CN114295977B - Monitoring system for non-full-phase opening of circuit breaker and construction method thereof - Google Patents
Monitoring system for non-full-phase opening of circuit breaker and construction method thereof Download PDFInfo
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Abstract
The application relates to the technical field of power equipment monitoring, and discloses a monitoring system for non-full-phase opening of a circuit breaker and a construction method thereof, wherein the method comprises the following steps: for the three-phase equal-opening, one-phase-free opening, two-phase-free opening and three-phase-free opening of the circuit breaker, the circuit breaker bus voltage U and the current passing through A phase
Neutral current
The 4 displays L1, L2, L3 and L4 are respectively connected with the output end F of the logic circuit1、F2、F3、F4And the displays L1, L2, L3 and L4 are displayed through a logic circuit, so that a monitoring system for the incomplete phase opening of the circuit breaker is constructed, and the type of the incomplete phase opening of the circuit breaker is judged. Therefore, the technical problem that the complete and reliable judgment of the opening state of each phase of the 10kV compensating capacitor circuit breaker in the prior art cannot be carried out is solved.
Description
Technical Field
The application relates to the technical field of power equipment monitoring, in particular to a monitoring system for non-full-phase opening of a circuit breaker and a construction method thereof.
Background
The vacuum circuit breaker is widely applied to a 10kV circuit breaker due to small volume, light weight and good arc extinguishing performance, and the vacuum circuit breaker is mainly used as a circuit breaker for cutting off or closing a high-voltage circuit, such as a main transformer low-voltage side, a station transformer, a 10kV outgoing line, a 10kV compensation capacitor bank and the like in a transformer substation. Along with the continuous popularization, the expansion of vacuum circuit breaker, vacuum circuit breaker's various problems also are continuous appearing, especially 10kV compensating capacitor circuit breaker need continuous on and separate every day, some moves up to ten times per day, and mechanical fault's probability is much higher than other circuit breakers, and common trouble mainly has: the prior several fault phenomena can be judged by sound, signal indication, rotation of a motor in the energy storage mechanism, position of a spring and the like in the opening and closing process of the circuit breaker, the problem of the non-full-phase opening fault of the vacuum circuit breaker is complicated due to different voltages and currents of a three-phase loop belt, and a complete and reliable judging method is not available at present.
Disclosure of Invention
The application provides a monitoring system for non-full-phase opening of a circuit breaker and a construction method thereof, which are used for solving the technical problem that complete and reliable judgment cannot be carried out on the opening state of each phase of a 10kV compensation capacitor circuit breaker in the prior art.
In view of the above, a first aspect of the present application provides a monitoring system for non-full-phase opening of a circuit breaker, the system including: the system comprises a voltage relay, a plurality of current relays, a plurality of AND gate modules, a plurality of NOT gate modules and a plurality of displays;
the breaker bus is respectively connected with the first input end of the first AND gate module, the input end of the first NOT gate module, the first input end of the second AND gate module and the first end of the third AND gate module through a voltage relay;
the circuit breaker A is respectively connected with the input end of the second NOT gate module and the third input end of the second AND gate module through a first current relay, and the output end of the second NOT gate module is connected with the second input end of the first AND gate module;
the neutral line N is communicated with the input end of a third NOT gate module and the second end of the third AND gate module through a second current relay respectively, and the output end of the third NOT gate module is connected with the third end of the first AND gate module and the second end of the second AND gate module respectively;
the output end of the first NOT gate module is connected with the first display, the output end of the first AND gate module is connected with the second display, the output end of the third AND gate module is connected with the third display, and the output end of the second AND gate module is connected with the fourth display.
Optionally, when the three phases of the circuit breaker are equally switched off, the first display is normally bright, and the second display, the third display and the fourth display are not bright.
Optionally, when any one of the phases of the circuit breaker is not opened, the second display is normally bright, and the first display, the third display and the fourth display are not bright.
Optionally, when any two phases of the circuit breaker are not opened, the third display is normally on, and the first display, the second display and the fourth display are not on.
