CN112881832A - Relay protection circuit calibration system - Google Patents
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Abstract
The invention provides a relay protection circuit checking system, which comprises: the relay protection calibration circuit comprises a main control chip, a relay protection calibration circuit and an acquisition circuit, wherein the types of the relay protection calibration circuit are various; the output end of the main control chip is connected with the relay protection calibration loop to control the relay protection calibration loop to perform calibration; the input end of the acquisition circuit is connected with the relay protection calibration circuit and is used for acquiring the calibration result of the relay protection calibration circuit; the output end of the acquisition circuit is connected with the input end of the main control chip and used for sending the verification result to the main control chip. By the relay protection circuit verification system provided by the embodiment of the invention, the master control chip can realize the verification of the relay protection circuit based on various relay protection verification circuits, so that the integrated verification is realized; the tester can check various relay protection circuits based on the relay protection circuit checking system, is time-saving and labor-saving, facilitates the on-site checking of the checker, and is very convenient and efficient.
Description
Technical Field
The invention relates to the technical field of relay protection, in particular to a relay protection loop checking system.
Background
The relay protection is a first defense line for safe and reliable operation of a power grid, and the correctness of a loop of the relay protection is directly related to the stable operation of a power system. The relay protection equipment of national main network transformer substations can reach 1780 and more than ten thousand, the conventional relay protection circuit verification mainly depends on manual operation, the automation degree is low, the reliability is poor, and the work energy efficiency cannot meet the verification requirement of rapid increase of power equipment, so that the verification of the relay protection circuit of the power system must be completed by adopting an advanced intelligent verification means, so that the labor intensity is reduced, the work efficiency is improved, and the personnel safety is enhanced.
At present, relay protection circuit verification mostly relates to verification of a single functional circuit. However, the checking in the single-function loop process cannot find the common problem among the loops, the functions are all single, and the expansibility is poor. In addition, the disadvantage that different devices are needed for checking different loops exists, so that comprehensive decision analysis is difficult to perform on the result data after checking. In the checking process, on one hand, checking personnel frequently replace checking equipment, which wastes time and labor and has low checking efficiency; on the other hand, the check result has a single purpose, and operation and maintenance personnel cannot make complete judgment and analysis of comprehensive information on the whole relay protection circuit.
Disclosure of Invention
In order to solve the above problems, an embodiment of the present invention provides a relay protection circuit calibration system.
The embodiment of the invention provides a relay protection loop checking system, which is characterized by comprising the following components: the relay protection calibration circuit comprises a main control chip, a relay protection calibration circuit and an acquisition circuit, wherein the types of the relay protection calibration circuit are various;
the output end of the main control chip is connected with the relay protection calibration loop to control the relay protection calibration loop to perform calibration;
the input end of the acquisition circuit is connected with the relay protection calibration circuit and is used for acquiring the calibration result of the relay protection calibration circuit; and the output end of the acquisition circuit is connected with the input end of the main control chip and used for sending the check result to the main control chip.
In one possible implementation manner, the relay protection calibration circuit includes: the circuit breaker is characterized by comprising one or more of a circuit breaker anti-tripping and closing coil voltage checking circuit, a circuit breaker non-full-phase time checking circuit, a mutual inductor polarity checking circuit and a temperature acquisition checking circuit.
In a possible implementation manner, in a case that the relay protection calibration circuit includes the circuit breaker tripping and closing coil voltage calibration circuit, the circuit breaker tripping and closing coil voltage calibration circuit includes: the device comprises a switching-on variable resistor, a tripping variable resistor, a first switch, a second switch, a switching-on switch, an anti-tripping relay, a voltage type anti-tripping latching relay, a switching-on holding relay, a protective tripping contact, a switching-on coil and a tripping coil;
one end of the closing switch is connected with the high level, and the other end of the closing switch is connected with a first end point;
one end of a coil of the closing holding relay is connected with the first end point through a normally closed contact of the voltage type anti-tripping latching relay, and the other end of the coil of the closing holding relay is connected with the second end point; one end of a normally open contact of the closing holding relay is connected with a high level, and the other end of the normally open contact of the closing holding relay is connected with the first endpoint;
one end of the closing coil is connected with the second end point through a normally closed contact of the breaker, and the other end of the closing coil is connected with a low level;
one end of a coil of the voltage type anti-tripping latching relay is connected with the first endpoint, and the other end of the coil is connected with a low level through a normally open contact of the voltage type anti-tripping latching relay and a first normally open contact of the anti-tripping relay which are connected in parallel;
one end of the protection tripping contact is connected with a high level, and the other end of the protection tripping contact is connected with a third end point;
one end of a coil of the anti-tripping relay is connected with the third end point, and the other end of the coil of the anti-tripping relay is connected with the fourth end point; one end of a second normally open contact of the anti-tripping relay is connected with a high level, and the other end of the second normally open contact of the anti-tripping relay is connected with the third end point;
one end of the tripping coil is connected with the fourth end point through a normally open contact of the circuit breaker, and the other end of the tripping coil is connected with a low level;
the first output end of the main control chip is connected with the first end point; one end of the switching-on variable resistor is connected with a high level, and the other end of the switching-on variable resistor is connected with the second end point through the first switch;
the second output end of the main control chip is connected with the third endpoint; one end of the tripping variable resistor is connected with a high level, and the other end of the tripping variable resistor is connected with the second endpoint through the second switch.
