CN210016275U

CN210016275U - Improved capacitor tripping device for high-voltage AC system

Info

Publication number: CN210016275U
Application number: CN201920721936.1U
Authority: CN
Inventors: 陈锡瑜
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-05-20
Filing date: 2019-05-20
Publication date: 2020-02-04
Anticipated expiration: 2029-05-20

Abstract

The utility model discloses a high voltage alternating current system electric capacity jumps and takes off improvement device, it is to improve high voltage electric power safety coefficient. The utility model discloses high pressure alternating current system electric capacity jumps improvement device to the electric energy of voltage source and current source on the system line, as the working power supply in circuit breaker trip loop, can make the trip mechanism action of circuit breaker really, make the circuit breaker open, with isolation accident point electric current, promote the security of power consumption.

Description

Improved capacitor tripping device for high-voltage AC system

Technical Field

The utility model relates to a high voltage alternating current system electric capacity jumps improvement device, especially a device borrows the jump coil of the electric energy drive circuit breaker on the system line under the state that does not change original high voltage system facility, forms a complete jump return circuit system, when can guaranteeing high voltage electric power system to take place the accident, makes high voltage circuit breaker open a way and cuts off the high voltage electric power return circuit of accident point.

Background

In an electric power transmission (distribution) system, a high-voltage breaker panel (also called a power distribution cabinet) is a very important device and is emphasized, and according to the certification requirement of indoor device rules, high-voltage facilities such as a box body, a high-voltage transformer, a breaker, a transformer, a current transformer, a lightning arrester, a high-voltage fuse and the like all need to pass verification. The high voltage system should be reasonably reliable and safe, but in practice, the failure of the high voltage powered subscriber is often perceived. In many cases, the fault is the failure of the working power supply to provide a trip circuit in a high voltage system, which results in an accident! The existence of a trip circuit working power supply assembly which can safely isolate accidents in a high-voltage system is discovered every so far, and the trip circuit working power supply assembly is surely a dead angle in safety. When the working power supply required by the trip circuit fails, the system is actuated due to lack of electric energy, the trip mechanism cannot be actuated to isolate high-voltage accidents, the consequence is quite serious, and derived economic loss or even compensation problems are difficult to estimate.

The high-voltage breaker plate has three actions, namely, ON closing when power is ON, OFF opening when power is OFF, and Trip isolation accidents when faults occur. The general instruction for driving the circuit breaker to trip comes from the protection relay, the information source for protecting the relay comes from the current transformer CT to inspect whether there is overload or short circuit accident, the voltage transformer PT inspects whether there is over-voltage or low-voltage condition, the zero current transformer ZCT inspects whether there is grounding condition or over-temperature, abnormal frequency problem, etc., the above-mentioned sensing device provides the protection relay to operate and conduct, and further makes the circuit breaker open to isolate the accident point. In the prior high-voltage distribution system, a plurality of accidents can not be effectively isolated when happening, and the circuit breaker is tripped, wherein a plurality of reasons are that the working power supply of a tripping loop in the system is disabled. In high-voltage distribution systems in the world, trip loop working power supplies used in the high-voltage distribution systems are generally divided into direct-current working power supplies and alternating-current working power supplies. The dc power supply generally uses a battery pack as a power supply for the trip circuit, and the ac power supply generally uses a capacitor trip device CTD as a main power supply. The tripping modes of the existing high-voltage circuit breaker are generally divided into two types, one is electric, an internal action coil is used, and the other is mechanical tripping. The accident case of the high-voltage distribution system is inexhaustible, and the accident case is that when the system is in a power supply (distribution) system, the working electric energy of a trip loop of a control power supply in a breaker panel is lost, so that when the system breaks down, and an accident happens because no effective working power supply exists, the breaker cannot be correspondingly tripped to isolate the accident, and even heavy losses such as heavy power failure are caused.

