CN204116526U - Iron core grounding electric current on-Line Monitor Device - Google Patents
Iron core grounding electric current on-Line Monitor Device Download PDFInfo
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- CN204116526U CN204116526U CN201420692402.8U CN201420692402U CN204116526U CN 204116526 U CN204116526 U CN 204116526U CN 201420692402 U CN201420692402 U CN 201420692402U CN 204116526 U CN204116526 U CN 204116526U
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 238000012544 monitoring process Methods 0.000 claims description 24
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- 238000005516 engineering process Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 4
- 238000012806 monitoring device Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000011900 installation process Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 101000823089 Equus caballus Alpha-1-antiproteinase 1 Proteins 0.000 description 2
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- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
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- 229910000976 Electrical steel Inorganic materials 0.000 description 1
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- 238000006243 chemical reaction Methods 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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Abstract
The utility model provides a kind of iron core grounding electric current on-Line Monitor Device, it comprises power supply, control panel, A/D metering circuit, E2 storer, master chip circuit, display circuit, current-limiting circuit, communicating circuit, warning circuit, it is characterized in that power supply, control panel, A/D metering circuit, E2 storer, display circuit, current-limiting circuit, communicating circuit, warning circuit are connected with master chip circuit respectively.It can simultaneously to unshakable in one's determination and clamp earthing current is monitored and current limliting.Do not change the wiring of original power equipment, ground connection pattern, any interference and impact can not be caused on primary system.
Description
Technical field
The utility model relates to a kind of transformer grounding line monitoring device, particularly relates to a kind of iron core grounding electric current on-Line Monitor Device.
Background technology
The transformer core single-point grounding of normal operation, if there are more than 2 or 2 ground connection simultaneously, then current return will be formed between iron core and the earth, maximum current can reach tens amperes, it is unshakable in one's determination overheated to cause, even burn, so Real-Time Monitoring and control need be carried out to the electric current of transformer grounding line.The current processing mode judging the detection means whether transformer core exists multipoint earthing and electric current is transfinited, there are following three problems: one, existing on-line monitoring system monitoring and current limliting way few, cause hidden troubles removing comprehensively and detection system installation cost high; Two, the current acquisition function in existing Transformer Core Grounding current monitoring system cannot take into account wide range and high precision; Three, existing on-line monitoring system, needs Transformer Core Grounding line to open during installation, the complicated and impact introduced transformer of installation process.
(1), in most cases, 220kV and above transformer core and folder draw ground connection respectively, and have insulation between them.The iron core of below 220kV transformer and folder share an earthing bar.Existing Transformer Core Grounding current monitoring system is all only monitored iron core grounding electric current, clamp earthing current is not monitored, or need two cover monitoring systems to be installed transformer is other, so to the investigation of hidden danger not comprehensively or add system installation cost.And existing most monitoring system can only accomplish to measure and overload alarm electric current, can not deal with to electric current overrun condition, need by artificial treatment, and causing trouble process not in time.
(2), transformer normal condition time, unshakable in one's determination, clamp earthing current is generally at below 100mA.When there is multipoint earthing situation, ground current more than 100mA, can likely reach 4 A, 5A, may reach 10A, 20A time indivedual.Conventional belt electrical measurement range is 1mA ~ 10A, and ground current is more than 10A, and test result will become insincere, cannot take into account wide range and high precision.
(3), transformer core, clamp earthing current be generally cable by tape insulation skin or ground connection band iron, draws, extend to transformer bottom along transformer case, direct single-point grounding from the top of transformer through insulating sleeve.Insulated hull cable size is generally at 20mm, and ground connection band iron full-size is 10mm × 80mm.Current transformer in existing Transformer Core Grounding current monitoring device, cannot meet the requirement of most ground connection band iron large scale.Existing monitoring device, in installation process, needs to dismantle tested ground wire, is directly connected in series device into ground wire, and the complicated and impact introduced transformer of installation process, once monitoring device fault likely causes the danger such as ground wire open circuit.
Iron core is the magnetic circuit part be made up of siliconized plate in ground wire.
Folder is the hardware of fixed iron core in ground wire.
