CN101453119A - Passive damp resistance throw-cut device - Google Patents
Passive damp resistance throw-cut device Download PDFInfo
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- CN101453119A CN101453119A CNA2007101713167A CN200710171316A CN101453119A CN 101453119 A CN101453119 A CN 101453119A CN A2007101713167 A CNA2007101713167 A CN A2007101713167A CN 200710171316 A CN200710171316 A CN 200710171316A CN 101453119 A CN101453119 A CN 101453119A
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Abstract
The invention relates to a passive damping resistor switching device for controlling the switching of a damping resistor which arranged on a secondary side of a capacitance regulating or turn regulating extinguishing coil. The switching device consists of an alternating-current voltage detection circuit, a rectifier circuit, a voltage regulation and relay drive circuit and a direct current relay. In the device, neutral point voltage is detected by a voltage dependent resistor with high precision but without deviation in long-term work; acting voltage is higher than quit voltage without a critical area, so that the direct current relay does not act frequently; the rectifier circuit and the voltage regulator circuit are arranged to ensure reliable action and long service life of the direct current relay; and the neutral point voltage is both a detected object and a working power supply of a circuit, and a special working power supply is not required to be accessed, so that the system can be installed simply and improve reliability. The passive damping resistor switching device does not have complicated conditioning, acquisition and signal processing circuits, so that the cost of the system is low.
Description
Technical field
The present invention relates to a kind of medium voltage network arc suppression coil damped resistor switching device, particularly a kind of passive damp resistance throw-cut device that is used for the arc suppression coil secondary side.
Background technology
Accent circle or adjustable capacitive-based arc-suppression coil in the medium voltage network are generally operational near the resonance point, are the neutral point voltage superelevation of avoiding causing because of resonance, need equipped damping resistance.When electrical network single phase ground fault did not take place, damping resistance should be in running order, and when single-phase earthing took place, damping resistance should be in idle state.
The installation of damping resistance generally has dual mode.
Mode one: at arc suppression coil primary side series damping resistor, in this manner, when electrical network generation single-phase earthing, damping resistance is by short circuit.
Mode two: at arc suppression coil secondary side damping resistance in parallel, in this manner, when electrical network generation single-phase earthing, damping resistance is disconnected.
Because of the present invention is used for mode two, describe with regard to mode two below.The control structure of mode two as shown in Figure 2.Switching controller is controlled the break-make of K by the gate pole of control bidirectional triode thyristor K, thereby controls the switching of damping resistance.For the manner, the control logic of switching controller is when neutral point voltage surpasses threshold values, and the excision damping resistance when being lower than threshold values, drops into damping resistance.30% of the general power taking net of threshold values phase voltage.
Traditionally, damp resistance throw-cut device generally has two kinds of implementation methods:
A kind of method adopts CPU control.At first the voltage to neutral signal is nursed one's health, is sampled and calculates amplitude, then result of calculation and threshold values is compared, again by signal relay control silicon controlled break-make.This method and technology complexity, the cost height is installed trouble, needs special power supply.
Another kind method adopts overvoltage relay to measure neutral point voltage, control silicon controlled break-make.This method cost is low, but since ground connection when taking place the neutral point voltage excursion big, it is unreliable to work.
Summary of the invention
Purpose of the present invention is exactly to provide a kind of novel passive damp resistance throw-cut device for the defective that overcomes above-mentioned prior art existence, and it need not special power supply, and volume is little, and cost is low, and is easy for installation, reliable operation.
Purpose of the present invention can be achieved through the following technical solutions: a kind of passive damp resistance throw-cut device, it is characterized in that, and comprising:
Ac voltage detection circuit detects input voltage signal, and when instantaneous voltage surpassed threshold values, circuit turn-on, this circuit can detect two threshold voltages, determines current threshold values by the state that inserts switch;
Rectification circuit, this circuit and ac voltage detection circuit output link, and AC rectification is become direct current;
Voltage stabilizing and relay drive circuit, the output of this circuit and rectification circuit links, with output voltage stabilization within the specific limits to drive direct current relay;
Direct current relay, by the control of voltage stabilizing and relay drive circuit, its a pair of pin of often opening is linked in the ac voltage detection circuit, and as the switch that ac voltage detection circuit inserts, a pair of normally closed pin is as the output pin of this controller.
Described ac voltage detection circuit adopts piezo-resistance to detect threshold voltage, adopt controllable silicon as bidirectional triode thyristor as switching device.
