CN111969565B - Improved device of high-voltage power-off tripping system of DC control circuit breaker - Google Patents

Abstract

The invention relates to an improved device of a high-voltage power-off tripping system of a direct-current control circuit breaker, which is a device for improving the high-voltage power safety in the conventional large-scale power distribution (transformation) station. The invention uses the electric energy of the current reducing unit of the current detecting device as the standby power supply of the tripping system to drive the tripping coil to make the tripping mechanism act to break the breaker.

Description

Improvement device of DC control circuit breaker high-voltage power-off tripping system

technical field

The invention is an improved device for the high-voltage power-off tripping system of a DC control circuit breaker, especially the improvement of the power receiving (distribution) substation that is generally used as the main control loop in the high-voltage large-scale power distribution (substation) station in the past. Station, when there is a problem with the DC power supply system, there is a doubt that the accident cannot be isolated when the accident occurs.

Background technique

In large-scale high-voltage receiving (distribution) power stations, in order to stabilize the power supply system, if the funds are sufficient and the space permits, the owner will choose the control power supply of the receiving (distribution) system to be assembled with a large battery pack The battery is used as the power supply device. Generally speaking, a power supply system composed of battery packs is a more appropriate power supply method. For example, China Taiwan Power Company (TPC) for high-voltage (above 36KV) supply and reception (distribution) power stations, the control power supply method for its circuit breakers is mainly DC supply, and generally uses battery packs for power supply to protect them. (Distribution) the stability of the power supply system.

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 cannot be tripped immediately when a short-circuit accident occurs in a certain business unit (receiver), it will cause damage to the high-voltage circuit breaker (H.V.CB), and extend to affect the power supply of the main power supply trunk to other Public institutions (receivers), causing chain industrial losses. Whether the high-voltage circuit breaker can trip in time is controlled by whether the protection relay (Relay) can issue instructions in real time. Therefore, when there is a problem with the working power supply of the protection relay, the protection relay will not operate; when the protection relay will not operate, the high-voltage CB will not operate when the accident occurs, and the accident of the public institution cannot be isolated point, causing serious secondary accidents, and even affecting the tripping of the power supply feeder, it must not be careless. Since such high-risk industrial safety incidents often cause accidents due to misjudgment, the main power supply company (such as China Taiwan Power Company) prevents the circuit breaker from tripping due to a sudden voltage drop in case of a short-circuit accident. And due to the slow action of the current counter saturation, it is required that the public institution must set up a protection system in accordance with the regulations before allowing power supply. The main regulations are: when using the secondary side power supply of the voltage comparator, it should be supplemented by a capacitor trip device (CTD) or supplemented by a capacitor trip device and then connected to the uninterruptible power system (UPS), and the power supply electronic or digital Capacitor Trip Devices (CTDs) are not intended for use with circuit breakers or other equipment. This is ideal, but accidents often come from ideal conditions. In practice, uninterruptible power systems (UPS) will almost always fail due to battery aging after one or two years. If a battery pack-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 was found that the DC working power supply without a trip circuit could not supply working power to the protection relay (Relay), but it was too late.

In view of the above factors, when the DC power supply of the battery pack fails, if an accident occurs in the system during this period (no matter what the accident is), such as CO, LCO, UV, OV, etc., the isolation of the accident point The circuit breaker will cause the high-voltage panel (also known as the power distribution cabinet) to fail due to the failure of the working power supply (DC power supply of the battery pack) that it supplies to the trip circuit. When the system fails, the trip circuit has no working power and cannot isolate the accident. point of seriousness.

In a system that already uses a DC battery pack as the control power supply, a single DC battery pack can be used to provide DC power or two sets of DC battery packs can support each other to provide DC power as the DC power supply for the overall power distribution system. In the actual switchboard, the protective relay and the trip circuit of the circuit breaker, the working power of the protective relay is generally available in both AC and DC to provide the required working power. In general, the DC power supply will be given priority (only one of AC and DC can be selected), because generally speaking, the DC power supply is relatively stable and reliable, so the DC power supply system based on battery packs is generally used as the customer’s The favorite option, where space and economy permit.

In the actual state, it is the characteristics of the battery pack equipment itself. It will be worn out and aged within one to two years, and there may be doubts about failure. Even some unpredictable situations may occur between the entire control circuit, making the system jump When the working power supply of the off-circuit is disabled, it is like using an AC power supply (AC source) as the working power of the tripping control loop; in order to prevent accidents, due to a sudden drop in voltage, if the DC power supply fails again, it may cause Failure to activate the protective relay will cause an accident. In order to prevent the above from happening, a control circuit that can provide DC power to avoid accidents that may occur when the power is disabled, and the DC control circuit breaker high-voltage power-off tripping system improvement device is one of the methods that can solve the above problems .

