CN104407265A - Method and device for monitoring line defect in bus differential protection current analog quantity of transformer substation - Google Patents
Method and device for monitoring line defect in bus differential protection current analog quantity of transformer substation Download PDFInfo
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- 230000007935 neutral effect Effects 0.000 claims abstract description 32
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- 238000012423 maintenance Methods 0.000 abstract description 6
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Abstract
The invention provides a transformer substation bus differential protection current analog quantity neutral defect monitoring device which is matched with a system comprising N branch neutral lines which are converged at a common N terminal and then are commonly grounded; this monitoring devices has N +1, sets up respectively on N branch road neutral conductor and public earth line, includes: the first end and the second end of the current transformer are positioned on the currently connected line to induce current; the intermediate relay is provided with a normally open contact, one end of the intermediate relay is connected with the third end of the current transformer, and the induced current value is compared with a preset current threshold value to control the current working state of the normally open contact; and the alarm module is connected with the other end of the normally open contact and is started and sends an alarm signal when the normally open contact is closed. By implementing the embodiment of the invention, multipoint grounding of the bus differential protection current secondary circuit of the transformer substation can be found in time, and quick maintenance by maintenance personnel is facilitated, so that the phenomena of misoperation of bus differential protection of the transformer substation when an outside fault occurs and operation failure of the bus differential protection of the transformer substation when an inside fault occurs are avoided.
Description
Technical field
The present invention relates to technical field of power systems, particularly relate to a kind of transformer station bus differential protection current-mode analog quantity center line defect inspection method and apparatus.
Background technology
Transformer station's bus differential protection is the important system equipment ensureing power network safety operation, and its security, reliability, sensitivity and rapidity are to ensureing that the safety of whole regional power grid has decisive meaning.By bus, differential greatly and the little differential of several sections of buses forms transformer station's bus differential protection.Bus is differential is greatly by branch current phasor all on the bus except mother and section switch and the difference element formed, for distinguishing in bus district or external short-circuit.Bus little differential be the difference element be made up of each branch current be connected with current bus, comprising the mother relevant to current bus and section switch branch current, for distinguishing in current bus district or external area error.When bus generation external area error, the electric current now bus flowed in all Connection Elements is equal with the electric current of outflow, and the large difference element of bus and each section of little difference element of bus are all failure to actuate; When bus generating region internal fault, all elements be connected with bus all supply short-circuit current to bus-bar fault point, the little difference element action of the large difference element of bus and place, trouble spot bus, realize selectivity tripping operation.
In order to prevent working the mischief to secondary device and personal safety during insulation damages between current transformer first and second, usually need the necessary ground connection of secondary loop of mutual inductor.Due in substation bus bar differential protection, more transformer station's bus differential protection electric current secondary loop is linked together by the secondary circuit organizing current transformer to form, if there is electrical link between the secondary circuit of each group current transformer, then there is two or more earth point once electric current secondary loop, portion of electrical current will be caused in the earth shunting after-current secondary circuit to occur extra electric current, current transformer load is increased, thus it is even saturated to cause current transformer error to increase, occur that false protection or misaction occur, therefore transformer station's bus differential protection electric current secondary loop has and can only have an earth point.
As shown in Figure 1; for the one point grounding mode that transformer station's bus differential protection electric current secondary loop in prior art is conventional; detailed process is caused by the one point earth line of each electric current secondary loop on the same secondary earth mat ground connection bronze medal in screen in differential relaying panel, adopts bolt fixedly to realize one point earth.It is to be noted; the way of secondary earth mat ground connection bronze medal that bus differential protection electric current secondary loop one point earth is fixed in screen by a ground wire after adopting each grounding point to be connected in series in early days is worthless; because of when middle serial connection link or total earth point loosen, some or all electric current secondary loop may be caused to lose ground connection or there is no good earth point.
When adopting proper grounding mode as shown in Figure 1, although the drawback of one point earth after avoiding serial connection, but its shortcoming is: when electric current secondary loop is because of control cables insulation damages, when the reasons such as secondary wiring of current mutual inductor box water inlet cause it to occur other earth point except normal ground point, then because substation ground network exists larger epd, interference may be produced (as shunting appears in transformer station's bus differential protection electric current secondary loop to transformer station's bus differential protection electric current secondary loop, the neutral line produces extra poor stream, aggravation Current Transformer Secondary is saturated), make the malfunction when external area error of transformer station's bus differential protection, tripping during troubles inside the sample space, cause serious consequence.Therefore, Timeliness coverage transformer station bus differential protection electric current secondary loop multipoint earthing in normal operation, so that it is very necessary that operation maintenance personnel processes in time.
