TWM583153U - Circuit breaker tripping loop system improvement device - Google Patents

Abstract

The invention is an improved device for a circuit breaker tripping loop system, 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. 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 can surely make the circuit breaker strong to make the circuit breaker 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

Circuit breaker tripping loop system improvement device

This creation is an improved device for circuit breaker tripping loop system, especially in the improvement of high-voltage power system. When an accident occurs in the system, the working power supply of the original tripping circuit is disabled, and the tripping coil of the effective power-driven circuit breaker cannot be provided. Act to isolate the accident. The circuit breaker tripping loop system improvement device of the present invention introduces the electric energy of the downflow unit of the current detecting device as the power source for the circuit breaker tripping coil to work, and can surely make the circuit breaker strong to make the circuit breaker tripping mechanism act. Open the circuit breaker to isolate the accident point and improve the safety of power consumption.

In the transmission (distribution) system, the high-voltage circuit breaker disk is a very important equipment and is valued. According to the certification requirements of Article 401 of the House Equipment Regulations, the high-voltage facilities, from the cabinet, high-voltage transformer, circuit breaker, and voltage regulator , flow comparators, lightning arresters, high-voltage fuses, etc., must be verified. It is reasonable to say that high voltage systems should be very reliable and have high safety and reliability. However, in practice, the situation of high-voltage power users has failed. In the discussion, there are many cases found. The crux of the problem is that the high-voltage system provides the power supply disability of the tripping circuit, which causes an accident! It has been found that in the high-voltage system, it is indeed a safe corner to provide a tripping circuit power supply component that can safely isolate the accident from the system. When the working power supply required for the tripping circuit is faulty, the system is actuated due to lack of electric energy, and the tripping mechanism cannot act to isolate the high-voltage accident. The consequences are quite serious, and the economic losses derived are even compensated. The problem is difficult to estimate.

The high-voltage circuit breaker disk has three kinds of actions, one is power-on and ON, the other is power-off and OFF, and the third is tripping trip isolation accident. The general command to drive the circuit breaker trip is from the protection of the power, and the information source for protecting the power is generally from the comparator CT to check whether there is an overload or short circuit accident, and the comparator PT checks whether there is over voltage or low. The condition of the voltage, the zero-phase comparator ZCT checks whether there is a grounding condition, or the temperature is too high, the frequency is abnormal, etc., etc., the sensing device provides protection for the electric 驿 to be turned on, and then the circuit breaker is disconnected to isolate the accident point. . At present, in the high-voltage power distribution system, many accidents cannot effectively isolate the accident and cause the circuit breaker to trip. Many of the reasons are due to the failure of the working power supply of the tripping circuit in the system. At present, in the world, on the high-voltage power distribution system, the tripping circuit working power used by the system is generally divided into a DC working power source and an AC working power source. The DC working power supply generally uses the battery pack as the working power source for the tripping loop, and the AC working power source generally uses the capacitor tripping device CTD as the main. At present, the tripping mode of the high-voltage circuit breaker is generally divided into two types, one is an electric type, using an internal action coil, and the other is a mechanical trip. Cases of high-voltage power distribution system accidents are listed as follows: Case 1, the explosion of the new Tianlun power plant in Taiwan Radio; Case 2, a semiconductor company in Guanyin Industrial Zone, the CTD fault of the protection power grid in the high-voltage disk, causing the Taipower substation to jump; A chemical plant in Hsinchu Industrial Zone, CTD fault caused 69KV main substation to jump, resulting in losses; Case 4, a chemical fiber plant in Fangyuan Industrial Zone CTD fault caused 69KV substation power jump, semi-finished products were completely destroyed; Case 5, a factory in Indonesia to protect electricity With CTD, the capacity is insufficient to cause a second accident; Case 6: Science Park electronics factory expands UPS failure; Case VII, a hospital in Hualien, the CTD of the high-voltage disk is accidentally touched and failed; Case VIII, Japan Fukushima nuclear disaster; Case IX, Soviet Union Car Nobby nuclear disaster...etc. In the above case, nothing is caused by the power failure of the tripping circuit of the control power supply in the circuit breaker disk in its supply (distribution) system, resulting in the system When a fault occurs, because there is no effective working power supply, an accident may occur, and the circuit breaker cannot be made to perform a corresponding tripping action to isolate the accident, or even cause a major loss such as a large power outage. Based on these cases, the causes of the accident are nothing more than 1. natural disasters, 2. man-made disasters, 3. negligence of inertia habits.