The applicant of the present invention has already proposed several proposals and applied for a patent for the improvement of the working power supply of the trip circuit in the high-voltage switchboard in the high-voltage power distribution system. Especially in the improvement of the capacitor tripping device CTD, it can be tested under load, with an ammeter displaying its voltage value, to a panel type that can effectively prevent industrial safety accidents that may be caused by opening 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. With the combination of the time circuit and the voltage comparison circuit, it can be used every day or set the time to simulate whether the working power of the tripping circuit is sufficient when an accident occurs. Promote its load equipment to isolate accidents, further have CTD of automatic power conversion circuit to prevent capacitor tripping device failure, external power supply has AC and DC power supply support, and can solve voltage and capacitance and communication problems, as well as DC The DC capacitor tripping device is used to control the tripping of the circuit breaker. The above solutions are the products in the current market.

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 plate to fail, the actual situation faced in the field has not been able to effectively solve this problem in the past. Therefore, from the actual needs of the situation in the field, the improved device of the DC control circuit breaker high-voltage power-off tripping system can solve the above problems, and at the same time improve the safety and stability of its power distribution system.

Contents of the invention

Purpose

The invention provides an improved device for a high-voltage power-off tripping system of a DC control circuit breaker, which can effectively solve the accident in the market that mainly uses a DC power supply as a working power source for a tripping circuit. Generally, the battery pack is used as the main energy storage method, and there is only a single protection. Therefore, in the control circuit mainly based on DC power supply, the improved device of the DC control circuit breaker high-voltage power-off tripping system of the present invention can be installed without changing In the case of protection coordination set by the original system protection relay, without changing the structure of the original switchboard, and under the state of the high-voltage circuit breaker that has been type-tested, the secondary side of the original voltage ratio PT in the original power system The voltage source and the current source on the secondary side of the current transformer CT are connected in series with the normally open contact of the protection relay, and then connected in series with the tripping coil of the circuit breaker, so as to link the internal tripping mechanism to disconnect the circuit breaker, so as to improve previous questions.

technical means to solve problems

In order to achieve the above object, the present invention provides an improved device for the high-voltage power-off tripping system of a DC control circuit breaker, which is electrically connected with a power circuit. The power circuit has at least one tripping coil for disconnecting the circuit breaker of the power circuit, so as to link the tripping mechanism of the circuit breaker to disconnect the circuit breaker. The improved device of the DC control circuit breaker high-voltage power-off tripping system of the present invention preferably includes: selectively setting a voltage detection device on the power circuit, and the voltage detection device includes a step-down device for reducing the output voltage pressure unit. The present invention mainly includes a current detection device arranged on the power circuit, the current detection device includes a current reduction unit for reducing the output current; a protection relay arranged on the power circuit, the protection relay is based on Power system line status, set at least one protection electrical safety setting value, such as current, grounding, voltage, frequency, temperature and other values, when the value of the current detection device is greater than the electrical safety setting value, the protection The normally open contact of the relay is turned on. The above-mentioned present invention also includes: a tripping loop power supply circuit, the tripping loop power supply circuit is at least electrically connected to the DC system power supply, the current reduction unit of the current detection device or an external support power supply, and can also be connected to the voltage detection device if necessary. Buck unit. Optionally, an automatic power alternation circuit is provided. The automatic power alternation circuit is electrically connected to the trip loop power supply circuit. The power automatic alternation circuit outputs appropriate electric energy as the electric energy for driving the trip coil of the trip circuit. Furthermore, a capacitive energy storage circuit is provided, which is electrically connected to the trip circuit power supply circuit to store appropriate DC electric energy. The invention sets the circuit according to the power loop system line, load state, system protection coordination requirement and sequence control protection. The aforesaid protection setting circuit activates the conduction contact, and can be connected in parallel with the remote intelligent forced power-off command contact according to requirements. The present invention further provides a sensing device connection unit, the sensing device connection unit preferably includes a current detection device, of course, a voltage detection device can also be selected as the sensing device if necessary. The present invention is provided with an external equipment device connection unit, the external equipment device connection unit at least includes a normally open contact of a protection relay, both ends of a tripping coil of a circuit breaker or a remote intelligent forced power-off command contact; a contact state display unit, the The contact state display unit can display the state of the system tripping circuit; the improved device of the DC control circuit breaker high-voltage power-off tripping system of the present invention can automatically alternate the circuit through the power supply according to the electric energy of the DC power supply, the electric energy of the voltage source, the electric energy of the current source or the external electric energy. Provide tripping driving power and then connect the normally open contact of the protection relay in series, or connect the normally open contact of the protection relay in parallel with the remote intelligent forced power-off command contact, and connect the closing auxiliary contact of the circuit breaker in series, and then connect the circuit breaker in series Trip coils to form a trip loop system. When the normally open contact of the protection relay or the remote intelligent forced power-off command contact is turned on, and the closed auxiliary contact of the circuit breaker connected in series is turned on, the tripping coil of the circuit breaker is controlled by the power supply circuit of the tripping circuit. The power of the current reducing unit of the power or current detection device is actuated to drive the tripping mechanism of the circuit breaker to disconnect the circuit breaker.

