TWI693763B - Improvement of dc control circuit breaker tripping system - Google Patents

Abstract

The invention relates to an improved device for a DC control circuit breaker tripping system, in particular to improve a conventional power distribution station in a large-scale power distribution (substation) station, generally using a battery pack power supply as a main control loop. The DC power supply system has a problem, and there is a doubt that the accident cannot be isolated when the accident occurs. The improved device of the DC control circuit breaker tripping system of the present invention introduces the secondary energy of the current detecting device as the backup power source of the tripping system. The coil is disconnected and the tripping mechanism is operated to open the circuit breaker. Under the condition that the previous tripping loop power supply is disabled, the safety trip can be tripped to isolate the accident, and the power supply quality can be enhanced by safety and reliability.

Description

Improved device for DC control circuit breaker power-off tripping system

The present invention is an improved device for DC control circuit breaker power-off tripping system, especially to improve the conventional large-scale power distribution (transformation) station, which generally uses battery pack power supply as the main control loop for receiving (distribution) electrical substation. There is a problem with the DC power supply system, and there is a concern that the accident cannot be isolated when the accident occurs. The improved device of the DC control circuit breaker power-off trip system of the present invention introduces the power of the current detection device current-reduction unit as the backup power source of the trip system to drive The tripping coil causes the tripping mechanism to act to open the circuit breaker, which can safely disconnect the tripping and isolate the accident under the condition that the power supply of the tripping circuit is disabled in the past, and the safety and reliability can enhance the quality of its power supply.

In large power receiving (distribution) power stations, in order to ensure the stability of the power supply system, under sufficient financial conditions and space permitting conditions, the owner will choose their power receiving (distribution) system whose control power is assembled with large battery packs Battery powered equipment. Generally speaking, a power supply system composed of battery packs is a more appropriate power supply method. In particular, the Taiwan Power Company (TPC) provides high-voltage (above 36KV) power supply and distribution (distribution) power stations, and its circuit breaker control power supply is mainly DC supply, and generally uses battery packs to protect its power supply (distribution). ) The stability of the electric power supply system.

High voltage circuit breaker (H.V.CB) or extra high voltage CGIS or GIS, is to receive protection The relay (Relay) command is used as whether to trip the high-voltage circuit breaker to isolate the source of the accident. Therefore, if the circuit breaker cannot be tripped immediately when a short-circuit accident occurs in a certain business unit (receiver) as scheduled, it will cause damage to the high-voltage circuit breaker (HVCB) and extend to affect the main power supply line to supply power to other businesses Units (receivers), causing chain-like industrial losses. Whether the high-voltage circuit breaker can be tripped in time is controlled by whether the protection relay (Relay) can issue an immediate command. Therefore, when there is a problem with the working power supply of the protection relay, the protection relay will not operate; when the protection relay will not operate, the high-voltage CB will not operate when an accident occurs, and the accident of the business unit cannot be isolated Point, causing serious secondary accidents and even affecting the feeder tripping of Taipower! Don't be careless. Due to this high-risk industrial safety incident, accidents often occur due to misjudgment, so the power supply line operator (Taiwan Power Company), in order to prevent the relay from being short-circuited, cannot trigger the circuit breaker trip due to the sudden voltage drop, and The saturable slow action of the flow device requires the public institution to set up a protection system in accordance with the regulations before it is allowed to supply power. The main provisions are: when the secondary side power supply of the sampling and voltage regulator is supplemented by a capacitor trip device (CTD) or a capacitor trip device and then connected to a continuous power system (UPS), and the power supply type or The capacitor tripping device (CTD) used in digital relays shall not be connected to circuit breakers or other equipment. This is ideal, but accidents often come from ideal conditions. In practice, the uninterruptible power system (UPS) will almost always fail due to battery aging after one or two years. If the DC power supply system mainly uses battery packs, the battery may be disabled after one year, but the business unit will not be aware of it. Usually, when there is a short circuit accident, it is found that the high voltage circuit breaker (HVCB) will not trip. It was found that the DC working power supply without tripping circuit could not supply the working power supply to the protection relay (Relay), but it was too late.

