CN112202180B - Full compensation system compensation transformer voltage division ratio design method based on fault phase residual voltage - Google Patents
Full compensation system compensation transformer voltage division ratio design method based on fault phase residual voltage Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
- H02M5/12—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers for conversion of voltage or current amplitude only
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Abstract
The application provides a design method of a full compensation system compensation transformer voltage division ratio based on fault phase residual voltage, which comprises the following steps: presetting a maximum allowable residual voltage value of a ground fault current compensation system of a self-generated power phase power supply; when the connection groups of the phase power supply generator and the phase power supply phase compensator are DY, the maximum grounding resistance of the grounding fault current compensation system for self-generating power supply phase power supply in single-phase grounding is obtained; acquiring no-load voltage of the voltage regulating transformer based on the maximum allowable residual voltage value and the maximum grounding resistance; acquiring a reference transformation ratio of the regulating transformer based on the no-load voltage of the regulating transformer; the level difference of the step-down transformer is determined based on the reference transformation ratio of the step-down transformer. The method can effectively reduce the production and manufacturing cost of the compensation transformer, avoid the problem of unqualified design in engineering application, be an important theoretical basis for the design of the full compensation system, and greatly improve the compensation precision due to the optimized design of the voltage division ratio of the compensation transformer.
Description
Technical Field
The application relates to the technical field of power system distribution network compensation, in particular to a design method for the voltage division ratio of a full compensation system compensation transformer based on fault phase residual voltage.
Background
The single-phase ground fault of the power distribution network at home and abroad accounts for more than 80%, the safe operation of the power grid and equipment is seriously influenced, and the safe treatment of the ground fault plays an important role in social and economic development. When the capacitance current of the system is more than 10A, an arc suppression coil grounding mode is adopted. The arc suppression coil can reduce fault current to a certain extent, the system can operate for 2 hours with faults, but the arc suppression coil can not realize full compensation, residual current smaller than 10A still exists at a fault point, and the existence of the residual current can cause personal electric shock and fire accidents and seriously threaten the safe and stable operation of a power grid and equipment. When the capacitance current of the system is larger, a small-resistance grounding mode is adopted, when a single-phase grounding fault occurs, the zero sequence current of the fault line is amplified, and the relay protection device rapidly cuts off the fault line, but the power supply reliability of the grounding mode is difficult to ensure, and the risk of relay protection refusing action exists when high-resistance grounding exists.
In order to thoroughly eliminate the damage of single-phase grounding faults and ensure the reliability of power supply, a plurality of methods for completely compensating the current of the single-phase grounding fault points are proposed at home and abroad. For example: GFN (ground fault neutralizer) manufactured by sweden swedish, which is represented by a power electronic active power source, is used to realize the full compensation of the ground fault, and a method (CN 102074950 a) for extinguishing and protecting the ground fault of the power distribution network is also active full compensation in technical principle. On the other hand, there is also a system and a method for compensating the ground fault current of self-generated electric phase power (CN 201910992110.3, CN201910992109.0, etc.), which have advantages in terms of cost and stability because of the utilization of a phase-to-power converter and the absence of a power electronic power source. When the compensating system utilizes the voltage regulating transformer to carry out grounding compensation adjustment, the transformation ratio of the transformer can influence the output voltage of grounding compensation, thereby influencing the compensating effect of the system.
The prior patent analysis methods (CN 202010081976.1 and CN 202010081977.6) for voltage drop of a full compensation system, the patent compensation adjustment method (application number CN 202010081967.2) for the self-generated power supply ground fault compensation system and the like provide rated transformation ratio calculation methods, but the influence of residual voltage is not considered in design, only the rated transformation ratio is provided, the partial pressure ratio change introduced by residual voltage control is not considered, and the accurate control of the single-phase ground fault residual voltage of the power distribution system cannot be realized. Therefore, the prior art does not have basic theory and calculation method for designing the voltage division ratio of the full compensation system voltage regulating transformer, the production and manufacturing cost of the compensation transformer is not easy to control, the problem of unqualified design in engineering application often occurs, the compensation precision is greatly reduced, and the manufacturing cost is increased.
Disclosure of Invention
The application provides a design method for the voltage division ratio of a full compensation system compensation transformer based on fault phase residual voltage, which aims to solve the problem of low compensation effect in the prior art.
