CN111239643A - Single-phase grounding test device and method for power distribution network - Google Patents
Single-phase grounding test device and method for power distribution network Download PDFInfo
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- CN111239643A CN111239643A CN201910771903.2A CN201910771903A CN111239643A CN 111239643 A CN111239643 A CN 111239643A CN 201910771903 A CN201910771903 A CN 201910771903A CN 111239643 A CN111239643 A CN 111239643A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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Abstract
The invention discloses a single-phase grounding test device for a power distribution network, which comprises a three-phase intelligent circuit breaker unit, a phase selection circuit breaker unit, a grounding fault type unit, a current transformer measuring unit, a voltage transformer measuring unit, a fault grounding current measuring unit, a wireless data receiving unit and an experimental data analyzing unit. The phase selection circuit breaker unit has the advantages that the initial phase angle of a fault is controllable, the on-off of a single-phase grounding circuit is directly remotely controlled, manual circuit replacement is not needed on site, and the safety of workers in an experiment is guaranteed. The phase selection circuit breaker unit has various earth fault types, and can switch different earth type states and control time according to field conditions to simulate single-phase earth experimental states in different environments. Meanwhile, the wireless data receiving unit can receive and transmit wireless signals, and can display various current, voltage and other data of the single-phase grounding experiment on the experiment data analysis unit, so that experimenters can conveniently judge and analyze the data.
Description
Technical Field
The invention relates to the field of distribution network ground fault tests, in particular to a single-phase ground test device and a single-phase ground test method for a distribution network.
Background
At present, under the new potential of power distribution network automation acceleration, when devices such as a line fault indicator, low-current ground protection, feeder automation and distributed power supply access of a power distribution network are put into operation, single-phase ground points need to be arranged at different positions of each outgoing line of the power distribution network to test performance conditions such as overcurrent and protection of the outgoing line, and particularly, ground tests under different fault conditions need to be simulated to guarantee the safety of power utilization of the power distribution network. The existing field manual single-phase grounding is generally only based on experience values or a simple grounding mode is utilized to carry out a single-phase grounding test, and the safety and the reliability of the single-phase grounding test are not guaranteed. Meanwhile, the parameters of the grounding device are not controllable, and accurate data required by experimenters cannot be obtained in grounding experiment tests.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the utility model provides a distribution network single-phase grounding test device and an experimental method, which aims to solve the problems that in the prior art, a grounding device is unreliable and parameters of the grounding device are uncontrollable during a distribution network grounding experiment.
The technical scheme of the invention is as follows:
as shown in fig. 1: a single-phase grounding test device of a power distribution network comprises a power distribution network 1 and a grounding device 11, wherein a three-phase power line of the power distribution network 1 is connected with a three-phase wiring terminal of an isolating switch unit 202; the output circuit of the isolating switch unit 202 is connected with the input end of the three-phase intelligent circuit breaker unit 203; the input power line of the phase selection circuit breaker control unit 204 is connected with any phase output power terminal of the three-phase intelligent circuit breaker unit 203, and can be adjusted according to actual needs after the power line is cut off in an experiment.
A ground fault type unit 205 is connected between the phase selection breaker control unit 204 and the grounding device 11.
Preferably, the isolation switch unit 204 is a GW4-35 isolation switch provided by shanghai lake ka power equipment limited.
The single-phase grounding device 2 further comprises a current transformer measuring unit 206, a voltage transformer measuring unit 207, a fault grounding current measuring unit 210, a wireless data receiving unit 208 and an experimental data analyzing unit 209; the current transformer measuring unit 206 is connected with a three-phase power line of the power distribution network 1; the voltage transformer measuring unit 7 is connected with a three-phase wiring terminal of the three-phase intelligent circuit breaker unit 203; a fault grounding current measuring unit 210 is connected in series between the remote control unit 205 and the grounding device 11; the wireless data receiving unit 208 is connected with the experimental data analyzing unit 209.
Preferably, the current transformer measuring unit 206 is a CMA-310-.
Preferably, the voltage transformer measuring unit 207 is a JDZ11-15 voltage transformer manufactured by zhejiang mutual engineering electrical technology ltd.
Preferably, the fault ground current measuring unit 210 is a single-phase digital display ac ammeter of model PA194I-9X1 provided by yoeyn sfiel ltd.