A high-voltage circuit breaker (H.V.CB) or an extra-high voltage CGIS or GIS receives an instruction of protecting a Relay (Relay) to be used as whether to trip the high-voltage circuit breaker or not and isolate an accident source. Therefore, if the circuit breaker cannot be immediately tripped when a short-circuit accident occurs in a certain business unit (power receiver) as expected, the high-voltage circuit breaker (h.v.cb) will be damaged, and the high-voltage circuit breaker will extend to influence the main power supply main to supply power to other business units (power receivers), resulting in interlocking industrial loss. Whether the high-voltage circuit breaker can be tripped in time or not is controlled by whether a protection Relay (Relay) can send an instruction in real time or not. Therefore, when the working power supply for providing the protection relay has a problem, the protection relay will not act; when the relay can not act, the high-voltage CB can not act when an accident happens, the accident point of a public institution can not be isolated, a serious secondary accident is caused, and even the tripping of a power supply feeder line is influenced! It is not possible to use them carelessly. Because the high-risk safety accident is often caused by misjudgment, an operator (such as taiwan power company) of the power supply main line (for example, taiwan power company) cannot operate to trigger the circuit breaker to trip due to the voltage step in order to prevent the relay from short-circuit accident, and requires a protection system to be set by the utility according to the regulations so as to answer the power supply due to the saturation and slow operation of the current transformer. The main prescriptions are: when the secondary side power supply of the voltage comparator is adopted, a Capacitor Tripping Device (CTD) or a capacitor tripping device is assisted and then is connected with an Uninterruptible Power System (UPS), and the Capacitor Tripping Device (CTD) used by an electronic or digital relay is not required to be used by a circuit breaker or other equipment. In any event, this is only ideal for optimization, but the surprise often comes from the ideal situation where a real Uninterruptible Power System (UPS) will fail almost a year or two after battery aging. If a dc power supply system mainly using a storage battery pack is used, the battery may be disabled after one year, but the utility cannot detect the short-circuit accident, and usually, the high-voltage circuit breaker (h.v.cb) cannot trip, and the dc working power supply without a trip circuit cannot supply the working power to a protection Relay (Relay), but it is late.

In the distribution board, in which the protection relay and the trip circuit of the breaker are installed, the working power of the protection relay can be both AC and DC to provide the required working power. In general, a DC power supply is preferred (only one of AC and DC is selected), because the DC power supply is generally stable and reliable.

The present inventor has already proposed and patented several proposals for improving the working power supply of the trip loop in the high-voltage distribution board of the high-voltage distribution system. Particularly, in the aspect of improvement of the capacitor trip device CTD, it is possible to test under load, there is an electricity meter displaying its voltage value, it is possible to effectively prevent the work safety accident prevention which may be caused by turning on a high voltage switchboard to a panel type, the capacitor trip device having a voltage comparison circuit and an alarm circuit can solve the problem that a capacitor may be attenuated due to time, there is a combination of a time circuit and a voltage comparison circuit, it is possible to simulate whether or not its trip loop operating power is sufficient to push its load device to isolate an accident every day or at a set time to simulate the accident occurrence, there is further a CTD of an automatic power conversion circuit to prevent the external power from being supported by ac and dc power when the capacitor trip device is out of order, and it is possible to solve the problems of voltage, capacitance and communication, and the above solutions are products in the current market. And a capacitor tripping device CTD with a standby power supply, a capacitor tripping device CTD with a direct-current energy-storage direct-current power supply, a capacitor tripping device CTD special for a high-voltage electromagnetic switch VCS, a capacitor tripping device CTD supporting a direct-current system and the like.

From the above, the working power supplies of the tripping circuit of the high-voltage breaker disc are basically divided into two categories, one is supplied by the direct current electric energy of the battery pack, and the other is supplied by the alternating current power supply. Generally, a capacitor tripping device CTD is added in an ac power supply system to serve as a working power supply for a high-voltage transformer tripping circuit of the system, because when a short-circuit accident occurs in a high-voltage system, the voltage of the transformer PT suddenly drops to zero, so that no effective working power supply is used in the tripping circuit, and a circuit breaker cannot trip a closed contact to isolate the accident. Generally, the trip circuit operating power supply can solve most problems when a dc battery tray or a capacitor trip device is used to store dc power. However, in special situations, such as natural disasters like earthquake, or careless loss of human factors, the trip circuit may be damaged or disabled, so that the circuit breaker cannot trip and isolate the accident point. For example, due to improper use of equipment, for example, UPS, the UPS fails due to the failure of the battery inside the UPS, which leads to many accident cases, and in practical cases, for example, a major power failure in a scientific park is caused by the fact that a dragon mountain substation is not isolated by an accident. The new Chinese Taiwan electric head sheave case causes explosion of a power plant and injuries and deaths of dozens of people due to improper operation of a control power supply and failure of tripping of a breaker to break an accident point; the importance of the working power supply of the trip loop and the urgency of improvement are described in the above practical cases, namely, the trip loop circuit is damaged due to an earthquake, the high-voltage circuit breaker does not trip, the cooling circulation system fails, and a nuclear disaster is caused. This creation is used for further improving circuit breaker trip circuit system promptly, promotes the stability of trip circuit power supply system.

