PT secondary side multi-point grounding fault finder based on multimode current measurement
A technology of current measurement and multi-point grounding, which is applied in the direction of measuring devices, measuring electrical variables, instruments, etc., to achieve the effects of improving system reliability, ensuring safe production of electric power, and accurate measurement
Pending Publication Date: 2022-02-11
广西电网有限责任公司防城港供电局
View PDF11 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] The purpose of the present invention is to provide a PT secondary side multi-point ground fault finder based on multi-mode current measurement, so as to realize multi-mode search for PT secondary side multi-point ground faults, accurately and comprehensively find ground faults, and solve the problem that there is currently no special purpose for searching. Instrument problems, improve system reliability, and ensure safe power production
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0025] Such as figure 1 and figure 2 As shown, a PT secondary side multi-point grounding fault finding instrument based on multi-mode current measurement includes a detection current CT 5, an instrument case 1 and a circuit board fixedly installed inside the instrument case 1; wherein: the The instrument housing 1 is provided with a display 2, function keys 3 and a current measurement interface 4; the circuit board is integrated with a power supply circuit, a current collection circuit, a main control CPU and a display circuit; the power supply circuit, current collection The circuit and the display circuit are respectively connected to the main control CPU; the display 2 is electrically connected to the display circuit; the detection current CT 5 is electrically connected to the current acquisition circuit through the current measurement interface 4 .
[0026] The detection current CT 5 is an open CT, including 4 clamp-type precision current transformers and 1 Rogowski coil...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a PT secondary side multi-point grounding fault finder based on multimode current measurement. The PT secondary side multi-point grounding fault finder comprises a detection current CT, an instrument shell and a circuit board fixedly installed in the instrument shell. The instrument shell is provided with a display, function keys and a current measurement interface; a power supply circuit, a current acquisition circuit, a master control CPU and a display circuit are integrated on the circuit board; the power supply circuit, the current acquisition circuit and the display circuit are respectively connected with the main control CPU; the display is electrically connected with the display circuit; the detection current CT is electrically connected with the current acquisition circuit through the current measurement interface. According to the invention, the current of the secondary side loop of the PT can be detected flexibly in various modes, the residual current can be measured more accurately, and the multi-point grounding fault of the PT can be judged accurately; the system reliability is improved, and power safety production is guaranteed.
Description
technical field [0001] The invention belongs to the technical field of ground fault detection equipment, and in particular relates to a PT secondary side multi-point ground fault finder based on multi-mode current measurement. Background technique [0002] The secondary side of the power system voltage transformer (PT) must be reliably grounded. The reliable grounding method is that the N wires of all PTs in the whole station are pulled back to the PT grounding cabinet in the main control room to be connected to the N600, and the N600 is uniformly grounded. According to "Key Points of Anti-accident Measures for Relay Protection and Safety Automatic Devices of Electric Power System" 8.1 The secondary circuits of current transformers and voltage transformers must have one and only one point of grounding, but due to construction and other reasons, the secondary circuits of transformers are often caused The occurrence of multi-point grounding faults will seriously endanger the s...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/52G01R35/02
CPCG01R31/52G01R35/02
Inventor 刘国盛李佳玲程旭萌郑家明吴能成何婕郭斌林海林正成黄雄瑞游晨曦黄碧薇
Owner 广西电网有限责任公司防城港供电局