CN204290291U - The automatically controlled thyristor excess voltage protection of a kind of extra-high voltage direct-current transmission - Google Patents
The automatically controlled thyristor excess voltage protection of a kind of extra-high voltage direct-current transmission Download PDFInfo
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- CN204290291U CN204290291U CN201420850899.1U CN201420850899U CN204290291U CN 204290291 U CN204290291 U CN 204290291U CN 201420850899 U CN201420850899 U CN 201420850899U CN 204290291 U CN204290291 U CN 204290291U
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Abstract
The utility model provides a kind of extra-high voltage direct-current transmission automatically controlled thyristor excess voltage protection, comprise comparator, thyristor gating circuit, gather high frequency sampling circuit and the power frequency sample circuit of thyristor both end voltage, be connected to after high frequency sampling circuit series damped electric capacity C1 and damping resistance R1 between thyristor anode and negative electrode, power frequency sample circuit the first divider resistance R2 and the second divider resistance R3 that connects is connected between thyristor anode and negative electrode, high frequency sampling circuit is all connected with comparator positive input with power frequency sample circuit, comparator reverse input end arranges protection threshold values, comparator output terminal is connected with thyristor gating circuit, thyristor gating circuit is connected with thyristor control pole, when circuit system is constant, protection magnitude of voltage declines along with the rising of voltage change ratio dv/dt, and available protecting thyristor is avoided puncturing because of false voltage under off-state.
Description
Technical field
The utility model relates to the automatically controlled thyristor excess voltage protection of a kind of extra-high voltage direct-current transmission.
Background technology
Due to the characteristic of thyristor itself, cause its off-state non-duplicate voltage not to be an invariable value, but decline along with the rising of voltage change ratio.In view of this reason, in the excess voltage protection of thyristor, protection magnitude of voltage also will decline along with the rising of voltage change ratio, otherwise will be easy to during overvoltage puncture thyristor.
Utility model content
The utility model provides the excess voltage protection of a kind of extra-high voltage direct-current transmission with automatically controlled thyristor, and available protecting thyristor is avoided puncturing because of false voltage under off-state.
For achieving the above object, the utility model by the following technical solutions:
The automatically controlled thyristor excess voltage protection of a kind of extra-high voltage direct-current transmission, comprise comparator, thyristor gating circuit, gather high frequency sampling circuit and the power frequency sample circuit of thyristor both end voltage, be connected to after high frequency sampling circuit series damped electric capacity C1 and damping resistance R1 between thyristor anode and negative electrode, power frequency sample circuit the first divider resistance R2 and the second divider resistance R3 that connects is connected between thyristor anode and negative electrode, high frequency sampling circuit is all connected with comparator positive input with power frequency sample circuit, comparator reverse input end arranges protection threshold values, comparator output terminal is connected with thyristor gating circuit, thyristor gating circuit is connected with thyristor control pole.
Further, between described high frequency sampling circuit and thyristor anode, be connected with electric capacity C2, between power frequency sample circuit and thyristor anode, be connected with resistance R4; High frequency sampling circuit is connected with comparator positive input after connecting electric capacity C2, is connected after power frequency sample circuit contact resistance R4 with comparator positive input.
Further, comprise obtain getting of voltage from thyristor two ends can circuit, get and can provide power supply for circuits for triggering by circuit.
Further, described first divider resistance R2 or the second divider resistance R3 adopts adjustable resistance.
Further, described comparator adopts triode.
The utility model extra-high voltage direct-current transmission excess voltage protection of automatically controlled thyristor; be applicable to extra-high voltage direct-current transmission ETT thyristor; this circuit is under power frequency; false voltage (exceeding the withstand voltage of thyristor during off-state) is after multilevel resistance dividing potential drop; the threshold value set with comparator is made comparisons; exceed threshold value by generation signal, drive circuits for triggering to produce thyristor triggering impulse, realize the object of protection thyristor.And during high frequency; system superposes a high frequency sampling circuit on the basis of power frequency sample circuit; voltage after superposition is made comparisons with the voltage threshold set in advance; higher than threshold value by generation signal; as the drive singal of thyristor gating circuit, thus under realizing high frequency state, protect the object of thyristor.The voltage that during high frequency, comparator positive input obtains is power frequency sampled voltage and high frequency sampled voltage sum; turn on thyristors is triggered in advance when high frequency voltage does not arrive comparator setting threshold values; be equivalent to reduce protection threshold values; when circuit system is constant, protection magnitude of voltage declines along with the rising of voltage change ratio dv/dt.
