CN207623395U - A kind of divider of ontology and second divided voltage plate Phototube Coupling - Google Patents

Abstract

The utility model discloses a DC voltage divider with photoelectric isolation between a body and a secondary voltage divider, comprising a high voltage arm connected to a DC high voltage line, a low voltage arm, a secondary voltage divider, and a secondary voltage divider for connecting the secondary voltage divider to the DC voltage divider. The isolating device, the remote module and the control protection screen for electrical isolation of the body; the low-voltage arm and the high-voltage arm are connected to form a voltage divider circuit; the secondary voltage divider board includes several circuits arranged in parallel, and each circuit includes a third capacitor and a second capacitor arranged in parallel. Three resistors; the remote module converts the voltage analog signal in the secondary voltage divider into an optical digital signal, and transmits it to the control protection screen. The DC voltage divider isolates the secondary voltage divider and the low-voltage arm through the isolation device. If the electrical components of a circuit in the secondary voltage divider fail, the transformation ratio of the DC voltage divider cannot be changed, and the secondary voltage divider will not be affected. The normal operation of other circuits improves the working stability of the DC voltage divider.

Description

A DC voltage divider with photoelectric isolation between the main body and the secondary voltage divider

technical field

The utility model relates to the technical field of DC voltage measurement, in particular to a DC voltage divider with photoelectric isolation between a main body and a secondary voltage dividing plate.

Background technique

In the DC transmission project, the DC voltage divider is one of the most important equipment for DC control protection and measurement of the voltage collected by the wave recording system. The DC voltage divider is mainly used in the measurement of the DC voltage of the DC pole busbar and the neutral busbar of the converter station, and provides accurate voltage signals for the control protection and fault recording system of the converter station. If a fault occurs, the measured voltage will be directly inaccurate. It may even lead to a blockage of the DC transmission system. Therefore, the normal operation of the DC voltage divider is directly related to the stable operation of the DC transmission system.

When the resistive electrical component of a circuit in the DC secondary voltage divider fails, the transformation ratio of the DC voltage divider is changed, which directly causes abnormalities in the measurement of other circuits on the DC secondary voltage divider. It can be seen that eliminating the influence of the fault of the secondary voltage divider on the resistance value of the low voltage side is of great significance for the safe and stable operation of the DC voltage divider and the converter station.

Utility model content

The purpose of the utility model is to overcome the shortcomings of the above-mentioned prior art and provide a DC voltage divider with photoelectric isolation between the main body and the secondary voltage divider. The DC voltage divider has good stability and high reliability.

The utility model is realized through the following technical solutions: a DC voltage divider with photoelectric isolation between the main body and the secondary voltage divider, which includes a high voltage arm, a low voltage arm, and a secondary voltage divider for connecting the secondary voltage divider with the DC The isolation device, the remote module and the control protection screen for the electrical isolation of the voltage divider body; the high-voltage arm is connected to the DC high-voltage line, and the low-voltage arm is connected to the high-voltage arm to form a voltage-dividing circuit; the isolation One end of the device is connected to the low-voltage arm, and the other end is connected to the secondary voltage divider; the secondary voltage divider includes several circuits arranged in parallel, and each circuit includes a third capacitor and a third resistor arranged in parallel The remote module is connected to the secondary voltage divider, and the remote module converts the voltage analog signal in the secondary voltage divider into an optical digital signal, and transmits it to the control protection screen.

The two ends of the isolation device are respectively connected to the low voltage arm and the secondary voltage divider, which realizes the electrical isolation of the secondary voltage divider from the DC voltage divider body; the secondary voltage divider realizes the secondary voltage division of the low voltage arm;

The high-voltage arm includes a first resistor and a first voltage-balancing capacitor, and the first resistor and the first voltage-balancing capacitor are connected in parallel between the DC high-voltage line and the low-voltage arm.

The low-voltage arm includes a second resistor, a second voltage equalizing capacitor and a lightning protection diode; the second resistor, the second voltage equalizing capacitor and the lightning protection diode are arranged in parallel, and one end of the parallel connection is in phase with the high voltage arm connected, and the other end is grounded.

The isolation device includes an electrical signal/optical signal conversion module and an optical signal/electrical signal conversion module, one end of the electrical signal/optical signal conversion module is connected to the low-voltage arm, and the other end is connected to the optical signal/electrical signal The conversion module is connected, and the optical signal/electrical signal conversion module is connected with the secondary voltage divider.

Compared with the prior art, the utility model has the advantages that: the utility model takes the DC voltage divider as the object, and isolates the secondary voltage divider and the low-voltage arm through the isolation device, and the electrical components of a circuit in the secondary voltage divider The transformation ratio of the DC voltage divider cannot be changed in the event of a fault, which does not affect the normal operation of other circuits in the secondary voltage divider, and improves the working stability of the DC voltage divider; compared with the existing technology, this kind of body is isolated from the secondary voltage divider A DC voltage divider has clear advantages.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the utility model.