In view of the above factors, if the DC power supply of the battery pack is disabled, during this period, if the system has an accident (whether it is any accident), such as CO, LCO, UV, OV, etc., it will isolate the accident Point circuit breaker, because it supplies the circuit breaker When the working power supply (the DC power supply of the battery pack) is disabled and will cause the high-voltage disk to fail in the system, the trip circuit has no working power supply and cannot isolate the serious situation of the accident point.

In a conventional system that uses a DC battery pack as a 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 a DC power supply for the overall power distribution system. In the actual switchboard, the protection relay and the tripping circuit of the circuit breaker, the working power of the protection relay is generally AC and DC can be used to provide the required working power. Under normal circumstances, DC power is the priority (only one of AC and DC can be selected). Generally speaking, DC power is relatively stable and reliable, so the DC power supply system mainly based on battery packs is the customer's favorite Options, where the place and economy allow.

The actual state is the characteristics of its battery pack equipment. It will wear out and age in one to two years, and there is the possibility of disability. Even unpredictable conditions may occur between the entire control circuit, making the system When the working power supply of the de-loop circuit is disabled, it is generally like using an AC power source as the working power source of the trip control circuit; in order to prevent accidents, because of the sudden voltage drop, if the DC power supply is disabled, it may be The occurrence of an accident that cannot activate the protective relay. In order to prevent the above situation from happening, an accident that may occur when the control circuit that can provide DC power is disabled, and an improved device for the DC control circuit breaker power-off and trip system can solve one of the above problems.

The applicant of the present invention has proposed and applied for several schemes for the improvement of the working power of the trip circuit in the high-voltage distribution board of the high-voltage distribution system. Especially in the improvement of the CTD of the capacitor tripping device, from the test under load, the meter displays its voltage value, and the panel type can effectively prevent the prevention of industrial safety accidents that may be caused by opening the high-voltage switchboard. The capacitor tripping device of the voltage comparison circuit and the alarm circuit can solve the problem that the capacitor will decay with time. There is a combination of the time circuit and the voltage comparison circuit, which can simulate the accident when the accident occurs. Whether it is enough to promote its load equipment to isolate the accident, and there is a CTD of automatic power conversion circuit to prevent the failure of the capacitor trip device, the external power supply is supported by AC and DC power supply, and can solve the problems of voltage, capacitance and communication, And DC control circuit breaker tripping uses DC capacitor tripping device, the above solution is a product of the current market.

In summary, when the control circuit based on DC power or AC power is used in the trip circuit of the high-voltage disk and the electrical energy is disabled, the actual situation in the field is faced. In the past, this problem could not be effectively solved. Therefore, from the actual needs in the field, the improved device of the DC control circuit breaker power-off tripping system can solve the above problems, and at the same time improve the safety and stability of its power distribution system.

An improved device for DC controlled circuit breaker power-off and tripping system, which can effectively solve the market because DC power is mainly used as the working power of the trip circuit. Generally, the battery pack is used as the energy storage method, and there is only a single protection. The control circuit mainly based on DC power supply is equipped with the improved device of the DC control circuit breaker power-off and trip system. Without changing the protection coordination set by the original system protection relay, without changing the structure of the original switchboard and the state of the high-voltage circuit breaker that has been type-tested, the voltage divider PT in the original power system is secondary The voltage source on the side and the current source on the secondary side of the CT are connected in series with the normally open contact of the protection relay, and then connected in series with the trip coil of the circuit to connect the internal trip mechanism to open the circuit breaker. To improve the past The problem.

