Metering test junction box capable of adjusting phase sequence without power cut

Abstract

The invention relates to a metering test junction box capable of adjusting a phase sequence without power cut, and relates to the technical field of electric energy metering, the metering test junction box comprises a box cover and a box body, A, B and C phase voltage connecting units and A and C phase current connecting units are arranged in the box body in parallel, and each voltage connecting unit comprises a voltage input contact block, a voltage connecting piece, an L-shaped voltage transition block and a voltage output contact block. The current connection unit comprises an L-shaped current input contact block, a P-shaped current output contact block, a square current output contact block, a rectangular current output contact block and a current connection sheet. Part of the input and output contact blocks are provided with test wire plugging holes, and the box body is internally provided with a voltage and current transition sheet used for adjusting the phase sequence. By the adoption of the lifting type voltage and current connecting piece, short circuit is more time-saving and safer, loop disconnection is achieved by rotating the connecting piece downwards, and screw turning operation is reduced. And meanwhile, phase sequence adjustment is realized without power failure, and the power supply reliability is improved.

Description

Technical Field

[0001] The invention relates to a metering test junction box for adjusting phase sequence without power outage, belonging to the technical field of junction boxes. Background Art

[0002] During the acceptance process after the completion of the new installation of energy metering business expansion, it is necessary to check the energy metering and circuit phase sequence arrangement after power is supplied. At present, after the 10kV business expansion and new installation is powered on, the energy meter often shows a reverse phase sequence, especially in the case of high-supply and high-metering three-phase three-wire wiring, which will cause power calculation errors, and the phase sequence needs to be adjusted to achieve normal operation of the energy meter and terminal. In addition, the energy metering cycle operation includes rotating or replacing faulty energy meters and terminals.

[0003] In the prior art, the solution to the reverse phase sequence is to change the primary wiring or the secondary wiring. The defects are: when the primary cable and the secondary wiring have been laid, it takes a long time to change the wiring, and even the cable needs to be replaced or the secondary wiring is wrong. And it is necessary to adjust the wiring at the lower end of the metering junction box in the power outage state to adjust the phase sequence, which not only affects the normal power consumption of the user, but also the wiring colors of the upper and lower ends of the junction box do not correspond after the phase sequence is adjusted, which affects the staff's accurate judgment of the phase sequence and also affects the neatness and beauty of the wiring; in the process of replacing the electric energy meter and the terminal, the prior art needs to cut off the power of the electric energy meter and the terminal at the same time. At this time, it is impossible to provide a reference basis for the undercounted electricity during the meter replacement period, and the accuracy of the method of manually calculating the make-up electricity is controversial and difficult to be recognized by users. The junction box in the prior art cannot simultaneously meet the requirements of adjusting the phase sequence without power outage and uninterrupted electricity metering during power outage.

[0004] Patent CN217642582U discloses a junction box for adjusting the reverse phase sequence of an electric energy meter. The patent includes an upper junction box and a lower junction box. The upper junction box has a built-in bipolar switch, and the lower junction box has a built-in wiring type metering junction box. One end of the bipolar switch is connected to the electric energy meter, and the other end is connected to the wiring type metering junction box. The built-in bipolar switch can complete the change of the secondary wiring at one time, which is convenient for operation; but the phase sequence adjustment of the current loop cannot be achieved; at the same time, the added upper junction box makes the overall junction box larger. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a metering test junction box capable of adjusting phase sequence without power outage.

[0006] The technical solution of the present invention is as follows:

[0007] A metering test junction box for adjusting phase sequence without power outage comprises a box cover and a box body, wherein A\B\C phase voltage connection units are arranged inside the box body, current connection units A\C phases are arranged between adjacent voltage connection units, and each connection unit is separated by an insulating partition; the structure is only a three-phase three-wire wiring mode, and a three-phase four-wire will increase one voltage and current connection unit accordingly.

[0008] The access end is provided with seven inlet holes, and the outlet end is provided with fourteen outlet holes.

[0009] Preferably, the A-phase voltage connection unit has a voltage output contact block, a wire fastening screw hole, a test line plug-in hole, a voltage connecting piece, an L-shaped voltage transition block, and a voltage input contact block. The A-phase current connection unit is provided with a P-shaped / square / rectangular current output contact block, a wire fastening screw hole, a test line plug-in hole, a current connecting piece, and an L-shaped current input contact block; the other voltage and current connection units have the same structure as the A-phase voltage and current connection unit.

