CN205160044U - Transformer neutral point DC dump appearance hinders device - Google Patents
Transformer neutral point DC dump appearance hinders device Download PDFInfo
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- CN205160044U CN205160044U CN201520883128.7U CN201520883128U CN205160044U CN 205160044 U CN205160044 U CN 205160044U CN 201520883128 U CN201520883128 U CN 201520883128U CN 205160044 U CN205160044 U CN 205160044U
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- neutral point
- transformer
- direct current
- transformer neutral
- eliminated
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Abstract
The utility model discloses a transformer neutral point DC dump appearance hinders device, including four parallel branch s of setting in the box, quick bypass return circuit, capacitor bank and a series resistance branch road, the bypass switch branch road and second resistance and mechanical switch series branch, the box still includes electric current monitor and digital controller. This DC dump appearance hinders the device and under the transformer neutral point DC dump appearance hinders device normal operating and the maintenance condition, can both realize dc magnetic biasing improvement and direct current, alternating current monitor function, and the scheme is simple reliable moreover, and it is convenient to maintain, suits to popularize and apply.
Description
Technical field
The utility model relates to a kind of transformer neutral point direct current and eliminates appearance resistance device.
Background technology
Along with the expansion of high voltage direct current transmission scale, its adverse effect produced also manifests appearance gradually, particularly when high-voltage direct current monopolar operation or bipolar transmission power unbalanced operation, the earth has direct current to flow through, cause surface potential near current conversion station that larger change occurs, make periphery 110kV and above transformer neutral point have direct current to enter, thus cause the vibrations aggravation of transformer, noise increase, oil temperature to rise, cause transformer DC magnetic bias problem.
Transformer neutral point direct current is eliminated appearance resistance device and is formed in parallel by Capacitor banks and resistant series branch road, resistance, fast bypass-loop, by-pass switch, mechanical switch, is connected between transformer neutral point and earth mat.Flow through transformer neutral point there is no direct current or flow through direct current when not exceeding limit value; by-pass switch is in open position, mechanical switch is in closing position; resistance loop is linked into transformer neutral point; when there is short trouble to transformer neutral point direct current and system, short circuit current suppresses; prevent transformer core from occurring DC magnetic bias phenomena because direct current affects; restriction system short-circuit current simultaneously, the safety of protection transformer and relevant device.When detecting that the direct current flowing through transformer neutral point exceedes limit value, by-pass switch transfers open position to, mechanical switch is in open position makes Capacitor banks and resistant series branch road drop into, and plays the effect eliminating direct current.
Utility model content
The purpose of this utility model is the shortcoming solving above-mentioned transformer neutral point direct current Treatment process, provides a kind of transformer neutral point direct current to eliminate and holds resistance device.
The technical solution adopted in the utility model is:
A kind of transformer neutral point direct current is eliminated and is held resistance device, comprise four parallel branches be arranged in casing, fast bypass-loop, Capacitor banks and the first resistant series branch road, by-pass switch branch road and the second resistance and mechanical switch series arm, casing also comprises current surveillance instrument and digitial controller;
Described fast bypass-loop is used for the fast quick-recovery transformer grounding when system malfunctions, and protection transformer and transformer neutral point direct current are eliminated and held resistance equipment safety reliability service;
Described fast bypass-loop is composed in series by power electronic device and low induction reactance big current reactor;
Described Capacitor banks and the first resistant series branch road are used for the elimination to transformer neutral point DC current;
Described Capacitor banks is that some capacitors are in parallel;
Described capacitor is made up of the noninductive winding of self-healing metalized film, adopts stainless steel casing, has capacitance greatly, in length of life capacitance fall lower than 2 percentage points, long service life;
Described first resistance is made up of graphite, has that volume is little, withstand shock electric current is large, the strong feature of heat-resisting ability, for the suppression to transformer neutral point DC current;
Described first resistance is some resistive module connection in series-parallel;
Described by-pass switch branch road recovers transformer metallic ground when being used for system malfunctions, and protection transformer and transformer neutral point direct current are eliminated and held resistance equipment safety reliability service;
Described mechanical switch is used for the switching of the first resistance;
Described current surveillance instrument comprises current transformer, voltage transformer, for measuring transformer electricity-linkingup point electric current, voltage;
Described digitial controller is for controlling fast bypass-loop, by-pass switch and mechanical switch deciliter.
In order to better realize the utility model, described Capacitor banks and the first resistant series are installed in metal framework, and metal framework is fixed in casing by insulator.
