Metering wiring circuit of three-phase two-element electric energy meter and working method

Abstract

The invention relates to the technical field of transformer substation electric energy metering, and particularly discloses a three-phase two-element electric energy meter metering wiring circuit and a working method, the three-phase two-element electric energy meter metering wiring circuit comprises an electric energy meter body and an electric energy meter metering wiring box, the element I comprises an A-phase secondary measurement current coil, an A-phase secondary measurement voltage coil and a B-phase secondary measurement voltage coil, the element II comprises a C-phase secondary measurement current coil, a B-phase secondary measurement voltage coil and a C-phase secondary measurement voltage coil, and the electric energy meter metering junction box is provided with a voltage connecting piece and a current connecting piece. A wiring terminal on one side of the electric energy meter metering junction box is connected with a wiring terminal of the electric energy meter body, and a wiring terminal on the other side of the electric energy meter metering junction box is connected with a voltage transformer secondary measurement voltage winding and a current transformer secondary measurement current winding; when the electric energy meter needs to be replaced, the device has the advantages of simple operation, high efficiency, safety and reliability.

Description

Technical Field

[0001] The invention relates to the technical field of electric energy metering in transformer substations, and in particular to a three-phase two-element electric energy meter metering wiring circuit and a working method. Background Art

[0002] In substations, because of the symmetry of the three-phase load, the high-voltage power supply system is generally equipped with a three-phase two-element energy meter to measure the electrical equipment of substation users. Its working principle is to connect the secondary current of the A and C phases of the high-voltage current transformer to the current coil of the energy meter, and connect the A, B, C three-phase secondary voltage of the voltage transformer to the voltage coil of the energy meter. Under the action of the secondary voltage and secondary current, the measurement of electric energy is achieved.

[0003] like Figure 1 As shown, the three-phase two-element electric energy meter measurement wiring circuit in the prior art mainly includes the secondary voltage winding of the voltage transformer, the secondary measurement current winding of the current transformer, the electric energy meter body, the wire, etc. The working principle of the electric energy meter measurement wiring circuit is as follows:

[0004] The three-phase secondary voltage measuring windings of the voltage transformer, phase A, phase B and phase C, are respectively connected to the three-phase secondary voltage connection terminals a, d and g of the electric energy meter body through the secondary voltage measuring circuit breaker 1DK of the voltage transformer;

[0005] The A-phase secondary measurement current Ia* and Ia of the current transformer are connected to the connection terminals b and c of the A-phase secondary measurement current coil of element Ⅰ of the electric energy meter body through the secondary measurement current terminals S1 and S2 and the secondary measurement current wires respectively; the C-phase secondary measurement current Ic* and Ic of the current transformer are connected to the connection terminals e and f of the C-phase secondary measurement current coil of element Ⅱ of the electric energy meter body through the secondary measurement current terminals S1 and S2 and the secondary measurement current wires respectively.

[0006] The A-phase secondary measuring current Ia of the current transformer and the C-phase secondary measuring current Ic of the current transformer are reliably connected to the secondary current grounding wire after being short-circuited by a special current shorting metal sheet at the secondary current terminal block of the control cabinet door.

[0007] In the prior art, the electric energy meter needs to be calibrated after being used for a long time or needs to be replaced after a failure. We know that the secondary current circuit of the electric energy meter is not allowed to be open. The usual practice is to replace it after the high-voltage equipment is powered off, or to use a special short-circuit wire on the current terminal block to short-circuit the secondary current and ground it, and then perform a clamp current test to confirm the secondary current circuit of the electric energy meter. It is also necessary to disconnect the secondary side circuit breaker of the voltage transformer or remove the secondary side three-phase voltage fuse, and perform an electrical test at the secondary voltage terminal of the electric energy meter. After taking the above measures, the electric energy meter can be replaced. After the replacement is completed, the relevant safety measures are removed and the corresponding terminals are tightened. There is a complex operation process. There is a shunt current in the secondary current circuit of the electric energy meter. Disconnecting the secondary circuit breaker of the voltage transformer may also cause problems such as secondary measurement voltage and protection loss in a short time, and the operation risk is high.

