CN220401423U - Switching-on loop of breaker of high-voltage direct-current converter station - Google Patents
Switching-on loop of breaker of high-voltage direct-current converter station Download PDFInfo
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- CN220401423U CN220401423U CN202320732652.9U CN202320732652U CN220401423U CN 220401423 U CN220401423 U CN 220401423U CN 202320732652 U CN202320732652 U CN 202320732652U CN 220401423 U CN220401423 U CN 220401423U
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Abstract
The utility model belongs to the technical field of maintenance of a converter station, and particularly relates to a high-voltage direct-current converter station breaker closing loop, which is improved on the existing breaker closing loop and comprises a three-phase inconsistent loop. The switching-on coil is protected through the improved loop, and the switching-on loop can be disconnected to prevent the switching-on coil from being burnt out under the condition that the auxiliary contact does not act correctly.
Description
Technical Field
The utility model belongs to the technical field of maintenance of a converter station, and particularly relates to a switching-on loop of a breaker of a high-voltage direct-current converter station.
Background
Along with the continuous increase of the economy in China, the demand for electric power sources is increased, so that a (ultra) high-voltage direct-current transmission project with ultra-long-distance and ultra-large-scale power transmission capability is built vigorously. Compared with alternating current transmission, the high-voltage direct current transmission has the advantages of flexible transmission, low loss, capability of saving transmission corridor, capability of realizing quick control and the like. The system has the capabilities of point-to-point, ultra-long distance and high-capacity power transmission, and is mainly positioned at the ultra-long distance and ultra-large-capacity power transmission of southwest big hydropower stations and northwest big coal electric stations of China.
Along with the innovation of the electricity selling side, the requirements of the market of the electricity selling side and the actual conditions of various places are opened, the electricity selling main conditions meeting the requirements of technology, safety, environmental protection, energy conservation and social responsibility are scientifically defined, more and more clean energy sources are connected in a grid mode, power adjustment is more frequent in direct-current transmission, a high-voltage arc-extinguishing circuit breaker is an important part of a convertor station in (special) high-voltage direct-current transmission equipment, when the power is adjusted, a reactive power control system can cooperate with a reactive power adjustment amount automatic switching circuit breaker, frequent switching adjustment is a severe test on the normal operation of a switching circuit of the circuit breaker, and signal disconnection of switching of the circuit breaker in a main circuit is completed only by an auxiliary contact.
At present, the tripping reason of a certain transformer substation switch is that the switch A phase auxiliary switch Q1 is not switched in place, so that the position of the A phase is still separated after the switch is closed, the three-phase inconsistent relay of the switch body is tripped to B, C after being operated, and the A phase is not tripped (the auxiliary switch does not operate the operating mechanism to open the brake loop and is not conducted). Because the self-holding function is provided in the switching-on loop in the operation box, the switching-on loop is electrified for a long time to cause the damage of the A-phase switching-on coil.
The current switching-on loop has the following problems:
(1) After closing, the signal loop is disconnected only by the auxiliary switch Q1;
(2) The travel adjusting screw of the auxiliary switch with high operating life of the circuit breaker is too long, so that the auxiliary switch is not in place; (3) the signal duration exceeds 1 minute, the closing coil is burnt.
The reason that the closing coil burns out is that equipment operation life is higher and power adjustment is frequent for several years, and equipment ageing, the easy loose condition of different degree exist, for example the auxiliary switch department stroke adjusting screw of certain switch A looks Q1 exposes the screw thread and is 7 knot (normal looks is 5 knot), leads to stroke adjusting screw to be longer to influence auxiliary switch stroke variation, when the switch reaches the closing position, auxiliary switch can't shift into place.
Disclosure of Invention
The utility model aims to provide a switching-on loop of a high-voltage direct-current converter station breaker, which aims at solving the problems existing in the prior art, and the switching-on loop is protected by an improved loop, so that the switching-on loop can be disconnected to prevent the switching-on loop from being burnt out under the condition that an auxiliary contact does not act correctly.
The technical scheme of the utility model is as follows:
the improvement is carried out on the existing breaker closing circuit, the three-phase inconsistent circuit comprises a three-phase inconsistent circuit, the time delay action of a time relay KT4 of the three-phase inconsistent circuit is used for supplying power to a coil K5, a normally closed contact of the coil K5 is connected in series in the closing circuit, and the abnormal signal of the closing circuit is disconnected by utilizing the time delay of the KT 4.