The reason that the trip loop system of the high-voltage distribution system can be in failure is examined, and the components such as the transformer PT can be burnt because of 1. poor environment, too heavy moisture, 2. poor insulation (insulation deterioration, air gap and the like) of the transformer PT body, 3. animal invasion and the like, so that the transformer PT can be burnt; the reasons for the burning of the current transformer CT are 1, when a short-circuit accident occurs to a system, the burning of the secondary side is caused, 2, the environment is wet, 3, the insulation is poor, 4, the grounding fault is caused, and the like, so that the burning of the current transformer CT is caused; generally speaking, the secondary side of the current transformer CT must not be open-circuited to generate a high voltage and burn out the current transformer CT, so the secondary side of the CT must be connected in series with a load impedance to avoid an open circuit; generally speaking, the secondary side of the transformer PT must be connected to a load impedance in parallel to avoid short circuit, which may generate an excessive fault current and burn out the transformer PT. In general, the control power supply of the high-voltage ac system also uses the power supply on the secondary side of the transformer PT as the working power source of the trip circuit. In a high voltage system, a secondary side of a current transformer CT is a general current source electrically connected to a counter indicating current and a protection relay, a secondary side of a voltage transformer PT is a general voltage source electrically connected to a counter indicating voltage and a protection relay, and according to the fact that the electric energy is equal to the electric energy obtained by multiplying the voltage by the current (single phase) and multiplying three phases by √ 3 times, when an open-circuit current source of the secondary side of the current transformer CT approaches zero, a high voltage is generated between two ends, and otherwise, when a short-circuit voltage source of the secondary side of the voltage transformer PT approaches zero, a high current is generated between two ends. Therefore, when the system fails, the transformer PT or the transformer CT may have abnormal state power therein. In addition, the failure of the external power source, the disconnection of the circuit or the short circuit of the circuit, etc. all affect the working power source of the trip circuit.

The problem presented by the above-mentioned accident cases, whether it be a cause of a natural disaster or a human disaster, is that the trip system of its trip circuit is disabled and, in turn, a very large accident occurs. Therefore, under the existing structure, the structure of the switchboard, the set value of the protection relay, the structure of the breaker and the like can not be changed, and by means of the improved device of the trip loop system of the breaker, the function of the original trip loop system is enhanced, so that the safety function which can not be protected in the past is achieved. In summary, the control circuit mainly using dc power or ac power cannot effectively solve the actual situation in the field when the trip circuit of the high-voltage disk fails to work, so that an improved device for a circuit breaker trip circuit system can solve the above-mentioned problems and improve the safety and stability of the power distribution system.

SUMMERY OF THE UTILITY MODEL

Purpose(s) to

The utility model provides a high voltage alternating current system electric capacity trip improvement device, the working power supply device who has the trip return circuit improves in the enhancement, except having direct current state or the state of alternating current electric energy, perhaps direct current exchanges the mixed state that forms, under the circumstances of protection coordination is set for to the protection relay not changing original system protection originally, do not change the structure of original distribution board, and under the high voltage circuit breaker state of having stereotyped the experiment, with the electric energy on the system circuit, utilize the electric energy of voltage source and current source promptly, concatenate the internal contact action of protection relay, concatenate and drive circuit breaker's trip coil, form a complete trip return circuit system, and drive circuit breaker inside trip mechanism, make the circuit breaker actuate outage trip and isolation accident.

Means for solving the problems

To achieve the above object, the present invention provides an improved capacitor tripping device for a high voltage ac system, which is electrically connected to a power circuit; the electric circuit is provided with at least one trip coil for disconnecting the breaker of the electric circuit so as to link the trip mechanism of the breaker to disconnect the breaker; at least one voltage detection device arranged on the power circuit, wherein the voltage detection device comprises a voltage reduction unit for reducing output voltage; at least one current detection device arranged on the power circuit, wherein the current detection device comprises a current reduction unit for reducing output current; at least one protection relay arranged on the power loop, wherein the protection relay sets a protection electrical safety set value, such as at least one of values of current, grounding, voltage, frequency, temperature and the like, according to the state of a power system circuit; when the value of the detecting device is larger than the electrical safety set value, the relay is protected to be in actuation conduction, preferably the relay normally open contact is protected to be in actuation conduction; the utility model discloses a high voltage alternating current system electric capacity jumps and takes off improvement device includes: a main control substrate electrically connected to a trip loop power circuit, a power auto-alternating circuit, a capacitor energy storage circuit, a sensing device connection unit, an external device connection unit, and a status display unit; wherein the trip loop power circuit is at least electrically connected with the voltage reduction unit of the voltage detection device, the current reduction unit of the current detection device or an external support power supply; wherein the capacitor energy storage circuit is electrically connected with the trip loop power supply circuit to store proper direct current electric energy; the power supply automatic alternating circuit is electrically connected with the trip loop power supply circuit and the capacitance energy storage circuit, and the appropriate electric energy is output as the driving electric energy of the trip loop; the sensing device connecting unit at least comprises two items of current detecting device and voltage detecting device; the external equipment device connecting unit at least comprises a protective relay normally open contact, two ends of a tripping coil of a breaker or an external forced instruction contact; the state display unit can display the state of the whole system tripping loop in real time.

