CN110780127A - Portable automatic phase sequence detection device - Google Patents

Abstract

The invention discloses a portable automatic phase sequence detection device, which relates to the technical field of power devices. The automatic phase sequence detection system in the phase sequence detection device includes a phase sequence detection switch, a first power supply control relay, a second power supply control relay, a third power supply control relay, a fourth power supply control relay, a first relay, and the same phase sequence indication Lights and different phase sequence indicators. The device firstly uses the power control relay to detect the phase sequence category of the three-phase power supply of different lines or different groups of transformers, and then compares the above phase sequence categories through the reverse phase connection of the power control relay, and can reliably detect any low-voltage power supply. Whether the phase sequence is the same; it not only solves the problems of limited application range and low reliability of automatic phase verification devices in the prior art, but also solves the problems of low safety and cumbersome operation of manual detection of phase sequence, making it safe and fast for emergency equipment. Earth power supply is guaranteed.

Description

A portable automatic phase sequence detection device

technical field

The invention relates to an electric power device, in particular to a portable automatic phase sequence detection device.

Background technique

With the development of the economy, people have higher and higher requirements for the reliability of electricity use. In order to ensure that users do not have power outages, emergency power protection, power transmission, temporary power supply, and power supply conditions are becoming more and more common. It has become the norm to ensure users' electricity demand by using emergency equipment to supply or take electricity. Common emergency equipment includes generator vehicles, UPS power supply vehicles, mobile box-to-transformation vehicles, and low-voltage cable vehicles.

At present, emergency equipment generally uses its own cable to directly connect to the low-voltage power grid interface for power supply. Since the phase sequence detection is not performed before power supply, the phase sequence of the output power supply is often inconsistent with the phase sequence of the user's power grid power supply, resulting in the user's three-phase equipment (such as Elevators, lathes, etc.) cannot be used or work in reverse, which may even cause accidents and endanger personal safety.

In order to avoid the inconsistency of the phase sequence when the emergency equipment is powered, the phase sequence must be checked before power supply. There are two ways to check the phase sequence: one is to use the phase sequence table for manual detection, and the other is to configure an automatic phase-checking device for emergency equipment.

The first method: using a phase sequence table, the advantage is that the investment is less and the applicability is strong, but this method requires the operator to hold the phase sequence table and contact the 400V power supply, and the operator's personal safety cannot be obtained. In addition, the operation steps are cumbersome and the reliability is not high. Once the manual judgment is wrong, the consequences will be serious.

The second way: Generally, an automatic phase verification device is installed inside the vehicle, and the automatic phase verification is generally realized by carrying a simple generalized bridge or directly installing a phase detector. For example, Chinese patent CN204330898U discloses a low-voltage nuclear phase system for a bypass mobile box transformer emergency repair vehicle. In its technical description, the principle of current balance is used to carry a generalized electric bridge to realize a low-voltage nuclear phase system. The system can adjust the adjustable resistance on the spot. Observing the current value to judge the phase situation can be used to detect whether the three-phase power supply phase of the same group of transformers in the same line is the same, but it cannot detect whether the three-phase power supply phase sequence of different lines or different groups of transformers is consistent, and the use limitations are relatively limited. It is not suitable for the phase sequence detection of emergency equipment and low-voltage power grid. Moreover, the operation is complicated, and the reliability of the result is not high. In addition, Chinese patent CN201937193U disclosed in the mobile box-transformer with automatic phase checking system, the mobile box-transformer is to directly connect the low-voltage power supply and the power supply of the distribution transformer to the phase meter, and the phase meter judges the phase, It realizes the automatic phase checking and automatic switching of the mobile box changing vehicle, and avoids the manual phase checking operation and switching operation on site. However, since the phase meter can only detect the phase angle, that is to say, the phase checking method can only be used to judge whether the three-phase power supply phases of the same group of transformers in the same line are the same. The phase sequence of the phase power supply cannot be judged, and it is also not applicable to the phase sequence detection of emergency equipment and low-voltage power grids.