[0010] Preferably, a long strip slot is provided on the left side of the box body, and a corresponding long strip buckle protrusion is provided on the inner side of the box cover, and the long strip protrusion cooperates with the slot to achieve a tight fit to ensure that the outlet end mark on the box cover is at the top and the access end mark is at the bottom; through holes and holes are provided on the right side of the box cover and the box body so that they can be fixedly connected by lead sealing screws.

[0011] Preferably, the voltage and current connecting piece includes an insulating spiral column, a connecting part, and a thread; the connecting part short-circuits the input and output contact blocks; the thread fixes the entire connecting piece in the screw hole of the box body base; the insulating spiral column lifts and lowers the connecting piece in the vertical direction through the ear-shaped terminal button to separate and connect the connecting piece and the contact block. The test line plug-in hole is electrically connected to the voltage and current output, the input contact block, and the L-shaped voltage transition block.

[0012] Preferably, the voltage output contact block and the input contact block of the A-phase voltage connection unit are provided with access and outlet wire jacks on the sides, and wire fastening screw holes are provided to fix the input and output wires. The side structure of the current input and output contact blocks of the A-phase current connection unit is the same as the structure of the A-phase voltage connection block. All types of voltage and current contact blocks are embedded in the box body. The wire fixing structure and contact block embedded structure of the other voltage and current connection units are the same as those of the A-phase voltage and current connection unit.

[0013] Preferably, the voltage output and input contact blocks of the A-phase voltage connection unit are ┓-shaped platforms near the voltage connecting piece end, and the voltage input and output contact blocks are electrically connected after the connecting piece screws are unscrewed. The L-shaped current input and output contact blocks of the A-phase current connection unit are both ┓-shaped platforms near the current connecting piece end, and the current input and output contact blocks are electrically connected after the connecting piece screws are unscrewed. The voltage connecting piece and the current connecting piece have different colors to distinguish the voltage and current connection units.

[0014] Preferably, one end of the voltage and current phase sequence transition piece is connected to the voltage and current input contact block, and the other end is a ┓-shaped platform for short-circuiting the pieces.

[0015] Preferably, the voltage and current input and output contact blocks, voltage / current connectors, and test line plug-in holes are made of copper-zinc alloy or galvanized iron alloy. The box base is made of transparent high-molecular polycarbonate, and the box cover is made of transparent ABS plastic.

[0016] The present invention has the following beneficial effects:

[0017] The metering test junction box for adjusting phase sequence without power outage of the present invention can adjust the phase sequence by adjusting the secondary connection line at the access end of the junction box. The phase sequence adjustment metering test junction box has the advantages of convenience, speed, safety, reliability, cost saving, etc., and can complete the wiring adjustment without power outage, which has a significant effect on improving the comprehensive benefits of power supply enterprises.

[0018] In the present invention, the test line plug-in hole of the junction box is electrically connected to the L-shaped voltage transition block, the P-shaped current output contact block, the L-shaped current input contact block, and the rectangular current output contact block, so the test line of the electric energy meter calibrator is directly plugged into the test line plug-in hole to realize the voltage parallel connection and current series connection functions, and the efficiency of on-site verification is greatly improved without the need to adopt traditional operation methods. At the same time, the voltage connecting piece and the current connecting piece are separated and combined by rotating the connecting piece screw, without the use of any tools, and the operation is simple, convenient and safe, eliminating the traditional cumbersome operation of disconnecting the connecting piece, and improving the convenience and safety of the operation.

[0019] In the present invention, the up and down directions are marked on the junction box and the box cover to prevent the junction box from being connected incorrectly or being reversed.

[0020] In the present invention, the size and installation hole of the junction box are similar to those of the traditional junction box, which is convenient for on-site installation. At the same time, considering safety, spring components and active electronic devices are not used to solve other problems of the traditional junction box.

[0021] In the present invention, the voltage output end has at least two wiring jacks and the current output end has at least four wiring jacks, which can meet the simultaneous access of two electric energy meters or the electric energy meter and the load control terminal. Through the voltage output connector, the voltage phase sequence adjustment connector, the current phase sequence adjustment connector, and the current output connector, seamless metering of user power consumption is achieved when the electric energy meter is replaced without losing the electric energy metering data.

