CN105510731B - Power transformer medium voltage side power grid parallel resonance detects alarm method and system - Google Patents

Power transformer medium voltage side power grid parallel resonance detects alarm method and system Download PDF

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Publication number
CN105510731B
CN105510731B CN201510832383.3A CN201510832383A CN105510731B CN 105510731 B CN105510731 B CN 105510731B CN 201510832383 A CN201510832383 A CN 201510832383A CN 105510731 B CN105510731 B CN 105510731B
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voltage side
transformer
medium voltage
parallel resonance
neutral point
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CN105510731A (en
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石文江
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State Grid Corp of China SGCC
State Grid Liaoning Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Liaoning Electric Power Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere

Abstract

The present invention relates to a kind of power transformer medium voltage side power grid parallel resonance detection alarm method and the data such as system, voltage, electric current by detecting transformer privileged site, alerted after carrying out logical operation.Method and system provided by the invention, solves the problems, such as the detection alarm of YNyn0d11 power transformer medium voltage side power grid parallel resonances, it is detected and alarm process is simple, quick, reliable, can be widely applied to the occasions such as power scheduling control centre, substation.No longer mutually obscure with single-phase earthing, single-phase wire break accident in judgement the invention enables parallel resonance failure, the process instruction so as to avoid regulation and control person's erroneous judgement and send mistake is delayed accident treatment.

Description

Power transformer medium voltage side power grid parallel resonance detects alarm method and system
Technical field
The present invention relates to the detection alarm method and system of a kind of electric network fault, particularly a kind of YNyn0d11 power transformers Device medium voltage side power grid parallel resonance detects alarm method and system.
Background technology
At home in electric system, the typical group mode of connection of YNyn0d11 power transformers is:Main transformer is on high-tension side Neutral earthing devices are made of discharging gap, grounding switch, ground resistance, are mainly used for preventing main transformer high-pressure side neutral point mistake The path of voltage and offer high-pressure side zero-sequence current over the ground;Main transformer medium voltage side neutral point is grounded through arc suppression coil device, arc blowout wire Coil apparatus is mainly made of controllable impedance, damping resistance, bypass contactor, is mainly used for connect single-phase to the capacitive of medium voltage side power grid Earth fault provides inductive compensation electric current, so as to reduce the short circuit current flow of earth point, therefore event is allowed under singlephase earth fault Barrier circuit continue to run with 2 it is small when, be conducive to improve power grid power supply reliability;Main transformer low-pressure side does not connect load generally, main to use In offsetting a part of zero-sequence current, be conducive to the safe operation of main transformer.YNyn0d11 main transformers are in 220kV, 110kV voltage class Using quite varied in power grid, its medium voltage side power grid is exactly typical small current neutral grounding system, in system under external interference Ferromagnetic type voltage transformer may produce Parallel connection ferroresonance with system direct-to-ground capacitance, and resonance accident quickly grows, is destructive Greatly, it is therefore desirable to which quick processing, otherwise easily causes large area blackout, but the presentation of resonance accident and single-phase earthing, list Phase line-outage contingency is much like, this is easy to cause regulation and control person's erroneous judgement and sends the instructions such as line walking processing, and then delays at accident Reason.At present, still not fast and effectively for the in parallel humorous of YNyn0d11 group mode of connection power transformer medium voltage side power grids Shake detection alarm method.
The content of the invention
It is an object of the invention to solve problems of the prior art, there is provided a kind of power transformer medium voltage side power grid Parallel resonance detects alarm method and system.