[0008] Therefore, it is necessary to design a three-phase two-element electric energy meter measurement wiring circuit and working method to solve the problems of complex operation process and high operation risk of existing electric energy meter replacement operation. Summary of the invention

[0009] In view of the problems existing in the prior art, the object of the present invention is to provide a three-phase two-element electric energy meter measurement wiring circuit and a working method.

[0010] The technical solution adopted by the present invention to solve its technical problems is: a three-phase two-element electric energy meter measurement wiring circuit, including an electric energy meter body and an electric energy meter measurement wiring box, the electric energy meter body includes element I and element II, element I includes an A-phase secondary measurement current coil, an A-phase secondary measurement voltage coil and a B-phase secondary measurement voltage coil, element II includes a C-phase secondary measurement current coil, a B-phase secondary measurement voltage coil and a C-phase secondary measurement voltage coil, the electric energy meter measurement wiring box is provided with a voltage connecting piece and a current connecting piece, one side terminal of the electric energy meter measurement wiring box is connected to the terminal of the electric energy meter body, and the other side terminal of the electric energy meter measurement wiring box is connected to the secondary measurement voltage winding of the voltage transformer and the secondary measurement current winding of the current transformer.

[0011] Specifically, the voltage transformer secondary measurement voltage winding includes an A-phase secondary measurement voltage winding, a B-phase secondary measurement voltage winding, a C-phase secondary measurement voltage winding and a secondary side voltage circuit breaker, and the secondary side voltage circuit breaker controls the on and off of the three-phase secondary voltage of the voltage transformer.

[0012] Specifically, the A-phase secondary voltage measurement winding is connected to the Ua secondary voltage terminal of the energy meter measurement junction box through a secondary voltage circuit breaker via a wire;

[0013] The B-phase secondary voltage measurement winding is connected to the Ub secondary voltage terminal of the energy meter measurement junction box through a secondary voltage circuit breaker via a wire;

[0014] The C-phase secondary measurement voltage winding is connected to the Uc secondary voltage terminal of the electric energy meter measurement junction box through a wire via a secondary side voltage circuit breaker.

[0015] Specifically, the secondary measuring current winding of the current transformer includes an A-phase secondary measuring current winding and a C-phase secondary measuring current winding. The A-phase secondary measuring current winding is connected to the A-phase secondary current terminal on the electric energy meter measurement junction box through a wire; the C-phase secondary measuring current winding is connected to the C-phase secondary current terminal on the electric energy meter measurement junction box through a wire.

[0016] Specifically, three voltage connection pieces and four current connection pieces are provided in the electric energy meter measurement junction box. The voltage of the secondary measurement voltage winding of the voltage transformer is connected to the secondary measurement voltage terminal of the electric energy meter body through the voltage connection piece of the electric energy meter measurement junction box, and the current of the secondary measurement current winding of the current transformer is connected to the secondary measurement current terminal of the electric energy meter body through the current connection piece of the electric energy meter measurement junction box.

[0017] Specifically, the wire connecting the secondary voltage measuring winding of the voltage transformer to the electric energy meter measurement junction box adopts a cross-section of 1.5mm 2 Single strand copper core wire.

[0018] Specifically, the wire connecting the secondary current measuring winding of the current transformer to the electric energy meter measurement junction box adopts a cross-section of 2.5mm 2 Single strand copper core wire.