In a possible implementation manner, the circuit breaker tripping-prevention and tripping-and-closing coil voltage calibration loop further includes: the system comprises a jump position monitoring relay, a first indicator light, a closed position monitoring relay and a second indicator light;
one end of the jump position monitoring relay is connected with a high level through the first indicator light, and the other end of the jump position monitoring relay is connected with the second endpoint;
and one end of the on-position monitoring relay is connected with a high level through the first indicator lamp, and the other end of the on-position monitoring relay is connected with the fourth end point.
In one possible implementation, the main control chip is configured to:
when the circuit breaker is in an off-position state, under the condition that the resistance value of the switching-on variable resistor is greater than a first preset value, controlling the first switch to be closed and keeping the first switch closed; then gradually reducing the resistance value of the switching-on variable resistor until switching-on action is triggered or the resistance value of the switching-on variable resistor is zero; under the condition that a switching-on action can be triggered, determining that the switching-on coil is normal, and recording a first resistance value, wherein the first resistance value is the resistance value of the switching-on variable resistor when the switching-on action is triggered;
when the circuit breaker is in a closed state, under the condition that the resistance value of the tripping variable resistor is greater than a second preset value, the second switch is controlled to be closed, and the second switch is kept closed; then gradually reducing the resistance value of the tripping variable resistor until tripping action is triggered or the resistance value of the tripping variable resistor is zero; under the condition that a tripping action can be triggered, determining that the tripping coil is normal, and recording a second resistance value, wherein the second resistance value is the resistance value of the tripping variable resistor when the tripping action is triggered;
if the switching-on coil and the tripping coil are normal, the first output end of the main control chip continuously outputs a high level to the first end point, then the second output end of the main control chip continuously or discontinuously outputs a high level to the third end point, and if the circuit breaker does not have a forward composite tripping phenomenon, the tripping-prevention loop is determined to be normal;
and determining tripping and closing information according to the first resistance value, the second resistance value, the internal resistance of the closing coil and the internal resistance of the tripping coil, wherein the tripping and closing information comprises one or more of closing voltage, tripping voltage and tripping and closing coil voltage ratio.
In one possible implementation, the circuit breaker non-full-phase time verification loop includes: a first switch assembly and a second switch assembly;
the first switch assembly comprises a normally open contact of a first-phase circuit breaker, a normally open contact of a second-phase circuit breaker and a normally open contact of a third-phase circuit breaker which are arranged in parallel, and the second switch assembly comprises a normally closed contact of the first-phase circuit breaker, a normally closed contact of the second-phase circuit breaker and a normally closed contact of the third-phase circuit breaker which are arranged in parallel;
after the first switch component and the second switch component are connected in series, one end of the first switch component is connected with the third output end of the main control chip, and the other end of the first switch component is connected with the first input end of the main control chip;
the third output end of the main control chip is used for continuously outputting the timing level, and the time length of the first input end of the main control chip continuously receiving the timing level is three-phase non-full-phase action time.
In one possible implementation, the transformer polarity check loop includes: the detection circuit comprises a power supply, a detection switch, a first light emitting diode, a second light emitting diode, a first detection end, a second detection end, a third detection end and a fourth detection end;
a first pole of the power supply is connected with the first detection end through the detection switch, and a second pole of the power supply is connected with the second detection end;
the anode of the first light-emitting diode is connected with the third detection end, and the cathode of the first light-emitting diode is connected with the fourth detection end; the anode of the second light-emitting diode is connected with the fourth detection end, and the cathode of the second light-emitting diode is connected with the third detection end;
the first detection end and the second detection end are used for being connected with a first coil of a tested mutual inductor, and the third detection end and the fourth detection end are used for being connected with a second coil of the tested mutual inductor.
In one possible implementation, the temperature acquisition verification loop includes: the temperature acquisition circuit and the duplex potentiometer are connected;
the first resistance end of the duplex potentiometer is connected with the temperature acquisition circuit in series, and the second resistance end of the duplex potentiometer is used for being connected with the main transformer temperature sampling secondary circuit in series;
the output resistance of the first resistance end and the second resistance end of the duplex potentiometer is the same and can be changed synchronously.
In a possible implementation manner, the main control chip is provided with an expansion interface for connecting other relay protection calibration circuits.
In a possible implementation manner, the relay protection circuit verification system further includes a display screen;
the display screen is connected with the output end of the main control chip and used for displaying the checking result.
