TWI690965B - Self-strength trip circuit breaker tripping loop improvement device - Google Patents

Abstract

The invention is an Self-strength trip circuit breaker tripping loop improvement device, in particular, in an improved high-voltage power system, when an accident occurs in the system, the working power supply of the original tripping circuit is disabled, and the effective power-driven circuit breaker cannot be provided to take off the coil to isolate the accident. The improved circuit breaker circuit system of the present invention introduces the current of the secondary side of the current transformer as the power required for the circuit breaker to trip the coil, and combines with storage capacitor to guarantee enough power source can surely make the circuit breaker tripping in the event of a system failure. The tripping mechanism acts to open the circuit breaker, isolate the accident point, and improve the safety of power system.

Description

Equipped with improved device for tripping circuit of self-tripping circuit breaker

The invention is an improved device with a self-operated trip circuit breaker, especially to improve the high-voltage power system. When an accident occurs in the system, its original trip circuit power supply is disabled, and an effective power supply cannot be provided to drive the circuit breaker. Of the trip coil to isolate the accident. The improved device of the present invention is equipped with a trip circuit for a self-tripping circuit breaker. The electrical energy of the current-reducing unit of the current detection device is used as the electrical energy for the circuit breaker trip coil, and the current source capacitor is added to the current source system to charge and discharge energy storage The circuit can ensure that in the event of a non-short circuit accident, when the original trip circuit power supply is disabled, when the protection relay normally open contact is activated or the remote intelligent forced power off command contact is turned on, it can be confirmed when the system fails Force the circuit breaker to make the tripping mechanism of the circuit breaker operate, open the circuit breaker, isolate the accident point, and improve the safety of electricity consumption.

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, the situation of high-voltage power users' failures 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 the high-pressure system In the system, the power supply components of the trip circuit which can safely isolate the accident by the system have indeed become a dead end in safety. When the working power supply required by the trip circuit fails, the system is actuated due to lack of electrical energy, and the trip mechanism cannot operate 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 accidents 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, a CTD failure dedicated to the protective relay in the high-voltage disk, which caused the Taipower substation to trip; Case 3. In a chemical plant in Hsinchu Industrial Zone, a CTD failure caused a 69KV main substation to trip and cause losses; Case 4. A CTD failure in a chemical fiber factory in Fangyuan Industrial Zone caused a 69KV substation to trip and all semi-finished products were destroyed; Case 5. An Indonesian factory protects the relay With CTD, insufficient capacity caused a second accident; Case VI. Failure of the expansion of the UPS in the Science Park Electronics Factory; Case VI. In a hospital in Hualien, the CTD of the high-voltage disk was accidentally touched and malfunctioned; case eight, the Fukushima nuclear disaster in Japan; case nine, the Chernobyl nuclear disaster in the Soviet Union, 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.