[0019] A working method of a three-phase two-element electric energy meter measurement wiring circuit comprises the following steps:

[0020] S1, A-phase secondary voltage measurement winding, B-phase secondary voltage measurement winding, C-phase secondary voltage measurement winding are first connected to the secondary voltage circuit breaker of the voltage transformer in the control cabinet through wires, and then connected to the Ua secondary voltage terminal, Ub secondary voltage terminal, and Uc secondary voltage terminal of the electric energy meter measurement junction box respectively, and then connected to the secondary voltage measurement terminal a, secondary voltage measurement terminal d, and secondary voltage measurement terminal g of the three-phase secondary voltage of the electric energy meter body after passing through the voltage connection piece in the electric energy meter measurement junction box;

[0021] The secondary measuring current Ia* output by the S2 and A-phase secondary measuring current windings passes through the secondary measuring current terminal S1 on the current transformer body, and is first connected to the A-phase secondary measuring current A411 of the secondary current terminal block in the control cabinet door through the secondary current wire, and then is connected to the incoming wiring terminal of the A-phase secondary measuring current inside the metering junction box through the wires in turn, and then passes through the L wiring terminal of the A-phase in the metering junction box of the meter, and then is connected to the wiring terminal b of the A-phase secondary measuring current coil of the element Ⅰ of the meter body through the secondary current wire, and the wiring terminal b is connected to the A-phase secondary measuring current coil of the element Ⅰ of the meter body through the A-phase secondary in the meter body. The measuring current coil is connected to the terminal c, which is connected to the secondary current terminal inside the electric energy meter measurement junction box through the secondary measuring current wire, and then connected to the A-phase secondary measuring current A412 of the secondary current terminal block in the control cabinet door through the secondary current wire through the A-phase secondary measuring current outlet terminal and the current connecting piece M and the current connecting piece N in the electric energy meter measurement junction box, and then connected to the A-phase secondary measuring current terminal S2 on the current transformer body through the secondary current wire, and finally connected to the secondary measuring current Ia of the A-phase secondary measuring current winding;

[0022] The secondary measuring current Ic* output by the S3 and C-phase secondary measuring current windings passes through the secondary measuring current terminal S1 on the current transformer body, and is firstly connected to the C-phase secondary measuring current C411 of the secondary current terminal block in the control cabinet door through the secondary current wire, and then is connected to the C-phase secondary measuring current incoming wiring terminal inside the electric energy meter measurement junction box through the wires in turn, and then passes through the C-phase L wiring terminal in the electric energy meter measurement junction box, and then is connected to the C-phase secondary measuring current coil wiring terminal e of the element II of the electric energy meter body through the secondary current wire, and the wiring terminal e is connected to the C-phase secondary measuring current coil wiring terminal e of the electric energy meter body through the C-phase secondary wiring terminal in the electric energy meter body. The measuring current coil is connected to the terminal f, which is connected to the secondary current terminal inside the electric energy meter measurement junction box through the secondary measuring current wire, and then connected to the C-phase secondary measuring current C412 of the secondary current terminal block in the control cabinet door through the secondary current wire, and finally connected to the C-phase secondary measuring current terminal S2 on the current transformer body through the secondary current wire, and finally connected to the secondary measuring current Ic of the C-phase secondary measuring current winding;

[0023] S4, the A-phase secondary measuring current A412 of the current transformer and the C-phase secondary measuring current C412 of the current transformer are reliably connected to the secondary current grounding wire N412 after being short-circuited by a special current shorting metal sheet at the secondary current terminal block of the control cabinet door.

[0024] The present invention has the following beneficial effects:

[0025] The three-phase two-element electric energy meter measurement wiring circuit and working method designed in the present invention do not need to shut down the high-voltage equipment or use special short-circuit wires on the current terminal block to short-circuit the secondary current and perform grounding treatment when the electric energy meter needs to be replaced. It only needs to disconnect the three voltage connecting pieces in the electric energy meter measurement wiring box, and short-circuit the two current connecting pieces of the A and C phases respectively to short-circuit the secondary inlet and outlet measurement current of the A phase and the secondary inlet and outlet measurement current of the C phase; the electric energy meter can be replaced, which has the advantages of simple operation, high efficiency, safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The utility model discloses a measurement wiring circuit diagram of a three-phase two-element electric energy meter in the prior art.