In the scheme provided by the embodiment of the invention, the master control chip can realize the verification of the relay protection circuit based on various relay protection verification circuits, thereby realizing the integrated verification; the testing personnel can carry out the calibration to multiple relay protection circuit based on this relay protection circuit calibration system, does not need testing personnel to change check-up equipment frequently, and labour saving and time saving makes things convenient for the testing personnel to carry out the on-the-spot check-up, and is very convenient, high-efficient, has promoted test efficiency greatly. According to the voltage calibration loop of the tripping and switching coil of the circuit breaker, automatic control of tripping and switching is realized through the main control chip, so that sequential operation of tripping test is realized, and the tripping function can be calibrated; meanwhile, the related information of the tripping and closing coil voltage can be determined, the correctness of the tripping and closing voltage can be verified at the same time, and two functions (tripping and closing prevention voltage) are verified at one time. The circuit breaker non-full-phase time checking circuit is realized by utilizing the series-parallel connection relation of auxiliary contacts in a mechanism box of the circuit breaker, the non-full-phase action principle can be simulated, the switch on-off state is simulated through the contacts for testing, and the purpose of determining the three-phase non-full-phase action time under the condition of not modifying a secondary circuit can be achieved. The checking circuit does not need to carry out a transmission test, can save a large amount of time, and greatly reduces the working strength.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 shows a first structural schematic diagram of a relay protection loop verification system provided in an embodiment of the present invention;
fig. 2 shows a second schematic structural diagram of the relay protection circuit verification system provided in the embodiment of the present invention;
fig. 3 shows a first circuit schematic diagram of a voltage calibration loop of an anti-tripping and closing coil of a circuit breaker according to an embodiment of the present invention;
fig. 4 shows a second circuit schematic diagram of a voltage calibration circuit of an anti-tripping and closing coil of a circuit breaker according to an embodiment of the present invention;
fig. 5 shows a schematic circuit diagram of a non-full-phase time verification loop of a circuit breaker according to an embodiment of the present invention;
fig. 6 shows a schematic circuit diagram of a transformer polarity check loop provided by an embodiment of the present invention.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
An embodiment of the present invention provides a relay protection loop verification system, as shown in fig. 1, including: the relay protection verification system comprises a main control chip 10, a relay protection verification loop 20 and an acquisition circuit 30, wherein the types of the relay protection verification loop 20 are various, and three types are exemplified in fig. 1. As shown in fig. 1, the output end of the main control chip 10 is connected to the relay protection calibration loop 20, and controls the relay protection calibration loop 20 to perform calibration; the input end of the acquisition circuit 30 is connected to the relay protection calibration circuit 20, and is used for acquiring the calibration result of the relay protection calibration circuit 20; the output end of the acquisition circuit 30 is connected to the input end of the main control chip 10, and is used for sending the verification result to the main control chip 10.
In the embodiment of the present invention, the master control chip 10 controls multiple relay protection calibration circuits 20 at the same time, so that the calibration system can calibrate multiple relay protection circuits, and meanwhile, the acquisition circuit 30 can acquire calibration results, and finally, the master control chip 10 processes all calibration results. The main control chip 10 may be a DSP (Digital Signal processing) control chip, such as a DSP control chip like TMS28335, and sets a plurality of relay protection check circuits 20 by combining a basic working principle of the relay protection circuit, and each relay protection check circuit 20 checks a corresponding relay protection circuit.
The acquisition circuit 30 acquires the result of each check circuit after checking, and then transmits the result to the main control chip 10, wherein the acquisition circuit 30 may specifically include an amplification circuit, a filter circuit, etc., or may be only a wire, that is, directly transmits the check result of the relay protection check circuit 20 to the main control chip 10. A main program for data analysis may be embedded in the main control chip 10, for example, the main program implements data analysis by using an auxiliary decision analysis strategy; in addition, the analysis result can be exported, and secondary equipment operation and maintenance reference is provided for operation and maintenance personnel.
Optionally, referring to fig. 2, the relay protection verification circuit 20 specifically includes: one or more of a circuit breaker anti-tripping and closing coil voltage checking circuit 21, a circuit breaker non-full-phase time checking circuit 22, a mutual inductor polarity checking circuit 23 and a temperature acquisition checking circuit 24. In addition, the main control chip 10 is provided with an expansion interface for connecting other relay protection calibration circuits 20, so that based on actual needs, other relay protection calibration circuits 20 can be accessed, and the acquisition circuit 30 can acquire calibration results. The embodiment can add the checking circuit by arranging the expansion interface, can realize flexible expansion of the relay protection circuit checking system, and meets the checking requirement in the future, thereby greatly improving the flexibility of the system.
Optionally, referring to fig. 2, the relay protection circuit verification system may further include a display screen 40; the display screen 40 is connected to the output end of the main control chip 10 for displaying the verification result.
In the embodiment of the present invention, after the main control chip 10 determines the verification result, the display screen 40 displays the verification result. Optionally, the display screen 40 may also be a touch display screen, and it may also send a control instruction to the main control chip 10, for example, start and stop the relay protection calibration circuit 20 or adjust device parameters therein through the control instruction in the calibration process. For example, the display screen 40 includes an S3C4480X microprocessor and an LCD touch screen, wherein the main control chip 10 transmits the result of the decision-making auxiliary analysis to the S3C4480X microprocessor in a serial manner. The LCD touch screen provides an interface directly participating in human-computer interaction, the interface for function selection and the result interface after decision analysis processing can be displayed through the LCD touch screen, and the LCD touch screen can be operated by utilizing virtual keys. The man-machine interactive display screen 40 can conveniently complete the integrated operation of the checking system by utilizing the good man-machine interactive capability thereof.
According to the relay protection circuit verification system provided by the embodiment of the invention, the main control chip 10 can realize the verification of the relay protection circuit based on various relay protection verification circuits 20, so that the integrated verification is realized; the testing personnel can carry out the calibration to multiple relay protection circuit based on this relay protection circuit calibration system, does not need testing personnel to change check-up equipment frequently, and labour saving and time saving makes things convenient for the testing personnel to carry out the on-the-spot check-up, and is very convenient, high-efficient, has promoted test efficiency greatly.
On the basis of the above embodiment, referring to fig. 3, the circuit breaker trip prevention and trip closing coil voltage verification circuit 21 includes: the automatic tripping device comprises a closing variable resistor R1, a tripping variable resistor R2, a first switch K1, a second switch K2, a closing switch KK, an anti-tripping relay TBJ, a voltage type anti-tripping latching relay TBJV, a closing holding relay HBJ, a protective tripping contact BTJ, a closing coil HC and a tripping coil TQ.