In addition, there are many interface forms for low-voltage power grids, such as low-voltage switchgear busbars, overhead lines, and various types of quick connectors. However, emergency equipment is generally only equipped with a cable with one interface type, which can only meet the interface requirements of a few low-voltage power grids. As a result, it often occurs that emergency equipment cannot be connected. In view of this situation, the existing solution is to carry out on-site modification of the emergency equipment's own cable, which is not only time-consuming and labor-intensive, but also causes damage and waste to the self-contained cable. If multiple cable interfaces are configured, a large number of cables need to be configured, resulting in repeated purchase of cables and a waste of a lot of economic resources. The above problems seriously restrict the development of emergency equipment, and at the same time, have a huge impact on the improvement of electricity reliability.

Therefore, there is currently no known technology to solve the problems of automatic phase sequence detection of emergency equipment and rapid access to low-voltage distribution networks.

SUMMARY OF THE INVENTION

In view of the above problems, the present invention discloses a portable automatic phase sequence detection device. The device firstly uses a power supply control relay to detect the phase sequence types of three-phase power supplies of different lines or different groups of transformers, and then uses the power supply control relay to reverse the phase connection mode. By comparing the above phase sequence categories, it can be reliably detected whether the phase sequence of any low-voltage power supply is the same. It not only solves the problems of limited use range and low reliability of the automatic phase checking device in the prior art, but also solves the problems of low safety and complicated operation of manual phase sequence detection, and provides a guarantee for the safe and rapid power supply of emergency equipment.

According to the purpose of the present invention, a portable automatic phase sequence detection device is proposed, which includes a box body, a circuit breaker, a cable interface, an opening and closing switch, and an automatic phase sequence detection system. The automatic phase sequence detection system includes a phase sequence detection switch, a first relay, an indicator light with the same phase sequence, an indicator light with a different phase sequence, and two groups of power supply control relays; each group of two power supply control relays is respectively connected to the input end and the output end of the circuit breaker, and the two groups of power supply control relays are connected to the circuit breaker. The input terminal and the output terminal are connected in reverse phase sequence; one group of normally open contacts of the same group of two power supply control relays are connected in series, the two groups of power supply control relays are connected in series and then connected in parallel, and the coils of the first relay are respectively connected with the two groups of power supply in series. The other end of the normally open contact of the control relay is connected; the first relay includes two groups of normally open contacts and one group of normally closed contacts, one group of normally open contacts is connected with the indicator light in the same phase sequence, and the other group is connected with The opening and closing switches are connected in series, and a group of normally closed contacts is connected with the indicator lights of different phase sequences.

Preferably, the two groups and four power supply control relays are respectively the first power supply control relay, the second power supply control relay, the third power supply control relay and the fourth power supply control relay; Phase C is connected to phase A, phase B, and phase C of the input terminals of the circuit breaker. The A-phase, B-phase and C-phase of the power supply of the control relay are connected with the A-phase, B-phase and C-phase of the circuit breaker output terminal; B-phase and A-phase are connected.

Preferably, the circuit breaker includes a circuit breaker body, a circuit breaker closing mechanism, and a circuit breaker opening mechanism, and the opening and closing switches are respectively connected with the circuit breaker closing mechanism and the circuit breaker opening mechanism. The cable interface is installed on both sides of the box, including an input cable interface and an output cable interface. The input cable interface includes an input N-phase interface and an input A, which is respectively connected to the A-phase, B-phase, and C-phase terminals of the input end of the circuit breaker. Phase interface, input B-phase interface, and input C-phase interface; the output cable interface includes an output N-phase interface, and an output A-phase interface and an output B-phase interface respectively connected to the A-phase, B-phase, and C-phase terminals of the circuit breaker output terminal. and an output C-phase interface, the input N-phase interface is connected with the output N-phase interface.

Preferably, the input cable interface is a quick connector or a copper bar, and the output cable interface is a quick connector; the cable interface and the circuit breaker are connected by a cable or a copper bar.

Preferably, an adapter cable is connected to the output cable interface, one end of the adapter cable is a quick connector connected to the output cable interface, and the other end is configured with a variety of interface forms that can be matched with various interfaces of the low-voltage distribution network. .

Preferably, the interface configured at one end of the transfer cable connected to the low-voltage power distribution network is in the form of a copper terminal, a quick connector, or a drain clip.