In order to better realize the utility model, in described current surveillance instrument, current transformer is installed on the turnover line end of device, voltage transformer and Capacitor banks and the first resistant series branch circuit parallel connection.
In order to better realize the utility model, described Capacitor banks and the first resistant series adopt hard busbar to be connected, and ensure that link is solid and reliable.
In order to better realize the utility model, described first resistance is suppressed by graphite and is formed, and resistance is adjustable.
In order to better realize the utility model, described power electronic device is made up of rectifier diode and Thyristors in series, and rectifier diode crimps as a whole with thyristor.
In order to better realize the utility model, described low induction reactance reactor adopts resin casting dry-type air core reactor.
In order to better realize the utility model, described low induction reactance reactor is fixing adopts insulated tension pole.
In order to better realize the utility model, the thyristor in described fast bypass-loop is triggered by controller and piezo-resistance hardware trigger is formed.
Transformer neutral point direct current is eliminated and is held resistance device by judging to flow through the size of transformer neutral point DC current, realize the conversion of this device between resistance or capacity earth state, thus transformer neutral point DC current is suppressed or excludes, adopt transformer neutral point direct current to eliminate to hold resistance device not only Appropriate application electric-resistivity method and capacitance method advantage but also avoid the shortcoming of both sides.
Transformer neutral point direct current elimination appearance resistance device employing fast bypass-loop of the present utility model and by-pass switch form protective loop during system short-circuit fault; not only utilize the power electronic device response time soon but also make use of by-pass switch and continue the strong advantage of logical big current ability and form and reasonably protect step, solve power electronic device and continue slow weakness logical big current ability more weak and by-pass switch operate time.
Transformer neutral point direct current of the present utility model is eliminated and is held Capacitor banks and the first resistant series that resistance device adopts large capacitance; the voltage being applied to Capacitor banks and the first resistant series loop during system short-circuit is low; adopt fast bypass-loop and by-pass switch as protecting bypass simultaneously; response time is fast, therefore transformer neutral point direct current elimination appearance resistance device can not need to adopt discharging gap to protect Capacitor banks and the first resistant series branch road.Low-voltage makes transformer neutral point direct current eliminate the reduction of appearance resistance device insulating requirements simultaneously, reduces the volume of device, makes installation more flexible and changeable.
Compared with prior art, tool has the following advantages and beneficial effect the utility model:
This direct current is eliminated and is held resistance device and eliminate at transformer neutral point direct current and hold resistance device and normally to run and in maintenance situation, D.C. magnetic biasing can both be realized administer and direct current, monitoring alternating current function, and scheme is simple and reliable, easy to maintenance, be suitable for applying.
Accompanying drawing explanation
Fig. 1 is that a kind of transformer neutral point direct current described in the utility model eliminates the logic diagram holding resistance device.
Reference numeral:
1 is low sense current limiting reactor, and 2 is power electronic device module, and 3 is Capacitor banks, and 4 is voltage transformer, and 5 is by-pass switch, and 6 is the second resistance, and 7 is mechanical switch, and 8 is digitial controller, and 9 is current surveillance instrument, and 10 is the first resistance
Embodiment
Below in conjunction with embodiment and accompanying drawing, execution mode of the present utility model is described in further detail, but execution mode of the present utility model is not limited thereto.
Embodiment 1
As shown in Figure 1, a kind of transformer neutral point direct current is eliminated and is held resistance device, comprise four parallel branches be arranged in casing, the fast bypass-loop that power electronic device 2 and low induction reactance big current reactor 1 are composed in series, Capacitor banks 3 and the first resistance 10 series arm, by-pass switch 5 branch road and the second resistance 6 and mechanical switch 7 series arm, casing also comprises current surveillance instrument 9 and digitial controller 8;
Described fast bypass-loop is used for the fast quick-recovery transformer grounding when system malfunctions, and protection transformer and transformer neutral point direct current are eliminated and held resistance equipment safety reliability service;
Described Capacitor banks 3 and the first resistance 10 series arm are used for the elimination to transformer neutral point DC current;
Described Capacitor banks 3 is that some capacitors are in parallel;
Described capacitor is made up of the noninductive winding of self-healing metalized film, adopts stainless steel casing, has capacitance greatly, in length of life capacitance fall lower than 2 percentage points, long service life;
Described first resistance 10 is made up of graphite, has that volume is little, withstand shock electric current is large, the strong feature of heat-resisting ability, for the suppression to transformer neutral point DC current;
Described first resistance 10 is some resistive module connection in series-parallel;
Described by-pass switch 5 branch road recovers transformer metallic ground when being used for system malfunctions, and protection transformer and transformer neutral point direct current are eliminated and held resistance equipment safety reliability service;
Described mechanical switch 7 is for the switching of the first resistance 10;
Described current surveillance instrument comprises current transformer 9, voltage transformer 4, for measuring transformer electricity-linkingup point electric current, voltage;
Described digitial controller 8 is for controlling fast bypass-loop, by-pass switch 5 and mechanical switch 7 deciliters.
