A non-electric quantity protection system power supply device and a power supply method

Abstract

The application provides a non-electric quantity protection system power supply device and a power supply method, which comprise a pressure-sensitive resistor, a DC-DC isolation power supply module and a filter; a positive input end of the DC-DC isolation power supply module is electrically connected with a positive output end of the filter, and a negative input end of the DC-DC isolation power supply module is electrically connected with a negative output end of the filter; a positive input end of the filter is electrically connected with a power supply DC+110V positive end and one end of the pressure-sensitive resistor, and a negative input end of the filter is electrically connected with a power supply DC-110V negative end and the other end of the pressure-sensitive resistor; a feeding positive bus end of the DC-DC isolation power supply module is electrically connected with a positive electrode of external equipment and a microcomputer non-electric quantity protection device, a feeding negative bus end of the DC-DC isolation power supply module is electrically connected with a negative electrode of the microcomputer non-electric quantity protection device, and the feeding negative bus end of the DC-DC isolation power supply module is grounded. The application can effectively prevent non-stop accidents caused by insulation problems of a non-electric quantity DC loop.

Description

Technical Field

[0001] This invention relates to the field of power supply non-electrical quantity measurement and control systems, specifically to a power supply device and method for a non-electrical quantity protection system. Background Technology

[0002] High-voltage power supply systems typically use DC power for non-electrical quantity control circuits. The control circuit is generally in the form of DC 220V (+110V -110V) depending on the drive voltage. The DC non-electrical quantity control circuit is formed by the DC +110V power supply returning to the DC -110V terminal through the main switch, branch switches, external equipment contacts, and a microprocessor-based non-electrical quantity protection device. Figure 2 As shown;

[0003] This conventional power supply control mode has significant drawbacks. High-voltage non-electrical quantity control circuits experience frequent tripping accidents annually due to insulation aging, external damage, temperature increases, and rodent / termite infestations. The most common scenario is a ground fault at point A followed by insulation degradation at point B, effectively short-circuiting external equipment contacts and triggering protection or tripping circuits, causing non-shutdown accidents. Furthermore, non-electrical quantity circuits consist of hundreds or thousands of branches, exhibiting capacitive current and high-resistance grounding phenomena. In a non-electrical quantity microprocessor protection and control circuit, a ground fault at point B alone can trigger the protection device.

[0004] Non-electrical quantity drives have high voltage, requiring high insulation of equipment and lines, and resulting in high manufacturing and safety costs.

[0005] Uninterruptions caused by insulation failure occur frequently in major power supply systems. Therefore, the insulation requirements for non-electrical secondary circuits are very high to prevent grounding of positive and negative control circuits. High-voltage power supplies are generally supplied over large areas, and any uninterruption incident will result in huge economic losses. Summary of the Invention

[0006] The present invention aims to provide a power supply device and method for a non-electrical quantity protection system. The device has a scientific and reasonable structure and is easy to install. Using this device and power supply method, non-electrical quantity DC circuit insulation problems can be effectively prevented from causing non-stop accidents.

[0007] The power supply device for the non-electrical quantity protection system includes a varistor, a DC-to-DC isolated power supply module, and a filter;

[0008] The positive input terminal of the DC-to-DC isolated power supply module is electrically connected to the positive output terminal of the filter, and the negative input terminal of the DC-to-DC isolated power supply module is electrically connected to the negative output terminal of the filter. The positive input terminal of the filter is electrically connected to the positive terminal of the +110V DC power supply and one end of the varistor, and the negative input terminal of the filter is electrically connected to the negative terminal of the -110V DC power supply and the other end of the varistor. The positive bus terminal of the DC-to-DC isolated power supply module is simultaneously electrically connected to the positive terminal of the external equipment and the microcomputer non-electrical quantity protection device, and the negative bus terminal of the DC-to-DC isolated power supply module is electrically connected to the negative terminal of the microcomputer non-electrical quantity protection device. The negative bus terminal of the DC-to-DC isolated power supply module is grounded.

[0009] The positive terminal of the +110V DC power supply and the negative terminal of the -110V DC power supply are connected to the +110V DC power supply bus and the -110V DC power supply bus respectively via branch switches.

[0010] The aforementioned microcomputer-based non-electrical quantity protection device is model ABB / UFC092BE or Zhongdian SZD-11S.

[0011] The varistor in question is model MYG-32D621K.

[0012] The DC-to-DC isolated power supply module, after grounding its negative terminal, converts +110V -110V DC power into +24V -0V DC power, +48V -0V DC power, or +220V -0V DC power.

[0013] The DC-to-DC isolated power supply module is model NHD220D220.

[0014] The filter in question is CW4-10A-S(004).

[0015] The aforementioned power supply method for a non-electrical quantity protection system, applied to a power supply device for a non-electrical quantity protection system, includes the following steps:

[0016] Using a DC-to-DC isolation power supply module (2), the negative bus terminal of its feedout is grounded, so that the negative terminal of the microcomputer non-electrical quantity protection device connected to it is also grounded, and the input +110V-110V DC power is changed to +24V-0V DC power, +48V-0V DC power, or +220-0V DC power, and output to the microcomputer non-electrical quantity protection device to supply power to the microcomputer non-electrical quantity protection device.

[0017] The varistor (1) is used to protect the DC-to-DC isolated power supply module (2).

[0018] The filter (3) is used to filter the current, making the power supply of the microcomputer non-electrical protection device more stable.

