CN117712987A - Protection device and method for high-voltage breaking test control loop relay - Google Patents
Protection device and method for high-voltage breaking test control loop relay Download PDFInfo
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Abstract
The invention discloses a protection device and a method for a high-voltage breaking test control loop relay, comprising an overvoltage protection module, an on-site alarm module and a remote alarm module, wherein the high-voltage breaking test control loop comprises a protected relay, a switching-on/switching-off coil and a control loop power supply which are sequentially connected in series, and the overvoltage protection module adopts a self-recovery fuse and a piezoresistor to carry out overvoltage protection on the protected relay of the high-voltage breaking test control loop; the on-site alarm module detects overvoltage signals and alarms on site when overvoltage signals are detected; and the remote alarm module carries out remote alarm on the overvoltage signal detected by the local alarm module. The invention can protect the safety of the relay in the high-voltage breaking test process, and can carry out overvoltage alarm in the local and remote places, thereby helping operation and maintenance personnel to master the state of the control system and being beneficial to timely taking countermeasures.
Description
Technical Field
The invention belongs to the technical field of relay protection, and relates to a protection device and method for a high-voltage breaking test control loop relay.
Background
The high-voltage circuit breaker and the fuse are used as important equipment necessary for controlling and protecting a power system, and the important functions of throwing and cutting off of a high-voltage load, on-off control of no-load or load current, correct treatment of short circuit or overload faults, poor matching of upper-stage and lower-stage circuit breakers and the like are realized by the sufficient breaking capacity, the reliable arc extinguishing capacity and the accurate execution capacity of instructions.
In order to check the product performance of the high-voltage circuit breaker and the fuse and check the actual operation performance of the high-voltage circuit breaker and the fuse in the power system, a series of tests are required to be carried out according to related standards. The high-voltage breaking test has extremely high requirements on test equipment, system construction, device arrangement, flow control, personnel arrangement and safety measures, and is an important point and difficulty in high-voltage circuit breaker and fuse type tests.
In order to ensure the accuracy, objectivity and authority of the high-voltage breaking test, forming the voltage and current which are the same as or equivalent to the reference system where the high-voltage breaker and the fuse are located is the basic premise of the high-voltage breaking test. This means that the voltage level in the test loop is high, and the overvoltage generated in the switching-on process of the test loop is extremely easy to generate electromagnetic interference to the secondary loop through space coupling, so that the functions of measurement, control and the like are affected, and meanwhile, the relay is damaged.
In addition, the switching-on circuit breaker used for the high-voltage switching-off test is more in test times, so that compared with the circuit breaker in a power system, the internal element is more worn and aged, and is more prone to being in an abnormal state or to being in failure. When the auxiliary switch of the closing breaker is aged and is not closed or opened in place, in order to ensure that the closing and opening coils are not burnt out due to long-time through current, the control loop needs to be separated by the relay according to set time, and overvoltage which is higher than bearable by the relay is formed in the opening process of the relay, so that the relay is damaged.
The relay is used as an electric control device and is a key ring for controlling the switching-on breaker to break at a designated moment in the high-voltage switching-off test process, realizing phase selection switching-on and forming a required test waveform. The test is fragile, and if the control loop breaks down and fails due to coupling overvoltage or breaking, the test is delayed, so that potential safety hazards are formed.
At present, the protection scheme of the control relay aiming at the high-voltage breaking test is mainly a freewheeling diode and resistance-capacitance voltage division method. The diode is connected in parallel in the control loop, and is normally in a cut-off state, when the relay cuts off the control loop to generate reverse overvoltage, the overvoltage is conducted and eliminated, but the forward coupling overvoltage cannot be eliminated, and the defects of relatively high price, burnout of polarity connection caused by fault and the like exist. The latter is a resistor and a capacitor connected in parallel or in series in the control loop, and has simple structure but insignificant overvoltage limiting effect. Therefore, a protection device for a high-voltage breaking test control relay needs to be designed, damage to the high-voltage breaking test due to overvoltage possibly generated by a test system where the high-voltage breaking test is located is avoided, and safe and orderly performance of the high-voltage breaking test is ensured.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a protection device and a protection method for a high-voltage breaking test control loop relay.