High voltage circuit breaker (H.V.CB) or extra high voltage CGIS or GIS, is to accept the protection relay (Relay) instruction, as a trip to 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 CB will not operate when an accident occurs, and the accident of the business unit cannot be isolated 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) will almost always be affected by power after one or two years. The pool is aging and malfunctioning. 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 CTD of the automatic power conversion circuit to prevent the failure of the capacitor tripping device. 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 The program is a product 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, due to improper use of equipment, such as the use of UPS, UPS disabling due to internal battery failure caused many accidents. Actual cases such as the Longshan Substation failed to isolate and caused a major power outage in the science park. In the case of Taipower’s Xintianlun, due to improper operation of the control power supply and failure of the working power supply of the trip circuit, 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 did not trip Disconnection, leading to the failure of the cooling cycle system, causing nuclear disasters, etc. The above practical cases all illustrate the importance of the working power of the trip circuit 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, the secondary side causes Burned, 2. humid environment, 3. poor insulation, 4. ground fault, etc.; The CT of the current transformer is burned; generally speaking, the secondary side of the CT should not be opened to generate high voltage, and the CT of the current transformer is burned, so the load impedance must be connected in series on the secondary side of the CT to avoid an open circuit; generally speaking, the specific voltage The secondary side of the voltage transformer PT must not be short-circuited, which will generate excessive fault current and burn the voltage transformer PT. Therefore, the secondary side of the voltage transformer 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. Just like the electrical characteristics of a voltage-reduction unit using a voltage detection device, when a short-circuit accident occurs on the system, the voltage across the voltage-reduction unit of the voltage detection device suddenly drops to zero potential, which will cause the power of the circuit to be disabled. An appropriate voltage source cannot be provided, and when an accident occurs, it cannot isolate the accident and cause disaster. Similarly, when using the current source of the power circuit, under the normal state, when the current-reducing unit of the current detection device is normal, there are about two kinds of current amperage. The general current detection device is commonly known as a current meter. The current-reducing unit is rated at 5A and 1A. When the current-reducing unit is rated at 5A, the normal current flowing through the loop is 1.5A to 2A. At present, due to the progress of technology, the function of the protection relay is improved, and the energy consumption Lowering, regardless of the accuracy of the setting, the 1A rating of the current-reducing unit is also widely used in many power circuit systems. When the current-reducing unit is rated at 1A, the normal current flowing through the circuit is 0.4A to 0.6 A, such current source power is not enough to drive The tripping coil inside the circuit breaker, the internal tripping coil energy of the general circuit breaker drives the tripping mechanism inside the circuit breaker, its current can be at least about 3.2A to 4A, with a conservative and reliable working current source, generally set to 5A, That is, when a current source is used as the working power supply for the circuit breaker tripping circuit, only 5A is required to actually drive the tripping coil and the tripping mechanism to open the closed contact of the circuit breaker to isolate the accident. It can be seen from the above description that when the current source is connected to the voltage source and the external working power supply, when the disaster occurs on the day, when all the working electrical energy is disabled, then only the power circuit is short-circuit accident or continuous accident or lack of Equivalent, in the power circuit, the current-reducing unit of the current detection device will have a very large current source (generally the fault current is 10 times or 20 times the rated current), when the system occurs due to excessive temperature, frequency, direction, reverse Phase, phase balance, phase sequence, power factor, magnetic field, current balance point, differential, pressure, etc., in the power circuit system, in the case of non-short circuit and ground faults and under-equal, the power circuit current detection device The current unit of the current unit will not exceed 5A. Generally, when an accident such as overload, temperature, frequency, etc. occurs, the protection relay often opens the contact, but because the current source of the line does not reach 3.5A to 4A, it is not enough to promote The electric energy of the tripping coil, so when the accident occurs, the above fault cannot be protected, prompting the circuit breaker to open and close the joint to isolate the accident. In order to solve the above problems, the current source circuit must be improved to meet the needs of the actual circuit, so that it can cope with the power system under all conditions. When the accident occurs, the current source circuit can have enough Electrical energy drives the trip circuit, so there is a practical need for an improved device for a trip circuit with a self-acting trip circuit breaker.

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 therefore a great accident occurs. Therefore, under the existing structure, it is impossible to change the structure of its switchboard, the set value of its protection relay, the structure of the circuit breaker... etc., and seek a more stable circuit breaker power-off tripping system design Design, ensuring the safety and stability of the power distribution system has always been the goal of the inventors. As shown in the first figure, it is the inventor's previous initiative to introduce the electric energy of the current detection device (such as a current limiter) current reduction unit as the electric energy required for the circuit breaker tripping system. The advantage is that when the power supply of the circuit breaker tripping system (such as the battery, capacitor tripping device, or power supply of the uninterruptible power system) is disabled, the circuit breaker tripping mechanism cannot be operated to cut off the circuit breaker, which will cause huge losses. . However, because a large current still flows on the power circuit, this flowing current can be introduced into the trip coil through the current-reducing unit of the current detection device, and then the trip mechanism can be actuated to open the circuit breaker to isolate the accident point.