Compared with prior art, the present invention adopts piezo-resistance to detect neutral point voltage, precision height, long-term work non-migration; Operation voltage is higher than and withdraws from voltage, no critical zone, and direct current relay can frequent movement; Have rectification and voltage stabilizing circuit, guaranteed the direct current relay reliable in action, the life-span is long; Neutral point voltage is that detected object is again a circuit work power, need not to insert special working power, and the system that makes installs simple, and reliability improves.Do not have complicated conditioning, collection and signal processing circuit, system cost is cheap.
Description of drawings
Fig. 1 is an electrical schematic diagram of the present invention;
Fig. 2 is a fundamental diagram of the present invention;
Fig. 3 is the voltage detecting circuit figure of the embodiment of the invention;
Fig. 4 is the voltage stabilizing and the relay drive circuit figure of the embodiment of the invention.
Embodiment
A kind of novel passive damp resistance throw-cut device comprises:
Ac voltage detection circuit, (this voltage signal can be scaled corresponding neutral point voltage signal to detect the arc suppression coil secondary side voltage signal of importing, thereby be equivalent to detect the neutral point voltage signal), when instantaneous voltage surpasses threshold values, this circuit turn-on, and remain to the input voltage instantaneous value and return zero.This circuit can detect two threshold voltages, specifically detects the switch control which threshold values is inserted by this circuit.Detection threshold 1 when switch opens, and detection threshold 2 when switch closure.This circuit adopts piezo-resistance to come detection threshold, adopts bidirectional triode thyristor as switching device.
Rectification circuit, this circuit and ac voltage detection circuit output link, and AC rectification is become direct current.
Voltage stabilizing and relay drive circuit, the output of this circuit and rectification circuit links, with output voltage stabilization within the specific limits to drive direct current relay.
Direct current relay, by the control of voltage stabilizing and relay drive circuit, its a pair of pin of often opening is linked in the ac voltage detection circuit, and as the switch that ac voltage detection circuit inserts, a pair of normally closed pin is as the output pin of this controller.
Should design the threshold values 1 of ac voltage detection circuit〉threshold values 2.
The course of work of this invention is as follows: originally, direct current relay is in non-action state, and at this moment the threshold values of ac voltage detection circuit is a threshold values 1.Afterwards sometime, the instantaneous value of input voltage has surpassed threshold values 1, causes the direct current relay action.At this moment the threshold values of ac voltage detection circuit is reduced to threshold values 2.This means that direct current relay will be in operate condition always as long as the input voltage peak value surpasses threshold values 2, promptly direct current relay withdraws from action in threshold values 1 action at threshold values 2.This means that also damping resistance in threshold values 1 excision, drops at threshold values 2.
Embodiment
The medium voltage network of 10KV, the arc suppression coil rated voltage that it uses is 6KV, and rated secondary voltage is 300V, and the no-load voltage ratio of a secondary side voltage is 20/1.10KV medium voltage network, phase voltage are 6KV, when neutral point voltage greater than phase voltage 30% the time, during promptly greater than 1800V, think that electrical network takes place by ground connection.At this moment the voltage that is converted to the arc suppression coil secondary side is 90V, and promptly crest voltage is 90 * 1.414=127V.
Now adopt voltage detecting circuit as shown in Figure 3.Wherein be the voltage signal of input between a, the x, insert switch between m, the l so that select the threshold voltage of current use.K1 is a controllable silicon, and R1, R2 are piezo-resistances, and D1 is a voltage-stabiliser tube, and R3, R4 are resistance.Selecting the pressure sensitive voltage of R1 is 127V, and the pressure sensitive voltage of R2 is 120V.When J1 opened, R1 was in running order like this, when J1 is closed, because of the pressure sensitive voltage of the R1 pressure sensitive voltage greater than R2, so R2 is in running order.Promptly when J1 opened, the threshold voltage of circuit was 127V, and when J1 was closed, the threshold voltage of circuit was 120V.
Rectification circuit generally adopts bridge rectifier, repeats no more here.
Voltage stabilizing and relay drive circuit should be noted that the coupling with direct current relay.Select the direct current relay of 48V/1W here for use, voltage stabilizing and relay drive circuit can design as shown in Figure 4 like this.
Claims (2)
1. a passive damp resistance throw-cut device is characterized in that, comprising:
Ac voltage detection circuit detects input voltage signal, and when instantaneous voltage surpassed threshold values, circuit turn-on, this circuit can detect two threshold voltages, determines current threshold values by the state that inserts switch;
Rectification circuit, this circuit and ac voltage detection circuit output link, and AC rectification is become direct current;
Voltage stabilizing and relay drive circuit, the output of this circuit and rectification circuit links, with output voltage stabilization within the specific limits to drive direct current relay;
Direct current relay, by the control of voltage stabilizing and relay drive circuit, its a pair of pin of often opening is linked in the ac voltage detection circuit, and as the switch that ac voltage detection circuit inserts, a pair of normally closed pin is as the output pin of this controller.