The invention adopts the following technical scheme.
The protection device for the high-voltage breaking test control loop relay comprises an overvoltage protection module and an alarm module, wherein the high-voltage breaking test control loop comprises a protected relay, a switching-on/switching-off coil and a control loop power supply which are sequentially connected in series, and the control loop power supply supplies power to the high-voltage breaking test control loop;
the overvoltage protection module adopts a self-recovery fuse and a piezoresistor to carry out overvoltage protection on a protected relay of a high-voltage breaking test control loop;
and the alarm module is used for detecting an overvoltage signal and giving an overvoltage alarm.
Preferably, the self-restoring fuse is connected in series between the protected relay and the control loop power supply;
the piezoresistor is connected with the branch circuit where the switch-on/switch-off coil of the protected relay is located in parallel.
Preferably, the alarm module comprises an in-situ alarm module and a remote alarm module;
the on-site alarm module detects overvoltage signals and gives an on-site overvoltage alarm;
and the remote alarm module carries out remote alarm on the overvoltage signal detected by the local alarm module.
Preferably, the on-site alarm module comprises an overvoltage monitoring module, a direct-current power supply, a trigger contactor, a buzzer, an alarm lamp, a reset button and a conduction contactor;
the overvoltage monitoring module is connected in parallel with a branch circuit where the protected relay and the on/off gate coil are positioned;
the buzzer, the alarm lamp and the reset button are connected in parallel and are connected with the overvoltage monitoring module through the trigger contactor;
the conducting contactor is connected with the triggering contactor in parallel, and both the conducting contactor and the triggering contactor are normally open contactors;
the overvoltage monitoring module provides a trigger signal for the trigger contactor;
the reset button is a normally closed switch and provides a conduction signal for the conduction contactor;
the direct current power supply supplies power to the overvoltage monitoring module, the buzzer and the alarm lamp.
Preferably, the overvoltage detected by the overvoltage monitoring module is converted into an analog signal in an equal ratio mode, and the analog signal is transmitted to the remote alarm module.
Preferably, the overvoltage monitoring module comprises a voltage detection unit, a voltage comparison unit, a switch signal unit and an analog signal unit;
the voltage detection unit is connected in parallel with the branch where the on/off coil of the protected relay is located and is used for measuring the voltage V of the branch in ；
The voltage comparison unit is used for judging the overvoltage when the voltage V in Greater than or equal to threshold voltage V SET When in use, the switch signal unit sends trigger signal with set duration to the trigger contactor, and the analog signal unit carries out modeling to the remote alarm moduleAnd (5) transmission of the analog signal.
Preferably, the trigger signal is a direct current voltage of +5v;
the analog signal is A OUT ＝0.5+0.0125*V in The unit is V.
Preferably, the remote alarm module comprises a programmable logic controller and an upper computer;
the programmable logic controller acquires an analog signal sent by the overvoltage monitoring module through the upper computer communication unit, restores the signal and displays the restored signal in the upper computer.
Preferably, the programmable logic controller comprises an analog quantity acquisition unit and a calculation unit;
the analog quantity acquisition unit receives an analog signal A OUT And transmitting to a computing unit, and outputting V after the computing unit reversely pushes in ＝(A OUT -0.5)/0.0125。
A protection method for a high voltage on-off test control loop relay, comprising:
the high-voltage breaking test control loop works normally;
when the overvoltage protection module generates overvoltage when the primary voltage is coupled into the secondary circuit or the test control circuit is disconnected, the self-recovery fuse and the piezoresistor are adopted to carry out overvoltage protection on the protected relay;
and triggering an alarm after the alarm module detects the overvoltage.
