CN111969565B - Improved device of high-voltage power-off tripping system of DC control circuit breaker - Google Patents
Improved device of high-voltage power-off tripping system of DC control circuit breaker Download PDFInfo
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- CN111969565B CN111969565B CN201910418751.8A CN201910418751A CN111969565B CN 111969565 B CN111969565 B CN 111969565B CN 201910418751 A CN201910418751 A CN 201910418751A CN 111969565 B CN111969565 B CN 111969565B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/06—Arrangements for supplying operative power
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
Technical Field
The invention relates to an improved device of a high-voltage power-off tripping system of a direct-current control circuit breaker, in particular to an improved device for improving the problem that accidents cannot be isolated when a direct-current power supply system has problems and the accidents occur in a conventional high-voltage large power distribution (transformation) station which is generally used as a main control loop powered by a battery pack.
Background
In a high-voltage large-scale power receiving (distribution) station, under the condition of abundant expenditure and space permission, a battery assembled by a large-scale battery pack is used as a power supply device for a control power supply of the power receiving (distribution) system under the condition of high power supply system stability. Generally, a power supply system composed of a battery pack is a relatively appropriate power supply method. For example, taiwan Power Company (TPC) is mainly using dc supply for high voltage (above 36 KV) power supply and receiving (distribution) stations, and the control power supply mode for the circuit breaker is generally using storage battery to supply power, so as to protect the stability of the receiving (distribution) power supply system.
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 breaker cannot be tripped immediately when a short circuit accident occurs in a certain business unit (power receiver), the high-voltage breaker (h.v.cb) will be damaged, and the power supply of the main power supply main line to other business units (power receivers) will be affected, resulting in chain 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 even 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, so that carelessness is not realized. Because accidents are often caused by misjudgment of the high-risk industrial safety event, operators (such as taiwan power company) of a power supply main line cannot trigger the circuit breaker to trip due to the voltage sudden motion of 64009when the relay is prevented from short-circuit accidents, and require a protection system to be set by a public institution according to regulations so as to answer the power supply due to the saturation delay motion of the voltage sudden motion of 63946. The main prescriptions are: when the secondary side power supply of the transformer is adopted, a Capacitor Tripping Device (CTD) or a capacitor tripping device is assisted and then is connected with a UPS (uninterrupted power supply), and the Capacitor Tripping Device (CTD) used by an electronic or digital relay can not be used by a circuit breaker or other equipment. This is ideal, but an accident often results from the ideal situation where a real Uninterruptible Power System (UPS) will fail due to battery aging almost a year or two years later. 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 it, and usually, when there is a short-circuit accident, it is found that the high-voltage circuit breaker (h.v.cb) cannot trip, and it is found that the dc working power supply without a trip circuit cannot supply the working power to the protection Relay (Relay), but it is late.
In view of the above-mentioned factors, when the dc power supply of the storage battery pack is disabled, if an accident occurs in the system (no matter what accident happens) during this period, for example, CO, LCO, UV, OV, etc., the breaker isolating the accident point may cause a high voltage panel (also called power distribution cabinet) without working power supply when the working power supply (dc power supply of the storage battery pack) supplied to the trip circuit is disabled, and thus the accident point cannot be isolated.
In the existing system using the dc storage battery pack as a control power supply, a single dc storage battery pack may be used to provide the dc power supply or two groups of dc storage battery packs may be used to provide the dc power supply in a mutually supporting manner, so as to supply the dc power supply to the overall power distribution system. In a practical 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, DC power is preferred (only one of AC and DC is selected), because DC power is generally stable and reliable, so DC power systems based on battery packs are the most preferred option for customers, both in the field and under economic conditions.
