TWI687014B - Improvement of ac system capacitor tripping device - Google Patents

Abstract

The invention is an improved device for the AC system capacitor tripping device, in particular, in the improvement of the high-voltage power system, when the system is in an accident and the working power of the original tripping circuit is disabled, the effective electric energy cannot be provided to drive the circuit breaker to trip. The coil is actuated to open the circuit breaker to isolate the accident. The improved device of the AC system capacitor tripping device of the present invention uses the electric energy of the voltage source and the current source on the system line as the working power source of the circuit breaker tripping circuit, and can surely make the tripping mechanism of the circuit breaker act to open the circuit breaker. To isolate the accident point and improve the safety of electricity consumption.

Description

Improved device for capacitor tripping device of AC system

The invention is an improved device for the capacitor tripping device of an AC system, especially to improve the high-voltage power system. When an accident occurs in the system, the working power of the original trip circuit is disabled, and an effective power supply cannot be provided to drive the trip of the circuit breaker. Take off the coil to isolate the accident. The improved device for the capacitor tripping device of the AC system of the present invention uses the electric energy introduced by the current detection device as the driving electric energy for driving the tripping coil of the circuit breaker, which can surely force the circuit breaker to make the tripping mechanism of the circuit breaker operate and break the circuit The device is opened to isolate the accident point and improve the safety of electricity.

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 have a high degree of safety and reliability, but in practice the situation of failure of high-voltage power users is often 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 working power supply required for the trip circuit fails, the system is actuated due to lack of electrical energy. The tripping mechanism cannot act to isolate the high-voltage accident, the consequences are quite serious, and the resulting economic losses or even compensation issues are difficult to estimate.

There are three actions for the high-voltage circuit breaker panel, one is energizing and closing ON, the other is power-off and off-off, and the third is tripping trip isolation accident in case of failure. The general command to trip the circuit breaker comes from the protection relay, and the information source of the protection relay generally comes from the CT, to check whether there is an overload or short circuit accident, and the PT to check whether there is overvoltage or low The voltage condition, zero-phase current transformer ZCT checks whether there is a grounding condition, or excessive temperature, abnormal frequency problems, etc., the sensing device provides protection relay operation and conduction, and then the circuit breaker is opened to isolate the accident point . 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 working power of the trip circuit in the system is disabled. At present, in the world's high-voltage power distribution system, the working power of the trip circuit used is generally divided into DC working power and AC working power. The DC working power supply generally uses the battery pack as the working power supply of the trip circuit, and the AC working power supply generally uses the capacitor tripping device CTD as the main source. At present, the tripping methods of high-voltage circuit breakers are generally divided into two types, one is an electric type, uses an internal action coil, and the other is a mechanical trip. The high-voltage power distribution system accident cases are listed as follows: Case 1. The explosion of the Xintianlun Power Plant in Taiwan Radio Station; 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, the CTD failure of the capacitor tripping device caused a 69KV main substation to trip and cause losses; Case IV, a 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 used a capacitor tripping device CTD to protect the relay station. Insufficient capacity caused a secondary accident; Case 6. The UPS failure of the expansion of the Science Park Electronics Factory; Case 7. A hospital in Hualien, high-voltage disk The CTD of the capacitor tripping device was accidentally touched and malfunctioned; Case Eight, Fukushima Nuclear Disaster; Case Nine, Soviet Chernobyl nuclear disaster...etc. In the above case, it is nothing more than when the power supply (distribution) system, the trip circuit of the control power supply in the circuit breaker panel of the power supply is disabled, resulting in the failure of the system because there is no effective working power supply When an accident occurs, it is impossible to make the circuit breaker perform corresponding tripping actions to isolate the accident, and even cause major losses such as a major power outage. It can be seen from the synthesis of these cases that the causes of accidents are nothing more than 1. Natural disasters, 2. Human disasters, and 3. Loss of 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 CB will not operate when an accident occurs, and the business unit cannot be isolated Accident point, causing serious secondary accidents, and even affecting the feeder tripping 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 The capacitor tripping device (CTD) used in digital relays shall not be connected to circuit breakers or other equipment. This is ideal, but accidents often come from ideal conditions. In practice, the uninterruptible power supply system (UPS) is almost always one or two years later. It will malfunction due to battery aging. 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 tripping circuit of the circuit breaker, the working power supply of the protection relay is generally AC and DC can be used to provide the required working power supply. In general, 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 CTD capacitor tripping device dedicated for high voltage electromagnetic switch CTD, the capacitor tripping device CTD supporting DC system, etc., all of these improvements The schemes are designed and manufactured to make the working power of the trip circuit in the high-voltage system safer and more stable.