[0022] In the present invention, an insulating partition is arranged inside the junction box body to separate different wiring areas, so that different phases can be clearly identified during operation, and the arc generated during a fault can be blocked to avoid phase-to-phase short circuits caused by circuits or by operator operation, thereby further expanding the scope of losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of a metering test junction box for adjusting phase sequence without power outage of the present invention;

[0024] Figure 2 It is a schematic diagram of the box cover structure of the present invention;

[0025] Figure 3 It is a schematic diagram of the connected piece structure of the present invention;

[0026] Figure 4 It is a schematic diagram of the connection structure of the current wiring unit of the present invention;

[0027] Figure 5 It is a schematic diagram of the connection structure of the voltage wiring unit of the present invention;

[0028] Figure 6 This is a schematic diagram before the phase sequence adjustment of the present invention;

[0029] Figure 7 This is a schematic diagram after the phase sequence is adjusted according to the present invention;

[0030] Figure 8 It is the test junction box, electric energy meter, load control terminal and secondary circuit wiring diagram of the present invention;

[0031] The reference numerals in the figure are as follows:

[0032] 1. C-phase voltage connection unit; 2. C-phase current connection unit; 3. Wire fastening screw hole; 4. Current phase sequence transition piece; 5. B-phase voltage connection unit; 7. Rectangular current output contact block; 8. A-phase current connection unit; 9. Square current output contact block; 10. P-shaped current output contact block; 11. A-phase voltage connection unit; 12. Voltage output contact block; 13. Box body fixing screw hole; 14. Box cover slot; 15. Voltage output connection piece; 16. L shaped voltage transition block; 17, voltage phase sequence adjustment connecting piece; 18, voltage input contact block; 19, voltage phase sequence transition piece; 20, current phase sequence adjustment connecting piece; 21, L-shaped current input contact block; 22, current output connecting piece; 23, test line plug-in hole; 24, insulating partition; 25, box cover screw hole; 26, box cover; 27, buckle; 28, lead seal screw hole; 29, insulating spiral column; 30, connecting part; 32, access line jack; 33, ┓-shaped platform. DETAILED DESCRIPTION

[0033] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] See also Figures 1 to 8 , the invention provides a technical solution:

[0035] A metering test junction box for adjusting phase sequence without power outage, comprising a box cover 26 and a box body;

[0036] The box cover 26 includes: a buckle 27, a lead-sealed screw hole 28, and an outlet side mark and an inlet side mark.

[0037] The box body is provided with an A-phase voltage connection unit 11, a B-phase voltage connection unit 5 and a C-phase voltage connection unit 1, an A-phase current connection unit 8 and a C-phase current connection unit 2; the B-phase voltage connection unit 5 and the C-phase voltage connection unit 1 have the same structure as the A-phase voltage connection unit 11; the C-phase current connection unit 1 has the same structure as the A-phase, and the A-phase voltage connection unit 11, the A-phase current connection unit 8, the B-phase voltage connection unit 5, the C-phase current connection unit 2 and the B-phase voltage connection unit 1 are arranged in sequence from left to right.

[0038] The A-phase voltage connection unit 11 includes: a voltage output contact block 12, a wire fastening screw hole 3, a voltage output connecting piece 15, a test line plug hole 23, an L-shaped voltage transition block 16, a test line plug hole 23, a voltage phase sequence adjustment connecting piece 17, and a voltage input contact block 18;

[0039] The A-phase current connection unit 8 includes: a rectangular current output contact block 7, a square current output contact block 9, a P-shaped current output contact block 10, a current phase sequence adjustment connecting piece 20, an L-shaped current input contact block 21, a current output connecting piece 22, a test line plug-in hole 23, and a connecting piece limit block.

[0040] The box body further includes a plurality of insulating partitions 24, which are respectively arranged between the A-phase voltage connection unit 11, the A-phase current connection unit 8, the B-phase voltage connection unit 5, the C-phase current connection unit 2 and the C-phase voltage connection unit 1.

[0041] The A-phase voltage connection unit 11 has one connection socket 32 ​​on the input side and two connection sockets 32 on the output side; the A-phase current connection unit 8 has two connection sockets 32 on the input side and four connection sockets 32 on the output side.