[0027] Figure 2 The invention discloses a three-phase two-element electric energy meter measurement wiring circuit diagram.

[0028] In the figure: 1-electricity meter body, 1.1-A phase secondary current measurement coil, 1.2-C phase secondary current measurement coil, 1.3-A phase secondary voltage measurement coil, 1.4-B phase secondary voltage measurement coil, 1.5-C phase secondary voltage measurement coil;

[0029] 2-Energy meter measurement junction box, 2.1-voltage connection piece, 2.2-current connection piece;

[0030] 3-Secondary voltage measuring winding of voltage transformer, 3.1-Secondary voltage measuring winding of phase A, 3.2-Secondary voltage measuring winding of phase B, 3.3-Secondary voltage measuring winding of phase C, 3.4-Secondary voltage circuit breaker;

[0031] 4-Current transformer secondary measurement current winding, 4.1-A phase secondary measurement current winding, 4.2-C phase secondary measurement current winding. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely further describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] like Figure 2As shown, a three-phase two-element electric energy meter measurement wiring circuit includes an electric energy meter body 1, an electric energy meter measurement junction box 2, a voltage transformer secondary measurement voltage winding 3 and a current transformer secondary measurement current winding 4. The electric energy meter body 1 includes element I and element II as well as secondary voltage terminals and secondary current terminals. Element I includes an A-phase secondary measurement current coil 1.1, an A-phase secondary measurement voltage coil 1.3 and a B-phase secondary measurement voltage coil 1.4. Element II includes a C-phase secondary measurement current coil 1.2, a B-phase secondary measurement voltage coil 1.4 and a C-phase secondary measurement voltage coil 1.5.

[0034] The electric energy meter measurement junction box 2 is provided with Ua secondary voltage terminal, Ub secondary voltage terminal, Uc secondary voltage terminal, A phase secondary current terminal, C phase secondary current terminal, three voltage connecting pieces 2.1 and four current connecting pieces 2.2. The secondary voltage of the voltage transformer secondary measurement voltage winding 3 is connected to the secondary measurement voltage terminal of the electric energy meter body 1 through the voltage connecting piece 2.1 of the electric energy meter measurement junction box 2, and the secondary current of the current transformer secondary measurement current winding 4 is connected to the secondary measurement current terminal of the electric energy meter body 1 through the current connecting piece 2.2 of the electric energy meter measurement junction box 2.

[0035] The connection terminals on one side of the energy meter measurement junction box 2 are connected to the connection terminals of the energy meter body 1 , and the connection terminals on the other side of the energy meter measurement junction box 2 are connected to the secondary voltage measurement winding 3 of the voltage transformer and the secondary current measurement winding 4 of the current transformer.

[0036] The voltage transformer secondary measuring voltage winding 3 comprises an A-phase secondary measuring voltage winding 3.1, a B-phase secondary measuring voltage winding 3.2, a C-phase secondary measuring voltage winding 3.3 and a secondary side voltage breaker 3.4. The secondary side voltage breaker 3.4 controls the on and off of the three-phase secondary voltage of the voltage transformer.

[0037] The A-phase secondary measuring voltage winding 3.1 is connected to the Ua secondary voltage terminal of the electric energy meter measurement junction box 2 through a wire via the secondary side voltage circuit breaker 3.4; the B-phase secondary measuring voltage winding 3.2 is connected to the Ub secondary voltage terminal of the electric energy meter measurement junction box 2 through a wire via the secondary side voltage circuit breaker 3.4; the C-phase secondary measuring voltage winding 3.3 is connected to the Uc secondary voltage terminal of the electric energy meter measurement junction box 2 through a wire via the secondary side voltage circuit breaker 3.4.

[0038] The current transformer secondary measuring current winding 4 includes an A-phase secondary measuring current winding 4.1 and a C-phase secondary measuring current winding 4.2. The A-phase secondary measuring current winding 4.1 is connected to the A-phase secondary current terminal on the electric energy meter measurement junction box 2 through a wire; the C-phase secondary measuring current winding 4.2 is connected to the C-phase secondary current terminal on the electric energy meter measurement junction box 2 through a wire.