In order to achieve the above object, the present invention also provides an improved device similar to the above-mentioned DC control circuit breaker high-voltage power-off tripping system, which is electrically connected with a power circuit. The power circuit has a tripping coil for disconnecting the circuit breaker of the power circuit, so as to link the tripping mechanism of the circuit breaker to disconnect the circuit breaker. The improved device for the DC control circuit breaker high-voltage power-off tripping system includes: a voltage detection device arranged on the power circuit, which can be optionally installed when necessary, and the voltage detection device includes a step-down device for reducing the output voltage pressure unit. The improved device of the DC control circuit breaker high-voltage power-off tripping system of the present invention also includes a current detection device arranged on the power circuit, and the current detection device includes a current reduction unit for reducing the output current; The protection relay on the power circuit, which sets at least one protection electrical safety setting value according to the state of the power system line, such as current, grounding, voltage, frequency, temperature, etc., when the current detection device When the value is greater than the electrical safety setting value, the normally open contact of the protection relay is activated and turned on; a tripping loop power supply circuit is electrically connected to the DC system power supply, the current detection device's current reduction unit, and the voltage detection device's reduction unit. Voltage unit or external support power supply; an AC-DC conversion circuit, the AC-DC conversion circuit is electrically connected to the step-down unit of the voltage detection device, or external AC power is connected to convert AC power into DC power, and store energy with a capacitor Electrically connecting DC power to capacitor energy storage; a power automatic alternating circuit electrically connected to the power circuit of the trip circuit, and the automatic power supply circuit uses appropriate power output as electric energy for driving the trip coil of the circuit breaker; and A capacitive energy storage circuit is electrically connected to the trip loop power supply circuit to store appropriate DC power. The circuit is set according to the power circuit system line, load status, system protection coordination requirements and sequence control protection. The actuation contact of the protection setting circuit can be connected in parallel with the remote intelligent forced power-off command contact according to the demand. The aforesaid DC control circuit breaker high-voltage power-off tripping system improvement device also includes: a sensing device connection unit, the sensing device connection unit includes at least two or more sensing devices such as a current detection device and a voltage detection device; an external The equipment connection unit at least includes a protection relay normally open contact, both ends of the trip coil of the circuit breaker or a remote intelligent forced power-off command contact; and a contact status display unit, which can display the status of the system trip circuit. The improved device of the DC control circuit breaker high-voltage power-off tripping system of the present invention can be based on the power source of DC power supply, voltage source power, current source power or external power source, and the trip driving power is provided by the power automatic alternating circuit, and then the protection power 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 remote intelligent forced power-off command contact, and the closing auxiliary contact of the circuit breaker is connected in series, and then the trip coil of the 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 turned on, and the auxiliary contact of the circuit breaker is turned on, the tripping coil of the circuit breaker is detected by the electric energy or current of the tripping loop power supply circuit. The electric energy of the down-current unit of the measuring device is actuated to drive the tripping mechanism of the circuit breaker to disconnect the circuit breaker.

Description of drawings

Fig. 1 is a schematic wiring diagram of the improved device of the high-voltage power-off tripping system of the DC control circuit breaker of the present invention.

FIG. 2 is a schematic diagram of a current detection device (current comparator).

Fig. 3 is a schematic diagram of the trip circuit action of the improved device of the high-voltage power-off trip system of the DC control circuit breaker of the present invention.