Optionally, when none of the three phases of the circuit breaker is opened, the fourth display is normally on, and the first display, the second display and the third display are not on.
The second aspect of the present application provides a method for constructing a monitoring system for non-full-phase opening of a circuit breaker, which is applied to constructing the monitoring system for non-full-phase opening of a circuit breaker according to the first aspect, the method includes:
acquiring an electrical wiring diagram and a phasor diagram of the 10kV compensation capacitor circuit breaker;
according to the electrical wiring diagram and the phasor diagram, respectively carrying out current and voltage analysis on various opening conditions of the circuit breaker and representing the analysis by using logic numerical values, and generating a first logic table of voltage and current under various opening conditions;
simplifying the first logic table according to the distribution rule of the voltage logic value and the current logic value in the first logic table to obtain a second logic table;
and selecting electrical components to construct a non-full-phase opening monitoring system of the circuit breaker according to the distribution rule of the voltage logic value and the current logic value of the second logic table.
Optionally, the various opening conditions include: three phases are equally separated, any one phase is not separated, any two phases are not separated, and three phases are not separated.
Optionally, the electrical component includes: and gate module, NOT gate module, current relay, voltage relay and display.
According to the technical scheme, the method has the following advantages:
the application provides a monitoring system of not full phase separating brake of circuit breaker includes: the breaker bus is respectively connected with the first input end of the first AND gate module, the input end of the first NOT gate module, the first input end of the second AND gate module and the first end of the third AND gate module through a voltage relay; the circuit breaker A is respectively connected with the input end of the second NOT gate module and the third input end of the second AND gate module through a first current relay, and the output end of the second NOT gate module is connected with the second input end of the first AND gate module; the circuit breaker N phase is connected with the input end of a third NOT gate module and the second end of the third AND gate module through a second current relay respectively, and the output end of the third NOT gate module is connected with the third end of the first AND gate module and the second end of the second AND gate module respectively; the output end of the first NOT gate module is connected with the first display, the output end of the first AND gate module is connected with the second display, the output end of the third AND gate module is connected with the third display, and the output end of the second AND gate module is connected with the fourth display.
Compared with the prior art, the monitoring system of this application: 1. the display of various non-full-phase opening of the circuit breaker is realized by utilizing a logic digital circuit, only 2 digital variables (0 and 1) are needed, the circuit is not interfered by other factors, and the circuit is simple and has reliable result; 2. setting a NOT gate and an AND gate according to the logic expression and the digital variable of the voltage and the current, so that the only output end of the corresponding fault type is at a high level, the display displays the fault type, and meanwhile, the output end of the non-fault type is at a low level, and the display does not display the fault type; therefore, the technical problem that the complete and reliable judgment on the opening state of each phase of the 10kV compensating capacitor circuit breaker in the prior art cannot be carried out is solved.
Drawings
Fig. 1 is a schematic circuit diagram of a monitoring system for non-full-phase opening of a circuit breaker according to an embodiment of the present application;
fig. 2 is a schematic flowchart of a method for constructing a monitoring system for non-full-phase opening of a circuit breaker according to an embodiment of the present disclosure;
fig. 3 is an electrical main wiring diagram of a 10kV compensation capacitor circuit breaker provided in an embodiment of the present application;
FIG. 4 is a phasor diagram of three-phase voltages for normal operation of a capacitor provided in an embodiment of the present application;
fig. 5a is a schematic diagram of a Current Transformer (CT) secondary winding connected in series with a current relay, wherein current of A, N phases on the secondary side of the Current Transformer (CT) passes through current relays LA and LN according to an embodiment of the present application;
fig. 5b is a schematic diagram of a contact point of phase a of the current relay provided in the embodiment of the present application;
fig. 5c is a schematic diagram of the N-phase contact of the current relay provided in the embodiment of the present application;
FIG. 6a is a diagram of a slave switch cabinet with a voltage relay U connected in parallel at a live indicator lamp provided in the embodiment of the present applicationJA schematic diagram of (a);
fig. 6b is a schematic diagram of the contacts of the voltage relay provided in the embodiment of the present application;
fig. 7 is a symbolic illustration of a not module provided in an embodiment of the present application;
FIG. 8 is a schematic symbolic diagram of an AND gate module provided in an embodiment of the present application;
fig. 9 is a schematic diagram illustrating that the normally open contact and the normally closed contact of the relay provided in the embodiment of the present application are respectively switched on at a high level and a low level.
