CN207488353U - A kind of current conversion station earthing pole enters ground cable current monitoring system - Google Patents
A kind of current conversion station earthing pole enters ground cable current monitoring system Download PDFInfo
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- CN207488353U CN207488353U CN201721366496.XU CN201721366496U CN207488353U CN 207488353 U CN207488353 U CN 207488353U CN 201721366496 U CN201721366496 U CN 201721366496U CN 207488353 U CN207488353 U CN 207488353U
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Abstract
The utility model provides a kind of current conversion station earthing pole and enters ground cable current monitoring system, the earthing pole of current conversion station enters ground cable grounding by least one, the system includes controller, and respectively enter ground cable and be connected with current transformer and lower current transformer in turn, the output terminal of upper current transformer and lower current transformer is connect with controller, and upper current transformer and lower current transformer are respectively wide range current transformer and small-range current transformer.When the size cases for the electric current for entering ground cable, select to be monitored to entering ground cable current using wide range current transformer or small-range current transformer.Either enter ground cable current it is excessive or it is too small can all ensure into ground cable current measurement accuracy, for current conversion station system it is subsequent analyze basis is provided.Meet the requirement of straight-flow system difference operating condition, the selection of current data is realized by way of switching and in line computation, monitored in order to which operations staff's remote online enters earthing pole ground cable current.
Description
Technical field
The utility model belongs to electric system technical field of HVDC transmission, and more particularly to current conversion station earthing pole enters ground electricity
Cable current monitoring system.
Background technology
In HVDC transmission system, for realize normal operation or during failure using the earth or seawater as current loop fortune
It goes and specially devises DC earthing electrode systems.Current conversion station of the prior art enters ground feeder line and the connection diagram of current conversion station is shown in
Shown in Fig. 1, current conversion station earthing pole is connect by several earth cables with the earth.Since the state of DC converter station earthing pole is non-
It is often important, the state of DC converter station earthing pole be directly related to DC transmission system can normal operation, therefore, current conversion station connects
Earth polar should carry out earth current measurement after being powered, and this measures work and should be carried out during the entire process of system debug,
To provide basic parameter for other every test jobs.
It is detected for the electric current to each feeder line of current conversion station earthing pole, conventional way is carried out manually in system test
It measures.Daily Round Check farther out, is being not easy to from current conversion station, and the monitoring needs of earth current carry since earthing pole is typically designed
A large amount of equipment could carry out.If there is any failure in feeder line, it is impossible to find and repair at the first time, in turn result in big
Safety accident.
Utility model content
The purpose of this utility model is to provide current conversion station earthing poles to enter ground cable current monitoring system, existing for solving
In technology current conversion station earthing pole enter ground cable current measurement result it is inaccurate the problem of.
A kind of current conversion station earthing pole enters ground cable current monitoring system, and the earthing pole of the current conversion station enters by least one
Ground cable grounding, the current conversion station earthing pole enter ground cable current monitoring system and include controller, and respectively enter on ground cable successively
It is connected with current transformer and lower current transformer, the output of the output terminal of the upper current transformer and lower current transformer
End is connect with the controller.
Further, the upper current transformer is the first Hall current mutual inductor.
Further, the lower current transformer is the second Hall current mutual inductor.
Further, the range of the upper current transformer is determined according to the design requirement for entering ground cable.
Further, the range of the lower current transformer is 50A.
The beneficial effects of the utility model are：
Current conversion station earthing pole provided by the utility model enters ground cable current monitoring system, and the earthing pole of current conversion station passes through extremely
Few one enters ground cable grounding, and current conversion station earthing pole enters ground cable current monitoring system and includes controller, and respectively enter on ground cable
It is connected with current transformer and lower current transformer in turn, the output terminal of the upper current transformer and lower current transformer
Output terminal is connect with the controller, wherein, upper current transformer is wide range current transformer, and lower current transformer is small
Range current transformer.The utility model enters the electric current of ground cable using two current transformers acquisition current conversion station earthing poles, when
Enter ground cable electric current it is excessive when, be monitored using wide range current transformer to entering ground cable current, when entering ground cable
When electric current is too small, it is monitored using small-range current transformer to entering ground cable current.It is excessive either to enter ground cable current
Or it is too small can all ensure into ground cable current measurement accuracy, for current conversion station system it is subsequent analyze basis is provided.Meet direct current
The requirement of system difference operating condition realizes the selection of current data and in line computation, in order to run by way of switching
Personnel's remote online enters earthing pole ground cable current and monitors.
Description of the drawings
Fig. 1 is the connection diagram that the current conversion station earthing pole of the prior art enters ground cable；
Fig. 2 flows to schematic diagram for grounding electrode electric current；
Fig. 3 is the connection diagram that the current conversion station earthing pole of the utility model enters ground cable；
Fig. 4 is the current data acquisition of the utility model and current value calculation flow chart.
Specific embodiment
Specific embodiment of the present utility model is further described below in conjunction with the accompanying drawings：
The utility model provides a kind of current conversion station earthing pole and enters ground cable current monitoring system, which changes for direct current
Stream station, as shown in figure 3, the earthing pole of the current conversion station enters ground cable grounding, the earthing pole of the DC converter station by least one
Enter ground cable current monitoring system and include controller, and respectively enter and be connected with current transformer and lower electric current in turn on ground cable
Mutual inductor, upper current transformer and lower current transformer are Hall current mutual inductor, and the output terminal of upper current transformer is under
The output terminal of current transformer is connect with controller, wherein upper current transformer is the current sensor far from ground in Fig. 3, under
Current transformer is close to the current sensor on ground in Fig. 3.