Further, circuit will directly use the voltage at thyristor two ends, and for circuits for triggering provide power supply, and do not need to increase external power source, structure is simple.
Further, when can not change circuit by the adjustable resistance in a sample circuit, the overvoltage threshold value of quick adjustment system.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the utility model protective circuit;
Fig. 2 is functional block diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail:
As shown in Figure 1, the automatically controlled thyristor excess voltage protection of extra-high voltage direct-current transmission of this practicality, comprise comparator, thyristor gating circuit, gather high frequency sampling circuit and the power frequency sample circuit of thyristor both end voltage, be connected to after high frequency sampling circuit series damped electric capacity C1 and damping resistance R1 between thyristor anode and negative electrode, power frequency sample circuit the first divider resistance R2 and the second divider resistance R3 that connects is connected between thyristor anode and negative electrode, high frequency sampling circuit is all connected with comparator positive input with power frequency sample circuit, comparator reverse input end arranges protection threshold values, comparator output terminal is connected with thyristor gating circuit, thyristor gating circuit is connected with thyristor control pole.
Further, between described high frequency sampling circuit and thyristor anode, be connected with electric capacity C2, between power frequency sample circuit and thyristor anode, be connected with resistance R4; High frequency sampling circuit is connected with comparator positive input after connecting electric capacity C2, is connected after power frequency sample circuit contact resistance R4 with comparator positive input.
Further, comprise obtain getting of voltage from thyristor two ends can circuit, get and can provide power supply for circuits for triggering by circuit.Described first divider resistance R2 or the second divider resistance R3 adopts adjustable resistance; This circuit is also provided with one in multilevel resistance bleeder circuit can the adjustable resistance of manual adjustments, also can conveniently regulate protection threshold value, thus ensure the precision of system overvoltage protection after control board completes.
Comparator adopts triode, and this circuit directly obtains voltage from thyristor two ends, for circuits for triggering provide power supply.By damping resistance and damping capacitor, be that timing starts to get energy in thyristor both end voltage, to ensure that circuits for triggering have enough energy to produce trigger impulse.
As shown in Figure 2; this circuit passes through multilevel resistance dividing potential drop Direct Sampling voltage when power frequency; high voltage is converted to low-voltage; again with arrange after protection threshold value make comparisons; if directly produce the drive singal of circuits for triggering higher than protection threshold value; and then generation trigger impulse, make turn on thyristors, reach the object of protection thyristor.And when high frequency, sample circuit not only comprises multilevel resistance bleeder circuit, also comprise the RC circuit that a damping capacitor C1 and damping resistance R1 forms, and for the electric capacity C2 of power frequency sampling resistor R4 parallel connection, when making protection threshold value constant, circuit is when high frequency sampling, the voltage that comparator positive input obtains is power frequency sampled voltage and high frequency sampled voltage sum, turn on thyristors is triggered in advance when high frequency voltage does not arrive comparator setting threshold values, be equivalent to reduce protection threshold values, the increase of sampling efficiency, thus reduce the grade of protection voltage, to reach the object of protection thyristor.
Claims (5)
1. the automatically controlled thyristor excess voltage protection of extra-high voltage direct-current transmission, it is characterized in that: comprise comparator, thyristor gating circuit, gather high frequency sampling circuit and the power frequency sample circuit of thyristor both end voltage, be connected to after high frequency sampling circuit series damped electric capacity C1 and damping resistance R1 between thyristor anode and negative electrode, power frequency sample circuit the first divider resistance R2 and the second divider resistance R3 that connects is connected between thyristor anode and negative electrode, high frequency sampling circuit is all connected with comparator positive input with power frequency sample circuit, comparator reverse input end arranges protection threshold values, comparator output terminal is connected with thyristor gating circuit, thyristor gating circuit is connected with thyristor control pole.
2. the automatically controlled thyristor excess voltage protection of extra-high voltage direct-current transmission according to claim 1, it is characterized in that: between described high frequency sampling circuit and thyristor anode, be connected with electric capacity C2, between power frequency sample circuit and thyristor anode, be connected with resistance R4; High frequency sampling circuit is connected with comparator positive input after connecting electric capacity C2, is connected after power frequency sample circuit contact resistance R4 with comparator positive input.