Reference numbers: u, breaker bus voltage; I.C. AAThe circuit breaker A phase current; i isNNeutral line N phase current; NOT1, a first NOT gate module; NOT2, a second NOT gate module; NOT3, a third NOT gate module; AND1, a first AND gate block; AND2, a second AND gate block; AND3, a third AND gate block; f1The output end of the first NOT gate module; f2The output end of the first AND gate module; f3The output end of the third AND gate module; f4The output end of the second AND gate module; l1, first display; l2, second display; l3, third display; l4, fourth display.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Interpretation of terms:
high-voltage circuit breaker: the electric equipment can cut off or close the no-load current and the load current in the high-voltage circuit, and cut off the overload current and the short-circuit current through the action of the relay protection device when the system has a fault, has a perfect arc extinguishing structure and enough current breaking capacity, and can be divided into: oil circuit breakers, sulfur hexafluoride circuit breakers, vacuum circuit breakers, etc.
Non-full phase opening: after the breaker is subjected to opening operation, one or more phases in three-phase moving and static contacts cannot be separated due to the fault of the mechanism.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a monitoring system for non-full-phase opening of a circuit breaker according to an embodiment of the present disclosure.
The monitoring system that provides in the embodiment of this application's a non-complete phase separating brake includes:
the breaker bus is respectively connected with a first input end of the first AND gate module AND1, an input end of the first NOT1, a first input end of the second AND gate module AND2 AND a first end of the third AND gate module AND3 through voltage relays;
in fig. 1, U is a breaker bus voltage.
The circuit breaker A is connected with the input end of a second NOT gate module NOT2 AND the third input end of a second AND gate module AND2 through a first current relay respectively, AND the output end of the second NOT gate module NOT2 is connected with the second input end of the first AND gate module AND 1;
in FIG. 1, IAIs breaker a-phase current.
The neutral line N is connected with the input end of a third NOT module NOT3 AND the second end of a third AND module AND3 through a second current relay respectively, AND the output end of the third NOT3 is connected with the third end of the first AND module AND1 AND the second end of the second AND module AND2 respectively;
in FIG. 1, INThe circuit breaker is used for breaking the N-phase current, and the N-phase current is the neutral point current.
Output terminal F of the first not-gate module1An output terminal F of the first AND gate module connected to a first display L12An output F of the third AND gate module connected to a second display L23An output F of the second AND gate module connected to a third display L34Connected to a fourth display L4.
It should be noted that, in this embodiment, 4 displays L1, L2, L3 and L4 are respectively connected to the output terminal F of the logic circuit1、F2、F3、F4And the displays L1, L2, L3 and L4 are displayed through a logic circuit, so that the type of the incomplete phase opening of the breaker is judged.
The logical expression of fig. 1 is:
(1) when the three phases are equally switched off,
，
output is high, and F1Connected corresponding display L1 has a display, F2、F3、F4All are 0, the output is low, and the corresponding displays L2, L3, L4 connected thereto are not shown.
(2) When one phase is not opened, the switching device is controlled,
，
，
，
output is high, and F2Connected corresponding display L2 has a display, F1、F3、F4All are 0, the output is low, and the corresponding displays L1, L3, L4 connected thereto are not shown.
(3) When the two phases are not opened, the switching-off is carried out,
，
，
output is high, and F3Connected corresponding display L3 has a display, F1、F2、F4All are 0, the output is low, and the corresponding displays L1, L2, L4 connected thereto are not shown.
