CN110542826A - On-site calibration method for failure protection starting circuit of power grid transmission line breaker - Google Patents

Abstract

The invention provides a field calibration method for a failure protection starting circuit of a power grid transmission line breaker, which comprises the steps of connecting a common parallel point between a short-circuit failure protection device and a primary I, II bus knife switch; after the short circuit is completed, all the protection function hard pressing plates and the contacts are initially disconnected, a first relay protection device or a second relay protection device is selected as a relay protection device to be operated, and a protection action is determined; selecting an overcurrent protection contact of the overcurrent protection device, correspondingly connecting a protection function hard pressing plate and a switch relay on the to-be-operated relay protection device with the overcurrent protection contact, and after starting protection action through closing control, utilizing a failure protection device to load a test signal to obtain a test result as success of starting failure, and verifying that all line connections among the failure protection device, the overcurrent protection device and the to-be-operated relay protection device are correct. By implementing the invention, the problems of wiring error or missing wiring of the breaker failure protection starting circuit or damage of a hard pressing plate with a protection function and the like are verified on site.

Description

A method for on-site verification of the start-up circuit for power grid transmission line circuit breaker failure protection

technical field

The invention relates to the technical field of relay protection, in particular to an on-site verification method for a circuit breaker failure protection start-up circuit of a power grid transmission line.

Background technique

In order to increase the power transmission capacity of power grid transmission lines, phase-separated circuit breakers are often used, and the corridors of transmission lines are generally more than ten or even hundreds of kilometers long, and the probability of failure is very high. Therefore, the power grid transmission lines trip the circuit breakers through protection actions. However, during this process, failure to operate may occur due to the secondary circuit or the circuit breaker itself. Therefore, in order to prevent accidents from expanding and improve system stability, power grid transmission lines need to be installed with circuit breaker failure protection.

Circuit breaker failure protection means that when the relay protection action of the faulty electrical equipment issues a trip command and the circuit breaker refuses to operate, the circuit breaker failure can be judged by using the protection action information of the faulty equipment and the current information of the circuit breaker that refuses to operate. Cut off other related circuit breakers in the same plant within a short time limit to minimize the scope of power outages, thereby ensuring the stable operation of the entire power grid and avoiding severe burning of faulty components such as generators and transformers and collapse of the power grid. Therefore, circuit breaker failure protection, as an important near-backup protection for power grid and main equipment, is a very important protection in relay protection, which directly affects the stable operation of power system.

In view of the fact that circuit breaker refusal is a double fault in the case of power grid fault and superimposed circuit breaker operation failure, its protection requirements are allowed to be appropriately reduced, but the fault should be isolated in the smallest range, so the smaller the fault range of the circuit breaker failure protection action, the better. Considering that there may be multiple transmission lines, main transformers, and bus tie bays in a substation, only by accurately identifying a specific bay where a circuit breaker fails can the protection of the circuit breaker fail to isolate the fault in the smallest range, which requires a breaker failure The protection is set according to the interval and the failure start circuit is set. The circuit breaker failure protection starting circuit is an important part of the circuit breaker failure protection, and is one of the keys to ensure the correct operation of the whole set of protection. It must be safe and reliable, and double discrimination should be realized to prevent the circuit breaker failure from being judged by a single condition and the protection contacts are jammed. False start caused by non-return or false touch, false power on, etc.

As shown in Figure 1, it is a schematic diagram of logical structure connection when the circuit breaker failure protection starting circuit is normal in the prior art. The circuit breaker failure protection starting circuit includes a failure protection device M1, an overcurrent protection device M2, and a first dual protection device. A relay protection device M3 and a second relay protection device M4, an operation box operation circuit M5 connected to other protections (such as bus protection, stability control device protection, etc.), and a primary I bus knife switch 1YQJ and a primary II bus knife switch 2YQJ ; Wherein, the failure protection device M1 passes through the three-phase over-current protection contacts LJA1, LJB1 and LJC1 of the over-current protection device M2 correspondingly connected to each phase protection contact of the first relay protection device M3, and then passes through the I-bus knife switch 1YQJ once Or once the II busbar knife switch 2YQJ is closed to form a loop, and the three-phase overcurrent protection contacts LJA1, LJB1 and LJC1 of the overcurrent protection device M2 are connected to each phase protection contact of the second relay protection device M4, and then passed through once The I bus knife switch 1YQJ or the primary II bus knife switch 2YQJ is closed to form a circuit, and the three-phase overcurrent protection contacts LJA2, LJB2 and LJC2 connected in series on the overcurrent protection device M2 are simultaneously connected to the operation box operation circuit M5 and then passed The primary I bus knife switch 1YQJ or the primary II bus knife switch 2YQJ is closed to form a loop.

It should be noted that each phase of the first protective relay device M3 and the second protective relay device M4 has a protective function hard press plate for controlling switching on and off and its corresponding switch relay, such as the first protective relay device M3 The switching relay TJA1 corresponding to the hard pressing plate 1LP9 of phase A protection, the switching relay TJB1 corresponding to the hard pressing plate 1LP10 of phase B protection, and the switching relay TJC1 corresponding to the hard pressing plate 1LP11 of phase C protection, as in the second relay protection device M4 The switch relay TJA2 corresponding to the A-phase protection function hard pressure plate 2LP9, the switch relay TJB2 corresponding to the B-phase protection function hard pressure plate 2LP10, and the switch relay TJC2 corresponding to the C-phase protection function hard pressure plate 2LP11.