2. passive damp resistance throw-cut device according to claim 1 is characterized in that, described ac voltage detection circuit adopts piezo-resistance to detect threshold voltage, adopt controllable silicon as bidirectional triode thyristor as switching device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101713167A CN101453119B (en) | 2007-11-29 | 2007-11-29 | Passive damp resistance throw-cut device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101713167A CN101453119B (en) | 2007-11-29 | 2007-11-29 | Passive damp resistance throw-cut device |
Publications (2)
| Publication Number | Publication Date |
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| CN101453119A true CN101453119A (en) | 2009-06-10 |
| CN101453119B CN101453119B (en) | 2011-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007101713167A Expired - Fee Related CN101453119B (en) | 2007-11-29 | 2007-11-29 | Passive damp resistance throw-cut device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950958A (en) * | 2010-09-27 | 2011-01-19 | 思源电气股份有限公司 | Capacitance-adjusting type arc suppression coil complete device and operation mod of same |
| CN103023009A (en) * | 2012-12-28 | 2013-04-03 | 中国电力科学研究院 | Novel turn-adjustable switching device for secondary damping resistor of arc suppression coil |
| CN103383405A (en) * | 2013-07-10 | 2013-11-06 | 珠海许继芝电网自动化有限公司 | Passive signal voltage detection method |
| CN106385020A (en) * | 2016-11-24 | 2017-02-08 | 河北工业大学 | Quasi-zero transient switching damping resistor controller |
| CN107979082A (en) * | 2017-12-11 | 2018-05-01 | 国家电网公司 | The power network neutral point earthed system of controllable small resistor |
| CN110224405A (en) * | 2019-07-12 | 2019-09-10 | 威创集团股份有限公司 | The switching device and method of more power grids |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2306605Y (en) * | 1997-08-14 | 1999-02-03 | 张旭辉 | Excess current limiting wire-selecting apparatus for ground point of electric network |
| CN100405686C (en) * | 2004-07-08 | 2008-07-23 | 思源电气股份有限公司 | Combined automatic tracing arc extinction compensation and line selecting device |
| CN100502196C (en) * | 2007-06-14 | 2009-06-17 | 思源电气股份有限公司 | System for removing damp resistance discharging secondary arc-eliminating coil and its resonance |
-
2007
- 2007-11-29 CN CN2007101713167A patent/CN101453119B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950958A (en) * | 2010-09-27 | 2011-01-19 | 思源电气股份有限公司 | Capacitance-adjusting type arc suppression coil complete device and operation mod of same |
| CN101950958B (en) * | 2010-09-27 | 2013-04-17 | 思源电气股份有限公司 | Capacitance-adjusting type arc suppression coil complete device and operation mod of same |
| CN103023009A (en) * | 2012-12-28 | 2013-04-03 | 中国电力科学研究院 | Novel turn-adjustable switching device for secondary damping resistor of arc suppression coil |
| CN103383405A (en) * | 2013-07-10 | 2013-11-06 | 珠海许继芝电网自动化有限公司 | Passive signal voltage detection method |
| CN106385020A (en) * | 2016-11-24 | 2017-02-08 | 河北工业大学 | Quasi-zero transient switching damping resistor controller |
| CN107979082A (en) * | 2017-12-11 | 2018-05-01 | 国家电网公司 | The power network neutral point earthed system of controllable small resistor |
| CN110224405A (en) * | 2019-07-12 | 2019-09-10 | 威创集团股份有限公司 | The switching device and method of more power grids |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101453119B (en) | 2011-08-31 |
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Owner name: JIANGSU PINGYI ELECTRIC CO., LTD. Free format text: FORMER OWNER: SHANGHAI LANRUI SOFTWARE TECHNOLOGY CO., LTD. Effective date: 20131121 |
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Effective date of registration: 20131121 Address after: 226500 Jiangsu city of Rugao Province East Shore Community Group 9 Chen Zhen Xue Patentee after: Jiangsu folk Electric Co., Ltd. Address before: 200240, room 106, No. 755, Lane 101, Cangyuan Road, Shanghai, Minhang District Patentee before: Shanghai Lanrui Software Technology Co., Ltd. |
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