TWI687013B - Circuit breaker tripping device - Google Patents

Abstract

The invention relates to a circuit breaker tripping device, which integrates power input terminals of a power circuit, a voltage detecting device, a current detecting device, and an external support unit for power input and the microcontroller. By the microcontroller and the internal circuit, the proposed invention ensuring the action of the circuit breaker tripping loop, and improve the previous scheme's shortcomings. At the same time, the microcontroller unit can process according to the detected signal, and display the status of the power circuit, the fault warning and the working state of the trip circuit to visualize the display interface for easy inspection and maintenance, and improve the safety of the power system.

Description

Circuit breaker tripping device

The invention is a circuit breaker tripping device, which integrates the power input power of the power circuit, the voltage detection device, the current detection device, and the power input of the external support unit, through the microcontroller to sequentially control the unit and the internal circuit In addition to the signal processing of the circuit breaker, it can ensure the action of the circuit breaker tripping circuit, make the circuit breaker trip off, and improve the previous shortcomings. At the same time, the microcontroller sequential control unit can process according to the detected signal, and display the status of the power circuit, the fault warning and the working status of the trip circuit with a visual display interface, which is convenient for inspection and maintenance, and improves the safety of the power system Sex.

In the conventional power distribution system, the devices that trip the circuit after power failure are all configured under different control power conditions. As a result, the control circuit of a switchboard is different, and it is very complicated and difficult to maintain. On the power-off trip circuit, it is often caused by the failure of the working power of the trip circuit, which has not occurred so far. Get an effective improvement.

In the transmission (distribution) system, the high-voltage circuit breaker panel is a very important equipment and is valued. According to the certification requirements of Article 401 of the indoor installation rules, all high-voltage facilities, from cabinets, high-voltage transformers, circuit breakers, and voltage regulators , Current ratio, surge arrester, high voltage fuse, etc., must be verified. It stands to reason that the high-voltage system should be very reliable and safe and reliable, but in practice high-voltage The failure of power users has been heard. There are many cases found in the discussion. The crux is that the working power supply that provides the trip circuit in the high-voltage system is disabled, causing an accident! Suddenly found that in the high-voltage system, providing the power supply component of the trip circuit that the system can safely isolate the accident has indeed become a dead end in safety. When the component fails, the system cannot operate due to lack of power to isolate the high-voltage accident, the consequences are quite serious, and even cause compensation problems.

The high-voltage circuit breaker panel has three actions, one is energization and closing is ON, one is power off and off is off, and one is tripping trip isolation accident during failure. Generally, the command to drive the circuit breaker to trip is from the protection relay, and the protection The information source of the station is generally from the CT, to check whether there is an overload or short circuit accident, and the PT to check whether there is an overvoltage or low voltage condition, and the ZCT to check whether there is a grounding condition, or Excessive temperature, frequency problems, etc., the sensing device provides protection relay actuation and conduction and further disconnects the circuit breaker from the isolation accident of the circuit breaker. In the current high-voltage distribution system, many accidents cannot effectively isolate the accident point and cause the circuit breaker to trip. Many of the reasons are because the power supply of the trip circuit in the system is disabled. At present, in the world's high-voltage power distribution systems, the trip circuit power supplies used are generally divided into DC power supplies and AC power supplies. DC power supplies are generally represented by battery packs, and AC power supplies are generally represented by capacitor trip devices. the Lord. At present, the tripping methods of high-voltage circuit breakers are generally divided into two types, one is electric type and uses internal action coil; the other is mechanical type tripping. The high-voltage power distribution system accident cases are listed as follows: Case 1. The explosion of the Xintianlun Power Plant in Taiwan Radio; Case 2. A semiconductor company in Guanyin Industrial Zone. The CTD failure of the special capacitor tripping device for the protective relay in the high-voltage disk caused the Taipower substation to trip. ; Case 3: A chemical plant in Hsinchu Industrial Zone, CTD failure of a capacitor tripping device caused a 69KV main substation to trip, causing losses; Case IV, CTD failure of a chemical fiber plant in Fangyuan Industrial Zone caused a 69KV substation to trip, a semi-finished product Completely destroyed; Case 5. A factory in Indonesia protects the power station Capacity trip device CTD, insufficient capacity caused a second accident; case six, science park electronics factory expansion uninterrupted power system UPS failure; case seven, a hospital in Hualien, the capacitor trip device CTD of the high-voltage disk was accidentally touched and failed; case 8. Fukushima nuclear disaster in Japan; Case 9. Soviet Chernobyl nuclear disaster...etc. In the above case, it is nothing more than when the power supply (distribution) system, the power supply of the trip circuit of the control power supply in the circuit breaker panel is disabled, resulting in the failure of the system because there is no effective working power When an accident occurs, the circuit breaker cannot be tripped to isolate the accident, and even cause major power outages and other major losses. In summary, there is nothing more than 1. Natural disasters, 2. Human disasters, 3. Inertial habits .

