Direct-current power supply device for debugging secondary equipment

Abstract

The utility model discloses a DC power supply device for debugging secondary equipment, which comprises an AC input module, a rectifier module, a universal change-over switch, a DC converter and an insulation monitoring module, the AC input module is electrically connected with the rectifier module through a power switch, and the rectifier module is electrically connected with a DC output bus through universal change-over switch contacts K1 and K2. The rectifier module is electrically connected with the direct-current converter through the universal change-over switch contacts K5 and K6, the direct-current converter is electrically connected with the direct-current output bus, and the insulation monitoring module is electrically connected with the direct-current output bus. According to the utility model, the switching output of 220V and 110V DC voltage is realized, the insulation monitoring of the DC output voltage is realized, a DC power supply for debugging can be provided for secondary devices with different DC voltage levels, the device is convenient to wire, convenient to carry and high in universality, and the convenience of debugging on-site use is improved.

Description

Technical Field

[0001] The utility model relates to the field of power supply devices, in particular to a direct current power supply device for debugging secondary equipment. Background Art

[0002] The secondary equipment of power plants and substations mainly includes relay protection devices, measurement and control devices, safety automatic devices, etc., and their working voltage is usually DC 220V or 110V. When debugging during the equipment transformation or expansion stage, the secondary device needs to be connected to a temporary DC power supply. The temporary DC power supply is often taken from the DC output of the test power supply panel in the relay protection room. The DC voltage output by the test power supply panel is continuously adjustable within the range of 0 to 250V. When taking DC power, it is necessary to adjust the output voltage knob while using a multimeter to confirm whether the target DC voltage is reached. After the voltage is adjusted, it is sometimes necessary to temporarily extend the cable to the debugging panel cabinet. Moreover, there is no test power supply panel in the relay protection room of substations below 110kV, which also brings certain difficulties to taking temporary DC power supply and is not convenient for on-site debugging.

[0003] In addition, the DC power supply on the test power supply panel does not have an insulation monitoring function, cannot reflect the positive and negative pole voltages to the ground, and cannot detect the grounding conditions of the secondary circuit during debugging. When the formal DC power supply is connected, the operating equipment may trip incorrectly due to DC grounding. Utility Model Content

[0004] The utility model provides a DC power supply device for debugging secondary equipment, which solves the problems of inconvenient voltage regulation and inability to monitor DC power supply insulation in the above-mentioned background technology, and has the advantages of high versatility, small size and convenient carrying.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a DC power supply device for debugging secondary equipment, including an AC input module, a rectifier module, a universal conversion switch, a DC converter, and an insulation monitoring module, wherein: the AC input module is electrically connected to the rectifier module through the power switch, the rectifier module is electrically connected to the DC output bus through the universal conversion switch contacts K1 and K2, the rectifier module is electrically connected to the DC converter through the universal conversion switch contacts K5 and K6, the DC converter is electrically connected to the DC output bus, and the insulation monitoring module is electrically connected to the DC output bus.

[0006] In the above-mentioned DC power supply device for debugging secondary equipment, the AC input module has an AC charging socket.

[0007] In the above-mentioned DC power supply device for debugging secondary equipment, the DC converter converts 220V DC power into 110V DC power.

[0008] The above-mentioned DC power supply device for debugging secondary equipment, the insulation monitoring module is a DC balanced bridge circuit, the bridge resistance value of the balanced bridge is matched with the DC voltage level, the balanced bridge has two bridge resistors, namely R1 and R2, when the DC voltage level is 220V, the balanced bridge resistance value is R1, when the DC voltage level is 110V, the balanced bridge resistance value is R2.

[0009] The above-mentioned DC power supply device for debugging secondary equipment, the universal conversion switch is provided with a panel and a knob, the panel is provided with three gears of 220V, stop, and 110V, one end of the knob is provided with a black indicator, when the black indicator points to the 220V gear: the K1, K2, K3, and K4 contacts of the universal conversion switch are turned on.

[0010] In the above-mentioned DC power supply device for debugging secondary equipment, when the black indicator of the universal conversion switch points to the 110V gear position: the K5, K6, K7, and K8 contacts of the universal conversion switch are turned on.

[0011] For the DC power supply device for debugging secondary equipment mentioned above, when the black indicator of the universal conversion switch points to the stop position: the contacts K1, K2, K3, K4, K5, K6, K7 and K8 of the universal conversion switch are all not conducting.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model adopts an AC input module, a rectifier module, a universal conversion switch, a DC converter, and an insulation monitoring module, and realizes the switching output of 220V and 110V DC voltages through the universal conversion switch, and realizes the insulation monitoring of the DC output voltage, and can provide a DC power supply for debugging of secondary devices of different DC voltage levels. The device is easy to wire, easy to carry, and has strong versatility, which improves the convenience of use when debugging on site. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0014] Figure 1 Schematic diagram of DC power supply device for debugging secondary equipment;

[0015] Figure 2 The DC balance bridge circuit diagram of the insulation monitoring module of the DC power supply device for secondary equipment debugging;

[0016] Figure 3 This is a schematic diagram of the structure of the universal conversion switch of the DC power supply device for secondary equipment debugging.