The operation box operation circuit M5 includes the protection function hard pressure plate LP for controlling switching on and off and its corresponding two relays TJQ and TJR connected in parallel. Protection action contact 1 refers to the normally open contact provided by other protections in the substation (such as busbar protection), once its corresponding protection action (such as busbar protection action or test short circuit) is closed, and drives the relay TJQ action to close; other Protection action contact 2 refers to the normally open contact provided by other protections in the substation (such as the action of the stability control device), once the corresponding protection action (such as the action of the stability control device or test short circuit) is closed, and the relay TJR is driven to act closure. The primary I bus knife switch 1YQJ or the primary II bus knife switch 2YQJ are respectively connected to multiple lines. When gate 1YQJ is closed, line 1 and line 2 are connected.

Since the circuit breaker failure protection starting circuit may have problems such as wiring errors or missing wiring or damage to the hard pressure plate of the protection function (as shown in Figure 4), before the above circuit breaker failure protection starting circuit is put into operation, its function must be in accordance with The design drawings are verified step by step, and the above problems are found through the verification, and the problems can be eliminated before they can be put into operation. However, there is still a lack of a step-by-step verification method for the start-up circuit of the circuit breaker failure protection of the power grid transmission line, especially the on-site verification of the start-up circuit of the circuit breaker failure protection of the power grid transmission line, which provides guarantee for the safe operation of the power grid transmission line.

Contents of the invention

The technical problem to be solved by the embodiments of the present invention is to provide a method for on-site verification of the circuit breaker failure protection start-up circuit of the power grid transmission line, which can detect problems such as wiring errors or missing connections or damage to the protective function of the hard pressure plate on site, thereby Discover hidden dangers in time and provide guarantee for the safe operation of power grid transmission lines.

In order to solve the above technical problems, the embodiment of the present invention provides a method for on-site verification of the circuit breaker failure protection start-up circuit of the power grid transmission line, which is used to include a failure protection device, an overcurrent protection device, a first relay protection device, a second relay protection device The electric protection device, the operation circuit of the operation box, the circuit breaker failure protection starting circuit of the primary I bus knife switch and the primary II bus knife switch, the method includes the following steps:

When it is determined that both the primary I bus knife switch and the primary II bus knife switch are in the disconnected state, connect the common parallel point between the primary I bus knife switch and the primary II bus knife switch through one end, and the other One end is connected to the wire of the failure protection device to realize short circuit;

After the short-circuiting is completed, set the first protective relay device, the second protective relay device, and all protective function hard pressing plates on the operating circuit of the operation box to the exit state and turn the overcurrent protection All overcurrent protection contacts on the device are initially disconnected, and the first relay protection device or the second relay protection device is selected as the relay protection device to be operated, and the relay protection device to be operated is further determined The current protection action to be implemented on the protection device; wherein, the protection action to be implemented includes A-phase single-phase protection action, B-phase single-phase protection action, C-phase single-phase protection action, and any combination of any two of ABC three-phase The formed two-phase protection action and ABC three-phase protection action;

According to the current protection action to be implemented on the relay protection device to be operated, determine the selected over-current protection contact on the over-current protection device and the selected over-current protection contact correspondingly connected to the relay protection device to be operated The protective function of the hard press plate and the switch relay, and by controlling the closure of the selected over-current protection contact of the over-current protection device and connecting the protection function hard press plate on the relay protection device to be operated to enter the input state and the switch relay is closed. After starting the protection action currently to be implemented on the relay protection device to be operated, load a test signal to the failure protection device, and further if it is determined that the failure protection device has been loaded with the test signal, the test result generated is start If the failure is successful, it is verified that the failure protection device on the circuit breaker failure protection startup circuit and the overcurrent protection device and its selected overcurrent protection contacts are correspondingly connected to the protection function on the relay protection device to be operated All wiring connections between hard plate and switching relay are correct.

Wherein, the method further includes:

If it is determined that the failure protection device has been loaded with the test signal and the test result generated by the test signal is failure to start, then verify the failure protection device and the overcurrent protection device on the circuit breaker failure protection start circuit and their The selected overcurrent protection contact corresponds to at least one error in all line connections between the protective function hard pressure plate and the switch relay on the relay protection device to be operated, and further adjusts the circuit breaker failure protection start circuit. The failure protection device is connected to the overcurrent protection device and its selected overcurrent protection contacts correspondingly, until the faulty line connection between the protection function hard press plate on the relay protection device to be operated and the switching relay is correct.

Wherein, the method further includes:

Disconnect the connection lines between the first relay protection device and the second relay protection device and the failure protection device respectively, and control the closure of all over-current protection contacts on the over-current protection device and the After the protection function hard pressing plate on the operating circuit of the operation box enters the input state and at least one relay is closed, load the test signal to the failure protection device, and further if it is determined that the failure protection device has been loaded with the test signal generated by the test signal As a result, the start-up failure is successful, and it is verified that all connections between the failure protection device, the overcurrent protection device and the operation circuit of the operation box on the circuit breaker failure protection start-up circuit are correct.

Wherein, the method further includes:

If it is determined that the failure protection device has been loaded with the test signal and the test result generated is failure to start, then it is verified that the failure protection device, the overcurrent protection device and the There is at least one error in the line connection between the operation circuit of the operation box, and there is an error between the failure protection device on the circuit breaker failure protection starting circuit, the overcurrent protection device and the operation circuit of the operation box. The line connection is correct.