Why does unshakable in one's determination and folder want ground connection? iron core and folder, under action of alternating magnetic field, can produce interrupted suspended discharge.Electric discharge can have harmful effect to transformer oil and solid insulation.In order to eliminate this impact, then must, by unshakable in one's determination and folder ground connection, them be made to be in zero potential together.
Why want single-point grounding? if unshakable in one's determination and folder has or multipoint earthing at 2, closed-loop path will be formed between earth point and cause circulation, local overheating will be caused, cause oil decomposition, decreasing insulating, electrical steel sheet can be made time serious to burn out, cause main transformer major accident.So unshakable in one's determination and folder single-point grounding only.
Transformer core and folder Grounding? in most cases, 220kV and above transformer core and folder draw ground connection respectively, and have insulation between them.The iron core of below 220kV transformer and folder share an earthing bar.
The Harm of Treatment for Grounding Fault of Transformer Core? have the high-power transformer of iron core grounding defect to account for and run 2% ~ 4% of total number of units, the accident that multipoint earthing of clamping piece of transformer causes is relatively less.Iron core grounding fault has become one of transformer frequent failure.According to operation department statistics, the accident that unshakable in one's determination and multipoint earthing of clamping piece causes accounts for the 3rd of all kinds of fault of transformer.
Summary of the invention
The purpose of this utility model be to provide a kind of can simultaneously to unshakable in one's determination and clamp earthing current is monitored and the iron core grounding electric current on-Line Monitor Device of current limliting.
To achieve these goals, the utility model have employed following technical proposals.A kind of iron core grounding electric current on-Line Monitor Device, it comprises power supply, control panel, A/D metering circuit, E2 storer, master chip circuit, display circuit, current-limiting circuit, communicating circuit, warning circuit, it is characterized in that power supply, control panel, A/D metering circuit, E2 storer, display circuit, current-limiting circuit, communicating circuit, warning circuit are connected with master chip circuit respectively.
Described master chip circuit comprises master chip STM32F107VCT6.
Described power supply is HAT200-24H24-NFCI Switching Power Supply, and input end connects air switch, and output terminal connects master chip circuit.
Described control panel comprise control on-line monitoring unshakable in one's determination, automatic current limiting unshakable in one's determination, manual current limliting unshakable in one's determination a cutter three throw waver 1, waver 2 thrown by one cutter three of control folder on-line monitoring, automatic current limiting unshakable in one's determination, manual current limliting unshakable in one's determination, current-limiting resistance gear rising touch key unshakable in one's determination, the decline of current-limiting resistance gear touch key, folder current-limiting resistance gear rising touch key and folder current-limiting resistance gear decline touch key unshakable in one's determination.
Described A/D metering circuit comprises steel core current transformer and folder current transformer, and steel core current transformer connects a rectifying and wave-filtering amplifier LM324, then connects the iron core grounding electric current input pin TIEXIN_I of master chip circuit; Folder current transformer connects another rectifying and wave-filtering amplifier LM324, then connects the clamp earthing current input pin JIAJIAN_I of master chip circuit.Steel core current transformer and folder current transformer adopt open-close type current transformer.Open-close type current transformer adopts up-to-date CT technology, multilayer screen technology, hardly by the impact of external magnetic field, has waterproof, anti-rain, drip-proof function simultaneously, ensure that high precision, high stability, the high reliability of long-term free of discontinuities on-line monitoring.
Described master chip inside circuit integrated simulation amount input pin PA11, the iron core grounding electric current input pin TIEXIN_I of PA12 and A/D metering circuit, clamp earthing current input pin JIAJIAN_I.PA11 pin is connected with two signal sampling channels (passage 1, passage 2) of master chip inside circuit A/D module again, when steel core current value is less than 100mA, final current value equals the value of passage 1, and when steel core current value is greater than 100mA, final current value equals the value of passage 2.PA12 pin is connected with two signal sampling channels (passage 3, passage 4) of master chip inside circuit A/D module again, when folder current value is less than 100mA, final current value equals the value of passage 3, and when folder current value is greater than 100mA, final current value equals the value of passage 4.Realize 12 A/D samplings to iron core grounding electric current, clamp earthing current.The measuring accuracy of passage 3 and passage 4 pairs of small area analysis is higher, and the measuring accuracy of passage 1 and passage 2 pairs of big current is higher.