The high-voltage circuit breaker (H.V.CB) or the ultra-high-pressure CGIS or GIS is a command to receive the protection relay (Relay) as a means of tripping off the high-voltage circuit breaker to isolate the source of the accident. Therefore, if the circuit breaker cannot jump off immediately in the event of a short-circuit accident in a certain business unit (power receiving party), the high-voltage circuit breaker (HVCB) will be damaged, and the power supply to the main power supply mains will be extended to other businesses. The unit (power receiving party) causes a chain of industrial losses. Whether the high-voltage circuit breaker can jump in time is controlled by whether the relay can immediately issue an instruction. Therefore, when there is a problem with the working power supply for protecting the power, the protection power will not operate; when the protection power does not operate, the high voltage CB will not operate when the accident occurs, and it is impossible to isolate the accident of the public institution. Point, causing a serious secondary accident, and even affecting the Taipower power supply feeder to jump off! Don't be careless. Because this high-risk industrial safety incident often leads to accidents due to misjudgment, the operator of the mains supply line (Taiwan Electric Power Company) can prevent the electric breaker from jumping out of the circuit breaker due to the sudden voltage drop. The flow is saturated and slow, and the institution is required to set the protection system according to the regulations, and then the power supply is promised. The main provisions are: when the secondary side power supply of the comparator is used, it should be supplemented by a capacitive tripping device (CTD) or a capacitor tripping device and then connected to the uninterruptible power system (UPS), and electronically or The Capacitor Trip Unit (CTD) used in digital power units shall not be used for circuit breakers or other equipment. This is ideal, but accidents often come from ideal conditions. In practice, the UPS will almost always fail due to battery aging after one or two years. If the battery-based DC power supply system is used, the battery may be disabled after one year, but the business unit will not notice that the high-voltage circuit breaker (HVCB) will not trip when there is usually a short-circuit accident. , found that there is no tripping circuit DC power supply can not be supplied It is too late to use a power supply to protect the relay.

In the switchboard, in which the power circuit and the trip circuit of the circuit breaker are protected, the working power source for protecting the power is generally AC and DC can be used to provide the required working power. Under normal circumstances, DC power is a priority (AC and DC can only be selected), because DC power is generally stable and reliable.

The author of this author has proposed and patented several schemes for the improvement of the working power of the tripping loop in the high-voltage power distribution system in the high-voltage power distribution system. Especially in the improvement of the CTD of the capacitor tripping device, it can be tested under load, and the electric meter can display its voltage value. The disc surface type can effectively prevent the accident prevention caused by opening the high-voltage switchboard, and there is a voltage comparison circuit. And the capacitor circuit tripping device of the alarm circuit can solve the problem that the capacitor will attenuate due to time. The combination of the time circuit and the voltage comparison circuit can be used daily or set the time to simulate the occurrence of an accident, and whether the tripping circuit working power supply is sufficient to push The load device is used to isolate the accident, and further has the CTD of the automatic power conversion circuit to prevent the external power supply from supporting the AC and DC power supply when the capacitor trip device is faulty, and can solve the problems of voltage and capacity and communication, and the above solution The program is the product of the current market. And the capacitor tripping device CTD with backup power supply, DC storage energy source DC power capacitor tripping device CTD, high voltage electromagnetic switch VCS special capacitor tripping device CTD, DC system capacitive tripping device CTD, etc., all the above improvements The schemes are designed and manufactured to make the working power supply of the tripping loop in the high voltage system safer and more stable.