Preferably, the normal working process of the high-voltage breaking test control loop is as follows:
the initial state of the protected relay is off, the loop is not conducted, the on/off coil is not electrified, the corresponding switching-on circuit breaker does not act, and when the protected relay receives a conduction signal for a set duration, the control loop is conducted in the duration, the on/off coil is electrified, and the corresponding switching-on circuit breaker acts.
Preferably, when the overvoltage protection module generates overvoltage when the primary voltage is coupled into the secondary circuit or the test control circuit is disconnected, the overvoltage protection process of the protected relay by adopting the self-recovery fuse and the piezoresistor is as follows:
when the primary voltage is coupled into the secondary circuit or the breaking test control circuit to generate overvoltage, the overvoltage protection module short-circuits a branch formed by the protected relay and the on/off coil through the low-resistance state of the piezoresistor, the overvoltage acts on the piezoresistor to generate heavy current, and then the high-resistance state of the self-recovery fuse is triggered to break the control circuit, so that the protected relay is prevented from being damaged by overvoltage and overcurrent, and after the overvoltage disappears, the self-recovery fuse and the piezoresistor return to the low-resistance state and the high-resistance state respectively, and the control circuit returns to the normal working state.
Preferably, the alarm module triggers an on-site alarm after detecting the overvoltage, and the specific process is as follows:
the alarm module sends a trigger signal with a set duration to the trigger contactor after the overvoltage monitoring module detects overvoltage, the trigger contactor receives the trigger signal and then is attracted, so that the buzzer, the alarm lamp and the reset button are powered on, the buzzer sends out warning sound, the alarm lamp sends out light, a branch where the reset button is located provides a conducting signal to the conducting contactor, the conducting contactor receives the conducting signal and then continues to attract, and even if the trigger signal stops sending, the buzzer and the alarm lamp are still in a working state until the reset button is pressed down to release on-site alarm.
Preferably, the alarm module carries out remote alarm on the detected overvoltage signal, and the specific process is as follows:
the alarm module converts the voltage to analog after the overvoltage monitoring module detects overvoltage, and the analog is transmitted to the programmable logic controller, and the programmable logic controller restores the signal and displays the restored signal in the upper computer.
A terminal comprising a processor and a storage medium; the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method.
A computer readable storage medium having stored thereon a computer program which when executed by a processor realizes the steps of the method.
The invention has the beneficial effects that compared with the prior art:
the invention uses the piezoresistor and the self-recovery fuse in a matched way, so that the relay is protected from the coupling of the primary circuit and the secondary circuit in the high-voltage breaking test process or the damage of overvoltage generated when the relay breaks a control circuit, the safety of the relay in the high-voltage breaking test process is protected, the protection cost is reduced, and the circuit safety and the overvoltage limiting effect are improved.
The invention sends out alarm signals on site and remotely through the cooperation of the overvoltage detection module, the buzzer, the alarm lamp, the upper computer communication and the like, thereby helping operation and maintenance personnel to master the state of the control system and being beneficial to timely taking countermeasures. Meanwhile, the invention considers the conversion mode between the digital signal and the analog signal, reasonably converts the digital signal and the analog signal, converts the detected voltage signal (1-600V) into the signal (0-8V) suitable for the upper computer to receive, thereby facilitating the signal receiving and processing and improving the practicability.
Drawings
FIG. 1 is a schematic diagram of a protective device of the present invention;
FIG. 2 is a schematic diagram of an overvoltage monitoring module according to the present invention;
FIG. 3 is a flow chart of the communication of the upper computer according to the present invention;
reference numerals illustrate: the device comprises a 1-protection device, a 2-protected relay, a 3-switching-on/off coil, a 4-control loop power supply, a 5-programmable logic controller, a 6-upper computer, a 51-analog quantity acquisition unit, a 52-calculation unit, a 131-voltage detection unit, a 132-voltage comparison unit, a 133-switching signal unit, a 134-analog signal unit, an 11-self-recovery fuse, a 12-piezoresistor, a 13-overvoltage monitoring module, a 14-direct current power supply, a 15-trigger contactor, a 16-buzzer, a 17-alarm lamp, an 18-reset button, a 19-conduction contactor and a 20-upper computer communication unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described herein are merely some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art without inventive faculty, are within the scope of the invention, based on the spirit of the invention.