Described current-limiting circuit comprises current-limiting resistor network unshakable in one's determination, folder current-limiting resistor network and pilot relay, current-limiting resistor network unshakable in one's determination and folder current-limiting resistor network connection control relay, folder current-limiting resistor network is provided with clamp earthing current input end and clamp earthing current output terminal, current-limiting resistor network unshakable in one's determination is provided with iron core grounding current input terminal and iron core grounding current output terminal, and pilot relay connects the KONGZHI_K1-K10 wiring pin of master chip circuit.
Technique effect of the present utility model is:
(1) two-way monitoring, two-way current limliting
The transformer of unshakable in one's determination and folder being drawn respectively to the external ground wire of fuel tank carries out real-time two-way ground current on-line monitoring, when there is multipoint earthing situation, is convenient to analysis of failure position.As measure folder to vagabond current be I1 and unshakable in one's determination be I2 to vagabond current, can tentatively judge accordingly: as I1=I2, and numerical value is when number peace is above, upper yoke has multipoint earthing; When I2 is far longer than I1, I2 numerical value is when number peace is above, and lower yoke has multipoint earthing; When I1 is far longer than I2, I1 numerical value is when number peace is above, and folder touches case shell.According to abort situation, current limliting is distinguished to unshakable in one's determination, folder ground wire simultaneously.
(2) big current range, pin-point accuracy
The utility model current range can reach 1mA ~ 30A, considers various multipoint earthing situation, achieves gamut and covers, guarantee that the data that on-line monitoring arrives are accurate to fault current.
(3) open-close type current transformer is adopted to install.
The internal diameter size of the external current transformer that the utility model is used is 20mm × 85mm, is particularly suitable for the place of band steel ground connection, meets different transformer grade completely, the in-site installation of different iron core, folder earthing mode.What adopt due to the external current transformer of native system is can open-close ways, so carry out substation field when installing, transformer does not need to stop transport, and can install, need not dismantle tested ground wire under running state of transformer.This greatly facilitates the popularization of on-line monitoring system, can not by the restriction of time, avoids because transformer is stopped transport the economic loss brought, make in the future Site Detection and safeguard safer, facilitate.
(4) there are GPRS, RS485, IEC61850 tri-kinds of communication modes.
(5) system has on-the-spot sound and light alarm, telecommunication warning, relay node report to the police three kinds of overload alarm modes.
In a word, can simultaneously to unshakable in one's determination and clamp earthing current is monitored and current limliting.High-performance opening and closing type current transformer and multi channel currents metering circuit ensure that ground current measurement range large (1mA ~ 30A), accuracy is high ± (1%+5mA).The installation of on-line monitoring unit does not change wiring, the ground connection pattern of original power equipment, can not cause any interference and impact to primary system.Realize Real-Time Monitoring, greatly reduce the input of human and material resources, and ensure that the ageing of data.Analysis for running state of transformer provides data supporting and basis for estimation.By paying close attention to its critical conditions, determine whether that needs overhaul, can the conversion of trouble saving state effectively, reduce or avoid the loss that transformer fault development brings, improve the safe reliability that transformer runs.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present utility model.
Fig. 2 is control panel wiring diagram described in the utility model.
Fig. 3 is A/D metering circuit wiring diagram described in the utility model.
Fig. 4 is E2 storer wiring diagram described in the utility model.
Fig. 5 is master chip circuit interconnect pattern described in the utility model.
Fig. 6 is display circuit wiring diagram described in the utility model.
Fig. 7 is current-limiting circuit wiring diagram described in the utility model.
Fig. 8 is communicating circuit wiring diagram described in the utility model.
Fig. 9 is warning circuit wiring diagram described in the utility model.
Figure 10 is power supply wiring diagram described in the utility model.
In the drawings 1, power supply 2, control panel 3, A/D metering circuit 4, E2 storer 5, master chip circuit 6, display circuit 7, current-limiting circuit 8, communicating circuit 9, warning circuit 31, rectifying and wave-filtering amplifier LM324 32, steel core current transformer 33, folder current transformer.