Specifically, the three-phase inconsistent loop is that after the normally open auxiliary contact and the normally closed auxiliary contact of the A, B, C three-phase breaker auxiliary switch Q1 are respectively connected in parallel, the normally open auxiliary contact and the normally closed auxiliary contact are connected with the parallel normally open contact of the three-phase auxiliary switch Q1 in series, when the three-phase position of the breaker is inconsistent, the time relay KT4 acts and trips the three-phase breaker, then the normally open contact which is closed in a delayed mode is closed, the coil K5 is electrified, and the normally open contact which is electrified by the coil K5 is closed to trip.
Specifically, when A, B, C three phases are identical, the three-phase inconsistent loop is not conductive.
Specifically, the fixed value of the delay avoids the inherent action time of the single-phase reclosing time breaker.
The beneficial effects of the utility model are as follows: the circuit supplies power to the coil K5 through the delay action of the time relay KT4 of the three-phase inconsistent circuit, the normally closed contact of the coil K5 is connected in series in the switching-on circuit, abnormal signals of the switching-on circuit are disconnected through the delay of the KT4, the switching-on coil is protected, and the consumption of spare parts is reduced; the closing coil of the circuit breaker can be effectively protected, and the damage to equipment in the overhaul process is reduced; the maintenance time of the circuit breaker can be effectively reduced; the method can be applied to an alternating current filter field and can be widely applied to other direct current engineering.
Drawings
FIG. 1 is a schematic diagram of a three-phase inconsistent loop;
FIG. 2 is a schematic structural view of a spool;
fig. 3 is a schematic diagram of a closing circuit of a conventional circuit breaker.
Detailed Description
The technical scheme of the utility model is described in detail below with reference to the accompanying drawings. The closing circuit of the prior art circuit breaker, as shown in fig. 3, comprises: the switching device comprises a direct-current power supply, a change-over switch, a normally-closed contact of an anti-tripping relay, a normally-open contact of the anti-tripping relay, an anti-tripping relay coil, a normally-closed contact of a closing latching relay, a closing coil, a normally-closed contact of an auxiliary switch of a breaker and a normally-open contact of an auxiliary switch of the breaker; the positive electrode of the direct current power supply is connected with the normally-closed contact of the anti-tripping relay and the normally-open contact of the auxiliary switch of the breaker through the normally-open contact of the change-over switch, the other end of the normally-closed contact of the anti-tripping relay is connected with the closing coil through the normally-closed contact of the closing latching relay, the other end of the closing coil is connected with the normally-closed contact of the auxiliary switch of the first group of breaker, and the other end of the normally-closed contact of the auxiliary switch of the first group of breaker is connected with the negative electrode of the direct current power supply; the normally-closed contacts of the second group of the auxiliary switches of the circuit breakers are connected in parallel with the normally-closed contacts of the first group of the auxiliary switches of the circuit breakers; the other end of the normally open contact of the auxiliary switch of the breaker is connected with the negative electrode of the direct current power supply through an anti-jump relay coil; the normally open contact of the anti-jump relay is connected with the normally open contact of the auxiliary switch of the breaker in parallel; after the change-over switch is changed from a remote control position to a switching-on position, a normally open contact of the change-over switch is closed, the switching-on coil is connected with the direct current power supply, and the switching-on coil is powered on.
According to the utility model, the base of the switching-on loop of the circuit breaker in the prior art is improved, the time delay action of the time relay KT4 of the three-phase inconsistent loop is used for supplying power to the coil K5, the normally closed contact of the coil K5 is connected in series in the switching-on loop, and the abnormal signal of the switching-on loop is disconnected by utilizing the time delay of the KT 4.
The three-phase inconsistent loop is characterized in that normally open auxiliary contacts and normally closed auxiliary contacts of an auxiliary switch Q1 of a A, B, C three-phase circuit breaker are respectively connected in parallel and then connected with the parallel normally open contacts of the three-phase auxiliary switch Q1 in series, when the three-phase position of the circuit breaker is inconsistent, a time relay KT4 acts and trips the three-phase circuit breaker, then the normally open contacts which are closed in a delayed manner are closed, a coil K5 is electrified, and the normally open contacts which are electrified by the coil K5 are closed to trip.