It can be known from the above that the high-voltage circuit breaker disk tripping circuit power supply is basically divided into two categories, one battery pack DC power supply and the other AC power supply. Generally from the secondary side of the high pressure comparator HV PT, because when a short circuit accident occurs in the high voltage system, the comparator PT The voltage dip is zero, resulting in no effective working power supply for the tripping loop, causing the circuit breaker to fail to trip the closed contact to isolate the accident. Therefore, a capacitor tripping device CTD is installed in the AC power supply system as the The working power supply of the system high voltage disk tripping loop. In general, the tripping circuit operating power supply can solve most of the problems in the case of a DC battery pack or a capacitor trip device for storing DC power. However, under special circumstances, such as a major earthquake, such as a natural disaster, or the loss of human factors, the circuit may be damaged or disabled, resulting in the circuit breaker not being able to trip the isolation point. For example, due to improper use of equipment, such as the use of UPS, the UPS is disabled due to UPS internal battery failure, resulting in many accident cases. The actual case, such as the Longshan substation, was not isolated due to accidents and caused a blackout in the Science Park. The Taipower Xintianlun case was caused by improper operation of the control power supply and no tripping isolation of the circuit breaker. It caused the explosion of the power plant and the casualties of dozens of people. The Fukushima nuclear power plant in Japan damaged the trip circuit due to the earthquake. There is no tripping, resulting in the failure of the cooling cycle system, causing nuclear disasters...etc. The above actual cases all illustrate the importance of the power supply for the tripping loop and the urgency of improvement. The invention is used to further improve the circuit breaker tripping loop system and improve the stability of the tripping loop power supply system.

Review the reasons for the failure of the tripping loop system in the high-voltage power distribution system. The cause of the burnout on the components such as the comparator PT is 1. Poor environment, excessive humidity, 2. Poor insulation of the PT body of the comparator (Insulation degradation, voids, etc.), 3. Invasion of animals, etc., will cause the PT to burn out; the cause of the burning of the comparator CT is 1. When the system is short-circuited, the secondary side causes Burning, 2. humid environment, 3. poor insulation, 4. grounding fault, etc.; will cause the comparator CT to burn; generally speaking, the secondary side of the flow CT can not open the circuit will generate high voltage, and burn the specific flow CT, so the CT secondary side must be connected in series with the load impedance to avoid open circuit; in general, the secondary side of the voltage regulator PT must not be short-circuited to generate excessive fault current, and burn the comparator PT, so The secondary side of the comparator PT must be connected in parallel with the load impedance to avoid short circuits. And in the general AC system, its control power supply, generally also uses the power supply on the secondary side of the voltage regulator PT as the working power source of the tripping loop. In the high-voltage system, the secondary side of the current transformer CT is a general current source, which is electrically connected to the meter indicating current and protection power. The secondary side of the voltage regulator PT is a general voltage source, which is electrically connected to the meter indicating voltage and protection. The electric raft is based on the electric energy equal to the voltage multiplied by the current (single phase), and the three-phase multiplied by √3 times of the electric energy. When the secondary current open current source of the comparator CT approaches zero, a high voltage is generated between the two ends, and vice versa. When the voltage source of the secondary side of the voltage regulator PT approaches zero, a high current is generated between the two terminals. Therefore, when the system fails, the comparator PT or the comparator CT will have abnormal state energy. In addition, the external power supply is disabled, the line is broken or the line is shorted, etc., which will affect the working power of the trip circuit.

The problem presented by the above-mentioned accident case, whether it is a natural disaster or a man-made disaster, the tripping system of the tripping circuit is disabled, and thus a great accident occurs. Therefore, under the existing architecture, the structure of the switchboard cannot be changed, the set value of the protection power cannot be changed, the structure of the circuit breaker cannot be changed, and the like. With the invention of the circuit breaker tripping circuit improvement device of the present invention, the function of the original tripping loop system is enhanced to achieve the safety function that cannot be protected in the past. In summary, the control circuit based on DC power or AC power is used in the trip circuit of the high voltage disk. When the power is disabled, the actual situation is faced in the field. In the past, this problem cannot be effectively solved. Therefore, from the actual situation of the situation in the field, a circuit breaker tripping loop system improvement device can solve the above problems and improve the safety and stability of the power distribution system.