The object of the present invention is achieved like this:A kind of power transformer medium voltage side power grid parallel resonance detects alarm side Method, it is characterised in that this method includes herein below:
A. transformer medium voltage side neutral point voltage data, setting electricity are gathered by data sampling and processing, out-of-limit comparison means Limit value is pressed when voltage exceeds limit value, " to be pressed in the range of 50V--200V to parallel resonance logic judgment device transmission in transformer Side neutral point voltage exceeds limit value " logic true value, otherwise transmits falsity;
B. by the identical other transformer medium voltage sides of voltage class in data sampling and processing, out-of-limit comparison means acquisition station Property point voltage, setting voltage limits in the range of 10V--50V, when voltage exceed limit value, to parallel resonance logic judgment device biography " the identical other transformer medium voltage side neutral point voltages of voltage class exceed limit value in standing " logic true value is passed, otherwise transmits falsity;
C. high-pressure side mother or segmentation position data are gathered by data acquisition processing device, when main transformer high-pressure side connects mother The mother or fragment bit of line, which are set to, closes position, or more main transformer high-pressure sides are connected using single busbar, are filled to parallel resonance logic judgment Transmission " position is closed in high-pressure side mother or segmentation " logic true value is put, otherwise transmits falsity;
D. medium voltage side mother or segmentation position data are gathered by data acquisition processing device, when main transformer medium voltage side connects mother When the mother or fragment bit of line are set to point position, patrolled to parallel resonance logic judgment device transmission " medium voltage side mother or segmentation point position " True value is collected, otherwise transmits falsity;
E. high voltage side of transformer neutral point current, setting electric current limit are gathered by data sampling and processing, out-of-limit comparison means Value is in the range of 5A--100A, and when electric current exceeds limit value, to the transmission of parallel resonance logic judgment device, " high voltage side of transformer is neutral Point electric current exceeds limit value " otherwise logic true value is falsity;
F. parallel resonance logic judgment device receives the logic true value of " position is closed in high-pressure side mother or segmentation ", " medium voltage side Mother divides position " logic true value, " in standing the identical other transformer medium voltage side neutral point voltages of voltage class beyond limit After the logic true value of value ", the logic true value of " transformer medium voltage side neutral point voltage exceeds limit value ", sent to alarm output device Parallel resonance alarm starts;Parallel resonance logic judgment device receives " high voltage side of transformer neutral point current exceeds limit value " and patrols After collecting true value and " transformer medium voltage side neutral point voltage exceeds limit value " logic true value, parallel resonance is sent to alarm output device Alarm starts;
G. after alarm output device receives alarm startup, outputting alarm information.
The signal source of the collection transformer medium voltage side neutral point voltage data is Secondary Circuit of Potential Transformer or/and change Power station measure and control device real time data or/and scheduling station real time data.
The signal source of the identical other transformer medium voltage side neutral point voltage data of voltage class is voltage in the acquisition station Transformer secondary circuit or/and transformer station measurement and control device real time data or/and substation's background computer real time data or/and scheduling master Stand real time data.
The collection high-pressure side mother or the signal source for being segmented position data are switch auxiliary contact secondary circuit or/and change Power station measure and control device real time data or/and substation's background computer real time data or/and scheduling station real time data.
The collection medium voltage side mother or the signal source for being segmented position data are switch auxiliary contact secondary circuit or/and change Power station measure and control device real time data or/and substation's background computer real time data or/and scheduling station real time data.
Become high-pressure side neutral point current mutual inductor two based on the signal source of the collection high voltage side of transformer neutral point current Minor loop or/and transformer station measurement and control device real time data or/and substation's background computer real time data or/and scheduling station count in real time According to.
The mode that the data sampling and processing device transmits data to parallel resonance logic judgment device is communication message Or/and memory variable or/and shared file.
The parallel resonance logic judgment device sends the mode of information as communication message or/and interior to alarm output device Deposit variable or/and shared file.
The mode of the alarm output device outputting alarm information transmits for a distant place or/and host alerts window or/and sound equipment Or/and warning light or/and short message or/and mail.
