CN210016265U - High-voltage circuit breaker power-off tripping device - Google Patents

Abstract

The utility model discloses a high voltage circuit breaker outage trip gear, its power input electric energy that integrates the electric power return circuit, voltage detection device, current detection device and external support unit's electric energy input, borrow by microcontroller sequence control unit and internal circuit's signal processing, except can ensure the action of circuit breaker trip circuit, make the circuit breaker outage trip, improve shortcoming in the past. Meanwhile, the microcontroller sequence control unit can process according to the detected signals, and displays the state of the power circuit, the fault warning and the working state of the trip circuit through a visual display interface, so that the inspection and maintenance are convenient, and the safety of the power utilization system is improved.

Description

High-voltage circuit breaker power-off tripping device

technical field

The utility model relates to a power-off tripping device, in particular to a power-off tripping device for a high-voltage circuit breaker.

Background technique

In the existing power distribution system, the devices for power failure and tripping circuits are all configured separately under various control power conditions. As a result, the control circuits of a switchboard are all different, and are very complicated and difficult to repair. In the power failure trip circuit, the power supply of the trip circuit is often disabled, causing accidents. No significant improvement was obtained.

In power transmission or distribution systems, high-voltage circuit breaker panels (also known as power distribution cabinets) are very important equipment and are valued. Voltage regulators, current regulators, arresters, high-voltage fuses, etc., must be verified. It stands to reason that high-voltage systems should be very reliable and have high safety and reliability, but in practice, failures of high-voltage users have been heard from time to time. The discussion found that there are many cases, the crux is the failure of the working power supply that provides the trip circuit in the high-voltage system, resulting in an accident! Suddenly, it is found that in the high-voltage system, it has indeed become a safety blind spot to provide the system with a trip circuit working power supply component that can safely isolate accidents. When the component fails, the system cannot act to isolate the high-voltage accident due to lack of power, and the consequences are quite serious, even causing compensation problems.

The high-voltage circuit breaker panel has three actions, one is power-on closing (ON), the other is power-off opening (OFF), and the other is tripping (Trip) to isolate the accident. Generally, the command to drive the circuit breaker to trip comes from the protection The relay, and the information source of the protection relay, generally comes from the current comparator CT to check whether there is an overload or short circuit accident, and the voltage comparator PT to check whether there is an overvoltage or low voltage condition, and the zero comparator ZCT to check whether there is any In case of grounding condition, high temperature, frequency problem, etc., the sensing device provides an isolation accident in which the protective relay is actuated and turned on and then the circuit breaker is disconnected. In the current high-voltage power distribution system, many accidents cannot effectively isolate the accident point and cause the circuit breaker to trip, many of which are due to the failure of the working power supply of the trip circuit in the system. At present, in the high-voltage power distribution system in the world, the working power supply of the trip circuit used is generally divided into DC working power supply and AC working power supply. main. At present, the tripping methods of high-voltage circuit breakers are generally divided into two types, one is electric type, which uses an internal action coil; the other is mechanical tripping. The high-voltage power distribution system accident cases are listed as follows: Case 1. The explosion of Taiwan Electric Power Company in Taichung Xintianlun Power Plant; Case 2. A semiconductor company in Guanyin Industrial Zone, Taiwan, China, the failure of the special CTD for the protection relay in the high-voltage panel caused Taipower substation Power outage; Case 3: A chemical plant in Hsinchu Industrial Zone, Taiwan, China, the CTD failure caused the 69KV main substation to trip, causing losses; Case 4. The CTD failure of a chemical fiber factory in Taiwan Fangyuan Industrial Zone caused the 69KV substation to trip, and the semi-finished products were completely destroyed ;Case 5: The CTD used for the protection relay of a factory in Indonesia, the capacity is insufficient, causing a secondary accident; Case 6: The expansion of the UPS of the Electronics Factory in Taiwan Science Park, China; ; Case 8, Fukushima nuclear disaster in Japan; Case 9, Soviet Chernobyl nuclear disaster, etc. In the above cases, it is nothing more than when the power supply (distribution) system, the trip circuit of the control power supply in the circuit breaker panel is disabled, resulting in the failure of the system, because there is no effective working power When an accident occurs, it is impossible to make the circuit breaker trip as it should to isolate the accident, and even cause major losses such as power outages. In summary, there are 1. natural disasters, 2. man-made disasters, and 3. The negligence of inertial habits .