Summary of the invention
Embodiment of the present invention technical matters to be solved is; a kind of transformer station bus differential protection current-mode analog quantity center line defect inspection method and apparatus is provided; can Timeliness coverage transformer station bus differential protection electric current secondary loop multipoint earthing; be conducive to maintainer's Fast-Maintenance, thus avoid the phenomenon of transformer station's bus differential protection tripping when malfunction and troubles inside the sample space when external area error to occur.
In order to solve the problems of the technologies described above, embodiments provide a kind of transformer station bus differential protection current-mode analog quantity center line defect inspection device, its with comprise the N bar branch road neutral line, the described N bar branch road neutral line is after a public N terminal tandem, and the system realizing one point earth by a common ground line matches; Wherein, described monitoring device has N+1, makes the described N bar branch road neutral line and described common ground line are provided with a described monitoring device; N is positive integer;
Described monitoring device comprises:
A current transformer, its first end and the second end are all positioned on current connected circuit, for responding to the current value that described current institute's line road is flow through in real time;
An auxiliary reclay, it comprises a normally opened contact, one end of described normally opened contact is connected with the 3rd end of described current transformer, current value for being responded in real time by described current transformer compares with the current threshold preset, and controls described normally opened contact current operating state according to comparative result; Wherein, duty comprises closure state and off-state;
An alarm module, it is connected with the other end of the normally opened contact of described auxiliary reclay, for when the normally opened contact current operating state of described auxiliary reclay is closure state, starts and sends alerting signal.
Wherein, described alarm module comprises a two-position relay, described two-position relay is used for when the normally opened contact current operating state of described auxiliary reclay is closure state, the junction closure of described two-position relay, keep described alerting signal to be in running status always, until described two-position relay be reset after its contact disconnect.
Wherein, when the current threshold preset of described auxiliary reclay is less than the current value that described current transformer responds in real time, described auxiliary reclay controls normally opened contact described in it and is in closure state; When the current threshold preset of described auxiliary reclay is greater than the current value that described current transformer responds in real time, described auxiliary reclay controls normally opened contact described in it and is in off-state.
Wherein, the span of described default current threshold is positioned between (30mA, 50mA).
The embodiment of the present invention additionally provides a kind of transformer station bus differential protection current-mode analog quantity center line defect inspection method; it is at aforesaid monitoring device and comprise the N bar branch road neutral line; the described N bar branch road neutral line is after a public N terminal tandem; the system realizing one point earth by a common ground line matches middle realization, and described monitoring method comprises:
By the current value that the current transformer on N+1 described monitoring device simultaneously the N bar branch road neutral line described in Real-time Collection and described common ground line flow through; Wherein, N is positive integer;
The current threshold that the current value responded in real time by current transformer in each monitoring device auxiliary reclay that in same monitoring device be connected corresponding to it is preset compares, and controls the normally opened contact current operating state on each auxiliary reclay according to comparative result; Wherein, duty comprises closure state and off-state;
According to the current operating state of the normally opened contact of each auxiliary reclay described, determine that the alarm module that in same monitoring device be connected corresponding to it starts or disconnect;
When there being at least one alarm module to start, the alarm module got after described startup all sends alerting signal, and the described circuit sending the alarm module place of alerting signal is all defined as earth fault line.
Wherein, described monitoring method comprises further:
When there being at least one alarm module to start, the contact getting the two-position relay in the alarm module after described startup is all closed, the alerting signal that alarm module after described startup is sent all can be in running status always, until described two-position relay be all reset after its correspondence contact disconnect.