The utility model discloses a high pressure alternating current system electric capacity trip improvement device can be according to current source electric energy or voltage source electric energy, be direct current electric energy through the rectification, store direct current electric energy or external electric energy by the condenser again, provide trip drive electric energy through the automatic circuit in turn of power and concatenate protection relay normally open contact again, or protection relay normally open contact is again and outside compulsory instruction contact actuates and switches on, when the closed auxiliary contact action of circuit breaker switches on, the trip coil that drives this circuit breaker promptly breaks off the circuit breaker with the trip mechanism disconnection of this circuit breaker of interlock.

To achieve the above objects, the present invention provides another embodiment of an improved capacitor tripping device for a high voltage ac system, which is substantially similar to the previous embodiment, and is electrically connected to a power circuit; the electric circuit is provided with at least one trip coil for disconnecting the breaker of the electric circuit so as to link the trip mechanism of the breaker to disconnect the breaker; at least one voltage detection device arranged on the power circuit, wherein the voltage detection device comprises a voltage reduction unit for reducing output voltage; at least one current detection device arranged on the power circuit, wherein the current detection device comprises a current reduction unit for reducing output current; the protection relay is arranged on the power loop, sets a protection electrical safety set value of the protection relay according to the state of a power system line, such as at least one of current, grounding, voltage, frequency, temperature and the like, and when the value of the detection device is greater than the electrical safety set value, the normally open contact of the protection relay is actuated and conducted; the utility model discloses an aforementioned high voltage alternating current system electric capacity jumps improvement device includes: a main control substrate, which is electrically connected with an AC/DC conversion circuit, a trip loop power circuit, a capacitance energy storage circuit, a power automatic alternation circuit, a sensing device connection unit, an external equipment connection unit and a state display unit; the alternating current-direct current conversion circuit is electrically connected to the voltage reduction unit of the voltage detection device or externally connected with alternating current power, converts the alternating current power into direct current power and electrically connects the direct current power to the capacitor for energy storage; the trip loop power circuit is at least electrically connected with the voltage reduction unit of the voltage detection device, the current reduction unit of the current detection device or an external support power supply; the capacitor energy storage circuit is electrically connected with the trip loop power supply circuit to store proper direct current electric energy; the power supply automatic alternating circuit is electrically connected with the trip loop power supply circuit, and the capacitance energy storage circuit outputs proper electric energy as trip loop driving electric energy; the sensing device connecting unit at least comprises two items of current detecting device and voltage detecting device; the external equipment device connecting unit at least comprises a protective relay normally open contact, two ends of a tripping coil of a breaker or an external forced instruction contact; the state display unit can display the state of the system tripping loop; the utility model provides a high pressure alternating current system electric capacity trip improvement device can be according to current source electric energy or voltage source electric energy, be direct current electric energy through the rectification, again by condenser storage direct current electric energy or external electric energy, provide trip drive electric energy through the automatic circuit in turn of power and concatenate protection relay normally open contact again, or protection relay normally open contact again and connect outside mandatory command contact and actuate and switch on, the closed auxiliary contact of circuit breaker actuates when switching on, the trip coil of driving this circuit breaker breaks the circuit breaker with the trip mechanism disconnection of this circuit breaker of interlock.

Drawings

Fig. 1 is a schematic diagram of the wiring of the improved capacitor tripping device of the high voltage ac system of the present invention.

Fig. 2 is a schematic circuit diagram of a current detection device (current transformer) according to the present invention.

Fig. 3 is a schematic diagram of the trip circuit protection action of the trip circuit system of the current transformer of the present invention.

