Voltage measuring circuit suitable for 6 kV and 10 kV high-voltage power supply

Abstract

The utility model discloses a voltage measuring circuit suitable for a 6kV and 10kV high-voltage power supply. The voltage measuring circuit comprises a 6kV power supply, a 10kV power supply, a voltage selection switch HK, a fuse FU, a relay KA, a voltage transformer YH and a power supply transformer KB. The voltage selection switches HK are respectively provided with four paths; the 10kV power supply is connected with one path and two paths of the voltage selection switch HK; a first contact and a second contact of the voltage selection switch HK are connected with the relay KA1; an A631, a B631 and a C631 are connected with a voltage transformer YH; the fuse FU is connected with the voltage transformer YH; and the fuse FU is connected with the relay KA. The beneficial effects of the utility model are that the voltage measurement of the high-voltage power supply uses the voltage transformer to carry out voltage conversion, high voltage is converted into low voltage 100V for an instrument to carry out measurement and metering reading, the secondary voltage of the voltage transformer with the rated voltage of 10kV is 100V, the secondary voltage of the voltage transformer is 60V when the voltage transformer is connected with the voltage of 6kV, and the secondary voltage of the voltage transformer with the rated voltage of 10kV is 100V. Therefore, the transformer is connected to the secondary side to convert 60V into 100V, and the 10kV voltage transformer can be used in 6kV and 10kV systems.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage power supply voltage measurement devices, in particular to a voltage measurement circuit suitable for 6kV and 10kV high-voltage power supplies. Background Art

[0002] High-voltage power supply voltage measurement devices are a key component of power supply and distribution equipment. The different voltage levels used in power supply networks (the owner provides 6 or 10 kV to the construction company) directly determine the primary voltage measurement equipment used by the construction company. Different projects and regions use different power supply voltages, and construction companies must prepare voltage measurement equipment at different voltage levels to meet the needs of their projects, increasing project investment.

[0003] The voltage transformer secondary voltage conversion circuit is used to realize the 6kV and 10kV conversion problem of a voltage measuring device, which can be used in 6KV and 10KV power supply systems.

[0004] Therefore, a voltage measurement circuit suitable for 6kV and 10kV high voltage power supplies is proposed. Summary of the Invention

[0005] The purpose of the present utility model is to provide a voltage measurement circuit suitable for 6kV and 10kV high voltage power supplies, so as to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A voltage measurement circuit suitable for 6 and 10kV high-voltage power supplies includes a 6kV power supply, a 10kV power supply, a voltage selector switch HK, a fuse FU, a relay KA, a voltage transformer YH, and a power transformer KB; the voltage selector switch HK is provided with four contacts; the 10kV power supply is connected to the first and second contacts of the voltage selector switch HK; the first and second contacts of the voltage selector switch HK are connected to the relay KA1;

[0008] A631, B631, and C631 are connected to the voltage transformer YH; the fuse FU is connected to the voltage transformer YH; the fuse FU is connected to the relay KA; the relay KA is connected to the protection and control switch KB, and the control switch KB is connected to the air switch QF; the 6kV power supply is connected to the air switch QF.

[0009] Furthermore, when the voltage selection switch HK is turned on, the coil of relay KA1 is electrically attracted.

[0010] Furthermore, when the contacts of relay KA1 are turned on, A631, B631, and C631 connect the voltage transformer.

[0011] Furthermore, when the three-way and four-way of the voltage selection switch HK are disconnected, the contacts of the relay KA2 are disconnected.

[0012] Furthermore, the primary and secondary circuits of the power transformers 1KB and 2KB are disconnected.

[0013] Furthermore, when the secondary voltage of the voltage transformer YH is lower than 100 volts, the voltage detection module KV is released.

[0014] Furthermore, the coil of relay KA2 is energized and closed, and its contact KA2 is closed to connect the primary and secondary circuits of 1KB and 2KB.

[0015] Furthermore, the three contacts and the four contacts of the voltage selection switch HK are disconnected.

[0016] Furthermore, a voltage measurement circuit consisting of power transformers 1KB and 2KB is connected at A631, B631, and C631 to measure a 6kV power supply voltage.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] High-voltage power supply voltage measurement uses a voltage transformer to convert the high voltage into a low voltage of 100V for the instrument to measure and read the value. The secondary voltage of a voltage transformer with a rated voltage of 10kV is 100V. When the voltage transformer is connected to a 6kV voltage, its secondary voltage is 60V. Therefore, a transformer is connected to its secondary side to convert 60V to 100V, so that a 10kV voltage transformer can be used in 6kV and 10kV systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a circuit diagram of the utility model;

[0020] Figure 2 This is a schematic diagram of the power supply of the present utility model. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0022] Example 1:

[0023] See also Figure 1-2 , the utility model provides a technical solution:

[0024] A voltage measurement circuit suitable for 6kV and 10kV high-voltage power supplies, comprising a 6kV power supply, a 10kV power supply, a voltage selection switch HK, a fuse FU, a relay KA, a voltage transformer YH, and a power transformer KB;

[0025] The voltage selection switch HK is equipped with four circuits; the 10kV power supply is connected to the first and second contacts of the voltage selection switch HK; the first and second contacts of the voltage selection switch HK are connected to the relay KA1, at this time A631, B631, and C631 are connected to the voltage transformer YH; the fuse FU is connected to the voltage transformer YH; the fuse FU is connected to the relay KA; the relay KA is connected to the protection and control switch KB, and the control switch KB is connected to the air switch QF; the 6kV power supply is connected to the air switch QF.

