CN109375095B - Signal machine monitoring system - Google Patents
Signal machine monitoring system Download PDFInfo
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- CN109375095B CN109375095B CN201810995146.2A CN201810995146A CN109375095B CN 109375095 B CN109375095 B CN 109375095B CN 201810995146 A CN201810995146 A CN 201810995146A CN 109375095 B CN109375095 B CN 109375095B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/44—Testing lamps
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
Abstract
The invention provides a signal machine monitoring system which comprises a power supply anode, a first power electronic switch, a signal machine, a second power electronic switch and a power supply cathode which are sequentially connected in series; a first monitoring circuit is arranged between the first power electronic switch and the signal machine; a second monitoring circuit is arranged between the second power electronic switch and the signal machine; the first monitoring circuit includes: a first current sensor, a first relay, a first switching relay, and a first voltage dividing circuit; the second monitoring circuit includes: the relay includes a second current sensor, a second relay, a second switching relay, and a second voltage dividing circuit. The invention realizes the design of control and monitoring integration and simplifies the circuit structure.
Description
Technical Field
The invention relates to the technical field of rail transit, in particular to a signal machine monitoring system.
Background
In the rail transit, the control of the signal machine is controlled by an interlocking system and is monitored by a microcomputer monitoring device. The full-electronic computer interlocking is an interlocking realized based on a power electronic switching device, and is different from an interlocking system with a relay as a switching device. The power electronic devices include solid state relays, IGBTs, thyristors, etc.
A computer interlock system is a safety system that requires a safety rating of SIL-4. According to IEC 61508 "functional safety of electrical/electronic/programmable electronic safety systems", self-checking of critical devices is required during operation to ensure device availability, and safety is guided when critical devices fail. In an interlock system using a relay as a switching device, a safety relay having a forcibly guided contact is used, and by detecting the state of any one of the contacts, it is possible to know whether the other contacts are open or closed. But for power electronic switching devices there is no such forced steering mechanism. In the semaphore control of an all-electronic computer interlock system, a typical way to detect a power electronic switching device is shown in fig. 1. In fig. 1, two power electronic switches respectively control the positive and negative poles of the traffic signal power supply, and when both switches are closed simultaneously, the traffic signal is lit, and when either of them is off, the traffic signal is extinguished.
The main mechanism of the test scheme for the power electronic switch is to establish two independent loops passing through the same power electronic switch, wherein one loop is a control loop and the other loop is a detection loop. The detection loop consists of an isolation test excitation, a power electronic switch and a detection circuit. When the isolation test excitation and detection circuit works normally, the isolation test excitation and detection circuit does not work, and the control loop can normally control the annunciator. When the power electronic switches are detected, only one power electronic switch is turned on, and then the isolation test excitation sends out an excitation signal so as to detect whether the circuit receives a correct excitation signal and judge whether the power electronic switches are normally turned on or off.
The main defects of the scheme are that the devices are multiple, the circuit is complex, each power electronic device needs an independent isolated test excitation and detection circuit, and the detection circuit is not influenced by the control circuit and is not influenced. In addition, in the existing full-electronic computer interlocking, the control and detection integration is generally realized, and the requirement on a microcomputer detection system is reduced. However, the current scheme has the defects that the microcomputer monitoring system is only miniaturized and is realized on a PCB, and the scale of a circuit is not effectively reduced. In addition, the current detection means basically provides only current data, and the data types are few.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a signal machine monitoring system.
Specifically, the invention provides the following technical scheme:
the invention provides a signal machine monitoring system which comprises a power supply anode, a first power electronic switch, a signal machine, a second power electronic switch and a power supply cathode which are sequentially connected in series;
wherein a first monitoring circuit is arranged between the first power electronic switch and the signal machine; a second monitoring circuit is arranged between the second power electronic switch and the signal machine;
the first monitoring circuit includes: a first current sensor, a first relay, a first switching relay, and a first voltage dividing circuit;
a first end of the first current sensor is connected with the first power electronic switch, and a second end of the first current sensor is connected with a first node;
one end of the first relay is connected with the first node, and the other end of the first relay is connected with the second node;
the normally closed contact of the first switching type relay is connected with a first node, the normally open contact of the first switching type relay is connected with a second node, and the common end of the first switching type relay is connected with a first voltage division circuit in series and then connected with the ground;
the second monitoring circuit includes: the second current sensor, the second relay, the second switching type relay and the second voltage division circuit;
a first end of the second current sensor is connected with the second power electronic switch, and a second end of the second current sensor is connected with a third node;
one end of the second relay is connected with the third node, and the other end of the second relay is connected with the fourth node;
and a normally closed contact of the second switching relay is connected with a third node, a normally open contact of the second switching relay is connected with a fourth node, and a common end of the second switching relay is connected with a second voltage division circuit in series and then connected with the ground.