Fig. 4 is a diagram illustrating an architecture of a capacitor tripping improvement device of a high voltage ac system according to a first embodiment of the present invention.

Fig. 5 is a diagram illustrating a second embodiment of the improved capacitor tripping device for a high voltage ac system according to the present invention.

Symbolic illustration in the drawings:

1 capacitor tripping improving device of high voltage AC system; 10 circuit breakers; 11 a current detecting device; 12 a voltage detection device; 13 a trip mechanism; 14 circuit breaker closing auxiliary contacts; 15 tripping the coil; 16 protecting the normally open contact of the relay; 17 an external force command contact; 18 trip loop power supply circuit; 19 protecting the relay; 20 power supply automatic alternation circuit; 21 a sensing device connection unit; 22 an external device connection unit; 23 a status display unit; 24 DC external support unit; 25 AC external support unit; 28 control loop power supply; 30 a main control substrate; 180 a second ac-dc conversion circuit; 181 a first detection circuit; 182 a first display unit; 183 analog fault generation circuit; 184 a direct current-direct current conversion circuit; 185 DC power supply alternating circuit; 186 second detection circuitry; 187 a second display unit; 188. 189B switch contact; 190 a capacitive tank circuit; 191 the direct current power supply connects the output circuit in parallel; 192 a third detection circuit; 193 a third display unit.

Detailed Description

The utility model discloses the preferred embodiment that high voltage alternating current system electric capacity trip improvement device implemented, as shown in fig. 1, be equipped with a circuit breaker 10 in its electric power return circuit, this circuit breaker 10 has a trip coil 15, and this trip coil 15 links the trip mechanism 13 of this circuit breaker 10. A voltage detection device 12 (such as a voltage comparator) is disposed on the power circuit, the voltage detection device 12 includes a voltage reduction unit for reducing the output voltage; the voltage reduction unit is electrically connected to the protection relay 19 and the control loop power supply 28. A current detection device 11 (such as a current transformer) is also arranged on the power circuit, and the current detection device 11 comprises a current reduction unit for reducing the output current; the current reduction unit is electrically connected to the protection relay 19 and the control loop power supply 28, the control loop power supply 28 selects the corresponding power to be connected to the protection relay 19 in series through the power automatic alternation circuit 20 to connect the protection relay normally open contact 16. The protective relay 19 sets its protective electrical safety set value according to the line, load state and protective coordination requirement of the power system, when reaching the protective set value, the protective relay normally open contact 16 is actuated and conducted, and can be connected with remote intelligent forced power-off command contact 17, then connected with the circuit breaker closing auxiliary contact 14 in series, and then connected with the trip coil 15 of the circuit breaker 10 in series to form a trip loop system. This introduces the power of the current detecting device 11 (e.g. current transformer) and the power of the voltage detecting device 12 (e.g. voltage transformer), further improving the protection of the trip coil 15 of the circuit breaker 10 from being driven by sufficient power when an accident occurs.

Please refer to fig. 2 for further explanation of the principles of the present invention. As shown in the block diagram of fig. 2, which is an equivalent circuit diagram of a general current detection device (current transformer), the current of the current reduction unit of the current detection device 11 flows through a current meter 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 power source of the trip coil 15 of the circuit breaker 10, the present invention connects a side branch path in parallel to the current dropping unit of the current detecting device 11. When the power system is normal, the protection relay 19 does not operate, the internal protection relay normally open contact 16 is opened, and the breaker closing auxiliary contact 14 of the breaker 10 is in a conducting state, and no current flows through the side branch path. However, when the power system is in failure, the protection relay 19 operates the protection relay normally open contact 16 to conduct and the breaker closing auxiliary contact 14 to conduct, the side branch path is a complete loop conducting state, and the current of the current reducing unit of the current detecting device 11 (such as current transformer) passes through the side branch path, so that it can be used as the power required for driving the trip coil 15 of the breaker 10.