The embodiment 1 of the invention provides a protection device for a high-voltage breaking test control loop relay, which is connected into a high-voltage breaking test control loop consisting of a protected relay 2, a switching-on/switching-off coil 3 and a control loop power supply 4, wherein the protection device 1 comprises an overvoltage protection module and an alarm module, and the alarm module comprises a local alarm module and a remote alarm module;
the overvoltage protection module comprises a self-recovery fuse 11 and a piezoresistor 12, and performs overvoltage protection on the protected relay 2 of the high-voltage breaking test control loop;
the on-site alarm module comprises an overvoltage monitoring module 13, a direct-current power supply 14, a trigger contactor 15, a buzzer 16, an alarm lamp 17, a reset button 18 and a conduction contactor 19, and is used for detecting overvoltage signals and giving an on-site alarm of overvoltage;
the remote alarm module comprises a programmable logic controller 5 and an upper computer 6, and is used for remotely alarming the overvoltage signal detected by the local alarm module.
Further preferably, the self-restoring fuse 11 is connected in series in a high-voltage breaking test control loop consisting of the protected relay 2, the on/off coil 3 and the control loop power supply 4, and has the material characteristics of presenting a low-resistance state of almost short circuit when passing through a large current, presenting a high-resistance state of almost open circuit when returning to the small current, and then changing into a low-resistance state, wherein in the embodiment, the self-restoring fuse 11 is selected from plug-in type self-restoring fuses with rated voltage of 250V, rated current of 2A, operating current of 4A and foot distance of 10 mm;
the piezoresistor 12 and the overvoltage monitoring module 13 form a parallel connection relationship with the branch where the protected relay 2 and the on/off coil 3 are located, the material characteristics of the piezoresistor are a high-resistance state which is almost open-circuited when a low voltage is applied to the two ends of the piezoresistor, the low-resistance state is almost short-circuited when a high voltage is applied to the two ends of the piezoresistor, the low-resistance state is changed into a high-resistance state after the piezoresistor is recovered to the low voltage, and in the embodiment, the piezoresistor 12 is an in-line piezoresistor with 680V voltage and 7mm diameter;
the direct current power supply 14 mainly supplies power to the overvoltage monitoring module 13, the buzzer 16 and the alarm lamp 17;
in this embodiment, the dc power supply 14 selects a dc power supply with an input voltage of 200-240V and a rated power of 100W, the overvoltage monitoring module 13 selects an overvoltage monitoring module with an operating voltage of 6.5-28V and a detection voltage range of 1V-600V, the buzzer 16 selects a buzzer with an operating voltage of 3-24V and an alarm sound of 85dB, and the alarm lamp 17 selects a buzzer with a rated voltage of 24V and a brightness of not less than 100cdm 2 Is a warning lamp;
the trigger contactor 15 and the conduction contactor 19 are in parallel connection, and are both normally open contactors, the overvoltage monitoring module 13 provides a trigger signal for the trigger contactor 15, and a branch where the reset button 18 is located provides a conduction signal for the conduction contactor 19;
the reset button 18 is a normally closed switch, and the buzzer 16, the alarm lamp 17 and the reset button 18 are in parallel connection;
the upper computer communication unit 20 outputs an electrical signal sent by the overvoltage monitoring module 13 to plc (programmable logic controller 5), and plc calculates the detected analog voltage value and then sends the calculated analog voltage value to the upper computer.