Wherein, the method further includes:

Disconnect one end of the wire connecting the common parallel contact between the primary I bus switch and the primary II bus switch and the other end connected to the failure protection device, and control the closing of the primary I bus switch and the If the primary II bus switch is disconnected, if it can be determined that the failure protection device has been loaded with the test signal generated by the test result and continues to be a successful start-up failure, then determine the distance between the primary I bus switch and the failure protection device. All line connections between are correct; On the contrary, if it is determined that the failure protection device has been loaded with the test result generated by the test signal, the failure to start is successfully changed to failure to start, then it is determined that the primary I bus knife switch and the There is at least one error in the line connection between the failure protection devices, and the wrong line connection between the failure protection device and the primary I-bus knife switch is further adjusted to be correct.

Wherein, the method further includes:

Controlling the disconnection of the primary I bus knife switch and the closing of the primary II bus knife switch, if it can be determined that the failure protection device has been loaded with the test signal and the test result generated by the test signal continues to maintain the startup failure success, then determine the All line connections between the primary II bus knife switch and the failure protection device are correct; on the contrary, if it is determined that the failure protection device has been loaded with the test signal and the test result generated by the test signal is changed from a successful startup failure to a startup failure failure, Then determine that there is at least one error in the line connection between the primary II bus knife switch and the failure protection device, and further adjust the wrong line connection between the failure protection device and the primary II bus knife switch to be correct until.

Wherein, the respective corresponding switch relays on the first relay protection device and the second relay protection device are closed by loading a corresponding voltage setting on each switch relay and its corresponding circuit connected to the protection function hard press board. value and current setting value to achieve.

Wherein, the closing of each overcurrent protection contact on the overcurrent protection device is realized by being loaded with a corresponding overcurrent.

Wherein, the closing of the two relays on the operation circuit of the operation box is realized through the action of the protection contact connected to the front end of the operation box.

Implementing the embodiment of the present invention has the following beneficial effects:

In the present invention, firstly, the connection between the failure protection device and the primary I bus knife switch and the primary II bus knife switch is short-circuited, and the protection action to be realized on the first relay protection device or the second relay protection device is used to control After the overcurrent protection device loads the corresponding overcurrent to close the corresponding overcurrent protection contact and loads the voltage setting value and current setting value on the first relay protection device or the second relay protection device to close the corresponding switch relay, the failure occurs The protection device is loaded with the test results generated by the test signal to complete the line verification between the first relay protection device or the second relay protection device and the overcurrent protection device; secondly, disconnect the first relay protection device, the second relay protection device The connection between the electrical protection device and the failure protection device, control the overcurrent protection device to load the corresponding overcurrent to close the corresponding overcurrent protection contact, and control the action of the protection contact connected to the operation circuit end of the operation box to close the corresponding relay , complete the line verification between the operation box operation circuit and the overcurrent protection device by loading the test results generated by the test signal through the failure protection device; finally, disconnect the failure protection device and the primary I bus knife switch closure and the primary II bus knife switch The short-circuit connection between them controls the closure of the primary I bus knife switch or the primary II bus knife switch, and whether the test result generated by loading the test signal with the failure protection device continues to maintain the failure to start successfully to complete the failure protection device and the primary I bus. The connection verification between the knife switch and the primary II bus knife switch can be verified on site to find out problems such as wiring errors or missing wiring or damage to the protective function of the hard pressure plate, so as to detect hidden dangers in time and provide a guarantee for the safe operation of power grid transmission lines. Assure.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For a person of ordinary skill in the art, obtaining other drawings based on these drawings still belongs to the scope of the present invention without any creative effort.

Fig. 1 is a schematic diagram of logical structure connection when the circuit breaker failure protection startup circuit is normal in the prior art;

Fig. 2 is a schematic diagram of the logical structure connection of the operating circuit of the operation box in Fig. 1;

Fig. 3 is a schematic diagram of the logical structure connection of the corresponding line when the primary I bus knife switch is closed and the primary II bus knife switch is disconnected in Fig. 1;

Fig. 4 is a schematic diagram of logical structure connection when the circuit breaker failure protection starting circuit in Fig. 1 is wrong;

Fig. 5 is a flow chart of an on-site verification method for a power grid transmission line circuit breaker failure protection start-up circuit provided by an embodiment of the present invention;

Fig. 6 is a schematic diagram of logical structure connection when a relay with a voltage setting value and a current setting value is loaded in a single relay protection device;

FIG. 7 is a schematic diagram of a logic structure connection of an overcurrent protection device loaded with an overcurrent.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in Figure 5, in the embodiment of the present invention, a method for on-site verification of the start-up circuit for the failure protection of the power grid transmission line circuit breaker is provided, which is used to include the failure protection device M1, the overcurrent protection device M2, the first relay protection Device M3, second relay protection device M4, operation box operation circuit M5, primary I bus knife switch 1YQJ and primary II bus knife switch 2YQJ circuit breaker failure protection starting circuit (as shown in Figure 1), the circuit breaker fails The specific structure of the protection starting circuit is existing, please refer to the prior art.

In the embodiment of the present invention, the on-site verification method for the circuit breaker failure protection start-up circuit of the grid transmission line includes the following steps:

Step S1, when it is determined that both the primary I bus switch and the primary II bus switch are in the disconnected state, connect the common parallel connection between the primary I bus switch and the primary II bus switch through one end. contact, and the other end is connected to the wire of the failure protection device to realize short circuit;

The specific process is to consider whether the line connection between the primary I bus 1YQJ and the primary II bus 2YQJ and the failure protection device M5 is correct or not based on the failure protection device M1, the overcurrent protection device M2, and the first relay protection device M3 , the second relay protection device M4, and the line connection between one of the operation box operation circuit M5 is correct, the verification can be carried out. Therefore, the primary I bus 1YQJ and the primary II bus 2YQJ are respectively connected with the failure protection device M5 The lines in between are short-circuited.

