prior art, so that the risk of the out-of-tolerance of the low-voltage direct-current resistance is reduced.
Drawings
Fig. 1 is a schematic diagram of a neutral point copper bar connection structure of a transformer in the background art.
Fig. 2 is the structural schematic diagram of the first embodiment of the transformer low-voltage neutral point copper bar connection structure provided by the utility model.
Fig. 3 is a schematic structural diagram of a second embodiment of the transformer low-voltage neutral point copper bar connection structure provided by the utility model.
Fig. 4 is an internal structure schematic diagram of the heat dissipation plug provided by the present invention.
Fig. 5 is a schematic end face structure diagram of the heat dissipation plug provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further 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 and fig. 2, the present embodiment provides a transformer low-voltage neutral point copper bar connection structure, including: the device comprises a first copper bar 1, a second copper bar 2, a phase line A3, a phase line B4, a phase line C5 and a neutral line 6.
The length direction of the first copper bar 1 is sequentially provided with a first connection point 1a, a second connection point 1b and a third connection point 1c, and the resistance between the first connection point 1a and the second connection point 1b is equal to the resistance between the second connection point 1b and the third connection point 1 c.
A fourth connection point 2a, a fifth connection point 2b and a sixth connection point 2c are sequentially arranged in the length direction of the second copper bar 2, the resistance between the fourth connection point 2a and the fifth connection point 2b is equal to 1.5 times of the resistance between the first connection point 1a and the second connection point 1b, the resistance between the fifth connection point 2b and the sixth connection point 2c is equal to 0.5 times of the resistance between the first connection point 1a and the second connection point 1b, the fourth connection point 2a is electrically connected with the first connection point 1a, and the sixth connection point 2c is electrically connected with the third connection point 1c, in this embodiment, the first copper bar 1 and the second copper bar 2 are identical in length, width, thickness and material, and the first copper bar 1 and the second copper bar 2 are formed by equivalent copper bar cross-section size in the background technology, the length and the width of the copper bar in the background technology are the same as those of the first copper bar 1, and the thickness of the copper bar in the background technology is equal to twice of the thickness of the first copper bar 1, so that the copper bar is convenient for technical personnel to reform.
The A phase line 3 with the third tie point 1C electricity is connected, and is concrete, accessible soldering welded fastening, the B phase line 4 with the second tie point 1B electricity is connected, and is concrete, accessible soldering welded fastening, the C phase line 5 with first tie point 1a electricity is connected, and is concrete, accessible soldering welded fastening, neutral conductor 6 with the fifth tie point 2B electricity is connected, and is concrete, accessible soldering welded fastening.
In this embodiment, a preferable embodiment is further provided, and the electrical connection positions are all fixed by welding with metallic silver.
In the transformer low-voltage neutral point copper bar connection structure, the resistance value between the first connection point 1a and the second connection point 1b is equal to the resistance value between the second connection point 1b and the third connection point 1c, the resistance value between the fourth connection point 2a and the fifth connection point 2b is equal to 1.5 times of the resistance value between the first connection point 1a and the second connection point 1b, the resistance value between the fifth connection point 2b and the sixth connection point 2c is equal to 0.5 times of the resistance value between the first connection point 1a and the second connection point 2b, the resistance value between the first connection point 1a and the second connection point 1b is defined as r, the resistance value between the second connection point 1b and the third connection point 1c is defined as r, the resistance value between the fourth connection point 2a and the fifth connection point 2b is defined as 1.5r, the resistance value between the fifth connection point 2b and the sixth connection point 2c is 0.5r, two ends of the first copper bar 1 are connected in parallel with two ends of the second copper bar 2, that is, the first connection point 1a and the third connection point 1c are respectively electrically connected with the fourth connection point 2a and the sixth connection point 2c, the resistance value between the first connection point 1a and the fourth connection point 2a can be ignored, the resistance value between the third connection point 1c and the sixth connection point 2c can also be ignored, specifically, the first connection point 1a and the fourth connection point 2a are directly fixed by silver soldering, the third connection point 1c and the sixth connection point 2c are directly fixed by silver soldering, so that the resistance value between the third connection point 1c and the fifth connection point 2b can be 0.44r, and the resistance value between the second connection point 1b and the fifth connection point 2b is 0.47r, the resistance value between the first connecting point 1a and the fifth connecting point 2b is 0.94r, the sum of the resistance value between the third connecting point 1c and the fifth connecting point 2b, the resistance value between the second connecting point 1b and the fifth connecting point 2b, and the resistance value between the first connecting point 1a and the fifth connecting point 2b divided by 3 is the average resistance value of the transformer low-voltage neutral point copper bar connecting structure, the average resistance value of the transformer low-voltage neutral point copper bar connecting structure is calculated to be 0.62r, the difference between the maximum resistance value and the minimum resistance value divided by the average resistance value is the minimum resistance value of the transformer low-voltage neutral point copper bar connecting structure, the minimum resistance value of the transformer low-voltage neutral point copper bar connecting structure is calculated to be 0.81, and is close to the half value of the prior art, and therefore the risk of low-voltage direct current resistance over-difference is reduced.
