CN111025069B - Method for testing constant value of cold control power-off time of transformer cooler - Google Patents
Method for testing constant value of cold control power-off time of transformer cooler Download PDFInfo
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Abstract
The invention provides a method for testing the fixed value of the cold control power-off time of a transformer cooler, which comprises the steps of triggering a first preset circuit connection condition after a testing environment is ready, enabling a cold control power-off power supply loop, a cold control power-off control loop and a cold control power-off time fixed value setting logic circuit to be connected, and obtaining the time length from the triggering to the tripping of a cold control power-off fixed delay device to calculate the delay fixed value of a time relay on the cold control power-off control loop; if the delay fixed value of the time relay is not 0, the delay fixed value is adjusted to be 0, then a second preset circuit connection condition is continuously triggered, and the time from the triggering to the tripping of the cold control power-off delay relay is obtained to calculate the delay fixed value of the cold control power-off delay relay; if the delay fixed value of the cold control power-off delay relay is less than or equal to the setting time, the delay fixed value reaches the standard; otherwise, the regulation is needed when the standard is not reached. By implementing the method, the cold control power-off time fixed value of the transformer cooler is effectively monitored and ensured to be less than or equal to the setting time of the full stop of the transformer cooler.
Description
Technical Field
The invention relates to the technical field of transformer testing, in particular to a method for testing the fixed value of cold control power-off time of a transformer cooler.
Background
Fig. 1 is a schematic diagram of the external primary side wiring of the transformer. This transformer links to each other through three side circuit breaker 1DL, 2DL, 3DL combined floodgates and corresponding isolator 1G, 2G, 3G and different generating lines respectively and realizes the vary voltage power supply, however in case the oil temperature can rise fast after the transformer is inside to break down, if the fault phenomenon and the time maintenance of cutting off all coolers also appear in cooling system this moment for a long time, then can lead to the transformer to seriously damage.
According to DL/T572-95 Power Transformer operating regulations: and when all coolers are cut off due to faults of a cooling system, the transformer is allowed to operate for 20min with rated load. If the top oil temperature has not reached 75 ℃ after 20min, the temperature is allowed to rise to 75 ℃, but the maximum time for operating in this state must not exceed 60 min. Therefore, it is necessary to study the principle of cold-controlled power loss of the transformer cooler.
In the prior art, as shown in fig. 2 to 4, there are respectively operation schematic diagrams of a transformer cooler cold control power-off power supply loop, a control loop and a time fixed value setting logic circuit. Assuming that I, II groups of power conversion handles SS in fig. 2 are set in the first group of power supply to work (when the first group of power supply works, the contacts are on, and the contacts are off), the 380V power supply can pass through the normally closed contact KMJ2 of the ac contactor KMS2 (at this time, the excitation coil of the ac contactor KMS2 is demagnetized) and the excitation coil of the ac contactor KMS1 (at this time, the ac contactor KMS1 is excited and started, and the normally closed contact KMJ1 is opened); then, the manual switch ST in fig. 3 is turned on (i.e., turned on during operation), and the normally open contacts QF1, QF2 and QF3 corresponding to the three-side circuit breakers 1DL, 2DL and 3DL are respectively turned on due to the three-side circuit breakers 1DL, 2DL and 3DL of the transformer in fig. 1 being turned on, so that the normally open contact KJ of the intermediate relay K in fig. 3 is turned on by excitation. However, due to some reason (such as short circuit, aging, etc.), neither the ac contactor KMS1 nor the ac contactor KMS2 in fig. 2 can work (or the 380V power supply trips and loses power), so that the normally closed contact KMJ1 of the ac contactor KMS1 and the normally closed contact KMJ2 of the ac contactor KMS2, which are serially connected with the normally open contact KJ of the intermediate relay K in fig. 3, are both turned on, the current flows into the time relay KT11 (with 20min delay function) and starts to time, and the time delay relay KT11 reaches a delay fixed value (20min), so that the cooler full stop outlet intermediate relay K11 is excited and started. Once the cooler full-stop outlet intermediate relay K11 is excited to close the normally open contact KJ11 in fig. 4, and the oil temperature sensing contact POP (temperature sensing >75 degrees closed) in fig. 4 is closed, and the control words SW9 (cold control power-off delay 60-minute trip control word), SW8 (cold control power-off via oil temperature high lockout control word) and SW7 (cold control power-off protection input control word) are all placed at corresponding positions, the transformer cooler cold control power-off full-stop work is started to be ready, and the cold control power-off trip relay LKSDTZ acts to complete outlet trip to open the main-transformer three-side circuit breakers 1DL, 2DL and 3 DL.