Meanings of reference signs in the figure: 1. High voltage arm; 2. Low voltage arm; 3. Isolation device; 4. Secondary voltage divider; 5. Remote module; 6. Control protection screen; 7. Electrical signal/optical signal conversion module ;8. Optical signal/electrical signal conversion module; R1, first resistor; C1, first equalizing capacitor; R2, second resistor; C2, second equalizing capacitor; R3, third resistor; C3, third capacitor ; F, lightning protection diode; ES electrical signal; OS, optical signal.

Detailed ways

The content of the present utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Example

Referring to Figure 1, it is a DC voltage divider with photoelectric isolation between the main body and the secondary voltage divider, which includes a high voltage arm 1, a low voltage arm 2, and a secondary voltage divider 4 for connecting the secondary voltage divider 4 and the DC voltage divider The isolation device 3, the remote module 5 and the control protection screen 6 for electrical isolation of the main body; the high-voltage arm 1 is connected to the DC high-voltage line, and the low-voltage arm 2 is connected to the high-voltage arm 1 to form a voltage dividing circuit; one end of the isolation device 3 is connected to the The low-voltage arm 2 is connected, and the other end thereof is connected to the secondary voltage divider 4; the secondary voltage divider 4 includes several circuits arranged in parallel, and each circuit includes a third capacitor C3 and a third resistor R3 arranged in parallel; the remote module 5 It is connected with the secondary voltage divider 4 , and the remote module 5 converts the voltage analog signal in the secondary voltage divider 4 into an optical digital signal, and transmits it to the control protection screen 6 .

The two ends of the isolation device 3 are electrically connected to the low-voltage arm 2 and the secondary voltage divider 4 respectively, realizing the electrical isolation of the secondary voltage divider 4 from the DC voltage divider body; Partial pressure;

The high-voltage arm 1 includes a first resistor R1 and a first equalizing capacitor C1, and the first resistor R1 and the first equalizing capacitor C1 are connected in parallel between the DC high-voltage line and the low-voltage arm 2 .

The low-voltage arm 2 includes a second resistor R2, a second voltage equalizing capacitor C2 and a lightning protection diode F; the second resistor R2, the second voltage equalizing capacitor C2 and the lightning protection diode F are arranged in parallel, and one end of the parallel connection is connected to the high voltage arm 1, Its other end is the ground wire.

The isolation device 3 includes an electrical signal/optical signal conversion module 7 and an optical signal/electrical signal conversion module 8. One end of the electrical signal/optical signal conversion module 7 is connected to the low-voltage arm 2, and the other end thereof is connected to the optical signal/electrical signal conversion module 8. connection, the optical signal/electrical signal conversion module 8 is connected to the secondary voltage divider 4 . Referring to Fig. 1, ES represents an electric signal, and OS represents an optical signal; the electrical signal ES input end of the electrical signal/optical signal conversion module 7 is connected to the low-voltage arm 2, and the optical signal OS output end of the electrical signal/optical signal conversion module 7 is connected to the optical signal The optical signal OS input end of the signal/electrical signal conversion module 8 and the electrical signal ES output end of the optical signal/electrical signal conversion module 8 are connected to the secondary voltage divider 4 .

The above detailed description is a specific description of the feasible embodiment of the utility model. This embodiment is not used to limit the patent scope of the utility model. Any equivalent implementation or change that does not deviate from the utility model shall be included in this case within the scope of the patent.

Claims (4)

1. A DC voltage divider with photoelectric isolation between the main body and the secondary voltage divider, characterized in that it includes a high voltage arm, a low voltage arm, a secondary voltage divider, and a device for electrically isolating the secondary voltage divider from the DC voltage divider body The isolation device, the remote module and the control protection screen; the high-voltage arm is connected to the DC high-voltage line, and the low-voltage arm is connected to the high-voltage arm to form a voltage-dividing circuit; one end of the isolation device is connected to the low-voltage The arm is connected, the other end of which is connected to the secondary voltage divider; the secondary voltage divider includes several circuits arranged in parallel, and each circuit includes a third capacitor and a third resistor arranged in parallel; the remote module and The secondary voltage divider is connected, and the remote module converts the voltage analog signal in the secondary voltage divider into an optical digital signal, and transmits it to the control protection screen. 2. The DC voltage divider with photoelectric isolation between the main body and the secondary voltage divider according to claim 1, characterized in that: the high voltage arm includes a first resistor and a first voltage equalizing capacitor, and the first resistor and the The first equalizing capacitor is connected in parallel between the DC high voltage line and the low voltage arm. 3. According to claim 1 or the DC voltage divider with photoelectric isolation between the main body and the secondary voltage divider, it is characterized in that: the low voltage arm includes a second resistor, a second equalizing capacitor and a lightning protection diode; Two resistors, the second equalizing capacitor and the lightning protection diode are arranged in parallel, one end of the parallel connection is connected to the high voltage arm, and the other end of the parallel connection is grounded. 4. The DC voltage divider with photoelectric isolation between the main body and the secondary voltage divider according to claim 1, wherein the isolation device includes an electrical signal/optical signal conversion module and an optical signal/electrical signal conversion module, the One end of the electrical signal/optical signal conversion module is connected to the low-voltage arm, and the other end is connected to the optical signal/electrical signal conversion module, and the optical signal/electrical signal conversion module is connected to the secondary voltage divider.