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A Safe Closing Device for 10kv Step-Down Transformer

A technology of step-down transformer and gate device, which is applied to circuit devices, emergency protection circuit devices, components of emergency protection devices, etc. Safe use, reduce safety, ensure the effect of normal use

Active Publication Date: 2018-11-27
浙江国正安全技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the 10kV transformer is energized, the circuit of the transformer or the transformer in its load section may be short-circuited due to personnel mistakes or other factors, which may easily lead to safety accidents; especially for 10kV transformers used outdoors, due to their long power supply lines and long maintenance cycles , it is easy to cause safety accidents due to the short insulation resistance of the transformer or its power supply circuit when energized, affecting the safety of the power grid

Method used

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  • A Safe Closing Device for 10kv Step-Down Transformer

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0040] Such as figure 1 As shown, a safety closing device for a 10kV step-down transformer of the present invention includes a relay 7, an electromagnetic lock 4, an insulation resistance tester 8, and a controller 6, and the insulation resistance tester 8 includes a wire terminal and a ground terminal , the signal end and the shielding end, the wire end of the insulation resistance tester 8 is connected to the output end of the 10kV step-down transformer 5 through the relay 7, the shielding end is connected to the transformer shell, and the ground terminal is grounded; the controller 6 controls the insulation resistance tester 8, The relay 7 or the solenoid valve is opened and closed and receives the detection signal of the insulation resistance tester 8; the electromagnetic lock 4 is set on the switch on the primary side of the 10kV step-down transformer 5 and is used to lock or unlock the off state of the switch. The switch is a high-voltage isolating switch 3. The high-vol...

specific Embodiment 2

[0042] Such as figure 1 As shown, according to the safety closing device for a 10kV step-down transformer described in Embodiment 1, its safety closing system includes:

[0043] Control unit, including MCU, monitor, keyboard and communicator; MCU is connected with monitor, keyboard and communicator respectively;

[0044] Power grid unit, including 10kV power grid 1, high-voltage isolating switch 3, circuit breaker 2, 10kV step-down transformer 5, air switch 9, load 10, 10kV power grid 1 passes through high-voltage isolating switch 3 and circuit breaker 2 and 10kV step-down transformer 5 The secondary side of the 10kV step-down transformer 5 is connected to the load 10 through the air switch 9;

[0045] The resistance detection unit includes a relay 7, a controller 6, and an insulation resistance tester 8. The insulation resistance tester 8 includes a wire terminal, a ground terminal, a signal terminal, and a shielding terminal; The output end of the voltage transformer 5 is ...

specific Embodiment 3

[0050] According to the safety closing system for the safety closing device of the 10kV step-down transformer described in embodiment 2, its control method:

[0051] Step 1: Detect that the high-voltage isolating switch 3 and the circuit breaker 2 on the primary side of the 10kV step-down transformer 5 are in the disconnected state, and detect that the air switch 9 on the secondary side of the 10kV step-down transformer 5 is disconnected;

[0052] Step 2: The MCU controls the action of the solenoid valve and locks the high-voltage isolation switch 3 to the off state;

[0053] Step 3: The MCU controls the relay 7 to close, and at the same time controls the start of the insulation resistance tester 8 to detect the insulation resistance of the 10kV step-down transformer 5 in the no-load state; the insulation resistance value detected by the insulation resistance tester 8 is sent to the MCU and connected to the MCU The display shows;

[0054] Step 4: When the insulation resistanc...

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Abstract

The invention relates to a safety switch-on apparatus for a 10kv step-down transformer, and belongs to the field of power transmission and supply devices. The apparatus comprises a relay, an electromagnetic lock, an insulation resistance tester and a controller, wherein the insulation resistance tester comprises a line end, a ground end, a signal end and a shielding end; the line end of the insulation resistance tester is connected with the output end of the 10kv step-down transformer; the shielding end is connected with a transformer case; the ground end is grounded; the controller controls the switch-on and switch-off states of the insulation resistance tester, the relay or an electromagnetic valve, and receives a detection signal of the insulation resistance tester; and an electromagnetic lock is arranged on a switch on the primary side of the 10kv step-down transformer and used for locking or unlocking an off state of the switch. The apparatus is suitable for the use of newly produced transformers and the improvement and installation of existing 10kv transformers, enhances the universality and safety of the transformers and reduces potential safety hazards of 10kv power grids.

Description

technical field [0001] The invention relates to a safety closing device for a 10kV step-down transformer, which belongs to the field of power transmission and power supply equipment. Background technique [0002] The transformer consists of an iron core (or magnetic core) and a coil. The coil has two or more windings. The winding connected to the power supply is called the primary coil, and the remaining windings are called the secondary coil. It can transform AC voltage, current and impedance. The simplest core transformer consists of a core made of soft magnetic material and two coils with unequal turns on the core. Insulation resistance indicates the insulation performance between the coils of the transformer and between the coils and the iron core. The level of insulation resistance is related to the performance of the insulating material used, the level of temperature and the degree of humidity. [0003] When the 10kV transformer is energized, the circuit of the tran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H11/00H02H1/00
CPCH02H1/0007H02H11/005
Inventor 宗超
Owner 浙江国正安全技术有限公司