The high-voltage circuit breaker (H.V.CB) or ultra-high voltage switchboard is to accept the protection relay (Relay) command as whether to trip the high-voltage circuit breaker to isolate the source of the accident. Therefore, if the circuit breaker cannot be tripped immediately when a short-circuit accident occurs in a certain business unit (receiver) as scheduled, it will cause damage to the high-voltage circuit breaker (HVCB) and extend to affect the main power supply line to supply power to other businesses Units (receivers), causing chain-like industrial losses. Whether the high-voltage circuit breaker can be tripped in time is controlled by whether the protection relay (Relay) can issue an immediate command. Therefore, when there is a problem with the working power supply of the protection relay, the protection relay will not operate; when the protection relay will not operate, the high voltage circuit breaker (HVCB) will not operate when the accident occurs, and cannot Isolate the accident point of the business unit, causing serious secondary accidents, even affecting the tripping of the feeder of Taipower! Don't be careless. Due to this high-risk industrial safety incident, accidents often occur due to misjudgment, so the power supply line operator (Taiwan Power Company), in order to prevent the relay from being short-circuited, cannot trigger the circuit breaker trip due to the sudden voltage drop, and The saturable slow action of the flow device requires the public institution to set up a protection system in accordance with the regulations before it is allowed to supply power. The main provisions are: when the secondary side power supply of the sampling and voltage regulator is supplemented by a capacitor trip device (CTD) or a capacitor trip device and then connected to a continuous power system (UPS), and the power supply type or Digital The capacitor tripping device (CTD) used by the relay shall not be used for circuit breakers or other equipment. This is ideal, but accidents often come from ideal conditions. In practice, the uninterruptible power system (UPS) will almost always fail due to battery aging after one or two years. If the DC power supply system mainly uses battery packs, the battery may be disabled after one year, but the business unit will not be aware of it. Usually, when there is a short circuit accident, it is found that the high voltage circuit breaker (HVCB) will not trip. It was found that the DC working power supply without tripping circuit could not supply the working power supply to the protection relay (Relay), but it was too late.

In the switchboard, the protection relay and the trip circuit of the circuit breaker, the working power supply of the protection relay is generally AC AC and DC DC can be used to provide the required working power. Under normal circumstances, DC power is the priority (only one of AC and DC can be selected), because DC power is generally more stable and reliable.

The applicant of the present invention has proposed and applied for several schemes for the improvement of the working power of the trip circuit in the high-voltage distribution board of the high-voltage distribution system. Especially in the improvement of the CTD of the capacitor tripping device, it can be tested under load, and the meter displays its voltage value, to the panel type, which can effectively prevent the prevention of industrial safety accidents that may be caused by opening the high-voltage switchboard. There is a voltage comparison circuit And the capacitor trip device of the alarm circuit can solve the problem that the capacitor will decay due to time. There is a combination of a time circuit and a voltage comparison circuit. It can be set daily or set a time to simulate whether the trip circuit power supply is sufficient to promote when an accident occurs The load equipment is used to isolate the accident, and there is a capacitor trip device CTD of the automatic power conversion circuit to prevent the capacitor trip device from malfunctioning. The external power supply is supported by AC and DC power supplies, and can solve the problems of voltage, capacitance and communication The above solutions are the products of the current market. And the capacitor tripping device CTD with backup power supply, the CTD capacitor tripping device for DC energy storage DC power supply, the capacitor tripping device CTD for high voltage electromagnetic switch VCS, the capacitor tripping device CTD supporting DC system, etc., All of the above improvements are designed and manufactured in order to make the working power supply of the trip circuit in the high-voltage system safer.

It can be seen from the above that the working power supply of the high-voltage circuit breaker disc tripping circuit is basically divided into two categories, one is the DC power supply of the battery pack, and the other is the AC power supply, which generally comes from the secondary side of the high-voltage voltage regulator HV PT, because when When a short-circuit accident occurs in the high-voltage system, the PT voltage of the voltage stabilizer drops to zero, resulting in no effective working power supply used in the trip circuit, resulting in the circuit breaker unable to trip the closed contact to isolate the accident, so in the AC power supply system The capacitor tripping device CTD is installed in the system as the working power supply of the high voltage disc tripping circuit of the system. Generally speaking, the working power of the trip circuit can solve most of the problems in the case of a DC battery pack or a capacitor trip device to store DC power, but under special conditions, such as a major earthquake... Waiting for natural disasters, or the negligence of human factors, may cause the trip circuit to be damaged or disabled, resulting in the circuit breaker unable to trip to isolate the accident site, for example, due to improper use of equipment, such as the use of continuous power system UPS, due to continuous The failure of the UPS internal battery in the electrical system caused the uninterruptible power system UPS to fail and resulted in many accidents. Actual cases such as the Longshan Substation caused a major power outage in the science park due to the lack of isolation of the accident, and caused a power outage caused by a power failure. The circuit breaker of the turbo power plant did not trip out, resulting in many deaths and explosions; the Fukushima nuclear power plant in Japan damaged the trip circuit line due to the earthquake, and the high voltage circuit breaker did not trip, resulting in the failure of the cooling cycle system, resulting in nuclear disaster... … Etc. The above practical cases all illustrate the importance of the working power of the trip circuit and the urgency of improvement, and there is the invention of the circuit breaker power-off and trip device.