Step S2: After the short-circuit is completed, initially set all the protective function hard pressing plates on the first protective relay device, the second protective relay device, and the operating circuit of the operation box to the exit state and reset the All overcurrent protection contacts on the overcurrent protection device are initially disconnected, and the first relay protection device or the second relay protection device is selected as the relay protection device to be operated, and the standby relay protection device is further determined. Operate the current protection action to be implemented on the relay protection device; wherein, the protection action to be implemented includes A-phase single-phase protection action, B-phase single-phase protection action, C-phase single-phase protection action, any Two combined two-phase protection action and ABC three-phase protection action;

The specific process is that during calibration, all protective function hard presses are initially in the exit state and all overcurrent protection contacts are initially disconnected, which can reduce operational errors. At this time, the first protective relay device M3 or the second protective relay device M4 can be selected as the operation target, that is, the first protective relay device M3 or the second protective relay device M4 can be selected as the protective relay device to be operated, and at the same time Also select the protection action to be realized by the relay protection device to be operated, such as A-phase single-phase protection action, B-phase single-phase protection action, C-phase single-phase protection action, AB phase protection action, BC phase protection action, AC phase Protection action and ABC three-phase protection action.

It can be understood that whether the protection action currently to be implemented on the relay protection device to be operated can be realized can be reflected by the protection status reflected by the relay protection device to be operated, for example, the screen directly displays relevant information about the start of the protection action, Or the indicator light lights up the corresponding phase line to prompt the protection action to start, etc. Once the reflected protection status is different, it means that there is a wiring error or missing wiring on the relay protection device to be operated, or the hard pressure plate of the protection function is damaged, etc. question.

It should be noted that even if it is normally reflected by the protection state reflected by the relay protection device to be operated, other states such as multi-connection or short-circuit may also occur, so it is necessary to further verify through the test results of the failure protection device M1 .

Step S3, according to the current protection action to be implemented on the relay protection device to be operated, determine the selected over-current protection contact on the over-current protection device and the selected over-current protection contact correspondingly connected to the relay to be operated The protection function hard press plate and the switch relay on the protection device, and by controlling the closure of the selected over-current protection contact of the over-current protection device and connecting the protection function hard press plate on the relay protection device to be operated, enter the input state and switch After the relay is closed to start the protection action currently to be implemented on the relay protection device to be operated, load the test signal to the failure protection device, and further if it is determined that the failure protection device has been loaded with the test signal generated by the test signal As a result, the startup failure is successful, and it is verified that the failure protection device on the circuit breaker failure protection starting circuit is connected to the relay protection device to be operated correspondingly to the overcurrent protection device and its selected overcurrent protection contact All wiring connections between the protective function hard plate and the switching relay are correct.

The specific process is as follows: first, according to the current protection action to be realized on the relay protection device to be operated, determine the overcurrent protection contact selected on the overcurrent protection device M2 and the corresponding connection of the selected overcurrent protection contact to the relay protection device to be operated The protection function of the hard press plate and the switch relay, through the control of the over-current protection contact selected by the over-current protection device M2 to close and connect the protection function hard press plate on the relay protection device to be operated, enter the input state and the switch relay is closed to start the relay to be operated. The current protection action to be implemented on the electrical protection device. It should be noted that the closure of each overcurrent protection contact on the overcurrent protection device M2 is realized by loading a corresponding overcurrent (as shown in Figure 7), while the first relay protection device M3 and the second relay protection The closing of the corresponding switch relays on the protection device M4 is realized by loading the corresponding voltage setting value and current setting value on each switch relay and its corresponding circuit connected to the protective function of the hard pressure plate (as shown in Figure 6). At this time, the overcurrent of each phase loaded, the voltage setting value and the current setting value are all set according to the actual design requirements, and will not be described here.

In one embodiment, the relay protection device to be operated is the first relay protection device M3, and the current protection action to be implemented is A-phase single-phase protection action, then the over-current protection contact LJA1 of the over-current protection device M2 is selected, Corresponding to the protective function hard press plate 1LP9 and the switching relay TJA1 on the first relay protection device M3, and closing the overcurrent protection contact LJA1 of the overcurrent protection device M2, corresponding to the protection function hard press plate 1LP9 on the first relay protection device M3 Enter the input state and the switch relay TJA1 is closed;

In another embodiment, the relay protection device to be operated is the first relay protection device M3, and the current protection action to be implemented is the AB two-phase protection action, then the overcurrent protection contacts LJA1 and LJB1, corresponding to the protective function hard pressure plates 1LP9, 1LP10 and switch relays TJA1, TJB1 on the first relay protection device M3, closes the overcurrent protection contacts LJA1 and LJB1 of the overcurrent protection device M2, corresponding to the first relay protection device The protection function hard pressure plates 1LP9 and 1LP10 on M3 are all put into the input state and the switch relays TJA1 and TJB1 are closed;

In yet another embodiment, the relay protection device to be operated is the second relay protection device M4, and the current protection action to be implemented is BC two-phase protection action, then the overcurrent protection contacts LJB1 and LJB1 of the overcurrent protection device M2 are selected. LJC1, corresponding to the protection function hard pressure plates 2LP10, 2LP11 on the second relay protection device M4 and switch relays TJB2, TJC2, closes the over-current protection contacts LJB1 and LJC1 of the over-current protection device M2, corresponding to the second relay protection device The protective function hard pressure plates 2LP10 and 2LP11 on the M4 are all put into the input state and the switch relays TJB2 and TJC2 are closed;