As shown in fig. 3, one end of the closing switch KK is connected to the high level, and the other end is connected to the first endpoint a; one end of a coil of the closing holding relay HBJ is connected with a first endpoint A through a normally closed contact of a voltage type anti-tripping latching relay TBJV, and the other end of the coil of the closing holding relay HBJ is connected with a second endpoint B; one end of a normally open contact of the closing holding relay HBJ is connected with a high level, and the other end of the normally open contact of the closing holding relay HBJ is connected with a first endpoint A; one end of the closing coil HC is connected to the second end B through the breaker normally closed contact S1, and the other end is connected to the low level.
One end of a coil of the voltage type anti-jump lockout relay TBJV is connected with a first endpoint A, and the other end of the coil is connected with a low level through a normally open contact of the voltage type anti-jump lockout relay TBJV and a first normally open contact TBJ1 of the anti-jump relay TBJ which are connected in parallel.
One end of the protection tripping contact BTJ is connected with a high level, and the other end of the protection tripping contact BTJ is connected with a third endpoint C; one end of a coil of the anti-tripping relay TBJ is connected with the third end point C, and the other end is connected with the fourth end point D; one end of a second normally open contact TBJ2 of the anti-tripping relay TBJ is connected with a high level, and the other end of the second normally open contact is connected with a third end point C; one end of the trip coil TQ is connected to the fourth end point D through the normally open contact S2 of the circuit breaker, and the other end is connected to the low level.
A first output end of the main control chip 10 is connected with a first endpoint a; one end of the switching-on variable resistor R1 is connected with high level, and the other end is connected with a second endpoint B through a first switch K1; the second output end of the main control chip 10 is connected with the third endpoint C; one end of the trip variable resistor R2 is connected to a high level, and the other end is connected to the second terminal B through the second switch K2.
In the embodiment of the invention, the circuit 21 for checking the voltage of the tripping and switching coil of the circuit breaker leads out four endpoints, namely a first endpoint a, a second endpoint B, a third endpoint C and a fourth endpoint D, on the basis of the tripping-preventing loop, so that the checking on the tripping-preventing loop is realized, and meanwhile, whether the voltage of the switching and switching coil is normal can be checked. As shown in FIG. 3, the endpoint 11KD13 can be regarded as the first endpoint A, the endpoint 11KD20 or 11KD21 can be regarded as the second endpoint B, the endpoint 11KD9 can be regarded as the third endpoint C, and the endpoint 11KD17 or 11KD18 can be regarded as the fourth endpoint D. The master control chip 10 controls the four terminals A, B, C, D to implement corresponding verification functions. The high level and the low level are mutually concepts, that is, the high level is higher than the low level, for example, the high level may be +12V, 5V, 3V, etc., and the low level may be 0 or-3V, etc., and the present embodiment does not limit specific values of the two. Fig. 3 illustrates an example in which the high level is positive and the low level is negative.
The operation principle of the tripping and tripping coil voltage checking circuit 21 of the circuit breaker is described in detail below.
In the embodiment of the invention, the breaker is in an open position state (not closed) or a closed position state (closed), and the closing coil HC and the tripping coil TQ can control the state of the breaker; when the closing coil HC is electrified, the breaker is in a closing state; when the tripping coil TQ is electrified, the circuit breaker is in a separated state. When a control handle (such as a closing switch KK) of the circuit breaker is at a closing position, a closing control loop is switched on, so that a closing coil HC is electrified; if the line has a fault at present, the relay protection device acts to trip the breaker; however, the control handle is always in the on position, so that the circuit breaker is reclosed and re-tripped … …, that is, repeated tripping and closing are called as "jumping", and at this time, a tripping prevention loop is generally arranged to prevent the phenomenon.
Referring to fig. 3, when the circuit breaker is in the off-position state, the normally closed contact S1 is closed, and the normally open contact S2 is opened. After the closing switch KK is closed, the first end point A is connected with positive electricity; because the normally closed contact of the TBJV is in a closed state at the point where the coil of the voltage type anti-tripping latching relay TBJV is not located, the second end point A is also connected with positive electricity, and then the closing coil HC is electrified; then, the circuit breaker is in the closed state, and the normally closed contact S1 is opened, so that the closing operation does not need to be continuously performed (the closing coil HC is not energized).
If the circuit breaker is in the closed state, the normally open contact S2 is closed. When a fault exists in the line currently, the relay protection device acts to close the protection tripping contact BTJ, the third end point C is connected with positive electricity, and the fourth end point D is connected with positive electricity; the closed S2 enables the coil TQ of the tripping coil and the coil of the anti-tripping relay TBJ to be electrified; the coil of the anti-tripping relay TBJ gets electricity, the first normally open contact TBJ1 of the anti-tripping relay TBJ is closed, so that the coil of the voltage type anti-tripping latching relay TBJV gets electricity, the TBJV normally open contact is closed, so that the TBJV coil can get electricity all the time, and the normally closed contact of the TBJV is disconnected, thereby disconnecting the switching-on control circuit and making the switching-on coil HC not get electricity. Meanwhile, the second normally open contact TBJ2 of the voltage type anti-trip blocking relay TBJV is also closed, and the fourth terminal D is kept positive even if the protection trip contact BTJ is opened. In addition, the trip coil TQ which is electrified can trigger the execution of the trip action, the breaker becomes the stepping state, S2 is disconnected, and the trip coil TQ is not electrified. In conclusion, when the protection tripping contact BTJ is closed, even if the closing switch KK is closed, the closing coil HC and the tripping coil TQ are not electrified, and reciprocating jumping can be avoided.