Fig. 4 is a schematic diagram of the structure of the improved device of the high-voltage power-off tripping system of the DC control circuit breaker of the present invention.

Explanation of symbols in the accompanying drawings:

1 DC control circuit breaker high-voltage power failure tripping system improvement device; 10 circuit breaker; 11 current detection device; 12 voltage detection device; 13 trip mechanism; 14 circuit breaker closed auxiliary contact; 15 trip coil; relay normally open contact; 17 remote intelligent forced power-off command contact; 18 trip circuit power supply circuit; 19 protection relay; 20 automatic power supply alternate circuit; 21 sensing device connection unit; unit; 24 battery unit; 28 control circuit power supply; 181 first detection circuit; 182 first display unit; 183 analog fault circuit; 184 AC-DC conversion circuit; The second display unit; 188, 189 switch B contacts; 190 capacitor energy storage circuit; 191 DC power supply parallel output circuit; 192 third detection circuit; 193 third display unit.

detailed description

The preferred embodiment of the improved device for the high-voltage power-off tripping system of the DC control circuit breaker of the present invention is implemented, as shown in FIG. The tripping coil 15 links the tripping mechanism 13 of the circuit breaker 10; a voltage detection device 12 (such as a voltage comparator) is provided on the power circuit, 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 control circuit power supply 28 . A current detection device 11 (such as a current comparator) is also provided on the power circuit, and the current detection device 11 includes a current reduction unit for reducing the output current; the current reduction unit is electrically connected to the protection relay 19 and the control The loop power supply 28 , the control loop power supply 28 selects the corresponding electric energy through the power supply automatic alternation circuit 20 and is serially connected to the protection relay 19 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 turned on and can be Connect the remote intelligent forced power-off command contact 17, then connect the circuit breaker closed auxiliary contact 14 in series, and then connect the trip coil 15 of the circuit breaker 10 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 15 of the circuit breaker 10 when an accident occurs. Driven with sufficient electrical energy to isolate accidents.

Please refer to FIG. 2 for further description on the principle of the present invention. The block diagram in FIG. 2 is a schematic diagram of a general current detection device (current comparator). The current of the current reduction 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 comparator) as the power supply of the tripping coil 15 of the circuit breaker 10, the present invention connects a side branch path in parallel to the current reduction unit of the current detection device 11. When the side branch path is normal in the power system, the protection relay 19 is not in action, the internal protection relay normally open contact 16 is open, and the circuit breaker closing auxiliary contact 14 of the circuit breaker 10 is in a conducting state, and there is no current at this time Flow through side branch pathways. But when the power system is faulty, the protection relay 19 acts. The normally open contact 16 of the protection relay is turned on and the auxiliary contact 14 of the circuit breaker is also turned on. The side branch path constitutes a complete loop conduction state, and the current detection device 11 The current of the down-flow unit (such as a current comparator) passes through the side branch path, so it can be used as the power required for driving the tripping coil 15 of the circuit breaker 10 .

Combining the technical characteristics of the side branch path of the current detection device 11 (such as a current comparator) with the design of the used circuit breaker to trip the power supply, please refer to FIG. 3 . The block on the upper left of Fig. 3 shows that the tripping power supply of the tripping coil 15 of the circuit breaker 10 is used as the battery unit 24 in the capacitor tripping device of the DC system, which is usually enough to provide the tripping of the circuit breaker 10 under normal circumstances. The drive power required for the coil 15. But when the battery unit 24 is disabled due to human negligence, natural disasters, or expiration, it will not be able to drive the tripping coil 15 to isolate the accident, which will cause great harm. Such as integrating the technical characteristics of the current source of the current reducing unit introduced into the current detection device 11 (such as a current comparator), it can be seen from Figure 3 that when the system fails (the protection relay normally open contact 16 is turned on), if the technology When the battery unit 24 fails, the current of the power circuit still continues to pass through the circuit breaker 10, so the current source of the current detection device 11 (such as a current comparator) still continues to flow through the current source of the current reducing unit (see FIG. 2 Show). At this time, the power supply automatic alternation circuit 20 is switched to the circuit of the current detection device 11 due to the failure of the battery unit 24 of the prior art, and the current flows into the tripping coil 15 of the circuit breaker 10 as shown by the dotted arrow to drive the tripping circuit. The tripping mechanism 13 is actuated, so the closed main contact of the circuit breaker 10 can be cut off to isolate the accident point, which further improves the stability of the circuit breaker tripping circuit system to ensure the safety of the power system operation.