[0042] The box cover 26 includes a buckle 27, a lead-sealing screw hole 28, and an input-end mark and an output-end mark; a long strip-shaped box cover slot 14 is provided on the left side of the box body, and the buckle 27 cooperates with the box cover slot 14 to achieve a tight fit to ensure that the output-end mark is on the top and the input-end mark is on the bottom; a box body fixing screw hole 13 is provided on the right side of the box body, and the box body is also provided with a box cover screw hole 25 corresponding to the lead-sealing screw hole 28, and the box cover 26 and the box body are fixed by the lead-sealing screw.

[0043] In this embodiment, the voltage output connecting piece 15, the voltage phase sequence adjustment connecting piece 17, the current phase sequence adjustment connecting piece 20 and the current output connecting piece 22 have the same structure, and all include: an insulating spiral column 29, a connecting portion 30 and a thread 31. Between the voltage input contact block 18 and the L-shaped voltage transition block 16, between the L-shaped voltage transition block 16 and the voltage output contact block 12, between the L-shaped voltage transition block 16 and the voltage phase sequence transition piece 19, between the P-shaped current output contact block 10 and the current phase sequence adjustment connecting piece 20, between the P-shaped current output contact block 10 and the L-shaped current input contact block 21, between the square current output contact block 9 and the L-shaped current input contact block 21, between the rectangular current output contact block 7 and the L-shaped current input contact block 21, and between the rectangular current contact block 7 and the current phase sequence adjustment connecting piece 20, the upper end shape is a ┓-shaped platform 33, so that each connecting piece can form an electrical connection with each contact block.

[0044] In this embodiment, the test line plug-in hole 23 is electrically connected to the L-shaped voltage transition block 16 , the P-shaped current output contact block 10 , the L-shaped current input contact block 21 , and the rectangular current output contact block 7 .

[0045] In this embodiment, the L-shaped current input contact block 21, the P-shaped current output contact block 10, the square current output contact block 9, the rectangular current output contact block 7, the voltage input contact block 18, the voltage output contact block 12, the voltage phase sequence adjustment connecting piece 17, the voltage output connecting piece 15, the current phase sequence adjustment connecting piece 20, the current output connecting piece 22 and the test line plug-in hole 23 are made of copper-zinc alloy or galvanized iron alloy;

[0046] In this embodiment, the box body is made of green high molecular weight polycarbonate, and the box cover 26 is made of transparent ABS plastic material.

[0047] More specific instructions for using the junction box: During normal operation, if Figure 6 The diagram shows the schematic diagram of the junction box structure when the phase sequence is ABC. In the A-phase voltage wiring unit 11, the voltage output connecting piece 15 is rotated out to electrically connect the L-shaped voltage transition block 16 and the voltage output contact block 12, and the voltage phase sequence adjustment connecting piece 17 is placed between the voltage input contact block 18 and the L-shaped voltage transition block 16 and rotated out to form an electrical connection. In the A-phase current wiring unit 8, the current output connecting piece 22 between the P-shaped current output contact block 10 and the L-shaped current input contact block 21 is rotated out to form an electrical connection, and the current phase sequence adjustment connecting piece 20 between the rectangular current output contact block 7 and the L-shaped current input block 21 is rotated out to form an electrical connection. After the current phase sequence adjustment connecting piece 20 and the current output connecting piece 22 at other positions are rotated in and locked to the position, the contact blocks on both sides will not be electrically connected. The other phase voltage and current wiring units perform the same operation, so that the phase sequence of the electric energy meter and the terminal access is ABC.

[0048] like Figure 7 The diagram shows the schematic diagram of the junction box structure when the phase sequence is CBA. In the A-phase voltage wiring unit 11, the voltage output connecting piece 22 is rotated out to electrically connect the L-shaped voltage transition block 16 and the voltage output contact block 12, and the voltage phase sequence adjustment connecting piece 17 is placed between the voltage phase sequence transition piece 19 and the L-shaped voltage transition block 16 and rotated out to form an electrical connection. In the A-phase current wiring unit 8, the current phase sequence adjustment connecting piece 20 between the P-shaped current output contact block 10 and the current phase sequence transition piece 4 is rotated out to form an electrical connection, and the current phase sequence adjustment connecting piece 20 between the rectangular current output contact block 7 and the current phase sequence transition piece 4 is rotated out to form an electrical connection. After the current phase sequence adjustment connecting piece 20 and the current output connecting piece 22 at other positions are rotated in and locked to the position, the connecting blocks on both sides will not be electrically connected. The other phase voltage and current wiring units perform the same operation, so that the phase sequence of the electric energy meter and the terminal access is CBA.