In the actual state, the characteristics of the storage battery equipment are the characteristics, the storage battery equipment can lose aging and have failure in one year to two years, and some unpredictable conditions can occur even among the whole control circuits, so that when the working power supply of the trip loop fails, the system is just like using an Alternating Current (AC) power supply as the working power supply of the trip control loop; to prevent accidents caused by the failure of protection relay due to sudden voltage drop when the DC power supply is disabled. In order to prevent the above-mentioned situations, a control circuit capable of providing dc power is developed to avoid possible accidents during the power failure, and an improved device of the high-voltage power failure trip system of the dc control circuit breaker is one of the methods for solving the above-mentioned problems.
The applicant of the present invention has already proposed and patented several proposals for improving the working power supply of the trip circuit in the high-voltage distribution board of the high-voltage distribution system. In particular, in the aspect of improvement of the capacitor trip device CTD, from the aspect of testing under load, the capacitor trip device having an electricity meter displaying its voltage value to the panel type, which can effectively prevent the work safety accident prevention which may be caused by opening a high voltage distribution board, 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 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 occurrence of an accident, further, there is a CTD of an automatic power conversion circuit to prevent an external power from being supported by ac and dc power when the capacitor trip device fails, and it is possible to solve the problems of voltage, capacitance and communication, and a dc control circuit breaker trips using a dc capacitor trip device, which are products in the current market.
In summary, the control circuit mainly using the dc power supply or the ac power supply cannot effectively solve the actual situation faced in the field when the trip circuit of the high-voltage disk loses the working power, so that the dc control circuit breaker high-voltage power failure trip system improving apparatus can solve the above-mentioned problem according to the actual demand of the situation in the field, and simultaneously improve the safety and stability of the power distribution system.
Disclosure of Invention
Purpose(s) to
The invention provides an improved device of a high-voltage power-off tripping system of a direct-current control circuit breaker, which can effectively solve the accident in the market that a direct-current power supply is mainly used as a tripping loop working power supply. The invention relates to a high-voltage power-off tripping system improvement device of a direct-current control circuit breaker, which is mainly based on a battery pack as an energy storage mode and only has single protection, so that under the condition of a control loop mainly based on direct-current power supply, the structure of an original distribution board is not changed under the condition of not changing the protection coordination set by a protection relay of the original system, and under the condition of a high-voltage circuit breaker which is tested in a set mode, a voltage source on the secondary side of a transformer PT and a current source on the secondary side of a transformer CT in the original electric power system are connected in series to protect a normally open contact of the relay, and then a tripping coil of the circuit breaker is connected in series to link an internal tripping mechanism to break the circuit breaker, thereby improving the prior problem.
Means for solving the problems
To achieve the above objective, the present invention provides an improved device of a high-voltage power-off tripping system of a dc control circuit breaker, 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. The improved device of the high-voltage power-off tripping system of the direct-current control circuit breaker preferably comprises: a voltage detection device is selectively arranged on the power loop, and the voltage detection device comprises a voltage reduction unit for reducing the output voltage. The invention mainly comprises a current detection device arranged on the power loop, wherein the current detection device comprises a current reduction unit for reducing output current; and the protective relay is arranged on the electric power loop, at least one protective electric safety set value such as current, grounding, voltage, frequency, temperature and other numerical values is set according to the state of a circuit of an electric power system, and when the numerical value of the current detection device is greater than the electric safety set value, the normally-open contact of the protective relay is actuated and conducted. The above invention further comprises: a trip loop power circuit, which is electrically connected with at least the DC system power supply, the current reduction unit of the current detection device or the external support power supply, and can also be connected with the voltage reduction unit of the voltage detection device if necessary. The circuit is selectively provided with a power supply automatic alternating circuit, the power supply automatic alternating circuit is electrically connected with the trip loop power supply circuit, and the power supply automatic alternating circuit takes proper electric energy output as the electric energy of the trip loop driving the trip coil of the breaker. And a capacitor energy storage circuit electrically connected to the trip loop power circuit for storing appropriate DC power. The invention sets the circuit according to the line of the power loop system, the load state, the requirement of system protection coordination and the protection of sequential control. The protection setting circuit actuates and conducts the contact and can be connected in parallel with the remote intelligent forced power-off command contact according to the requirement. The present