It can be known from the above that the working power supply of the high-voltage circuit breaker 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. Generally comes from the secondary side of the high-voltage voltage regulator HV PT, because when a short-circuit accident occurs in the high-voltage system, the voltage of the voltage regulator PT drops to zero, resulting in no effective working power supply used in the trip circuit, resulting in the circuit breaker unable to trip To close the contact to isolate the accident, a capacitor tripping device CTD was installed in the AC power supply system as the working power supply for the high voltage disc tripping circuit of the system. Generally speaking, most of the problems can be solved in the case where the working power of the trip circuit is stored in a DC battery pack or a capacitor trip device to store DC power. However, under special circumstances, such as natural disasters such as major earthquakes, or the negligence of human factors, the trip circuit may be damaged or disabled, resulting in the circuit breaker unable to trip to isolate the accident site. For example, because of improper use of equipment, such as the use of a continuous power system UPS, the continuous power system UPS internal battery failure causes the continuous power system UPS to be disabled, resulting in many accident cases. Actual cases such as Longshan Substation are not isolated because of the accident. The blackout in the park. In the case of Taipower’s Xintianlun, due to improper operation of the control power supply and the failure of the circuit breaker to trip to the accident site, the power plant exploded and dozens of people were injured; the Fukushima nuclear power plant in Japan damaged the trip circuit due to the earthquake, and the high-voltage circuit breaker There is no tripping, which leads to the failure of the cooling cycle system, causing nuclear disasters, etc. The above practical cases all illustrate the importance of tripping circuit power and the urgency of improvement. The invention is used to further improve the circuit breaker trip circuit system and improve the stability of the trip circuit power supply system.

Review the reasons why the tripping circuit system in the high-voltage power distribution system will fail. The reasons for the burnout of components such as the voltage comparator PT are: 1. bad environment, excessive moisture, 2. poor insulation of the voltage regulator PT body (Insulation degradation, gaps, etc.), 3. Animal invasion, etc., will cause the burnout of the voltage transformer PT; the reason for the burnout of the current transformer CT is 1. When a short circuit accident occurs in the system When the secondary side is burned, 2. The environment is humid, 3. The insulation is poor, 4. The ground fault...etc., it will cause the CT burner; Generally speaking, the secondary side of the CT should not be open, which will generate high voltage. , And burn the current transformer CT, so the secondary side of the current transformer CT must be connected in series with the load impedance to avoid an open circuit; generally speaking, the secondary side of the voltage comparator PT must not be short-circuited, which will cause excessive fault current and burn the voltage transformer PT Therefore, the secondary side of the voltage regulator PT must be connected in parallel with the load impedance to avoid short circuit. And in the general AC system, the control power supply generally uses the power supply on the secondary side of the voltage regulator PT as the working power source of the trip circuit. On the high-voltage system, the secondary side of the CT is a general current source, which is electrically connected to the counter indicating current and protection relay, and the secondary side of the PT is a general voltage source, which is electrically connected to the counter indicating voltage and protection Relay, according to the electric energy is equal to the voltage multiplied by the current (single-phase), three-phase 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, otherwise When the secondary side short-circuit voltage source of the voltage transformer PT approaches zero, a high current will be generated between the two terminals. Therefore, when the system fails, there will be abnormal state power in the voltage comparator PT or current comparator CT. In addition, the external power supply is disabled, the line is broken or the line is short-circuited, etc., which will affect the working power 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 tripping circuit is disabled, and a great accident occurs accordingly. Therefore, under the existing architecture, the structure of its switchboard, the setting value of its protection relay, the structure of the circuit breaker, etc. cannot be changed. With the invention of the circuit breaker tripping circuit improvement device of the present invention, The function of the original tripping circuit system is enhanced to achieve the safety functionality that could not be protected in the past. 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, an improved device for the circuit breaker tripping circuit system can solve the above problems, and at the same time improve the safety and safety of its power distribution system stability.