Preferably, the device further includes a voltage and current display device, and the voltage and current display device includes a current signal detection device installed on the cable or copper bar connected between the cable interface and the circuit breaker, and a current signal detection device for displaying voltage, current, power, frequency power meter.

Preferably, the device further includes a quasi-synchronous controller for comparing voltage amplitudes and phase angles.

Preferably, the device further comprises a power test port, the power test port includes an input power test port and an output power test port, the input power test port is connected to the input end of the circuit breaker, and the output power test port is connected to the circuit breaker output end connected, the electricity inspection port is provided with insulation protection and an anti-shock structure.

Preferably, the box body includes a box body, a handle, a door lock with a fingerprint recognition function, and a universal wheel, and the box body is a double door structure.

Compared with the prior art, the advantages of the portable automatic phase sequence detection device disclosed in the present invention are:

(1) The present invention firstly uses the power control relay to detect the phase sequence categories of the three-phase power supply of different lines or different groups of transformers, and then compares the above phase sequence categories through the reverse phase connection mode of the power control relay, which can reliably detect Whether the phase sequence of any low-voltage power supply is the same. It not only solves the problem that the automatic phase checking device in the prior art can only detect whether the three-phase power supply phases of the same group of transformers in the same line are the same and reliable, but also solves the problems of low safety and complicated operation of manual detection of phase sequence. , which provides a guarantee for the safe and rapid power supply of emergency equipment.

(2) The invention is provided with a cable interface and a transfer cable, and the emergency equipment can be easily and quickly connected to the low-voltage power grid by using its own cable, which solves the problems of on-site modification of the emergency equipment cable and repeated cable purchase, saving a lot of manpower, material resources.

(3) The three-phase power controller in the automatic phase sequence detection system of the present invention has the functions of phase loss protection and undervoltage protection. Only when the two power sources of the input end and the output end are completely normal and the phase sequence is consistent, the phase sequence consistent signal can be output. It not only ensures the accuracy of the phase sequence detection results, but also ensures the reliability of the emergency equipment power supply.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention or the prior art more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only For some embodiments of the present invention, for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

FIG. 1 is a schematic structural diagram 1 of a portable automatic phase sequence detection device disclosed in the present invention.

FIG. 2 is a schematic structural diagram 2 of a portable automatic phase sequence detection device disclosed in the present invention.

FIG. 3 is a circuit schematic diagram of a portable automatic phase sequence detection device disclosed in the present invention.

FIG. 4 is a logical block diagram of a portable automatic phase sequence detection device disclosed in the present invention.

The names of the parts represented by the numbers or letters in the figure are:

1-box body; 101-universal wheel; 102-box body; 103-door lock; 104-handle; 2-breaker; 201-breaker body; 202-breaker closing mechanism; 203-breaker branch gate mechanism; 3-automatic phase sequence detection system; 301-first relay; 302-first power control relay; 303-second power control relay; 304-third power control relay; 305-fourth power control relay; 306 - phase sequence detection switch; 307-phase sequence same indicator; 308-phase sequence different indicator; 309-quasi-synchronization controller; 4-cable interface; 401-input A-phase interface; 402-input B-phase interface; 403- Input C-phase interface; 404-input N-phase interface; 405-output A-phase interface; 406-output B-phase interface; 407-output C-phase interface; 408-output N-phase interface; 5-opening and closing switch; 6-voltage Current display device; 601-power multi-function meter; 602-current signal detection device; 7-electricity inspection port; 8-transfer cable.

Detailed ways

The specific embodiments of the present invention will be briefly described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, those of ordinary skill in the art can obtain all other implementations without creative work. For example, all belong to the protection scope of the present invention.

Figures 1 to 4 show preferred embodiments of the present invention, which are analyzed in detail from different angles.

A portable automatic phase sequence detection device as shown in Figures 1 and 2 includes a box body 1 , a circuit breaker 2 , a cable interface 4 , an opening and closing switch 5 and an automatic phase sequence detection system 3 .