Further, the first voltage division circuit comprises two or more resistors connected in series; the second voltage division circuit comprises two or more resistors connected in series.
Further, the system further comprises: an electric energy metering module;
the electric energy metering module is connected with the first current sensor, the second current sensor, the first voltage division circuit and the second voltage division circuit, and is used for receiving and displaying the currents acquired by the first current sensor and the second current sensor, and calculating the voltage division information on the first voltage division circuit and the second voltage division circuit.
Further, the electric energy metering module is also used for further calculating active power and reactive power according to the received current and the calculated partial pressure information.
Further, the first current sensor and the second current sensor are any one of a current transformer, a rogowski coil, a sampling resistor and a hall sensor.
According to the technical scheme, the signal machine monitoring system comprises a power supply anode, a first power electronic switch, a signal machine, a second power electronic switch and a power supply cathode which are sequentially connected in series; a first monitoring circuit is arranged between the first power electronic switch and the signal machine; a second monitoring circuit is arranged between the second power electronic switch and the signal machine; the first monitoring circuit includes: a first current sensor, a first relay, a first switching relay, and a first voltage dividing circuit; a first end of the first current sensor is connected with the first power electronic switch, and a second end of the first current sensor is connected with a first node; one end of the first relay is connected with the first node, and the other end of the first relay is connected with the second node; the normally closed contact of the first switching type relay is connected with a first node, the normally open contact of the first switching type relay is connected with a second node, and the common end of the first switching type relay is connected with a first voltage division circuit in series and then connected with the ground; the second monitoring circuit includes: the second current sensor, the second relay, the second switching type relay and the second voltage division circuit; a first end of the second current sensor is connected with the second power electronic switch, and a second end of the second current sensor is connected with a third node; one end of the second relay is connected with the third node, and the other end of the second relay is connected with the fourth node; and a normally closed contact of the second switching relay is connected with a third node, a normally open contact of the second switching relay is connected with a fourth node, and a common end of the second switching relay is connected with a second voltage division circuit in series and then connected with the ground. The annunciator monitoring system provided by the invention realizes the design of control and monitoring integration, and simplifies the circuit structure compared with the prior art.
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 introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art circuit for detection of power electronic switching devices;
fig. 2 is a schematic structural diagram of a traffic signal monitoring system according to an embodiment of the present invention;
fig. 3 is another schematic structural diagram of a signal monitoring system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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 invention.
An embodiment of the present invention provides a signal monitoring system, which is shown in fig. 2, and includes a power supply positive electrode (110V ac positive), a first power electronic switch, a signal, a second power electronic switch, and a power supply negative electrode (110V ac negative) connected in series in sequence;
wherein a first monitoring circuit is arranged between the first power electronic switch and the signal machine; a second monitoring circuit is arranged between the second power electronic switch and the signal machine;
the first monitoring circuit includes: a first current sensor T1, a first relay S3, a first switching relay S1, and a first voltage dividing circuit; a first terminal of the first current sensor T1 is connected to the first power electronic switch and a second terminal of the first current sensor T1 is connected to a first node; one end of the first relay S3 is connected with a first node, and the other end of the first relay S3 is connected with a second node; a normally closed contact of the first switching relay S1 is connected with a first node, a normally open contact of the first switching relay S1 is connected with a second node, and a common end of the first switching relay S1 is connected with a first voltage division circuit in series and then is connected with the ground;
the second monitoring circuit includes: a second current sensor T2, a second relay S4, a second switching relay S2, and a second voltage dividing circuit; a first terminal of the second current sensor T2 is connected to the second power electronic switch, and a second terminal of the second current sensor T2 is connected to a third node; one end of the second relay S4 is connected with the third node, and the other end of the second relay S4 is connected with the fourth node; a normally closed contact of the second switching relay S2 is connected with a third node, a normally open contact of the second switching relay S2 is connected with a fourth node, and a common end of the second switching relay S2 is connected with a second voltage division circuit in series and then connected with the ground.
It should be noted that the first current sensor and the second current sensor may be a current transformer, a rogowski coil, a sampling resistor, a hall sensor, or other sensors to realize current sampling. In addition, the voltage divider circuit is designed for convenience of voltage sampling.