The high-voltage circuit breaker (H.V.CB) or UHV CGIS or GIS accepts the instruction of the protection relay (Relay) as whether to trip the high-voltage circuit breaker and isolate the source of the accident. Therefore, if the circuit breaker fails to trip immediately in the event of a short-circuit accident in a business unit (the power receiver) as scheduled, it will cause damage to the high-voltage circuit breaker (H.V.CB), which will also affect the supply of power from the main power supply trunk to other Institutions (recipients), resulting in chain industrial losses. Whether the high-voltage circuit breaker can trip in time is controlled by whether the protection relay (Relay) can issue commands in real time. Therefore, when there is a problem with the working power supply of the protective relay, the protective relay will not act; when the protective relay does not act, the high-voltage CB will not act when an accident occurs, and the accident point of the business unit cannot be isolated, resulting in A serious secondary accident may even affect the tripping of Taipower's power supply feeder! Can not be careless. Because of this high-risk industrial safety incident, accidents are often caused by misjudgment, so the power supply mains operator (China Taiwan Power Company) in order to prevent the relay from being unable to operate due to the voltage sag in the event of a short-circuit accident, the circuit breaker is tripped, and due to The saturation and slow action of the current device require institutions to set up a protection system in accordance with regulations before allowing power supply. The main provisions are: when the secondary side power supply of the voltage comparator is used, it should be supplemented by a capacitor trip device (CTD) or a capacitor trip device and then connected to the uninterruptible power system (UPS) in parallel, and the electronic or digital power supply should be used. The capacitor trip device (CTD) used by the type relay should not be connected to the circuit breaker or other equipment. This is ideal, but accidents often come from ideal conditions. In practice, uninterruptible power systems (UPS) will almost fail due to battery aging after one or two years. If a battery-based DC power supply system is used, the battery may fail after one year, but the business unit will not notice it. Usually, when there is a short-circuit accident, it is found that the high-voltage circuit breaker (H.V.CB) will not trip. , it is found that the DC working power supply without the trip circuit cannot supply the working power to the protection relay (Relay), but it is too late.

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

The applicant of the present invention has proposed several proposals and applied for patents for the improvement of the working power supply of the trip circuit in the high-voltage power distribution board 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 there is an electric meter to display its voltage value, to the panel type, which can effectively prevent the prevention of industrial safety accidents that may be caused by turning on the high-voltage switchboard, and has a voltage comparison circuit. And the capacitor tripping device of the alarm circuit can solve the problem that the capacitor will decay due to time. There is a combination of the time circuit and the voltage comparison circuit, which can be used daily or set the time to simulate whether the trip circuit working power is sufficient when an accident occurs. Push its load equipment to isolate the accident, and further have CTD of automatic power conversion circuit to prevent the failure of the capacitor tripping device, the external power supply has the support of AC and DC power supply, and can solve the problems of voltage, capacitance and communication, the above Solutions are products that are currently on the market. And the capacitor tripping device CTD with backup power supply, the DC energy storage DC power supply capacitor tripping device CTD, the high-voltage electromagnetic switch VCS special capacitor tripping device CTD, the capacitor tripping device CTD supporting the DC system, etc., the above improvement schemes, They are all designed and manufactured to make the working power supply of the trip circuit in the high-voltage system safer.

It can be seen from the above that the working power supply of the high-voltage circuit breaker disk trip circuit is basically divided into two categories, one is the DC power supply of the battery pack, and the other is the AC power supply, which generally comes from the secondary side of the high-voltage comparator HV PT. , because when a short-circuit accident occurs in the high-voltage system, the voltage of the voltage comparator PT drops to zero, resulting in no effective working power supply for the trip circuit, resulting in the circuit breaker being unable to trip the closed contact to isolate the accident. A capacitor tripping device CTD is installed in the power supply system to serve as the working power supply for the tripping circuit of the high-voltage plate of the system. Generally speaking, the trip circuit working power supply can solve most of the problems when the DC battery pack or the capacitor trip device is used to store DC energy, but under special conditions, such as natural disasters such as a major earthquake , or the negligence of human factors, the trip circuit may be damaged or disabled, causing the circuit breaker to fail to trip to isolate the accident point, for example, due to improper use of equipment such as the use of UPS, the failure of the UPS due to the failure of the internal battery of the UPS. This can lead to many accident cases. In actual cases, the Longshan Substation was not isolated due to the accident, causing a blackout in the Science Park, causing Taipower to trip and causing a large area power outage; Taipower Xintianlun Power Plant circuit breaker did not trip the isolation accident, resulting in many deaths. and explosion; Japan's Fukushima nuclear power plant damaged the trip circuit line due to the earthquake, and the high-voltage circuit breaker did not trip, resulting in the failure of the cooling circulation system, resulting in nuclear disasters, etc. The above actual cases all illustrate the importance of the trip circuit working power supply In view of the urgency of performance and improvement, there is the invention of the high-voltage circuit breaker power-off tripping device.