The operation principle of the electric current introduction device of the current detection device 11 to drive the trip mechanism 13 of the circuit breaker 10 can be seen in FIG. 2. As shown in the shaded box in FIG. 2, it is a schematic diagram of an equivalent circuit of a general current detection device 11 (such as a 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 detecting device 11 (such as a current transformer) as the driving power supply for the tripping coil 15 of the circuit breaker 10, the current-reducing unit of the current detecting device 11 is connected in parallel to a branch path. When this side branch path is normal, the protection relay 19 is not activated, the internal protection relay normally open contact 16 is open, and the circuit breaker closing auxiliary contact 14 of the circuit breaker 10 is in the conductive state. No current flows through the side branch path. 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, and thus can be used as the electrical energy required for the circuit breaker 10 to trip the coil 15 and drive.

In the previous invention, it is mainly based on the premise that a large current flows on the power circuit in the event of a system failure, and therefore the current of the current lowering unit is large enough to drive the trip coil 15. But system failure is not just a kind of large current, for example, abnormality of frequency or temperature is also a cause of power system Barrier, but not necessarily a large current flows through the power circuit. At this time, if the power supply required by the tripping mechanism 13 is disabled (such as a battery, a capacitor tripping device, or an uninterruptible power system), the current of the current-reducing unit of the current detection device 11 is not large enough to drive the tripping coil 15, It will also lead to economic losses. The main objective of the present invention is how to ensure that the electric energy introduced into the current-reducing unit of the current detection device 11 when various fault types are generated, enough to drive the trip coil 15 to activate the trip mechanism 13 to isolate the accident point. With the improved device 1 of the self-operated tripping circuit breaker tripping circuit of the present invention, the function of the prior art is enhanced, and the tripping circuit has sufficient electrical energy under various types of faults to achieve the safety functionality that cannot be protected in the past, Improve the safety and stability of its power distribution system.

An improved device for a trip circuit with a self-acting trip circuit breaker is to strengthen and improve the working power supply device of a conventional trip circuit, except that it retains the state of existing DC power or AC power, or a mixture of DC and AC In addition to the state, without changing the protection coordination mechanism set by the original system protection relay, without changing the structure of the original switchboard, and without changing the state of the high-voltage circuit breaker that has been type-tested, the current-reduction unit of the current detection device is introduced. Electrical energy, and like the protection mechanism of the voltage source, in addition to the current source directly supporting the control loop power supply, and also adding a current source capacitor energy storage charging and discharging circuit to support the trip circuit working power supply in the high voltage distribution system Electrical energy, using the power of the voltage source and current source at the same time, connect the normally open contact action of the protection relay in series, connect the auxiliary contact of the series circuit breaker, and then connect the trip coil of the drive circuit breaker in series to form a complete trip circuit The system also drives the internal trip mechanism of the circuit breaker to make the circuit breaker actuate to trip and isolate the accident. Equipped with an improved device for self-tripping circuit breaker tripping circuit, it can solve the problem when the power of the voltage source in the power circuit is disabled and the external power supply is also disabled. To protect relays such as temperature, frequency, etc., the electric energy of the current source is not enough to push the tripping coil of the circuit breaker, which cannot isolate the fault problem, and the problem of disconnecting the circuit breaker to isolate the accident point is The source energy is added to the current source capacitor energy storage charge and discharge circuit, which can achieve the effect of adjusting the trip time, so that the protection coordination protection mechanism on the power system is more perfect.