Wherein, the described current value responded in real time by current transformer in each monitoring device compares with the current threshold that the auxiliary reclay be connected in its same monitoring device is preset, and the concrete steps of the normally opened contact current operating state controlled on each auxiliary reclay according to comparative result comprise:
When the current value that current transformer in each monitoring device described is responded in real time is all greater than the current threshold that its correspondence auxiliary reclay connected in same monitoring device is preset, the normally opened contact that each auxiliary reclay described all controls its correspondence is in closure state;
When the current value that current transformer in described one or more monitoring device is responded in real time is all less than the current threshold that its correspondence auxiliary reclay connected in same monitoring device is preset, the normally opened contact that described one or more auxiliary reclay all controls its correspondence is in off-state.
Wherein, the span of described default current threshold is positioned between (30mA, 50mA).
Implement the embodiment of the present invention, there is following beneficial effect:
1, in embodiments of the present invention, owing to being provided with a monitoring device on each neutral line and common ground line, and compared with the current threshold of corresponding auxiliary reclay in same monitoring device by the current value that the current transformer induction place circuit in each monitoring device flows through, determine that the circuit auxiliary reclay that to power on when flowing through large starts and makes alarm module send alerting signal, thus transformer station's bus differential protection electric current secondary loop earth fault line can be determined fast and accurately, be conducive to maintainer's Fast-Maintenance, the phenomenon of transformer station's bus differential protection tripping when malfunction and troubles inside the sample space when external area error is avoided to occur,
2, in embodiments of the present invention, because alarm module in each monitoring device has included a two-position relay, this two-position relay can keep alerting signal to be in running status always, until after earth fault eliminating, this two-position relay being carried out reset makes alerting signal stop sending, and is conducive to maintainer gets rid of situation investigation to earth fault line.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, the accompanying drawing obtaining other according to these accompanying drawings still belongs to category of the present invention.
Fig. 1 is the structural representation of transformer station's bus differential protection electric current secondary loop one point grounding mode in prior art;
Transformer station's bus differential protection current-mode analog quantity center line defect inspection application of installation that Fig. 2 provides for the embodiment of the present invention is in the structural representation of neutral return path one point grounding mode;
Fig. 3 is the structural representation of alarm module in Fig. 2;
Fig. 4 is the structural representation that in Fig. 2, branch road N earth fault forms potential difference (PD);
The process flow diagram of transformer station's bus differential protection current-mode analog quantity center line defect inspection method that Fig. 5 provides for the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 2; a kind of transformer station bus differential protection current-mode analog quantity center line defect inspection device provided for the embodiment of the present invention with comprise N bar branch road neutral line a; this N bar branch road neutral line a after a public N terminal tandem, the structural representation that the system realizing one point earth by a common ground line b matches.Should be noted that; the N bar branch road of transformer station's bus differential protection electric current secondary loop all can first access to be had on the branch road support of N terminal; draw N bar branch road neutral line a from this branch road support again, and N bar branch road neutral line a is linked together with the connected mode of the corresponding branch road neutral line a of a terminal by middle conductor by public N terminal.
Monitoring device has N+1, makes N bar branch road neutral line a and common ground line b is provided with a monitoring device; Wherein, N is positive integer.This monitoring device comprises:
A current transformer T, its first end L1 and the second end L2 are all positioned on current connected circuit, for responding to the current value that current institute's line road is flow through in real time;
An auxiliary reclay J, it comprises a normally opened contact J-1, one end of normally opened contact J-1 is connected with the 3rd end L3 of current transformer T, current value for being responded in real time by current transformer T compares with the current threshold preset, and controls normally opened contact J-1 current operating state according to comparative result; Wherein, duty comprises closure state and off-state;
An alarm module B, it is connected with the other end of the normally opened contact J-1 of auxiliary reclay J, for when the normally opened contact J-1 current operating state of middle relay J is closure state, starts and sends alerting signal.
The normally opened contact J-1 of auxiliary reclay J realizes closed action, and need when the current threshold preset of middle relay J is less than the current value that current transformer T responds in real time, auxiliary reclay J could control its normally opened contact J-1 and be in closure state;
The normally opened contact J-1 of auxiliary reclay J realizes disconnecting action or remaining open state, need when the current threshold preset of middle relay J is greater than the current value that current transformer T responds in real time, auxiliary reclay J could control its normally opened contact J-1 and be in off-state.
It should be noted that the span of default current threshold is positioned between (30mA, 50mA), the current threshold therefore preset can select arbitrary numerical value (as 38mA) in this span as default current threshold.