In the embodiment of the present invention, the first output terminal of the main control chip 10 is connected to the first endpoint a; one end of the switching-on variable resistor R1 is connected with high level, and the other end is connected with a second endpoint B through a first switch K1; the second output end of the main control chip 10 is connected with the third endpoint C; one end of the trip variable resistor R2 is connected to a high level, and the other end is connected to the second terminal B through the second switch K2. The main control chip 10 realizes the anti-skip check by controlling the first output end, the second output end, the first switch K1 and the second switch K2.
Specifically, the main control chip 10 is specifically configured to perform the following processes:
step A1: when the circuit breaker is in an off-position state, under the condition that the resistance value of the switching-on variable resistor R1 is larger than a first preset value, controlling the first switch K1 to be closed and keeping the first switch K1 to be closed; then gradually reducing the resistance value of the switching-on variable resistor R1 until the switching-on action is triggered or the resistance value of the switching-on variable resistor R1 is zero; under the condition that the closing action can be triggered, the closing coil HC is determined to be normal, and a first resistance value is recorded, wherein the first resistance value is the resistance value of the closing variable resistor R1 when the closing action is triggered.
In the embodiment of the invention, when the circuit breaker is in the off-position state, if the closing switch KK is turned off, the resistance value of the closing variable resistor R1 is first adjusted to be greater than a first preset value, for example, the resistance value of R1 is a full resistance value or another larger value. At this time, the main control chip 10 controls the first switch K1 to be closed, keeps the first switch K1 closed, and gradually reduces the resistance value of the closing variable resistor R1, at this time, due to the voltage dividing effect of R1, the smaller the resistance value of R1 is, the higher the voltage value at the second end point B is, and when the voltage value at the second end point B is higher than the closing voltage of the closing coil HC, the closing coil HC may be caused to trigger the closing action, and it can be stated that the closing coil HC is normal. If the closing variable resistor R1 becomes zero and the closing operation is not yet triggered, it indicates that the closing coil HC is abnormal.
Meanwhile, the resistance of the closing variable resistor R1 just triggering the closing action is recorded as the first resistance. For example, the closing variable resistor R1 gradually decreases, and the current resistance value becomes R1When the switch-on action is triggered, the first resistance is R1。
Step A2: when the circuit breaker is in a closed state, under the condition that the resistance value of the tripping variable resistor R2 is greater than a second preset value, the second switch K2 is controlled to be closed, and the second switch K2 is kept closed; then gradually reducing the resistance value of the tripping variable resistor R2 until the tripping action is triggered or the resistance value of the tripping variable resistor R2 is zero; under the condition that the tripping action can be triggered, the tripping coil TQ is determined to be normal, and a second resistance value is recorded, wherein the second resistance value is the resistance value of the tripping variable resistor R2 when the tripping action is triggered.
In the embodiment of the present invention, similar to the process of checking the closing coil HC described above, the second switch K2 is kept closed in the embodimentAnd gradually reducing the resistance value of the tripping variable resistor R2 to realize verification. If the tripping action can be triggered, the condition that the tripping coil TQ is normal is described; the value of the trip variable resistor R2 is a second value R when the trip action is triggered2。
Step A3: if both the closing coil HC and the tripping coil TQ are normal, the first output end of the main control chip 10 continuously outputs a high level to the first endpoint a, and then the second output end of the main control chip 10 continuously or discontinuously outputs a high level to the third endpoint C, and if the circuit breaker does not have a forward composite tripping phenomenon, it is determined that the tripping-prevention loop is normal.
In the embodiment of the invention, the anti-hop loop is verified by accessing the output ends of the first endpoint A and the second endpoint. Specifically, the first output end of the main control chip 10 continuously outputs a high level to the first endpoint a, so that the closing of the closing switch KK can be simulated, and the circuit breaker is closed at the moment and is in a closing state; thereafter, the second output terminal of the main control chip 10 continuously outputs a high level to the third terminal C, so that it may simulate closing the protection trip contact BTJ. When the first end point is continuously at the high level, whether the third end point C is always at the high level (the circuit is always abnormal) or intermittently at the high level (the circuit is intermittently abnormal), if the reciprocating closing and tripping phenomena do not exist, the anti-tripping circuit is normal. Otherwise, the anti-tripping loop is abnormal and needs to be checked and maintained.
Step A4: and determining tripping and closing information according to the first resistance value, the second resistance value, the internal resistance of the closing coil HC and the internal resistance of the tripping coil TQ, wherein the tripping and closing information comprises one or more of closing voltage, tripping voltage and tripping and closing coil voltage ratio.
In the embodiment of the invention, assuming that the potential difference between the high level and the low level is V, the closing voltage V of the closing coil HC can be known according to the principle of resistance voltage division1Trip voltage v of trip coil TQ2Respectively as follows:
It should be noted that different components may be switched to different high levels when the high levels need to be switched. For example, the closing switch KK may be switched to a high level in the anti-tripping circuit, and the closing variable resistor R1 and the tripping variable resistor R2 may be switched to an external high level. Fig. 3 shows a schematic diagram only.
Optionally, referring to fig. 4, the circuit breaker trip and trip prevention coil voltage verification circuit 21 further includes: a jump monitor relay TWJ, a first indicator lamp L1, an on monitor relay HWJ, and a second indicator lamp L2. One end of the jump position monitoring relay TWJ is connected with a high level through a first indicator light L1, and the other end of the jump position monitoring relay TWJ is connected with a second endpoint B; one end of the on-position monitoring relay HWJ is connected to a high level via a first indicator light L1, and the other end is connected to a fourth terminal D.