To achieve the above object, an improved device for a DC-controlled circuit breaker power-off and trip system: it is electrically connected to a power circuit, and the power circuit has at least one trip coil for disconnecting the circuit breaker of the power circuit for interlocking The tripping mechanism of the circuit breaker disconnects the circuit breaker; and the improved device of the DC control circuit breaker power-off and tripping system includes: a voltage detection device provided on at least one of the power circuit, the voltage detection device including A voltage reduction unit for reducing the output voltage; a current detection device provided on at least one of the power circuits, the current detection device including a current reduction unit for reducing the output current; and a power reduction unit provided on the power circuit A protection relay, the protection relay sets at least one of its protection electrical safety settings such as current, ground, voltage, frequency, temperature, etc. according to the state of the power system circuit, when the value of the detection device is greater than the electrical safety setting When the value is set, the normally open contact of the protection relay is activated; a trip circuit power circuit is at least electrically connected to the DC system power supply, the current detection device current reduction unit, the voltage detection device voltage reduction unit or an external support power supply; Automatic power supply alternating circuit, which is electrically connected to the trip circuit power supply circuit. The automatic power supply alternating circuit uses appropriate electrical energy output as the electrical energy of the trip coil driving the circuit breaker of the trip circuit; a capacitor energy storage circuit, the capacitor energy storage circuit Electrically connected trip circuit power supply circuit, suitable for storing DC energy; a protection setting circuit that is controlled according to the requirements and sequence of the power circuit system line, load status, and system protection coordination. The protection setting circuit operates the conduction contact and can be based on the demand. Connect with the remote intelligent forced power off command contact and continue; a sensing device connecting unit, the sensing device connecting unit includes at least two types of sensing devices: a current detection device and a voltage detection device; an external device device connection Unit, the external device connection unit at least contains 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; Contact status display unit, the contact status display unit can display the status of the system trip circuit; a DC control circuit breaker power off trip system improvement device can be based on DC power energy, voltage source power, current source power or external power ，Provide tripping drive power through the automatic power supply alternate circuit and then connect the normally open contact of the protection relay in series, or connect the normally open contact of the protection relay and then connect the remote intelligent forced power off command contact, and connect the circuit breaker in series The auxiliary contact is connected in series with the trip coil of the circuit breaker 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 closed in series is activated, the trip coil of the circuit breaker is subject to the trip loop power circuit The electrical energy or the electrical energy of the current lowering unit of the current detection device is activated to drive the trip mechanism of the circuit breaker to open the circuit breaker.

To achieve the above object, an improved device for a DC-controlled circuit breaker power-off and trip system: it is electrically connected to a power circuit, and the power circuit has at least one trip coil for disconnecting the circuit breaker of the power circuit for interlocking The tripping mechanism of the circuit breaker disconnects the circuit breaker; and the improved device of the DC control circuit breaker power-off and tripping system includes: a voltage detection device provided on at least one of the power circuit, the voltage detection device including A voltage reduction unit for reducing the output voltage; a current detection device provided on at least one of the power circuits, the current detection device including a current reduction unit for reducing the output current; and a power reduction unit provided on the power circuit A protection relay, the protection relay sets at least one of its protection electrical safety settings such as current, ground, voltage, frequency, temperature, etc. according to the state of the power system circuit, when the value of the detection device is greater than the electrical safety At the set value, the normally open contact of the protection relay is activated; a trip power supply circuit is at least electrically connected to the DC system power supply, current detection device current reduction unit, voltage detection device voltage reduction unit or external support power supply; An AC/DC conversion circuit, which is electrically connected to the voltage reduction unit of the voltage detection device, or externally connected to AC power to convert AC power into DC power, And the capacitor energy storage is used to electrically connect the DC energy to the capacitor energy storage; a power supply automatic alternating circuit, which is electrically connected to the trip circuit power circuit, and the power automatic switching circuit uses the appropriate energy output as the trip circuit to drive the circuit breaker The electrical energy of the trip coil; a capacitor energy storage circuit, which is electrically connected to the trip loop power supply circuit and stores appropriate DC energy; according to the needs and sequence control of the power loop system circuit, load status and system protection coordination Protection setting circuit, the protection setting circuit actuates the conduction contact and can be connected with the remote intelligent forced power-off command contact according to the demand; a sensing device connection unit, the sensing device connection unit at least includes a current detection device, More than two kinds of sensing devices for voltage detection devices; an external equipment device connection unit, the external equipment device connection unit includes at least a protection relay normally open contact, both ends of the trip coil of the circuit breaker or remote intelligent forced disconnection Electric command contact; a contact status display unit, the contact status display unit can display the status of the system trip circuit; a DC control circuit breaker power-off trip system improvement device can be based on DC power energy, voltage source energy, The current source power or external power is the power source, and the tripping drive power is provided through the automatic alternating circuit of the power supply, and then the protection relay normally open contact is connected in series, or the protection relay normally open contact is connected in parallel with the remote intelligent forced power off command connection. Point, and the circuit breaker is connected in series to close the auxiliary contact, 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 circuit breaker is closed and the auxiliary contact is activated, the trip coil of the circuit breaker is subject to the power or current of the trip circuit power circuit The electric energy of the current lowering unit of the detection device is activated to drive the trip mechanism of the circuit breaker to open the circuit breaker.