Referring to fig. 3, 4 and 5, the embodiment further provides a preferred embodiment, the transformer low-voltage neutral point copper bar connection structure further includes a heat dissipation plug 7 and a heat dissipation fin 8, a cooling cavity 7a is disposed in the heat dissipation plug 7, insulating oil is disposed in the cooling cavity 7a, an oil inlet pipe 7b communicated with the cooling cavity 7a is disposed on one side of the heat dissipation plug 7, and an oil outlet pipe 7c communicated with the cooling cavity 7a is disposed on the other side of the heat dissipation plug 7; a first clamping groove 7d and a second clamping groove 7e which are arranged up and down are arranged on the same side of the heat dissipation plug 7, the first clamping groove 7d is clamped at one end of the first copper bar 1, the second clamping groove 7e is inserted at one end of the second copper bar 2, two heat dissipation fins 8 are arranged in the first clamping groove 7d and the second clamping groove 7e, the same end of each of the two heat dissipation fins 8 in the first clamping groove 7d is clamped on the first copper bar 1, the same end of each of the two heat dissipation fins 8 in the second clamping groove 7e is clamped on the second copper bar 2, and the other end of each of the heat dissipation fins 8 extends to the cooling cavity 7a, so that the heat dissipation fins 8 bring the heat of the first copper bar 1 and the heat of the second copper bar 2 into the cooling cavity 7a, the heat dissipation efficiency is improved, and all the heat dissipation fins 8 are not in contact with each other in the embodiment, the mutual insulation state is kept, specifically, the radiating fins 8 are made of beryllium bronze and have elasticity, so that the radiating fins 8 are in contact with the first copper bar 1 or the second copper bar 2 more tightly, and the radiating plug 7 is made of ABS plastic.
The above description of the present invention does not limit the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the scope of the claims of the present invention.
Claims (2)
1. The utility model provides a transformer low pressure neutral point copper bar connection structure which characterized in that includes:
the first copper bar, the second copper bar, the phase line A, the phase line B, the phase line C and the neutral line;
a first connecting point, a second connecting point and a third connecting point are sequentially arranged in the length direction of the first copper bar, and the resistance value between the first connecting point and the second connecting point is equal to the resistance value between the second connecting point and the third connecting point;
a fourth connecting point, a fifth connecting point and a sixth connecting point are sequentially arranged in the length direction of the second copper bar, the resistance value between the fourth connecting point and the fifth connecting point is equal to 1.5 times of the resistance value between the first connecting point and the second connecting point, the resistance value between the fifth connecting point and the sixth connecting point is equal to 0.5 times of the resistance value between the first connecting point and the second connecting point, the fourth connecting point is electrically connected with the first connecting point, and the sixth connecting point is electrically connected with the third connecting point;
the phase line A is electrically connected with the third connecting point;
the B phase line is electrically connected with the second connection point;
the C phase line is electrically connected with the first connecting point;
the neutral line is electrically connected to the fifth connection point.
2. The transformer low-voltage neutral point copper bar connecting structure according to claim 1, further comprising a heat dissipation plug and a heat dissipation fin, wherein a cooling cavity is formed in the heat dissipation plug, insulating oil is arranged in the cooling cavity, an oil inlet pipe communicated with the cooling cavity is arranged on one side of the heat dissipation plug, and an oil outlet pipe communicated with the cooling cavity is arranged on the other side of the heat dissipation plug; the radiating plug is characterized in that a first clamping groove and a second clamping groove which are arranged up and down are formed in the same side of the radiating plug, the first clamping groove is clamped at one end of the first copper bar, the second clamping groove is inserted at one end of the second copper bar, two radiating fins are arranged in the first clamping groove and the second clamping groove, the same end of each radiating fin in the first clamping groove is clamped on the first copper bar, the same end of each radiating fin in the second clamping groove is clamped on the second copper bar, and the other end of each radiating fin extends to the cooling cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921557478.9U CN210467536U (en) | 2019-09-18 | 2019-09-18 | Transformer low pressure neutral point copper bar connection structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921557478.9U CN210467536U (en) | 2019-09-18 | 2019-09-18 | Transformer low pressure neutral point copper bar connection structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210467536U true CN210467536U (en) | 2020-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921557478.9U Active CN210467536U (en) | 2019-09-18 | 2019-09-18 | Transformer low pressure neutral point copper bar connection structure |
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| Country | Link |
|---|---|
| CN (1) | CN210467536U (en) |
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2019
- 2019-09-18 CN CN201921557478.9U patent/CN210467536U/en active Active
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