According to the aforementioned principles, a preferred embodiment of the improved device for the high-voltage power-off tripping system of the DC control circuit breaker of the present invention is shown in Figure 4. The improved device 1 for the high-voltage power-off tripping system of the DC control circuit breaker has a battery unit 24 The DC input terminal of the DC input terminal and the AC input terminal of the step-down unit connected to the voltage detection device 12 . The battery unit 24 serves as the power source required for circuit breaker trip circuit operation. In addition, the step-down unit of the voltage detection device 12 is connected to the AC input terminal, and is converted into a DC power supply through an AC-DC conversion circuit 184. The AC-DC conversion circuit 184 is generally a bridge rectifier filter, and the converted DC power supply can be used as The power required by the circuit, or the power output from the battery unit 24, is simultaneously connected to a DC power supply alternate circuit 185, and the DC power supply alternate circuit 185, when the step-down unit of the voltage detection device 12 has power, preferably selects the AC power supply alternate circuit 185. The DC power output of the DC conversion circuit 184 is 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 fails, the DC power alternation circuit 185 selects the power source of the battery 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 supply alternating circuit 185 (that is, the output power of the capacitor energy storage circuit 190 ) and the power supply of the battery unit 24 are input to the DC power parallel output circuit 191 at the same time, and the DC power parallel output circuit 191 uses the capacitor energy storage circuit 190. Electric energy is used as the priority to provide the power required for tripping the circuit. The DC power supply parallel output circuit 191 can usually be achieved by using a 2A2B1C relay module or a switching module with the same function (not shown). And for the convenience of checking the state of the tripping loop power supply circuit 18, the output of the battery unit 24, the capacitor energy storage circuit 190, and the DC power supply parallel output circuit 191 can be connected to the detection circuit and the display unit respectively, such as a gauge head and a seven-segment display or other LCD panels (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.

In the schematic diagram of the current detection device shown in FIG. 2 , the side branch path and the output of the DC power parallel output circuit 191 are connected to the power automatic alternation circuit 20, and the power automatic alternate circuit 20 preferably selects the output from the DC power parallel output circuit 191. Power supply, when the power supply of the DC power supply parallel output circuit 191 fails, it is switched to the side branch path of the current reduction 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 circuit breaker is closed. When it is turned on, the current of the down-current unit of the current detection device 11 flows through the side branch path to drive the tripping coil 15 to activate the tripping mechanism 13 and isolate the accident point. Similarly, the power supply automatic 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 generation circuit 183 in FIG. 4 is used to test the working state of the tripped loop power supply circuit 18 conveniently. In addition, the remote intelligent forced power-off command contact 17 can accept remote external commands for remote control of the tripping coil 15 of the circuit breaker 10. The remote control can be, for example, through a serial communication module (such as RS485, RS422 or RS232 and other communication ports) To achieve this, the serial communication module is preferably combined with the microcontroller interface to execute the transmission and reception of signals or control commands.

To sum up, the improved device of the DC control circuit breaker high-voltage power-off tripping system of the present invention introduces the electric energy of the down-flow unit of the current detection device as the backup power supply of the tripping system to drive the tripping coil to make the tripping mechanism trip. Opening the circuit breaker can safely break the circuit and isolate the accident when the power supply of the tripping circuit is disabled in the past, which is safe and reliable and can enhance the quality of its power supply. The invention further improves the stability of the circuit breaker trip circuit system and has deep industrial applicability.

What is disclosed in the present invention is only a preferred embodiment of the present invention, which cannot limit the scope of rights of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention are still covered in the scope of patent application of the present invention .

Claims (3)