1: Improved device for DC control circuit breaker power-off trip system

10: Circuit breaker

11: Current detection device

12: Voltage detection device

13: Tripping mechanism

14: Circuit breaker closing auxiliary contact

15: Trip coil

16: Protection relay normally open contact

17: Remote intelligent forced power off command contact

18: Trip circuit power circuit

19: Protection relay

20: Power supply automatic alternating circuit

21: Sensing device connection unit

22: External device connection unit

23: contact status display unit

24: battery unit

28: control loop power supply

181: The first detection circuit

182: The first display unit

183: Simulated fault occurrence circuit

184: AC-DC conversion circuit

185: DC power alternating circuit

186: Second detection circuit

187: Second display unit

188,189: Switch B contact

190: Capacitor energy storage circuit

191: DC power supply parallel output circuit

192: Third detection circuit

193: Third display unit

Figure 1 Schematic diagram of the improved device wiring of the DC control circuit breaker power-off trip system

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

Figure 3 Schematic diagram of the trip circuit action of the improved device of the DC control circuit breaker power-off trip system

Figure 4 Schematic diagram of the improved device architecture of the DC control circuit breaker power-off trip system

The preferred embodiment of the improved device for the DC-controlled circuit breaker power-off and trip system of the present invention is shown in FIG. 1, where a circuit breaker 10 is provided on the power circuit, and the circuit breaker 10 has a trip coil 15. The tripping coil 15 links the tripping mechanism 13 of the circuit breaker 10; the power circuit is provided with a voltage detection device 12 (such as a voltage comparator). The voltage detection device 12 includes a voltage reduction unit for reducing the output voltage The step-down unit is electrically connected to the protection relay 19 and the control circuit power supply 28. The power circuit is also provided with a current detection device 11 (such as a current comparator). The current detection device 11 includes a current reduction unit for reducing the output current; the current reduction unit is electrically connected to the protection relay 19 and the control The loop power supply 28, the control loop power supply 28 selects the corresponding electrical energy to be connected in series to the protection relay 19 via the power automatic switching circuit 20 to connect the protection relay normally open contact 16. The protection relay 19 sets its protection electrical safety setting value according to the power system line, load status and protection coordination requirements. When the protection setting value is reached, the protection relay normally open contact 16 is activated and can be connected in parallel The intelligent forced power off command contact 17 is connected in series with the circuit breaker to close the auxiliary contact 14, and then the trip coil 15 of the circuit breaker 10 is connected in series to form a trip circuit system. In this way, the electrical energy of the current detection device 11 (such as a current transformer) and the electrical energy of the voltage detection device 12 (such as a voltage regulator) can be introduced to further improve the trip coil 15 of the circuit breaker 10 when an accident occurs There is enough power to drive to isolate the accident.