Embodiment
For the ease of understanding, below in conjunction with accompanying drawing, the utility model is illustrated further.
As shown in Figure 1, a kind of iron core grounding electric current on-Line Monitor Device, it comprises power supply (1), control panel (2), A/D metering circuit (3), E2 storer (4), master chip circuit (5), display circuit (6), current-limiting circuit (7), communicating circuit (8), warning circuit (9), it is characterized in that power supply (1), control panel (2), A/D metering circuit (3), E2 storer (4), display circuit (6), current-limiting circuit (7), communicating circuit (8), warning circuit (9) are connected with master chip circuit (5) respectively.
As shown in Figure 5, described master chip circuit (5) comprises master chip STM32F107VCT6, and master chip STM32F107VCT6 is provided with the+24V and 0V wiring pin that are connected with power supply (1), the on-line monitoring unshakable in one's determination be connected with control panel (2), automatic current limiting unshakable in one's determination, manual current limliting unshakable in one's determination, folder on-line monitoring, automatic current limiting unshakable in one's determination, manual current limliting wiring pin unshakable in one's determination, the iron core grounding electric current input pin TIEXIN_I be connected with A/D metering circuit (3), clamp earthing current input pin JIAJIAN_I, the E2-CS be connected with E2 storer (4), E2-SI, E2-SO, E2-SCK wiring pin, the LCD-BUSY be connected with display circuit (6), LCD-DOUT, LCD-DIN wiring pin, the KONGZHI_K1-K10 wiring pin be connected with current-limiting circuit (7), the RS232-RX be connected with communicating circuit (8), RS232-TX, RS4851-RX, RS4851-TX, RS4851-CON, RS232-TX, RS4852-RX, RS4852-TX, RS4852-CON, the TIEXIN_ALARM wiring pin be connected with warning circuit (9), JIAJIAN_ALARM wiring pin.
As shown in Figure 10, described power supply (1) is HAT200-24H24-NFCI Switching Power Supply, and input end connects air switch, and output terminal connects master chip circuit (5).
As shown in Figure 2, described control panel (2) comprise control on-line monitoring unshakable in one's determination, automatic current limiting unshakable in one's determination, manual current limliting unshakable in one's determination a cutter three throw waver 1, waver 2 thrown by one cutter three of control folder on-line monitoring, automatic current limiting unshakable in one's determination, manual current limliting unshakable in one's determination, current-limiting resistance gear rising touch key unshakable in one's determination, the decline of current-limiting resistance gear touch key, folder current-limiting resistance gear rising touch key and folder current-limiting resistance gear decline touch key unshakable in one's determination.
As shown in Figure 3; described A/D metering circuit (3) comprises steel core current transformer (32) and folder current transformer (33); steel core current transformer (32) connects a rectifying and wave-filtering amplifier LM324(31), then connect the iron core grounding electric current input pin TIEXIN_I of master chip circuit (5); Folder current transformer (33) connects another rectifying and wave-filtering amplifier LM324(31), then connect the clamp earthing current input pin JIAJIAN_I of master chip circuit (5).Steel core current transformer (32) and folder current transformer (33) adopt open-close type current transformer.Open-close type current transformer adopts up-to-date CT technology, multilayer screen technology, hardly by the impact of external magnetic field, has waterproof, anti-rain, drip-proof function simultaneously, ensure that high precision, high stability, the high reliability of long-term free of discontinuities on-line monitoring.
Described master chip STM32F107VCT6 inner integrated simulation amount input pin PA11, the iron core grounding electric current input pin TIEXIN_I of PA12 and A/D metering circuit, clamp earthing current input pin JIAJIAN_I.PA11 pin is connected with two signal sampling channels (passage 1, passage 2) of master chip STM32F107VCT6 inside A/D module again, when steel core current value is less than 100mA, final current value equals the value of passage 1, and when steel core current value is greater than 100mA, final current value equals the value of passage 2.PA12 pin is connected with two signal sampling channels (passage 3, passage 4) of master chip STM32F107VCT6 inside A/D module again, when folder current value is less than 100mA, final current value equals the value of passage 3, and when folder current value is greater than 100mA, final current value equals the value of passage 4.Realize 12 A/D samplings to iron core grounding electric current, clamp earthing current.The measuring accuracy of passage 3 and passage 4 pairs of small area analysis is higher, and the measuring accuracy of passage 1 and passage 2 pairs of big current is higher.