Review the reasons for the failure of the trip circuit system in the high-voltage power distribution system. The reasons for the burnout of components such as the voltage comparator PT are: 1. The environment is poor, the humidity is too heavy, 2. The voltage comparator PT body is insulated Not good (insulation deterioration, voids, etc.), 3. Animal intrusion, etc., will cause the voltage comparator PT to burn; the current comparator CT will burn out for the following reasons: 1. When a short circuit accident occurs in the system, the secondary side will cause Burning, 2. Wet environment, 3. Poor insulation, 4. Ground fault, etc., will cause the current comparator CT to burn; generally speaking, the secondary side of the current comparator CT should not be opened, which will generate high voltage voltage and burn the current comparator CT. , so the CT secondary side must be connected in series with the load impedance to avoid open circuit; generally speaking, the secondary side of the voltage comparator PT must not be short-circuited, which will generate excessive fault current and burn the voltage comparator PT, so the secondary side of the voltage comparator PT must be The load impedance is connected in parallel to avoid short circuit, and in the general AC system, the control power supply generally uses the secondary power supply of the voltage comparator PT as the working power source of the trip circuit. On the high-voltage system, the secondary side of the current comparator CT is a general power supply, which is electrically connected to the meter indicating current and protection relay, and the secondary side of the voltage comparator PT is a general voltage source, which is electrically connected to the meter indicating voltage and protection relay. Relay, according to the electric energy is equal to the voltage multiplied by the current (single-phase), the 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, a high voltage will be generated between the two terminals, and when the When the short-circuit voltage source on the secondary side of the voltage comparator PT approaches zero, a high current will be generated between the two terminals. Therefore, when the system fails, the voltage comparator PT or the current comparator CT will have abnormal state power, and the external power supply will fail. , line disconnection or line short circuit, etc., will affect the working power supply of the trip circuit.

The problems presented by the above-mentioned accident cases, 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 structure, the switchboard cannot be changed. The structure of the high-voltage circuit breaker cannot be changed, the setting value of its protective relay cannot be changed, and the structure of the circuit breaker cannot be changed. With the invention of the power-off tripping device of the high-voltage circuit breaker in this case, the function of the original trip circuit system is enhanced to achieve the previous Unprotected security functionality. To sum up, when the control circuit based on DC power supply or AC power supply is used for the tripping circuit of the high voltage panel to fail, the actual situation faced in the field cannot effectively solve this problem in the past. Therefore, according to the actual needs of the situation in the field, a high-voltage circuit breaker power-off and tripping device can solve the above-mentioned problems and at the same time improve the safety and stability of the power distribution system.

Utility model content

The utility model relates to a power-off tripping device for a high-voltage circuit breaker, which integrates the power input electric energy of a power circuit, a voltage detection device, a current detection device, and the electric energy input of an external support unit, and the sequence control unit is controlled by a microcontroller. And the signal processing of the internal circuit, in addition to ensuring the action of the high-voltage circuit breaker to trip the circuit, the high-voltage circuit breaker is powered off and tripped, and the shortcomings of the past are improved. At the same time, the sequence control unit of the microcontroller can process according to the detected signals, and display the status of the power circuit, fault warning and the working status of the trip circuit with a visual display interface, which is convenient for inspection and maintenance, and improves the safety of the power system. sex.

In order to achieve the above purpose, the present invention provides a high-voltage circuit breaker power-off and tripping device, which is electrically connected with a power circuit, and the power circuit has at least one tripping device for disconnecting the high-voltage circuit breaker of the power circuit. The coil is connected with the tripping mechanism of the high-voltage circuit breaker to disconnect the high-voltage circuit breaker; and the high-voltage circuit breaker power-off and tripping device includes: a voltage detection device arranged on at least one power circuit, the voltage detection device The measuring device includes a step-down unit for reducing the output voltage; a current detection device disposed on at least one of the power loops, the current detection device includes a current-decreasing unit for reducing the output current; There is at least one protection relay on the circuit. The protection relay is set according to the power system line, load status and protection coordination requirements to set at least one of its protective electrical safety settings, such as current, grounding, voltage, frequency, temperature, etc. When the value of the detection device is greater than the set value of the electrical safety, the normally open contact of the protection relay will actuate and conduct; the high-voltage circuit breaker trip circuit system improvement device is mainly based on the current detection device, which can be supplemented by parallel connection of the voltage detection device. The AC or DC power output of the measuring device, battery pack, external power supply, etc. is the control circuit power supply, and then the normally open contact of the protection relay or the remote intelligent forced power-off command contact is connected in series, and the auxiliary contact of the circuit breaker is connected in series, and then the high voltage is connected in series. The trip coils of the circuit breaker are connected in series to form a trip circuit system. The normally open contact of the protection relay or the remote intelligent forced power-off command contact is turned on. When the auxiliary contact of the high-voltage circuit breaker is closed and the auxiliary contact is turned on, the trip coil of the high-voltage circuit breaker is controlled by the control circuit power supply or the current detection device. The electric energy of the flow unit is actuated to drive the tripping mechanism of the high voltage circuit breaker to open the high voltage circuit breaker.

