CN108548947A - A kind of guillotine type electric energy metering combined wiring box - Google Patents

Abstract

The present invention relates to a kind of guillotine type electric energy metering combined wiring boxes, including box body, the box body is equipped with multiple and different terminals, respectively with mains side voltage, mains side electric current, voltage transformer and current transformer connect, the guillotine type electric energy metering combined wiring box further includes break-make link block and knife switch, the first end of the knife switch is fixed on tray interior by break-make link block, the second end of the knife switch is rotated around first end, knife switch rotate to it is coplanar with box body when, break-make link block is connected, guillotine type electric energy metering combined wiring box is in running order, knife switch rotate to it is vertical with box body when, break-make link block disconnects, guillotine type electric energy metering combined wiring box is off.Compared with prior art, the present invention has many advantages, such as to be less likely to occur wiring errors, easily operated and maintenance and highly practical.

Description

A combined junction box for switch knife electric energy metering

technical field

The invention relates to the field of electric energy metering devices, in particular to a switch knife type combined junction box for electric energy metering.

Background technique

The combined junction box for electric energy measurement is also the test terminal referred to in the inspection regulations for electric energy metering devices. The combined junction box for electric energy measurement can reduce the number of TA (current transformer) and TV (voltage transformer), which is convenient for live calibration of measuring instruments, and The connected instrument can be exchanged under electrified condition without affecting the normal operation of other instruments. The joint junction box plays a pivotal role in the electrical measurement circuit, and can effectively prevent wiring errors and improve measurement accuracy. It has multiple functions and has been widely used.

With the popularization and use of junction boxes for electric energy metering, more and more problems have been exposed in the installation and use of junction boxes. In the paper "Brief Introduction to the Correct Use of Electric Energy Metering Joint Junction Box", it is clarified that the existing electric energy metering joint junction box mainly realizes the switching between the working and disconnecting states of the junction box by connecting and disconnecting different terminals. Such a combined electrical energy metering junction box is extremely easy to be misunderstood when connecting, and there are too many contacts inside such a junction box. Not only are there many operating procedures, but also the installation process quality is difficult to control. poor.

In addition, the current joint junction box for electric energy measurement is generally made of black opaque material. The joint junction box for electric energy measurement realized in this way is likely to affect the fault judgment and the detection of electricity theft and leakage.

Contents of the invention

The object of the present invention is to provide a switch knife type combined junction box for electric energy metering to solve the above problems.

The purpose of the present invention can be achieved through the following technical solutions:

A combined junction box for switchblade electric energy metering, comprising a box body, on which a plurality of different terminals are arranged, respectively connected to the voltage on the power supply side, the current on the power supply side, a voltage transformer and a current transformer, the The knife-type electric energy metering combined junction box also includes an on-off connection module and a knife switch. The first end of the knife switch is fixed inside the box body through the on-off connection module, and the second end of the knife switch is wound around the second end of the knife switch. One end rotates, when the knife switch is rotated to be coplanar with the box body, the on-off connection module is turned on, the knife-type electric energy metering junction box is in working state, and when the knife switch is rotated to be perpendicular to the box body, the on-off connection module The connection module is disconnected, and the combined junction box of the knife-type electric energy meter is disconnected.

Preferably, the on-off connection module includes an A-phase on-off connection assembly, a B-phase on-off connection assembly, a C-phase on-off connection assembly, and a neutral phase on-off connection assembly, all of which are connected to the knife switch. The A-phase on-off connection assembly, The B-phase on-off connection assembly and the C-phase on-off connection assembly have the same structure.

Preferably, the A-phase on-off connection assembly includes an A-phase voltage sensor conduction unit and an A-phase current sensor conduction unit, and the A-phase voltage sensor conduction unit and the A-phase current sensor conduction unit are both connected to the knife switch .

Preferably, the conduction unit of the A-phase voltage sensor includes a first terminal and a second terminal that are not connected to each other, and the first terminal is connected to the terminal of the A-phase voltage transformer of the box body, so The second terminal is connected to the terminal of the A-phase power supply side voltage of the box body, the first end of the knife switch is fixed inside the box body through the second terminal, and the first terminal and the second terminal When the knife switch is rotated to be coplanar with the box body, they are mutually conducted through the knife switch.

Preferably, the conduction unit of the A-phase current sensor includes a third terminal and a fourth terminal that are not connected to each other, and the third terminal is connected to the terminal of the first A-phase current transformer of the box body , the fourth terminal is connected to the terminal of the first A-phase power supply side current of the box body, the first end of the knife switch is fixed inside the box body through the fourth terminal, and the third terminal and The fourth terminal is connected to each other through the knife switch when the knife switch is rotated to be coplanar with the box body.

