Current sampling plate device convenient for maintenance of electric energy quality product

Abstract

The utility model relates to the field of electric energy quality product sampling, in particular to a current sampling plate device convenient for maintenance of electric energy quality products, which comprises a system current transformer and a plurality of current sampling plates. A port S1 and a port S2 of a system current transformer are connected with ports P1 and ports P2 of Hall current sensors of a plurality of current sampling plates in series, the current sampling plates are connected with an electric energy quality module through wiring terminals, ports G1, in the current sampling plates, of the Hall current sensors are connected with one end of a resistor, ports I of the wiring terminals, ports II of the resistors, ports III of the wiring terminals, and ports IV of the resistors. And a port 2 of the Hall current sensor is connected with the other end of the resistor and is connected with an AGND port of the power quality module through a wiring terminal. Compared with the prior art, the Hall current sensors in the current sampling plate are connected in series, so that when one electric energy quality module is pulled out for maintenance, a current sampling loop cannot be disconnected, and other modules can continue to work normally.

Description

Technical Field

[0001] The utility model relates to the field of sampling of power quality products, and specifically relates to a current sampling board device convenient for the maintenance of power quality products. Background Technique

[0002] In existing power quality products, such as SVG reactive power compensation devices and APF active power filters, the whole device is composed of multiple modules in parallel; the current sampling circuit of the device is composed of multiple modules in series. When a fault occurs in one of the modules, during maintenance, since the current circuit cannot be opened, it is necessary to short-circuit the current circuit at the terminal, resulting in the problem that the maintenance of one module affects the operation of multiple modules. Summary of the Invention

[0003] The utility model aims to overcome the deficiencies of the prior art and provides a current sampling board device convenient for the maintenance of power quality products.

[0004] To achieve the above object, a current sampling board device convenient for the maintenance of power quality products is designed, including a system current transformer and multiple current sampling boards. The current sampling boards are equipped with Hall current sensors. The S1 port and S2 port of the system current transformer are connected in series with the P1 port and P2 port of the Hall current sensors of the multiple current sampling boards. The current sampling boards are connected to the power quality module through wiring terminals. The G1 port of the Hall current sensor in the current sampling board is connected to one end of a resistor and the I port of the wiring terminal, and the 2 port of the Hall current sensor is connected to the other end of the resistor and then connected to the AGND port of the power quality module through the wiring terminal.

[0005] The model of the Hall current sensor is TA0913-2M.

[0006] The G1 port of the Hall current sensor is also connected to the positive pole of a first voltage stabilizing diode, and the 2 port of the Hall current sensor is also connected to the positive pole of a second voltage stabilizing diode. The negative pole of the first voltage stabilizing diode is connected to the negative pole of the second voltage stabilizing diode.

[0007] The models of the first voltage stabilizing diode and the second voltage stabilizing diode are MM1Z3B3, and the voltage stabilizing value is 3.3V.

[0008] The resistance value of the resistor is 560Ω.

[0009] The power quality module is a reactive power compensation device or an active power filter.

[0010] The S2 port of the system current transformer is connected to the ground connection point.

[0011] Compared with the prior art, in the present utility model, Hall current sensors in the current sampling board are connected in series with each other. When one of the power quality modules is pulled out for maintenance, the current sampling circuit will not be disconnected, and other modules can continue to work normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is the circuit diagram of the present utility model.

[0013] See Figure 1 , where a is the current sampling board, b is the terminal block, c is the power quality module, CT1B is the system current transformer, CT is the Hall current sensor, R is the resistor, WD1 is the first voltage regulator diode, and WD2 is the second voltage regulator diode. SPECIFIC EMBODIMENTS

[0014] The following further describes the present utility model according to the drawings.

[0015] As Figure 1 shown, a system current transformer CT1B and multiple current sampling boards a are provided. The current sampling board a is provided with a Hall current sensor CT. The S1 port and S2 port of the system current transformer CT1B are connected in series with the P1 port and P2 port of the Hall current sensors CT of the multiple current sampling boards a. The current sampling board a is connected to the power quality module c through the terminal block b. The G1 port of the Hall current sensor CT in the current sampling board a is connected to one end of the resistor R and the I port of the terminal block b, and the 2 port of the Hall current sensor CT is connected to the other end of the resistor R and is connected to the AGND port of the power quality module c through the terminal block b.

[0016] The model of the Hall current sensor CT is TA0913-2M.

[0017] The G1 port of the Hall current sensor CT is also connected to the positive pole of the first voltage regulator diode WD1, and the 2 port of the Hall current sensor CT is also connected to the positive pole of the second voltage regulator diode WD2. The negative pole of the first voltage regulator diode WD1 is connected to the negative pole of the second voltage regulator diode WD2.