[0039] The wire used for connecting the secondary voltage transformer winding 3 to the energy meter junction box 2 is 1.5mm in cross section. 2 Single strand copper core wire.

[0040] The wire used for connecting the secondary current transformer winding 4 to the energy meter junction box 2 is 2.5mm in cross section. 2 Single strand copper core wire.

[0041] A working method of a three-phase two-element electric energy meter measurement wiring circuit comprises the following steps:

[0042] 1. The A-phase secondary voltage measurement winding, the B-phase secondary voltage measurement winding, and the C-phase secondary voltage measurement winding are first connected to the secondary side voltage circuit breaker of the voltage transformer in the control cabinet through wires, and then connected to the Ua secondary voltage terminal, Ub secondary voltage terminal, and Uc secondary voltage terminal of the electric energy meter measurement junction box respectively. After passing through the voltage connecting piece in the electric energy meter measurement junction box, they are connected to the secondary voltage measurement terminal a, secondary voltage measurement terminal d, and secondary voltage measurement terminal g of the three-phase secondary voltage of the electric energy meter body respectively.

[0043] 2. The secondary measuring current Ia* output by the A-phase secondary measuring current winding passes through the secondary measuring current terminal S1 on the current transformer body, and is first connected to the A-phase secondary measuring current A411 of the secondary current terminal block in the control cabinet door through the secondary current wire, and then connected to the A-phase secondary measuring current incoming wiring terminal inside the electric energy meter measurement junction box through the wire, and then through the A-phase L wiring terminal in the electric energy meter measurement junction box, and then connected to the A-phase secondary measuring current coil wiring terminal b of the element Ⅰ of the electric energy meter body through the secondary current wire. The wiring terminal b is connected to the A-phase secondary measuring current coil wiring terminal b of the electric energy meter body through the A-phase secondary measuring current terminal in the electric energy meter body. The measuring current coil is connected to the terminal c, and the terminal c is connected to the secondary current terminal inside the electric energy meter measurement junction box through the secondary measuring current wire, and then through the M terminal and current connecting piece M and current connecting piece N of the A phase in the electric energy meter measurement junction box, through the secondary measuring current outlet terminal of the A phase, and connected to the A phase secondary measuring current A412 of the secondary current terminal block in the control cabinet door through the secondary current wire, and then connected to the A phase secondary measuring current terminal S2 on the current transformer body through the secondary current wire, and finally connected to the secondary measuring current Ia of the A phase secondary measuring current winding.

[0044] 3. The secondary measuring current Ic* output by the C-phase secondary measuring current winding passes through the secondary measuring current terminal S1 on the current transformer body, and is first connected to the C-phase secondary measuring current C411 of the secondary current terminal block in the control cabinet door through the secondary current wire, and then is connected to the C-phase secondary measuring current incoming wiring terminal inside the electric energy meter measurement junction box through the wire, and then passes through the C-phase L wiring terminal in the electric energy meter measurement junction box, and is connected to the C-phase secondary measuring current coil wiring terminal e of the element II of the electric energy meter body through the secondary current wire. The wiring terminal e is connected to the C-phase secondary measuring current coil wiring terminal e of the electric energy meter body through the C-phase secondary measuring current terminal S1 on the current transformer body, and the ... The current measuring coil is connected to the terminal f, and the terminal f is connected to the secondary current terminal inside the electric energy meter measurement junction box through the secondary measuring current wire, and then through the M terminal of the C phase and the current connecting piece M and the current connecting piece N in the electric energy meter measurement junction box, through the secondary measuring current outlet terminal of the C phase, and through the secondary current wire to the C phase secondary measuring current C412 of the secondary current terminal block in the control cabinet door, and then through the secondary current wire to the C phase secondary measuring current terminal S2 on the current transformer body, and finally connected to the secondary measuring current Ic of the C phase secondary measuring current winding.