Preferably, the conduction unit of the A-phase current sensor further includes a fixed metal rod, and the fixed metal rod communicates with the terminal of the second A-phase power supply side current of the box body. When the knife switch is rotated so that the box body is vertical , the terminal of the current on the power side of the first phase A is connected to the terminal of the current on the power side of the second phase A through the knife switch and the fixed metal rod in turn.

Preferably, the knife switch includes an insulating handle, an insulating connecting rod and a conduction knife head connected in sequence, the first end of the conduction knife head is fixed inside the box body through an on-off connection module, and the conduction knife head is fixed inside the box body through an on-off connection module. The second end of the opening knife head is connected to the insulating connecting rod, and the conducting knife head is driven by the insulating connecting rod to rotate around the on-off connection module with the insulating handle. When the insulating handle rotates to the same plane as the box body, The on-off connection module is turned on, and when the insulating handle is rotated to be perpendicular to the box body, the on-off connection module is disconnected.

Preferably, the on-off connection module includes a plurality of metal screws fixed inside the box body.

Preferably, the on-off connection module is provided with a concave surface for interlocking with the knife switch.

Preferably, the box includes a transparent box.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The present invention cooperates with the on-off connection module through the rotatable knife switch to realize the switching of the working state of the electric energy metering combined junction box, compared with the switching of the working state by replacing the terminal in the existing method , this switching method is very simple, and it is not easy to miswire the terminals. At the same time, this method can greatly simplify the number of terminals on the box body and the number of conduction points in the box body, thereby simplifying the process and improving the quality of the installation process. , the practicability is greatly enhanced, and it is suitable for mass production and use.

(2) The on-off connection module includes four parts: phase A, phase B, phase C and neutral phase, so that the on-off of the electric energy metering joint junction box can be realized uniformly under the rotation of the knife switch, which is simple and safe , Strong practicability.

(3) The A-phase on-off connection component includes the A-phase voltage sensor conduction unit and the A-phase current sensor conduction unit, which respectively realize the conduction of the voltage transformer and the conduction of the current transformer, which is convenient to implement and low in hardware cost, further enhancing Availability of energy metering junction boxes.

(4) The two terminals in each component are directly disconnected, and one terminal is used to fix one end of the knife switch, and the connection occurs when the knife switch rotates to the same plane. The switching of this state is simple and safe High reliability, not easy to break down.

(5) The conduction unit of the current sensor also includes a fixed metal rod, through which the terminals of the two power supply side currents are short-circuited and cut off when there is no conduction, so as to ensure the safety of the junction box and high safety performance.

(6) In addition to turning on the knife head, the knife switch also includes an insulating handle and an insulating connecting rod connected to it, which ensures the safety performance during operation.

(7) The on-off connection module is realized by metal screws fixed inside the box body, which has low cost and good conduction effect, thereby improving the cost performance of the entire electric energy metering combined junction box.

(8) The on-off connection module is provided with a concave surface for engaging with the knife switch, which can ensure the stability of the connection between the terminal post and the knife switch, and avoid the failure of the electric energy metering joint junction box caused by the ineffective connection of the two.

(9) The box body adopts a transparent box body, which is convenient for fault observation and maintenance, and improves the practicability of the device.

Description of drawings

Fig. 1 is a three-dimensional schematic diagram of a knife-type electric energy metering combined junction box in a conducting state;

Fig. 2 is a schematic plan view of the switch-knife electric energy metering joint junction box in the conduction state;

Fig. 3 is a three-dimensional schematic diagram of the switch-knife electric energy metering joint junction box in the disconnected state;

Fig. 4 is a schematic plan view of the knife-type electric energy metering combined junction box in the disconnected state;

Among them, 1 is a knife switch, 2 is a terminal, and 3 is a fixed metal rod.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

This embodiment provides a combined junction box for switch knife type electric energy metering, which includes a box body, on which a plurality of different terminals are provided, respectively connected to the voltage on the power supply side, the current on the power supply side, the voltage transformer and the current transformer Connection, the combined junction box of the knife-type electric energy metering also includes an on-off connection module and a knife switch 1, the first end of the knife switch 1 is fixed inside the box body through the on-off connection module, and the second end of the knife switch 1 is wound When the first end rotates, when the knife switch 1 is rotated to be coplanar with the box body, the on-off connection module is turned on, and the knife-type electric energy metering combined junction box is in a working state. When the knife switch 1 is rotated to be perpendicular to the box body , the on-off connection module is disconnected, and the combined junction box of the knife-type electric energy metering is in the disconnected state.