A kind of power transformer medium voltage side power grid parallel resonance detects warning system, it is characterised in that it is by being arranged on power transformation Stand transformer medium voltage side neutral point voltage collection in the measure and control device of integrated automatic monitoring system, processing, out-of-limit relatively mould Block, stand in the other transformer medium voltage side neutral point voltage collections of identical voltage class, processing, out-of-limit comparison module, high-pressure side it is female Connection or segmentation position acquisition processing module, medium voltage side mother or segmentation position acquisition processing module, high voltage side of transformer neutral point Current acquisition, processing, out-of-limit comparison module, parallel resonance logic judgment module, and it is arranged on integrated automation of transformation stations prison Transformer medium voltage side in the background computer and scheduling station of control system corresponds to busbar parallel resonance alarm output module composition, its In, the collection of transformer medium voltage side neutral point voltage, processing, out-of-limit comparison module, stand in the identical other transformers of voltage class Press the collection of side neutral point voltage, processing, out-of-limit comparison module, high-pressure side mother or segmentation position acquisition processing module, medium voltage side Mother or segmentation position acquisition processing module, high voltage side of transformer neutral point current collection, processing, out-of-limit comparison module respectively with Parallel resonance logic judgment module communicates to connect;The busbar parallel connection corresponding with transformer medium voltage side of parallel resonance logic judgment module is humorous Alarm output of shaking module communicates to connect.
Method and system provided by the invention, solves the inspection of YNyn0d11 power transformer medium voltage side power grid parallel resonances Alarm problem is surveyed, it is detected and alarm process is simple, quick, reliable, can be widely applied to power scheduling control centre, power transformation The occasion such as stand.No longer mutually obscure with single-phase earthing, single-phase wire break accident in judgement the invention enables parallel resonance failure, so that The process instruction delay accident treatment of mistake can be sent to avoid regulation and control person's erroneous judgement.
Brief description of the drawings
Fig. 1 is the method schematic block diagram of the present invention;
Fig. 2 is the system architecture diagram of the present invention;
Fig. 3 is the embodiment reference chart that the present invention is used in substation.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings:
As shown in Figure 1:2 logics are included at least in parallel resonance logic judgment module:A. when in transformer medium voltage side Property point voltage exceeds limit value(Voltage out-of-limit 1)Exceed limit value with high voltage side of transformer neutral point current(Electric current out-of-limit 3)When, judge As a result it is true value;B. when in station the other transformer medium voltage side neutral point voltages of identical voltage class exceed limit value(Voltage out-of-limit 2) It is set to high-pressure side mother or fragment bit and closes position or high-voltage side bus and be set to point for single busbar and medium voltage side mother or fragment bit During position, judging result is true value.As long as it is true value that 2 logics of the above, which have 1, parallel resonance logic judgment device outputting alarm is believed Number.
It is mutual that transformer medium voltage side neutral point voltage is gathered, handled, the voltage signal source of out-of-limit comparison module may be derived from voltage The secondary circuit of sensor, transformer station measurement and control device real time data, substation's background computer real time data, scheduling station real time data At least one, voltage out-of-limit definite value can in the range of 50V to 200V value, during voltage out-of-limit, transformer medium voltage side neutral point electricity Pressure collection, processing, out-of-limit comparison module are otherwise false to out-of-limit 1 logic true value of parallel resonance logic judgment module transfer overvoltage Value, the mode of intelligence transmission can be communication message, memory variable, at least one of shared file.
The identical other transformer medium voltage side neutral point voltages of voltage class are gathered, handled, the electricity of out-of-limit comparison module in standing Pressure signal source may be derived from the secondary circuit of voltage transformer, transformer station measurement and control device real time data, substation's background computer and count in real time According at least one of, scheduling station real time data, voltage out-of-limit definite value can in the range of 10V to 50V value, during voltage out-of-limit, The identical other transformer medium voltage side neutral point voltages of voltage class are gathered, handled in standing, out-of-limit comparison module is patrolled to parallel resonance Out-of-limit 2 logic true value of judgment module transfer overvoltage is collected, otherwise transmits falsity, the mode of intelligence transmission can be communication message, memory At least one of variable, shared file.