An improved device for a circuit breaker tripping loop system, which is a conventional trip circuit The working power supply unit is strengthened and improved, except that the state of the existing DC power or the state of the AC power or the state of the DC-AC mixing is retained, the protection coordination mechanism set by the original system protection power is not changed, and the original switchboard is not changed. The structure and the state of the high-voltage circuit breaker that has been subjected to the stereotype test, the electric energy of the down-flow unit of the current detecting device is introduced, and the electric energy on the system line is simultaneously used, and the electric energy of the voltage source and the current source are used in series, and the protection is serially protected. The normally open contact action of the electric cymbal, the series connection circuit breaker closing the auxiliary contact, and the jump coil of the drive circuit breaker are connected in series to form a complete tripping loop system, and driving the internal tripping mechanism of the circuit breaker to make the circuit breaker actuate Discharge and disconnect the accident.

In order to achieve the above object, a circuit breaker trip circuit system improvement 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 interlock the circuit breaker The tripping mechanism disconnects the circuit breaker; and the circuit breaker tripping circuit improvement device comprises: at least one voltage detecting device disposed on the power circuit, the voltage detecting device comprising a voltage output reducing device a step-down unit; at least one current detecting device disposed on the power circuit, the current detecting device includes a downflow unit for reducing an output current; and at least one protection device disposed on the power circuit驿, the protection power is set according to the power system line, load status and protection coordination requirements, at least one of the protection electrical safety settings such as current, ground, voltage, frequency, temperature, etc., when the detection device value is greater than the electrical When the safety setting value is set, the protection electric power normally open contact is actuated; the circuit breaker tripping loop system improvement device is mainly based on the current detecting device, and can be supplemented Connect the AC or DC power output of the voltage detection device, battery pack, external power supply to the control loop power supply, and then connect the protection power to the normally open contact or the remote intelligent forced power off command contact and the series circuit breaker to close. Auxiliary contact, then serially connect The tripping coils of the circuit breaker are connected in series to form a tripping loop system. The protective electric power normally open contact or the remote intelligent forced power off command contact is turned on. When the circuit breaker is closed and the auxiliary contact is actuated, the trip coil of the circuit breaker is controlled by the control loop power supply or the current detecting device. The power of the flow unit is actuated to drive the trip mechanism of the circuit breaker to open the circuit breaker.

In order to achieve the above object, a circuit breaker trip circuit system improvement 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 interlock the circuit breaker The tripping mechanism disconnects the circuit breaker; and the circuit breaker tripping circuit system improving device comprises: at least one voltage detecting device disposed on the power circuit, the voltage detecting device includes a voltage output reducing device a step-down unit; at least one current detecting device disposed on the power circuit, the current detecting device includes a downflow unit for reducing an output current; and at least one protection device disposed on the power circuit驿, the protection power is set according to the power system line, load status and protection coordination requirements, at least one of the protection electrical safety settings such as current, ground, voltage, frequency, temperature, etc. When the value of the detecting device is greater than the electrical safety setting value, the protective power switch is normally turned on; the circuit breaker tripping circuit system improving device is connected to the current detecting device and connected in series with the protective power device. The point or far-end intelligent forced power-off command contact, the series-connected circuit breaker closes the auxiliary contact, and the tripping coils connected in series with the circuit breaker are connected in series to form a tripping loop system. When the protection electric power normally open contact or the remote intelligent forced power failure command contact is actuated, when the circuit breaker closes the auxiliary contact to be actuated, the tripping coil of the circuit breaker uses the electric energy of the current detecting device to descend the unit The trip mechanism of the circuit breaker is driven to open the circuit breaker.