For the ease of safeguarding and investigation earth fault, maintainer is reminded to safeguard in time the circuit of not fixing a breakdown, therefore in each alarm module B, a two-position relay KKJ is provided with, as shown in Figure 3, this two-position relay KKJ is used for when the normally opened contact J-1 current operating state of middle relay J is closure state, the contact KKJ-1 of two-position relay KKJ closes, keep alerting signal to be in running status always, until two-position relay KKJ be reset after the contact KKJ-1 of its correspondence disconnect.
It should be noted that in Fig. 3, KKJ is two-position relay; KKJ-1 is two-position relay contact; R1, R2 are limited piezoresistance, should in distribution voltage; D1, D2 are backward dioded, for extinguishing arc; FA is involution button.
The principle of work of a kind of transformer station bus differential protection current-mode analog quantity center line defect inspection device that the embodiment of the present invention provides is:
When branch road N newly there is an earth point M1 (because the reasons such as insulation damages cause), as shown in Figure 4, the earth point M2 of new earth point M1 and common ground line is made to have potential difference (PD) under the impact of external electric field, thus cause forming current loop between M1 and M2 earth point, therefore the neutral line a of its correspondence there is electric current to flow through.
Particularly when system generation earth fault; earth current will be produced; potential difference (PD) △ U is produced between above-mentioned two earth points; the voltage introducing protection is not the voltage-to-ground U that between above-mentioned two earth points, corresponding neutral line a is real; but the voltage superposed after the potential difference (PD) △ U between above-mentioned two earth points; be designated as U ', formula is as follows:
U’=U+△U （1）
Now, the electric current on branch road N forms loop after the earth point M2 of new earth point M1, N# terminal, inductor N, public N terminal, inductor N+1, common ground line, and inductor N and inductor N+1 can sense electric current simultaneously.When the current value that inductor N and/or inductor N+1 responds to is greater than the current threshold preset in its corresponding auxiliary reclay J, then the auxiliary reclay J startup of its correspondence makes corresponding normally opened contact J-1 close; When the current value that inductor N and/or inductor N+1 responds to is less than the current threshold preset in its corresponding auxiliary reclay J, then the normally opened contact J-1 of the auxiliary reclay J of its correspondence returns, and remains in off-state.
After each auxiliary reclay J startup makes corresponding normally opened contact J-1 closed, as shown in Figure 3, two-position relay KKJ in coupled alarm module B starts, two-position relay KKJ contact KKJ-1 is closed alerting signal is sent, maintainer can understand earth fault in time and accurately to be existed, and in time by overhaul of the equipments, eliminate the defect of the neutral line.Because two-position relay KKJ is guard relay, signal is kept always, until after earth fault eliminating, press involution button FA, make the contact KKJ-1 of two-position relay KKJ disconnect, by signal return.
As shown in Figure 5; for a kind of transformer station bus differential protection current-mode analog quantity center line defect inspection method that the embodiment of the present invention provides; it is at aforesaid monitoring device and comprise the N bar branch road neutral line; the described N bar branch road neutral line is after a public N terminal tandem; the system realizing one point earth by a common ground line matches middle realization, and described monitoring method comprises:
Step S101, current value by the current transformer on N+1 described monitoring device simultaneously the N bar branch road neutral line described in Real-time Collection and described common ground line flow through; Wherein, N is positive integer;
Detailed process is, the N bar branch road neutral line and common ground line are provided with a monitoring device, and the current transformer of each monitoring device is all for gathering the current value that its corresponding line flows through.
The current threshold that step S102, the current value responded in real time by current transformer in each monitoring device auxiliary reclay that in same monitoring device be connected corresponding to it is preset compares, and controls the normally opened contact current operating state on each auxiliary reclay according to comparative result; Wherein, duty comprises closure state and off-state;
Detailed process is, when the current value that current transformer in each monitoring device is responded in real time is all greater than the current threshold that its correspondence auxiliary reclay connected in same monitoring device is preset, the normally opened contact that each auxiliary reclay all controls its correspondence is in closure state;
When the current value that current transformer in one or more monitoring device is responded in real time is all less than the current threshold that its correspondence auxiliary reclay connected in same monitoring device is preset, the normally opened contact that one or more auxiliary reclay all controls its correspondence is in off-state.