It should be noted that the signal monitoring system provided in this embodiment includes two operating states: and (5) controlling and detecting. The control means to control lighting and extinguishing of the traffic signal. The detection refers to the detection of power electronic switches, signal machine filaments, cable mixed wires and the like. Specifically, when S3, S4 are closed, the contacts of S1 and S2 are shorted, and the system is in the control state. When S3, S4 is off, the system is in a detection state. In the detection state, two functions of control and monitoring are shared according to different switching states of S1 and S2. For example, the contacts of the two relays S3 and S4 are opened, the switches S1 and S2 are switched to the control function (as shown in fig. 2, that is, the switch blades of S1 and S2 are switched to the normally closed contacts), and a power electronic switch (such as a first power electronic switch) is closed, at this time, the voltage value on the first voltage dividing circuit and the current value in the circuit are read, and if the voltage value is 110V effective value and the current value is 0 (the first power electronic switch is closed, the safety switch is located in the control function, the integrity of the power electronic switch is monitored, and the resistance value of the circuit composed of the first power electronic switch and the first voltage dividing circuit is large, the current is small and is approximate to 0 ]), it is determined that the first power electronic switch is effectively closed and the operation is normal; and (3) turning off the first power electronic switch, wherein the voltage value and the current value are both 0 (after the first power electronic switch is turned off, no loop is established, and therefore, the voltage and the current are both 0), which indicates that the first power electronic switch is effectively turned off and works normally. In addition, all the power electronic switches can be closed at one time, and the detection of all the power electronic switches can be realized by executing the process.
As can be seen from the above, the annunciator monitoring system provided in this embodiment realizes the integrated design of control and monitoring through the special circuit design and the cooperation of the relay and the switching relay, and compared with the manner that two circuits, namely a control circuit and a detection circuit, need to be separately set in the prior art, this embodiment obviously simplifies the circuit, and realizes multiple functions of one circuit.
Based on the above, in an alternative implementation manner of this embodiment, referring to fig. 3, the first voltage dividing circuit includes two or more resistors connected in series; the second voltage division circuit comprises two or more resistors connected in series.
Based on the above, in an optional implementation manner of this embodiment, referring to fig. 2, the system further includes: an electric energy metering module;
the electric energy metering module is connected with the first current sensor, the second current sensor, the first voltage division circuit and the second voltage division circuit, and is used for receiving and displaying the currents acquired by the first current sensor and the second current sensor, and calculating the voltage division information on the first voltage division circuit and the second voltage division circuit.
It can be understood that, when the electric energy metering module calculates the voltage division information on the first voltage division circuit and the second voltage division circuit, the voltage information sampling may be performed according to the idea that the voltage division is proportional to the resistance value of the resistor.
Based on the above, in an optional implementation manner of this embodiment, the electric energy metering module is further configured to calculate active power and reactive power according to the received current information and the calculated voltage division information.
In fig. 2 and 3, S1 and S2 are two FORM-C switching safety relays, and implement switching between a system control state and a detection state. The control state refers to turning on and off of the control signal. The detection state mainly detects whether power electronic switch is effective, whether the filament of look lamp semaphore takes place disconnected silk, whether integrality of the inside transformer of LED semaphore to and whether many lamp position semaphores cause the mixed line because the cable is damaged, opens circuit etc.. S3 and S4 are safety relays for controlling the on/off of the traffic signal. The T1 and T2 are current sensors, which can be current transformers, Rogowski coils, sampling resistors or Hall sensors, etc., and realize current sampling, and the sampled signals are processed and then input into the electric energy metering module. R1, R2, R3, R4 are resistors. R1 and R2, R3 and R4 constitute two voltage division circuits, realize the sampling to the voltage signal, the signal sampled is input to the electric energy metering module after processing. The electric energy metering module can realize the metering function of electric energy/electric parameters and mainly realizes the measurement of parameters such as voltage, current, active power, reactive power and the like. There are many single-chip power metering solutions on the market. For example, CS5480 of Cirrus logic, ADE9152 of ADI, and the like, these chips, voltage sampling circuit, and current sampling circuit constitute an electric energy metering circuit, and output voltage, current, active power, reactive power, and the like through a communication bus, and the circuit is simple and low in cost. It should be noted that fig. 2 and 3 also show some circuits that may be needed, such as signal processing, analog signal conversion, communication bus, processor, etc., which are not shown in the block diagram.
The following specifically describes the working principle of the traffic signal monitoring system provided in this embodiment:
the signal machine monitoring system provided by the embodiment comprises two working states: and (5) controlling and detecting. The control means to control lighting and extinguishing of the traffic signal. The detection refers to the situation that a power electronic switch, a signal machine filament, a cable mixed wire and the like are detected, the power electronic switch is enabled, the signal machine is ensured not to be broken by a red light or a circuit is broken, and the signal machine cannot be lightened, or other lamp positions are lightened by errors caused by the cable mixed wire. The following provides a specific working process of the traffic signal monitoring system provided in this embodiment:
A. and (3) control state:
a. controlling the signal machine to light:
firstly, closing relays S3 and S4, wherein contacts of S1 and S2 are short-circuited, switching does not occur, and a metering circuit composed of T1, R1, R2, T2, R3, R4 and an electric energy metering module can measure various parameters of a control circuit at any time; then, the two power electronic switches are closed, so that all the switches are closed, and the signal machine can be lightened; the electric energy metering module outputs various electric parameters, and the integration of control and monitoring is realized.
b. Controlling the signal to extinguish:
firstly, two power electronic switches are disconnected, so that if the power electronic switches work normally, a signal machine is extinguished, the current measured by a metering circuit is 0, the voltage is 0, and the parameter output by an electric energy metering module is also 0; the relays S3, S4 are then opened; s1 and S2 are switched to the detection function.