In the embodiment of the invention, when the closing coil HC can be powered on, the branch where the jump position monitoring relay TWJ and the first indicator light L1 are located is switched on, the first indicator light L1 is turned on, the jump position monitoring relay TWJ can also be powered on, and a corresponding closing signal can be acquired through a corresponding contact. Accordingly, the on-position monitor relay HWJ and the second indicator light L2 may also be turned on when the trip coil TQ is energized. The first indicator light L1 and the second indicator light L2 may be light emitting diodes.
According to the circuit for checking the voltage of the coil of the circuit breaker for preventing tripping and switching on, the automatic control of tripping and switching on is realized through the main control chip 10, so that the sequential operation of a tripping-prevention test is realized, and the tripping-prevention function can be checked; meanwhile, the related information of the tripping and closing coil voltage can be determined, the correctness of the tripping and closing voltage can be verified at the same time, and two functions (tripping and closing prevention voltage) are verified at one time.
Optionally, referring to fig. 5, the circuit breaker non-full phase time verification loop 22 includes: a first switch assembly and a second switch assembly. The first switch assembly comprises a normally open contact of a first-phase circuit breaker JA, a normally open contact of a second-phase circuit breaker JB, and a normally open contact of a third-phase circuit breaker JC which are arranged in parallel, and the second switch assembly comprises a normally closed contact of the first-phase circuit breaker JA, a normally closed contact of the second-phase circuit breaker JB and a normally closed contact of the third-phase circuit breaker JC which are arranged in parallel.
After the first switch component and the second switch component are connected in series, one end of the first switch component is connected with the third output end of the main control chip 10, and the other end of the first switch component is connected with the first input end of the main control chip 10 (the acquisition circuit 30 of the part can be a wire or a current-limiting resistor, etc.); the third output end of the main control chip 10 is configured to continuously output the timing level, and a duration of the timing level continuously received by the first input end of the main control chip 10 is a three-phase non-full-phase action time.
In the embodiment of the invention, the switch assembly (comprising the first switch assembly and the second switch assembly) is formed by utilizing the contacts of the three-phase circuit breaker, so that the starting time and the ending time of the timing can be conveniently determined. If all the normally closed contacts are opened when the three-phase circuit breakers JA, JB and JC are closed, the second switch assembly is opened; if the voltage levels are all in the separated positions, all normally open contacts are disconnected, the first switch assembly is disconnected at the moment, and the first input end of the main control chip 10 cannot receive the timing level under the two conditions.
If the three-phase short circuiter is the closed position initially, a certain phase circuit breaker in the three-phase circuit breaker is changed to the branch position by the closed position, or the normally open contact point that leads to this phase circuit breaker opens, normally closed contact is closed for first switch module and second switch module all switch on, and the timing level is started to be received to the first input of main control chip 10, begins the timing this moment. Then, sequentially changing other phase circuit breakers into sub-positions; when all the circuit breakers are in the separated position, as described above, the first input terminal of the main control chip 10 stops receiving the timing level, and the timing is ended at this time. Therefore, the time that the main control chip 10 can receive the timing level is the three-phase non-full-phase operation time.
In this embodiment, the circuit breaker non-full-phase time check circuit 22 is realized by using the series-parallel connection relationship of the auxiliary contacts in the mechanism box of the circuit breaker, the non-full-phase action principle can be simulated, and the three-phase non-full-phase action time can be determined without modifying the secondary circuit by simulating the switch on-off state through the contacts to perform a test. The checking circuit does not need to carry out a transmission test, can save a large amount of time, and greatly reduces the working strength.
Optionally, referring to fig. 6, the transformer polarity check circuit 23 includes: the LED driving circuit comprises a power supply P1, a detection switch KC1, a first light-emitting diode D1, a second light-emitting diode D2, a first detection end, a second detection end, a third detection end and a fourth detection end. A first pole (positive pole in fig. 6) of the power source P1 is connected to the first detection terminal (i) through the detection switch KC1, and a second pole (negative pole in fig. 6) is connected to the second detection terminal (ii). The anode of the first light-emitting diode D1 is connected with the third detection end and the cathode is connected with the fourth detection end; the anode of the second light emitting diode D2 is connected to the fourth detection terminal (c), and the cathode is connected to the third detection terminal (c).
The first detection end (i) and the second detection end (ii) are used for connecting a first coil (a first coil is shown by a straight line in fig. 6) of the tested mutual inductor, and the third detection end (i) and the fourth detection end (i) are used for connecting a second coil of the tested mutual inductor. For example, the first detection terminal (r) and the second detection terminal (r) may be connected to a primary coil of a transformer (e.g., a current transformer, a voltage transformer, etc.) to be tested, and the third detection terminal (r) and the fourth detection terminal (r) may be connected to a secondary coil of the transformer to be tested. Since the polarity of the power supply P1 and the two leds D1, D2 are fixed, the polarity of the transformer can be determined according to which led is lit. The main control chip 10 is used for controlling the on-off of the detection switch KC1, and the acquisition circuit 30 can acquire whether the two light emitting diodes D1 and D2 have current or emit light.
Take the connection structure shown in fig. 6 as an example. After the detection switch KC1 is closed, if the first light emitting diode D1 is bright, it is indicated that the first detection end (i) and the fourth detection end (i) of the transformer are homonymous ends, and the second detection end (i) and the third detection end (iii) of the transformer are homonymous ends; on the contrary, if the second light emitting diode D2 is on, it indicates that the first detection end (c) and the third detection end (c) of the transformer are the same name ends, and the second detection end (c) and the fourth detection end (c) are the same name ends.