However, field workers are often unfamiliar with the fixed value of the cold control power-off time (for example, the cold control power-off delay relay TLKSD can be set to 60min delay and the time relay KT11 can be set to 20min delay), so that the setting time (60min) of the transformer cooler full stop is often exceeded during switching operation of the control words SW 7-SW 9, and the three-side circuit breakers 1DL, 2DL and 3DL are not tripped or delayed to trip during operation under the high temperature of the transformer for a long time, so that potential safety hazards of transformer temperature rise, ignition, explosion and the like are caused. For example, when a worker is put into operation, the control word SW9 is put in (for example, the control word "1") and the control word SW8 and the control word SW7 are both put out (for example, the control word "0"), even if the delay time of the cold control power-off delay relay TLKSD is set to "0 min", the delay time of the transformer cooler cold control power-off outlet tripping is also caused to be overlong, namely, under the condition that the oil temperature is high, 80min of 20min of the time relay KT11 plus 60min of the cold control power-off fixed delay device LKD60 is required, and the setting time is 60min after the transformer cooler is completely stopped; for another example, when the worker is put into operation, the control word SW9 is withdrawn, the control word SW7 and the control word SW8 are put into operation, and meanwhile, the delay time of the cold control power-off delay relay TLKSD is set to be 60min, so that the delay time of tripping the cold control power-off outlet of the transformer cooler is excessively long, under the condition that the oil temperature is high, the time of at least 20min of the time relay KT11 plus 60min of the cold control power-off delay relay TLKSD is 80min, and the time exceeds the setting time of the transformer cooler when the cold control power-off is completely stopped for 60 min; for another example, when the operator is in operation, the control word SW9 and the control word SW8 are exited, the control word SW7 is entered, and the cold-controlled power-off delay relay TLKSD is set to "60 min", at this time, the transformer cooler is too long in cold-controlled power-off and the cold-controlled power-off trip relay LKSDTZ does not exit the trip because the control word SW8 is not entered, which causes the and circuit (the symbol &shownin fig. 4) to be locked.
Therefore, a method for testing the cold control power-off time fixed value of the transformer cooler is urgently needed, the cold control power-off time fixed value of the transformer cooler is effectively monitored, and the setting time which is less than or equal to the full stop of the transformer cooler is ensured, so that the problem that three side circuit breakers of the transformer do not trip or trip in a delayed mode when the transformer runs at a high temperature for a long time is solved, and the running safety of a power grid is improved.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a method for testing the fixed value of the cold control power-off time of the transformer cooler, which can effectively monitor the fixed value of the cold control power-off time of the transformer cooler and ensure the fixed time less than or equal to the full stop of the transformer cooler, thereby avoiding the problem that a three-side circuit breaker of the transformer does not trip or trips in a delayed manner when the transformer runs at a high temperature for a long time and improving the running safety of a power grid.
In order to solve the above technical problem, an embodiment of the present invention provides a method for testing a cold control power-off time fixed value of a transformer cooler, which is used for a transformer that supplies power to three buses through a three-sided circuit breaker and a corresponding disconnecting switch, and the transformer has a cold control power-off power supply loop, a cold control power-off control loop and a cold control power-off time fixed value setting logic circuit, wherein the method tests a delay fixed value of a time relay on the cold control power-off control loop and a delay fixed value of a cold control power-off delay relay on the cold control power-off time fixed value setting logic circuit, and includes the following steps:
after the test environment is detected to be ready, triggering a first preset circuit connection condition to enable the cold control power-off power supply loop, the cold control power-off control loop and the cold control power-off time fixed value setting logic circuit to be connected, and acquiring a fixed delay fixed value of a cold control power-off fixed delay device on the cold control power-off time fixed value setting logic circuit to enable the whole time length at the moment of cold control power-off tripping to serve as a first test time length when the first preset circuit connection condition is triggered to pass through the delay fixed value of a time relay on the cold control power-off control loop to finally pass through the fixed delay fixed value of the cold control power-off fixed delay device on the cold control power-off time fixed value setting logic circuit;
taking the difference obtained by calculating the obtained first test duration and the fixed delay fixed value on the cold control power-off fixed delay device as the delay fixed value of the time relay on the cold control power-off control loop;
if the delay fixed value of the time relay on the cold control power-off control loop is judged not to be 0, the cold control power-off time of the transformer cooler is judged not to reach the standard, after the delay fixed value of the time relay on the cold control power-off control loop is required to be adjusted to be 0, a second preset circuit connection condition is continuously triggered, the cold control power-off power supply loop, the cold control power-off control loop and the cold control power-off time fixed value setting logic circuit are all connected again, the second preset circuit connection condition is obtained, the whole time length at the moment of cold control power-off tripping is finally realized through the delay fixed value of the time relay on the cold control power-off control loop to the delay fixed value of the cold control power-off time delay relay on the cold control power-off time setting logic circuit, and the whole time length at the moment of cold control power-off tripping is used as a second test time length;
if the obtained second test time length is judged to be less than or equal to the preset setting time of the full stop of the transformer cooler, the delay fixed value of the time relay on the cold control power-off control loop and the delay fixed value of the cold control power-off delay relay on the cold control power-off time fixed value setting logic circuit are judged to reach the standard; and otherwise, determining that only the delay fixed value of the cold control power-off delay relay on the cold control power-off time fixed value setting logic circuit does not reach the standard, and further adjusting the delay fixed value to be less than or equal to the preset setting time of the full stop of the transformer cooler.