Please refer to FIG. 2 for further description of the principle of the present invention. As shown in the shaded box in FIG. 2, it is a schematic diagram of a general current detection device (current comparator). The current of the current-dropping unit of the current detection device 11 flows through an ammeter to form a complete loop. In order to further introduce the current of the current detection device 11 (such as a current transformer) as the power supply for the circuit breaker 10 to trip the coil 15, the present invention connects a side branch path of the current detection device 11 in parallel with the current lowering unit. This side branch path when the power system is normal, The protection relay 19 is not activated. The internal protection relay normally open contact 16 of the circuit breaker is open, and the circuit breaker closing auxiliary contact 14 of the circuit breaker 10 is in a conducting state. At this time, no current flows through the side branch path. However, when the power system fails, the protection relay 19 operates, the protection relay normally open contact 16 is turned on, and the circuit breaker closing auxiliary contact 14 is also turned on. The side branch path constitutes a complete loop conduction state, and the current detection device 11 ( For example, the current of the down-converting element passes through the side branch path, so it can be used as the power required for the circuit breaker 10 to trip the coil 15 and drive it.

Combining the technical characteristics of the side branch path of the current-reducing unit of the current detection device 11 (such as a current transformer) with the design of the conventional circuit breaker tripping power supply, please refer to FIG. 3. The shaded square in the upper left of Figure 3 indicates that the battery unit 24 is used as the tripping power supply for the tripping coil 15 of the circuit breaker 10 in the conventional DC system capacitor tripping device, which is usually sufficient to provide the tripping of the circuit breaker 10 in general. The driving power required by the coil 15. However, when the battery unit 24 is disabled due to human negligence, natural catastrophe, or expiration, it will not be able to drive the trip coil 15 to isolate the accident, which will cause great harm. If the technical characteristics of the current source of the current-reducing unit introduced into the current detection device 11 (such as a current transformer) are integrated, as can be seen from FIG. 3, when the system fails (the protection relay normally open contact 16 is conductive), if When the battery unit 24 of the conventional technique is disabled, the current of the power circuit continues to pass through the circuit breaker 10 at this time, so the current source of the current lowering unit of the current detection device 11 (such as a current transformer) still continues to have current flowing (see section 2 picture). At this time, the automatic power supply alternating circuit 20 is switched to the circuit of the current detection state 11 due to the disabling of the battery unit 24 of the conventional technique. The current flows into the trip coil 15 of the circuit breaker 10 as indicated by the dotted arrow to drive the trip The trip mechanism 13 is activated, so that the closed main contact of the circuit breaker 10 can be cut to isolate the accident point, which further improves the stability of the circuit breaker tripping circuit system to ensure the safety of the power system operation.

Based on the foregoing principles, a preferred embodiment of the improved device for the DC-controlled circuit breaker power-off and trip system of the present invention is a functional block diagram shown in FIG. 4. The system improvement device 1 has a DC input terminal connected to the battery unit 24 and an AC input terminal connected to the step-down unit of the voltage detection device 12. The battery unit 24 serves as a power source required for the operation of the circuit breaker trip circuit. 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. This converted DC power supply can be used The power required for the circuit, or the power output from the battery unit 24, is also connected to the DC power alternating circuit 185. The DC power alternating circuit 185 is preferably used when the step-down unit of the voltage detection device 12 has power The DC power output of the AC-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 the trip circuit. If the step-down unit of the voltage detection device 12 is disabled, the DC power alternating circuit 185 selects the power of the battery unit 24 to charge the capacitor energy storage circuit 190. The DC power alternating circuit 185 can usually be achieved using a 2A2B1C relay module or a switching module with the same function (not shown). The output power of the alternating current power supply circuit 185 (that is, the output power of the capacitor energy storage circuit 190) and the power source of the battery unit 24 are simultaneously input to the parallel output circuit 191 of the DC power supply. The power of 190 is used as a priority to provide the power needed to trip 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). In order to easily check the status of the trip circuit power supply circuit 18, the outputs of the battery unit 24, the capacitor energy storage circuit 190, and the DC power parallel output circuit 191 can be connected to the detection circuit and the display unit, such as a meter head and a seven-segment display, respectively Or other LCD panel (not shown). The detection circuit is provided with a voltage comparison circuit to judge whether the voltage is higher than a preset value to carry out necessary warning.