invention is further provided with a sensing device connection unit, which preferably comprises a current detection device, although a voltage detection device may be selected as a sensing device if necessary. The invention is provided with an external equipment device connecting unit, wherein 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 a remote intelligent forced power-off instruction contact; a contact state display unit, which can display the state of the system tripping loop; the improved device of the high-voltage power-off tripping system of the direct-current control circuit breaker can provide tripping driving electric energy through a power supply automatic alternating circuit according to direct-current power supply electric energy, voltage source electric energy, current source electric energy or external electric energy, and then is connected in series with a protective relay normally-open contact, or the protective relay normally-open contact is connected in parallel with a remote intelligent forced power-off instruction contact, is connected in series with a closing auxiliary contact of the circuit breaker, and then is connected in series with a tripping coil of the circuit breaker to form a tripping loop system. When the protective relay normally open contact or the remote intelligent forced power-off instruction contact is conducted and the serially connected breaker closing auxiliary contact is actuated and conducted, the trip coil of the breaker is actuated by the electric energy of the trip loop power circuit or the electric energy of the current reduction unit of the current detection device so as to drive the trip mechanism of the breaker to break the breaker.
To achieve the above object, the present invention further provides an improved device of a high voltage trip system of a dc control circuit breaker, which is electrically connected to a power circuit. The power circuit is provided with a trip coil for disconnecting the breaker of the power circuit so as to link a trip mechanism of the breaker to disconnect the breaker. The improved device of the high-voltage power-off tripping system of the direct-current control circuit breaker comprises: and the voltage detection device is arranged on the power loop and can be selectively arranged if necessary, and the voltage detection device comprises a voltage reduction unit for reducing the output voltage. The improved device of the high-voltage power-off tripping system of the direct-current control circuit breaker further comprises a current detection device arranged on the power circuit, wherein the current detection device comprises a current reduction unit for reducing output current; a protective relay arranged on the power loop, wherein the protective relay sets at least one protective electrical safety set value such as current, grounding, voltage, frequency, temperature and the like according to the state of a power system line, and when the numerical value of the current detection device is greater than the electrical safety set value, a normally open contact of the protective relay is actuated and conducted; a trip loop power circuit is electrically connected with the direct current system power supply, the current reduction unit of the current detection device, the voltage reduction unit of the voltage detection device or an external support power supply; 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 so as to convert the alternating current electric energy into direct current electric energy, and the capacitor energy storage is used for electrically connecting the direct current electric energy to the capacitor energy storage; the power supply automatic alternating circuit is electrically connected with the trip loop power supply circuit, and the power supply automatic alternating circuit outputs proper electric energy as the electric energy of a trip coil of the trip loop driving circuit breaker; and a capacitor energy storage circuit electrically connected to the trip circuit power circuit for storing appropriate DC power. The circuit is set according to the requirements of the system circuit, the load state and the system protection coordination and the protection of sequential control of the power loop system, and the actuation conducting contact of the protection setting circuit can be connected in parallel with the remote intelligent forced power-off command contact according to the requirements. The improved device of the high-voltage power-off tripping system of the direct-current control circuit breaker further comprises: a sensing device connection unit, which at least comprises more than two sensing devices of a current detection device and a voltage detection device; an external equipment device connection unit at least comprises a protective relay normally open contact, two ends of a tripping coil of a breaker or a remote intelligent forced power-off instruction contact; and a contact state display unit for displaying the state of the system trip loop. The improved device of the high-voltage power-off tripping system of the direct-current control circuit breaker can provide tripping driving electric energy through a power supply automatic alternating circuit and then serially connect a protective relay normally-open contact or a protective relay normally-open contact and then parallelly connect a remote intelligent forced power-off instruction contact, serially connect a closing auxiliary contact of the circuit breaker and then serially connect a tripping coil of the circuit breaker to form a tripping loop system by taking direct-current power supply electric energy, voltage source electric energy, current source electric energy or external electric energy as an electric power source. When the protective relay normally open contact or the remote intelligent forced power-off command contact is conducted and the breaker is closed and the auxiliary contact is actuated and conducted, the trip coil of the breaker is actuated by the electric energy of the trip loop power circuit or the electric energy of the current reduction unit of the current detection device so as to drive the trip mechanism of the breaker to break the breaker.