Wherein the test environment ready specifically includes the following conditions:
the three-side circuit breaker and the disconnecting switches correspondingly connected with the three buses are all in a disconnected state;
the three side breakers are all in a closing state; and
and the cold control power-off power supply loop, the cold control power-off control loop and the cold control power-off time constant value setting logic circuit are all correctly wired, and all parts are normal.
The first preset circuit connection condition is specifically as follows:
the following actions can be completed at the same trigger time: all alternating current contactors on the cold control power-loss power supply loop lose magnetism, and a power supply conversion handle on the cold control power-loss power supply loop can be connected with a group of power supplies to work; a manual switch on the cold control power loss control loop is intelligently closed; and a temperature sensing contact on the cold control power-off time fixed value setting logic circuit is closed, a cold control power-off delay 60-minute trip control word is set to be 1, cold control power-off is set to be 0 through an oil temperature high locking control word, and a cold control power-off protection input control word is set to be 0, so that the cold control power-off time fixed value setting logic circuit realizes the trip of the cold control power-off trip relay only through the fixed delay fixed value of the cold control power-off fixed delay device.
The second preset circuit connection condition is specifically as follows:
the following actions can be completed at the same trigger time: all alternating current contactors on the cold control power-loss power supply loop lose magnetism, and a power supply conversion handle on the cold control power-loss power supply loop can be connected with a group of power supplies to work; a manual switch on the cold control power loss control loop is intelligently closed; and a temperature sensing contact on the cold control power-off time fixed value setting logic circuit is closed, a 60-minute cold control power-off delay tripping control word is set to be 0, cold control power-off is set to be 1 through an oil temperature high locking control word, and a cold control power-off protection input control word is set to be 1, so that the cold control power-off time fixed value setting logic circuit realizes the tripping of the cold control power-off tripping relay only through the delay fixed value of the cold control power-off delay relay.
And the fixed delay fixed value on the cold control power-off fixed delay device is the same as the preset setting time of the transformer cooler full stop.
And the preset setting time of the full stop of the transformer cooler is 60 min.
The embodiment of the invention has the following beneficial effects:
according to the invention, the delay fixed value of the time relay on the cold control power-off control loop and the delay fixed value of the cold control power-off delay relay on the cold control power-off fixed value setting logic circuit are monitored to realize effective monitoring of the cold control power-off fixed value of the transformer cooler and ensure the setting time less than or equal to the full stop of the transformer cooler, so that the problem that the three-side circuit breaker of the transformer does not trip or trips in a delay manner when the transformer runs at a high temperature for a long time is avoided, and the running safety of a power grid is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic diagram of a primary external connection of a transformer in the prior art;
FIG. 2 is a schematic diagram of a prior art cold-control power-loss power supply circuit of a transformer cooler;
FIG. 3 is a schematic diagram of a prior art transformer cooler cold control power loss control loop;
FIG. 4 is a schematic diagram of a logic circuit for setting a cold control power-off time setting value of a transformer cooler in the prior art;
fig. 5 is a flowchart of a method for testing a cold control power-off time fixed value of a transformer cooler according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 5, the method for testing the cold control power-off time fixed value of the transformer cooler provided in the embodiment of the present invention is applied to an existing transformer (as shown in fig. 1) that supplies power to three buses through a three-sided circuit breaker and a corresponding disconnecting switch, and the transformer has a cold control power-off power supply loop, a cold control power-off control loop, and a cold control power-off time fixed value setting logic circuit; wherein, the first and the second end of the pipe are connected with each other,