Review the causes of failure of the tripping circuit system in the high-voltage power distribution system. The reasons for the burnout of components such as the voltage comparator PT are: 1. Bad environment, excessive humidity, 2. Poor insulation of the voltage regulator PT body ( Insulation degradation, gaps, etc.), 3. Animal invasion, etc., will cause The proportional voltage transformer PT is burned; the current transformer CT burns because the reasons are: 1. When the system has a short-circuit accident, the secondary side is burned, 2. The environment is humid, 3. The insulation is poor, 4. The ground fault... etc. , Will cause burnout of the current transformer CT; generally speaking, the secondary side of the current transformer CT must not be open to generate high voltage, and burn the current CT, so the secondary side of the current transformer CT must be connected in series with load impedance to avoid open circuit; Generally speaking, the secondary side of the voltage regulator PT must not be short-circuited, which will cause excessive fault current and burn the voltage regulator PT. Therefore, the secondary side of the voltage regulator PT must be connected in parallel with the load impedance to avoid short circuit, and its control in a general AC system The power supply generally uses the power supply with secondary voltage PT as the working power source of the trip circuit. In the high-voltage system, the secondary side of the CT is a general power supply, electrically connected to the meter indicating current and protection relay, and the secondary side of the PT is a general voltage source, electrically connected to the meter indicating voltage and protection According to the power, the electric energy is equal to the voltage multiplied by the current (single phase), and the three phases are multiplied by √3 times the electric energy. When the open-circuit current source on the secondary side of the current transformer CT approaches zero, high voltage will be generated between the two ends. When the secondary side short-circuit voltage source of the transformer PT approaches zero, high current will be generated between the two ends, so when the system fails, there will be abnormal state power in the voltage comparator PT or current transformer CT. In addition, the external power supply is disabled, Line disconnection or line short circuit etc. will affect the working power supply of the trip circuit.

The problems presented by the above accident cases, regardless of whether they are natural disasters or human disasters, the tripping system of the trip circuit is disabled, and a huge accident occurs accordingly. Therefore, under the existing architecture, the power distribution board cannot be changed. The structure, the setting value of the protection relay cannot be changed, the structure of the circuit breaker cannot be changed... etc., with the invention of the circuit breaker power-off trip device in this case, the function of its original trip circuit system is enhanced to achieve the previous Unprotected security functionality. In summary, when the control circuit based on DC power or AC power is used in the trip circuit of the high-voltage disk and the electrical energy is disabled, the actual situation in the field is faced. In the past, this problem could not be effectively solved. Therefore, from the actual needs in the field, a circuit breaker tripping device can To solve the above problems, and at the same time improve the safety and stability of its power distribution system.

The invention is a circuit breaker tripping device, which integrates the power input power of the power circuit, the voltage detection device, the current detection device, and the power input of the external support unit, through the microcontroller to sequentially control the unit and the internal circuit In addition to the signal processing of the circuit breaker, it can ensure the action of the circuit breaker tripping circuit, make the circuit breaker trip off, and improve the previous shortcomings. At the same time, the microcontroller sequential control unit can process according to the detected signal, and display the status of the power circuit, the fault warning and the working status of the trip circuit with a visual display interface, which is convenient for inspection and maintenance, and improves the safety of the power system Sex.

To achieve the above object, a circuit breaker tripping device is electrically connected to a power circuit, and the power circuit has at least one trip coil for disconnecting the circuit breaker of the power circuit to link the circuit breaker The trip mechanism opens the circuit breaker; and the circuit breaker power-off and trip device includes: a voltage detection device provided on the power circuit at least one, the voltage detection device includes a voltage reduction for reducing the output voltage Unit; a current detection device provided on at least one of the power circuit, the current detection device includes a current reducing unit for reducing the output current; a at least one protection relay provided on the power circuit, the protection The relay sets at least one kind of protection electrical safety setting value such as current, grounding, voltage, frequency, temperature, etc. according to the power system circuit, load status and protection coordination requirements, when the value of the detection device is greater than the electrical safety setting value The normally open contact of the protection relay is activated; the improved device of the circuit breaker tripping circuit is mainly based on the current detection device, which can be supplemented by AC or DC connected with the voltage detection device, battery pack, external power supply, etc. The electrical energy output is the power supply of the control loop, then connect the protection relay normally open contact or remote intelligent forced power off command contact, connect the auxiliary contact of the series circuit breaker, and then connect the trip coil of the circuit breaker in series Form a tripping loop system. The protection relay normally open contact or remote intelligent forced power off command contact is turned on. When the circuit breaker is closed and the auxiliary contact is activated, the trip coil of the circuit breaker is subject to the drop of the control circuit power supply or current detection device The electric energy of the flow unit is activated to drive the trip mechanism of the circuit breaker to open the circuit breaker.