The box body 1 includes a box body 102, a handle 104, a door lock 103 with a fingerprint recognition function, and a universal wheel 101. The box body 102 is a double-layer door structure, which effectively isolates the automatic phase sequence detection synchronization cable transfer box. It avoids the problem that the operator accidentally touches the electrified body and causes the operator to get electric shock, and ensures the safety of the operator when the emergency equipment is connected to the user. At the same time, since the bottom of the box body 1 is installed with a universal wheel 101 and a handle 104 and is small in size, it is easy to access and move, and can meet the space requirements of various working conditions.

The circuit breaker 2 is installed in the box 1, and includes a circuit breaker body 201, a circuit breaker closing mechanism 202, and a circuit breaker opening mechanism 203. The opening and closing switch 5 is respectively connected with the circuit breaker closing mechanism 202 and the circuit breaker opening mechanism 203. connect.

The cable interface 4 is installed on both sides of the box body 1 and has insulation protection, including an input cable interface and an output cable interface. The input cable interface includes an input N-phase interface 404 and a phase A, B-phase, and C-phase terminal of the input end of the circuit breaker 2 respectively. The input A-phase interface 401 , the input B-phase interface 402 , and the input C-phase interface 403 are connected. The output cable interface includes an output N-phase interface 408, an output A-phase interface 405, an output B-phase interface 406, an output C-phase interface 407, which are respectively connected to the A-phase, B-phase, and C-phase terminals of the output terminal of the circuit breaker 2, and an input N-phase interface. 404 is connected to the output N-phase interface 408 . Specifically, the input cable interface is a quick connector or a copper bar, and the output cable interface is a quick connector. The cable interface 4 is connected with the circuit breaker 2 by cables or copper bars. The output cable interface is connected with a transfer cable 8, one end of the transfer cable 8 is a quick connector connected to the output cable interface, and the other end is equipped with a variety of interface forms that can be matched with various interfaces of the low-voltage distribution network. The specific interface forms are: Copper terminals or quick connectors or drain clips.

As shown in FIG. 3 , the automatic phase sequence detection system 3 includes a phase sequence detection switch 306 , a first power control relay 302 , a second power control relay 303 , a third power control relay 304 , a fourth power control relay 305 , and a first relay 301 , an indicator light 307 with the same phase sequence and an indicator light 308 with a different phase sequence. The A-phase, B-phase and C-phase of the power supply of the first power supply control relay 302 are respectively connected with the A-phase, B-phase and C-phase of the input terminal of the circuit breaker 2; the power supply-phase A, B-phase and C-phase of the second power supply control relay 303 are respectively It is connected with the C-phase, B-phase and A-phase of the input terminal of the circuit breaker 2; The A-phase, B-phase, and C-phase of the power supply of the four-power-source control relay 305 are respectively connected to the C-phase, B-phase, and A-phase of the output terminal of the circuit breaker 2 . A group of normally open contacts of the first power supply control relay 302 are connected in series with a group of normally open contacts of the third power supply control relay 304 , and a group of normally open contacts of the second power supply control relay 303 are connected to a group of normally open contacts of the fourth power supply control relay 304 . One group of normally open contacts is connected in series, and the two groups of power control relays are connected in parallel as a whole after being connected in series. Connect the other end of the open point. The first relay 301 includes two sets of normally open contacts and one set of normally closed contacts, one set of normally open contacts is connected to the indicator light 307 in the same phase sequence, the other set is connected in series with the opening and closing switch 5, and one set of normally closed contacts is connected. The dots are connected to the out of phase sequence indicator 308 .

Further, the device also includes a voltage and current display device 6, and the voltage and current display device 6 includes a current signal detection device 602 installed on the cable or copper bar connected to the cable interface 4 and the circuit breaker 2, and a current signal detection device 602 for displaying voltage, current, power. , the frequency of the power multi-function meter 601.

Further, the device also includes a quasi-synchronized controller 309 for comparing voltage amplitude and phase angle, which provides conditions for the parallel operation of the mobile box-transformer and the low-voltage cable car with the user, greatly improving the reliability of power supply.

Further, the device also includes a power inspection port 7, the power inspection port 7 includes an input power inspection port and an output power inspection port, the input power inspection port is connected with the input end of the circuit breaker 2, and the output power inspection port is connected with the output end of the circuit breaker 2. , the electricity inspection port 7 has insulation protection and anti-shock structure.