the cold control power-loss power circuit (as shown in fig. 2) comprises two sets of 380V alternating current power supplies (N is a common end), resistors F1 and F2 in the alternating current circuit, a power conversion handle SS, two alternating current contactors KMS1 and KMS 2; when the first group of power supply works, the power supply conversion handle SS is switched on from the first contact to the second contact and is switched off from the fifth contact to the sixth contact; when the second group of power supply works, the power supply conversion handle SS is firstly to secondly the contact is disconnected, and is secondly to thirdly the contact is connected; a normally closed contact KMJ1 of the alternating current contactor KMS1 is connected in series with an excitation coil of the alternating current contactor KMS2, and a normally closed contact KMJ2 of the alternating current contactor KMS2 is connected in series with an excitation coil of the alternating current contactor KMS 1;
the cold control power-off control loop (shown in fig. 3) comprises a manual switch ST (which is switched on from first to second during working), an alternating-current power supply fuse QF, a three-side breaker DL1 of the transformer, a DL2 and a DL3 (shown in fig. 1), normally-open contacts QF1, QF2 and QF3, an intermediate relay K for automatically controlling the cooler, a time relay KT11 and a cold control power-off full-stop outlet intermediate relay K11 of the transformer cooler; when the three-side circuit breakers 1DL, 2DL and 3DL are switched on, normally-open contacts QF1, QF2 and QF3 are closed and switched on; the delay setting value of the time relay KT11 is 0-20 min; a normally open contact KJ of the intermediate relay K for automatically controlling the cooler is connected in series with a normally closed contact KMJ1 of a power supply alternating current contactor KMS1, a normally closed contact KMJ2 of an alternating current contactor KMS2, a time relay KT11 and a transformer cooler cold control power loss full stop outlet intermediate relay K11; it should be noted that, in a test environment, the manual switch ST may also be intelligently turned on and off by connecting the intelligent device for a preset time;
the cold control power-off time fixed value setting logic circuit (shown in fig. 4) comprises an oil temperature sensing contact POP, a normally open contact KJ11 of a transformer cooler cold control power-off full stop intermediate relay K11, a cold control power-off fixed time delay device LKD60, a cold control power-off time delay relay TLKSD, a control word SW9 (a cold control power-off 60-minute trip control word is delayed), a control word SW8 (a cold control power-off control word is locked by oil temperature high locking), a control word SW7 (a cold control power-off protection input control word), a cold control power-off trip relay LKSTZ, a divider resistor R, an AND gate circuit and/or a gate circuit; wherein, the POP induction temperature of the oil temperature induction contact exceeds 75 ℃ and is closed; the cold control power-off fixed delay device LKD60 has a fixed delay fixed value (such as 60min, which is equal to the setting time of the transformer cooler full stop); the delay setting value of the cold control power loss delay relay TLKSD is 0-60 min; if the control words SW 7-SW 9 are '1', the input is performed, and if the control words SW 7-SW 9 are '0', the exit is performed; it should be noted that, in the test environment, the oil temperature sensing contact POP can be closed intelligently, and the control words SW 7-SW 9 can be preset in advance;
at the moment, the method for testing the cold control power-off time fixed value of the transformer cooler tests the delay fixed value of the time relay on the cold control power-off control loop and the delay fixed value of the cold control power-off delay relay on the cold control power-off time fixed value setting logic circuit, and comprises the following steps of:
step S1, after the testing environment is detected to be ready, triggering a first preset circuit connection condition to enable the cold control power-off power supply loop, the cold control power-off control loop and the cold control power-off time fixed value setting logic circuit to be connected, and acquiring the first preset circuit connection condition to trigger the whole time length at the moment of cold control power-off tripping to serve as a first testing time length from the time delay fixed value of a time relay on the cold control power-off control loop to the fixed time delay fixed value of a cold control power-off fixed time delay device on the cold control power-off time fixed value setting logic circuit;
firstly, avoiding live operation, and detecting whether a test environment is ready to meet the subsequent circuit connection requirement; the condition of the test environment readiness is specifically that the three-side circuit breakers DL1, DL2 and DL3 and the disconnecting switches 1G, 2G and 3G correspondingly connected with the three buses 1M, 2M and 3M are all in an off state; the three-side circuit breakers DL1, DL2 and DL3 are all in a closing state (namely corresponding normally open contacts QF1, QF2 and QF3 are all closed); and the cold control power-off power supply loop, the cold control power-off control loop and the cold control power-off time fixed value setting logic circuit all complete correct wiring, and all parts are normal.