In order to solve the technical problems, the embodiment of the application discloses the following technical scheme:
the application provides a design method of a full compensation system compensation transformer voltage division ratio based on fault phase residual voltage, wherein the design method is applied to a ground fault current compensation system of a self-generated power supply phase power supply, and the ground fault current compensation system of the self-generated power supply phase power supply comprises the following components: the switching device comprises a line-phase converter, a switching switch, a controller and a regulating transformer, wherein the line-phase converter comprises a phase power supply generator and a phase power supply phase compensator, and the regulating transformer does not contain an arc suppression coil; the method comprises the following steps:
presetting a maximum allowable residual voltage value of a ground fault current compensation system of the self-generated power phase power supply;
when the connection groups of the phase power supply generator and the phase power supply phase compensator are DY, obtaining the maximum grounding resistance of the grounding fault current compensation system of the self-generated power supply phase power supply when the phase power supply generator and the phase power supply phase compensator are in single-phase connection;
acquiring no-load voltage of the regulating transformer based on the maximum allowable residual voltage value and the maximum grounding resistance;
acquiring a reference transformation ratio of the regulating transformer based on the no-load voltage of the regulating transformer;
and determining the level difference of the regulating transformer based on the reference transformation ratio of the regulating transformer.
Optionally, the setting range of the maximum allowable residual voltage value of the ground fault current compensation system of the self-generated power supply is 0-200V.
Optionally, the obtaining the maximum ground resistance of the ground fault current compensation system of the self-generated electric phase power supply when the ground fault current compensation system is in single-phase connection comprises:
a nominal parameter of a ground fault current compensation system obtained from a generated electrical phase power source, the nominal parameter comprising: three-phase rated phase voltage and single relative admittance;
calculating the maximum ground resistance when the single phase is grounded:
wherein:
the three-phase rated phase voltage of the ground fault current compensation system for the self-generated power phase power supply;
a single phase to ground admittance of a ground fault current compensation system for a self-generated electrical phase source;
the inverse of the maximum grounding resistance when the single-phase grounding of the grounding fault current compensation system of the self-generated power supply is carried out;
abs represents the modulo function.
Optionally, the acquiring the no-load voltage of the voltage regulating transformer based on the maximum allowable residual voltage value and the maximum ground resistance includes:
wherein:
is the no-load voltage of the regulating transformer;
U c is the maximum allowable residual pressure value;is the single relative admittance; />Equivalent admittance for self-generated power supply;
is the reciprocal of the maximum ground resistance; abs represents a modulo function;
the rated phase voltage of the system is compensated for the ground fault current of the self-generated electrical phase power supply.
Optionally, the obtaining the reference transformation ratio of the step-down transformer based on the no-load voltage of the step-down transformer includes:
a nominal parameter of a ground fault current compensation system obtained from a generated electrical phase power source, the nominal parameter comprising: the voltage transformation ratio of the phase power supply generator, the voltage transformation ratio of the phase compensator of the phase power supply, the primary side equivalent impedance of the line-phase converter and the primary side equivalent impedance of the voltage regulating transformer;
calculating a reference transformation ratio of the voltage regulating transformer:
wherein:
k org the reference transformation ratio is the reference transformation ratio of the voltage regulating transformer;
m is the voltage transformation ratio of the phase power supply generator, and n is the voltage transformation ratio of the phase power supply phase compensator;
Z E ground distributed capacitance impedance of a ground fault current compensation system for a self-generated electrical phase power supply;
is the primary side equivalent impedance of the line-phase converter;
is the primary side equivalent impedance of the regulating transformer;
is the primary side equivalent impedance of the regulating transformer.
Optionally, the determining the level difference of the step-down transformer based on the reference transformation ratio of the step-down transformer includes:
wherein:
U step is the level difference of the voltage regulating transformer;
rated phase voltage for the primary side of the regulating transformer; k (k) org The reference transformation ratio is the reference transformation ratio of the voltage regulating transformer;
m is the voltage transformation ratio of the phase power supply generator, and n is the voltage transformation ratio of the phase power supply phase compensator;
abs is a modulo function.