As shown in fig. 2, the phase selection breaker control unit 204 includes a voltage transformer acquisition unit, a control unit and a breaker; the three-phase intelligent circuit breaker 203 is connected with a voltage transformer; the voltage transformer is connected with the control unit; the control unit is connected with the circuit breaker; the circuit breaker is connected to a fault type unit 205. The voltage transformer acquires a voltage phase in real time and transmits the voltage phase to the control unit, and the control unit controls the breaker to be switched on when detecting that the voltage phase is equal to a voltage fault initial phase, so that the circuit is directly controlled at an initial angle of various faults to obtain desired experimental data.
Preferably, the three-phase intelligent circuit breaker unit 203 is an XY 47-100S type GPRS wireless remote control switch circuit breaker provided by Shanghai Xiya electronic Co.
Preferably, the control unit is selected from STM32H7 series high performance MCU provided by Shanghai meaning semiconductor (China) investment Limited.
Preferably, the voltage transformer is a JDZ10-10 voltage transformer provided by Zhejiang Shuicho electric power technology, Inc.
Preferably, the circuit breaker is a VS1-12KV/630A indoor vacuum circuit breaker provided by Sichuan more electric company.
As shown in fig. 3, the ground fault type unit 205 includes a ground fault unit and a control unit; the three-phase intelligent circuit breaker 203 is connected with a grounding fault unit lead; the ground fault unit is connected with the control unit; the control unit is connected with a fault ground current measuring unit 210.
The ground fault unit ground fault types include metallic ground, high resistance ground, intermittent arc ground, and low resistance ground. Before the experiment, switching can be carried out according to different requirements so as to simulate the ground fault under different environments.
Preferably, the ground fault type unit 205 is an SHJ-I panel type fault indicator provided by yokowa, inc.
The current transformer measuring unit 206, the voltage transformer measuring unit 207 and the fault ground current measuring unit 210 are mounted with wireless data transmission units. The wireless data transmission unit may receive signals from a remote location and transmit data to the wireless data reception unit 208.
Preferably, the wireless data transmission unit adopts a HIT-232DTU-4G model communication module produced by Shenzhen Huasheng technology Limited. An experimental method of a single-phase grounding test device of a power distribution network comprises the following steps:
step 1, grounding a grounding device;
step 2, putting power switches of the phase selection circuit breaker unit and the three-phase intelligent circuit breaker unit in a breaking state, and setting a fault initial phase angle and ground fault time of the phase selection circuit breaker unit;
step 3, communicating all units according to the circuit connection relation;
step 4, closing the switch of the isolating switch unit by using an insulating rod;
step 5, remotely controlling the phase selection circuit breaker unit and the three-phase intelligent circuit breaker unit, and placing the power switch in a closed state;
step 6, remotely controlling the grounding fault type unit and selecting a required grounding fault type;
and 7, acquiring experimental data.
The method for acquiring the experimental data comprises the following steps: the collected data are transmitted to the wireless data receiving unit through the current transformer measuring unit, the voltage transformer measuring unit and the fault grounding current measuring unit through wireless signals, and finally the experimental data analyzing unit processes the data.
The invention has the beneficial effects that:
1. the three-phase intelligent circuit breaker unit, the phase selection circuit breaker unit and the ground fault type unit have a remote control function, wherein the phase selection circuit breaker unit has a controllable fault initial phase angle, and the on-off of a single-phase ground circuit is directly remotely controlled in a remote manner, so that the safety of workers during experimental operation is ensured.
2. The phase selection circuit breaker unit has various earth fault types, and can freely switch different earth type states and time according to field conditions to simulate single-phase earth experimental states in different environments. Meanwhile, the unit has a remote control function, so that personnel do not need to manually replace lines on site, and the risk of electric shock of the personnel is avoided.
3. The voltage transformer measuring unit, the current transformer measuring unit, the fault grounding current measuring unit and the wireless data receiving unit can receive and transmit wireless signals, and various current, voltage and other data of a single-phase grounding experiment can be visually seen through the experiment data analyzing unit, so that experimenters can conveniently judge and analyze, and the experiment controllability is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a phase selection circuit breaker control unit according to the present invention;
fig. 3 is a schematic diagram of a ground fault type unit structure according to the present invention.
Detailed Description
As shown in fig. 1: a single-phase grounding test device of a power distribution network comprises a power distribution network 1 and a grounding device 11, wherein a three-phase power line of the power distribution network 1 is connected with a three-phase wiring terminal of an isolating switch unit 202; the output circuit of the isolating switch unit 202 is connected with the input end of the three-phase intelligent circuit breaker unit 203; the input power line of the phase selection breaker unit 204 is connected with any phase output power terminal of the three-phase intelligent breaker unit 203, and can be adjusted according to actual needs after the power line is cut off in an experiment.