(4) When the three phases are not opened,
，
，
，
output is high, and F4Connected corresponding display L4 has a display, F1、F2、F3All are 0, the output is low, and the corresponding displays L1, L2, L3 connected thereto are not shown.
The logic circuit is used for displaying various non-full-phase opening faults of the circuit breaker, so that the type of the non-full-phase opening is judged, and different processing measures are taken according to different types.
The above is an embodiment of a monitoring system for non-full-phase opening of a circuit breaker provided in the embodiment of the present application, and the following is an embodiment of a method for constructing a monitoring system for non-full-phase opening of a circuit breaker provided in the embodiment of the present application.
Referring to fig. 2 to fig. 9, a method for constructing a monitoring system for non-full-phase opening of a circuit breaker according to an embodiment of the present application is applied to construct the monitoring system for non-full-phase opening of a circuit breaker according to the embodiment, where the method includes:
101, acquiring an electrical wiring diagram and a phasor diagram of a 10kV compensation capacitor circuit breaker;
it should be noted that, in the present embodiment, as shown in fig. 3, through the obtained electrical main connection diagram of the 10kV compensation capacitor circuit breaker, when the capacitor is in normal operation, A, B, C three-phase capacitor and three-phase discharge coil are both in star connection, the neutral point is not grounded, each phase capacitor operates at a voltage between the phase and the neutral point, i.e., a phase voltage, and fig. 4 is a phasor diagram of three-phase voltages.
Wherein the letter definitions in fig. 3 are explained as follows: DS1 is an isolation plug, QF is a breaker, LE1 is a switch cabinet live indicator light, Cab is a cable, DS2 is an isolation disconnecting link DS2, Rea is a reactor, LE2 is a capacitor bank live indicator light, MOA is a lightning arrester, pT is a discharge coil, CAp is a capacitor and a MOA neutral point lightning arrester,Ois a neutral point of the reaction mixture and is,
、
、
the phase A, the phase B and the phase C of the capacitor bank bus are shown.
The letter definitions in fig. 4 are explained as follows: u shapeABLine voltages of A-phase and B-phase, UCALine voltages of C-phase and A-phase, UBCLine voltages for phases B and C.
102, respectively analyzing current and voltage according to the electric wiring diagram and the phasor diagram under various switching-off conditions of the circuit breaker, and representing the analyzed current and voltage by using logic values to generate a first logic table of the voltage and the current under various switching-off conditions;
it should be noted that, as can be seen from the phasor diagram and the wiring diagram:
(1) when the three phases of the circuit breaker are equally switched off, A, B, C three-phase voltages are 0, three-phase currents and neutral line currents are 0, a capacitor bus is not provided with voltage, and a live indicator lamp is not displayed.
(2) When one phase of the circuit breaker is not opened, the phase voltage is applied to other two phases through a neutral point by a discharge coil and a capacitor, and if the AB phase of the circuit breaker is opened, the C phase is not opened, the C phase voltage passes through a C-phase capacitor bank bus, passes through the capacitor and the discharge coil to reach the neutral point, and then is applied to a A, B phase bus by the neutral point through the capacitor and the discharge coil of A, B phases, so that the three-phase bus and the neutral point of the capacitor bank are both provided with the C phase voltage, namely, the voltage between each phase of the capacitor bank and the neutral point is 0, the current flowing through the three-phase bus and the neutral point of the capacitor is both 0, so that the three-phase live indicator lamp displays the C phase voltage.
(3) When the circuit breaker has two phases not being opened, only A, B two phases are supposed to be closed, and the C phase is opened, so that A, B two-phase voltage is applied between A, B two-phase capacitor and the reactor connected in series.
Setting:
then:
namely A, B two phases and neutral point are all provided with voltage, A, B two phases are all provided with current, and neutral point voltage is applied to the C phase through the C phase capacitor and the discharge coil, namely the C phase is equal in potential to the neutral point, so that no current flows through the C phase. Because three-phase current is unbalanced, the neutral conductor has current to pass through, and the condenser three-phase bus all has voltage, and the electrified pilot lamp of three-phase shows to have the electricity.