The position signal source of high-pressure side mother or segmentation position acquisition processing module may be derived from the secondary of switch auxiliary contact Circuit, transformer station measurement and control device real time data, substation's background computer real time data, at least one of scheduling station real time data, When main transformer high-pressure side connects the mother of busbar or fragment bit is set to conjunction position, or more main transformer high-pressure sides are connected using single busbar, High-pressure side mother or segmentation position acquisition processing module transmit high-pressure side mother or segmentation conjunction to parallel resonance logic judgment module The logic true value of position, otherwise transmits falsity, the mode of intelligence transmission can be communication message, memory variable, shared file at least It is a kind of.
The position signal source of medium voltage side mother or segmentation position acquisition processing module may be derived from the secondary of switch auxiliary contact Circuit, transformer station measurement and control device real time data, substation's background computer real time data, at least one of scheduling station real time data, When main transformer medium voltage side connects the mother of busbar or fragment bit is set to point position, medium voltage side mother or segmentation position acquisition processing module Medium voltage side mother is transmitted to parallel resonance logic judgment module or divides the logic true value of position, otherwise transmits falsity, and information passes The mode of passing can be communication message, memory variable, at least one of shared file.
The collection of high voltage side of transformer neutral point current, processing, the current signal source of out-of-limit comparison module may be derived from main transformer height Press secondary circuit, transformer station measurement and control device real time data, substation's background computer real time data, the tune of side neutral point current mutual inductor Spend at least one of main website real time data, electric current get over limit value can in the range of 5A to 100A value, when main transformer high-pressure side is neutral Point electric current is more prescribed a time limit, and is transmitted the out-of-limit true value of electric current to parallel resonance logic judgment module, is otherwise transmitted falsity, the mode of intelligence transmission Can be communication message, memory variable, at least one of shared file.
Parallel resonance logic judgment module receives high-pressure side mother or segmentation close the logic true value of position, medium voltage side mother or After dividing the logic true value of the logic true value of position, the logic true value of voltage out-of-limit 2, voltage out-of-limit 1, to transformer medium voltage side pair Busbar parallel resonance alarm output module is answered to send alarm output logic true value;Parallel resonance logic judgment module receives electric current After 1 logic true value of out-of-limit 3 logic true value and voltage out-of-limit, medium voltage side busbar parallel resonance alarm output module is corresponded to transformer Parallel resonance alarm is sent to start.Outputting alarm does not start other situations.The transfer mode that alarm starts can be communication report Text, memory variable, at least one of shared file.
Transformer medium voltage side corresponds to busbar parallel resonance alarm output module and receives outputting alarm information after alarm starts, The mode of warning information performance can be that a distant place transmits, host alerts window, accident signal, warning light, short message, at least the one of mail Kind.
The principle of institute's foundation of the present invention is:When YNyn0d11 power transformer medium voltage side ferromagnetic type voltage transformer inductance with When parallel resonance occurs for system single-phase direct-to-ground capacitance, single-phase busbar voltage is very high, but loop current very little, therefore arc suppression coil Overvoltage compensation and harmonic elimination effect very little to parallel resonance, this necessarily causes the single-phase winding output potential of transformer medium voltage side Rise, the single-phase busbar voltage of three-phase is seriously unbalanced during due to resonance, and the neutral point of main transformer medium voltage side can produce very big Residual voltage 3U0, the 3U0 can be measured by medium voltage side busbar voltage.On the other hand, parallel resonance overvoltage can pass through main transformer High-pressure side winding influences on high-tension side busbar voltage, therefore the on high-tension side neutral point of main transformer can produce larger zero-sequence current 3I0.For there is the substation of more main transformer paired runnings, the parallel resonance that a main transformer medium voltage side occurs can also pass through high-pressure side Busbar influences adjacent main transformer, the neutral point of adjacent main transformer medium voltage side larger 3U0 residual voltages is also occurred, and single-phase connects The power grid accidents such as the series resonance that ground, single-phase wire break, arc suppression coil participate in are not in then in main transformer high-pressure side and adjacent main transformer The neutral point of side is pressed the phenomenon of larger voltage and current occur.