[0019] This invention changes the DC power supply mode of the non-electrical quantity control circuit drive from DC220V (+110V -110V) to 220V (+220V -0V). This non-electrical quantity control power supply mode eliminates the tripping accidents caused by single-point or multi-point grounding, which are most common in conventional control power supply modes. When a ground fault occurs at point B of the measurement and control protection input terminal, the potential at point B will remain at the same potential as DC-0V, with no voltage difference. Grounding under any circumstances will not cause the circuit to trip. Faults on the secondary side of the isolated power module will not affect the primary side DC power supply system, ensuring the stable operation of the power supply system and showing good application prospects. Attached Figure Description

[0020] Figure 1 This is a circuit diagram of the power supply method for the non-electrical quantity protection system in an embodiment;

[0021] Figure 2 This is a circuit diagram of a power supply method for a non-electrical quantity protection system in the prior art;

[0022] Figure 3 This is a circuit diagram of the filter in the embodiment;

[0023] The names and numbers in the diagram are as follows:

[0024] 1-Varistor, 2-DC to DC isolation power supply module, 3-Filter. Detailed Implementation

[0025] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention. Example 1

[0026] like Figure 1 As shown, the power supply device for the non-electrical protection system includes a varistor 1, a DC-to-DC isolation power supply module 2, and a filter 3.

[0027] The positive input terminal of the DC-to-DC isolated power supply module 2 is electrically connected to the positive output terminal of the filter 3, and the negative input terminal of the DC-to-DC isolated power supply module 2 is electrically connected to the negative output terminal of the filter 3. The positive input terminal of the filter 3 is electrically connected to the positive terminal of the +110V power supply and one end of the varistor 1, and the negative input terminal of the filter 3 is electrically connected to the negative terminal of the -110V power supply and the other end of the varistor 1. The positive bus terminal of the DC-to-DC isolated power supply module 2 is simultaneously electrically connected to the positive terminal of the external equipment and the microcomputer non-electrical quantity protection device, and the negative bus terminal of the DC-to-DC isolated power supply module 2 is electrically connected to the negative terminal of the microcomputer non-electrical quantity protection device. The negative bus terminal of the DC-to-DC isolated power supply module 2 is grounded.

[0028] The positive terminal of the DC +110 power supply and the negative terminal of the DC -110 power supply are connected to the DC power bus +110 and the DC power bus -110 respectively via branch switch 4.

[0029] The aforementioned microcomputer-based non-electrical quantity protection device is model ABB / UFC092BE or Zhongdian SZD-11S.

[0030] The varistor in question is model MYG-32D621K.

[0031] The DC-to-DC isolated power supply module converts +110V -110V DC power to +220V -0V DC power after the negative terminal is grounded.

[0032] The DC-to-DC isolated power supply module is model NHD220D220.

[0033] The filter in question is CW4-10A-S(004).

[0034] In this embodiment, the non-electrical quantity protection system power supply method is used to change the driving DC voltage DC220V (+110V -110V) power supply mode to 220V (+220V -0V) DC power supply mode. The DC control circuit is formed by the power supply DC+220V through the main switch → branch switch 4 → power module DC+48V2 → external equipment grounding point → microcomputer non-electrical quantity protection device back to DC-0V terminal.

Claims

1. A non-electric quantity protection system power supply device, comprising a pressure sensitive resistor (1), a DC-DC isolation power supply module (2), and a filter (3), characterized in that: the positive input end of the DC-DC isolation power supply module (2) is electrically connected with the positive output end of the filter (3), and the negative input end of the DC-DC isolation power supply module (2) is electrically connected with the negative output end of the filter (3); the positive input end of the filter (3) is electrically connected with a power supply DC +110V positive end and one end of the pressure sensitive resistor (1), and the negative input end of the filter (3) is electrically connected with a power supply DC -110V negative end and the other end of the pressure sensitive resistor (1); the feeding positive bus end of the DC-DC isolation power supply module (2) is electrically connected with an external device and a positive pole of a microcomputer non-electric quantity protection device, the feeding negative bus end of the DC-DC isolation power supply module (2) is electrically connected with a negative pole of the microcomputer non-electric quantity protection device, and the feeding negative bus end of the DC-DC isolation power supply module (2) is grounded; the power supply DC +110V positive end and the power supply DC -110V negative end are respectively connected with a DC power supply bus +110V and a DC power supply bus -110V through a branch switch (4); the feeding negative bus end of the DC-DC isolation power supply module (2) converts +110V -110V DC into +24V -0V DC, +48V -0V DC or +220V -0V DC after being grounded, and outputs to the microcomputer non-electric quantity protection device to supply power to the microcomputer non-electric quantity protection device. The model of the pressure sensitive resistor (1) is MYG-32D621K. The method comprises the following steps: The feeding negative bus end of the DC-DC isolation power supply module (2) is grounded, so that the negative pole of the microcomputer non-electric quantity protection device connected with the DC-DC isolation power supply module (2) is also grounded, and the input +110V -110V DC is changed into +24V -0V DC, +48V -0V DC or +220V -0V DC, which is output to the microcomputer non-electric quantity protection device to supply power to the microcomputer non-electric quantity protection device.

2. The non-electrical quantity protection system power supply device according to claim 1, characterized in that:

4. The non-electric quantity protection system power supply method according to claim 3, characterized in that: the pressure sensitive resistor (1) is used for protecting the DC-DC isolation power supply module (2).

3. The non-electric quantity protection system power supply method applied to the non-electric quantity protection system power supply device according to claim 1 or 2, characterized in that, The filter (3) is used for filtering the AC component in the DC, so that the power supply of the microcomputer non-electric quantity protection device is more stable. ​ ​ ​ 5. The non-electrical quantity protection system power supply method of claim 4, wherein: ​

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