In order to achieve the above purpose, the present invention also provides a high-voltage circuit breaker power-off and tripping device, which is electrically connected to a power circuit, and the power circuit has at least one tripping device for disconnecting the high-voltage circuit breaker of the power circuit. The coil is disconnected to link the tripping mechanism of the high-voltage circuit breaker to disconnect the high-voltage circuit breaker; and the high-voltage circuit breaker power-off tripping device includes: a voltage detection device provided on the power circuit at least one, the voltage The detection device includes a step-down unit for reducing the output voltage; a current detection device disposed on at least one of the power loops, the current detection device includes a current-decreasing unit for reducing the output current; At least one protection relay on the power circuit, the protection relay sets at least one of its protective electrical safety settings such as current, grounding, voltage, frequency, temperature, etc. according to the power system line, load status and protection coordination requirements. When the value of the detection device is greater than the electrical safety setting value, the normally open contact of the protection relay is actuated and turned on; the high-voltage circuit breaker trips the circuit system improvement device, and the current detection device is connected in series with the protection relay normally open The contact point or the remote intelligent forced power-off command contact, the closing auxiliary contact of the high-voltage circuit breaker in series, and the trip coil of the high-voltage circuit breaker are connected in series to form a trip circuit system. When the normally open contact of the protection relay or the remote intelligent forced power-off command contact is actuated and turned on, when the auxiliary contact of the high-voltage circuit breaker is closed, the trip coil of the high-voltage circuit breaker is activated by the current detection device. The electric energy is used to drive the tripping mechanism of the high voltage circuit breaker to open the high voltage circuit breaker.

In order to achieve the above-mentioned purpose, the high-voltage circuit breaker power-off and tripping device of the present invention is electrically connected to a power circuit, and the power circuit has at least one trip coil for disconnecting the high-voltage circuit breaker of the power circuit for interlocking. The tripping mechanism of the high-voltage circuit breaker disconnects the high-voltage 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 provided on the power circuit, the current detection device comprising a current-reducing unit for reducing the output current; and at least one protection relay provided on the power circuit, the protection relay according to the The state of the power system line, set at least one of its protective electrical safety settings, such as current, grounding, voltage, frequency, temperature, etc., when the detection device value is greater than the electrical safety setting value, the protection relay is normally open Contact action is turned on;

The high-voltage circuit breaker power-off and tripping device includes: a main control board, the main control board is electrically connected to an external power connection unit, an internal voltage comparison unit, a microcontroller sequence control unit, a jumper A trip circuit power supply circuit, a capacitor energy storage circuit, a sensing device connection unit, an external device device connection unit, a trip circuit connection unit, and a status display unit. A trip circuit power supply circuit, which is electrically connected to the sequence control unit of the microcontroller, and uses appropriate power output as the trip circuit driving power; a capacitor energy storage circuit, which is electrically connected to the trip circuit power circuit, Appropriate DC power for energy storage; an external power supply connection unit, which is electrically connected to the external AC power and DC power to the main control board; an internal voltage comparison unit, which is electrically connected to the external power supply connection unit, the sensing device connection unit, and the status display unit ; a microcontroller sequence control unit, which is electrically connected to the external power supply connection unit, the sensing device connection unit, and the internal voltage comparison unit, and selects an appropriate electrical energy to be electrically connected to the trip circuit power supply circuit through the internal setting sequence; a trip circuit A circuit connection unit, the trip circuit connection unit is on the main control board, and the contacts of the external equipment and device connection units are electrically connected in series to form a trip circuit, and are electrically connected to the trip circuit power circuit; a sensing device is connected unit, the sensing device connection unit includes at least two detections of current detection device and voltage detection device; an external equipment device connection unit, the external equipment device connection unit at least includes a protection relay normally open contact, a high-voltage circuit breaker The two ends of the trip coil or the external forced command contact; a state display unit, which can display the state of the system trip circuit and the state of each power supply; Or voltage source power, after rectification into DC power, the capacitor stores DC power or external power, and the trip circuit power supply circuit provides trip drive power through the microcontroller sequence control unit, and the trip circuit connects the unit to form a complete jump. In the circuit breaker, when the auxiliary contact of the high-voltage circuit breaker is turned on, the trip coil of the high-voltage circuit breaker is driven to link the tripping mechanism of the high-voltage circuit breaker to disconnect the high-voltage circuit breaker.

In order to achieve the above purpose, a high-voltage circuit breaker power-off and tripping device of the present invention is electrically connected with a power circuit, and the power circuit has at least one trip coil for disconnecting the high-voltage circuit breaker of the power circuit. Disconnect the high-voltage circuit breaker with a tripping mechanism linked to the high-voltage circuit breaker; and a voltage detection device provided on at least one of the power circuits, the voltage detection device includes a step-down unit for reducing the output voltage ; and at least one current detection device provided on the power circuit, the current detection device includes a current-reducing unit for reducing the output current; and at least one protection relay provided on the power circuit, the protection According to the circuit state of the power system, the relay sets at least one of its protective electrical safety setting values, such as current, grounding, voltage, frequency, temperature, etc., when the detection device value is greater than the electrical safety setting value, the protection relay The normally open contact actuates and conducts; and the high-voltage circuit breaker power-off and tripping device includes: a main control board, and the electrical connection of the main control board includes an AC-DC conversion circuit, a trip circuit power supply circuit, a Capacitive energy storage circuit, a power supply automatic alternation circuit, a sensing device connection unit, an external equipment device connection unit, a status display unit; an AC-DC conversion circuit, the AC-DC conversion circuit is electrically connected to the voltage detection device. The step-down unit, or external AC power, converts the AC power into DC power, and uses the capacitor energy storage to electrically connect the DC power to the capacitor energy storage; a trip circuit power supply circuit is at least electrically connected to the voltage detection device for voltage reduction unit, current detection device current-reducing unit or external support power supply; a capacitor energy storage circuit, the capacitor energy storage circuit is electrically connected to the trip circuit power supply circuit, and stores appropriate DC energy; a power supply automatic alternation circuit, which is electrically connected The trip circuit power supply circuit, the capacitor energy storage circuit uses the appropriate power output as the trip circuit drive power; a sensing device connection unit, the sensing device connection unit at least includes two or more items of current detection device and voltage detection device ;

