CN202503288U - Occasion structure of direct current transmission system - Google Patents
Occasion structure of direct current transmission system Download PDFInfo
- Publication number
- CN202503288U CN202503288U CN2012201164202U CN201220116420U CN202503288U CN 202503288 U CN202503288 U CN 202503288U CN 2012201164202 U CN2012201164202 U CN 2012201164202U CN 201220116420 U CN201220116420 U CN 201220116420U CN 202503288 U CN202503288 U CN 202503288U
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- transmission system
- loop
- direct current
- occasion
- resistance
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Abstract
The utility model relates to an occasion structure of a direct current transmission system. The occasion structure comprises grounding resistances, a variable resistance and a wire connection resistance which are sequentially connected to form a loop, wherein the grounding resistances are arranged at two ends of the loop. Compared with the prior art, the occasion structure of the direct current transmission system provided by the utility model is simple in structure and is capable of conveniently carrying out simulated operation on a grounding circuit, and preventing ground current from entering the circuit through a neutral point of a directly grounded transformer and then going downward to the ground through a neutral point at the other end to from a direct current loop to cause damage on electronic components.
Description
Technical field
The utility model relates to a kind of DC transmission system, especially relates to a kind of occasion structure of DC transmission system.
Background technology
When DC transmission system adopted bipolar symmetrical operation or monopole metallic loop operational mode, positive and negative two overhead transmission lines constituted the loop.Yet when system overhaul, debugging or certain bar circuit broke down, system need switch to the one pole operational mode, and promptly the fault-free metallic circuit is with constituting the loop operation greatly.The electric field that these direct currents wandering in ground produce will form different potential on the face of land and distribute because the both positive and negative polarity of system flows into respectively and flows out the direct current up to several kilo-amperes this moment.The alternating electromotive force equipment ground part that is in this current field scope will no longer be a zero potential, but along with the far and near difference apart from direct current grounding pole has different potential.
When amplitude up to the direct current of several kiloamperes after earth electrode gets into the earth; The part of electric current maybe be through the neutral point of direct grounding transformer in the ground; Via the transmission line of alternation current; Flow to the neutral grounded transformer of the circuit other end, and click and enter ground, thereby form DC loop through the neutrality of this transformer.This direct current that flows through the two ends transformer will inevitably cause the transformer core magnetization curve asymmetric, thereby it is saturated to aggravate magnetic flux unshakable in one's determination.Magnetic flux is saturated not only can to cause transformer vibration, noise etc. obviously to increase, and may cause that iron core, bolt, shell etc. are overheated, serious words even cause that transformer damages.
The utility model content
The purpose of the utility model is exactly the occasion structure that a kind of DC transmission system simple in structure, easy to use is provided in order to overcome the defective that above-mentioned prior art exists.
The purpose of the utility model can realize through following technical scheme:
A kind of occasion structure of DC transmission system, this occasion structure comprise that earth resistance, variable resistor and lead connect resistance, and described earth resistance, variable resistor and lead connect resistance and be in turn connected to form the loop, and earth resistance is located at the two ends in loop.
Described earth resistance place is provided with the potential difference measurement appearance, is used to detect the potential difference between two earth resistances.
Described variable resistor is the resistance of regulating loop electric current.
Compared with prior art; The utility model is simple in structure; Can make things convenient for to such an extent that earthed circuit is carried out simulated operation, prevent that electric current in the ground from getting into circuit through the neutral point of directly grounded transformer, the neutrality through the other end forms DC loop with clicking and entering and causes the destruction to electronic devices and components again.
Description of drawings
Fig. 1 is the structural representation of the utility model;
Fig. 2 is the schematic diagram of the utility model.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is elaborated.
Embodiment
A kind of occasion structure of DC transmission system, its structure is as shown in Figure 1, and this occasion structure comprises that earth resistance 1, variable resistor 2 and lead connect resistance 3.Wherein earth resistance 1, variable resistor 2 and lead connection resistance 3 are in turn connected to form the loop; Earth resistance 1 is located at the two ends in loop; Variable resistor 2 is the resistance of regulating loop electric current, and 1 place is provided with potential difference measurement appearance 4 at earth resistance, is used to detect the potential difference between two earth resistances 1.
The principle of the utility model is as shown in Figure 2; Through earthed circuit is carried out simulated operation; Prevent that electric current in the ground from getting into circuit through the neutral point of directly grounded transformer 5, the neutrality through the other end forms DC loop with clicking and entering and causes the destruction to electronic devices and components again.
Claims (3)
1. the occasion structure of a DC transmission system; It is characterized in that; This occasion structure comprises that earth resistance, variable resistor and lead connect resistance, and described earth resistance, variable resistor and lead connect resistance and be in turn connected to form the loop, and earth resistance is located at the two ends in loop.
2. the occasion structure of a kind of DC transmission system according to claim 1 is characterized in that, described earth resistance place is provided with the potential difference measurement appearance.
3. the occasion structure of a kind of DC transmission system according to claim 1 is characterized in that, described variable resistor is the resistance of regulating loop electric current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201164202U CN202503288U (en) | 2012-03-26 | 2012-03-26 | Occasion structure of direct current transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201164202U CN202503288U (en) | 2012-03-26 | 2012-03-26 | Occasion structure of direct current transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202503288U true CN202503288U (en) | 2012-10-24 |
Family
ID=47039889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201164202U Expired - Lifetime CN202503288U (en) | 2012-03-26 | 2012-03-26 | Occasion structure of direct current transmission system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202503288U (en) |
-
2012
- 2012-03-26 CN CN2012201164202U patent/CN202503288U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121024 |
|
| CX01 | Expiry of patent term |