[0017] In the figure: 1, AC input module 2, rectifier module 3, universal conversion switch 4, DC converter 5, insulation monitoring module 6, power switch 7, DC output bus. DETAILED DESCRIPTION

[0018] The accompanying drawings are only used for illustrative purposes and should not be construed as limiting the present invention. The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] like Figure 1 , Figure 2 , Figure 3 As shown, a DC power supply device for debugging secondary equipment includes an AC input module 1, a rectifier module 2, a universal conversion switch 3, a DC converter 4, and an insulation monitoring module 5, wherein: the AC input module 1 is electrically connected to the rectifier module 2 through the power switch 6, the rectifier module 2 is electrically connected to the DC output bus 7 through the contacts K1 and K2 of the universal conversion switch 3, the rectifier module 2 is electrically connected to the DC converter 4 through the contacts K5 and K6 of the universal conversion switch 6, the DC converter 4 is electrically connected to the DC output bus 7, and the insulation monitoring module 5 is electrically connected to the DC output bus 7.

[0020] More specifically, the AC input module 1 has an AC charging socket.

[0021] More specifically, the DC converter 4 converts 220V DC power into 110V DC power.

[0022] More specifically, the insulation monitoring module 5 is a DC balanced bridge circuit, and the bridge resistance value of the balanced bridge is matched with the DC voltage level. The balanced bridge has two bridge resistors, namely R1 and R2. When the DC voltage level is 220V, the balanced bridge resistance value is R1, and when the DC voltage level is 110V, the balanced bridge resistance value is R2.

[0023] More specifically, the universal conversion switch 3 is provided with a panel and a knob. The panel is provided with three gears of 220V, stop, and 110V. A black indicator is provided at one end of the knob. When the black indicator points to the 220V gear: the K1, K2, K3, and K4 contacts of the universal conversion switch 3 are turned on.

[0024] More specifically, when the black indicator of the universal conversion switch 3 points to the 110V gear position: the contacts K5, K6, K7, and K8 of the universal conversion switch 3 are turned on.

[0025] More specifically, when the black indicator of the universal conversion switch 3 points to the stop position: the contacts K1, K2, K3, K4, K5, K6, K7, and K8 of the universal conversion switch 3 are all not conducting.

[0026] During specific use, for the sake of safety, the DC output bus 7 should first be connected to the power line of the secondary device at the load end. After confirming whether the working voltage of the secondary device is 220V or 110V, turn the black indicator of the universal conversion switch 3 to the confirmed voltage position, plug the power cord into the AC charging socket of the AC input module 1, turn on the power switch 6, and the AC power is input to the AC input module 1 through the power cord, and then rectified by the rectifier module 2. According to the selected gear of the universal conversion switch 3, DC voltage of different voltage levels is output. At the same time, the insulation monitoring module 5 monitors the insulation of the DC output bus 7 to the ground, thereby realizing the output of the DC power supply voltage of the commonly used secondary devices in power plants and substations and the monitoring of the insulation of the DC bus to the ground.

[0027] Obviously, the present invention is not limited to the above-mentioned embodiments, which are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A DC power supply device for debugging secondary equipment, characterized in that: It includes an AC input module, a rectifier module, a universal conversion switch, a DC converter, and an insulation monitoring module, wherein: the AC input module is electrically connected to the rectifier module through a power switch, the rectifier module is electrically connected to the DC output bus through the universal conversion switch contacts K1 and K2, the rectifier module is electrically connected to the DC converter through the universal conversion switch contacts K5 and K6, the DC converter is electrically connected to the DC output bus, and the insulation monitoring module is electrically connected to the DC output bus.

2. The DC power supply device for debugging secondary equipment according to claim 1, characterized in that: The AC input module has an AC charging socket.

3. The DC power supply device for secondary equipment debugging according to claim 1, characterized in that: The DC converter converts 220V DC power into 110V DC power.

4. The DC power supply device for debugging secondary equipment according to claim 1, characterized in that: The insulation monitoring module is a DC balanced bridge circuit, and the bridge resistance value of the balanced bridge is matched with the DC voltage level. The balanced bridge has two bridge resistors, namely R1 and R2. When the DC voltage level is 220V, the balanced bridge resistance value is R1, and when the DC voltage level is 110V, the balanced bridge resistance value is R2.

5. The DC power supply device for debugging secondary equipment according to claim 1, characterized in that: The universal conversion switch is provided with a panel and a knob. The panel is provided with three gears of 220V, stop and 110V. One end of the knob is provided with a black indicator. When the black indicator points to the 220V gear: the K1, K2, K3 and K4 contacts of the universal conversion switch are turned on.

6. The DC power supply device for debugging secondary equipment according to claim 5, characterized in that: When the black indicator of the universal conversion switch points to the 110V gear position: the contacts K5, K6, K7, and K8 of the universal conversion switch are turned on.

7. The DC power supply device for debugging secondary equipment according to claim 6, characterized in that: When the black indicator of the universal conversion switch points to the stop position: the contacts K1, K2, K3, K4, K5, K6, K7, and K8 of the universal conversion switch are all not conducting.

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