As shown in Figure 4, described E2 storer (4) is FM25L512 type E2 storer, it is provided with E2-CS, E2-SI, E2-SO, E2-SCK pin, PB2, PB1, PB3, PB0 pin using master chip STM32F107VCT6 kernel integrated SPI1 mouth respectively with CS, SI, SO, SCK pin signal wiring of E2 storer.Arranging SPI1 mouth is the main mode of operation of full duplex, realizes the data transmission that speed is 500KB/S.The 64k byte space of E2 storer is utilized to store AD calibration factor and 2000 historical records.。
As shown in Figure 6, described display circuit (6) is DMT32240T057 lattice lcd, be provided with LCD-BUSY, LCD-DOUT, LCD-DIN pin, PC14, PC15 pin using master chip circuit (5) inner integrated USART2 mouth respectively with LCD-DIN, LCD-DOUT pin signal wiring of Liquid Crystal Module, PC13 is configured to open circuit input mode and Liquid Crystal Module LCD-BUSY pin signal wiring.The half-duplex state that USART2 mouth is 9600 baud rates, 8 data bit, 1 position of rest, no parity check position is set.Realize real-time refreshing that is unshakable in one's determination, clamp earthing current value to show and the inquiry of historical data display.
As shown in Figure 7, described current-limiting circuit (7) comprises current-limiting resistor network unshakable in one's determination, folder current-limiting resistor network and pilot relay, current-limiting resistor network unshakable in one's determination and folder current-limiting resistor network connection control relay, folder current-limiting resistor network is provided with clamp earthing current input end and clamp earthing current output terminal, current-limiting resistor network unshakable in one's determination is provided with iron core grounding current input terminal and iron core grounding current output terminal, and pilot relay connects the KONGZHI_K1-K10 wiring pin of master chip circuit (5).
As shown in Figure 8, described communicating circuit (8) comprises the RS232 circuit of MAX3232 type and the RS485 circuit of two MAX3485 types, be provided with RS232-RX, RS232-TX pin of RS232 circuit, RS4851-RX, RS4851-TX, RS4851-CON, RS232-TX, RS4852-RX, RS4852-TX, RS4852-CON pin of RS485 circuit, they are connected with master chip circuit (5).
As shown in Figure 9, described warning circuit (9) comprises display lamp unshakable in one's determination warning, the warning of buzzer warning unshakable in one's determination, alarm relay unshakable in one's determination, folder display lamp, folder buzzer warning, folder alarm relay, display lamp warning unshakable in one's determination, buzzer warning unshakable in one's determination, alarm relay unshakable in one's determination connect TIEXIN_ALARM wiring pin, and the warning of folder display lamp, folder buzzer warning, folder alarm relay connect JIAJIAN_ALARM wiring pin.
Claims (9)
1. an iron core grounding electric current on-Line Monitor Device, comprise power supply, control panel, A/D metering circuit, E2 storer, master chip circuit, display circuit, current-limiting circuit, communicating circuit, warning circuit, it is characterized in that power supply, control panel, A/D metering circuit, E2 storer, display circuit, current-limiting circuit, communicating circuit, warning circuit are connected with master chip circuit respectively.
2. iron core grounding electric current on-Line Monitor Device according to claim 1, is characterized in that described master chip circuit comprises master chip STM32F107VCT6.
3. iron core grounding electric current on-Line Monitor Device according to claim 2; it is characterized in that described A/D metering circuit comprises steel core current transformer and folder current transformer; steel core current transformer connects a rectifying and wave-filtering amplifier LM324, then connects the iron core grounding electric current input pin TIEXIN_I of master chip circuit; Folder current transformer connects another rectifying and wave-filtering amplifier LM324, then connects the clamp earthing current input pin JIAJIAN_I of master chip circuit.