To achieve the above object, a circuit breaker tripping device is electrically connected to a power circuit, and the power circuit has at least one trip coil for disconnecting the circuit breaker of the power circuit to link the circuit breaker The trip mechanism opens the circuit breaker; and the circuit breaker power-off and trip device includes: a voltage detection device provided on the power circuit at least one, the voltage detection device includes a voltage reduction for reducing the output voltage Unit; a current detection device provided on at least one of the power circuit, the current detection device includes a current reducing unit for reducing the output current; a at least one protection relay provided on the power circuit, the protection The relay sets at least one type of protection electrical safety setting value such as current, ground, voltage, frequency, temperature, etc. according to the power system line, load status and protection coordination requirements. When the value of the detection device is greater than the electrical safety setting value, the normally open contact of the protection relay is activated; the improved device of the circuit breaker tripping circuit is connected to the normally open connection of the protection relay in series with a current detection device The point or remote intelligent forced power off command contact, the series circuit breaker closing auxiliary contact, and the trip coil of the circuit breaker are connected in series to form a trip circuit system. When the normally open contact of the protection relay or the remote intelligent forced power off command contact is activated, when the circuit breaker is closed and the auxiliary contact is activated, the trip coil of the circuit breaker uses the power of the current detection device to reduce the current To drive the trip mechanism of the circuit breaker to open the circuit breaker.

In order to achieve the above purpose, the circuit breaker power-off and trip device of the present invention is related to a The power circuit is electrically connected, and the power circuit has at least one trip coil for opening the circuit breaker of the power circuit to link the trip mechanism of the circuit breaker to disconnect the circuit breaker; and a circuit provided on the power circuit is at least A voltage detection device, the voltage detection device includes a step-down unit for reducing the output voltage; and at least one current detection device provided on the power circuit, the current detection device includes a Output current reduction unit; and at least one protection relay provided on the power circuit, the protection relay sets at least one of its protection electrical safety settings according to the state of the power system circuit such as current, ground, voltage, frequency , Temperature, etc., when the protection relay is electrically connected to the detection device such as current, ground, voltage, frequency, temperature, etc., when the value of the detection device is greater than the protection relay setting its protective electrical safety setting value, the The normally open contact of the protection relay is activated; and the circuit breaker power-off trip device includes: a main control board, the main control board electrical connection includes an external power connection unit, an internal voltage comparison unit, a micro control Sequencer control unit, a trip circuit power supply circuit, a capacitor energy storage circuit, a sensing device connection unit, an external device device connection unit, a trip circuit connection unit, a status display unit. The trip loop power circuit is electrically connected to the microcontroller sequential control unit, and the appropriate electrical energy output is used as the trip loop drive power; the capacitor energy storage circuit, the capacitor energy storage circuit is electrically connected to the trip loop power supply Circuit, suitable for storing DC power; the external power connection unit electrically connects external AC power and DC power to the main control board; the internal voltage comparison unit electrically connects the external power connection unit and the sensing device Unit, the status display unit; the microcontroller sequential control unit, which is electrically connected to the external power connection unit, the sensing device connection unit, and the internal voltage comparison unit, and selects an appropriate power to be electrically connected to the Trip circuit power supply circuit; the trip circuit connection unit, the trip circuit connection unit is electrically connected in series to each contact of the external device connection unit on the main control board to form a trip back Circuit, and electrically connected to the trip loop power supply circuit; the sensing device connecting unit, the sensing device connecting unit at least includes the current detection device and the voltage detection device at least two items of detection units, electrically connected To the protection relay on the power circuit; the external equipment connection unit, the external equipment connection unit at least includes a normally open contact of the protection relay, both ends of the tripping coil of the circuit breaker or the external mandatory command The contact; the status display unit, which can display the status of the system trip circuit and the status of each power supply; the circuit breaker power off trip device can be based on the current detection device output current of the current reduction unit is the current The step-down unit of the source energy or the output voltage of the voltage detection device is the voltage source energy, which is rectified into DC energy, and then the capacitor energy storage circuit stores the DC energy or external energy, and the micro-controller sequential control unit from the jumper The trip circuit power circuit provides trip driving power, and a complete trip circuit is formed through the trip circuit connection unit. When the auxiliary contact of the circuit breaker is closed, the trip coil of the circuit breaker is driven to link the circuit breaker. The trip mechanism opens the circuit breaker.