Wherein, the span of described default current threshold is positioned between (30mA, 50mA).
Step S103, current operating state according to the normally opened contact of each auxiliary reclay described, determine that the alarm module that in same monitoring device be connected corresponding to it starts or disconnect;
Step S104, when there being at least one alarm module to start, the alarm module got after described startup all sends alerting signal, and the described circuit sending the alarm module place of alerting signal is all defined as earth fault line.
Certainly in order to be conducive to the investigation of maintainer to earth fault line eliminating situation, described monitoring method comprises further:
When there being at least one alarm module to start, the contact getting the two-position relay in the alarm module after described startup is all closed, the alerting signal that alarm module after described startup is sent all can be in running status always, until described two-position relay be all reset after its correspondence contact disconnect.
Implement the embodiment of the present invention, there is following beneficial effect:
1, in embodiments of the present invention, owing to being provided with a monitoring device on each neutral line and common ground line, and compared with the current threshold of corresponding auxiliary reclay in same monitoring device by the current value that the current transformer induction place circuit in each monitoring device flows through, determine that the circuit auxiliary reclay that to power on when flowing through large starts and makes alarm module send alerting signal, thus transformer station's bus differential protection electric current secondary loop earth fault line can be determined fast and accurately, be conducive to maintainer's Fast-Maintenance, the phenomenon of transformer station's bus differential protection tripping when malfunction and troubles inside the sample space when external area error is avoided to occur,
2, in embodiments of the present invention, because alarm module in each monitoring device has included a two-position relay, this two-position relay can keep alerting signal to be in running status always, until after earth fault eliminating, this two-position relay being carried out reset makes alerting signal stop sending, and is conducive to maintainer gets rid of situation investigation to earth fault line.
One of ordinary skill in the art will appreciate that all or part of step realized in above-described embodiment method is that the hardware that can carry out instruction relevant by program has come, described program can be stored in a computer read/write memory medium, described storage medium, as ROM/RAM, disk, CD etc.
Above disclosedly be only a kind of preferred embodiment of the present invention, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (8)
1. transformer station's bus differential protection current-mode analog quantity center line defect inspection device, it is characterized in that, its with comprise the N bar branch road neutral line, the described N bar branch road neutral line is after a public N terminal tandem, and the system realizing one point earth by a common ground line matches; Wherein, described monitoring device has N+1, makes the described N bar branch road neutral line and described common ground line are provided with a described monitoring device; N is positive integer;
Described monitoring device comprises:
A current transformer, its first end and the second end are all positioned on current connected circuit, for responding to the current value that described current institute's line road is flow through in real time;
An auxiliary reclay, it comprises a normally opened contact, one end of described normally opened contact is connected with the 3rd end of described current transformer, current value for being responded in real time by described current transformer compares with the current threshold preset, and controls described normally opened contact current operating state according to comparative result; Wherein, duty comprises closure state and off-state;
An alarm module, it is connected with the other end of the normally opened contact of described auxiliary reclay, for when the normally opened contact current operating state of described auxiliary reclay is closure state, starts and sends alerting signal.
2. monitoring device as claimed in claim 1, it is characterized in that, described alarm module comprises a two-position relay, described two-position relay is used for when the normally opened contact current operating state of described auxiliary reclay is closure state, the junction closure of described two-position relay, keep described alerting signal to be in running status always, until described two-position relay be reset after its contact disconnect.
3. monitoring device as claimed in claim 1, is characterized in that, when the current threshold preset of described auxiliary reclay is less than the current value that described current transformer responds in real time, described auxiliary reclay controls normally opened contact described in it and is in closure state; When the current threshold preset of described auxiliary reclay is greater than the current value that described current transformer responds in real time, described auxiliary reclay controls normally opened contact described in it and is in off-state.
4. the monitoring device as described in claim 1 or 3, is characterized in that, the span of described default current threshold is positioned between (30mA, 50mA).