[0049] The A-phase voltage of the voltage transformer is input from the voltage input contact block 18 of the A-phase voltage connection unit 11, and is electrically connected to the L-shaped voltage transition block 16 through the voltage phase sequence adjustment connecting piece 17, and then electrically connected to the voltage output contact block 12 through the voltage output connecting piece 15; thereby, the A-phase voltage of the voltage transformer is connected to the electric energy meter and the load control terminal. The A-phase current of the current transformer is input from the L-shaped current input contact block 21 of the A-phase current connection unit, the polarity end of the current transformer is connected to the left L-shaped current input contact block 21, and is electrically connected to the P-shaped current output contact block 10 through the current output connecting piece 22; the non-polarity end of the current transformer is connected to the right L-shaped current input contact block 21, and is electrically connected to the rectangular current output contact block 7 through the current phase sequence adjustment connecting piece 20; the current transformer current flows through the L-shaped current input contact block 21, the current phase sequence adjustment connecting piece 20 and the current output connecting piece 22, the P-shaped current output contact block 10, the electric energy meter, the square current output contact block 9, the negative control terminal, and finally flows out from the rectangular current output contact block 7, the current phase sequence adjustment connecting piece 20 and the current output connecting piece 22, and the L-shaped current input contact block. The electric energy meter, the negative control terminal and the current transformer current secondary circuit are connected in series.

[0050] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A measurement test junction box for adjusting phase sequence without power outage, comprising a box cover (26) and a box body, characterized in that: The box body is provided with an A-phase voltage connection unit (11), an A-phase current connection unit (8), a B-phase voltage connection unit (5), a C-phase current connection unit (2) and a C-phase voltage connection unit (1) in sequence from left to right; the A-phase voltage connection unit (11), the B-phase voltage connection unit (5) and the C-phase voltage connection unit (1) have the same structure; the A-phase current connection unit (8) and the C-phase current connection unit (2) have the same structure; the A-phase voltage connection unit (11), the B-phase voltage connection unit (5) and the C-phase voltage connection unit (1) have a voltage input contact block (18) at their input ends, two voltage output contact blocks (12) at their output ends, and an L-shaped voltage transition block (16) in the middle; the A-phase current connection unit (8) and the C-phase current connection unit (2) have two L-shaped current input contact blocks (21) at their input ends, and a P-shaped current output contact block (10), a square current output contact block (9) and a rectangular current output contact block (7) at their output ends.

2. A measurement test junction box for adjusting phase sequence without power outage as claimed in claim 1, characterized in that: The box cover (26) comprises a buckle (27), a lead-sealing screw hole (28), an input terminal mark and an output terminal mark; a long strip-shaped box cover slot (14) is arranged on the left side of the box body, and the buckle (27) cooperates with the box cover slot (14) to achieve a tight fit, so as to ensure that the output terminal mark is on the top and the input terminal mark is on the bottom; a box body fixing screw hole (13) is arranged on the right side of the box body, and a box cover screw hole (25) corresponding to the lead-sealing screw hole (28) is also arranged on the box body, and the box cover (26) and the box body are fixed by the lead-sealing screw.

3. A measurement test junction box for adjusting phase sequence without power outage as claimed in claim 1, characterized in that: The A-phase voltage connection unit (11) further comprises a test line plug-in hole (23), a voltage phase sequence adjustment connecting piece (17) and a voltage output connecting piece (15); the voltage phase sequence adjustment connecting piece (17) is arranged between the voltage input contact block (18) and the L-shaped voltage transition block (16); the voltage output connecting piece (15) is arranged between the L-shaped voltage transition block (16) and the voltage output contact block (12); the test line plug-in hole (23) is electrically connected to the voltage output contact block (12), the voltage input contact block (18) and the L-shaped voltage transition block (16).