[0026] When the voltage selection switch HK is connected, the relay KA1 coil is electrically attracted.

[0027] When the relay KA1 contact is connected, A631, B631, and C631 connect the voltage transformer.

[0028] When the three contacts and four contacts of the voltage selection switch HK are disconnected, the contacts of relay KA2 are disconnected.

[0029] The primary and secondary lines of the power transformers 1KB and 2KB are disconnected, and the voltage detection module KV is released when the secondary voltage of the voltage transformer YH is lower than 100 volts.

[0030] The coil of relay KA2 is energized and closed, and its contact KA2 is closed to connect the primary and secondary circuits of 1KB and 2KB, and disconnect the three contacts and four contacts of the voltage selection switch HK.

[0031] Connect A631, B631, and C631 to the voltage measurement circuit composed of power transformers 1KB and 2KB to measure the 6kV power supply voltage.

[0032] Working principle:

[0033] When the power supply is 10kV, put the voltage selector switch HK in the 10kV position. At this time, the first and second circuits of the voltage selector switch HK are connected, the coil of the intermediate relay KA1 is electrically attracted, and its normally open contact KA1 is connected. At this time, A631, B631, and C631 are connected to the secondary of the voltage transformer and energized, thereby displaying the power supply voltage.

[0034] At this time, the three contacts and contact path of the voltage selection switch HK are disconnected, so that the intermediate relay KA2 is in a released state, and its contact KA2 is disconnected, at this time disconnecting the primary and secondary circuits of the power transformers 1KB and 2KB.

[0035] When the power supply is 6kV, close the automatic air circuit breakers 1QF and 2QF, and set the voltage selector switch HK to the 6kV position. At this time, the first and second circuits of the voltage selector switch HK are connected, preparing for the intermediate relay KA2 to be energized.

[0036] Since the secondary voltage of the voltage transformer is lower than 100 volts, the voltage detection module KV is released, its normally closed contact KV is closed, the intermediate relay KA2 coil is energized and closed, and its contact KA2 is closed to connect the primary and secondary lines of 1KB and 2KB. At the same time, the three contacts and four contacts of the voltage selection switch HK are disconnected, the intermediate relay KA1 coil loses power, and its normally open contact KA1 is disconnected. The voltage measurement circuit composed of 1KB and 2KB is connected at A631, B631, and C631, and a 6kV power supply voltage is measured.

[0037] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A voltage measurement circuit suitable for 6kV and 10kV high voltage power supplies, characterized in that: Including 6kV power supply, 10kV power supply, voltage selector switch HK, fuse FU, relay KA, voltage transformer YH, power transformer KB; The voltage selection switch HK is provided with four contacts respectively; 10kV power supply connection voltage selector switch HK contact one and two; Voltage selection switch HK one and two are connected to relay KA1; A631, B631, and C631 are connected to voltage transformer YH; Fuse FU is connected to voltage transformer YH; Fuse FU is connected to relay KA; Relay KA is connected to the protection and control switch KB, and the control switch KB is connected to the air switch QF; The 6kV power supply is connected to the air switch QF.

2. The voltage measurement circuit adapted for 6kV and 10kV high voltage power supplies according to claim 1, characterized in that: When the voltage selection switch HK is connected, the relay KA1 coil is electrically attracted.

3. The voltage measurement circuit adapted for 6kV and 10kV high voltage power supplies according to claim 2, characterized in that: When the relay KA1 contact is connected, A631, B631, and C631 connect the voltage transformer.

4. The voltage measurement circuit adapted for 6kV and 10kV high voltage power supplies according to claim 3, characterized in that: When the three-way or four-way voltage selection switch HK is disconnected, the contacts of relay KA2 are disconnected.

5. The voltage measurement circuit adapted for 6kV and 10kV high voltage power supplies according to claim 4, characterized in that: The primary and secondary circuits of power transformers 1KB and 2KB are disconnected.

6. The voltage measurement circuit adapted for 6kV and 10kV high voltage power supplies according to claim 1, characterized in that: When the secondary voltage of the voltage transformer YH is lower than 100 volts, the voltage detection module KV is released.

7. The voltage measurement circuit adapted for 6kV and 10kV high voltage power supplies according to claim 6, characterized in that: The relay KA2 coil is energized and closed, and its contact KA2 is closed to connect the primary and secondary circuits of 1KB and 2KB.

8. The voltage measurement circuit adapted for 6kV and 10kV high voltage power supplies according to claim 7, characterized in that: The three contacts and the four contacts of the voltage selection switch HK are disconnected.

9. The voltage measurement circuit adapted for 6kV and 10kV high voltage power supplies according to claim 8, characterized in that: A631, B631, and C631 are connected to a voltage measurement circuit consisting of power transformers 1KB and 2KB to measure a 6kV power supply voltage.

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