In yet another embodiment, the relay protection device to be operated is the second relay protection device M4, and the current protection action to be implemented is the ABC three-phase protection action, then the overcurrent protection contacts LJA1, LJA1, LJB1 and LJC1, corresponding to the protection function hard pressure plates 2LP9, 2LP10, 2LP11 on the second relay protection device M4 and the switching relays TJA2, TJB2, TJC2, close the overcurrent protection contacts LJA1, LJB1 and LJC1 of the overcurrent protection device M2 , corresponding to the protective function on the second relay protection device M4, the hard pressure plates 2LP9, 2LP10, and 2LP11 all enter the input state and the switching relays TJA2, TJB2, and TJC2 are all closed.

Secondly, load the test signal to the failure protection device M1 (design according to the actual requirements), if it is determined that the failure protection device M1 has been loaded with the test signal and the test result generated is that the startup failure is successful, then it is verified that the circuit breaker failure protection is on the startup circuit. The failure protection device M1 is connected to the overcurrent protection device M2 and its selected overcurrent protection contacts. The protective function on the relay protection device to be operated is connected correctly. All the circuit connections between the hard pressure plate and the switching relay are correct, so that it can be verified. The wiring error or missing wiring between the overcurrent protection device M2 and the first relay protection device M3 or the second relay protection device M4.

It should be noted that in order to verify on-site problems such as wiring errors or missing wiring on the circuit breaker failure protection starting circuit or damage to the protective function of the hard pressure plate, you can repeat steps S1 to S3, and sequentially check the first relay All protection actions of the protection device M3 and all protection actions of the second relay protection device M4 are verified, so that the overcurrent protection device M2 and the first relay protection device M3 and the second relay protection device M4 can be verified All wiring errors or missing wiring between them.

Of course, the wiring error or missing wiring between the overcurrent protection device M2 and the first relay protection device M3 or the second relay protection device M4 needs to be further adjusted to be correct to ensure the line connection of the circuit breaker failure protection startup circuit normal, so the method further includes:

If it is determined that the failure protection device M1 has been loaded with a test signal and the test result generated is failure to start, then it is verified that the failure protection device M1 on the circuit breaker failure protection startup circuit corresponds to the overcurrent protection device M2 and its selected overcurrent protection contacts There is at least one error in all line connections between the protective function hard pressure plate on the relay protection device to be operated and the switch relay, and further adjustment of the failure protection device M1 and overcurrent protection device M2 on the circuit breaker failure protection startup circuit Select the overcurrent protection contact corresponding to the connection between the protection function hard pressure plate on the relay protection device to be operated and the wrong line connection between the switch relay until it is correct.

In the embodiment of the present invention, it is also necessary to check the wiring error or missing wiring between the overcurrent protection device M2 and the operating circuit M5 of the operation box. At this time, the specific checking method is as follows:

Disconnect the connection lines between the first relay protection device M3 and the second relay protection device M4 and the failure protection device M1 respectively, and control the closure of all over-current protection contacts on the over-current protection device M2 and the operation box operation circuit M5 After the protective function hard pressure plate on the upper side enters the input state and at least one relay is closed, load the test signal to the failure protection device M1, and further if it is determined that the failure protection device M1 has been loaded with the test signal and the test result generated is that the startup failure is successful, then verify All connections between the failure protection device M1, the overcurrent protection device M2 and the operation box operation circuit M5 on the circuit breaker failure protection startup circuit are correct. It should be noted that the closing of the two relays on the operation circuit M5 of the operation box is realized through the action of the protective contact connected to the front end of the operation box.

In one embodiment, the connection lines between the first relay protection device M3 and the second relay protection device M4 and the failure protection device M1 are disconnected to ensure that the test signal is the only path through the operation circuit M5 of the operation box, and the control The relay TJQ is closed, if the failure protection device M1 has been loaded with a test signal and the test result generated is that the start failure is successful, it means that the circuit is normal, that is, the connection between the failure protection device M1, the overcurrent protection device M2 and the operation circuit M5 of the operation box All wiring connections are correct.

Of course, the wiring error or missing wiring between the overcurrent protection device M2 and the operation box operation circuit M5 needs to be further adjusted to be correct to ensure that the line connection of the circuit breaker failure protection starting circuit is normal, so the method further includes:

If it is determined that the failure protection device M1 has been loaded with a test signal and the test result generated is a failure to start, then verify the circuit breaker failure protection start circuit between the failure protection device M1, the overcurrent protection device M2 and the operation box operation circuit M5. There is at least one error in the line connection, and the wrong line connection between the failure protection device M1, the overcurrent protection device M2 and the operation box operation circuit M5 on the circuit breaker failure protection startup circuit is further adjusted until it is correct.