As shown in the schematic diagram of the current detection device shown in FIG. 2, the side branch path and the output of the parallel output circuit 191 of the DC power supply are connected to the power supply automatic switching circuit 20, and the power supply automatically switches The circuit 20 preferentially selects the power from the DC power parallel output circuit 191. When the power of the DC power parallel output circuit 191 is disabled, it switches to the side branch path of the current lowering unit of the current detection device 11, and the protection relay is normally open The contact 16 is turned on, the circuit breaker closing auxiliary contact 14 is also turned on, and the current of the current-reducing unit of the current detection 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. In the same way, the automatic power supply alternating 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 generating circuit 183 in FIG. 4 is used to conveniently test the working state of the trip loop power circuit 18. In addition, the remote intelligent forced power off command contact 17 can accept external commands from the remote end to perform remote control of the trip coil 15 of the circuit breaker 10. For example, the remote control can be through a serial communication module (such as RS485, RS422 Or RS232 or other communication ports), the serial communication module is preferably combined with the microcontroller interface to execute the transmission and reception of signals or control commands.

In summary, the improved device of the DC controlled circuit breaker power-off tripping system of the present invention further improves the stability of the circuit breaker tripping circuit system, has deep industrial applicability, and checks related products and approved ones on the market In the patent announcement, it is not seen that the technical characteristics of the invention are the same, and it also meets the novelty and progressive legal patent application requirements. Aid to file a patent application in accordance with the law, and urge your reviewer to grant the patent in this case as soon as possible to ensure the rights and interests of the applicant. However, the ones disclosed in this case are only the preferred embodiments of the present invention, which cannot be used to limit the scope of the rights of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are still covered by the patent application scope of the present invention in.

1: Improved device for DC control circuit breaker power-off trip system

10: Circuit breaker

11: Current detection device

12: Voltage detection device

13: Tripping mechanism

14: Circuit breaker closing auxiliary contact

15: Trip coil

16: Protection relay normally open contact

17: Remote intelligent forced power off command contact

18: Trip circuit power circuit

19: Protection relay

20: Power supply automatic alternating circuit

21: Sensing device connection unit

22: External device connection unit

23: contact status display unit

24: battery unit

181: The first detection circuit

182: The first display unit

183: Simulated fault occurrence circuit

184: AC-DC conversion circuit

185: DC power alternating circuit

186: Second detection circuit

187: Second display unit

188,189: Switch B contact

190: Capacitor energy storage circuit

191: DC power supply parallel output circuit

192: Third detection circuit

193: Third display unit

Claims (2)