In order to better realize the utility model, described Capacitor banks 3 and the first resistance 10 are installed in series in metal framework, and metal framework is fixed in casing by insulator.
In order to better realize the utility model, in described current surveillance instrument, current transformer 9 is installed on the turnover line end of device, and voltage transformer 4 is in parallel with Capacitor banks 3 and the first resistance 10 series arm.
In order to better realize the utility model, described Capacitor banks 3 and the first resistance 10 are connected and are adopted hard busbar to be connected, and ensure that link is solid and reliable.
In order to better realize the utility model, described first resistance 10 is suppressed by graphite and is formed, and resistance is adjustable.
In order to better realize the utility model, described power electronic device 2 is made up of rectifier diode and Thyristors in series, and rectifier diode crimps as a whole with thyristor.
Claims (8)
1. a transformer neutral point direct current is eliminated and is held resistance device, it is characterized in that: comprise four parallel branches be arranged in casing, fast bypass-loop, Capacitor banks and the first resistant series branch road, by-pass switch branch road and the second resistance and mechanical switch series arm, casing also comprises current surveillance instrument and digitial controller;
Described fast bypass-loop is composed in series by power electronic device and low induction reactance big current reactor;
Described Capacitor banks is that some capacitors are in parallel;
Described first resistance is some resistive module connection in series-parallel;
Described current surveillance instrument comprises current transformer, voltage transformer;
Described digitial controller is for controlling fast bypass-loop, by-pass switch and mechanical switch deciliter.
2. a kind of transformer neutral point direct current according to claim 1 is eliminated and is held resistance device, it is characterized in that: described Capacitor banks and the first resistant series are installed in metal framework, and metal framework is fixed in casing by insulator.
3. a kind of transformer neutral point direct current according to claim 1 is eliminated and is held resistance device, it is characterized in that: in described current surveillance instrument, current transformer is installed on the turnover line end of device, voltage transformer and Capacitor banks and the first resistant series branch circuit parallel connection.
4. a kind of transformer neutral point direct current according to claim 1 is eliminated and is held resistance device, it is characterized in that: described Capacitor banks and the first resistant series adopt hard busbar to be connected, and ensures that link is solid and reliable.
5. a kind of transformer neutral point direct current according to claim 1 is eliminated and is held resistance device, and it is characterized in that: described power electronic device is made up of rectifier diode and Thyristors in series, rectifier diode crimps as a whole with thyristor.
6. a kind of transformer neutral point direct current according to claim 1 is eliminated and is held resistance device, it is characterized in that: described low induction reactance reactor adopts resin casting dry-type air core reactor.
7. a kind of transformer neutral point direct current according to claim 1 is eliminated and is held resistance device, it is characterized in that: described low induction reactance reactor is fixing adopts insulated tension pole.
8. a kind of transformer neutral point direct current according to claim 1 is eliminated and is held resistance device, it is characterized in that: the thyristor in described fast bypass-loop is triggered by controller and piezo-resistance hardware trigger is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520883128.7U CN205160044U (en) | 2015-11-05 | 2015-11-05 | Transformer neutral point DC dump appearance hinders device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520883128.7U CN205160044U (en) | 2015-11-05 | 2015-11-05 | Transformer neutral point DC dump appearance hinders device |
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| Publication Number | Publication Date |
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| CN205160044U true CN205160044U (en) | 2016-04-13 |
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| CN201520883128.7U Active CN205160044U (en) | 2015-11-05 | 2015-11-05 | Transformer neutral point DC dump appearance hinders device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105391028A (en) * | 2015-11-05 | 2016-03-09 | 国网四川省电力公司电力科学研究院 | Neutral-point direct-current elimination resistance-capacitance device of transformer and method |
-
2015
- 2015-11-05 CN CN201520883128.7U patent/CN205160044U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105391028A (en) * | 2015-11-05 | 2016-03-09 | 国网四川省电力公司电力科学研究院 | Neutral-point direct-current elimination resistance-capacitance device of transformer and method |
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