In the embodiment of the present invention, the verification of wiring errors or missing wiring between the failure protection device M1 and the primary I bus knife switch 1YQJ and the primary II bus knife switch 2YQJ needs to be based on the procedures in steps S1 to S3 above. The circuit connection between the flow protection device M2 and the first relay protection device M3 or the second relay protection device M4 is correct, and the corresponding protective function hard pressing board on the first relay protection device M3 or the second relay protection device M4 Entering into the input state and the switch relay is closed, and the corresponding over-current protection contact of the over-current protection device M2 is closed. The protection function of M5 can only be realized under the premise that the hard pressure plate enters the input state, the relay TJQ or TJR is closed, and the overcurrent protection contacts LJA2, LJB2, and LJC2 of the overcurrent protection device M2 are all closed. At this time, the specific verification method is as follows:

(1) Check the line connection between the failure protection device M1 and the primary I bus knife switch 1YQJ:

Disconnect the common parallel contact between the primary I bus knife switch 1YQJ and the primary II bus knife switch 2YQJ at one end and the wire connected to the failure protection device M1 at the other end, and control the closing of the primary I bus knife switch 1YQJ and the primary II bus knife switch 2YQJ If it can be determined that the failure protection device M1 has been loaded with a test signal and the test result generated continues to be a successful startup failure, it is determined that all the line connections between the primary I bus knife switch 1YQJ and the failure protection device M1 are correct; otherwise, If it is determined that the failure protection device M1 has been loaded with a test signal and the test result generated by the test signal has changed from a successful start failure to a failure to start failure, then it is determined that there is at least one error in the line connection between the I bus knife switch 1YQJ and the failure protection device M1, and further Adjust the wrong line connection between the failure protection device M1 and the primary I bus knife switch 1YQJ until it is correct.

(2) Check the line connection between the failure protection device M1 and the primary II bus knife switch 2YQJ:

Disconnect the common parallel contact between the primary I bus knife switch 1YQJ and the primary II bus knife switch 2YQJ at one end and the wire connected to the failure protection device M1 at the other end, and control the disconnection of the primary I bus knife switch 1YQJ and the primary II bus knife switch 2YQJ is closed, if it can be determined that the failure protection device M1 has been loaded with a test signal and the test result generated continues to be a successful startup failure, then it is determined that all the line connections between the primary II bus knife switch 2YQJ and the failure protection device M1 are correct; otherwise, If it is determined that the failure protection device M1 has been loaded with a test signal and the test result generated by the test signal has changed from a successful start failure to a failure to start failure, then it is determined that there is at least one error in the line connection between the II bus knife switch 2YQJ and the failure protection device M1, and further Adjust the wrong line connection between the failure protection device M1 and the primary II bus knife switch 2YQJ until it is correct.

Based on Fig. 1, the application scenario of the on-site verification method for the circuit breaker failure protection start-up circuit of the power grid transmission line in the embodiment of the present invention is further explained:

Step 1. Put the hard pressure plates of the protection functions of all devices in the exit state, the overcurrent protection contacts are all off, and all the switch relays and relays are off;

Step 2. Take the A phase of the first relay protection device M3 as an example, simulate the A phase test, and add an analog test to the A, B, C three-phase current and voltage analog input terminals of the verification line, so that the first The contact action of the switch relay TJA1 in the relay protection device M3 is closed, and at the same time, the analog quantity test is added to the three-phase over-current protection terminals A, B, and C, so that the corresponding over-current protection contact LJA1 in the over-current protection device M2 is closed;

Step 3, only the protective function hard pressing plate 1LP9 in the first relay protection device M3, and the rest of the protective function hard pressing plates are all maintained in the exit state;

Step 4: Closing of the primary I bus knife switch 1YQJ of analog line 1, so that the primary I bus knife switch 1YQJ is closed;

Step 5. Observe whether the failure protection device M1 has a corresponding "start failure" light on. If the light is on, it means that the start failure of the corresponding phase A is successful. The reason is that after the circuit is connected correctly, the positive potential of the failure protection device M1 passes through 01 The circuit goes to the overcurrent protection contact LJA1, then to the protective function hard pressure plate 1LP9 of protection 1, then to the switch relay TJA1, then to the primary I bus knife switch 1YQJ, and finally to the negative terminal of the failure protection device M1 through the 024 circuit; if it is not on , it means that there is a broken circuit in the circuit, and the way out needs to be checked;

Step 6: Carry out verification. At this time, continue to invest in other protective function hard press plates 1LP10 corresponding to B in the first relay protection device M3, and protection function hard press plates 1LP11 in the first relay protection device M3 of phase C, and inject at the same time The corresponding current and voltage make the switch relays TJB1 and TJC1 in the first relay protection device M3 close and the corresponding overcurrent protection contacts LJB1 and LJC1 in the overcurrent protection device M2 close, and observe whether the failure protection device M1 appears only A-phase The light corresponding to "failure to start" is on, but the other lights corresponding to "failure to start" are not on; if other lights corresponding to "failure to start" are on, it means that there is a parasitic circuit in the circuit, and the way out needs to be checked;

Step 7. Continue verification. At this time, exit the protection function hard pressure plate 1LP9 in the first relay protection device M3, and repeat the test from steps 2 to 3. If A appears in the failure protection device M1, the light corresponding to "start failure" is on. , it means that there is a parasitic loop in the loop, and the way out needs to be checked;

Step 8, continue to verify, disconnect the I bus knife switch 1YQJ, repeat the test from the 2nd to the 3rd step, if the failure protection device M1 appears A and the corresponding "start failure" light is on, it means that there is a parasitic circuit in the circuit. need to check the way out;

Step 9: Simulate the closing of the primary II bus knife switch 2YQJ of this line, so that the primary II bus knife switch 2YQJ is closed.