5. transformer station's bus differential protection current-mode analog quantity center line defect inspection method; it is characterized in that; it is at the monitoring device such as according to any one of Claims 1-4 and comprise the N bar branch road neutral line; the described N bar branch road neutral line is after a public N terminal tandem; the system realizing one point earth by a common ground line matches middle realization, and described monitoring method comprises:
By the current value that the current transformer on N+1 described monitoring device simultaneously the N bar branch road neutral line described in Real-time Collection and described common ground line flow through; Wherein, N is positive integer;
The current threshold that the current value responded in real time by current transformer in each monitoring device auxiliary reclay that in same monitoring device be connected corresponding to it is preset compares, and controls the normally opened contact current operating state on each auxiliary reclay according to comparative result; Wherein, duty comprises closure state and off-state;
According to the current operating state of the normally opened contact of each auxiliary reclay described, determine that the alarm module that in same monitoring device be connected corresponding to it starts or disconnect;
When there being at least one alarm module to start, getting the alarm module after described startup and all can send alerting signal, and the described circuit sending the alarm module place of alerting signal is all defined as earth fault line.
6. monitoring method as claimed in claim 5, it is characterized in that, described monitoring method comprises further:
When there being at least one alarm module to start, the contact getting the two-position relay in the alarm module after described startup is all closed, the alerting signal that alarm module after described startup is sent all can be in running status always, until described two-position relay be all reset after its correspondence contact disconnect.
7. monitoring method as claimed in claim 5, it is characterized in that, the described current value responded in real time by current transformer in each monitoring device compares with the current threshold that the auxiliary reclay be connected in its same monitoring device is preset, and the concrete steps of the normally opened contact current operating state controlled on each auxiliary reclay according to comparative result comprise:
When the current value that current transformer in each monitoring device described is responded in real time is all greater than the current threshold that its correspondence auxiliary reclay connected in same monitoring device is preset, the normally opened contact that each auxiliary reclay described all controls its correspondence is in closure state;
When the current value that current transformer in described one or more monitoring device is responded in real time is all less than the current threshold that its correspondence auxiliary reclay connected in same monitoring device is preset, the normally opened contact that described one or more auxiliary reclay all controls its correspondence is in off-state.
8. the monitoring method as described in claim 5 or 7, is characterized in that, the span of described default current threshold is positioned between (30mA, 50mA).
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Cited By (6)
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| CN105182046A (en) * | 2015-09-25 | 2015-12-23 | 深圳供电局有限公司 | Current-voltage transformer secondary neutral grounding current acquisition device |
| CN105261160A (en) * | 2015-11-23 | 2016-01-20 | 国网辽宁省电力有限公司营口供电公司 | Synthesized alarming system of miniature transformer station |
| CN106291218A (en) * | 2016-09-26 | 2017-01-04 | 深圳供电局有限公司 | Latent fault analysis device for protection analog quantity acquisition loop |
| CN109270397A (en) * | 2018-11-26 | 2019-01-25 | 国网安徽省电力有限公司安庆供电公司 | A kind of direct-current grounding monitoring device |
| CN110426603A (en) * | 2019-08-30 | 2019-11-08 | 广东电网有限责任公司 | A method of detection low-voltage network ground fault and one ground stealing of a line |
| CN111694306A (en) * | 2020-06-15 | 2020-09-22 | 浙江浙能嘉华发电有限公司 | CT secondary circuit multipoint grounding on-line monitoring device and monitoring method thereof |
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| CN105182046A (en) * | 2015-09-25 | 2015-12-23 | 深圳供电局有限公司 | Current-voltage transformer secondary neutral grounding current acquisition device |
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| CN109270397A (en) * | 2018-11-26 | 2019-01-25 | 国网安徽省电力有限公司安庆供电公司 | A kind of direct-current grounding monitoring device |
| CN109270397B (en) * | 2018-11-26 | 2024-10-15 | 国网安徽省电力有限公司安庆供电公司 | DC grounding monitoring device |
| CN110426603A (en) * | 2019-08-30 | 2019-11-08 | 广东电网有限责任公司 | A method of detection low-voltage network ground fault and one ground stealing of a line |
| CN111694306A (en) * | 2020-06-15 | 2020-09-22 | 浙江浙能嘉华发电有限公司 | CT secondary circuit multipoint grounding on-line monitoring device and monitoring method thereof |
| CN111694306B (en) * | 2020-06-15 | 2021-10-22 | 浙江浙能嘉华发电有限公司 | CT secondary circuit multipoint grounding on-line monitoring device and monitoring method thereof |
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Application publication date: 20150311 |