An external device connection unit, the external device device connection unit at least includes a normally open contact of a protection relay, both ends of a trip coil of a high-voltage circuit breaker or an external forced command contact; a status display unit, which can display the system The state of the tripping circuit; a high-voltage circuit breaker power-off tripping device can be rectified into DC power according to current source power or voltage source power, and then the capacitor stores DC power or external power, and provides tripping drive through the power supply automatic alternating circuit The electric energy is then connected to the normally open contact of the protection relay in series, or the normally open contact of the protection relay is connected in parallel to the external forced command contact to actuate and conduct. When the auxiliary contact of the high-voltage circuit breaker is closed, the trip coil of the high-voltage circuit breaker is driven The high-voltage circuit breaker is disconnected by linking the high-voltage circuit breaker tripping mechanism. A high-voltage circuit breaker power-off tripping device is electrically connected to a power circuit, and the power circuit has at least one trip coil for disconnecting the high-voltage circuit breaker of the power circuit to link the tripping of the high-voltage circuit breaker The tripping mechanism disconnects the high-voltage circuit breaker; and the high-voltage circuit breaker power-off and tripping device includes: a voltage detection device arranged on at least one of the power circuits, and the voltage detection device includes a voltage drop for reducing the output voltage voltage unit; at least one current detection device provided on the power circuit, the current detection device includes a current drop unit for reducing the output current; at least one protection relay provided on the power circuit, the protection According to the power system line, load status and protection coordination requirements, the relay sets at least one of its protective electrical safety settings, such as current, grounding, voltage, frequency, temperature, etc., when the detection device value is greater than the electrical safety setting. When the value is fixed, the normally open contact of the protection relay is actuated and turned on; the high-voltage circuit breaker is powered off and tripping device, and the current detection device is connected in series with the normally open contact of the protection relay or the remote intelligent forced power-off command contact, and then connected in series. The trip coil connected to the high-voltage circuit breaker is connected in series to form a trip circuit system. When the normally open contact of the protection relay or the remote intelligent forced power-off command contact is actuated and conducted, when the high-voltage circuit breaker is closed, the auxiliary contact is actuated and conducted. and the trip coil of the high-voltage circuit breaker drives the tripping mechanism of the high-voltage circuit breaker with the electric energy of the current detection device to disconnect the high-voltage circuit breaker.

Description of drawings

1 is a schematic diagram of the wiring of a high-voltage circuit breaker power-off and tripping device according to an embodiment of the present invention;

2 is a schematic circuit diagram of a current detection device according to an embodiment of the present invention;

3 is a schematic diagram of a trip circuit circuit of a power-off tripping device for a high-voltage circuit breaker according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a power-off and tripping device for a high-voltage circuit breaker according to an embodiment of the present invention; and

5 is a schematic appearance diagram of a visual display device of a power-off and tripping device of a high-voltage circuit breaker according to an embodiment of the present invention.

Symbol description: high-voltage circuit breaker power-off tripping device 1; high-voltage circuit breaker 10; current detection device 11; voltage detection device 12; tripping mechanism 13; high-voltage circuit breaker closing auxiliary contact 14; trip coil 15; protection relay Normally open contact 16; remote intelligent forced power-off command contact 17; trip circuit power supply circuit 18; protection relay 19; power supply automatic alternation circuit 20; sensing device connection unit 21; external support unit 24; external power supply connection unit 25; trip circuit connection unit 26; main control substrate 30; internal voltage comparison unit 180; first detection circuit 181; first display unit 182; microcontroller sequence control unit 183; AC/DC conversion circuit 184; DC power alternate circuit 185; second detection circuit 186; second display unit 187; switch B contacts 188, 189; The third display unit 193 .

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In the high-voltage circuit breaker power-off and tripping device according to the embodiment of the present invention, the operation principle of the trip circuit is shown in FIG. 1 . The trip coil 15 is linked to the trip mechanism 13 of the high-voltage circuit breaker 10; the power circuit is provided with a voltage detection device 12 (such as a voltage comparator), and the voltage detection device 12 includes a step-down device for reducing the output voltage unit; the step-down unit is electrically connected to the protection relay 19 and the trip circuit power circuit 18 . The power loop is also provided with a current detection device 11 (such as a current converter), 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 trips The loop power supply circuit 18 , the tripping loop power supply circuit 18 selects the corresponding electric energy to be connected to the protection relay 19 in series through the power supply automatic alternation circuit 20 to connect the normally open contact 16 of the protection relay. 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 normally open contact 16 of the protection relay is actuated and turned on, and can be connected in parallel. The remote intelligent forced power-off command contact 17 is connected in series with the closing auxiliary contact 14 of the high-voltage circuit breaker, and then the trip coil 15 of the high-voltage circuit breaker 10 is connected in series to form a trip circuit system. In this way, the electric energy of the current detection device 11 (such as a current comparator) and the electric energy of the voltage detection device 12 (such as a voltage comparator) can be introduced to further improve the trip coil of the high-voltage circuit breaker 10 when an accident occurs. 15 has enough power to drive to isolate the accident.