Because the time relay of the three-phase inconsistent loop is used, if the A, B, C three-phase circuit breaker simultaneously generates the condition that the Q1 auxiliary switch cannot act correctly, the method cannot act correctly to disconnect the closing loop to protect the closing coil. Thus, calculation of the probability of correct motion is required to verify the improved accuracy described above.
Assuming that the probability of a fault when a single circuit breaker is switched on is x, the probability of a fault y when the operation is switched on (three circuit breakers are switched on simultaneously) is:
y=1- (1-single failure probability) 3 ＝1-(1-x) 3 (1)
Wherein three phases are not connected in parallel when simultaneously failedThe circle is correctly protected, and the probability of the condition is x 3 The probability z of correct action at the time of failure is:
and (3) carrying out preliminary calculation on the fault probability according to the number of times of switching actions of 2602 in the period of checking a certain station in one year, wherein the switching actions of the breaker are 248 times, and if x is 1/248, the number is substituted into a formula 2. The probability of correct action at failure z is about:
the following compares the other two improvements with the circuit proposed in this application:
scheme one: a time relay is additionally arranged in the operating mechanism, and the main circuit of the switch-on is opened in a delayed manner after the switch-on.
Scheme II: the self-holding loop in the operation box is modified, the A, B, C three-phase operation box self-holding device is changed into a time relay, and a normally open contact which is opened by instantaneous closing and delay is used as the self-holding contact.
Table 1 economic, reliability and plant condition comparison at the time of failure plant occurrence for three retrofit solutions
In combination with table 1, the present application is selected to protect the closing coil in view of economy, reliability and probability of correct protection of the coil.
The utility model discloses a high voltage direct current converter station circuit breaker closing circuit can effectively prevent to close a floodgate coil and damage when auxiliary switch trouble, reduces spare part consumption, can effectively reduce the maintenance time when such trouble appears, need not to install new components and parts, and the wiring is simple, reliable, easy to carry out, has reduced work load and time limit for a project to a great extent, and save time cost is favorable to improving the energy availability, in the work that follows, can carry out the differentiation fortune dimension to the longer circuit breaker of this kind of operation age, adds the specialized inspection of each month in going up.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical scheme of the present utility model and are not limiting; while the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present utility model or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the utility model, it is intended to cover the scope of the utility model as claimed.
Claims (4)
1. The circuit breaker switching-on loop of the high-voltage direct-current converter station is improved on the existing circuit breaker switching-on loop and comprises a three-phase inconsistent loop, and is characterized in that the time delay action of a time relay KT4 of the three-phase inconsistent loop is used for supplying power to a coil K5, a normally closed contact of the coil K5 is connected in series in the switching-on loop, and abnormal signals of the switching-on loop are disconnected by utilizing the time delay of the KT 4.
2. The circuit breaker closing circuit of the high-voltage direct-current converter station according to claim 1, wherein the three-phase inconsistent circuit is characterized in that normally open auxiliary contacts of an auxiliary switch Q1 of a A, B, C three-phase circuit breaker are respectively connected in parallel and then connected with parallel normally open contacts of the auxiliary switch Q1 of the three-phase circuit breaker in series, when the three-phase position of the circuit breaker is inconsistent, a time relay KT4 acts and trips the three-phase circuit breaker, the normally open contacts which are closed in a delayed manner are closed, a coil K5 is electrified, and the normally open contacts which are electrified by the coil K5 are closed for tripping.
3. The high voltage direct current converter station circuit breaker closing circuit of claim 2 wherein the three phase non-uniform circuit is non-conductive when A, B, C three phase states are uniform.
4. The high voltage direct current converter station circuit breaker closing circuit of claim 2 wherein the delay is fixed to avoid the single phase reclosing time circuit breaker intrinsic action time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320732652.9U CN220401423U (en) | 2023-04-03 | 2023-04-03 | Switching-on loop of breaker of high-voltage direct-current converter station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320732652.9U CN220401423U (en) | 2023-04-03 | 2023-04-03 | Switching-on loop of breaker of high-voltage direct-current converter station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220401423U true CN220401423U (en) | 2024-01-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320732652.9U Active CN220401423U (en) | 2023-04-03 | 2023-04-03 | Switching-on loop of breaker of high-voltage direct-current converter station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220401423U (en) |
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- 2023-04-03 CN CN202320732652.9U patent/CN220401423U/en active Active
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