The technical features of the side branch path of the current reduction unit of the current detection device 11 (such as a current transformer) are combined with the design of the conventional circuit breaker trip power supply, as shown in fig. 3. The upper left block of the figure represents a battery pack BAT, a capacitive trip device CTD or an uninterruptible power system UPS as a trip power source for the trip coil 15 of the circuit breaker 10 in the prior art, which is usually sufficient to provide the driving power source required for the trip coil 15 of the circuit breaker 10 in the normal case. 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 accidents, and great harm is generated at this time. As can be seen from fig. 3, when a system fault (the normally open contact 16 of the protection relay is turned on) occurs, if the battery pack, the capacitor trip device or the uninterruptible power system in the prior art fails, the current in the power circuit still continues to pass through the circuit breaker 10, and thus the current source of the current reducing unit of the current detecting device 11 (such as the current transformer) still continues to flow (see fig. 2). At this time, the power source automatic alternation circuit 20 is switched to the loop of the current detection device 11 due to the incapability of the battery pack, the capacitance trip device or the uninterruptible power system in the prior art, and the current flows into the trip coil 15 of the circuit breaker 10 as shown by the dotted arrow to drive the trip mechanism 13 to operate, so that the closed main contact of the circuit breaker 10 can be cut off to isolate the accident point, the stability of the circuit breaker trip loop system is further improved, and the operation safety of the power system is ensured.

For different external support power sources, the design of the improved capacitor tripping device of the high-voltage alternating-current system is slightly different, and the present invention uses two embodiments of the direct-current and alternating-current external support power sources for description. Elements or blocks having the same function are denoted by the same reference numerals. As shown in fig. 4, which is a functional block diagram of a first embodiment of the present invention, the improved device 1 for capacitor tripping device of high voltage ac system has a DC input terminal connected to the DC external support unit 24 and an ac input terminal connected to the voltage reduction unit of the voltage detection device 12. The DC external support unit 24 is, for example, a battery pack, and serves as one of power sources required for the operation of the trip circuit of the circuit breaker. In addition, the voltage reduction unit of the voltage detection device 12 is connected to the ac input terminal, and is converted into a DC power through an ac/DC conversion circuit 184, the ac/DC conversion circuit 184 is generally a bridge rectifier filter, and the converted DC power and the power output from the DC external support unit 24 are connected to a DC power supply alternation circuit 185, and the DC power supply alternation circuit 185 preferentially selects the DC power output of the ac/DC conversion circuit 184 when the voltage reduction unit of the voltage detection device 12 is powered, so as to charge the capacitor energy storage circuit 190, and store the electric energy required by the trip circuit by using the capacitor. If the voltage reduction unit of the voltage detection device 12 is disabled, the DC power supply alternation circuit 185 selects the power supply of the DC external support unit 24 to charge the capacitor energy storage circuit 190. The dc power supply alternation circuit 185 may be implemented by a relay module of 2A2B1C or a switching module with the same function (not shown). The output power of the DC power supply alternating circuit 185 (i.e. the output power of the capacitor energy storage circuit 190) and the power of the DC external support unit 24 are simultaneously input to the DC power supply parallel output circuit 191, and the DC power supply parallel output circuit 191 takes the electric energy of the capacitor energy storage circuit 190 as the power required by the trip circuit to be preferentially provided. The dc power parallel output circuit 191 can be implemented by a relay module of 2A2B1C or a switching module with the same function (not shown). To facilitate the inspection of the status of the trip circuit power circuit 18, the outputs of the DC external support unit 24, the capacitor storage circuit 190, and the DC power parallel output circuit 191 may be respectively connected to a detection circuit and a display unit, such as a watch head, a seven-segment display, or other liquid crystal display panel (not shown). The detection circuit is provided with a voltage comparison circuit to judge whether the voltage is higher than a default value so as to carry out necessary warning.

As shown in the circuit diagram of the current detection device (current transformer) shown in fig. 2, the output of the side branch path and the dc power parallel output circuit 191 is connected to the power automatic alternation circuit 20, the power automatic alternation circuit 20 preferably selects the power from the dc power parallel output circuit 191, when the power of the dc power parallel output circuit 191 is disabled, the side branch path of the current reduction unit of the current detection device 11 is switched, the protection relay normally open contact 16 is turned on, the breaker closing auxiliary contact 14 is also turned on, and the current of the current detection device 11 flows through the side branch path to drive the trip coil 15 to actuate the trip mechanism 13, thereby isolating the accident point. Similarly, the power auto-alternation circuit 20 can be implemented by using a relay module of 2A2B1C or a switching module with the same function (not shown). The analog fault generation circuit 183 of fig. 4 is provided to facilitate testing of the operating state of the trip loop power supply circuit 18. In addition, the external force command contact 17 can receive an external command from a remote place to control the trip coil 15 of the circuit breaker 10.