Please refer to FIG. 2 for further description of the principle of the embodiment of the present invention. The block on the right side of FIG. 2 is a schematic diagram of an equivalent circuit of a general current detection device (current comparator). The current of the down-current 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 trip coil 15 of the high-voltage circuit breaker 10 , the present invention connects a side branch path in parallel with the current drop unit of the current detection device 11 . When the power system of this side branch is normal, the protection relay 19 does not operate and the normally open contact 16 of the internal protection relay is open, and the auxiliary contact 14 of the high-voltage circuit breaker 10 is closed, and there is no current at this time. Flow through the side branch path. However, when the power system fails, the protection relay 19 acts, the normally open contact 16 of the protection relay is turned on, and the auxiliary contact 14 of the high-voltage circuit breaker is also turned on, and the side branch path constitutes a complete circuit conduction state, and the current detection device 11 ( For example, the current of the down-current element of the current transformer passes through the side branch path, so it can be used as the power required by the high-voltage circuit breaker 10 to trip the coil 15 for driving.

Please refer to FIG. 3 for combining the technical features of the side branch path of the current detecting device 11 (eg, the current transformer) with the design of the high-voltage circuit breaker trip power supply in the prior art. The shaded square in the upper left of FIG. 3 shows that in the prior art, the battery pack BAT, the capacitor tripping device CTD or the uninterruptible power supply system UPS are used as the tripping power source for the tripping coil 15 of the high-voltage circuit breaker 10. It is sufficient to provide the driving power required for the high-voltage circuit breaker 10 to trip the coil 15 . However, when the battery, the capacitor tripping device or the uninterruptible power supply system is disabled due to human negligence or natural disasters, the tripping coil 15 cannot be driven to isolate the accident, which will cause great harm. If the aforementioned technical features of the current source of the down-current unit introduced into the current detection device 11 (such as a current comparator) are integrated, it can be seen from FIG. When the battery pack, the capacitor tripping device or the uninterruptible power supply system are all disabled, the current of the power circuit continues to pass through the high-voltage circuit breaker 10, so the current source of the current-reducing unit of the current detection device 11 (such as the current transformer) There is still a continuous flow of current (see Figure 2). At this time, the automatic power supply alternate circuit 20 is switched to the circuit of the current detection state 11 due to the failure of the battery pack, the capacitor tripping device or the uninterruptible power supply system in the prior art, and the current flows into the high-voltage circuit breaker as indicated by the dotted arrow. The trip coil 15 of the circuit breaker 10 is used to drive the trip mechanism 13 to act, so that the closed main contact of the high voltage circuit breaker 10 can be cut off to isolate the accident point, which further improves the stability of the trip circuit system of the high voltage circuit breaker to ensure the power The safety of system operation.

As mentioned above, the power-off and tripping device of the high-voltage circuit breaker according to the embodiment of the present invention intends to ensure that the trip circuit of the circuit breaker can be executed stably, and to easily understand the operation of the circuit breaker and the status inspection of the power circuit through a visual interface. An example is shown in Figure 4. Components or blocks with the same function in the icon are marked with the same number. Please refer to FIG. 4 , the high-voltage circuit breaker power-off and tripping device 1 has an external power supply connection unit 25 for standardized connection to the external support unit 24 , the voltage detection side device 12 , the current detection device 11 , and the protection relay 19 and other related input terminals Signal continues. The external power supply connection unit 25 then connects the input terminal signal to the corresponding circuit of the main control board 30 . The external support unit 24 may be, for example, a battery pack BAT, a capacitor trip device (CTD), or an uninterruptible power supply system (UPS). For example, taking a battery pack as an example, the external support unit 24 connects the signal to the DC input terminal of the DC power alternating circuit 185 and the AC input terminal of the step-down unit connected to the voltage detection device 12 via the external power connection unit 25 . The external support unit 24, such as a battery pack, can be used as one of the power sources required for the operation of the circuit breaker tripping circuit. In addition, the step-down unit of the voltage detection device 12 is also connected to the AC input terminal through the external power supply connection unit 25, 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. This conversion The latter DC power supply, together with the power output from the connected external support unit 24, is simultaneously connected to the DC power supply alternating circuit 185. The DC power alternating circuit 185, when the output from the voltage detecting device 12 step-down unit is powered, The DC power output of the AC-DC conversion circuit 184 is preferably used to charge the capacitor energy storage circuit 190, and the capacitor is used to store the electric energy required for tripping the circuit. If the step-down unit of the voltage detection device 12 is disabled, the DC power supply alternate circuit 185 selects the power supply of the external support unit 24 to charge the capacitor energy storage circuit 190 . The DC power alternating circuit 185 can usually be achieved by using a 2A2B1C relay module or a switching module with the same function (not shown). The output power of the DC power alternating circuit 185 (ie, the output power of the capacitor energy storage circuit 190 ) and the power of the connected external support unit 24 are simultaneously input to the DC power parallel output circuit 191 , and the DC power parallel output circuit 191 is stored in a capacitor. The power of the power circuit 190 is given priority to provide the power required to trip the loop. The parallel output circuit 191 of the DC power supply can usually be achieved by using a 2A2B1C relay module or a switching module with the same function (not shown). In order to facilitate checking the status of the trip circuit power supply circuit 18, the outputs of the external support unit 24, the capacitor energy storage circuit 190, and the DC power parallel output circuit 191 can be respectively connected to the detection circuit and the display unit, such as the meter head, the seven-segment Monitor or other LCD panel (not shown). The detection circuit is provided with a voltage comparison circuit for judging whether the voltage is higher than a default value for necessary warning.