[0018] The models of the first voltage regulator diode WD1 and the second voltage regulator diode WD2 are MM1Z3B3, and the regulated voltage value is 3.3V.

[0019] The resistance value of the resistor R is 560Ω.

[0020] The power quality module c is a reactive power compensation device or an active power filter.

[0021] The S2 port of the system current transformer CT1B is connected to the ground connection point.

[0022] When the utility model is in use, the S1 port and S2 port of the system current transformer CT1B are connected in series with the P1 port and P2 port of the Hall current sensor in each current sampling board a. Specifically, the wire led out from the S1 port of the system current transformer CT1B first passes through the P1 port of the Hall current sensor CT and then through the P2 port, and after passing through the P1 and P2 ports of the Hall current sensor CT of each current sampling board a, the wire is connected to the S2 port of the system current transformer. When one or more power quality modules c are pulled out for maintenance, the secondary current loop between the G1 port and the 2 port of the Hall current sensor CT still forms a path through the resistor R, and the loop in which the system sampling current is connected in series will not be disconnected, and the remaining modules can continue to work normally.

[0023] The system current transformer CT1B outputs a current signal of 0 - 5A for the system current through electromagnetic induction. The Hall current sensor CT converts the signal output by the system current transformer CT1B into a current signal of 0 - 2.5mA. The resistance value of the resistor R is 560Ω, which can convert the current signal into a voltage signal of 0 - 1.4V to provide a sampling current for the power quality module c. The power quality module c can be a device such as an SVG reactive power compensation device or an APF active power filter. The wiring terminal b can adopt a plug-in wiring terminal, which is convenient for the quick connection and disconnection between the current sampling board a and the power quality module c.

[0024] The voltage stabilizing diode WD1 and the voltage stabilizing diode WD2 are arranged oppositely, and the voltage stabilizing value is 3.3V. If the output voltage value after the secondary side output current of the Hall current sensor CT is converted by the resistor R is greater than 3.3V, one of the voltage stabilizing diode WD1 or the voltage stabilizing diode WD2 will be reversely broken down, forming a short circuit inside the current sampling board a to prevent overvoltage from damaging the electrical components in the subsequent circuit.

[0025] Grounding the S2 port of the system power transformer can prevent the high voltage generated when the secondary side is open from breaking down the equipment insulation and endangering personal safety; it can also prevent the high voltage of the system current transformer CT1B from intruding into the series loop of the Hall current sensor CT and subsequent equipment when the insulation of the high voltage side is damaged, burning out the equipment.

Claims

1. A current sampling board device that facilitates the maintenance of power quality products, characterized by: The invention comprises a system current transformer (CT1B) and multiple current sampling boards (a). The current sampling board (a) is provided with a Hall current sensor (CT). The S1 port and the S2 port of the system current transformer (CT1B) are connected in series with the P1 port and the P2 port of the Hall current sensors (CT) of the multiple current sampling boards (a). The current sampling board (a) is connected to a power quality module (c) through a wiring terminal (b). The G1 port of the Hall current sensor (CT) in the current sampling board (a) is connected to one end of a resistor (R) and the I port of the wiring terminal (b). The 2 port of the Hall current sensor (CT) is connected to the other end of the resistor (R) and is connected to the AGND port of the power quality module (c) through the wiring terminal (b).

2. The current sampling board device for facilitating maintenance of power quality products according to claim 1, characterized in that: The model of the Hall current sensor (CT) is TA0913-2M.

3. The current sampling board device for facilitating maintenance of power quality products according to claim 1, characterized in that: The G1 port of the Hall current sensor (CT) is also connected to the positive electrode of the voltage regulator tube 1 (WD1), the 2 port of the Hall current sensor (CT) is also connected to the positive electrode of the voltage regulator tube 2 (WD2), and the negative electrode of the voltage regulator tube 1 (WD1) is connected to the negative electrode of the voltage regulator tube 2 (WD2).

4. The current sampling board device for facilitating maintenance of power quality products according to claim 3 is characterized in that: The models of the voltage regulator diode 1 (WD1) and the voltage regulator diode 2 (WD2) are MM1Z3B3, and the voltage regulation value is 3.3V.

5. The current sampling board device for facilitating maintenance of power quality products according to claim 1, characterized in that: The resistance value of the resistor (R) is 560Ω.

6. The current sampling board device for facilitating maintenance of power quality products according to claim 1, characterized in that: The power quality module (c) is a reactive power compensation device or an active power filter.

7. The current sampling board device for facilitating maintenance of power quality products according to claim 1, characterized in that: The S2 port of the system current transformer (CT1B) is connected to the grounding point.

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