3. the automatically controlled thyristor excess voltage protection of extra-high voltage direct-current transmission according to claim 1, is characterized in that: comprise obtain getting of voltage from thyristor two ends can circuit, get and can provide power supply for circuits for triggering by circuit.
4. the automatically controlled thyristor excess voltage protection of extra-high voltage direct-current transmission according to claim 1, is characterized in that: described first divider resistance R2 or the second divider resistance R3 adopts adjustable resistance.
5. the automatically controlled thyristor excess voltage protection of extra-high voltage direct-current transmission according to claim 1, is characterized in that: described comparator adopts triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420850899.1U CN204290291U (en) | 2014-12-27 | 2014-12-27 | The automatically controlled thyristor excess voltage protection of a kind of extra-high voltage direct-current transmission |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420850899.1U CN204290291U (en) | 2014-12-27 | 2014-12-27 | The automatically controlled thyristor excess voltage protection of a kind of extra-high voltage direct-current transmission |
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| CN204290291U true CN204290291U (en) | 2015-04-22 |
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| CN201420850899.1U Active CN204290291U (en) | 2014-12-27 | 2014-12-27 | The automatically controlled thyristor excess voltage protection of a kind of extra-high voltage direct-current transmission |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106526446A (en) * | 2016-12-14 | 2017-03-22 | 云南电网有限责任公司电力科学研究院 | Testing circuit for thyristor level in high-voltage DC converter valve assembly |
| CN108011357A (en) * | 2017-12-26 | 2018-05-08 | 保定尤耐特电力科技有限公司 | A kind of thyristor string formation protective device and method |
| CN108718077A (en) * | 2018-05-25 | 2018-10-30 | 湖南省湘电试验研究院有限公司 | A kind of high-pressure thyristor triggering control and state monitoring apparatus and its application process |
| CN109085411A (en) * | 2018-08-22 | 2018-12-25 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of thyristor both end voltage change rate detection circuit |
| CN109270419A (en) * | 2017-07-14 | 2019-01-25 | 许继集团有限公司 | A kind of power supply device and detection system of the detection device of high-potential thyristor |
| CN116488112A (en) * | 2023-06-19 | 2023-07-25 | 北京燕能电气技术有限公司 | 10 kilovolt overhead line capacitor electricity-taking high-voltage protection circuit |
-
2014
- 2014-12-27 CN CN201420850899.1U patent/CN204290291U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106526446A (en) * | 2016-12-14 | 2017-03-22 | 云南电网有限责任公司电力科学研究院 | Testing circuit for thyristor level in high-voltage DC converter valve assembly |
| CN109270419A (en) * | 2017-07-14 | 2019-01-25 | 许继集团有限公司 | A kind of power supply device and detection system of the detection device of high-potential thyristor |
| CN108011357A (en) * | 2017-12-26 | 2018-05-08 | 保定尤耐特电力科技有限公司 | A kind of thyristor string formation protective device and method |
| CN108011357B (en) * | 2017-12-26 | 2019-04-05 | 保定尤耐特电力科技有限公司 | A kind of thyristor groups string protective device and method |
| CN108718077A (en) * | 2018-05-25 | 2018-10-30 | 湖南省湘电试验研究院有限公司 | A kind of high-pressure thyristor triggering control and state monitoring apparatus and its application process |
| CN109085411A (en) * | 2018-08-22 | 2018-12-25 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of thyristor both end voltage change rate detection circuit |
| CN109085411B (en) * | 2018-08-22 | 2021-06-25 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Circuit for detecting voltage change rate of two ends of thyristor |
| CN116488112A (en) * | 2023-06-19 | 2023-07-25 | 北京燕能电气技术有限公司 | 10 kilovolt overhead line capacitor electricity-taking high-voltage protection circuit |
| CN116488112B (en) * | 2023-06-19 | 2023-09-01 | 北京燕能电气技术有限公司 | 10 kilovolt overhead line capacitor electricity-taking high-voltage protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Xi'an Xidian Power System Co., Ltd. Assignor: China XD Electronic Corporation Contract record no.: 2015610000068 Denomination of utility model: Overvoltage protection circuit of electrically triggered thyristor for ultra-high-voltage direct-current power transmission Granted publication date: 20150422 License type: Exclusive License Record date: 20150701 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model |