To achieve the above object, a circuit breaker tripping device is electrically connected to a power circuit, and the power circuit has at least one trip coil for disconnecting the circuit breaker of the power circuit to link the circuit breaker. The tripping mechanism opens the circuit breaker; and at least one voltage detection device provided on the power circuit, the voltage detection device includes a step-down unit for reducing the output voltage; and a device provided on the power circuit At least one current detection device, the current detection device includes a current-reducing unit for reducing the output current; and at least one protection relay provided on the power circuit, the protection relay according to the state of the power system circuit , Set at least one of its protection electrical safety settings such as current, ground, voltage, frequency, temperature, etc., when the protection relay is electrically connected to the detection device such as current, ground, voltage, frequency, temperature, etc., when the detection When the device value is greater than the protection relay setting and the protection electrical safety setting value, the normally open contact of the protection relay actuates conduction; The circuit breaker tripping device includes: a main control board, the main control board electrical connection includes an AC-DC conversion circuit, a trip circuit power supply circuit, a capacitor energy storage circuit, a power automatic switching circuit, A sensing device connection unit, an external device connection unit, and a status display unit; the AC/DC conversion circuit, the AC/DC conversion circuit is electrically connected to the step-down unit of the voltage detection device, or an external AC power to connect AC energy is converted into DC energy, and the capacitor energy storage circuit is used to store the DC energy; the trip loop power circuit is at least electrically connected to the voltage detection device voltage reduction unit, the current detection device current reduction unit or an external connection Support the power supply; the capacitor energy storage circuit, the capacitor energy storage circuit is electrically connected to the AC-DC conversion circuit in the trip loop power circuit, and stores appropriate DC energy; the power supply automatically alternates the circuit, electrically connects the trip Loop power supply circuit, the capacitor energy storage circuit uses appropriate electrical energy output as tripping loop driving energy; the sensing device connection unit, the sensing device connection unit at least includes the current detection device and the voltage detection device The above detection unit is electrically connected to the protection relay on the power circuit; the external equipment connection unit, the external equipment connection unit at least includes a normally open contact of the protection relay and the trip of the circuit breaker The two ends of the coil or the external forced command contact; the status display unit, which can display the status of the system trip circuit; the circuit breaker power-off trip device can be based on the output current of the current detection device The current unit is the current source power or the output voltage of the voltage detection device. The step-down unit is the voltage source power, which is rectified into DC power, and then the capacitor energy storage circuit stores DC power or external power, and is provided by the power supply automatic alternating circuit. The trip drive power is then connected in series with the normally open contact of the protection relay, or the normally open contact of the protection relay is then connected in parallel with the external forced command contact to activate, and when the circuit breaker is closed, the auxiliary contact is activated and driven. The trip coil of the circuit breaker is used to link the circuit breaker trip mechanism to open the circuit breaker.

The principle and technical features of the present invention will be explained in conjunction with the diagram as follows:

1: Circuit breaker power off trip device

10: Circuit breaker

11: Current detection device

12: Voltage detection device

13: Tripping mechanism

14: Circuit breaker closing auxiliary contact

15: Trip coil

16: Protection relay normally open contact

17: Remote intelligent forced power off command contact

18: Trip circuit power circuit

19: Protection relay

20: Power supply automatic alternating circuit

21: Sensing device connection unit

22: External device connection unit

23: Status display unit

24: External support unit

25: External power connection unit

26: Trip circuit connection unit

30: Main control board

180: Internal voltage comparison unit

181: The first detection circuit

182: The first display unit

183: microcontroller sequential control unit

184: AC-DC conversion circuit

185: DC power alternating circuit

186: Second detection circuit

187: Second display unit

188,189: Switch B contact

190: Capacitor energy storage circuit

191: DC power supply parallel output circuit

192: Third detection circuit

193: Third display unit

Figure 1 Schematic diagram of the circuit breaker power off and trip device

Figure 2 Schematic diagram of the current detection device (current ratio) circuit

Figure 3 Schematic diagram of the trip circuit of the circuit breaker power off trip device

Figure 4 Schematic diagram of the circuit breaker power off and trip device

Figure 5 Schematic diagram of the visual display of the circuit breaker power off and trip device

The circuit breaker power-off and trip device of the present invention has the action principle of the trip circuit as shown in Figure 1. A circuit breaker 10 is provided on the power circuit, the circuit breaker 10 has a trip coil 15, and the trip coil 15 is linked to The tripping mechanism 13 of the circuit breaker 10; a voltage detection device 12 (such as a voltage comparator) is provided on the power circuit. The voltage detection device 12 includes a step-down unit for reducing the output voltage; Sexually connected to the protection relay 19 and the trip circuit power supply circuit 18. The power circuit is also provided with a current detection device 11 (such as a current comparator). The current detection device 11 includes a current reduction unit for reducing the output current; the current reduction unit is electrically connected to the protection relay 19 and the jumper The off-loop power supply circuit 18, the tripped-loop power supply circuit 18 selects the corresponding electrical energy in series with the protection relay 19 via the power supply automatic alternation circuit 20 to connect the protection relay normally open contact 16. The protection relay 19 sets its protection electrical safety setting value according to the power system line, load status and protection coordination requirements. When the protection setting value is reached, the protection relay normally open contact 16 is activated and can be connected in parallel The intelligent forced power off command contact 17 is connected in series with the circuit breaker to close the auxiliary contact 14, and then the trip coil 15 of the circuit breaker 10 is connected in series to form a trip circuit system. In this way, the electrical energy of the current detection device 11 (such as a current transformer) and the electrical energy of the voltage detection device 12 (such as a voltage regulator) can be introduced to further improve the trip coil 15 of the circuit breaker 10 when an accident occurs There is enough power to drive to isolate the accident.