[0045] 4. The A-phase secondary measuring current A412 of the current transformer and the C-phase secondary measuring current C412 of the current transformer are short-circuited at the secondary current terminal block of the control cabinet door through a special current short-circuiting metal sheet and then reliably connected to the secondary current grounding wire N412.

[0046] The present invention provides a three-phase two-element electric energy meter measurement wiring circuit. When the electric energy meter needs to be replaced, it is not necessary to shut down the high-voltage equipment, or use a special short-circuit wire on the current terminal block to short-circuit the secondary current and ground it, etc. It is only necessary to disconnect the three voltage connection pieces 2.1 in the electric energy meter measurement wiring box 2, and short-circuit the two current connection pieces 2.2 of the A and C phases respectively. The electric energy meter can be replaced. It has the advantages of simple operation, high efficiency, safety and reliability.

[0047] The present invention is not limited to the above-mentioned implementation modes, and anyone should be aware of the structural changes made under the enlightenment of the present invention, and all those having the same or similar technical solutions as the present invention fall within the protection scope of the present invention.

[0048] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A three-phase two-element electric energy meter measurement wiring circuit, characterized in that: It includes an electric energy meter body and an electric energy meter measurement junction box, wherein the electric energy meter body includes element I and element II, element I includes an A-phase secondary measurement current coil, an A-phase secondary measurement voltage coil and a B-phase secondary measurement voltage coil, element II includes a C-phase secondary measurement current coil, a B-phase secondary measurement voltage coil and a C-phase secondary measurement voltage coil, and the electric energy meter measurement junction box is provided with a voltage connecting piece and a current connecting piece, a connection terminal on one side of the electric energy meter measurement junction box is connected to a connection terminal of the electric energy meter body, and a connection terminal on the other side of the electric energy meter measurement junction box is connected to a voltage transformer secondary measurement voltage winding and a current transformer secondary measurement current winding.

2. The three-phase two-element electric energy meter measurement wiring circuit according to claim 1 is characterized in that: The voltage transformer secondary measurement voltage winding comprises an A-phase secondary measurement voltage winding, a B-phase secondary measurement voltage winding, a C-phase secondary measurement voltage winding and a secondary side voltage circuit breaker, and the secondary side voltage circuit breaker controls the on and off of the three-phase secondary voltage of the voltage transformer.

3. The three-phase two-element electric energy meter measurement wiring circuit according to claim 2 is characterized in that: The A-phase secondary voltage measurement winding is connected to the Ua secondary voltage terminal of the energy meter measurement junction box through a secondary voltage circuit breaker via a wire; The B-phase secondary voltage measurement winding is connected to the Ub secondary voltage terminal of the energy meter measurement junction box through a secondary voltage circuit breaker via a wire; The C-phase secondary measurement voltage winding is connected to the Uc secondary voltage terminal of the electric energy meter measurement junction box through a wire via a secondary side voltage circuit breaker.

4. The three-phase two-element electric energy meter measurement wiring circuit according to claim 1, characterized in that: The secondary current measuring winding of the current transformer includes an A-phase secondary current measuring winding and a C-phase secondary current measuring winding. The A-phase secondary current measuring winding is connected to the A-phase secondary current terminal on the electric energy meter measurement junction box through a wire; the C-phase secondary current measuring winding is connected to the C-phase secondary current terminal on the electric energy meter measurement junction box through a wire.

5. The three-phase two-element electric energy meter measurement wiring circuit according to claim 1, characterized in that: The electric energy meter measurement junction box is provided with three voltage connection pieces and four current connection pieces. The voltage of the secondary voltage measurement winding of the voltage transformer is connected to the secondary voltage measurement terminal of the electric energy meter body through the voltage connection piece of the electric energy meter measurement junction box, and the current of the secondary current measurement winding of the current transformer is connected to the secondary current measurement terminal of the electric energy meter body through the current connection piece of the electric energy meter measurement junction box.