Among them, the on-off connection module includes A-phase on-off connection components, B-phase on-off connection components, C-phase on-off connection components, and neutral phase on-off connection components, which are all connected to the knife switch 1. The structure of the component and the C-phase on-off connection component are the same. The phase A on-off connection assembly includes a phase A voltage sensor conduction unit and a phase A current sensor conduction unit, both of which are connected to the knife switch 1 . The conduction unit of the A-phase voltage sensor includes a first terminal and a second terminal that are not connected to each other. The first terminal is connected to the terminal of the A-phase voltage transformer of the box body, and the second terminal is connected to the terminal of the box body. The terminal of the voltage on the power supply side of phase A is connected. The first terminal of the knife switch 1 is fixed inside the box body through the second terminal. The first terminal and the second terminal are rotated to the same plane as the box body when the knife switch 1 , through the knife switch 1 mutual conduction. The conduction unit of the A-phase current sensor includes a third terminal and a fourth terminal that are not connected to each other. The third terminal is connected to the terminal of the first A-phase current transformer of the box body, and the fourth terminal is connected to the box. The terminal of the first phase A power supply side current of the body is connected, the first end of the knife switch 1 is fixed inside the box body through the fourth terminal, and the third terminal and the fourth terminal are rotated to the same position as the knife switch 1. When the boxes are on the same plane, they are connected to each other through the knife switch 1. The conduction unit of the A-phase current sensor also includes a fixed metal rod 3, and the fixed metal rod 3 communicates with the terminal of the second A-phase power supply side current of the box body. The terminal of the phase power supply side current is connected to the terminal of the second A phase power supply side current through the knife switch 1 and the fixed metal rod 3 in turn. The knife switch 1 includes an insulating handle, an insulating connecting rod and a conduction knife head connected in sequence, the first end of the conduction knife head is fixed inside the box body through the on-off connection module, and the second end of the conduction knife head Connected with the insulating connecting rod, the conduction switch head is driven by the insulating connecting rod and rotates around the on-off connection module with the insulating handle. When rotating to be perpendicular to the box body, disconnect the on-off connection module. The on-off connection module includes a plurality of metal screws fixed inside the box body. The on-off connection module is provided with a concave surface for engaging with the knife switch 1 . The box body includes a transparent box body.

The combined junction box for electric energy measurement realized according to the above structure is shown in Figures 1 to 4. It can be seen from the figure that the combined junction box is divided into four parts, which are connected to phase A, phase B, phase C and neutral phase respectively. Connection, the knife switch 1 is connected to the four parts. In this embodiment, the knife switch 1 is 217.5mm wide and is located on the uppermost layer of the whole device. In each part, the terminal 2 is used as the key node for on and off, and these key nodes are all connected to the knife switch 1 .

Take phase A as an example (phases B and C are similar): the two terminals B and D are the rotation centers of the knife switch 1, and control the on-off status of the two terminals A and C respectively. After the switch blade between the D terminals is disconnected from the C and D terminals, it will be used as a switch 1 to connect the D and E terminals.

The specific wiring method of the electric energy metering combined junction box in this embodiment is as follows: U1, V1, W1, N1 are respectively connected to the voltage three-phase and neutral line of the power supply side, and U2, V2, W2, N2 are respectively connected to the voltage transformer side; I1 , I2, I5, I6, I9, and I10 are respectively connected to the three-phase current on the power supply side, and I3, I4, I7, I8, I11, and I12 are respectively connected to the current transformer side.

The specific working mode of the junction box is as follows:

Taking phase A as an example, when working: terminal A and terminal B are connected through the conduction switch head, power supply side U1 is connected with voltage transformer terminal U2; terminal C and terminal D are also connected through conduction The switch blades are connected, and the current loop is "power supply side current I2 → terminal D → conduction switch blade → current transformer I4 → current transformer I3 → power supply side current I1", thus forming a complete current measurement circuit.

In the same way, V1, V2, W1, W2 on the power supply side and N1, N2 on the neutral line side are all connected, I5~I8 constitute the B-phase current transformer measurement circuit, I9~I12 constitute the C-phase current transformer measurement circuit, the specific connection status As shown in Figure 1 and Figure 2.