1‧‧‧Circuit Breakout Circuit Improvement Device

10‧‧‧Circuit breaker

11‧‧‧ Current detecting device

12‧‧‧Voltage detection device

13‧‧‧Bounce mechanism

14‧‧‧Circuit Closed Auxiliary Contact

15‧‧‧Bounce coil

16‧‧‧Protection of electric poles

17‧‧‧ Remote Intelligent Forced Power Off Command Contact

18‧‧‧Control loop power supply

19‧‧‧Electrical protection

20‧‧‧Power automatic alternating circuit

Fig.1 Schematic diagram of wiring improvement of circuit breaker tripping loop system

Figure 2 Schematic diagram of current detecting device (currentizer)

Fig. 3 Schematic diagram of the jump circuit of the improved device of the circuit breaker tripping loop system

In the preferred embodiment of the circuit breaker trip circuit system improvement device, as shown in FIG. 1, a circuit breaker 10 is disposed on the power circuit, and the circuit breaker 10 has a trip coil 15 and the trip coil 15 interlocking the tripping mechanism 13 of the circuit breaker 10; the power circuit is provided with a voltage detecting device 12 (such as a voltage comparator), and the voltage detecting device 12 includes a step-down unit for reducing the output voltage; The pressure unit is electrically connected to the protection battery 19 and the control circuit power supply 18. A current detecting device 11 (such as a current transformer) is also disposed on the power circuit, and the current detecting device 11 includes a downflow unit for reducing the output current; the downflow unit is electrically connected to the protection device 19 and controls The loop power supply 18, the control loop power supply 18 is automatically alternated with the circuit 20 via the power supply, and the corresponding power is selected to be connected in series to the protection switch 19 to connect the protection power to the normally open contact 16. The protection device 19 sets the protection electrical safety setting value according to the power system line, the load state and the protection coordination requirement. When the protection setting value is reached, the protection power switch normally open contact 16 is actuated and can be connected to the remote end. The intelligent forced power-off command contact 17 is connected in series with the circuit breaker closing auxiliary contact 14, and the trip coils 15 of the circuit breaker 10 are connected in series to form a tripping loop system. In this way, the electric energy of the current detecting device 11 (such as a current transformer) and the electric energy of the voltage detecting device 12 (such as a voltage comparator) can be introduced to further improve the tripping coil 15 of the circuit breaker 10 when an accident occurs. There is enough power to drive the accident.

Please refer to Figure 2 for further explanation of the principles of this creation. As shown by the shaded box in FIG. 2, it is an equivalent circuit diagram of a general current detecting device (the current comparator). The current of the downflow unit of the current detecting 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 the current transformer) as the power supply for the circuit breaker 10 to trip the coil 15, the downstream unit of the current detecting device 11 is connected in parallel with the side branch path. When the power system is normal, the protection circuit 19 does not operate, and the internal protection power is normally open, and the circuit breaker 10 is open. The circuit breaker closes the auxiliary contact 14 to be in a conducting state, at which time no current flows through the side branch path. However, when the power system fails, the protection device 19 operates the protection switch, the normally open contact 16 is turned on, and the circuit breaker is closed. The auxiliary contact 14 is also turned on, and the side branch path constitutes a complete loop conduction state, and the current detecting device 11 ( The downflow cell current, such as the current comparator, passes through the side branch path and thus can be used as the power required to drive the circuit breaker 10 to trip the coil 15.

The technical characteristics of the current-side branching path of the current detecting device 11 (such as a flow comparator) are combined with the design of the conventional circuit breaker tripping power supply, please refer to FIG. The shaded box at the upper left of Figure 3 shows the tripping power supply of the battery pack BAT, the capacitor tripping device CTD or the uninterruptible power system UPS as the circuit breaker 10 tripping coil 15 in the conventional art, which is usually in general, Sufficient to provide the drive 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 cannot be driven to isolate the accident, which will cause great harm. If the technical characteristics of the current source of the downflow unit introduced into the current detecting device 11 (such as a current transformer) are integrated, it can be seen from FIG. 3 that when the system is faulty (the protective power is normally open, the contact 16 is turned on), When the battery pack, the capacitor trip device or the uninterruptible power system of the conventional technology is disabled, the current of the power circuit continues to pass through the circuit breaker 10 at this time, so the current detecting device 11 (such as the flow comparator) of the downflow unit The current source continues to circulate (see Figure 2). At this time, the power automatic altering circuit 20 is switched to the circuit of the current detecting state 11 due to the battery pack, the capacitor tripping device or the uninterruptible power system of the conventional technology, and the current flows into the circuit breaker as indicated by the dotted arrow. The tripping coil 15 of the 10 is driven to drive the tripping mechanism 13, so that the closed main contact of the circuit breaker 10 can be cut off to isolate the accident point, further improving the stability of the circuit breaker tripping loop system to ensure the operation of the power system. Security.