Please refer to FIG. 2 for further description of the principle of the present invention. As shown in the shaded box in FIG. 2, it is a schematic diagram of an equivalent circuit of a general current detection device (current comparator). The current of the current-dropping unit of the current detection device 11 flows through an ammeter to form a complete loop. In order to further introduce the current of the current detection device 11 (such as a current transformer) as the power supply for the circuit breaker 10 to trip the coil 15, the present invention connects a side branch path of the current detection device 11 in parallel with the current lowering unit. This side branch path when the power system is normal, the protection relay 19 is not activated, the internal protection relay normally open contact 16 is open, and the circuit breaker 10 The auxiliary contact 14 for closing the circuit breaker is in the conducting state, and no current flows through the side branch path at this time. However, when the power system fails, the protection relay 19 operates, the protection relay normally open contact 16 is turned on, and the circuit breaker closing auxiliary contact 14 is also turned on. The side branch path constitutes a complete loop conduction state, and the current detection device 11 ( For example, the current of the down-converting element passes through the side branch path, so it can be used as the power required for the circuit breaker 10 to trip the coil 15 and drive it.

Combining the technical characteristics of the side branch path of the current-reducing unit of the current detection device 11 (such as a current transformer) with the design of the conventional circuit breaker tripping power supply, please refer to FIG. 3. The shaded square in the upper left of Figure 3 indicates that in the conventional technique, the battery pack BAT, the capacitor tripping device CTD or the uninterruptible power system UPS is used as the tripping power supply for the tripping coil 15 of the circuit breaker 10, which is usually under normal circumstances. It is sufficient to provide the driving power required for the circuit breaker 10 to trip the coil 15. However, when the battery, the capacitor trip device or the uninterruptible power system is disabled due to human negligence and natural disasters, the trip coil 15 will not be able to drive to isolate the accident, which will cause great harm. If the technical characteristics of the current source of the current-reducing unit introduced into the current detection device 11 (such as a current transformer) are integrated, as can be seen from FIG. 3, when the system fails (the protection relay normally open contact 16 is conductive), if When the battery pack, capacitor trip device or uninterruptible power system of the conventional technique are all disabled, the current of the power circuit continues to pass through the circuit breaker 10 at this time, so the current detection device 11 (such as a current regulator) The current source continues to have current flowing (see Figure 2). At this time, the automatic power supply alternating circuit 20 is switched to the circuit of the current detection state 11 due to the battery pack, capacitor tripping device or uninterruptible power system of the conventional technique. The current flows into the circuit breaker as shown by the dotted arrow The trip coil 15 of 10 is driven by the trip mechanism 13 to cut off the closed main contact of the circuit breaker 10 to isolate the accident point, which further improves the stability of the circuit breaker trip circuit system to ensure the operation of the power system Security.

As mentioned above, the circuit breaker tripping device of the present invention wants to ensure the tripping of the circuit breaker The circuit can be stably executed, and the visual interface is convenient for understanding the operation of the circuit breaker and the status inspection of the power circuit. A preferred embodiment is shown in FIG. 4. Components or blocks with the same function in the illustration are marked with the same number. Please refer to FIG. 4, the circuit breaker power-off tripping device 1 has an external power connection unit 25 to connect the relevant inputs of the external support unit 24, the voltage detection side device 12, the current detection device 11 and the protection relay 19, etc. Terminal signal connection. The external power connection unit 25 then connects the input terminal signal to the corresponding circuit of the main control board 30. The external support unit 24 may be, for example, a battery pack BAT, a capacitor trip device CTD, or an uninterruptible power system UPS. For example, taking the battery pack as an example, the external support unit 24 connects the signal to the DC input terminal of the DC power supply alternating circuit 185 and the AC input terminal of the step-down unit connected to the voltage detection device 12 via the external power connection unit 25. The external support unit 24 is, for example, a battery pack, and can be used as one of the power sources required for the operation of the circuit breaker trip circuit. In addition, the step-down unit of the voltage detection device 12 is also connected to the AC input terminal via an external power connection unit 25, and is converted into a DC power source through an AC/DC conversion circuit 184. The AC/DC conversion circuit 184 is generally a bridge rectifier filter. The converted DC power supply and the power output from the connected external support unit 24 are simultaneously connected to the DC power supply alternating circuit 185. When the output from the voltage step-down unit of the voltage detection device 12 is energized , The DC power output of the AC/DC conversion circuit 184 is preferentially used to charge the capacitor energy storage circuit 190, and the capacitor is used to store the electric energy required for the trip circuit. If the step-down unit of the voltage detection device 12 is disabled, the DC power alternating circuit 185 selects the power supply of the external support unit 24 to charge the capacitor energy storage circuit 190. The DC power alternating circuit 185 can usually be achieved by using a relay module with a closed contact or a switching module with the same function (not shown). The output power of the alternating-current DC power supply circuit 185 (that is, the output power of the capacitor energy storage circuit 190) and the power supply of the external support unit 24 are simultaneously input to the DC power parallel output circuit 191, and the DC power parallel output circuit 191 is stored in parallel with the capacitor The energy of the energy circuit 190 is given priority It provides the power needed to trip the circuit. The DC power parallel output circuit 191 can usually be achieved by using a relay module with a closed contact or a switching module with the same function (not shown). In order to easily check the status of the trip circuit power supply circuit 18, the outputs of the external support unit 24, the capacitor energy storage circuit 190, and the DC power parallel output circuit 191 can be connected to the detection circuit and the display unit, such as the meter head and seven segments Display or other liquid crystal display panel (not shown). The detection circuit is provided with a voltage comparison circuit to judge whether the voltage is higher than a preset value to carry out necessary warning.