An improved device for the capacitor tripping device of the AC system is to strengthen and improve the working power supply device of the conventional trip circuit, in addition to the state with the DC power or the AC power, or the state mixed with the DC and AC, Without changing the protection coordination set by the original system protection relay, without changing the structure of the original switchboard and the state of the high-voltage circuit breaker that has been type-tested, the voltage source and current source are used with the power on the system line Power, connect the internal contacts of the protection relay in series, connect and drive the trip coil of the circuit breaker to form a complete trip circuit system, and drive the internal trip mechanism of the circuit breaker, so that the circuit breaker acts as a power off trip And isolate the accident.

In order to achieve the above object, an improved device for an AC system capacitor tripping device is electrically connected to a power circuit, and the power circuit has at least one tripping coil for opening a circuit breaker of the power circuit to link the disconnection The tripping mechanism of the device disconnects 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 At least one current detection device on the circuit, 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 depends on the power system Line status, 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 When the value of the detection device is greater than the protection relay setting and the protection electrical safety setting value, the protection relay is normally open The contact is actuated; the improved device of the AC system capacitor tripping device includes: a main control board, the main control board electrical connection includes a tripping circuit power supply circuit, a power supply automatic alternating circuit, a capacitor energy storage circuit, a A sensing device connection unit, an external device connection unit, and a status display unit; 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 support power supply The capacitor energy storage circuit, the capacitor energy storage circuit is electrically connected to the trip loop power supply circuit to store appropriate DC energy; the power supply automatically alternates the circuit, and electrically connects the trip loop power supply circuit and the capacitor energy storage circuit Use appropriate electrical energy output as trip circuit driving electrical energy; the sensing device connecting unit, the sensing device connecting unit includes at least two items of the current detecting device and the voltage detecting device; the external device device connecting unit, The external device connection unit at least includes a protection relay conduction contact, both ends of the tripping coil of the circuit breaker or the external forced instruction conduction contact; the status display unit, the status display unit can display the system tripping The status of the loop; the improved device of the AC system capacitor tripping device can be based on the current-reducing unit of the output current of the current detection device as current source power or the voltage-reduction unit of the output voltage of the voltage detection device as voltage source power. It is rectified into DC energy, and then the capacitor energy storage circuit stores the DC energy or external energy, and the tripping drive power is provided by the automatic power alternating circuit, and then the protection relay normally open contact is connected in series, or the protection relay normally open connection Then connect the external compulsory command contact to conduct conduction, and when the circuit breaker closes the auxiliary contact to conduct conduction, drive the trip coil of the circuit breaker to link the circuit breaker trip mechanism to open the circuit breaker.

To achieve the above object, an improved device for an AC system capacitor trip 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 Tripping mechanism to open the circuit breaker; and at least one voltage detection device provided on the power circuit, the voltage detection device includes a A voltage-reducing unit; and at least one current detection device provided on the power circuit, the current detection device includes a current-reducing unit for reducing the output current; and at least one device provided on the power circuit Only protect the relay. The protection relay sets at least one of its protection electrical safety settings such as current, ground, voltage, frequency, temperature, etc. according to the state of the power system circuit. 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 set its protection electrical safety setting value, the protection relay normally open contact is activated; the AC system capacitor trip device The improved 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, a status display unit; the AC/DC conversion circuit, the AC/DC conversion circuit is electrically connected to the voltage reduction unit of the voltage detection device, or an external AC power to convert the AC power into DC power, and DC energy is stored by the capacitor energy storage circuit; 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 support power supply; the capacitor energy storage circuit, The capacitor energy storage circuit is electrically connected to the trip loop power supply circuit to store appropriate DC energy; the power supply automatically alternates the circuit, electrically connects to the trip loop power supply circuit and the capacitor energy storage circuit uses appropriate energy output as Tripping circuit driving power; the sensing device connecting unit, the sensing device connecting unit includes at least two items of the current detection device and the voltage detecting device; the external device connecting unit, the external device connecting unit at least Contains a protection relay conduction contact, both ends of the tripping coil of the circuit breaker or the external forced instruction conduction contact; the status display unit, the display unit can display the status of the system trip circuit; the AC system capacitance The improved device of the tripping device may be based on that the current-reducing unit of the output current of the current detecting device is the current source power or the voltage-reducing unit of the output voltage of the voltage detecting device is the electricity The voltage source power is rectified into DC power, and then the capacitor energy storage circuit stores the DC power or external power. The automatic power supply circuit provides tripping drive power and then connects the normally open contact of the protection relay, or the protection. The normally open contact of the relay is connected in parallel with the external compulsory command contact to conduct conduction. When the circuit breaker is closed and the auxiliary contact is activated, the trip coil of the circuit breaker is driven to link the circuit breaker trip mechanism to open the circuit breaker.

