RU98104600A - METHOD FOR CONTROL OF RESISTANCE OF INSULATION AND PROTECTION OF ELECTRIC NETWORK - Google Patents

METHOD FOR CONTROL OF RESISTANCE OF INSULATION AND PROTECTION OF ELECTRIC NETWORK

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Publication number
RU98104600A
RU98104600A RU98104600/09A RU98104600A RU98104600A RU 98104600 A RU98104600 A RU 98104600A RU 98104600/09 A RU98104600/09 A RU 98104600/09A RU 98104600 A RU98104600 A RU 98104600A RU 98104600 A RU98104600 A RU 98104600A
Authority
RU
Russia
Prior art keywords
resistance
insulation
leakage current
protection
control
Prior art date
Application number
RU98104600/09A
Other languages
Russian (ru)
Other versions
RU2144679C1 (en
Inventor
С.И. Малафеев
В.С. Мамай
Н.А. Серебренников
В.Г. Фролкин
Original Assignee
Владимирский государственный университет
Filing date
Publication date
Application filed by Владимирский государственный университет filed Critical Владимирский государственный университет
Priority to RU98104600A priority Critical patent/RU2144679C1/en
Priority claimed from RU98104600A external-priority patent/RU2144679C1/en
Publication of RU98104600A publication Critical patent/RU98104600A/en
Application granted granted Critical
Publication of RU2144679C1 publication Critical patent/RU2144679C1/en

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Claims (1)

Способ контроля сопротивления изоляции и защиты электрической сети, основанный на измерении тока утечки от вспомогательного источника измерительного напряжения, отличающийся тем, что дополнительно формируют измерительное напряжение в форме периодической последовательности импульсов вида
Figure 00000001

где U(t) - измерительное напряжение;
U1, U2 - постоянные напряжения, U1>U2;
τ - временной интервал;
Т - период питающей электрической сети; τ<T;
измеряют ток утечки I1 в интервале времени T<t≅2T и ток утечки I2 в интервале 3T<t≅4T путем интегрирования падения напряжения на эталонном сопротивлении за период питающей сети, вычисляют сопротивление изоляции по формуле
Figure 00000002

где rT - внутреннее сопротивление источника, сравнивают полученное значение с двумя уставками R1 и R2, R1<R2, при rиз≅R1 повторяют измерения n1 раз, а при R1<rиз≅R2 повторяют измерения n2 раз (n1≅n2), и при последовательном подтверждении факта снижения сопротивления изоляции n1 или n2 раз производят отключение сети.A method of monitoring the insulation resistance and protecting the electrical network, based on measuring the leakage current from an auxiliary source of measuring voltage, characterized in that they additionally form a measuring voltage in the form of a periodic sequence of pulses of the form
Figure 00000001

where U (t) is the measuring voltage;
U 1 , U 2 - constant voltage, U 1 > U 2 ;
τ is the time interval;
T is the period of the power supply network; τ <T;
measure the leakage current I 1 in the time interval T <t≅2T and the leakage current I 2 in the interval 3T <t≅4T by integrating the voltage drop across the reference resistance for the period of the supply network, calculate the insulation resistance by the formula
Figure 00000002

where r T is the internal resistance of the source, compare the obtained value with the two settings R 1 and R 2 , R 1 <R 2 , when r from ≅R 1 repeat measurements n 1 times, and when R 1 <r from ≅R 2 repeat the measurements n 2 times (n 1 ≅n 2 ), and upon successive confirmation of the fact that the insulation resistance decreases n 1 or n 2 times, the network is disconnected.
RU98104600A 1998-02-20 1998-02-20 Procedure testing resistance of insulation and protection of electric network RU2144679C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RU98104600A RU2144679C1 (en) 1998-02-20 1998-02-20 Procedure testing resistance of insulation and protection of electric network

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
RU98104600A RU2144679C1 (en) 1998-02-20 1998-02-20 Procedure testing resistance of insulation and protection of electric network

Publications (2)

Publication Number Publication Date
RU98104600A true RU98104600A (en) 2000-01-10
RU2144679C1 RU2144679C1 (en) 2000-01-20

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Family Applications (1)

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RU (1) RU2144679C1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2556332C1 (en) * 2014-03-18 2015-07-10 Государственное казённое образовательное учреждение высшего профессионального образования "Российская таможенная академия" Leakage current monitor in load of single-phase rectifier
RU2690087C1 (en) * 2018-08-22 2019-05-30 Рязанова Наталия Евгеньевна Control method of industrial objects electric heating system
RU2725898C1 (en) * 2020-01-27 2020-07-07 Сергей Иванович Малафеев Method of monitoring insulation resistance in an electrical network with insulated neutral
RU2732790C1 (en) * 2020-02-10 2020-09-22 Сергей Иванович Малафеев Insulation resistance and electric network protection control method
RU2722468C1 (en) * 2020-02-20 2020-06-01 Сергей Иванович Малафеев Method of controlling insulation resistance and protective switching-off of an electrical network
RU2747909C1 (en) * 2020-10-19 2021-05-17 Сергей Иванович Малафеев Method for control of insulation resistance and protection of electric network with insulated neutral
RU2757068C1 (en) * 2020-11-20 2021-10-11 Сергей Иванович Малафеев Method for monitoring the insulation resistance in a double-current type electric network

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