6. The three-phase two-element electric energy meter measurement wiring circuit according to claim 1, characterized in that: The wire used to connect the secondary voltage transformer winding to the energy meter junction box is 1.5mm in cross section. 2 Single strand copper core wire.

7. The three-phase two-element electric energy meter measurement wiring circuit according to claim 1, characterized in that: The wire used to connect the secondary current transformer winding to the energy meter junction box is 2.5mm in cross section. 2 Single strand copper core wire.

8. The working method of the three-phase two-element electric energy meter measurement wiring circuit according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, A-phase secondary voltage measurement winding, B-phase secondary voltage measurement winding, C-phase secondary voltage measurement winding are first connected to the secondary voltage circuit breaker of the voltage transformer in the control cabinet through wires, and then connected to the Ua secondary voltage terminal, Ub secondary voltage terminal, and Uc secondary voltage terminal of the electric energy meter measurement junction box respectively, and then connected to the secondary voltage measurement terminal a, secondary voltage measurement terminal d, and secondary voltage measurement terminal g of the three-phase secondary voltage of the electric energy meter body after passing through the voltage connection piece in the electric energy meter measurement junction box; The secondary measuring current Ia* output by the S2 and A-phase secondary measuring current windings passes through the secondary measuring current terminal S1 on the current transformer body, and is first connected to the A-phase secondary measuring current A411 of the secondary current terminal block in the control cabinet door through the secondary current wire, and then is connected to the incoming wiring terminal of the A-phase secondary measuring current inside the metering junction box through the wires in turn, and then passes through the L wiring terminal of the A-phase in the metering junction box of the meter, and then is connected to the wiring terminal b of the A-phase secondary measuring current coil of the element Ⅰ of the meter body through the secondary current wire, and the wiring terminal b is connected to the A-phase secondary measuring current coil of the element Ⅰ of the meter body through the A-phase secondary in the meter body. The measuring current coil is connected to the terminal c, which is connected to the secondary current terminal inside the electric energy meter measurement junction box through the secondary measuring current wire, and then connected to the A-phase secondary measuring current A412 of the secondary current terminal block in the control cabinet door through the secondary current wire through the A-phase secondary measuring current outlet terminal and the current connecting piece M and the current connecting piece N in the electric energy meter measurement junction box, and then connected to the A-phase secondary measuring current terminal S2 on the current transformer body through the secondary current wire, and finally connected to the secondary measuring current Ia of the A-phase secondary measuring current winding; The secondary measuring current Ic* output by the S3 and C-phase secondary measuring current windings passes through the secondary measuring current terminal S1 on the current transformer body, and is firstly connected to the C-phase secondary measuring current C411 of the secondary current terminal block in the control cabinet door through the secondary current wire, and then is connected to the C-phase secondary measuring current incoming wiring terminal inside the electric energy meter measurement junction box through the wires in turn, and then passes through the C-phase L wiring terminal in the electric energy meter measurement junction box, and then is connected to the C-phase secondary measuring current coil wiring terminal e of the element II of the electric energy meter body through the secondary current wire, and the wiring terminal e is connected to the C-phase secondary measuring current coil wiring terminal e of the electric energy meter body through the C-phase secondary wiring terminal in the electric energy meter body. The measuring current coil is connected to the terminal f, which is connected to the secondary current terminal inside the electric energy meter measurement junction box through the secondary measuring current wire, and then connected to the C-phase secondary measuring current C412 of the secondary current terminal block in the control cabinet door through the secondary current wire, and finally connected to the C-phase secondary measuring current terminal S2 on the current transformer body through the secondary current wire, and finally connected to the secondary measuring current Ic of the C-phase secondary measuring current winding; S4, the A-phase secondary measuring current A412 of the current transformer and the C-phase secondary measuring current C412 of the current transformer are reliably connected to the secondary current grounding wire N412 after being short-circuited by a special current shorting metal sheet at the secondary current terminal block of the control cabinet door.

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