The external power connection unit 25 also connects the external power signal to the internal voltage comparison unit 180. The internal voltage comparison unit 180 (for example, a voltage dividing and current reducing circuit) is isolated by the optical coupling chip to detect the power of each phase sequence. status (power/no power), and input the signal to the microcontroller sequence control unit 183. The microcontroller sequence control unit 183 judges whether the power circuit has faults such as phase loss, reverse power transmission, tripping, etc. The status is displayed by the status display unit 23 to give corresponding warnings accordingly.

As shown in FIG. 2 , the circuit diagram of the current detection device (current comparator) is achieved by connecting the wiring of the side branch path through the tripping loop connecting unit 26 . The trip circuit connection unit 26 electrically connects the external device device connection unit 22 and each contact in series to form a trip circuit, and is electrically connected to the trip circuit power supply circuit 18. When the side branch path in FIG. 2 is turned on , the side branch current of the trip circuit connection unit 26 and the output of the DC power supply parallel output circuit 191 are connected to the power supply automatic exchange circuit 20, and the power supply automatic exchange circuit 20 preferably selects the power supply from the DC power supply parallel output circuit 191, the DC power supply When the power supply of the parallel output circuit 191 fails, it switches to the side branch path of the current drop unit of the current detection device 11. At this time, the normally open contact 16 of the protection relay is turned on, and the auxiliary contact 14 of the high-voltage circuit breaker is also turned on. The current of the measuring 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. Similarly, the automatic power supply alternation circuit 20 can usually be achieved by using a 2A2B1C relay module or a switching module with the same function (not shown). The simulated fault occurrence instruction in FIG. 4 can be issued via the microcontroller sequence control unit 183 to facilitate testing the working state of the trip circuit power supply circuit 18 . In addition, the external command for driving the remote intelligent forced power-off command contact 17 can also be received by the microcontroller sequence control unit 183 from a remote command, so as to control the trip coil 15 of the high-voltage circuit breaker 10 . The external device connection unit 22 , as mentioned above, at least includes a normally open contact 16 of a protection relay, both ends of the trip coil 15 of the high-voltage circuit breaker 10 or a remote intelligent forced power-off command contact 17 . The sensing device connection unit 21 at least includes a current detection device and a voltage detection device for detecting two or more signals.

Referring to FIG. 5 again, it is the status display panel of the visual interface of the power-off tripping device of the high-voltage circuit breaker according to the embodiment of the present invention. The displayed signal interface is connected to the sequence control unit 183 of the microcontroller, which can display the tripping circuit of the system. status and power status.

To sum up, the high-voltage circuit breaker power-off tripping device of the embodiment of the present invention further improves the stability of the circuit breaker tripping circuit system, and has deep industrial applicability.

The above are only the preferred embodiments of the present utility model, and are not intended to limit the scope of the present utility model patent. Any equivalent structure or equivalent process transformation made by using the contents of the present utility model description and accompanying drawings, or directly or indirectly applied to other related The technical field of the present invention is similarly included in the scope of patent protection of the present invention.

Claims (6)