1: Improved device for AC system capacitor tripping 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: External mandatory 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: DC external support unit

25: AC external support unit

28: control loop power supply

30: Main control board

180: Second AC-DC conversion circuit

181: The first detection circuit

182: The first display unit

183: Simulated fault occurrence circuit

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 improved device wiring of AC system capacitor tripping device

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

Fig. 3 Schematic diagram of tripping circuit protection action of tripping circuit system

Figure 4 Architecture diagram of the first embodiment of the improved device of the AC system capacitor tripping device

Figure 5 Architecture diagram of the second embodiment of the improved device of the AC system capacitor tripping device

The preferred embodiment of the improved device for the capacitor tripping device of the AC system of the present invention, as shown in FIG. 1, is provided with a circuit breaker 10 on the power circuit, the circuit breaker 10 has a tripping coil 15 and the tripping coil 15 The trip mechanism 13 of the circuit breaker 10 is linked with it; a voltage detection device 12 (such as a voltage comparator) is provided on the power circuit. The voltage detection device 12 includes a voltage reduction unit for reducing the output voltage; the voltage reduction The unit is electrically connected to the protection relay 19 and the control circuit power supply 28. 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 control The loop power supply 28, the control loop power supply 28 selects the corresponding electrical energy to be connected in series to the protection relay 19 via the power automatic switching 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.

For different types of external support power, the AC system capacitor trip device The design of the improved device is slightly different. In the present invention, two embodiments of the DC and AC external support power sources are described. Components or blocks with the same function in the illustration are marked with the same number. As shown in FIG. 4, which is a functional block diagram of the first embodiment of the present invention, the AC system capacitor tripping device improvement device 1 has a DC input terminal connected to a DC external support unit 24 and a voltage reduction device connected to a voltage detection device 12 The AC input of the unit. The DC 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 connected to the AC input terminal, and is converted into a DC power supply through an AC/DC conversion circuit 184. The AC/DC conversion circuit 184 is generally a bridge rectifier filter. The power output from the DC external support unit 24 is also connected to the DC power alternating circuit 185. The DC power alternating circuit 185, when the step-down unit of the voltage detecting device 12 is powered, prefers the DC of the AC conversion circuit 184 The output of the power supply is 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 supply alternating circuit 185 selects the power supply of the DC 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 power supply circuit 185 (that is, the output power of the capacitor energy storage circuit 190) and the power supply of the DC external support unit 24 are simultaneously input to the parallel output circuit 191 of the DC power supply, and the DC power supply is paralleled to the output circuit 191 and energy is stored by the capacitor The electrical energy of the circuit 190 is used as a priority to provide 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 DC 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, seven Segment 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 Whether it is higher than a preset value for necessary warnings.

As shown in the circuit diagram of the current detection device (current converter) shown in FIG. 2, the side branch path and the output of the DC power parallel output circuit 191 are connected to the power automatic switching circuit 20, and the power automatic alternating circuit 20 is preferably selected from DC When the power supply of the parallel output circuit 191 of the power supply and the power supply of the parallel output circuit 191 of the DC power supply are disabled, they are switched to the side branch path of the current-reducing unit of the current detection device 11, and the normally open contact 16 of the protection relay is turned on, and the circuit breaker The closing auxiliary contact 14 is also turned on, and the current of the current 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 automatic power supply switching circuit 20 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 generating circuit 183 in FIG. 4 is used to conveniently test the working state of the trip loop power circuit 18. The other mandatory command contact 17 can accept external commands from the remote end to control the trip coil 15 of the circuit breaker 10.