Secondly, a first preset circuit connection condition is set to meet the circuit connection requirement when the delay timing value of a time relay KT11 on the cold control power loss control loop is detected; the first preset circuit connection condition is specifically that the following actions can be completed at the same trigger time: all alternating-current contactors on the cold-control power-loss power supply circuit are in power loss (namely normally closed contacts KMJ1 and KMJ2 of two alternating-current contactors KMS1 and KMS2 are kept in a closed state), and a power supply conversion handle SS on the cold-control power-loss power supply circuit can conduct one group of power supplies to work (such as a first group of power supplies or a second group of power supplies to work); a manual switch ST on the cold control power loss control loop is intelligently closed; and a temperature sensing contact POP on the cold control power-off time fixed value setting logic circuit is closed, a cold control power-off delay 60-minute trip control word SW9 is set to be 1, the cold control power-off is set to be 0 through an oil temperature high locking control word SW8, and a cold control power-off protection input control word SW7 is set to be 0, so that the cold control power-off time fixed value setting logic circuit realizes the cold control power-off trip of the trip relay LKSDTTZ only through the fixed delay fixed value (such as 60min) of the cold control power-off fixed delay device LKD 60. It should be noted that there may be other configurations that are sequentially arranged, and the power-on operation is completed at different times, for example, the power conversion handle SS can first turn on one set of power supplies (for example, the first set of power supplies or the second set of power supplies); a manual switch ST on the cold control power loss control loop is intelligently closed; a temperature sensing contact POP on the cold control power-off time fixed value setting logic circuit is closed, a cold control power-off delay 60-minute trip control word SW9 is set to be 1, cold control power-off is set to be 0 through an oil temperature high locking control word SW8, and a cold control power-off protection input control word SW7 is set to be 0; and finally triggering all alternating current contactors on the cold control power loss power supply loop to lose magnetism at the triggering moment.
Then, the cold control power-off power supply circuit, the cold control power-off control circuit and the cold control power-off time fixed value setting logic circuit are all in a connected state, and only the cold control power-off control circuit has a fixed delay fixed value (such as 60min) of a cold control power-off fixed delay device LKD60 for the delay fixed value of the time relay KT11 and the cold control power-off time fixed value setting logic circuit, so that the connection is realized after the respective delay time is finished. At this time, the cold control power-off time fixed value setting logic circuit finally realizes cold control power-off tripping (namely cold control power-off delay relay TKSDTZ tripping) by the cold control power-off fixed delay device LKD60, the triggering time when the first preset circuit connection condition is triggered and the instant time of cold control power-off delay relay TLKSD tripping need to be recorded, and the total time length calculated by the two is used as the first testing time length.
It can be understood that the triggering time when the above first preset circuit on condition is triggered should be counted at the time when the manual switch ST on the cold power loss control loop is intelligently closed, and the tripping moment of the cold power loss delay relay TLKSD is the ending time of the counting.
Step S2, calculating the difference between the obtained first test duration and a fixed delay fixed value on the cold control power-off fixed delay device to obtain a delay fixed value of a time relay on the cold control power-off control loop;
the specific process is that the fixed delay fixed value on the cold control power-off fixed delay device LKD60 is subtracted from the first test duration for 60min, and the delay fixed value of the time relay KT11 is obtained.
Step S3, if the delay fixed value of the time relay on the cold control power-off control loop is judged not to be 0, the cold control power-off time of the transformer cooler is judged not to reach the standard, a second preset circuit connection condition is continuously triggered after the delay fixed value of the time relay on the cold control power-off control loop is regulated to be 0, the cold control power-off power supply loop, the cold control power-off control loop and the cold control power-off time fixed value setting logic circuit are all connected, and the second preset circuit connection condition trigger is obtained to finally realize the whole time length at the moment of cold control power-off tripping as a second test time length from the delay fixed value of the time relay on the cold control power-off control loop to the delay fixed value of the cold control power-off time delay relay on the cold control power-off time fixed value setting logic circuit;
the specific process is that firstly, as the fixed delay fixed value 60min on the cold control power-off fixed delay device LKD60 is the same as the setting time of the transformer cooler full stop, as long as the delay fixed value of the time relay KT11 is not 0, the delay of the tripping of the cold control power-off outlet of the transformer cooler is overlong, the cold control power-off time of the transformer cooler is determined not to reach the standard, and the delay fixed value of the time relay KT11 on the cold control power-off control loop is required to be adjusted to be 0.