The external power connection unit 25 also simultaneously connects the external power signal to the internal voltage comparison unit 180. The internal voltage comparison unit 180 is, for example, a voltage-dividing current circuit, which is isolated by the optical coupling chip to detect the power status of each phase sequence (Powered/unpowered), and input a signal to the microcontroller sequence control unit 183. The microcontroller sequential control unit 183 determines whether the power circuit has fault conditions such as under-phase, reverse power transmission, tripping, etc. according to the presence or absence of the phase sequence voltage signals (such as R, S, T, U, V, W phase). And the corresponding warning is displayed by the status display unit 23 accordingly.

As shown in the circuit diagram of the current detection device (current transformer) shown in FIG. 2, the wiring of the side branch path is connected through the trip circuit connecting unit 26. The trip circuit connection unit 26 electrically connects the external device connection unit 22 and each contact in series to form a trip circuit, and is electrically connected to the trip circuit power circuit 18, and the side branch path in FIG. 2 is conducted At this time, the side branch current of the trip circuit connecting unit 26 and the output of the DC power parallel output circuit 191 are connected to the power automatic switching circuit 20. The power automatic alternating circuit 20 preferentially selects the power from the DC power parallel output circuit 191, DC When the power supply of the parallel power output circuit 191 is disabled, it switches to the side branch path of the current-reducing unit of the current detection device 11. At this time, the normally open contact 16 of the protection relay is turned on, and the auxiliary contact 14 of the circuit breaker is closed, and the current The current of the detection device 11 flows through the side branch path to drive the trip coil 15 to actuate the trip mechanism 13 to isolate the accident point. In the same way, the power supply automatically alternates the circuit 20. It can usually be achieved by using a relay module with a closed contact or a switching module with the same function (not shown). The simulated fault occurrence command in FIG. 4 can be issued through the microcontroller sequential control unit 183 to facilitate testing the working state of the trip loop power circuit 18. In addition, the external command driving the remote intelligent forced power off command contact 17 can also be received by the microcontroller sequential control unit 183 from the remote command to control the trip coil 15 of the circuit breaker 10. As mentioned above, the external device connection unit 22 includes a protection relay normally open contact 16, both ends of the trip coil 15 of the circuit breaker 10, or a remote intelligent forced power off command contact 17. The sensing device connection unit 21 includes at least two signals detected by the current detection device and the voltage detection device.

Referring again to FIG. 5, which is the status display panel of the visual interface of the circuit breaker tripping device of the present invention, the signal interface displayed is connected to the microcontroller sequential control unit 183, which can display the status of the system trip circuit and each Power status.

In summary, the circuit breaker tripping device of the present invention further improves the stability of the circuit breaker tripping circuit system, has deep industrial utility, and checks related products and approved patent announcements on the market, It is not seen that those with the same technical features as the essence of the present invention are also in compliance with the novelty and progressive legal patent application requirements. Aid to file a patent application in accordance with the law, and urge your reviewer to grant the patent in this case as soon as possible to ensure the rights and interests of the applicant. However, the ones disclosed in this case are only the preferred embodiments of the present invention, which cannot be used to limit the scope of the rights of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are still covered by the patent application scope of the present invention in.

1‧‧‧Breaking device for circuit breaker

10‧‧‧ circuit breaker

11‧‧‧Current detection device

12‧‧‧Voltage detection device

13‧‧‧ Tripping mechanism

14‧‧‧ circuit breaker closing auxiliary contact

15‧‧‧ Trip coil

16‧‧‧Protection relay normally open contact

17‧‧‧Remote intelligent forced power off command contact

18‧‧‧ Trip circuit power circuit

19‧‧‧Protection relay

20‧‧‧ Power supply automatic alternating circuit

21‧‧‧sensing device connection unit

22‧‧‧External equipment connection unit

23‧‧‧status display unit

24‧‧‧External Support Unit

25‧‧‧External power connection unit

26‧‧‧ Trip circuit connection unit

30‧‧‧Main control board

180‧‧‧ Internal voltage comparison unit

181‧‧‧ First detection circuit

182‧‧‧First display unit

183‧‧‧Microcontroller sequential control unit

184‧‧‧AC-DC conversion circuit

185‧‧‧ DC power alternating circuit

186‧‧‧ Second detection circuit

187‧‧‧Second display unit

188,189‧‧‧B contact

190‧‧‧ capacitor energy storage circuit

191‧‧‧DC power supply parallel output circuit

192‧‧‧The third detection circuit

193‧‧‧ Third display unit

Claims (2)