Referring to fig. 5, which is a functional block diagram of a second embodiment of the present invention, the improved capacitor tripping device 1 of the high voltage AC system has an AC input terminal connected to the AC external support unit 25 and an AC input terminal connected to the voltage reduction unit of the voltage detection device 12. The AC external support unit 25 is, for example, an uninterruptible power system UPS, and may be used as one of power sources required for the trip circuit operation of the circuit breaker 10. It is converted into a dc power source through a second ac/dc conversion circuit 180, and the second ac/dc conversion circuit 180 is generally a bridge rectifier filter. The voltage reduction unit of the voltage detection device 12 is connected to an ac input terminal, and is converted into a dc power supply by an ac/dc conversion circuit 184, the ac/dc conversion circuit 184 is generally a bridge rectifier filter, and the converted dc power supply and the power output from the second ac/dc conversion circuit 180 are connected to a dc power supply alternation circuit 185, and the dc power supply alternation circuit 185 preferentially selects the dc power output of the ac/dc conversion circuit 184 when the voltage reduction unit of the voltage detection device 12 is powered, thereby charging the capacitor energy storage circuit 190 and storing the electric energy required for tripping the loop by using a capacitor. If the voltage reduction unit of the voltage detection device 12 is disabled, the dc power supply alternation circuit 185 selects the power output of the second AC/dc conversion circuit 180 rectified by the AC external support unit 25 to charge the capacitor energy storage circuit 190. The dc power supply alternation circuit 185 may be implemented by a relay module of 2A2B1C or a switching module with the same function (not shown). The output power of the dc power supply alternation circuit 185 (i.e. the output power of the capacitor energy storage circuit 190) and the output power of the second ac/dc conversion circuit 180 are simultaneously input to the dc power supply parallel output circuit 191, and the dc power supply parallel output circuit 191 takes the electric energy of the capacitor energy storage circuit 190 as the power supply required for preferentially providing the trip circuit. The dc power parallel output circuit 191 can be implemented by a relay module of 2A2B1C or a switching module with the same function (not shown). To facilitate the inspection of the state of the trip circuit power circuit 18, the outputs of the second ac/dc converter circuit 180, the capacitor energy storage circuit 190, and the dc power parallel output circuit 191 may be respectively connected to a detection circuit and a display unit, such as a watch head, a seven-segment display, or other liquid crystal display panel (not shown). The detection circuit is provided with a voltage comparison circuit to judge whether the voltage is higher than a default value so as to carry out necessary warning.

As shown in the circuit diagram of the current detection device (current transformer) shown in fig. 2, the output of the side branch path and the dc power parallel output circuit 191 is connected to the power supply automatic alternation circuit 20, the power supply automatic alternation circuit 20 preferably selects the power supply from the dc power parallel output circuit 191, when the power supply of the dc power parallel output circuit 191 is disabled, the side branch path of the current reduction unit of the current detection device is switched, the protection relay normally open contact 16 is turned on, the breaker closing auxiliary contact 14 is also turned on, and the current of the current detection device 11 flows through the side branch path to drive the trip coil 15 to actuate the trip mechanism 13, thereby isolating the accident point. Similarly, the power auto-alternation circuit 20 can be implemented by using a relay module of 2A2B1C or a switching module with the same function (not shown). The analog fault generation circuit 183 of fig. 4 is provided to facilitate testing of the operating state of the trip loop power supply circuit 18. In addition, the external force command contact 17 can receive an external command from a remote place to control the trip coil 15 of the circuit breaker 10.

No matter the first or second embodiment of the present invention, the analog fault generating circuit 183 is provided for testing the operation of the trip loop power supply, the analog fault generating circuit 183 may be a test button or a trigger cut-off signal connected to the microcontroller, and the analog fault generating circuit 183 may individually disconnect the connection state of the parallel output circuit connected to the dc power supply, and the cut-off

switch B contacts

188 and 189 may be implemented by a general relay module of 2A2B1C or a switching module with the same function (not shown).

The utility model discloses high-pressure alternating current system electric capacity jumps improvement device's embodiment one or two, is equipped with the outside compulsory instruction contact 17 of accepting for doing benefit to the state of each stand-by power supply of remote monitoring to conveniently carry out remote test. Remote control may be achieved, for example, by a serial communication module (e.g., a communication port such as RS485, RS422, or RS 232) that preferably cooperates with the microcontroller interface to perform transmission and reception of signals or control commands.

To sum up, the utility model discloses high-voltage alternating current system electric capacity jumps and takes off improvement device has further promoted the stability of circuit breaker trip loop system, possesses industry utilization deeply. The present invention discloses only the preferred embodiment, can not limit the scope of the right of the present invention, all the equivalent changes or modifications made according to the spirit of the present invention, still covered in the claims of the present invention.