Step 10: Repeat the test from Step 2 to Step 3 to observe whether the failure protection device M1 has A corresponding to the "start failure" light on. If the light is on, it means that the start failure of the corresponding phase A is successful. The reason is that the circuit is connected correctly. Finally, the positive potential of the failure protection device M1 passes through the 01 circuit to the overcurrent protection contact LJA1, then to the protection function hard pressure plate 1LP9 of protection 1, then to the switch relay TJA1, to the primary II bus knife switch 2YQJ, and finally to the failure circuit through the 025 circuit The negative terminal of the protection device M1; if it is not lit, it means that there is a broken circuit in the circuit, and the way out needs to be checked;

Step 11. Disconnect primary II bus knife switch 2YQJ, and repeat steps 2 to 3. If the failure protection device M1 appears A and the corresponding "start failure" light is on, it means that there is a parasitic circuit in the circuit, and the way out needs to be checked. .

It should be noted that, by analogy, phases B, C, AB, BC, and ABC in the first relay protection device M3 and phases A, B, and C in the first relay protection device M3 , AB phase, BC phase, and ABC phase all adopt the method of A phase in the first relay protection device M3, which will not be repeated here.

Taking the relay TJQ as an example, the application scenarios of the operation box operation circuit M5 are as follows:

The first step is to put the protective function hard pressure plates of all devices in the exit state, the overcurrent protection contacts are all turned off, and all the switch relays and relays are turned off;

The second step is to add A, B, and C three-phase overcurrent protection terminals to add analog test, so that the corresponding overcurrent protection contacts LJA2, LJB2, and LJB3 in the overcurrent protection device M2 are closed;

The third step is to only put into the protective function hard pressure plate LP in the operation circuit M5 of the operation box, and the rest of the pressure plates are all maintained in the exit state;

The fourth step is to short-circuit other protection contacts, so that the other protection contacts 1 in the operating circuit M5 of the operation box start the circuit action, and then close the relay TJQ;

The fifth step is to keep simulating the closure of the primary I bus knife switch 1YQJ of the line, so that the primary I bus knife switch 1YQJ is closed. Or simulate the closing of the primary II bus knife switch 2YQJ of this line, so that the primary II bus knife switch 2YQJ is closed;

Step 6. Observe whether the failure protection device M1 has the ABC three-phase corresponding "start failure" light on. If the light is on, it means that the start failure is successful. The reason is that after the circuit is connected correctly, the positive potential of the failure protection device M1 passes through the 01 circuit to the series Connected overcurrent protection contacts LJA2, LJB2, LJC2, then to the protection function hard pressure plate LP, then to the first I bus knife switch 1YQJ or the first II bus knife switch 2YQJ, and finally to the negative terminal of the failure protection device M1 through the 024 loop or 025 loop , if it is not on, it means that there is a broken circuit in the circuit, and the way out needs to be checked. The result will be logged

The seventh step is to verify, exit the protection function of the hard pressure plate LP, and put the rest of the pressure plates in the same exit state, repeat the fourth to fifth steps of the test, if the failure protection device M1 appears ABC three-phase corresponding "start failure" light is on , it means that there is a parasitic loop in the loop, and the way out needs to be checked;

It should be noted that, by analogy, the relay TJR adopts a method similar to that of the relay TJQ, which will not be repeated here.

Implementing the embodiment of the present invention has the following beneficial effects:

In the present invention, firstly, the connection between the failure protection device and the primary I bus knife switch and the primary II bus knife switch is short-circuited, and the protection action to be realized on the first relay protection device or the second relay protection device is used to control After the overcurrent protection device loads the corresponding overcurrent to close the corresponding overcurrent protection contact and loads the voltage setting value and current setting value on the first relay protection device or the second relay protection device to close the corresponding switch relay, the failure occurs The protection device is loaded with the test results generated by the test signal to complete the line verification between the first relay protection device or the second relay protection device and the overcurrent protection device; secondly, disconnect the first relay protection device, the second relay protection device The connection between the electrical protection device and the failure protection device, control the overcurrent protection device to load the corresponding overcurrent to close the corresponding overcurrent protection contact, and control the action of the protection contact connected to the operation circuit end of the operation box to close the corresponding relay , complete the line verification between the operation box operation circuit and the overcurrent protection device by loading the test results generated by the test signal through the failure protection device; finally, disconnect the failure protection device and the primary I bus knife switch closure and the primary II bus knife switch The short-circuit connection between them controls the closure of the primary I bus knife switch or the primary II bus knife switch, and whether the test result generated by loading the test signal with the failure protection device continues to maintain the failure to start successfully to complete the failure protection device and the primary I bus. The connection verification between the knife switch and the primary II bus knife switch can be verified on site to find out problems such as wiring errors or missing wiring or damage to the protective function of the hard pressure plate, so as to detect hidden dangers in time and provide a guarantee for the safe operation of power grid transmission lines. Assure.

Those of ordinary skill in the art can understand that all or part of the steps in the method of the above-mentioned embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage Media such as ROM/RAM, magnetic disk, optical disk, etc.

The above disclosures are only preferred embodiments of the present invention, and certainly cannot limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.