As shown in Figure 4, using the above-mentioned portable automatic phase detection and sequence device for operation, including the following steps:

(1) Connect the self-contained cable of the emergency equipment to the input cable interface of the portable automatic phase sequence detection device. One end of the transfer cable 8 is connected to the output cable interface of the portable automatic phase sequence detection device, and the other end is connected to the low-voltage power grid.

(2) Press the phase sequence detection switch 306, and the automatic phase sequence detection system 3 starts to work.

(3) If the power supply of the input cable interface and the output cable interface are both in positive phase sequence, the first power supply control relay 302 and the third power supply control relay 304 are activated, and the corresponding normally open contacts are closed. At this time, the phase sequence is the same, and the first relay 301 When the power is turned on, the indicator light 307 in the same phase sequence works, and the circuit breaker 2 is allowed to close. Operate the opening and closing switch 5, the circuit breaker closing mechanism 202 is energized, the circuit breaker 2 is closed, and the emergency equipment power is transmitted to the low-voltage distribution network;

If the power supply of the input cable interface is in positive phase sequence, and the power supply of the output cable interface is in reverse phase sequence, the first power control relay 302 and the fourth power control relay 305 are activated, and the corresponding normally open contacts are closed. 301 does not act, the phase sequence is different, the indicator 308 works, and the circuit breaker 2 is prohibited from closing. At this moment, any two phases at the end of the connection between the transfer cable 8 and the output cable interface are exchanged, and the automatic phase detection sequence is performed again;

If the input cable interface power supply is in reverse phase sequence and the output cable interface power supply is in positive phase sequence, the second power supply control relay 303 and the third power supply control relay 304 are activated, the corresponding normally open contacts are closed, and the phase sequence is different at this time, the first relay 301 does not act, the phase sequence is different, the indicator 308 works, and the circuit breaker 2 is prohibited from closing. At this moment, any two phases at the end of the connection between the transfer cable 8 and the output cable interface are exchanged, and the automatic phase detection sequence is performed again;

If the power supply of the input cable interface and the output cable interface are in reverse phase sequence, the second power supply control relay 303 and the fourth power supply control relay 305 are activated, and the corresponding normally open contacts are closed. At this time, the phase sequence is the same, and the first relay 301 is activated , the same phase sequence indicator 307 works, the circuit breaker 2 is allowed to close. When the opening and closing switch 5 is operated, the circuit breaker closing mechanism 202 is energized, the circuit breaker 2 is closed, and the emergency equipment power is transmitted to the low-voltage distribution network.

To sum up, a portable automatic phase sequence detection device disclosed in the present invention firstly uses the power supply control relay to detect the phase sequence types of the three-phase power supply of different lines or different groups of transformers, and then uses the power supply control relay to reverse the phase connection mode. By comparing the above phase sequence categories, it can be reliably detected whether the phase sequence of any low-voltage power supply is the same. It not only solves the problem that the automatic phase checking device in the prior art can only detect whether the three-phase power supply phases of the same group of transformers in the same line are the same and reliable, but also solves the problems of low safety and complicated operation of manual detection of phase sequence. , which provides a guarantee for the safe and rapid power supply of emergency equipment. At the same time, the phase sequence detection device is also equipped with a cable interface and a transfer cable. The emergency equipment can be easily and quickly connected to the low-voltage power grid by using its own cable, which solves the problems of on-site modification of emergency equipment cables and repeated cable purchases, saving a lot of money. Human and material resources.