Compared with the prior art, the beneficial effects of this application are:
the application provides a design method of a full compensation system compensation transformer voltage division ratio based on fault phase residual voltage, which comprises the following steps: presetting a maximum allowable residual voltage value of a ground fault current compensation system of a self-generated power phase power supply; when the connection groups of the phase power supply generator and the phase power supply phase compensator are DY, the maximum grounding resistance of the grounding fault current compensation system for self-generating power supply phase power supply in single-phase grounding is obtained; acquiring no-load voltage of the voltage regulating transformer based on the maximum allowable residual voltage value and the maximum grounding resistance; acquiring a reference transformation ratio of the regulating transformer based on the no-load voltage of the regulating transformer; the level difference of the step-down transformer is determined based on the reference transformation ratio of the step-down transformer. The invention provides a design method of the voltage division ratio of the full compensation system voltage regulating transformer considering the residual voltage of the ground fault phase, which provides a theoretical basis and a calculation method for the design of the voltage division ratio of the independent full compensation system voltage regulating transformer.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a general flow chart of a design method of a full compensation system compensation transformer voltage division ratio based on fault phase residual voltage provided by the embodiment of the invention;
fig. 2 is a schematic structural diagram of a ground fault current compensation system for a self-generated phase power supply according to an embodiment of the present invention.
Detailed Description
In order to better understand the technical solutions in the present application, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
Referring to fig. 1, an overall flow chart of a design method of a voltage division ratio of a compensation transformer of a full compensation system based on fault phase residual voltage is provided in an embodiment of the invention. As shown in fig. 1, the method comprises the steps of:
s1, presetting a maximum allowable residual voltage value of a ground fault current compensation system of the self-generated power supply;
s2, when the connection groups of the phase power supply generator and the phase power supply phase compensator are DY, obtaining the maximum grounding resistance of the grounding fault current compensation system of the self-generated power supply phase power supply when the single-phase grounding is carried out;
s3, acquiring no-load voltage of the voltage regulating transformer based on the maximum allowable residual voltage value and the maximum grounding resistance;
s4, acquiring a reference transformation ratio of the voltage regulating transformer based on the no-load voltage of the voltage regulating transformer;
s5, determining the level difference of the voltage regulating transformer based on the reference transformation ratio of the voltage regulating transformer.
It should be noted that, the design method of the voltage division ratio of the full compensation system compensation transformer based on the residual voltage of the fault phase provided by the embodiment of the invention is applied to the ground fault current compensation system of the self-generated power supply, and the ground fault current compensation system of the self-generated power supply is in the prior art.
Specifically, as shown in fig. 2, a schematic structure diagram of a ground fault current compensation system for a self-generated power supply is shown in an embodiment of the present invention.
The earth fault current compensation system of the self-generated phase power supply comprises: a line-phase converter, a switching switch 3, a controller 4 and a regulating transformer 5. The input end of the line-phase converter is connected with the bus, and the output end of the line-phase converter is connected with the switching switch 3; the switching switch 3 is connected with the input end of the voltage regulating transformer 5, and the output end of the voltage regulating transformer 5 is connected with the neutral point of the system. The line-to-phase converter comprises a phase power supply generator 1 and a phase power supply phase compensator 2. The regulating transformer 5 does not include an arc suppression coil.
The following describes the steps in detail:
in step S1, a maximum allowable residual voltage value of the ground fault current compensation system of the self-generated electric phase power supply is preset.
Specifically, in order to ensure personal safety, in the embodiment of the invention, the maximum allowable residual voltage value of the ground fault current compensation system of the self-generated power supply phase power supply is set to be 0-200V.
In step S2, when the coupling groups of the phase power supply generator and the phase power supply phase compensator are DY, the maximum ground resistance of the ground fault current compensation system for self-generated power supply phase power supply in single-phase grounding is obtained.
It should be noted that, in the embodiment of the present invention, the connection groups of the phase power supply generator and the phase power supply phase compensator are all in DY connection.
Specifically, step S2 includes the steps of:
s201, obtaining rated parameters of a ground fault current compensation system of a self-generated power phase power supply, wherein the rated parameters comprise: three-phase rated phase voltages and single relative admittance.
Specifically, the source of data for the nominal parameters of the system is well known to those skilled in the art.
S202, calculating the maximum grounding resistance when the single-phase grounding is performed. The calculation formula is as follows:
wherein:
the three-phase rated phase voltage of the ground fault current compensation system for the self-generated power phase power supply;
a single phase to ground admittance of a ground fault current compensation system for a self-generated electrical phase source;
the inverse of the maximum grounding resistance when the single-phase grounding of the grounding fault current compensation system of the self-generated power supply is carried out;
abs represents the modulo function.
In step S3, the no-load voltage of the step-down transformer is obtained based on the maximum allowable residual voltage value and the maximum ground resistance.
Specifically, the rated parameters of the ground fault current compensation system obtained from the generated electric phase power supply first include: self-generated power supply equivalent admittance.