Drawings
Fig. 1 is a schematic wiring diagram of an improved device of a high-voltage power-off tripping system of a direct-current control circuit breaker according to the invention.
Fig. 2 is a schematic diagram of a current detection device (current transformer).
Fig. 3 is a schematic diagram of the trip loop operation of the improved apparatus for high-voltage power failure trip system of the dc control circuit breaker according to the present invention.
Fig. 4 is a schematic structural diagram of an improved apparatus of a high-voltage power-off tripping system of a dc control circuit breaker according to the present invention.
Symbolic illustration in the drawings:
1. the high-voltage power-off tripping system of the direct-current control circuit breaker is improved; 10. a circuit breaker; 11. a current detecting device; 12. a voltage detection device; 13. a tripping mechanism; 14. the circuit breaker closes the auxiliary contact; 15. tripping the coil; 16. protecting the normally open contact of the relay; 17. a remote intelligent forced power-off instruction contact; 18. a trip loop power circuit; 19. protecting the relay; 20. a power supply automatic alternation circuit; 21. a sensing device connecting unit; 22. an external device connection unit; 23. a contact state display unit; 24. a battery cell; 28. a control loop power supply; 181. a first detection circuit; 182. a first display unit; 183. a simulated fault generating circuit; 184. an AC-DC conversion circuit; 185. a DC power supply alternation circuit; 186. a second detection circuit; 187. a second display unit; 188. 189 switch B contact; 190. a capacitive storage circuit; 191. the direct current power supply is connected with the output circuit in parallel; 192. a third detection circuit; 193. and a third display unit.
Detailed Description
The invention discloses an improved device of a high-voltage power-off tripping system of a direct-current control circuit breaker, which is implemented in a preferred embodiment as shown in fig. 1, wherein a circuit breaker 10 is arranged on a power circuit, the circuit breaker 10 is provided with a tripping coil 15, and the tripping coil 15 is linked with a tripping mechanism 13 of the 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 loop, and the current detection device 11 comprises a current reduction unit for reducing the output current; the current-reducing 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 electric energy through the power automatic alternating circuit 20 and is connected in series to the protection relay 19 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 can introduce 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 power consumption of the trip coil 15 of the circuit breaker 10 to ensure sufficient power to drive and isolate the accident.
The principle of the present invention is further explained with reference to fig. 2. As shown in the block diagram of fig. 2, a current detection device (current transformer) is a general current detection device, and a current of a 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 detection device 11 (such as a current transformer) as the power source of the trip coil 15 of the circuit breaker 10, the current dropping unit of the current detection device 11 is connected in parallel with a side branch path. 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, the current of the current reducing unit of the current detecting device 11 (such as current transformer) passes through the side branch path, and thus, the power required for driving the trip coil 15 of the breaker 10 can be used.
The technical features of the current detecting device 11 (such as a current transformer) for the side branch path of the current reduction unit are combined with the design of the trip power source of the existing circuit breaker, as shown in fig. 3. The upper left block of fig. 3 shows that a battery unit 24 of a dc system capacitive trip device has been used as a trip power source for trip coil 15 of circuit breaker 10, which is typically sufficient to provide the driving power required for trip coil 15 of circuit breaker 10. However, when the battery unit 24 is disabled due to human negligence, disastrous accident or overdue, the trip coil 15 cannot be driven to isolate the accident, and thus a great hazard is generated. As can be seen from fig. 3, when a system fault (the protection relay normally open contact 16 is turned on) occurs, if the battery unit 24 of the prior art fails, the current of 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 a current transformer) still continues to flow (see fig. 2). At this time, the power supply automatic alternation circuit 20 is switched to the loop of the current detection device 11 due to the incapability of the battery unit 24 in the prior art, and the current flows into the trip coil 15 of the circuit breaker 10 as shown by a 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 an accident point, and the stability of the circuit breaker trip loop system is further improved to ensure the safety of the operation of the power system.