Secondly, after the delay fixed value of a time relay KT11 on the cold control power-off control loop is adjusted to be 0, a second preset circuit connection condition is set to meet the circuit connection requirement when the delay fixed value of the cold control power-off delay relay TLKSD on the cold control power-off time fixed setting logic circuit is detected; the second preset circuit connection condition is specifically that the following actions can be completed at the same trigger time: all alternating-current contactors on the cold-control power-loss power supply circuit are in power loss (namely normally closed contacts KMJ1 and KMJ2 of two alternating-current contactors KMS1 and KMS2 are kept in a closed state), and a power supply conversion handle SS on the cold-control power-loss power supply circuit can conduct one group of power supplies to work (such as a first group of power supplies or a second group of power supplies to work); a manual switch ST on the cold control power loss control loop is intelligently closed; and a temperature sensing contact POP on the cold control power-off time fixed value setting logic circuit is closed, a cold control power-off delay 60-minute trip control word SW9 is set to be 0, the cold control power-off is set to be 1 through an oil temperature high locking control word SW8, and a cold control power-off protection input control word SW7 is set to be 1, so that the cold control power-off time fixed value setting logic circuit realizes the LKSDTTZ trip of the cold control power-off trip relay only through the delay fixed value of the cold control power-off delay relay TLKSD. It should be noted that there may be other configurations that are sequentially arranged, and the power-on operation is completed at different times, for example, the power conversion handle SS can first turn on one set of power supplies (for example, the first set of power supplies or the second set of power supplies); a manual switch ST on the cold control power loss control loop is intelligently closed; a temperature sensing contact POP on the cold control power-off time fixed value setting logic circuit is closed, a cold control power-off delay 60-minute trip control word SW9 is set to be 0, cold control power-off is set to be 1 through an oil temperature high locking control word SW8, and a cold control power-off protection input control word SW7 is set to be 1; and finally triggering all alternating current contactors on the cold control power loss power supply loop to lose magnetism at the triggering moment.
Then, a cold control power-off power supply loop, a cold control power-off control loop (at the moment, the time delay fixed value of the cold control power-off control loop with a time relay KT11 is 0) and a cold control power-off time fixed value setting logic circuit are all in a connected state, and the connection is realized only after the cold control power-off time fixed value setting logic circuit has the time delay fixed value (such as 0-60 min) of a cold control power-off delay relay TLKSD. At this time, the cold control power-off time fixed value setting logic circuit finally realizes cold control power-off tripping (namely cold control power-off delay relay TKSDTZ tripping) by the cold control power-off delay relay TLKSD, the triggering time when the second preset circuit connection condition is triggered and the instant time of tripping of the cold control power-off delay relay TLKSD need to be recorded, and the total time length calculated by the two is used as the second testing time length.
It can be understood that the triggering time when the second preset circuit on condition is triggered should be counted at the time when the manual switch ST on the cold power loss control loop is intelligently closed, and the tripping moment of the cold power loss delay relay TLKSD is the ending time of the counting.
Step S4, if the obtained second test duration is judged to be less than or equal to the preset setting time of the transformer cooler full stop, the delay fixed value of the time relay on the cold control power-off control loop and the delay fixed value of the cold control power-off delay relay on the cold control power-off time fixed value setting logic circuit are both judged to reach the standard; and otherwise, determining that only the delay fixed value of the cold control power-off delay relay on the cold control power-off time fixed value setting logic circuit does not reach the standard, and further adjusting the delay fixed value to be less than or equal to the preset setting time of the full stop of the transformer cooler.
The specific process is that if the second test time (for example, 40min) <thepreset setting time of the transformer cooler full stop of 60min, the delay fixed value 0 of the time relay KT11 and the delay fixed value 40min of the cold control power-off delay relay TLKSD are both determined to reach the standard;
on the contrary, if the second test duration (for example, 80min) > is the preset setting time for the full stop of the transformer cooler of 60min, it is determined that only the delay timing value of the cold-control power-off delay relay TLKSD does not reach the standard 80min, and the further adjustment is required to be less than the preset setting time for the full stop of the transformer cooler of 60 min.