Claims

1. A high-voltage AC system capacitance trip improved device is electrically connected with a power circuit, and the power circuit is provided with at least one trip coil for disconnecting the breaker of the power circuit so as to link the trip mechanism of the breaker to disconnect the breaker; a voltage detection device disposed on the power loop, the voltage detection device including a voltage reduction unit for reducing an output voltage; a current detection device disposed on the power loop, the current detection device including a current reduction unit for reducing output current; and a protection relay arranged on the power loop, wherein the protection relay sets a protection electrical safety set value according to the line state of the power system, and when the numerical value of the detection device is greater than the electrical safety set value, the protection relay is activated and conducted; it is characterized in that the preparation method is characterized in that,

the capacitor tripping improvement device of the high-voltage alternating current system comprises:

a trip loop power circuit electrically connected to at least the voltage reduction unit of the voltage detection device, the current reduction unit of the current detection device or an external support power;

a capacitor energy storage circuit electrically connected to the trip loop power circuit for storing appropriate DC power;

the power supply automatic alternating circuit is electrically connected with the trip loop power supply circuit and the capacitor energy storage circuit, and outputs proper electric energy as trip loop driving electric energy;

a sensing device connection unit, which at least comprises two items of detection of the current detection device and the voltage detection device;

an external equipment device connecting unit, which at least comprises a protective relay normally open contact, two ends of a tripping coil of a breaker or an external forced instruction contact;

a state display unit, which displays the state of the system tripping loop;

a main control substrate electrically connected to the trip loop power circuit, the capacitor energy storage circuit, the power supply automatic alternation circuit, the sensing device connection unit, the external device connection unit and the state display unit;

the capacitor tripping improved device of the high-voltage alternating-current system is rectified into direct-current electric energy according to current source electric energy or voltage source electric energy, the direct-current electric energy or external electric energy is stored by a capacitor, tripping driving electric energy is provided by a power supply automatic alternating circuit and then connected in series to protect a relay normally open contact, or the relay normally open contact is protected and then connected with an external forced instruction contact to be actuated and switched on, and when a breaker closing auxiliary contact is actuated and switched on, a tripping coil of the breaker is driven to link a tripping mechanism of the breaker to switch off the breaker.

2. The apparatus of claim 1, wherein the protection relay is based on the power system line, load condition and protection coordination requirements, and the protection electrical safety setting of the protection relay is set according to at least one of current, ground, voltage, frequency and temperature.

3. A high-voltage AC system capacitance trip improved device is electrically connected with a power circuit, and the power circuit is provided with at least one trip coil for disconnecting the breaker of the power circuit so as to link the trip mechanism of the breaker to disconnect the breaker; a voltage detection device disposed on the power loop, the voltage detection device including a voltage reduction unit for reducing an output voltage; a current detection device disposed on the power loop, the current detection device including a current reduction unit for reducing output current; and a protection relay arranged on the power loop, wherein the protection relay sets a protection electrical safety set value according to the line state of the power system, and when the numerical value of the detection device is greater than the electrical safety set value, the protection relay is activated and conducted; it is characterized in that the preparation method is characterized in that,

a main control substrate, which is electrically connected with an AC/DC conversion circuit, a trip loop power circuit, a capacitance energy storage circuit, a power automatic alternation circuit, a sensing device connection unit, an external equipment connection unit and a state display unit;

the alternating current-direct current conversion circuit is electrically connected to the voltage reduction unit of the voltage detection device or externally connected with alternating current electric energy, converts the alternating current electric energy into direct current electric energy, and electrically connects the direct current electric energy to the capacitor energy storage through the capacitor energy storage;

the trip loop power circuit is at least electrically connected with the voltage reduction unit of the voltage detection device, the current reduction unit of the current detection device or an external support power supply;

the capacitor energy storage circuit is electrically connected with the trip loop power circuit to store proper direct current electric energy;

the power supply automatic alternating circuit is electrically connected with the trip loop power supply circuit, and the capacitor energy storage circuit outputs proper electric energy as trip loop driving electric energy;

the sensing device connecting unit at least comprises more than two items of the current detection device and the voltage detection device;

the external equipment device connecting unit at least comprises a protective relay normally open contact, two ends of a tripping coil of a breaker or an external forced instruction contact;

the state display unit displays the state of the system tripping loop;

4. The apparatus of claim 3, wherein the protection relay is based on the power system line, load condition and protection coordination requirements, and the protection electrical safety setting of the protection relay is set according to at least one of current, ground, voltage, frequency and temperature.