Wherein,
is the A-phase voltage phasor,
Is the phasor of the phase B voltage,
Is a neutral point voltage phasor,
Phase A and neutral point phasor,
Phase B and neutral point phasor.
(4) When the three phases of the circuit breaker are not opened, A, B, C voltage is applied to the capacitor bank bus, the neutral point voltage is 0, and each phase and the neutral point voltage are phase voltages, namely
、
、
A, B, C three phases all have current passing through, and the phase difference is 120 because of the balance of the three phasesoAnd no current passes through the neutral line, the capacitor buses have voltage, and the three-phase live indicating lamp displays electricity.
Based on the above analysis, the voltage and current values of the three-phase circuit breaker in various opening states are represented by logic values, 1 represents voltage or current, and 0 represents no voltage or current, and the results are shown in table 1 (first logic table).
Table 1: voltage and current logic value of breaker under various opening conditions
Wherein,
is the bus voltage of the capacitor bank,
、
、
、
a, B, C, neutral point current, respectively.
it should be noted that, as can be seen from Table 1, only extraction is required
、
、
The three parameters are combined to judge the opening and closing state of the three-phase circuit breaker, and when the three parameters are combined, the three-phase circuit breaker is in the opening and closing state
、
、
When all are 0, the three phases are equally separated
The number of the carbon atoms is 1,
、
when 0, one of the three phases is not opened. When in use
The number of the carbon atoms is 1,
when 1, two of the three phases are not opened, when
Is 1.
The number of the carbon atoms is 1,
when 0, three phases are not opened. The simplified logical values of the voltage and the current are shown in table 2 (second logic table).
Table 2: simplified voltage and current logic values
Wherein (1) whether the phase A has current or not, if the neutral line has current, it can be determined that the two phases have no opening. (2) When the three phases are not opened, the current of the three phases flows, and the phase difference of the three phases is 120oNeutral current
。
And 104, selecting electrical components to construct a non-full-phase opening monitoring system of the circuit breaker according to the distribution rule of the voltage logic value and the current logic value of the second logic table.
The selection process for the electrical components is described as follows:
(1) current of A, N phases from the secondary side of the Current Transformer (CT) of the circuit breaker passes through the current relays LA and LN, as shown in fig. 5a, the a-phase contact of the relay is shown in fig. 5b, and the N-phase contact of the relay is shown in fig. 5c, when the current relay has no current, its normally closed contact is on, i.e. 1 and2 are on, and when the current relay has current, its normally open contact is on, i.e. 1 and3 are on.
(2) The electrified indicating lamp of the slave switch cabinet is connected with a voltage relay U in parallelJAs shown in FIG. 6a, C1、C2And C3All the capacitors are capacitors, the contacts of the voltage relay are as shown in fig. 6b, when there is no voltage across the voltage relay, the normally closed contacts are turned on, i.e. 1 and2 are turned on, and when there is voltage across the voltage relay, the normally open contacts are turned on, i.e. 1 and3 are turned on.
(3) The input end of the logic digital circuit is connected with normally open and normally closed contacts of a current relay or a voltage relay, and the normally open and normally closed contacts are respectively connected with a high level (+ 5V) and a low level (grounding), so that the output end of the logic digital circuit is connected to displays corresponding to three-phase equal-opening brake, one-phase-free opening brake, two-phase-free opening brake and three-phase-free opening brake.
a. The sign of the not gate is shown in fig. 7, and the logic expression is as follows:
the truth table is shown in table 3:
table 3: not gate truth table
When the input end is connectedXIs low (0), the output terminal F is high (1), when the input terminal is atXIs high (1) and the output terminal F is low (0).
b. The sign of the AND gate is shown in FIG. 8, and the truth table is shown in Table 4:
logic expression:
the truth table is shown in table 4:
table 4: and gate truth table
When the input end is connectedX、YThe output terminal F is all low level as long as one terminal is low level, and only when the input terminal is low levelX、YSimilarly, for an and logic circuit having three or more input terminals, only all the input terminals are at high level, and the input terminals are at high level, otherwise, the output terminals F are at low level as long as one of the input terminals is at low level.
c. The normally open and normally closed contacts of the current relay or voltage relay are turned on at high level (+ 5V) and low level (ground), respectively, as shown in fig. 9.