Claims (9)

1. A method for on-site verification of a power grid transmission line circuit breaker failure protection starting circuit, which is used to include a failure protection device, an overcurrent protection device, a first relay protection device, a second relay protection device, an operation box operation circuit, a primary On the circuit breaker failure protection starting circuit of the I bus knife switch and the primary II bus knife switch, it is characterized in that the method includes the following steps: When it is determined that both the primary I bus knife switch and the primary II bus knife switch are in the disconnected state, connect the common parallel point between the primary I bus knife switch and the primary II bus knife switch through one end, and the other One end is connected to the wire of the failure protection device to realize short circuit; After the short-circuiting is completed, set the first protective relay device, the second protective relay device, and all protective function hard pressing plates on the operating circuit of the operation box to the exit state and turn the overcurrent protection All overcurrent protection contacts on the device are initially disconnected, and the first relay protection device or the second relay protection device is selected as the relay protection device to be operated, and the relay protection device to be operated is further determined The current protection action to be implemented on the protection device; wherein, the protection action to be implemented includes A-phase single-phase protection action, B-phase single-phase protection action, C-phase single-phase protection action, and any combination of any two of ABC three-phase The formed two-phase protection action and ABC three-phase protection action; According to the current protection action to be implemented on the relay protection device to be operated, determine the selected over-current protection contact on the over-current protection device and the selected over-current protection contact correspondingly connected to the relay protection device to be operated The protective function of the hard press plate and the switch relay, and by controlling the closure of the selected over-current protection contact of the over-current protection device and connecting the protection function hard press plate on the relay protection device to be operated to enter the input state and the switch relay is closed. After starting the protection action currently to be implemented on the relay protection device to be operated, load a test signal to the failure protection device, and further if it is determined that the failure protection device has been loaded with the test signal, the test result generated is start If the failure is successful, it is verified that the failure protection device on the circuit breaker failure protection startup circuit and the overcurrent protection device and its selected overcurrent protection contacts are correspondingly connected to the protection function on the relay protection device to be operated All wiring connections between hard plate and switching relay are correct. 2. The power grid transmission line circuit breaker failure protection start-up loop on-site verification method according to claim 1, characterized in that, the method further comprises: If it is determined that the failure protection device has been loaded with the test signal and the test result generated by the test signal is failure to start, then verify the failure protection device and the overcurrent protection device on the circuit breaker failure protection start circuit and their The selected overcurrent protection contact corresponds to at least one error in all line connections between the protective function hard pressure plate and the switch relay on the relay protection device to be operated, and further adjusts the circuit breaker failure protection start circuit. The failure protection device is connected to the overcurrent protection device and its selected overcurrent protection contacts correspondingly, until the faulty line connection between the protection function hard press plate on the relay protection device to be operated and the switching relay is correct. 3. The grid transmission line circuit breaker failure protection start-up loop on-site verification method according to claim 1 or 2, characterized in that the method further comprises: Disconnect the connection lines between the first relay protection device and the second relay protection device and the failure protection device respectively, and control the closure of all over-current protection contacts on the over-current protection device and the After the protection function hard pressing plate on the operating circuit of the operation box enters the input state and at least one relay is closed, load the test signal to the failure protection device, and further if it is determined that the failure protection device has been loaded with the test signal generated by the test signal As a result, the start-up failure is successful, and it is verified that all connections between the failure protection device, the overcurrent protection device and the operation circuit of the operation box on the circuit breaker failure protection start-up circuit are correct. 4. The grid transmission line circuit breaker failure protection starting loop on-site verification method according to claim 3, characterized in that, the method further comprises: If it is determined that the failure protection device has been loaded with the test signal and the test result generated is failure to start, then it is verified that the failure protection device, the overcurrent protection device and the There is at least one error in the line connection between the operation circuit of the operation box, and there is an error between the failure protection device on the circuit breaker failure protection starting circuit, the overcurrent protection device and the operation circuit of the operation box. The line connection is correct. 5. The grid transmission line circuit breaker failure protection start-up loop on-site verification method according to claim 1 or 3, characterized in that the method further comprises: Disconnect one end of the wire connecting the common parallel contact between the primary I bus switch and the primary II bus switch and the other end connected to the failure protection device, and control the closing of the primary I bus switch and the If the primary II bus switch is disconnected, if it can be determined that the failure protection device has been loaded with the test signal generated by the test result and continues to be a successful start-up failure, then determine the distance between the primary I bus switch and the failure protection device. All line connections between are correct; On the contrary, if it is determined that the failure protection device has been loaded with the test result generated by the test signal, the failure to start is successfully changed to failure to start, then it is determined that the primary I bus knife switch and the There is at least one error in the line connection between the failure protection devices, and the wrong line connection between the failure protection device and the primary I-bus knife switch is further adjusted to be correct. 6. The grid transmission line circuit breaker failure protection starting loop on-site verification method according to claim 5, characterized in that, the method further comprises: Controlling the disconnection of the primary I bus knife switch and the closing of the primary II bus knife switch, if it can be determined that the failure protection device has been loaded with the test signal and the test result generated by the test signal continues to maintain the startup failure success, then determine the All line connections between the primary II bus knife switch and the failure protection device are correct; on the contrary, if it is determined that the failure protection device has been loaded with the test signal and the test result generated by the test signal is changed from a successful startup failure to a startup failure failure, Then determine that there is at least one error in the line connection between the primary II bus knife switch and the failure protection device, and further adjust the wrong line connection between the failure protection device and the primary II bus knife switch to be correct until. 7. The grid transmission line circuit breaker failure protection starting loop on-site verification method as claimed in claim 1, characterized in that, the corresponding switch relays on the first relay protection device and the second relay protection device respectively Closing is realized by loading the corresponding voltage setting value and current setting value on each switch relay and its corresponding circuit connected to the protective function hard pressure board. 8. The grid transmission line circuit breaker failure protection start-up loop on-site verification method as claimed in claim 1, characterized in that, the closure of each overcurrent protection contact on the overcurrent protection device is achieved by loading a corresponding overcurrent Achieved. 9. The on-site verification method for the circuit breaker failure protection start-up circuit of the power grid transmission line as claimed in claim 3, wherein the closing of the two relays on the operating circuit of the operation box is performed by the action of the protection contact connected to the front end of the operation box Achieved.