An application scenario of the method for testing the constant value of the cold control power-off time of the transformer cooler in the embodiment of the present invention is further described with reference to fig. 1 to 4:
step 1: before the constant value test of the cold control power-off time of the transformer cooler, disconnecting the three-side circuit breakers 1DL, 2DL and 3DL of the transformer, and disconnecting the three- side disconnecting switches 1G, 2G and 3G of the transformer to ensure the safety;
step 2: after ensuring that the three-side isolating switches 1G, 2G and 3G of the transformer are disconnected, switching on the three-side circuit breakers 1DL, 2DL and 3DL of the transformer, firstly checking the excitation of a power supply conversion handle SS and two alternating current contactors KMS1 and KMS2 in a cold loss control power supply loop, and the serial connection condition of a normally closed contact KMJ1 of an alternating current contactor KMS1 and an excitation coil of an alternating current contactor KMS2, and the serial connection condition of a normally closed contact KMJ2 of an alternating current contactor KMS2 and an excitation coil of an alternating current contactor KMS 1; secondly, checking the closing condition of normally open contacts QF1, QF2 and QF3 when three-side circuit breakers 1DL, 2DL and 3DL are switched on in a cold control power loss control loop, automatically controlling the excitation of an intermediate relay K relay for a cooler and the switching-on state of a normally open contact KJ1 of the intermediate relay K, exciting a time relay KT11, and connecting the normally open contact KJ of the intermediate relay K for automatically controlling the cooler with a normally closed contact KMJ1 of a power supply alternating current contactor KMS1, a normally closed contact KMJ2 of an alternating current contactor KMS2, a time relay KT11 and a transformer cooler cold control power loss full stop outlet intermediate relay K11 in series; finally, checking the closing condition of an oil temperature sensing contact POP in a cold control power-off time fixed value setting logic circuit, the excitation of a transformer cooler cold control power-off full stop outlet intermediate relay K11 and the opening and closing state of a normally open contact KJ11 thereof, the excitation of a cold control power-off fixed delay device LKD60 and a fixed delay fixed value thereof, the excitation of a cold control power-off delay relay TLKSD, the corresponding setting conditions of control words SW 7-SW 9 and the excitation of a cold control power-off trip relay LKSTZ;
and 3, step 3: after the steps 1 to 2 are completed, the testing environment is ready, a first preset circuit connection condition is started, at the moment, SW7 is set to be 0, SW8 is set to be 0, SW9 is set to be 1, the delay fixed value of a time relay KT11 is set to be 0min, and excitation tripping is carried out after a cold control power loss tripping relay LKSDTTZ (60min) is tested; furthermore, the delay fixed value of the time relay KT11 is set to be 20min, and excitation tripping is carried out after a cold control power loss tripping relay LKSDTZ (60min +20min is 80min) is tested. Certainly, at least one of SW 7-SW 8 is set to be 0, SW9 is set to be 1, the testing requirements can also be met, the delay fixed value of the time relay KT11 is set to be 0min or 20min, and the cold control power-off tripping relay delays the excitation tripping time;
and 4, step 4: after a testing environment is ready and the delay constant value of the relay KT11 is set to be 0min, starting a second preset circuit connection condition, setting SW7 to be '1', SW8 to be '1', and SW9 to be '0', setting the delay constant value of the cold control power-off delay relay TLKSD to be 60min, and testing a cold control power-off tripping relay LKSDTTZ (60min) and then performing excitation tripping; further, the delay fixed value of the cold control power-off delay relay TLKSD is set to be 20min, and excitation tripping is carried out after the cold control power-off tripping relay LKSDTTZ (20min) is tested. Of course, placing SW8 to "0" an AND gate & latch can be tested.
The embodiment of the invention has the following beneficial effects:
according to the invention, the delay fixed value of the time relay on the cold control power-off control loop and the delay fixed value of the cold control power-off delay relay on the cold control power-off fixed value setting logic circuit are monitored to realize effective monitoring of the cold control power-off fixed value of the transformer cooler and ensure the setting time less than or equal to the full stop of the transformer cooler, so that the problem that the three-side circuit breaker of the transformer does not trip or trips in a delay manner when the transformer runs at a high temperature for a long time is avoided, and the running safety of a power grid is improved.