According to the three-phase equal-opening, one-phase non-opening, two-phase non-opening and three-phase non-opening circuit breaker bus voltage U and A-phase passing current
Neutral current
The 4 displays L1, L2, L3 and L4 are respectively connected with the output end F of the logic circuit1、F2、F3、F4And the displays L1, L2, L3 and L4 are realized through a logic circuit, so that the type of the incomplete phase opening of the breaker is judged, and the constructed monitoring system is shown in FIG. 1.
The terms "first," "second," "third," "fourth," and the like in the description of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (8)
1. A monitoring system for non-full-phase opening of a circuit breaker is characterized by comprising: the system comprises a voltage relay, a plurality of current relays, a plurality of AND gate modules, a plurality of NOT gate modules and a plurality of displays;
the breaker bus is respectively connected with the first input end of the first AND gate module, the input end of the first NOT gate module, the first input end of the second AND gate module and the first input end of the third AND gate module through a voltage relay;
the circuit breaker A is respectively connected with the input end of the second NOT gate module and the third input end of the second AND gate module through a first current relay, and the output end of the second NOT gate module is connected with the second input end of the first AND gate module;
the neutral line N is connected with the input end of a third NOT gate module and the second input end of the third AND gate module through a second current relay, and the output end of the third NOT gate module is connected with the third input end of the first AND gate module and the second input end of the second AND gate module;
the output end of the first NOT gate module is connected with the first display, the output end of the first AND gate module is connected with the second display, the output end of the third AND gate module is connected with the third display, and the output end of the second AND gate module is connected with the fourth display.
2. The monitoring system for the non-full-phase opening of the circuit breaker according to claim 1,
when the three phases of the circuit breaker are switched off uniformly, the first display is normally bright and displays, and the second display, the third display and the fourth display are not bright.
3. The system for monitoring the non-full-phase opening of the circuit breaker according to claim 2, wherein when any one phase of the circuit breaker is not opened, the second display is normally on, and the first display, the third display and the fourth display are not on.
4. The system for monitoring the non-full-phase opening of the circuit breaker according to claim 3, wherein when any two phases of the circuit breaker are not opened, the third display is normally on, and the first display, the second display and the fourth display are not on.
5. The monitoring system for the non-full-phase opening of the circuit breaker according to claim 4,
when the three phases of the circuit breaker are not switched off, the fourth display is normally bright, and the first display, the second display and the third display are not bright.
6. A method for constructing a monitoring system for non-full-phase opening of a circuit breaker, which is applied to the construction of the monitoring system for non-full-phase opening of the circuit breaker according to any one of claims 1 to 5, and is characterized by comprising the following steps:
acquiring an electrical wiring diagram and a phasor diagram of the 10kV compensation capacitor circuit breaker;
according to the electrical wiring diagram and the phasor diagram, respectively carrying out current and voltage analysis on various opening conditions of the circuit breaker and representing the analysis by using logic numerical values, and generating a first logic table of voltage and current under various opening conditions;
simplifying the first logic table according to the distribution rule of the voltage logic value and the current logic value in the first logic table to obtain a second logic table;
and selecting electrical components to construct a non-full-phase opening monitoring system of the circuit breaker according to the distribution rule of the voltage logic value and the current logic value of the second logic table.
7. The method for constructing the monitoring system for the non-full-phase opening of the circuit breaker according to claim 6, wherein the various opening conditions comprise: three phases are equally separated, any one phase is not separated, any two phases are not separated, and three phases are not separated.
8. The method for constructing the monitoring system for the non-full-phase opening of the circuit breaker according to claim 6, wherein the electrical components comprise: and gate module, NOT gate module, current relay, voltage relay and display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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