Fig. 2 is a schematic diagram of an overvoltage monitoring module, and a voltage detecting unit 131 is powered by the dc power supply 14 in fig. 1 and connected to the relay 2 to be protected and the on/off coil 3 for measuring the voltage V thereof in The method comprises the steps of carrying out a first treatment on the surface of the The voltage comparing unit 132 is used for determining the overvoltage and setting the threshold voltage thereof as V SET The voltage detected by the voltage detecting unit 131 is equal to or less than V SET The voltage comparing unit 132 will not transmit signals to the subsequent part, otherwise, the switching signal unit 133 will transmit a trigger signal for a certain time to the trigger contactor 15, the trigger signal is a +5v dc voltage for triggering the trigger contactor 15, and the analog signal unit 134 will transmit analog signals to the upper computer communication unit 20, the analog signal is a OUT ＝0.5+0.0125*V in Sheet (S)The bit is V; the detection voltage range of the overvoltage monitoring module is 1V-600V, and the output analog signal is 0-8V; specifically, the input voltage Vin is 600V (i.e. upper detection limit), brought into A OUT ＝0.5+0.0125*V in The output is 8V, and when the input is 0V (i.e., the lower limit of the overvoltage detection range), the output is 0.5V. In practice, the lower limit of the detection range should be theoretically 0V, but the error is practically 1V.
FIG. 3 is a communication flow chart of the upper computer, and the overvoltage V in After being detected by the voltage detection unit 131 in the overvoltage monitoring module 13, the voltage is outputted A through the analog signal unit 134 OUT ＝0.5+0.0125*V in The signal is transmitted to an analog acquisition unit 51 in the programmable logic controller 5 through a twisted pair, and is reversely pushed by a calculation unit 52 to output V in ＝(A OUT -0.5)/0.0125, which is transmitted to the upper computer 6 via the network cable and displayed.
The embodiment 2 of the invention provides a protection method for a high-voltage breaking test control loop relay, which comprises the following steps:
the high-voltage breaking test control loop works normally;
the overvoltage protection module performs overvoltage protection on the protected relay 2 when overvoltage is generated when primary voltage is coupled into the secondary circuit or the test control circuit is disconnected;
the alarm module triggers an alarm after detecting the overvoltage, and comprises:
triggering an on-site alarm after the on-site alarm module detects the overvoltage;
the remote alarm module carries out remote alarm on the overvoltage signal detected by the local alarm module.
1) The high-voltage breaking test control loop is a loop where the protected relay 2 is normally operated, the protection device 1 can normally operate without being connected, and the normal working flow is briefly described as follows:
the initial state of the protected relay 2 is off, the loop is not conducted, the on/off coil 3 is not electrified, the corresponding on-circuit breaker (namely, the on-circuit breaker of primary equipment does not act when the on-circuit breaker of the control loop of fig. 1 is electrified, and the on-circuit breaker acts) does not act, when the protected relay 2 receives a conduction signal which lasts for a certain time, the control loop is conducted in the time, the on/off coil 3 is electrified, and the corresponding on-circuit breaker acts;
2) The protection process of the protection device 1 on the protected relay 2 is as follows:
when the primary voltage is coupled into the secondary circuit or the protected relay 2 generates overvoltage which can damage the secondary circuit or the protected relay 2 when the control circuit is opened, the piezoresistor 12 presents a low-resistance state which is almost short-circuited by the material characteristic, a branch circuit formed by the protected relay 2 and the on/off coil 3 is short-circuited, larger current is generated when the overvoltage acts on the piezoresistor 12, the material characteristic of the self-recovery fuse 11 is triggered, the self-recovery fuse presents a high-resistance state which is almost open, the control circuit is disconnected, the protected relay 2 is prevented from being damaged by overvoltage and overcurrent, the self-recovery fuse 11 and the piezoresistor 12 return to the low-resistance state and the high-resistance state respectively after the overvoltage disappears, and the control circuit returns to a normal working state;
3) The realization process of the on-site alarm function of the protection device 1 is as follows:
the overvoltage monitoring module 13 sends a trigger signal which lasts for a certain time to the trigger contactor 15 after detecting overvoltage, the trigger contactor 15 receives the trigger signal and then is attracted, the buzzer 16, the alarm lamp 17 and the reset button 18 are powered on, the buzzer 16 gives out warning sound, the alarm lamp 17 gives out light, a branch where the reset button 18 is positioned provides a conduction signal for the conduction contactor 19, the conduction contactor 19 receives the conduction signal and then continues to attract, and at the moment, even if the trigger signal stops sending, the buzzer 16 and the alarm lamp 17 are still in a working state;
further, the protection device 1 realizes the in-situ alarm release function as follows: pressing the reset button 18, wherein the branch circuit stops providing a conduction signal to the conduction contactor 19, and the buzzer 16 and the alarm lamp 17 are powered off to stop working;
3) The protection device 1 can transmit alarm signals to the upper computer 6 through the programmable logic controller 5 to realize a remote alarm function, and the realization process of the remote alarm function is as follows:
after detecting the overvoltage, the overvoltage monitoring module 13 converts the voltage in an equal ratio mode and transmits an analog signal of 0-8v to the programmable logic controller 5, and the programmable logic controller 5 restores the signal and displays the restored signal in the upper computer 6.
A terminal comprising a processor and a storage medium; the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method.
A computer readable storage medium having stored thereon a computer program which when executed by a processor realizes the steps of the method.
The invention has the beneficial effects that compared with the prior art:
the invention uses the piezoresistor and the self-recovery fuse in a matched way, so that the relay is protected from the coupling of the primary circuit and the secondary circuit in the high-voltage breaking test process or the damage of overvoltage generated when the relay breaks a control circuit, the safety of the relay in the high-voltage breaking test process is protected, the protection cost is reduced, and the circuit safety and the overvoltage limiting effect are improved.
The invention sends out alarm signals on site and remotely through the cooperation of the overvoltage detection module, the buzzer, the alarm lamp, the upper computer communication and the like, thereby helping operation and maintenance personnel to master the state of the control system and being beneficial to timely taking countermeasures. Meanwhile, the invention considers the conversion mode between the digital signal and the analog signal, reasonably converts the digital signal and the analog signal, converts the detected voltage signal (1-600V) into the signal (0-8V) suitable for the upper computer to receive, thereby facilitating the signal receiving and processing and improving the practicability.
The present disclosure may be a system, method, and/or computer program product. The computer program product may include a computer readable storage medium having computer readable program instructions embodied thereon for causing a processor to implement aspects of the present disclosure.
The computer readable storage medium may be a tangible device that can hold and store instructions for use by an instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: portable computer disks, hard disks, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static Random Access Memory (SRAM), portable compact disk read-only memory (CD-ROM), digital Versatile Disks (DVD), memory sticks, floppy disks, mechanical coding devices, punch cards or in-groove structures such as punch cards or grooves having instructions stored thereon, and any suitable combination of the foregoing. Computer-readable storage media, as used herein, are not to be construed as transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., optical pulses through fiber optic cables), or electrical signals transmitted through wires.
The computer readable program instructions described herein may be downloaded from a computer readable storage medium to a respective computing/processing device or to an external computer or external storage device over a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmissions, wireless transmissions, routers, firewalls, switches, gateway computers and/or edge servers. The network interface card or network interface in each computing/processing device receives computer readable program instructions from the network and forwards the computer readable program instructions for storage in a computer readable storage medium in the respective computing/processing device.