The foregoing description of the disclosed embodiments enables those skilled in the art to make and use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit and scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A portable automatic phase sequence detection device, comprising a box body (1), a circuit breaker (2), a cable interface (4), an opening and closing switch (5) and an automatic phase sequence detection system (3), characterized in that , the automatic phase sequence detection system (3) includes a phase sequence detection switch (306), a first relay (301), an indicator light (307) with the same phase sequence, an indicator light (308) with a different phase sequence, and two sets of power supply control relays Each group of two said power control relays is connected to the input end and output end of the circuit breaker (2) respectively, and the two groups of power control relays are connected to the input end and output end of the circuit breaker (2) in opposite phase sequences; A group of normally open contacts of the power control relay are connected in series, the two groups of power control relays are connected in series and then connected in parallel, and the coils of the first relay (301) are respectively connected with the other ends of the normally open contacts of the two groups of power control relays in series; The first relay (301) includes two groups of normally open contacts and one group of normally closed contacts, one group of normally open contacts is connected to the indicator light (307) with the same phase sequence, and the other group is connected to the opening and closing switch (5). ) are connected in series, and a group of normally closed contacts is connected with the indicator lights (308) with different phase sequences. 2. A portable automatic phase sequence detection device according to claim 1, wherein the power control relays are respectively a first power control relay (302), a second power control relay (303), a third power supply A control relay (304) and a fourth power supply control relay (305); the power supply phases A, B and C of the first power supply control relay (302) are connected to the input terminals A, B and C of the circuit breaker (2) , the power supply phases A, B and C of the second power supply control relay (303) are connected to the input terminals C, B and A of the circuit breaker (2), and the power supply phases A, B and A of the third power supply control relay (304) Phases B and C are connected to the output terminals A, B and C of the circuit breaker (2), and the power supply phases A, B and C of the fourth power control relay (305) are connected to the output terminal C of the circuit breaker (2). Phase, Phase B, Phase A are connected. 3. A portable automatic phase sequence detection device according to claim 2, wherein the circuit breaker (2) comprises a circuit breaker body (201), a circuit breaker closing mechanism (202), a circuit breaker opening Mechanism (203), the opening and closing switch (5) is respectively connected with the circuit breaker closing mechanism (202) and the circuit breaker opening mechanism (203); the cable interface (4) is installed on two sides of the box (1). side, including an input cable interface and an output cable interface, the input cable interface includes an input N-phase interface (404) and an input A-phase interface (404) respectively connected to the A-phase, B-phase, and C-phase terminals of the input terminals of the circuit breaker (2). 401), an input B-phase interface (402), and an input C-phase interface (403); the output cable interface includes an output N-phase interface (408) and a circuit breaker (2) output terminal A-phase, B-phase, C-phase respectively The terminals are connected to the output A-phase interface (405), the output B-phase interface (406), and the output C-phase interface (403). The input N-phase interface (404) is connected to the output N-phase interface (408). 4. a kind of portable automatic phase sequence detection device according to claim 3, is characterized in that, described input cable interface is quick connector or copper bar, described output cable interface is quick connector; Described cable interface ( 4) Connect with the circuit breaker (2) by cables or copper bars. 5. A portable automatic phase sequence detection device according to claim 4, wherein the output cable interface is connected with an adapter cable (8), and one end of the adapter cable (8) is an interface with the output cable The connected quick connector, the other end is equipped with a variety of interface forms that can be matched with various forms of interfaces of the low-voltage distribution network. 6. A portable automatic phase sequence detection device according to claim 5, characterized in that, the interface configured at one end of the transfer cable (8) connected to the low-voltage power distribution network is in the form of a copper terminal or a quick connector or a Drainage clamp. 7. A portable automatic phase sequence detection device according to claim 1, characterized in that, the device further comprises a voltage and current display device (6), and the voltage and current display device (6) comprises a device mounted on a cable interface ( 4) A current signal detection device (602) on the cable or copper bar connected to the circuit breaker (2), and a power multi-function meter (601) for displaying voltage, current, power and frequency. 8. A portable automatic phase sequence detection device according to claim 1, characterized in that, the device further comprises a quasi-synchronized controller (309) for comparing voltage amplitude and phase angle. 9. a kind of portable automatic phase sequence inspection device according to claim 1, is characterized in that, described device also comprises electricity inspection port (7), and described electricity inspection port (7) comprises input electricity inspection port and output inspection port Electric port, the input electric inspection port is connected with the input end of the circuit breaker (2), the output electric inspection port is connected with the output end of the circuit breaker (2), and the electric inspection port (7) is provided with an insulation protection and an anti-shock structure. 10 . The portable automatic phase sequence detection device according to claim 1 , wherein the box body ( 1 ) comprises a box body body ( 102 ), a handle ( 104 ), a door lock ( 103) and a universal wheel (101), the box body (102) is a double door structure.

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