It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (4)
1. A method for testing the fixed value of the cold control power-off time of a transformer cooler is used for a transformer which supplies power to three buses through a three-side circuit breaker and a corresponding isolating switch, the transformer is provided with a cold control power-off power supply loop, a cold control power-off control loop and a cold control power-off time fixed value setting logic circuit, and is characterized in that the method tests the delay fixed value of a time relay on the cold control power-off control loop and the delay fixed value of the cold control power-off delay relay on the cold control power-off time fixed value setting logic circuit, and comprises the following steps:
after the test environment is detected to be ready, triggering a first preset circuit connection condition to enable the cold control power-off power supply loop, the cold control power-off control loop and the cold control power-off time fixed value setting logic circuit to be connected, and acquiring a fixed delay fixed value of a cold control power-off fixed delay device on the cold control power-off time fixed value setting logic circuit to enable the whole time length at the moment of cold control power-off tripping to serve as a first test time length when the first preset circuit connection condition is triggered to pass through the delay fixed value of a time relay on the cold control power-off control loop to finally pass through the fixed delay fixed value of the cold control power-off fixed delay device on the cold control power-off time fixed value setting logic circuit;
taking the difference obtained by calculating the obtained first test duration and the fixed delay fixed value on the cold control power-off fixed delay device as the delay fixed value of the time relay on the cold control power-off control loop;
if the delay fixed value of the time relay on the cold control power-off control loop is judged not to be 0, the cold control power-off time of the transformer cooler is judged not to reach the standard, after the delay fixed value of the time relay on the cold control power-off control loop is required to be adjusted to be 0, a second preset circuit connection condition is continuously triggered, the cold control power-off power supply loop, the cold control power-off control loop and the cold control power-off time fixed value setting logic circuit are all connected again, the second preset circuit connection condition is obtained, the whole time length at the moment of cold control power-off tripping is finally realized through the delay fixed value of the time relay on the cold control power-off control loop to the delay fixed value of the cold control power-off time delay relay on the cold control power-off time setting logic circuit, and the whole time length at the moment of cold control power-off tripping is used as a second test time length;
if the obtained second test time length is judged to be less than or equal to the preset setting time of the full stop of the transformer cooler, the delay fixed value of the time relay on the cold control power-off control loop and the delay fixed value of the cold control power-off delay relay on the cold control power-off time fixed value setting logic circuit are judged to reach the standard; otherwise, determining that only the delay fixed value of the cold control power-off delay relay on the cold control power-off time fixed value setting logic circuit does not reach the standard, and further adjusting the delay fixed value of the cold control power-off delay relay on the cold control power-off time fixed value setting logic circuit to be less than or equal to the preset setting time of the full stop of the transformer cooler;
the first preset circuit connection condition is specifically as follows: the following actions can be completed at the same trigger time: all alternating current contactors on the cold control power-loss power supply loop lose magnetism, and a power supply conversion handle on the cold control power-loss power supply loop can be connected with a group of power supplies to work; a manual switch on the cold control power loss control loop is intelligently closed; the temperature sensing contact on the cold control power-off time fixed value setting logic circuit is closed, the cold control power-off delay 60-minute trip control word is set to be 1, the cold control power-off is set to be 0 through the oil temperature high locking control word, and the cold control power-off protection input control word is set to be 0, so that the cold control power-off time fixed value setting logic circuit realizes the trip of the cold control power-off trip relay only through the fixed delay fixed value of the cold control power-off fixed delay device;
the second preset circuit connection condition is specifically as follows: the following actions can be completed at the same trigger time: all alternating current contactors on the cold control power-loss power supply loop lose magnetism, and a power supply conversion handle on the cold control power-loss power supply loop can be connected with a group of power supplies to work; a manual switch on the cold control power loss control loop is intelligently closed; and a temperature sensing contact on the cold control power-off time fixed value setting logic circuit is closed, a 60-minute cold control power-off delay tripping control word is set to be 0, cold control power-off is set to be 1 through an oil temperature high locking control word, and a cold control power-off protection input control word is set to be 1, so that the cold control power-off time fixed value setting logic circuit realizes the tripping of the cold control power-off tripping relay only through the delay fixed value of the cold control power-off delay relay.
2. The method for testing the constant value of the cold control power-off time of the transformer cooler according to claim 1, wherein the ready test environment specifically comprises the following conditions:
the three-side circuit breaker and the disconnecting switches correspondingly connected with the three buses are all in a disconnected state;
the three side breakers are all in a closing state; and
and the cold control power-off power supply loop, the cold control power-off control loop and the cold control power-off time fixed value setting logic circuit all complete correct wiring, and all the parts are normal.
3. The method for testing the constant value of the cold control power-off time of the transformer cooler according to claim 1, wherein the constant value of the fixed delay time on the cold control power-off delay device is the same as the preset setting time of the transformer cooler in full stop.
4. The method for testing the constant value of the cold control power-off time of the transformer cooler as claimed in claim 3, wherein the preset setting time of the full stop of the transformer cooler is 60 min.
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| CN115032491B (en) * | 2022-08-12 | 2022-11-01 | 国网山东省电力公司电力科学研究院 | Non-electric quantity protection test method for transformer |
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