An improved device for a DC-controlled circuit breaker power-off and trip system: it is electrically connected to a power circuit, and the power circuit has at least one trip coil for disconnecting the circuit breaker of the power circuit to link the trip of the circuit breaker The disconnection mechanism opens the circuit breaker; and the improved device of the DC control circuit breaker power-off tripping system includes: a voltage detection device provided on the power circuit at least one, the voltage detection device including a device for reducing the output voltage Step-down unit; a current detection device provided on the power circuit at least one, the current detection device includes a current reduction unit for reducing the output current; a at least one protection relay provided on the power circuit , The protection relay sets at least one of its protection electrical safety setting values such as current, grounding, voltage, frequency, temperature, etc. according to the state of the power system line. When the value of the detection device is greater than the electrical safety setting value, the protection power The normally open contact of the station is actuated and turned on; a trip power supply circuit is at least electrically connected to the DC system power supply, the current detection device current reduction unit, the voltage detection device voltage reduction unit or an external support power supply; Sexually connected trip circuit power supply circuit, the power automatic switching circuit uses appropriate electrical energy output as the electrical energy of the trip coil driving the trip circuit of the circuit breaker; a capacitor energy storage circuit, the capacitor energy storage circuit is electrically connected to the trip circuit Power supply circuit, suitable for storing DC energy; a sensing device connecting unit, the sensing device connecting unit includes at least two types of sensing devices, a current detecting device and a voltage detecting device; an external device device connecting unit, the The external device connection unit at least includes a protection circuit Station normally open contact, both ends of the trip coil of the circuit breaker or external forced command conduction contact; a contact status display unit, the contact status display unit can display the status of the system trip circuit; a DC control circuit breaker The improved device of the power-off and tripping system can provide tripping drive power through the automatic alternating circuit of the power supply according to the power supply of the DC power source, the voltage source power, the current source power or the external power source, and then connect the protection relay normally open contact or protect the relay normally Open the contact and then connect the remote intelligent forced power off command contact, and then connect the trip coil of the circuit breaker in series to form a trip circuit system, the protection relay normally open contact or the remote intelligent forced power off When the command contact is turned on, when the circuit breaker is closed and the auxiliary contact is activated, the trip coil of the circuit breaker is actuated by the power of the trip circuit power circuit or the power of the current detection device to drive the trip mechanism of the circuit breaker To open the circuit breaker. An improved device for a DC-controlled circuit breaker power-off and trip system: it is electrically connected to a power circuit, and the power circuit has at least one trip coil for disconnecting the circuit breaker of the power circuit to link the trip of the circuit breaker The disconnection mechanism opens the circuit breaker; and the improved device of the DC control circuit breaker power-off tripping system includes: a voltage detection device provided on the power circuit at least one, the voltage detection device including a device for reducing the output voltage Step-down unit; a current detection device provided on the power circuit at least one, the current detection device includes a current reduction unit for reducing the output current; a at least one protection relay provided on the power circuit , The protection relay sets at least one of its protection electrical safety setting values such as current, grounding, voltage, frequency, temperature, etc. according to the state of the power system line. When the value of the detection device is greater than the electrical safety setting value, the protection power Yichangkai Contact actuation conduction; a trip circuit power supply circuit, at least electrically connected to the DC system power supply, current detection device current reduction unit, voltage detection device voltage reduction unit or external support power supply; an AC-DC conversion circuit, the AC-DC conversion The circuit is electrically connected to the step-down unit of the voltage detection device, or an external AC power, converts the AC power into DC power, and electrically connects the DC power to the capacitor storage with capacitor energy storage; a power supply automatically alternates the circuit, electricity Sexually connected trip circuit power supply circuit, the power automatic switching circuit uses appropriate electrical energy output as the electrical energy of the trip coil driving the trip circuit of the circuit breaker; a capacitor energy storage circuit, the capacitor energy storage circuit is electrically connected to the trip circuit Power supply circuit, suitable for storing DC energy; a sensing device connecting unit, the sensing device connecting unit includes at least two types of sensing devices, a current detecting device and a voltage detecting device; an external device device connecting unit, the The connection unit of the external equipment includes at least one protection relay normally open contact, both ends of the trip coil of the circuit breaker or the remote intelligent forced power off command contact; a contact status display unit, which can display the contact status display unit The state of the system's trip circuit; an improved device for a DC-controlled circuit breaker power-off and trip system that can provide trip drive via a power supply automatic alternating circuit based on DC power energy, voltage source power, current source power, or external power capacitors as the power source The electrical energy is then connected in series to protect the normally open contact of the relay, or to protect the normally open contact of the relay, and then connect the remote intelligent forced power off command contact, and then connect the trip coil of the circuit breaker in series to form a trip circuit System, when the protection relay normally open contact or remote intelligent forced power off command contact is turned on, when the circuit breaker is closed and the auxiliary contact is activated, the circuit breaker trips the coil to control the return The electrical energy of the circuit power supply or current detection device is activated to drive the trip mechanism of the circuit breaker to open the circuit breaker.

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