In summary, the creation circuit breaker trip circuit system improved device, further mention The stability of the circuit breaker tripping loop system has been improved, and the utilization of the system has been exploited. The relevant products in the market and the approved patent announcements have not seen the same technical features as the essence of this creation, and are also in line with novelty. Sexual and progressive statutory patent application requirements. To apply for a patent application in accordance with the law, you are requested to give the examination committee an early grant of the patent to ensure the applicant's rights and interests. However, the only one disclosed in this case is the preferred embodiment of this creation. It is not possible to limit the scope of the creation of this creation. Any equivalent change or modification made in accordance with the spirit of this creation still covers the scope of patent application for this creation. in.

Claims (2)

A circuit breaker tripping loop system improvement device is electrically connected to a power circuit, and the power circuit has at least one tripping coil for disconnecting the circuit breaker of the power circuit to interlock the tripping mechanism of the circuit breaker Opening the circuit breaker; and the circuit breaker tripping circuit improvement device comprises: at least one voltage detecting device disposed on the power circuit, the voltage detecting device comprising a voltage reducing unit for reducing an output voltage; At least one current detecting device disposed on the power circuit, the current detecting device includes a current flowing unit for reducing an output current; and at least one protective power device disposed on the power circuit, the protective power Depending on the power system line, load status, and protection coordination requirements, set at least one of the 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 value, The protection circuit is normally open and the contact point is actuated; the circuit breaker trip circuit system improvement device is mainly composed of a current detecting device, and is supplemented by a parallel voltage detecting device. The AC or DC power output of the battery pack and the uninterruptible power system is the control loop power supply, and then the protection power normally open contact or the remote intelligent forced power off command contact is connected in series, and then the trip coil of the circuit breaker is connected in series. Serially forming a tripping loop system, when the protective electric power normally open contact or the remote intelligent forced power off command is turned on, when the circuit breaker closes the auxiliary contact to be actuated, the tripping coil of the circuit breaker is controlled The power of the loop power or current detecting device is actuated to drive the tripping mechanism of the circuit breaker to open the circuit breaker. An improved device for a circuit breaker tripping loop system, which is electrically connected to a power circuit, and the power circuit has at least one circuit for disconnecting the power circuit The tripping coil of the circuit breaker opens the circuit breaker by interlocking the tripping mechanism of the circuit breaker; and the circuit breaker tripping circuit improvement device comprises: at least one voltage detecting device disposed on the power circuit The voltage detecting device comprises a step-down unit for reducing the output voltage; and at least one current detecting device disposed on the power circuit, the current detecting device comprising a downflow unit for reducing the output current; At least one protection electric raft disposed on the power circuit, the protection electric power setting at least one of the protection electrical safety setting values according to the power system line, the load state and the protection coordination requirement, such as current, ground, voltage, frequency, temperature When the value of the detecting device is greater than the electrical safety setting value, the protective circuit is normally open and the contact is activated; the circuit breaker tripping circuit system is improved, and the current detecting device is connected in series with the protection power. The open contact or the remote intelligent forced power-off command contact, and then the jump-off coils of the circuit breaker are connected in series to form a tripping loop system, the protection power is normally open contact or the remote end When the power-off command contact is actuated, when the circuit breaker closes the auxiliary contact, the trip coil of the circuit breaker drives the trip mechanism of the circuit breaker with the power of the current detecting device to open the open circuit. Device.