A ground fault type unit 205 is connected between the phase selection breaker unit 204 and the grounding device 11.
Preferably, the isolation switch unit 204 is a GW4-35 isolation switch provided by shanghai lake ka power equipment limited.
The single-phase grounding device 2 further comprises a current transformer measuring unit 206, a voltage transformer measuring unit 207, a fault grounding current measuring unit 210, a wireless data receiving unit 208 and an experimental data analyzing unit 209; the current transformer measuring unit 206 is connected with a three-phase power line of the power distribution network 1; the voltage transformer measuring unit 7 is connected with a three-phase wiring terminal of the three-phase intelligent circuit breaker unit 203; a fault grounding current measuring unit 210 is connected in series between the remote control unit 205 and the grounding device 11; the wireless data receiving unit 208 is connected with the experimental data analyzing unit 209.
The phase selection breaker unit 204 can generate faults at any voltage fault initial phase, and can directly control the initial angle of various faults to obtain desired experimental data. Preferably, the phase selection circuit breaker unit 204 is a CIGRE KY13.07 phase selection control circuit breaker provided by shanghai kunfou electromechanical devices, ltd. Preferably, the phase selection breaker unit 204 is a Gigre WG13.07 phase selection control breaker provided by shanghai kunfou electrical limited.
The three-phase smart breaker unit 203, the phase selection breaker unit 204 and the earth fault type unit 205 have a remote control function. Preferably, the three-phase intelligent circuit breaker unit 203 is an XY 47-100S type GPRS wireless remote control switch circuit breaker provided by Shanghai Xiya electronic Co.
The ground fault types of the ground fault type unit 205 include metallic ground, high resistance ground, intermittent arc ground, and low resistance ground. Before the experiment, switching can be carried out according to different requirements so as to simulate the ground fault under different environments. Preferably, the ground fault type unit 205 is an SHJ-I panel type fault indicator provided by yokowa, inc.
Wireless receiving devices are installed on the current transformer measuring unit 206, the voltage transformer measuring unit 207 and the fault ground current measuring unit 210. Can receive signals from a remote end and transmit data to the wireless data receiving unit 208. Preferably, the current transformer measuring unit 206 is a CMA-310-.
Preferably, the voltage transformer measuring unit 207 is a JDZ11-15 voltage transformer manufactured by zhejiang mutual engineering electrical technology ltd.
Preferably, the fault ground current measuring unit 210 is a single-phase digital display ac ammeter of model PA194I-9X1 provided by yoeyn sfiel ltd.
An experimental method of a single-phase grounding test device of a power distribution network comprises the following steps:
step 1, grounding the grounding device 11 first, so as to prevent the whole device from being in an under-protection state when the experimental device is powered on first, and the safety of the protective device and workers is facilitated.
Step 2, putting the power switches of the phase selection breaker unit 204 and the three-phase intelligent breaker unit 203 into a breaking state, and setting a fault initial phase angle and ground fault time of the phase selection breaker unit 204;
step 3, communicating all units according to the circuit connection relation;
step 4, according to the relevant safety regulations of the electric power, the safe distance of the step voltage is 8 meters away from the grounding point, so that the switch of the isolating switch unit 202 is closed by using an insulating rod outside the safe distance;
step 5, remotely controlling the phase selection breaker unit 204 and the three-phase intelligent breaker unit 203, and placing a power switch in a closed state;
step 6, in the experimental process, the earth fault type unit 205 can be remotely controlled according to the requirement to select the required earth fault type;
and 7, acquiring experimental data.
The method for acquiring the experimental data comprises the following steps: the collected data are transmitted to the wireless data receiving unit 207 through wireless signals through the current transformer measuring unit 206, the voltage transformer measuring unit 207 and the fault grounding current measuring unit 210, and finally data processing is performed through the experimental data analyzing unit 209.
Claims (8)
1. The utility model provides a single-phase ground connection test device of distribution network, it includes distribution network (1) and earthing device (11), its characterized in that: a three-phase power line of the power distribution network (1) is connected with a three-phase wiring terminal of the isolating switch unit (202); an output circuit of the isolating switch unit (202) is connected with an input end of the three-phase intelligent circuit breaker unit (203); an input power line of the phase selection circuit breaker unit (204) is connected with any phase output power terminal of the three-phase intelligent circuit breaker unit (203); a ground fault type unit (205) is connected between the phase selection breaker unit (204) and the grounding device (11).