The upper current transformer of the present embodiment and lower current transformer are accessed into ground cable, it can be achieved that earthing pole enters ground cable
Reversal on-line monitoring, due to earthing pole characteristic determine, on same root feeder cable, the straight-flow system method of operation
Transformation, change of the grounding electrode electric current there are positive negative direction may be led to, as shown in Fig. 2, therefore, Hall current mutual inductor has
Measure the function of positive and negative DC current.
Under bipolar balance movement pattern, direct current grounding pole earth current is substantially zeroed, and in monopolar ground return pattern
Under, earthing pole total current is monopole rated current, and assumes that total monopole rated current is A amperes.The present embodiment is entered with 16
Illustrate for ground cable, be then assigned to electric current that each enters ground cable for A/16 amperes, but in use, enter ground
Cable may be damaged for some reason, cause into ground cable it is unavailable, therefore, single enter ground cable maximum current
5*A/16 amperes are set as, is satisfied with the requirement of DC converter station system.Due to the increase of Hall current mutual inductor range, can lead
Measurement accuracy is caused to decline, and the small current transformer of range enter ground cable current it is big in the case of, continuing monitoring current will lead
Element saturation is caused, therefore conventional Hall current mutual inductor cannot meet the detection requirement that current conversion station earthing pole enters ground cable current.
If selection accesses the current transformer of wide range into ground cable, if the current value for entering ground cable is excessive, then wide range
Current transformer is applicable, can detect more accurate cable current value；If it is too small to enter ground cable current value, then with greatly
The current value that the current transformer of range detects may be inaccurate, influences the correct acquisition of cable current value.
Therefore, enter on ground cable in earthing pole, be equipped with two sets of current transformers, wherein, a set of current transformer is a large amount of
Journey current transformer, another set of current transformer are small-range current transformer, and the range of wide range mutual inductor is corresponded into ground electricity
The maximum current of the setting of cable, the range of the current transformer of small-range is 50A, is calculating the occurrence into ground cable current
When, by switching wide range mutual inductor and small-range mutual inductor, the ampere-hour of ground cable current is then entered by integrating accumulation calculating
Number.As shown in figure 4, when in real time acquiring the electric current into ground cable, while using the current transformer and wide range of small-range
Current transformer is acquired into ground cable current, and the sampled value of note small-range current transformer is A, and wide range current transformer is adopted
Sample value is B, the sampled value of smaller range current transformer and the magnitude relationship of setting value, and the setting value of the present embodiment is 40A,
If the sampled value that small-range current transformer is obtained by judgement is less than 40A, controller takes adopting for small-range current transformer
Sample value is the current value into ground cable, if the sampled value that small-range current transformer is obtained by judgement is more than 40A, controller
The sampled value for taking wide range current transformer is the current value into ground cable, meets and is wanted into ground cable current measurement accuracy
It asks, the sampled value of the sampled value of small-range current transformer or wide range current transformer finally is sent to operation maintenance personnel carries out
In-service monitoring facilitates operation maintenance personnel to carry out subsequent analysis to current conversion station.
Specific embodiment is presented above, but the utility model is not limited to embodiment described above.This
The basic ideas of utility model are above-mentioned basic scheme, for those of ordinary skill in the art, according to the present utility model
Introduction, the model, formula, parameter for designing various modifications do not need to spend creative work.The utility model is not being departed from
Principle and spirit in the case of the guarantor of the utility model is still fallen within to the change, modification, replacement and modification that embodiment carries out
In the range of shield.
Claims (5)
1. a kind of current conversion station earthing pole enters ground cable current monitoring system, the earthing pole of the current conversion station enters ground by least one
Cable grounding, which is characterized in that the current conversion station earthing pole enters ground cable current monitoring system and includes controller, and respectively enter ground electricity
It is connected with current transformer and lower current transformer, the output terminal of the upper current transformer and lower Current Mutual Inductance on cable in turn
The output terminal of device is connect with the controller.
2. current conversion station earthing pole according to claim 1 enters ground cable current monitoring system, which is characterized in that described to power on
Current transformer is the first Hall current mutual inductor.
3. current conversion station earthing pole according to claim 1 enters ground cable current monitoring system, which is characterized in that the lower electricity
Current transformer is the second Hall current mutual inductor.
4. current conversion station earthing pole according to claim 1 or 2 enters ground cable current monitoring system, which is characterized in that described
The range of upper current transformer is determined according to the design requirement for entering ground cable.
5. current conversion station earthing pole according to claim 1 or 2 enters ground cable current monitoring system, which is characterized in that described
The range of lower current transformer is 50A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721366496.XU CN207488353U (en) | 2017-10-23 | 2017-10-23 | A kind of current conversion station earthing pole enters ground cable current monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721366496.XU CN207488353U (en) | 2017-10-23 | 2017-10-23 | A kind of current conversion station earthing pole enters ground cable current monitoring system |
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| CN207488353U true CN207488353U (en) | 2018-06-12 |
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| CN201721366496.XU Active CN207488353U (en) | 2017-10-23 | 2017-10-23 | A kind of current conversion station earthing pole enters ground cable current monitoring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109164387A (en) * | 2018-09-30 | 2019-01-08 | 国电南瑞南京控制系统有限公司 | Generator unit stator winding Injection Current measurement method based on big small-range CT |
-
2017
- 2017-10-23 CN CN201721366496.XU patent/CN207488353U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109164387A (en) * | 2018-09-30 | 2019-01-08 | 国电南瑞南京控制系统有限公司 | Generator unit stator winding Injection Current measurement method based on big small-range CT |
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