And calculating the no-load voltage of the regulating transformer, wherein the calculation formula is as follows:
wherein:
is the no-load voltage of the regulating transformer;
U c is the maximum allowable residual pressure value;as single relative admittance；/>Equivalent admittance for self-generated power supply;
is the reciprocal of the maximum ground resistance; abs represents a modulo function;
the rated phase voltage of the system is compensated for the ground fault current of the self-generated electrical phase power supply.
In step S4, a reference transformation ratio of the step-up transformer is obtained based on the no-load voltage of the step-up transformer.
Specifically, step S4 includes the steps of:
s401, obtaining rated parameters of a ground fault current compensation system of a self-generated power phase power supply, wherein the rated parameters comprise: the voltage transformation ratio of the phase power supply generator, the voltage transformation ratio of the phase compensator of the phase power supply, the primary side equivalent impedance of the line-to-phase converter and the primary side equivalent impedance of the voltage regulating transformer.
S402, calculating a reference transformation ratio of the voltage regulating transformer, wherein the calculation formula is as follows:
wherein:
k org the reference transformation ratio is the reference transformation ratio of the voltage regulating transformer;
m is the voltage transformation ratio of the phase power supply generator, and n is the voltage transformation ratio of the phase power supply phase compensator;
Z E distributing capacitive impedance for the system to ground;
is the primary side equivalent impedance of the line-phase converter;
is the primary side equivalent impedance of the regulating transformer;
is the primary side equivalent impedance of the regulating transformer.
In step S5, the level difference of the step-down transformer is determined based on the reference transformation ratio of the step-down transformer.
Specifically, first, the primary-side rated phase voltage of the regulating transformer is obtained. And then determining the level difference of the regulating transformer, wherein the calculation formula is as follows:
wherein:
U step is the level difference of the voltage regulating transformer;
rated phase voltage for the primary side of the regulating transformer; k (k) org The reference transformation ratio is the reference transformation ratio of the voltage regulating transformer;
m is the voltage transformation ratio of the phase power supply generator, and n is the voltage transformation ratio of the phase power supply phase compensator;
abs is a modulo function.
In one embodiment of the present invention, the present method is described in terms of specific examples.
Specifically, the maximum allowable residual pressure value of the system is firstly determined as U C ＝100V。
A nominal parameter of a ground fault current compensation system obtained from a generated electrical phase power supply, comprising: the system single relative distributed capacitance was 1.5uF, the system single relative admittancePhase power supply generationThe capacity of the device is 200kVA, the short-circuit impedance is 4%, the voltage transformation ratio is 10kV/10kV, and the primary side equivalent reactance of a phase power supply generator is +.>The capacity of the phase compensator of the phase power supply is 200kVA, the short-circuit impedance is 4%, the voltage transformation ratio is 10kV/10kV, and the equivalent reactance of the primary side of the phase compensator of the phase power supply is +.>The capacity of the regulating transformer is 60kVA, the rated voltage of the primary side is 5.773kV, the short-circuit impedance is 4%, and the equivalent reactance of the primary side of the regulating transformer is +.>Equivalent admittance calculated from self-generated power supply to neutral point>Is-0.0197 jS.
And according to the calculation, the maximum grounding resistance value of the single-phase grounding of the system is 1493 omega.
And calculating the idle voltage of the voltage regulating transformer to 5508V under the conditions of maximum allowable residual voltage and maximum grounding resistance according to an idle voltage calculation formula. Calculating reference transformation ratio k of the compensation voltage regulating transformer according to the full compensation transformation ratio formula org 1.073.
And determining the level difference of the ground compensation regulating transformer to be 256V according to the voltage regulator transformation ratio and the level difference determining method.
In summary, compared with the prior art, the method has the following beneficial effects:
the embodiment of the application presets the maximum allowable residual voltage value of the ground fault current compensation system of the self-generated power supply; when the connection groups of the phase power supply generator and the phase power supply phase compensator are DY, the maximum grounding resistance of the grounding fault current compensation system for self-generating power supply phase power supply in single-phase grounding is obtained; acquiring no-load voltage of the voltage regulating transformer based on the maximum allowable residual voltage value and the maximum grounding resistance; acquiring a reference transformation ratio of the regulating transformer based on the no-load voltage of the regulating transformer; the level difference of the step-down transformer is determined based on the reference transformation ratio of the step-down transformer. The invention provides a design method of the voltage division ratio of the full compensation system voltage regulating transformer considering the residual voltage of the ground fault phase, which provides a theoretical basis and a calculation method for the design of the voltage division ratio of the independent full compensation system voltage regulating transformer.