A circuit breaker tripping device, which is electrically connected to a power circuit, and the power circuit has at least one trip coil for breaking the circuit breaker of the power circuit to link the trip mechanism of the circuit breaker to open The circuit breaker; and at least one voltage detection device provided on the power circuit, the voltage detection device includes a voltage reduction unit for reducing the output voltage; and a current provided on the power circuit A detection device, the current detection device includes a current-reducing unit for reducing the output current; and at least one protection relay provided on the power circuit, the protection relay sets its protection electrical according to the state of the power system circuit Safety setting value of at least one value such as current, ground, voltage, frequency, temperature, etc. When the protection relay is electrically connected to a detection device such as current, ground, voltage, frequency, temperature, etc., the detection When the value of the measuring device is greater than the protection relay setting and the protection electrical safety setting value, the protection relay normally open contact is activated; and the circuit breaker power-off trip device includes: a main control substrate, the main control substrate The electrical connection includes an external power connection unit, an internal voltage comparison unit, a microcontroller sequential control unit, a trip circuit power supply circuit, a capacitor energy storage circuit, a sensing device connection unit, an external device connection unit 1. A trip circuit connection unit and a status display unit; the trip circuit power circuit is electrically connected to the microcontroller sequential control unit, and the appropriate power output is used as trip circuit drive power; the capacitor energy storage circuit is electrically Connect the AC-DC conversion circuit in the trip loop power circuit to store proper DC energy; The external power connection unit electrically connects external AC power and DC power to the main control board; the internal voltage comparison unit electrically connects the external power connection unit, the sensing device connection unit, and the status display unit; the micro The controller sequence control unit electrically connects the external power connection unit, the sensing device connection unit, and the internal voltage comparison unit, and selects an appropriate electrical energy to be electrically connected to the trip loop power circuit through an internal setting sequence; the trip The loop connection unit electrically connects each contact of the external device connection unit in series on the main control board to form a trip circuit, and is electrically connected to the trip circuit power circuit; the sensing device connection unit includes at least the The two or more detection units of the current detection device and the voltage detection device are electrically connected to the protection relay on the power circuit; the external device connection unit includes at least one normally open contact of the protection relay, the The two ends of the circuit breaker's trip coil or the external mandatory command contact; the status display unit can display the status of the system's trip circuit and the status of each power supply; the circuit breaker's power off trip device can be based on the current detection device The current-reducing unit of the output current is mainly the current source electric energy or the voltage-reducing unit of the output voltage of the voltage detection device is the voltage source electric energy. The microcontroller sequential control unit provides trip driving power from the trip circuit power circuit, and forms a complete trip circuit through the trip circuit connection unit. When the circuit breaker is closed and the auxiliary contact is activated, the circuit is driven. The trip coil of the circuit breaker is connected with the trip mechanism of the circuit breaker to open the circuit breaker. A circuit breaker tripping device, It is electrically connected to a power circuit, and the power circuit has at least one trip coil for opening the circuit breaker of the power circuit to link the trip mechanism of the circuit breaker to disconnect the circuit breaker; At least one voltage detection device on the power circuit, the voltage detection device includes a voltage reduction unit for reducing the output voltage; and at least one current detection device provided on the power circuit, the current detection device Contains a current-reducing unit for reducing the output current; and at least one protection relay provided on the power circuit, the protection relay sets at least one of its protection electrical safety settings according to the state of the power system circuit, such as current and ground , Voltage, frequency, temperature, etc., when the protection relay is electrically connected to a detection device such as current, ground, voltage, frequency, temperature, etc., when the value of the detection device is greater than the protection relay setting When the set value of the protection electrical safety is set, the normally open contact of the protection relay is actuated and turned on; and the circuit breaker power-off tripping device includes: a main control substrate, and the main control substrate electrical connection includes an AC-DC conversion circuit , A trip circuit power supply circuit, a capacitor energy storage circuit, a power automatic switching circuit, a sensing device connection unit, an external device connection unit, a status display unit; the AC-DC conversion circuit is electrically connected to the voltage The voltage reduction unit of the detection device, or an external AC energy, converts the AC energy into DC energy, and the capacitor energy storage circuit stores the DC energy; the trip loop power circuit is at least electrically connected to the voltage detection device The voltage-reducing unit, the current-detecting device current-reducing unit or an external support power supply; the capacitor energy storage circuit is electrically connected to the AC-DC conversion circuit in the trip loop power circuit to store appropriate DC energy; The power supply automatic alternating circuit is electrically connected to the trip circuit power circuit, and the capacitor energy storage circuit uses appropriate electrical energy output as trip circuit drive power; the sensing device connection unit at least includes the current detection device and the voltage Two or more detection units of the detection device are electrically connected to the protection relay on the power circuit; the external device connection unit includes at least a normally open contact of the protection relay and a trip coil of the circuit breaker Terminal or the mandatory command contact; the status display unit can display the status of the system trip circuit; the circuit breaker power-off trip improvement device can be based on the current detection device output current of the current reduction unit is the current source energy is The step-down unit of the output voltage of the main or the voltage detection device is the power of the voltage source, which is rectified into DC power, and then the capacitor energy storage circuit stores the DC power or external power, and the tripping drive power is provided through the automatic power alternating circuit and then connected in series Connect the normally open contact of the protection relay, or connect the normally open contact of the protection relay and then connect with the external forced command contact to activate it. When the circuit breaker is closed, the auxiliary contact is activated, and the trip coil of the circuit breaker is driven to Interrupt the circuit breaker tripping mechanism to open the circuit breaker.

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