4. A measurement test junction box for adjusting phase sequence without power outage as claimed in claim 3, characterized in that: The A-phase current connection unit (8) further comprises a test line plug-in hole (23), a current phase sequence adjustment connecting piece (20) and a current output connecting piece (22); the polarity end of the current transformer is connected to the left L-shaped current input contact block (21), and is electrically connected to the P-shaped current output contact block (10) through the current output connecting piece (22); the non-polarity end of the current transformer is connected to the right L-shaped current input contact block (21), and is electrically connected to the rectangular current output contact block (7) through the current phase sequence adjustment connecting piece (20); the test line plug-in hole (23) is electrically connected to the rectangular current output contact block (7), the L-shaped voltage transition block (16), the P-shaped current output contact block (10), and the L-shaped current input contact block (21).

5. A measurement test junction box for adjusting phase sequence without power outage as claimed in claim 1, characterized in that: The box body further comprises a plurality of insulating partitions (24), wherein the plurality of insulating partitions (24) are respectively arranged between adjacent A-phase voltage connection units (11), A-phase current connection units (8), B-phase voltage connection units (5), C-phase current connection units (2) and C-phase voltage connection units (1).

6. A measurement test junction box for adjusting phase sequence without power outage as claimed in claim 3, characterized in that: The voltage phase sequence adjustment connecting piece (17) and the voltage output connecting piece (15) both comprise an insulating spiral column (29) and a connecting portion (30); the connecting portion (30) is fixed to the middle of the voltage phase sequence adjustment connecting piece (17) and the voltage output connecting piece (15); the insulating spiral column (29) is installed on the top of the connecting portion (30); the connecting portion (30) forms a short circuit with the voltage input contact block (18) and the voltage output contact block (12).

7. A measurement test junction box for adjusting phase sequence without power outage as claimed in claim 3, characterized in that: The voltage output contact block (12) and the voltage input contact block (18) of the A-phase voltage connection unit (11) are provided with an incoming line jack (32), an outgoing line jack and a wire fastening screw hole (3) on the side of the input end thereof for fixing the incoming and outgoing wires; the rectangular current output contact block (7), the square current output contact block (9), the P-shaped current output contact block (10) and the L-shaped current input contact block (21) of the A-phase current connection unit (8) are provided with an incoming line jack (32), an outgoing line jack and a wire fastening screw hole (3) on the side of the input end thereof for fixing the incoming and outgoing wires.

8. A measurement test junction box for adjusting phase sequence without power outage as claimed in claim 3, characterized in that: The end of the voltage input contact block (18) of the A-phase voltage connection unit (11) close to the voltage phase sequence adjustment connecting piece (17) and the end of the voltage output contact block (12) close to the voltage output connecting piece (15) are both arranged as a ┓-shaped platform (33); the L-shaped current input contact block (21), the P-shaped current output contact block (10), the square current output contact block (9), and the rectangular current output contact block (7) of the A-phase current connection unit (8) close to the current phase sequence adjustment connecting piece (20) One end of the current output connecting piece (22) is configured as a ┓-shaped platform (33); and the current phase sequence transition piece (4) and a voltage phase sequence transition piece (19), one end of the voltage phase sequence transition piece (19) is connected to the voltage input contact block (18), and the other end of the voltage phase sequence transition piece (19) is connected to the ┓-shaped platform (33); one end of the current phase sequence transition piece (4) is connected to the L-shaped current input contact block (21), and the other end of the current phase sequence transition piece (4) is connected to the ┓-shaped platform (33).

9. A measurement test junction box for adjusting phase sequence without power outage as claimed in claim 2 or 3, characterized in that: The L-shaped current input contact block (21), the P-shaped current output contact block (10), the square current output contact block (9), the rectangular current output contact block (7), the voltage input contact block (18), the voltage output contact block (12), the voltage phase sequence adjustment connecting piece (17), the voltage output connecting piece (15), the current phase sequence adjustment connecting piece (20), the current output connecting piece (22) and the test line plug-in hole (23) are made of copper-zinc alloy or galvanized iron alloy; the thickness and width of the L-shaped current input contact block (21), the P-shaped current output contact block (10), the square current output contact block (9), the rectangular current output contact block (7), the voltage input contact block (18) and the voltage output contact block (12) are 5 mm to 7 mm, and the thickness of the voltage phase sequence adjustment connecting piece (17), the voltage output connecting piece (15), the current phase sequence adjustment connecting piece (20) and the current output connecting piece (22) is more than 3 mm.

10. A measurement test junction box for adjusting phase sequence without power outage as claimed in claim 2 or 3, characterized in that: The box body is made of transparent high-molecular polycarbonate material, and the box cover (26) is made of transparent ABS plastic material.

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