In order to achieve the above object, a tripping circuit improvement device with a self-acting tripping circuit breaker is electrically connected, a power circuit having 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; a voltage detection device provided on the power circuit at least one, the voltage detection device includes a voltage reduction unit for reducing the output voltage; One current detection device, which includes a current-reducing unit for reducing the output current; one at least one protection relay provided on the power circuit, the protection relay depends on the power system circuit and load status To meet the requirements of protection coordination, set at least one of its protection electrical safety settings such as current, ground, voltage, frequency, temperature, etc. When the value of the detection device is greater than the electrical safety setting, the normally open contact of the protection relay is activated The improved device with a tripping circuit for a self-tripping circuit breaker includes: a merging circuit for a current-reducing unit, the merging circuit for the current-reducing unit is electrically connected to a current-reducing unit of at least one current detection device provided on the power circuit, Rectified and converted into current source DC energy, the current of the output energy is added, and electrically connected to a current source capacitor energy storage charging and discharging circuit, a control loop power supply; a current source capacitor energy storage charging and discharging circuit, the current source capacitor The energy storage charge/discharge circuit is electrically connected to the confluence circuit of the current-reducing unit. The current source capacitor energy storage charge/discharge circuit is connected in series with the normally open contact of the protection relay or the normally open contact of the protection relay and connected to the remote intelligent forced disconnection Electrical command contact, then connect the normally open contact of the circuit breaker, and then connect an energy storage capacitor in series to form a complete current source. The capacitor energy storage charging and discharging circuit supplies the current source DC power to the control loop power supply; a control loop power supply, the control loop power supply is electrically connected to a current-reducing unit junction circuit, a current source capacitor energy storage charging and discharging circuit, a protection relay normally open contact, or a remote intelligent Compulsory power-off command contact; this device is equipped with an improved circuit breaker for tripping circuit breakers, which uses the current source of the current detection device as the main working energy, and the DC energy of the confluence circuit of the current-reducing unit and the capacitor energy storage charging and discharging circuit of the current source It is electrically connected to the control circuit power supply, and the control circuit power supply is then connected in series with the protection relay normally open contact or remote intelligent forced power off command contact, and then the circuit breaker's trip coil is connected in series to form a trip Circuit, when 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 circuit breaker trips the coil to control the circuit power supply or current detection device The electrical energy is activated to drive the trip mechanism of the circuit breaker to open the circuit breaker.

In order to achieve the above object, a tripping circuit improvement device with a self-acting tripping circuit breaker is electrically connected, a power circuit having 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; a voltage detection device provided on the power circuit at least one, the voltage detection device includes a voltage reduction unit for reducing the output voltage; One current detection device, which includes a current-reducing unit for reducing the output current; one at least one protection relay provided on the power circuit, the protection relay depends on the power system circuit and load status To meet the requirements of protection coordination, set at least one of its protection electrical safety settings such as current, ground, voltage, frequency, temperature, etc. When the value of the detection device is greater than the electrical safety setting, the normally open contact of the protection relay is activated The improved device with a self-tripping circuit breaker tripping circuit includes: a current-reducing unit merging circuit, the current source DC power unit current-reducing unit merging circuit is electrically connected to at least one current detection device provided on the power circuit The current-reducing unit is converted into current source DC energy through rectification, and its output power The sum of the energy currents; a control loop power supply, which is electrically connected to a confluence circuit of the current-reducing unit, which can be connected to the AC and DC power of the voltage source, a normally open contact of the protection relay, or a remote intelligent forced power off Command contact; the improved device with self-tripping circuit breaker tripping circuit, which is mainly based on the current source of the current detection device, and the current-reducing unit of the current detection device is converted into DC power by a rectifier unit, and the DC power The electrical connection bus becomes the merging circuit of the current-down unit, and then is electrically connected to the control circuit power supply, and the control circuit power supply is then connected in series with the protection relay normally open contact or remote intelligent forced power off command contact, and then connected in series The trip coil of the circuit breaker is connected in series to form a trip circuit. When the normally open contact of the protection relay or the remote intelligent forced power off command contact is turned on, when the circuit breaker is closed and the auxiliary contact is activated, the circuit breaker The trip coil is operated by the electrical energy of the control loop power supply or the current detection device to drive the trip mechanism of the circuit breaker to open the circuit breaker.

1‧‧‧Equipped with improved device for tripping circuit of self-tripping 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‧‧‧Control circuit power supply

19‧‧‧Protection relay

20‧‧‧ Power supply automatic alternating circuit

30‧‧‧Energy storage circuit

31‧‧‧Combination circuit of down-flow unit

32‧‧‧Current source capacitor energy storage charging and discharging circuit

33‧‧‧Energy storage capacitor

Figure 1 Schematic diagram of the conventional circuit breaker power-off tripping system device wiring

Figure 2 Schematic diagram of Xi current detection device (current ratio)

Figure 3 The present invention is equipped with a circuit breaker schematic diagram of an embodiment of a self-powered trip circuit breaker trip circuit improvement device

4 is a schematic diagram of the device wiring of the second embodiment of the improved device of the present invention equipped with a trip circuit breaker