Referring again to FIG. 5, which is a functional block diagram of a second embodiment of the present invention, the AC system capacitor tripping device improvement device 1 has an AC input terminal connected to an AC external support unit 25 and a voltage reduction unit connected to a voltage detection device 12 AC input. The AC external support unit 25 is, for example, an uninterruptible power system UPS, and can be used as one of the power sources required for the tripping operation of the circuit breaker 10. It is converted into a DC power supply via a second AC-DC conversion circuit 180, and the second AC-DC conversion circuit 180 is generally a bridge rectifier filter. The step-down unit of the voltage detection device 12 is connected to the AC input terminal, and is converted into a DC power supply through a DC conversion circuit 184. The AC conversion circuit 184 is generally a bridge rectifier filter. This converted DC power supply is from the second The power output of the DC conversion circuit 180 is also connected to the DC power alternating circuit 185. The DC power alternate circuit 185 preferably uses the DC power output of the AC conversion circuit 184 when the step-down unit of the voltage detection device 12 is energized. In this way, the capacitor energy storage circuit 190 is charged, and the capacitor is used to store the electric energy required for the trip circuit. Such as voltage detection equipment When the step-down unit 12 is disabled, the DC power alternating circuit 185 selects the power output 180 of the second AC-DC conversion circuit rectified by the AC external support unit 25 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 power supply circuit 185 (that is, the output power of the capacitor energy storage circuit 190) and the output power of the second AC/DC conversion circuit 180 are simultaneously input to the DC power parallel output circuit 191, and the DC power parallel output circuit 191 is combined with The electric energy of the capacitor energy storage circuit 190 is used as a priority to provide the power required for the trip 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 second AC/DC conversion circuit 180, 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 a meter , Seven-segment 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.

As shown in the circuit diagram of the current detection device (current converter) shown in FIG. 2, the side branch path and the output of the DC power parallel output circuit 191 are connected to the power automatic switching circuit 20, and the power automatic alternating circuit 20 is preferably selected from DC When the power supply of the parallel output circuit 191 of the power supply and the power supply of the parallel output circuit 191 of the DC power supply are disabled, they are switched to the side branch path of the current-reducing unit of the current detection device. At this time, the normally open contact 16 of the protection relay is turned on and the circuit breaker is closed The auxiliary contact 14 is also turned on, and the current of the current 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 automatic power supply switching circuit 20 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 generating circuit 183 in FIG. 4 is used to conveniently test the working state of the trip loop power circuit 18. The other mandatory command contact 17 can accept external commands from the remote end to control the trip coil 15 of the circuit breaker 10.

At the same time, the first and second embodiments of the improved device 1 of the AC system capacitor tripping device of the present invention are to facilitate the operation of the test trip circuit power supply, and are provided with an analog fault generating circuit 183, which can be a test button or connected to the micro The trigger cut-off signal of the controller can individually disconnect the connection state connected to the parallel output circuit of the DC power supply. The cut-off switch B contacts 188 and 189 can be a relay module with a closed contact or a switching mode with the same function. Group reached (not shown).

In addition, the first and second embodiments of the improved device 1 of the AC system capacitor tripping device of the present invention are for facilitating remote monitoring of the status of each backup power supply, and are provided with a contact 17 for accepting external mandatory commands to facilitate remote testing. Remote control can be achieved, for example, through a serial communication module (such as RS485, RS422, or RS232 communication ports). The serial communication module is preferably combined with a microcontroller interface to execute the transmission and reception of signals or control commands.