In accordance with the foregoing principles, a functional block diagram of a preferred embodiment of the improved apparatus for high voltage power failure trip system of dc control circuit breaker according to the present invention is shown in fig. 4, wherein the improved apparatus 1 for high voltage power failure trip system of dc control circuit breaker has a dc input terminal connected to the battery unit 24 and an ac input terminal connected to the voltage reduction 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 voltage reduction unit of the voltage detection device 12 is connected to the ac input end 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 can be used as a power required by the circuit or as a power output from the battery unit 24, and is connected to a dc power supply alternating circuit 185, and the dc power supply alternating 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 charged, so as to charge the capacitor energy storage circuit 190, and store the electric energy required by the trip circuit by using a capacitor. If the voltage-reducing unit of the voltage detection device 12 is disabled, the dc power supply alternation circuit 185 selects the power supply of the battery unit 24 to charge the capacitive energy storage circuit 190. The dc power source 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 power of the battery 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 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 status of the trip circuit power circuit 18, the outputs of the battery 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 schematic diagram of the current detection apparatus 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 apparatus 11 is switched, at this time, 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 reduction unit of the current detection apparatus 11 flows through the side branch path, so as to drive the trip coil 15 to actuate the trip mechanism 13, thereby isolating the accident point. Similarly, the power auto-alternating circuit 20 can be implemented by 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 remote intelligent forced power-off command contact 17 can receive an external command from a remote location to remotely control the trip coil 15 of the circuit breaker 10, for example, through a serial communication module (e.g., a communication port such as RS485, RS422, or RS 232) that preferably performs transmission and reception of signals or control commands in conjunction with a microcontroller interface.
In summary, the improved device for high-voltage power-off tripping system of dc control circuit breaker of the present invention introduces 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 operate to open the circuit breaker, so that the safety of breaking, tripping and isolating accidents can be ensured under the condition that the power supply of the tripping loop is disabled, and the power supply quality can be enhanced. The invention further improves the stability of the circuit breaker tripping loop system and has industrial utilization.
The disclosure of the present invention is only a preferred embodiment, and should not be taken as limiting the scope of the invention, but rather as encompassing all equivalent variations and modifications within the spirit and scope of the invention as claimed.
Claims (3)
1. An improved device of a high-voltage power-off tripping system of a direct-current control circuit breaker is electrically connected with a power circuit, and the power circuit is provided with at least one tripping coil for disconnecting the circuit breaker of the power circuit so as to link a tripping mechanism of the circuit breaker to disconnect the circuit breaker; the high-voltage power-off tripping system improvement device of the direct-current control circuit breaker is characterized by comprising:
a current detection device arranged on the power loop, wherein the current detection device comprises a current reduction unit for reducing output current;
a protection relay arranged on the power loop, setting a protection electrical safety set value according to a power system line, a load state and a protection coordination requirement and at least one of current, grounding, voltage, frequency and temperature, and when the value of the current detection device is greater than the electrical safety set value, the normally open contact of the protection relay is actuated and conducted;
a trip loop power circuit, the trip loop power circuit is at least electrically connected with a DC system power supply, a current reduction unit of the current detection device or an external support power supply;
the power supply automatic alternating circuit is electrically connected with the trip loop power supply circuit and outputs proper electric energy as the electric energy of a trip coil of the trip loop driving circuit breaker;
a capacitor energy storage circuit electrically connected to the trip loop power circuit for storing appropriate DC power;
a sensing device connection unit, which at least comprises a sensing device of the current 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 conduction contact;
a contact state display unit, which displays the state of the system tripping loop;
the improved device of the high-voltage power-off tripping system of the direct-current control circuit breaker is characterized in that according to direct-current power supply electric energy, current source electric energy or external electric energy, tripping driving electric energy is provided by the power supply automatic alternating circuit and then is connected with the protective relay normally open contact in series, or the protective relay normally open contact is connected with the remote intelligent forced power-off instruction contact in parallel, and is connected with the circuit breaker closing auxiliary contact in series, and then the tripping coil of the circuit breaker is connected in series to form a tripping loop system, the protective relay normally open contact or the remote intelligent forced power-off instruction contact is conducted, and when the circuit breaker closing auxiliary contact is conducted in an actuating mode, the tripping coil of the circuit breaker is actuated by the electric energy of the tripping loop power supply circuit or the electric energy of the current detection device, so that the tripping mechanism of the circuit breaker is driven to break the circuit breaker.