When not working, as shown in Fig. 3 and Fig. 4, the knife switch 1 rotates 90 degrees upwards, and the knife switch 1 drives seven conduction knife heads to move upward, and the knife switch 1 is perpendicular to the box body. At this time, the terminal A, B and A-phase voltage gate blades are disconnected, and the voltage transformer is disconnected to lose voltage; the terminal C, D and A-phase current gate blades are disconnected, and the current I2 on the power supply side is disconnected from the current transformer side I4 , the terminals E and D are connected through the horizontal fixed metal rod 3, and the current on the power supply side passes through "I1 terminal→terminal E→fixed metal rod 3→terminal D→I2 terminal", thus forming a short circuit and interception state of the power side current. Similarly, the B-phase voltages V1 and V2 on the power supply side, the C-phase voltages W1 and W2, and the neutral line side N1 and N2 are all disconnected and lose voltage, the B-phase power supply side currents I5 and I6 are in the state of short circuit and current cut-off, and the C-phase power supply side The currents I9 and I10 are also in the state of short-circuit and cut-off. Since the neutral phase is not connected to the current sensor, the neutral phase has no action at this time.

Claims (10)

1. A combined junction box for switchblade type electric energy metering, comprising a box body, the box body is provided with a plurality of different terminals, which are respectively connected to the power supply side voltage, the power supply side current, a voltage transformer and a current transformer, It is characterized in that the combined junction box of the switch knife type electric energy metering also includes an on-off connection module and a switch knife switch, the first end of the switch knife switch is fixed inside the box body through the on-off connection module, and the switch knife switch The second end of the switch rotates around the first end. When the knife switch rotates to the same plane as the box body, the on-off connection module conducts, and the combined junction box of the knife-type electric energy meter is in working state. When the knife switch rotates to the same plane as the box When the body is vertical, the on-off connection module is disconnected, and the combined junction box of the knife-type electric energy meter is in the disconnected state. 2. The combined junction box for knife-type electric energy metering according to claim 1, wherein the on-off connection module includes an A-phase on-off connection assembly, a B-phase on-off connection assembly, and a C-phase connection module all connected to the knife switch. The break connection assembly and the neutral phase on-off connection assembly, the A-phase on-off connection assembly, the B-phase on-off connection assembly and the C-phase on-off connection assembly have the same structure. 3. The combined junction box for knife-type electric energy metering according to claim 1, characterized in that, the phase A on-off connection assembly includes a phase A voltage sensor conduction unit and a phase A current sensor conduction unit, and the phase A Both the voltage sensor conduction unit and the A-phase current sensor conduction unit are connected to the knife switch. 4. The combined junction box for switch knife type electric energy metering according to claim 3, characterized in that, the conduction unit of the phase A voltage sensor includes a first terminal and a second terminal that are not connected to each other, and the The first terminal is connected to the terminal of the A-phase voltage transformer of the box body, the second terminal is connected to the terminal of the A-phase power supply side voltage of the box body, and the first terminal of the knife switch passes through the second The terminal is fixed inside the box body, and the first terminal and the second terminal are connected to each other through the knife switch when the knife switch is rotated to be coplanar with the box body. 5. The combined junction box for switch knife type electric energy metering according to claim 3, wherein the conduction unit of the A-phase current sensor includes a third terminal and a fourth terminal that are not connected to each other, and the The third terminal is connected to the terminal of the first A-phase current transformer of the box body, the fourth terminal is connected to the terminal of the first A-phase power supply side current of the box body, and the first terminal of the knife switch The terminal is fixed inside the box body through the fourth terminal, and the third terminal and the fourth terminal are connected to each other through the knife switch when the knife switch is rotated to be coplanar with the box body. 6. The combined junction box for switch knife type electric energy metering according to claim 5, wherein the conduction unit of the phase A current sensor further includes a fixed metal rod, and the fixed metal rod is connected to the second phase A of the box body. The terminals of the power side current are connected to each other. When the knife switch is rotated so that the box is vertical, the terminals of the first phase A power side current pass through the knife switch and the fixed metal rod and the terminals of the second A phase power side current in turn. connect. 7. The combined junction box of switch knife type electric energy metering according to claim 1, characterized in that, the switch knife switch includes an insulating handle, an insulating connecting rod and a conduction switch knife head connected in sequence, and the conduction switch knife The first end of the head is fixed inside the box body through the on-off connection module, the second end of the conduction knife head is connected with the insulating connecting rod, and the conducting knife head is driven by the insulating connecting rod with the insulating handle Rotate around the on-off connection module, when the insulating handle rotates to be coplanar with the box body, the on-off connection module is turned on, and when the insulating handle rotates to be perpendicular to the box body, the on-off connection module is disconnected. 8. The combined junction box for knife-type electric energy metering according to claim 1, wherein the on-off connection module includes a plurality of metal screws fixed inside the box body. 9. The combined junction box for switch knife type electric energy metering according to claim 1, characterized in that, the on-off connection module is provided with a concave surface for engaging with the switch knife switch. 10. The combined junction box for knife-type electrical energy metering according to claim 1, wherein the box body comprises a transparent box body.