In summary, the improved device of the AC system capacitor tripping device of the present invention further improves the stability of the circuit breaker tripping circuit system, has deep industrial applicability, and checks related products and approved patent announcements on the market It has not seen the same technical features as the essence of the present invention, but also meets 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‧‧‧Improved device for AC system capacitor tripping device

10‧‧‧ circuit breaker

11‧‧‧Current detection device

12‧‧‧Voltage detection device

15‧‧‧ Trip coil

16‧‧‧Protection relay normally open contact

17‧‧‧External mandatory 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‧‧‧IC external support unit

30‧‧‧Main control board

181‧‧‧ First detection circuit

182‧‧‧First display unit

183‧‧‧Simulation fault generating circuit

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)

An improved device for an AC system capacitor trip device, which is electrically connected to a power circuit, and the power circuit has at least one trip coil for opening a circuit breaker of the power circuit to link the trip mechanism of the circuit breaker 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 at least one device provided on the power circuit 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 sets its protection according to the state of the power system circuit The electrical safety setting value is at least one value such as current, ground, voltage, frequency, temperature, etc., when the protective 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 and the protection electrical safety setting value, the protection relay normally open contact actuates conduction; the AC system capacitor tripping device improvement device includes: a main control substrate, the main control The electrical connection of the substrate includes a trip circuit power 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 trip circuit power circuit, At least electrically connected to the voltage detection device voltage reduction unit, the current detection device current reduction unit or an external support power supply; the capacitor energy storage circuit is electrically connected to the trip loop power supply circuit to store appropriate DC energy; the power supply Automatic alternating circuit, which is electrically connected to the trip loop power circuit and the capacitor energy storage circuit, and uses appropriate electrical energy output as trip loop drive electrical energy; The sensing device connection unit includes at least two of the current detection device and the voltage detection device; the external device connection unit includes at least one of the normally open contact of the protection relay and the trip coil of the circuit breaker The two ends or the external mandatory command contact; the status display unit can display the status of the system trip circuit; the improved device of the AC system capacitor trip device can use the current reduction unit of the current detection device output current as the current source The electric energy is the main or the output voltage of the voltage detection device. The step-down unit is the voltage source electric energy, which is rectified into DC electric energy, and then the capacitor energy storage circuit stores the DC electric energy or external electric energy, and provides tripping through the power automatic switching circuit. The 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 the circuit breaker, and when the auxiliary contact of the circuit breaker is closed, the circuit breaker is driven. Of the trip coil to link the circuit breaker trip mechanism to open the circuit breaker. An improved device for an AC system capacitor trip device, which is electrically connected to a power circuit, and the power circuit has at least one trip coil for opening a circuit breaker of the power circuit to link the trip mechanism of the circuit breaker 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 at least one device provided on the power circuit 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 sets its protection according to the state of the power system circuit The electrical safety setting value is at least one value such as current, ground, voltage, frequency, temperature, etc. When the protective relay is electrically connected to the detection device such as current, ground, voltage, Frequency, temperature, etc. detection device, when the value of the detection device is greater than the protection relay set its protection electrical safety setting value, the protection relay normally open contact is activated; the AC system capacitor tripping device improvement device , Including: 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 Equipment unit connection unit, 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 convert AC power to DC power, and The capacitor energy storage circuit stores DC electrical energy; the trip loop power circuit is at least electrically connected to the voltage detection device buck unit, the current detection device current reduction unit or an external support power source; the capacitor energy storage circuit is electrically Connect the trip loop power supply circuit to store appropriate DC energy; the power supply automatically alternates the circuit, electrically connects the trip loop power supply circuit and the capacitor energy storage circuit with proper power output as trip loop drive power; the The connection unit of the sensing device includes at least two of the current detection device and the voltage detection device; the connection device of the external device device includes at least one normally open contact of the protection relay, two ends of the trip coil of the circuit breaker or The external mandatory command contact; the status display unit can display the status of the system tripping circuit; the improved device of the AC system capacitor tripping device can be based on the output current of the current detection device. Or the step-down unit of the output voltage of the voltage detection device is the voltage source electric energy, which is rectified into DC electric energy, and then the capacitor energy storage circuit stores the DC electric energy or The external power supply provides tripping drive power through the automatic power supply alternate circuit, and then connects the normally open contact of the protection relay in series, or connects the normally open contact of the protection relay in parallel with the external forced command contact to conduct conduction, and the circuit breaker When the auxiliary contact is closed and activated, the trip coil of the circuit breaker is driven to link the trip mechanism of the circuit breaker to open the circuit breaker.

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