As shown in Fig. 2, the measure and control device of the present embodiment including integrated automation of transformation stations monitoring system, master control device, after Platform machine and scheduling station.Implemented function such as in measure and control device:The collection of transformer medium voltage side neutral point voltage, handle, be out-of-limit Comparison module, stand in the other transformer medium voltage side neutral point voltages collections of identical voltage class, processing, out-of-limit comparison module, it is high Press side mother or segmentation position acquisition processing module, medium voltage side mother or segmentation position acquisition processing module, high voltage side of transformer Neutral point current collection, processing, out-of-limit comparison module, parallel resonance logic judgment module;Platform machine and scheduling station in the rear In realize that transformer medium voltage side corresponds to busbar parallel resonance alarm output module.
As shown in figure 3, in the present embodiment substation 2 main transformers(#1、#2)The YNyn0d11 group modes of connection are used, 5 220kV intervals be respectively 220kV inlet wires 1,220kV inlet wires 2, #1 main transformers master once, #2 main transformers master once, 220kV segmentation, 3 Bar 220kV busbares are 220kVI sections of busbares, 220kVII sections of busbares, 220kV hospital bus bars respectively, 2 220kV voltage transformers It is PT, 220kVII sections of busbar PT of 220kVI sections of busbares respectively, 5 66kV intervals are 66kV outlets 1,66kV outlets 2, #1 respectively Main transformer master is secondary, #2 main transformer masters are secondary, 66kV mothers, and 2 66kV voltage transformers are mother 66kVI PT, 66kVII mother PT respectively.
The collection of transformer medium voltage side neutral point voltage, processing, out-of-limit comparison module and the identical other changes of voltage class in station The collection of depressor medium voltage side neutral point voltage, processing, out-of-limit comparison module sample mother 66kVI 3U0 voltages and mother 66kVII 3U0 at the same time Voltage, i.e. #1 main transformers medium voltage side neutral point voltage and #2 main transformer medium voltage side neutral point voltage 3U0 voltage out-of-limit definite values are set to 2, The main transformer medium voltage side of 70V and 10V, 3U0 voltage more than 70V joins the busbar that 66kV busbares are judged to parallel resonance generation, by becoming Depressor medium voltage side neutral point voltage collection, processing, out-of-limit comparison module send " logic true value of voltage out-of-limit 1 " TRUE to parallel connection it is humorous Shake logic judgment module, main transformer medium voltage side of the 3U0 voltages between 10V to 70V joins 66kV busbares for adjacent adjoint resonance mother Line, " electricity is sent by the other transformer medium voltage side neutral point voltage collections of identical voltage class in station, processing, out-of-limit comparison module Press out-of-limit 2 " logic true value TRUE to parallel resonance logic judgment module, mother 66kVI 3U0 voltages and mother 66kVII 3U0 voltages by Screen introduces measure and control device to 66kV voltages by cable side by side, when 3U0 voltages are not prescribed a time limit more, " voltage out-of-limit 1 " and " voltage out-of-limit 2 " be false value FALSE.
High-pressure side mother or segmentation position acquisition processing module sampling are led to from 220kV block switch mechanism case auxiliary contacts Cross cable access 220kV block switch position signals, when position is being closed in 220kV block switches position, high-pressure side mother or divide Fragment position acquisition processing module sends " position is closed in high-pressure side mother or segmentation " logic true value to parallel resonance logic judgment module TRUE, is otherwise false value FALSE.