2. The single-phase grounding test device for the power distribution network according to claim 1, wherein: the device also comprises a current transformer measuring unit (206), a voltage transformer measuring unit (207), a fault grounding current measuring unit (210), a wireless data receiving unit (208) and an experimental data analyzing unit (209); the current transformer measuring unit (206) is connected with a three-phase power line of the power distribution network (1); the voltage transformer measuring unit (7) is connected with a three-phase wiring terminal of the three-phase intelligent circuit breaker unit (203); a fault grounding current measuring unit (210) is connected in series between the remote control unit (205) and the grounding device (11); the current transformer measuring unit (206), the voltage transformer measuring unit (207) and the fault grounding current measuring unit (210) are connected with the wireless data receiving unit (207) through wireless signals; the wireless data receiving unit (208) is connected with the experimental data analysis unit (209) through a lead.
3. The power distribution network single-phase grounding test device system according to claim 1, wherein: the phase selection circuit breaker control unit (204) comprises a voltage transformer acquisition unit, a control unit and a circuit breaker; the three-phase intelligent circuit breaker (203) is connected with a voltage transformer; the voltage transformer is connected with the control unit; the control unit is connected with the circuit breaker; the circuit breaker is connected to a fault type unit (205).
4. The single-phase grounding test device for the power distribution network according to claim 1, wherein: the ground fault type unit (205) comprises a ground fault unit and a control unit; the three-phase intelligent circuit breaker (203) is connected with a grounding fault unit lead; the ground fault unit is connected with the control unit; the control unit is connected with a fault grounding current measuring unit (210).
5. The single-phase grounding test device for the power distribution network according to claim 4, wherein: the ground fault types of the ground fault unit include metallic ground, high resistance ground, intermittent arc ground, and low resistance ground.
6. The single-phase grounding test device for the power distribution network according to claim 2, wherein: and wireless data transmission units are arranged on the current transformer measuring unit (206), the voltage transformer measuring unit (207) and the fault grounding current measuring unit (210).
7. The experimental method of the single-phase grounding test device for the power distribution network according to claim 1, characterized in that: the method comprises the following steps:
step 1, grounding a grounding device (11);
step 2, power switches of the phase selection breaker unit (204) and the three-phase intelligent breaker unit (203) are placed in a breaking state, and a fault initial phase angle and ground fault time of the phase selection breaker unit (204) are set;
step 3, communicating all units according to the circuit connection relation;
step 4, closing the switch of the isolating switch unit (202) by using an insulating rod;
step 5, remotely controlling a phase selection breaker unit (204) and a three-phase intelligent breaker unit (203), and placing a power switch in a closed state;
step 6, remotely controlling a ground fault type unit (205) to select a required ground fault type;
and 7, acquiring experimental data.
8. The experimental method of the single-phase grounding test device for the power distribution network according to claim 7, characterized in that: the method for acquiring the experimental data comprises the following steps: collected data are transmitted to the wireless data receiving unit (207) through the current transformer measuring unit (206), the voltage transformer measuring unit (207) and the fault grounding current measuring unit (210) through wireless signals, and finally data processing is carried out through the experimental data analyzing unit (209).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910771903.2A CN111239643A (en) | 2019-08-21 | 2019-08-21 | Single-phase grounding test device and method for power distribution network |
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| CN201910771903.2A CN111239643A (en) | 2019-08-21 | 2019-08-21 | Single-phase grounding test device and method for power distribution network |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285492A (en) * | 2020-12-31 | 2021-01-29 | 中国电力科学研究院有限公司 | Power distribution network ground fault test system and method |
| CN115047224A (en) * | 2022-05-18 | 2022-09-13 | 中检质技检验检测科学研究院有限公司 | Experimental short circuit and fault identification and protection system and application method thereof |
-
2019
- 2019-08-21 CN CN201910771903.2A patent/CN111239643A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285492A (en) * | 2020-12-31 | 2021-01-29 | 中国电力科学研究院有限公司 | Power distribution network ground fault test system and method |
| CN112285492B (en) * | 2020-12-31 | 2021-04-13 | 中国电力科学研究院有限公司 | Power distribution network ground fault test system and method |
| CN115047224A (en) * | 2022-05-18 | 2022-09-13 | 中检质技检验检测科学研究院有限公司 | Experimental short circuit and fault identification and protection system and application method thereof |
| CN115047224B (en) * | 2022-05-18 | 2024-01-09 | 中检质技检验检测科学研究院有限公司 | Using method of identification and protection system for experimental short circuit and fault |
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