Optionally, the transformer polarity check circuit 23 may further include a current direction sensing module, which determines the current flowing direction together with the first light emitting diode D1 and the second light emitting diode D2, and the output result of the current direction sensing module may be transmitted to the acquisition circuit 30. In addition, other types of power supplies P2 and switches KC2 can be arranged, such as a remote control switch KC2 and the like, other modes of control can be achieved, and standby can also be achieved.
Optionally, the temperature acquisition verification loop 24 comprises: the temperature acquisition circuit and the duplex potentiometer are connected; the first resistance end of the duplex potentiometer is connected with the temperature acquisition circuit in series, and the second resistance end of the duplex potentiometer is used for being connected with the main transformer temperature sampling secondary circuit in series; the first resistance end and the second resistance end of the duplex potentiometer have the same output resistance and can be synchronously changed.
In the embodiment of the invention, the duplex potentiometer can output two resistors which can be synchronously changed and have the same resistance value all the time, and the two resistors are respectively connected in series with the temperature acquisition circuit and a main transformer temperature sampling secondary circuit of the circuit breaker. Through changing the duplex potentiometre, can compare temperature acquisition circuit and main transformer temperature sampling secondary circuit, whether the temperature value that two circuits were gathered matches, or whether the change of the two matches to can confirm that main transformer temperature sampling secondary circuit is normal.
According to the relay protection circuit verification system provided by the embodiment of the invention, the main control chip 10 can realize the verification of the relay protection circuit based on various relay protection verification circuits 20, so that the integrated verification is realized; the testing personnel can carry out the calibration to multiple relay protection circuit based on this relay protection circuit calibration system, does not need testing personnel to change check-up equipment frequently, and labour saving and time saving makes things convenient for the testing personnel to carry out the on-the-spot check-up, and is very convenient, high-efficient, has promoted test efficiency greatly. According to the circuit breaker anti-tripping and closing coil voltage calibration loop, automatic control over tripping and closing is achieved through the main control chip 10, so that sequential operation of an anti-tripping test is achieved, and the anti-tripping function can be calibrated; meanwhile, the related information of the tripping and closing coil voltage can be determined, the correctness of the tripping and closing voltage can be verified at the same time, and two functions (tripping and closing prevention voltage) are verified at one time. The circuit breaker non-full-phase time checking circuit 22 is realized by utilizing the series-parallel connection relation of auxiliary contacts in a mechanism box of the circuit breaker, the non-full-phase action principle can be simulated, the switch on-off state is simulated through the contacts for testing, and the purpose of determining the three-phase non-full-phase action time under the condition of not modifying a secondary circuit can be achieved. The checking circuit does not need to carry out a transmission test, can save a large amount of time, and greatly reduces the working strength.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and the present invention shall be covered by the claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A relay protection loop verification system, comprising: the relay protection calibration circuit comprises a main control chip, a relay protection calibration circuit and an acquisition circuit, wherein the types of the relay protection calibration circuit are various;
the output end of the main control chip is connected with the relay protection calibration loop to control the relay protection calibration loop to perform calibration;
the input end of the acquisition circuit is connected with the relay protection calibration circuit and is used for acquiring the calibration result of the relay protection calibration circuit; and the output end of the acquisition circuit is connected with the input end of the main control chip and used for sending the check result to the main control chip.
2. The relay protection circuit verification system of claim 1, wherein the relay protection verification circuit comprises: the circuit breaker is characterized by comprising one or more of a circuit breaker anti-tripping and closing coil voltage checking circuit, a circuit breaker non-full-phase time checking circuit, a mutual inductor polarity checking circuit and a temperature acquisition checking circuit.
3. The relay protection circuit calibration system according to claim 2, wherein in a case where the relay protection calibration circuit includes the circuit breaker trip prevention and trip/close coil voltage calibration circuit, the circuit breaker trip prevention and trip/close coil voltage calibration circuit includes: the automatic tripping device comprises a closing variable resistor (R1), a tripping variable resistor (R2), a first switch (K1), a second switch (K2), a closing switch (KK), an anti-tripping relay (TBJ), a voltage type anti-tripping latching relay (TBJV), a closing holding relay (HBJ), a protective tripping contact (BTJ), a closing coil (HC) and a tripping coil (TQ);
one end of the closing switch (KK) is connected with a high level, and the other end of the closing switch (KK) is connected with a first end point;
one end of a coil of the closing holding relay (HBJ) is connected with the first end point through a normally closed contact of the voltage type anti-tripping latching relay (TBJV), and the other end of the coil of the closing holding relay (HBJ) is connected with the second end point; one end of a normally open contact of the closing holding relay (HBJ) is connected with a high level, and the other end of the normally open contact of the closing holding relay (HBJ) is connected with the first endpoint;
one end of the closing coil (HC) is connected with the second end point through a normally closed contact of the breaker, and the other end of the closing coil (HC) is connected with a low level;
one end of a coil of the voltage type anti-tripping latching relay (TBJV) is connected with the first end point, and the other end of the coil is connected with a low level through a normally open contact of the voltage type anti-tripping latching relay (TBJV) and a first normally open contact of the anti-tripping relay (TBJ) which are connected in parallel;
one end of the protection tripping contact (BTJ) is connected with a high level, and the other end of the protection tripping contact (BTJ) is connected with a third end point;
one end of a coil of the anti-tripping relay (TBJ) is connected with the third end point, and the other end of the coil is connected with the fourth end point; one end of a second normally open contact of the anti-tripping relay (TBJ) is connected with a high level, and the other end of the second normally open contact is connected with the third end point;
one end of the tripping coil (TQ) is connected with the fourth end point through a normally open contact of the breaker, and the other end of the tripping coil (TQ) is connected with a low level;
the first output end of the main control chip is connected with the first end point; one end of the switching-on variable resistor (R1) is connected with high level, and the other end of the switching-on variable resistor is connected with the second endpoint through the first switch (K1);
the second output end of the main control chip is connected with the third endpoint; one end of the tripping variable resistor (R2) is connected with high level, and the other end is connected with the second endpoint through the second switch (K2).