Medium voltage side mother or segmentation position acquisition processing module sampling are led to from 66kV bus connection switch mechanism case auxiliary contacts Cross the 66kV bus connection switch position signals of cable access, when position is being closed in 66kV bus connection switches position, medium voltage side mother or segmentation Station acquisition processing module sends " medium voltage side mother or segmentation point position " logic true value TRUE to parallel resonance logic judgment module, Otherwise it is false value FALSE.
The collection of high voltage side of transformer neutral point current, processing, the sampling of out-of-limit comparison module are neutral from #1 main transformers high-pressure side The zero-sequence current 3I0 that point CT casings are accessed by cable, out-of-limit fixed value adjusting are 10A, when 3I0 is more than 10A, by transformer height The collection of pressure side neutral point current, processing, out-of-limit comparison module send " electric current out-of-limit 3 " to the parallel resonance logic judgment module Logic true value TRUE, is otherwise false value FALSE.
Parallel resonance logic judgment module is to " the logical value of voltage out-of-limit 1 " and " the out-of-limit 3 " logical value of electric current is patrolled Volume and computing, as a result for true value when carry out resonance busbar alarm start;Parallel resonance logic judgment module is to " voltage out-of-limit 1 " Logical value, " logical value of voltage out-of-limit 2 ", " position is closed in high-pressure side mother or segmentation " logical value, " medium voltage side mother divides position " Logical value carries out logic and operation, as a result starts to carry out the alarm of resonance busbar during true value;Parallel resonance described in other situations Logic judgment module starts without alarm.
Alarm Starting mode in the present embodiment sends resonance for measure and control device and alerts network message, and background computer receives humorous Shake alarm network message after call transformer medium voltage side corresponds to busbar parallel resonance alarm output module carry out alert window show simultaneously Alerted with accident signal;Master control device is advised after receiving resonance alarm network message to scheduling station transmission resonance alarm telemechanical About message, scheduling station call transformer medium voltage side to correspond to busbar parallel resonance announcement after receiving resonance alarm Telecontrol Protocol message Alert output module carries out alarm window and shows and alerted with accident signal.

Claims (8)

1. a kind of power transformer medium voltage side power grid parallel resonance detects alarm method, it is characterised in that this method is included in following Hold:
A. transformer medium voltage side neutral point voltage data, setting voltage limit are gathered by data sampling and processing, out-of-limit comparison means Value is in the range of 50V--200V, when voltage exceeds limit value, to parallel resonance logic judgment device transmission " in transformer medium voltage side Property point voltage exceeds limit value " logic true value, otherwise transmits falsity;
B. by the identical other transformer medium voltage side neutral points of voltage class in data sampling and processing, out-of-limit comparison means acquisition station Voltage, setting voltage limits are in the range of 10V--50V, when voltage exceeds limit value, to parallel resonance logic judgment device transmission " the identical other transformer medium voltage side neutral point voltages of voltage class exceed limit value in standing " logic true value, otherwise transmits falsity;
C. high-pressure side mother or segmentation position data are gathered by data acquisition processing device, when main transformer high-pressure side connects busbar Mother or fragment bit, which are set to, closes position, or more main transformer high-pressure sides are connected using single busbar, are passed to parallel resonance logic judgment device " position is closed in high-pressure side mother or segmentation " logic true value is passed, otherwise transmits falsity;
D. medium voltage side mother or segmentation position data are gathered by data acquisition processing device, when main transformer medium voltage side connects busbar When mother or fragment bit are set to point position, to the transmission of parallel resonance logic judgment device " medium voltage side mother divides position " logical truth Value, otherwise transmits falsity;
E. high voltage side of transformer neutral point current is gathered by data sampling and processing, out-of-limit comparison means, setting electric current limit value exists In the range of 5A--100A, when electric current exceeds limit value, to parallel resonance logic judgment device transmission " high voltage side of transformer neutral point electricity Stream exceeds limit value " otherwise logic true value is falsity;
F. parallel resonance logic judgment device receives the logic true value of " position is closed in high-pressure side mother or segmentation ", " medium voltage side mother Or divide position " logic true value, " the identical other transformer medium voltage side neutral point voltages of voltage class exceed limit value in standing " Logic true value, " transformer medium voltage side neutral point voltage exceeds limit value " logic true value after, send parallel connection to alarm output device Resonance alarm starts;Parallel resonance logic judgment device receives " high voltage side of transformer neutral point current exceeds limit value " logical truth After value and " transformer medium voltage side neutral point voltage exceeds limit value " logic true value, parallel resonance alarm is sent to alarm output device Start;