1. A high-voltage circuit breaker power-off tripping device is electrically connected to a power circuit, and the power circuit has at least one trip coil for disconnecting the high-voltage circuit breaker of the power circuit, so as to link the high-voltage circuit breaker. The tripping mechanism operates; a current detection device arranged on the power circuit, the current detection device includes a current drop unit for reducing the output current; and a protection relay arranged on the power circuit, the protection relay according to The state of the power circuit is set to protect the electrical safety setting value, and when the value of the voltage detection device or the current detection device is greater than the electrical safety setting value, the protection relay is braked and turned on; It is characterized in that, the power-off and tripping device of the high-voltage circuit breaker of the power circuit includes: a main control board, the main control board includes an external power supply connection unit, an internal voltage comparison unit, a microcontroller sequence control unit, a trip loop power supply circuit, a capacitor energy storage circuit, a sensing device connection unit, an external equipment device connection unit, a trip circuit connection unit and a status display unit; in, The trip circuit power supply circuit is electrically connected to the microcontroller sequence control unit, and uses a preset power output as the trip circuit driving power; The capacitor energy storage circuit is electrically connected to the trip circuit power supply circuit, and is used for storing DC energy; The external power connection unit is electrically connected to the external AC power or DC power to the main control board; the internal voltage comparison unit is electrically connected to the external power supply connection unit, the sensing device connection unit and the status display unit; The microcontroller sequence control unit is electrically connected to the external power supply connection unit, the sensing device connection unit and the internal voltage comparison unit, and selects an electric energy to be electrically connected to the trip loop power supply circuit through an internal setting sequence; The trip circuit connection unit assists the main control substrate to electrically connect the contacts of the external equipment device connection unit in series to form a trip circuit, and is electrically connected to the trip circuit power circuit; The sensing device connection unit at least includes the current detection device; The external equipment device connection unit at least includes a contact of a protection relay, both ends of a trip coil of a high-voltage circuit breaker or an external forced command contact; The status display unit is used to display the status of the trip circuit and the status of each power supply; The high-voltage circuit breaker power-off tripping device is rectified into DC power according to the current source power or voltage source power, and then the DC power is stored by the capacitor, or the external power is stored, and the trip circuit power supply circuit provides tripping through the microcontroller sequence control unit. The driving electric energy forms a trip circuit circuit through the trip circuit connection unit. When the contact of the protection relay is turned on, it drives the trip coil of the high-voltage circuit breaker to link the trip mechanism of the high-voltage circuit breaker to disconnect the high-voltage circuit breaker. device. 2 . The power-off and tripping device of a high-voltage circuit breaker as claimed in claim 1 , wherein the external equipment device connection unit is a normally open contact including the protection relay. 3 . 3. The high-voltage circuit breaker power-off and tripping device as claimed in claim 1, wherein the protection relay is based on the power system line, load status and protection coordination requirements, and its protection electrical safety setting value is based on the current, Set at least one of ground, voltage, frequency, and temperature. 4. A high-voltage circuit breaker power-off tripping device is electrically connected to a power circuit, the power circuit has a trip coil for disconnecting the high-voltage circuit breaker of the power circuit, so as to link the tripping of the high-voltage circuit breaker The mechanism disconnects the high-voltage circuit breaker; a voltage detection device provided on the power circuit, the voltage detection device includes a step-down unit for reducing the output voltage; a current detection device provided on the power circuit, the The current detection device includes a current drop unit for reducing the output current; and a protection relay arranged on the power circuit, the protection relay sets the protection electrical safety setting value according to the state of the power circuit, when the voltage detection When the value of the device or the current detection device is greater than the electrical safety setting value, the protection relay is turned on; It is characterized in that, the high-voltage circuit breaker power-off and tripping device includes: A main control board, electrically connected to an AC-DC conversion circuit, a trip circuit power supply circuit, a capacitor energy storage circuit, a power supply automatic alternation circuit, a sensing device connection unit, an external device device connection unit and a status display unit; in, The AC-DC conversion circuit is electrically connected to the step-down unit of the voltage detection device, or is electrically connected to external AC power, converts the AC power to DC power, and uses a capacitor energy storage circuit to electrically convert the DC power connected to capacitor energy storage; The trip loop power supply circuit is at least electrically connected to the step-down unit of the voltage detection device, the current step-down unit of the current detection device or an external support power supply; The capacitor energy storage circuit is electrically connected to the trip circuit power supply circuit to store proper DC power; The power supply automatic alternation circuit is electrically connected to the trip circuit power supply circuit, and the capacitor energy storage circuit outputs the appropriate electric energy as the trip circuit driving electric energy; The sensing device connection unit is electrically connected to at least one of the current detection device and the voltage detection device; The external equipment device connection unit at least includes a node of a protection relay, both ends of a trip coil of a high-voltage circuit breaker or an external forced command contact; The state display unit is used to display the state of the trip circuit; The high-voltage circuit breaker power-off tripping device is rectified into DC power according to the current source power or voltage source power, and then the DC power is stored by the capacitor, or the external power is stored, and the tripping driving power is provided by the power supply automatic alternating circuit, and then the protection is connected in series. The normally open contact of the relay, or the normally open contact of the protection relay is connected in parallel with the external forced command contact to conduct. When the auxiliary contact of the high-voltage circuit breaker is closed, the trip coil of the high-voltage circuit breaker is driven to connect the high-voltage circuit breaker. The circuit breaker trip mechanism disconnects the high voltage circuit breaker. 5 . The power-off and tripping device of a high-voltage circuit breaker according to claim 4 , wherein the external equipment device connection unit is a normally open contact including the protection relay. 6 . 6. The high-voltage circuit breaker power-off and tripping device as claimed in claim 4, wherein the protection relay is based on the power system line, load status and protection coordination requirements, and the protection electrical safety setting value is based on the current, Set at least one of ground, voltage, frequency, and temperature.

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