The present invention includes an improved device 1 for a trip circuit of a self-tripping circuit breaker. A preferred embodiment of the first embodiment is shown in FIG. 3 (the same components use the same number as in FIG. 1), and a circuit breaker 10 is provided on the power circuit The circuit breaker 10 has a tripping coil 15 which links 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 to detect the voltage The device 12 includes a buck unit for reducing the output voltage; the buck unit is electrically connected to the protection relay 19 and the control loop power supply 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 It is connected to the current source capacitor energy storage charging/discharging circuit 32 and the control circuit power supply 18 through the current sink unit merge circuit 31. The merging circuit 31 of the current lowering unit adds the output currents of the current lowering units of at least one group of current detecting devices 11 (the bottom right of FIG. 3 shows three groups of current detecting devices) to limit the direction of current flow with the diode . The current source capacitor energy storage charging and discharging circuit 32 is a protection relay 19 that acts when a system failure occurs. The protection relay normally open contact 16 is turned on and the circuit breaker closing auxiliary contact 14 is also turned on. At this time, the current source capacitor storage Only when the charge-discharge circuit 32 is turned on can the energy storage capacitor 33 be charged. That is, when a fault occurs, the current-sense device 11 current-dropping unit instantly charges the energy storage capacitor 33, and then connects the current from the current-sense device current-sinking unit junction circuit 31 to the control loop power supply 18, thereby improving the drive The power required for the trip coil 15 to drive. The remote intelligent forced power off command contact 17 can receive control commands from the remote end to drive the remote operation of whether the circuit breaker 10 trips. The control circuit power supply 18 selects the corresponding electrical energy in series with the protection relay 19 via the power supply automatic alternating 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 remote 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), the electrical energy of the energy storage capacitor 33 and the electrical energy of the voltage detection device 12 (such as a voltage regulator) can be introduced to further improve the disconnection when an accident occurs The trip coil 15 of the device 10 has enough electric energy to drive to isolate the accident.

Combining the technical features of the current detection device 11 (such as a current transformer) current-reduction unit of the present invention with the energy storage circuit 30 and the design of the conventional circuit breaker 10 to trip the power supply, please refer to FIG. 4. The shaded square in the upper left of Figure 4 indicates that in the conventional technique, the battery pack BAT, the capacitor trip device CTD or the uninterruptible power system UPS is used as the trip power supply of the circuit breaker 10 and the trip coil 15, 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 lowering unit and the energy storage circuit 30 introduced into the current detection device 11 (such as a current transformer) are integrated, as can be seen from FIG. 4, when the system fails (the protection relay normally open contact 16 is turned on) ), if the battery pack, capacitor tripping 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 transformer) drops. The current source of the flow unit still has current flowing (see figure 2). At this time, the automatic power supply switching circuit 20 is switched to the energy storage circuit 30 of the current lowering unit of the current detection device 11 due to the failure of the conventional battery pack, capacitor tripping device or uninterruptible power system. Arrows flow into the trip coil 15 of the circuit breaker 10 to drive the trip mechanism 13 to operate. Therefore, the closed main contact of the circuit breaker 10 can be cut to isolate the accident point, which further improves the stability of the circuit breaker tripping circuit system to ensure the safety of the power system operation.

In summary, the present invention is provided with an improved device for tripping the circuit of a self-tripping circuit breaker It has further improved the stability of the circuit breaker tripping circuit system, and has deep industrial utility. Moreover, the relevant products on the market and the approved patent announcements did not see the same technical features as the essence of the present invention, but also met the new 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‧‧‧Equipped with improved device for tripping circuit of self-tripping 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‧‧‧Control circuit power supply

19‧‧‧Protection relay

20‧‧‧ Power supply automatic alternating circuit

30‧‧‧Energy storage circuit

31‧‧‧Combination circuit of down-flow unit

32‧‧‧Current source capacitor energy storage charging and discharging circuit

33‧‧‧Energy storage capacitor

Claims (2)