4. The relay protection circuit verification system according to claim 3, wherein the circuit breaker trip prevention and trip/close coil voltage verification circuit further comprises: a jump position monitoring relay (TWJ), a first indicator lamp (L1), an on position monitoring relay (HWJ) and a second indicator lamp (L2);
one end of the jump position monitoring relay (TWJ) is connected with a high level through the first indicator light (L1), and the other end of the jump position monitoring relay (TWJ) is connected with the second end point;
one end of the closing monitoring relay (HWJ) is connected with high level through the first indicator light (L1), and the other end is connected with the fourth end point.
5. The relay protection loop verification system according to claim 3 or 4, wherein the main control chip is configured to:
when the circuit breaker is in an open position state, under the condition that the resistance value of the closing variable resistor (R1) is greater than a first preset value, controlling the first switch (K1) to be closed, and keeping the first switch (K1) closed; then gradually reducing the resistance value of the switching-on variable resistor (R1) until switching-on action is triggered or the resistance value of the switching-on variable resistor (R1) is zero; determining that the switching-on coil (HC) is normal under the condition that switching-on action can be triggered, and recording a first resistance value, wherein the first resistance value is the resistance value of the switching-on variable resistor (R1) when the switching-on action is triggered;
when the circuit breaker is in a closed state, under the condition that the resistance value of the tripping variable resistor (R2) is greater than a second preset value, controlling the second switch (K2) to be closed and keeping the second switch (K2) closed; then gradually reducing the resistance value of the tripping variable resistor (R2) until tripping action is triggered or the resistance value of the tripping variable resistor (R2) is zero; under the condition that a tripping action can be triggered, determining that the tripping coil (TQ) is normal, and recording a second resistance value, wherein the second resistance value is the resistance value of the tripping variable resistor (R2) when the tripping action is triggered;
if the switching-on coil (HC) and the tripping coil (TQ) are normal, the first output end of the main control chip continuously outputs high level to the first end point, then the second output end of the main control chip continuously or discontinuously outputs high level to the third end point, and if the circuit breaker does not have a backward composite tripping phenomenon, the tripping-prevention loop is determined to be normal;
and determining tripping and closing information according to the first resistance value, the second resistance value, the internal resistance of the closing coil (HC) and the internal resistance of the tripping coil (TQ), wherein the tripping and closing information comprises one or more of closing voltage, tripping voltage and tripping and closing coil voltage ratio.
6. The relay protection circuit verification system of claim 2, wherein the circuit breaker non-full phase time verification circuit comprises: a first switch assembly and a second switch assembly;
the first switch assembly comprises a normally open contact of a first-phase circuit breaker (JA), a normally open contact of a second-phase circuit breaker (JB) and a normally open contact of a third-phase circuit breaker (JC) which are arranged in parallel, and the second switch assembly comprises a normally closed contact of the first-phase circuit breaker (JA), a normally closed contact of the second-phase circuit breaker (JB) and a normally closed contact of the third-phase circuit breaker (JC) which are arranged in parallel;
after the first switch component and the second switch component are connected in series, one end of the first switch component is connected with the third output end of the main control chip, and the other end of the first switch component is connected with the first input end of the main control chip;
the third output end of the main control chip is used for continuously outputting the timing level, and the time length of the first input end of the main control chip continuously receiving the timing level is three-phase non-full-phase action time.
7. The relay protection circuit verification system of claim 2, wherein the transformer polarity verification circuit comprises: the detection circuit comprises a power supply, a detection switch, a first light emitting diode, a second light emitting diode, a first detection end, a second detection end, a third detection end and a fourth detection end;
a first pole of the power supply is connected with the first detection end through the detection switch, and a second pole of the power supply is connected with the second detection end;
the anode of the first light-emitting diode is connected with the third detection end, and the cathode of the first light-emitting diode is connected with the fourth detection end; the anode of the second light-emitting diode is connected with the fourth detection end, and the cathode of the second light-emitting diode is connected with the third detection end;
the first detection end and the second detection end are used for being connected with a first coil of a tested mutual inductor, and the third detection end and the fourth detection end are used for being connected with a second coil of the tested mutual inductor.
8. The relay protection circuit verification system of claim 2, wherein the temperature acquisition verification circuit comprises: the temperature acquisition circuit and the duplex potentiometer are connected;
the first resistance end of the duplex potentiometer is connected with the temperature acquisition circuit in series, and the second resistance end of the duplex potentiometer is used for being connected with the main transformer temperature sampling secondary circuit in series;
the output resistance of the first resistance end and the second resistance end of the duplex potentiometer is the same and can be changed synchronously.
9. The relay protection circuit verification system according to claim 2, wherein the main control chip is provided with an expansion interface for connecting to other relay protection verification circuits.
10. The relay protection circuit verification system according to any one of claims 1 to 9, further comprising a display screen;
the display screen is connected with the output end of the main control chip and used for displaying the checking result.
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