It should be noted that in this specification, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such circuit structure, article, or apparatus. Without further limitation, the statement "comprises an" or "comprising" does not exclude that an additional identical element is present in a circuit structure, article or apparatus that comprises the element.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure of the invention herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims. The above-described embodiments of the present application are not intended to limit the scope of the present application.
Claims (3)
1. The design method is applied to a ground fault current compensation system of a self-generated power supply, and the ground fault current compensation system of the self-generated power supply comprises the following steps: the switching device comprises a line-phase converter, a switching switch, a controller and a regulating transformer, wherein the line-phase converter comprises a phase power supply generator and a phase power supply phase compensator, and the regulating transformer does not contain an arc suppression coil; the method comprises the following steps:
presetting a maximum allowable residual voltage value of a ground fault current compensation system of the self-generated power phase power supply;
when the connection groups of the phase power supply generator and the phase power supply phase compensator are DY, obtaining the maximum grounding resistance of the grounding fault current compensation system of the self-generated power supply phase power supply when the phase power supply generator and the phase power supply phase compensator are in single-phase connection;
acquiring no-load voltage of the regulating transformer based on the maximum allowable residual voltage value and the maximum grounding resistance;
acquiring a reference transformation ratio of the regulating transformer based on the no-load voltage of the regulating transformer;
determining a step of the step-down transformer based on a reference transformation ratio of the step-down transformer;
the obtaining the no-load voltage of the voltage regulating transformer based on the maximum allowable residual voltage value and the maximum grounding resistance comprises the following steps:
wherein:
is the no-load voltage of the regulating transformer;
U c is the maximum allowable residual pressure value;is the single relative admittance; />Equivalent admittance for self-generated power supply;
is the reciprocal of the maximum ground resistance; abs represents a modulo function;
the rated phase voltage of the ground fault current compensation system for the self-generated power phase power supply;
the step of obtaining the reference transformation ratio of the step-down transformer based on the no-load voltage of the step-down transformer comprises the following steps:
a nominal parameter of a ground fault current compensation system obtained from a generated electrical phase power source, the nominal parameter comprising: the voltage transformation ratio of the phase power supply generator, the voltage transformation ratio of the phase compensator of the phase power supply, the primary side equivalent impedance of the line-phase converter and the primary side equivalent impedance of the voltage regulating transformer;
calculating a reference transformation ratio of the voltage regulating transformer:
wherein:
k org the reference transformation ratio is the reference transformation ratio of the voltage regulating transformer;
m is the voltage transformation ratio of the phase power supply generator, and n is the voltage transformation ratio of the phase power supply phase compensator;
Z E ground distributed capacitance impedance of a ground fault current compensation system for a self-generated electrical phase power supply;
is the primary side equivalent impedance of the line-phase converter;
primary side equivalent impedance of a phase compensator for a phase power supply;
is the primary side equivalent impedance of the regulating transformer;
the step of determining the step of the step-down transformer based on the reference transformation ratio of the step-down transformer comprises the following steps:
wherein:
U step is the level difference of the voltage regulating transformer;
rated phase voltage for the primary side of the regulating transformer; k (k) org The reference transformation ratio is the reference transformation ratio of the voltage regulating transformer;
m is the voltage transformation ratio of the phase power supply generator, and n is the voltage transformation ratio of the phase power supply phase compensator;
abs is a modulo function.
2. The design method according to claim 1, wherein the maximum allowable residual voltage value of the ground fault current compensation system of the self-generated electric phase power source is set to be in a range of 0-200V.
3. The design method according to claim 1, wherein the obtaining the maximum ground resistance of the ground fault current compensation system of the self-generated electric phase power supply at the single-phase ground comprises:
a nominal parameter of a ground fault current compensation system obtained from a generated electrical phase power source, the nominal parameter comprising: three-phase rated phase voltage and single relative admittance;
calculating the maximum ground resistance when the single phase is grounded:
wherein:
the three-phase rated phase voltage of the ground fault current compensation system for the self-generated power phase power supply;
a single phase to ground admittance of a ground fault current compensation system for a self-generated electrical phase source;
the inverse of the maximum grounding resistance when the single-phase grounding of the grounding fault current compensation system of the self-generated power supply is carried out;
abs represents the modulo function.
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