Computer program instructions for performing the operations of the present disclosure can be assembly instructions, instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, c++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer readable program instructions may be executed entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, aspects of the present disclosure are implemented by personalizing electronic circuitry, such as programmable logic circuitry, field Programmable Gate Arrays (FPGAs), or Programmable Logic Arrays (PLAs), with state information of computer readable program instructions, which can execute the computer readable program instructions.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (13)
1. The utility model provides a protection device for high voltage breaking test control circuit relay, includes overvoltage protection module and alarm module, high voltage breaking test control circuit is including being established ties in proper order protected relay (2), close/break gate coil (3), control circuit power (4) are for high voltage breaking test control circuit power supply, its characterized in that:
the overvoltage protection module adopts a self-recovery fuse (11) and a piezoresistor (12) to carry out overvoltage protection on a protected relay (2) of a high-voltage breaking test control loop;
and the alarm module is used for detecting an overvoltage signal and giving an overvoltage alarm.
2. A protection device for a high voltage breaking test control loop relay according to claim 1, characterized in that:
the self-recovery fuse (11) is connected in series between the protected relay (2) and the control loop power supply (4);
the piezoresistor (12) is connected with the branch where the protected relay (2) and the switching-on/switching-off coil (3) are located in parallel.
3. A protection device for a high voltage breaking test control loop relay according to claim 1, characterized in that:
the alarm module comprises an on-site alarm module and a remote alarm module;
the on-site alarm module detects overvoltage signals and gives an on-site overvoltage alarm;
and the remote alarm module carries out remote alarm on the overvoltage signal detected by the local alarm module.
4. A protection device for a high voltage breaking test control loop relay according to claim 3, characterized in that:
the on-site alarm module comprises an overvoltage monitoring module (13), a direct-current power supply (14), a trigger contactor (15), a buzzer (16), an alarm lamp (17), a reset button (18) and a conduction contactor (19);
the overvoltage monitoring module (13) is connected in parallel with the branch where the protected relay (2) and the switching-on/switching-off coil (3) are located;
the buzzer (16), the alarm lamp (17) and the reset button (18) are connected in parallel and are connected with the overvoltage monitoring module (13) through the trigger contactor (15);
the conducting contactor (19) is connected with the triggering contactor (15) in parallel, and both the conducting contactor and the triggering contactor are normally open contactors;
the overvoltage monitoring module (13) provides a trigger signal to a trigger contactor (15);
the reset button (18) is a normally closed switch and provides a conduction signal for the conduction contactor (19);
the direct-current power supply (14) supplies power to the overvoltage monitoring module (13), the buzzer (16) and the alarm lamp (17).
5. A protection device for a high voltage breaking test control loop relay according to claim 4, wherein:
and after the overvoltage detected by the overvoltage monitoring module (13), converting the voltage into an analog signal in an equal ratio mode and transmitting the analog signal to a remote alarm module.
6. A protection device for a high voltage breaking test control loop relay according to claim 5, wherein:
the overvoltage monitoring module (13) comprises a voltage detection unit (131), a voltage comparison unit (132), a switch signal unit (133) and an analog signal unit (134);
the voltage detection unit (131) is connected in parallel with the branch where the protected relay (2) and the switching-on/switching-off coil (3) are located and is used for measuring the voltage V of the branch in ；
The voltage comparison unit (132) is used for judging the overvoltage when the voltage V in Greater than or equal to threshold voltage V SET When the remote alarm module is in operation, a trigger signal with a set duration is sent to the trigger contactor (15) through the switch signal unit (133), and meanwhile, analog signals are transmitted to the remote alarm module through the analog signal unit (134);
the trigger signal is a direct-current voltage of +5V;
the analog signal is A OUT ＝0.5+0.0125*V in The unit is V.
7. A protection device for a high voltage breaking test control loop relay according to claim 3, characterized in that:
the remote alarm module comprises a programmable logic controller (5) and an upper computer (6);
the programmable logic controller (5) acquires an analog signal sent by the overvoltage monitoring module (13) through the upper computer communication unit (20) and restores the signal to be displayed in the upper computer (6).