B. And (3) detecting the state:
a. detection of the power electronic switch:
the method comprises the steps of opening contacts of two relays S3 and S4, switching knives of S1 and S2 to a control function (as shown in FIG. 2, namely switching knives of S1 and S2 are switched to normally closed contacts), closing a power electronic switch (such as a first power electronic switch), reading a voltage value and a current value through an electric energy metering module, and if the voltage value is 110V effective value and the current value is 0, indicating that the power electronic switch is effectively closed and works normally; the opened power electronic switch is disconnected, and the voltage value and the current value output by the electric energy metering module are both 0, so that the power electronic switch is effectively disconnected and works normally; all the power electronic switches are closed at one time, and the process is executed, so that all the power electronic switches can be detected.
b. Mixed line detection
The contacts of the S3 and the S4 relays are disconnected, the switching knives of the S1 and the S2 are switched to the detection function (namely the switching knives of the S1 and the S2 are switched to the normally open contacts), the relay S3 and the first power electronic switch are sequentially opened, then the voltage values of all the electric energy metering modules are sequentially detected, and if voltage values are output from other electric energy metering modules, the occurrence of mixed lines is indicated.
It can be seen that this embodiment has designed a monitoring system, and this monitoring system has realized the switching of control state and detection state through the combination of two relays to make in the control of semaphore, realize the detection of key device, this embodiment has simplified the circuit, has reduced the quantity of components and parts, and provide more monitoring data, such as voltage, active power, reactive power, data such as current-voltage phase difference, carry out the analysis based on these data, can realize semaphore fault monitoring, functions such as location.
As can be seen from the above, the annunciator monitoring system provided in this embodiment realizes the integrated design of control and monitoring through the special circuit design and the cooperation of the relay and the switching relay, and compared with the manner that two circuits, namely a control circuit and a detection circuit, need to be separately set in the prior art, this embodiment obviously simplifies the circuit, and realizes multiple functions of one circuit.
The above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will 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 of the embodiments of the present invention.
Claims (5)
1. A signal machine monitoring system is characterized by comprising a power supply anode, a first power electronic switch, a signal machine, a second power electronic switch and a power supply cathode which are sequentially connected in series;
wherein a first monitoring circuit is arranged between the first power electronic switch and the signal machine; a second monitoring circuit is arranged between the second power electronic switch and the signal machine;
the first monitoring circuit includes: a first current sensor, a first relay, a first switching relay, and a first voltage dividing circuit;
a first end of the first current sensor is connected with the first power electronic switch, and a second end of the first current sensor is connected with a first node;
one end of the first relay is connected with the first node, and the other end of the first relay is connected with the second node;
the normally closed contact of the first switching type relay is connected with a first node, the normally open contact of the first switching type relay is connected with a second node, and the common end of the first switching type relay is connected with a first voltage division circuit in series and then connected with the ground;
the second monitoring circuit includes: the second current sensor, the second relay, the second switching type relay and the second voltage division circuit;
a first end of the second current sensor is connected with the second power electronic switch, and a second end of the second current sensor is connected with a third node;
one end of the second relay is connected with the third node, and the other end of the second relay is connected with the fourth node;
and a normally closed contact of the second switching relay is connected with a third node, a normally open contact of the second switching relay is connected with a fourth node, and a common end of the second switching relay is connected with a second voltage division circuit in series and then connected with the ground.
2. The system of claim 1, wherein the first voltage divider circuit comprises two or more resistors connected in series; the second voltage division circuit comprises two or more resistors connected in series.
3. The system of claim 2, further comprising: an electric energy metering module;
the electric energy metering module is connected with the first current sensor, the second current sensor, the first voltage division circuit and the second voltage division circuit, and is used for receiving and displaying the currents acquired by the first current sensor and the second current sensor, and calculating the voltage division information on the first voltage division circuit and the second voltage division circuit.
4. The system of claim 3, wherein the power metering module is further configured to further calculate active power and reactive power based on the received current and the calculated voltage division information.
5. The system of claim 1, wherein the first current sensor and the second current sensor are any one of a current transformer, a rogowski coil, a sampling resistor, and a hall sensor.
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| CN201810995146.2A CN109375095B (en) | 2018-08-29 | 2018-08-29 | Signal machine monitoring system |
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| CN201810995146.2A CN109375095B (en) | 2018-08-29 | 2018-08-29 | Signal machine monitoring system |
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| CN109375095B true CN109375095B (en) | 2020-09-25 |
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