2. An improved device of a high-voltage power-off tripping system of a direct-current control circuit breaker is electrically connected with a power circuit, and the power circuit is provided with at least one tripping coil for disconnecting the circuit breaker of the power circuit so as to link a tripping mechanism of the circuit breaker to disconnect the circuit breaker; the high-voltage power-off tripping system improvement device of the direct-current control circuit breaker is characterized by comprising:
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 arranged on the power loop, wherein the current detection device comprises a current reduction unit for reducing output current;
a protective relay arranged on the power circuit, setting a protective electrical safety set value of the protective relay according to the state of a power system line, and when the numerical value of the current detection device is greater than the electrical safety set value, enabling a normally open contact of the protective relay to be in active conduction;
a trip loop power circuit, which is electrically connected with at least one DC system power supply, the current reduction unit of the current detection device, the voltage reduction unit of the voltage detection device or an external support power supply;
the alternating current-direct current conversion circuit is electrically connected to the voltage reduction unit of the voltage detection device so as to convert alternating current electric energy into direct current electric energy, and the direct current electric energy is stored by a capacitor energy storage circuit;
the power supply automatic alternating circuit is electrically connected with the trip loop power supply circuit and outputs proper electric energy as the electric energy of a trip coil of the trip loop driving circuit breaker;
the capacitor energy storage circuit is electrically connected with the trip loop power circuit to store proper direct current electric energy;
a sensing device connecting unit, which at least comprises the sensing device of the current 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 the breaker or a remote intelligent forced power-off command contact;
a contact state display unit, which displays the state of the system tripping loop;
the improved device of the high-voltage power-off tripping system of the direct-current control circuit breaker takes direct-current power supply electric energy, voltage source electric energy, current source electric energy or an external electric energy capacitor as an electric power source, trip driving electric energy is provided by the power supply automatic alternating circuit and then is connected in series with the protective relay normally open contact, or the protective relay normally open contact is connected in parallel with the remote intelligent forced power-off command contact, and is connected in series with a circuit breaker closing auxiliary contact, and then is connected in series with a tripping coil of the circuit breaker to form a tripping loop system.
3. The improved apparatus of claim 2, wherein the protection relay is based on the power system line, load status and protection coordination requirement, and the protection electrical safety setting of the protection relay is set according to at least one of current, ground, voltage, frequency and temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910418751.8A CN111969565B (en) | 2019-05-20 | 2019-05-20 | Improved device of high-voltage power-off tripping system of DC control circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910418751.8A CN111969565B (en) | 2019-05-20 | 2019-05-20 | Improved device of high-voltage power-off tripping system of DC control circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111969565A CN111969565A (en) | 2020-11-20 |
| CN111969565B true CN111969565B (en) | 2023-01-10 |
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| CN111969565A (en) | 2020-11-20 |
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