1. An improved device for a high-voltage power-off tripping system of a DC control circuit breaker, which is electrically connected to a power circuit, and the power circuit has at least one tripping coil for disconnecting the circuit breaker of the power circuit, so as to be linked The tripping mechanism of the circuit breaker disconnects the circuit breaker; it is characterized in that the improved device for the high-voltage power-off tripping system of the DC control circuit breaker includes: A current detection device arranged on the power circuit, the current detection device includes a current reduction unit for reducing the output current; A protection relay installed on the power circuit, the protection relay is set according to the power system line, load status and protection coordination requirements, and according to at least one of current, grounding, voltage, frequency and temperature, and its protection electrical safety is set Setting value, when the value of the current detection device is greater than the electrical safety setting value, the normally open contact of the protection relay is actuated and turned on; A tripping loop power supply circuit, the tripping loop power supply circuit is at least electrically connected to a DC system power supply, the current reducing unit of the current detection device or an external supporting power supply; An automatic power supply alternating circuit, the automatic power supply alternating circuit is electrically connected to the trip circuit power supply circuit, and the automatic power supply circuit outputs appropriate electric energy as the electric energy for driving the trip coil of the circuit breaker by the trip circuit; A capacitive energy storage circuit, the capacitive energy storage circuit is electrically connected to the trip loop power supply circuit to store appropriate DC power; A sensing device connection unit, the sensing device connection unit at least includes the sensing device of the current detection device; An external equipment device connection unit, the external equipment device connection unit at least includes a protection relay normally open contact, both ends of the tripping coil of the circuit breaker or an external mandatory command conduction contact; A contact state display unit, the contact state display unit displays the state of the system tripping circuit; The improved device of the DC control circuit breaker high-voltage power-off tripping system is based on the power of the DC power supply, the power of the current source or the external power, and provides the driving power for tripping through the automatic alternating circuit of the power supply, and then connects the normally open contact of the protection relay in series, or the protection power The relay normally open contact is then connected in parallel with the remote intelligent forced power-off command contact, and the auxiliary contact of the circuit breaker is connected in series, and then the trip coil of the circuit breaker is connected in series to form a trip circuit system. The protection relay normally open contact or The remote intelligent forced power-off command contact is turned on, and when the circuit breaker is closed and the auxiliary contact is turned on, the tripping coil of the circuit breaker is actuated by the electric energy of the trip circuit power circuit or the electric energy of the current detection device, to drive the trip mechanism of the circuit breaker to open the circuit breaker. 2. An improved device for a high-voltage power-off tripping system of a DC control circuit breaker, which is electrically connected to a power circuit, and the power circuit has at least one tripping coil for disconnecting the circuit breaker of the power circuit, so as to connect The tripping mechanism of the circuit breaker is activated to disconnect the circuit breaker; it is characterized in that the improved device for the DC control circuit breaker high-voltage power-off tripping system includes: A voltage detection device arranged on the power circuit, the voltage detection device includes a step-down unit for reducing the output voltage; A current detection device arranged on the power circuit, the current detection device includes a current reduction unit for reducing the output current; A protection relay installed on the power circuit, the protection relay sets its protection electrical safety setting value according to the state of the power system line, when the value of the current detection device is greater than the electrical safety setting value, the The normally open contact of the protection relay is actuated and turned on; A trip loop power supply circuit, the trip loop power supply circuit is at least electrically connected to a DC system power supply, the current drop unit of the current detection device, the drop voltage unit of the voltage detection device or an external support power supply; An AC-DC conversion circuit, the AC-DC conversion circuit is electrically connected to the step-down unit of the voltage detection device to convert AC power into DC power, and store the DC power with a capacitive energy storage circuit; An automatic power alternation circuit, the automatic power alternation circuit is electrically connected to the trip loop power supply circuit, and the power automatic alternation circuit outputs appropriate electric energy as the electric energy for driving the trip coil of the trip circuit; The capacitive energy storage circuit is electrically connected to the trip loop power supply circuit to store appropriate DC power; A sensing device connection unit, the sensing device connection unit at least includes the sensing device of the current detection device; An external equipment device connection unit, the external equipment device connection unit at least includes a normally open contact of a protection relay, both ends of the tripping coil of the circuit breaker or a remote intelligent forced power-off command contact; A contact state display unit, the contact state display unit displays the state of the system tripping circuit; The improved device of the DC control circuit breaker high-voltage power-off tripping system is based on the power source of DC power supply, voltage source power, current source power or external power capacitor. The normally open contact of the relay, or the normally open contact of the protection relay is connected in parallel with the remote intelligent forced power-off command contact, and the auxiliary contact of the circuit breaker is connected in series, and then the trip coil of the 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 turned on, when the circuit breaker is closed and the auxiliary contact is activated and turned on, the tripping coil of the circuit breaker will use the electric energy of the tripping circuit power circuit or the The electric energy of the current detection device is actuated to drive the tripping mechanism of the circuit breaker to disconnect the circuit breaker. 3. The improved device for the DC control circuit breaker high-voltage power-off tripping system as claimed in claim 2, wherein the protection relay is based on the power system line, load status and protection coordination requirements, and the protection of the protection relay The electrical safety setting value is set according to at least one of current, grounding, voltage, frequency, and temperature.

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