4. iron core grounding electric current on-Line Monitor Device according to claim 3, is characterized in that described power supply is HAT200-24H24-NFCI Switching Power Supply, and input end connects air switch, and output terminal connects master chip circuit.
5. iron core grounding electric current on-Line Monitor Device according to claim 3, it is characterized in that described control panel comprise control on-line monitoring unshakable in one's determination, automatic current limiting unshakable in one's determination, manual current limliting unshakable in one's determination a cutter three throw waver 1, waver 2 thrown by one cutter three of control folder on-line monitoring, automatic current limiting unshakable in one's determination, manual current limliting unshakable in one's determination, current-limiting resistance gear rising touch key unshakable in one's determination, the decline of current-limiting resistance gear touch key, folder current-limiting resistance gear rising touch key and folder current-limiting resistance gear decline touch key unshakable in one's determination.
6. iron core grounding electric current on-Line Monitor Device according to claim 3, it is characterized in that described current-limiting circuit comprises current-limiting resistor network unshakable in one's determination, folder current-limiting resistor network and pilot relay, current-limiting resistor network unshakable in one's determination and folder current-limiting resistor network connection control relay, folder current-limiting resistor network is provided with clamp earthing current input end and clamp earthing current output terminal, current-limiting resistor network unshakable in one's determination is provided with iron core grounding current input terminal and iron core grounding current output terminal, and pilot relay connects the KONGZHI_K1-K10 wiring pin of master chip circuit.
7. iron core grounding electric current on-Line Monitor Device according to claim 3, it is characterized in that described communicating circuit comprises the RS232 circuit of MAX3232 type and the RS485 circuit of two MAX3485 types, be provided with RS232-RX, RS232-TX pin of RS232 circuit, RS4851-RX, RS4851-TX, RS4851-CON, RS232-TX, RS4852-RX, RS4852-TX, RS4852-CON pin of RS485 circuit, they are connected with master chip circuit.
8. iron core grounding electric current on-Line Monitor Device according to claim 3, it is characterized in that described warning circuit comprises display lamp unshakable in one's determination warning, the warning of buzzer warning unshakable in one's determination, alarm relay unshakable in one's determination, folder display lamp, folder buzzer warning, folder alarm relay, display lamp warning unshakable in one's determination, buzzer warning unshakable in one's determination, alarm relay unshakable in one's determination connect TIEXIN_ALARM wiring pin, and the warning of folder display lamp, folder buzzer warning, folder alarm relay connect JIAJIAN_ALARM wiring pin.
9. iron core grounding electric current on-Line Monitor Device according to claim 3, is characterized in that steel core current transformer and folder current transformer adopt open-close type current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420692402.8U CN204116526U (en) | 2014-11-18 | 2014-11-18 | Iron core grounding electric current on-Line Monitor Device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420692402.8U CN204116526U (en) | 2014-11-18 | 2014-11-18 | Iron core grounding electric current on-Line Monitor Device |
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| Publication Number | Publication Date |
|---|---|
| CN204116526U true CN204116526U (en) | 2015-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420692402.8U Expired - Fee Related CN204116526U (en) | 2014-11-18 | 2014-11-18 | Iron core grounding electric current on-Line Monitor Device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316824A (en) * | 2014-11-18 | 2015-01-28 | 国家电网公司 | On-line iron core grounding current monitoring device |
| CN106961159A (en) * | 2017-04-28 | 2017-07-18 | 重庆大学 | A kind of earth current energy storage and recoverying and utilizing method |
-
2014
- 2014-11-18 CN CN201420692402.8U patent/CN204116526U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316824A (en) * | 2014-11-18 | 2015-01-28 | 国家电网公司 | On-line iron core grounding current monitoring device |
| CN106961159A (en) * | 2017-04-28 | 2017-07-18 | 重庆大学 | A kind of earth current energy storage and recoverying and utilizing method |
| CN106961159B (en) * | 2017-04-28 | 2019-07-12 | 重庆大学 | A kind of earth current energy storage and recoverying and utilizing method |
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