8. A protection device for a high voltage breaking test control loop relay according to claim 7, wherein:
the programmable logic controller (5) comprises an analog quantity acquisition unit (51) and a calculation unit (52);
the analog quantity acquisition unit (51) receives an analog signal A OUT And transmitting to a computing unit (52), and outputting V after the computing unit (52) reversely pushes in ＝(A OUT -0.5)/0.0125。
9. A protection method for a high-voltage breaking test control loop relay is characterized by comprising the following steps of:
the method comprises the following steps:
the high-voltage breaking test control loop works normally;
when the overvoltage protection module generates overvoltage when the primary voltage is coupled into the secondary circuit or the test control circuit is disconnected, the self-recovery fuse (11) and the piezoresistor (12) are adopted to carry out overvoltage protection on the protected relay (2);
and triggering an alarm after the alarm module detects the overvoltage.
10. The protection method for a high voltage breaking test control loop relay according to claim 9, wherein:
the normal working process of the high-voltage breaking test control loop is as follows:
the initial state of the protected relay (2) is off, the loop is not conducted, the on/off coil (3) is not electrified, the corresponding closing circuit breaker does not act, when the protected relay (2) receives a conduction signal for a set duration, the control loop is conducted in the duration, the on/off coil (3) is electrified, and the corresponding closing circuit breaker acts.
11. The protection method for a high voltage breaking test control loop relay according to claim 9, wherein:
when the overvoltage protection module generates overvoltage when primary voltage is coupled into a secondary circuit or a test control circuit is disconnected, the overvoltage protection process of the protected relay (2) by adopting the self-recovery fuse (11) and the piezoresistor (12) is as follows:
when the primary voltage is coupled into the secondary circuit or the test control circuit is disconnected, the overvoltage protection module short-circuits the branch formed by the protected relay (2) and the on/off coil (3) through the low-resistance state of the piezoresistor (12), the overvoltage generates large current when acting on the piezoresistor (12), and then the control circuit is disconnected to prevent the protected relay (2) from being damaged by overvoltage and overcurrent through triggering the high-resistance state of the self-recovery fuse (11), and after the overvoltage disappears, the self-recovery fuse (11) and the piezoresistor (12) return to the low-resistance state and the high-resistance state respectively, and the control circuit returns to the normal working state.
12. The protection method for a high voltage breaking test control loop relay according to claim 9, wherein:
the alarm module triggers an on-site alarm after detecting the overvoltage, and the specific process is as follows:
the alarm module sends a trigger signal with a set duration to the trigger contactor (15) after the overvoltage monitoring module (13) detects overvoltage, the trigger contactor (15) receives the trigger signal and then is attracted, so that the buzzer (16), the alarm lamp (17) and the reset button (18) are powered on, the buzzer (16) sends out warning sounds, the alarm lamp (17) sends out light, the branch where the reset button (18) is located provides a conduction signal for the conduction contactor (19), the conduction contactor (19) continues to attract after receiving the conduction signal, and even if the trigger signal stops sending, the buzzer (16) and the alarm lamp (17) are still in a working state until the reset button (18) is pressed down to release the on-site alarm.
13. A method of protecting a high voltage breaking test control loop relay according to claim 12, wherein:
the alarm module carries out remote alarm on the detected overvoltage signal, and the specific process is as follows:
the alarm module converts the voltage after detecting overvoltage by the overvoltage monitoring module (13) into an equal ratio and transmits an analog signal to the programmable logic controller (5), and the programmable logic controller (5) restores the signal and displays the signal in the upper computer (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311668780.2A CN117712987A (en) | 2023-12-06 | 2023-12-06 | Protection device and method for high-voltage breaking test control loop relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311668780.2A CN117712987A (en) | 2023-12-06 | 2023-12-06 | Protection device and method for high-voltage breaking test control loop relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117712987A true CN117712987A (en) | 2024-03-15 |
Family
ID=90159846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311668780.2A Pending CN117712987A (en) | 2023-12-06 | 2023-12-06 | Protection device and method for high-voltage breaking test control loop relay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117712987A (en) |
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2023
- 2023-12-06 CN CN202311668780.2A patent/CN117712987A/en active Pending
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