G. after alarm output device receives alarm startup, outputting alarm information.
2. a kind of power transformer medium voltage side power grid parallel resonance detection alarm method according to claim 1, its feature The signal source for being the transformer medium voltage side neutral point voltage data is Secondary Circuit of Potential Transformer or/and substation's observing and controlling Device real time data or/and scheduling station real time data.
3. a kind of power transformer medium voltage side power grid parallel resonance detection alarm method according to claim 1, its feature The signal source for being the identical other transformer medium voltage side neutral point voltage data of voltage class in the station is voltage transformer two Minor loop or/and transformer station measurement and control device real time data or/and substation's background computer real time data or/and scheduling station count in real time According to.
4. a kind of power transformer medium voltage side power grid parallel resonance detection alarm method according to claim 1, its feature The signal source for being the high-pressure side mother or being segmented position data and medium voltage side mother or segmentation position data is switch auxiliary Contact secondary circuit or/and transformer station measurement and control device real time data or/and substation's background computer real time data or/and scheduling station Real time data.
5. a kind of power transformer medium voltage side power grid parallel resonance detection alarm method according to claim 1, its feature Be to become based on the signal source of the high voltage side of transformer neutral point current high-pressure side neutral point current transformer secondary circuit or/ With transformer station measurement and control device real time data or/and substation's background computer real time data or/and scheduling station real time data.
6. a kind of power transformer medium voltage side power grid parallel resonance detection alarm method according to claim 1, its feature It is the data sampling and processing, out-of-limit comparison means transmits data to parallel resonance logic judgment device and parallel resonance is patrolled It is communication message or/and memory variable or/and shared file to collect the mode that judgment means send information to alarm output device.
7. a kind of power transformer medium voltage side power grid parallel resonance detection alarm method according to claim 1, its feature Be the mode of the alarm output device outputting alarm information transmitted for a distant place or/and host alert window or/and sound equipment or/and Warning light or/and short message or/and mail.
8. a kind of power transformer medium voltage side power grid parallel resonance detects warning system, it is characterised in that it is by being arranged on substation The collection of transformer medium voltage side neutral point voltage, processing, out-of-limit comparison module in the measure and control device of integrated automatic monitoring system, Other transformer medium voltage side neutral point voltage collections of identical voltage class in standing, processing, out-of-limit comparison module, high-pressure side mother or It is segmented position acquisition processing module, medium voltage side mother or segmentation position acquisition processing module, high voltage side of transformer neutral point current Collection, processing, out-of-limit comparison module, parallel resonance logic judgment module, and it is arranged on integrated automation of transformation stations monitoring system Transformer medium voltage side in the background computer and scheduling station of system corresponds to busbar parallel resonance alarm output module composition, wherein, become The collection of depressor medium voltage side neutral point voltage, processing, out-of-limit comparison module, stand in the identical other transformer medium voltage sides of voltage class Property point voltage acquisition, processing, out-of-limit comparison module, high-pressure side mother or segmentation position acquisition processing module, medium voltage side mother or Be segmented position acquisition processing module, high voltage side of transformer neutral point current collection, processing, out-of-limit comparison module respectively with it is in parallel humorous Logic judgment module of shaking communicates to connect;The busbar parallel resonance alarm corresponding with transformer medium voltage side of parallel resonance logic judgment module Output module communicates to connect.
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