An improved device with a self-operated trip circuit breaker trip circuit is electrically connected: a power circuit with at least one trip coil for breaking the circuit breaker of the power circuit to link the trip mechanism of the circuit breaker Open the circuit breaker; a voltage detection device provided on at least one of the power circuits, the voltage detection device including a step-down unit for reducing the output voltage; a current detection device provided on at least one of the power circuits Testing device, the current detection device includes a current-reducing unit for reducing the output current; at least one protection relay provided on the power circuit, the protection relay according to the power system circuit, load status and protection coordination requirements, Set at least one of its protection electrical safety settings such as current, ground, voltage, frequency, temperature, etc. When the value of the detection device is greater than the electrical safety setting, the normally open contact of the protection relay will be activated; The improved device for tripping circuit of tripping circuit breaker includes: a merging circuit of a current-reducing unit, the merging circuit of the current-reducing unit is electrically connected to a current-reducing unit of at least one current detection device provided on the power circuit, and is converted into a current source through rectification DC energy, the current of the output energy is added, and is electrically connected to a current source capacitor energy storage charging and discharging circuit, a control loop power supply; a current source capacitor energy storage charging and discharging circuit, the current source capacitor energy storage charging and discharging circuit It is electrically connected to the merging circuit of the current-down unit. The current source capacitor energy storage charging and discharging circuit is connected in series with the protection relay normally open contact or the series protection relay normally open contact and connected with the remote intelligent forced power off command contact. Connect the normally open contact of the circuit breaker in series, and then connect an energy storage capacitor in series to form a complete current source capacitor energy storage charging and discharging circuit to supply the current source DC energy to the control circuit power supply; A control loop power supply, the control loop power supply is electrically connected to a current-reducing unit junction circuit, a current source capacitor energy storage charging and discharging circuit, a protection relay normally open contact, or a remote intelligent forced power off command contact; The improved device with a self-tripping circuit breaker tripping circuit uses the current source of the current detection device as the main working energy, and the DC energy of the confluence circuit of the current reducing unit and the current source capacitor energy storage charging and discharging circuit is electrically connected to the control circuit power supply , The control circuit power supply is then connected in series with the protection relay normally open contact or remote intelligent forced power off command contact, and then the circuit breaker's trip coil is connected in series to form a trip circuit, the protection relay is often When the 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 tripping coil of the circuit breaker is actuated by the power of the control loop power supply or current detection device to drive the The trip mechanism of the circuit breaker to open the circuit breaker. An improved device with a self-operated trip circuit breaker trip circuit is electrically connected: a power circuit with at least one trip coil for breaking the circuit breaker of the power circuit to link the trip mechanism of the circuit breaker Open the circuit breaker; a voltage detection device provided on at least one of the power circuits, the voltage detection device including a step-down unit for reducing the output voltage; a current detection device provided on at least one of the power circuits Testing device, the current detection device includes a current-reducing unit for reducing the output current; at least one protection relay provided on the power circuit, the protection relay according to the power system circuit, load status and protection coordination requirements, Set at least one of its protection electrical safety settings such as current, ground, voltage, frequency, temperature, etc. When the value of the detection device is greater than the electrical safety setting, the normally open contact of the protection relay will be activated; The improved device with self-powered trip circuit breaker tripping circuit includes: a current-dropping unit merging circuit, the current source DC electric energy unit current-dropping unit merging circuit is electrically connected to a drop of at least one current detection device provided on the power circuit The current unit is rectified and converted into current source DC energy, and the current of the output energy is added; a control loop power supply, the control loop power supply is electrically connected to a current-drop unit junction circuit, a protection relay normally open contact, or a Remote intelligent forced power-off command contact; the improved device with self-tripping circuit breaker tripping circuit is mainly based on the current source of the current detection device, and the current-reducing unit of the current detection device is converted into a DC power, the DC power is electrically connected and condensed to form a convergent circuit of the current-reducing unit, and then electrically connected to the control circuit power supply, and the control circuit power supply is then connected in series with the protection relay normally open contact or remote intelligent forced power off command connection Point, and then the trip coil of the circuit breaker is connected in series to form a trip circuit. When the protection relay normally open contact or remote intelligent forced power off command contact is turned on, the auxiliary contact is activated when the circuit breaker is closed. At this time, the trip coil of the circuit breaker is operated by the electrical energy of the control loop power supply or the current detection device to drive the trip mechanism of the circuit breaker to open the circuit breaker.

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