KR101626140B1

KR101626140B1 - Distributing board for monitoring surge and diagnosing ground performance

Info

Publication number: KR101626140B1
Application number: KR1020150179130A
Authority: KR
Inventors: 전택수
Original assignee: 전택수
Priority date: 2015-12-15
Filing date: 2015-12-15
Publication date: 2016-05-31

Abstract

The present invention relates to a surveillance and grounding performance diagnosis and distribution panel,
A surge sensor installed at the grounding line connecting the main grounding pole and the main grounding terminal and measuring surge current or grounding current, a voltmeter installed between the main grounding terminal and the test grounding terminal for measuring the grounding voltage, the voltage measured from the voltmeter and the surge sensor, And a power monitoring and control system that calculates and monitors the ground resistance value by receiving the current and monitors the surge in real time while simultaneously calculating the ground resistance value using the measured surge current value or ground fault current value. Can be diagnosed.

Description

[0002] DISTRIBUTING BOARD FOR MONITORING SURGE AND DIAGNOSING GROUND PERFORMANCE [0003]

The present invention relates to a surge monitoring and grounding performance diagnosis and control system, and more particularly, to monitoring surge current and ground current, and to calculate a ground resistance value based on a measured surge current value or a ground fault current value, Surge monitoring and grounding performance diagnosis function.

Switching and distribution systems that receive and distribute electricity tend to use IT-based control systems to increase the safety, reliability, and economy of facilities, and to make them smaller and lighter.

This IT-based control system is comprised of IT components, for example semiconductor components, which are susceptible to surge and noise due to their nonlinear characteristics.

Therefore, electrical components such as protective relays formed in a switchboard including a semiconductor device having nonlinear characteristics may be affected by surge or noise, which may interfere with the operation of the device.

As such, it is important to detect the generation path of surge or noise in a switchboard including a semiconductor device, and real-time monitoring and monitoring of surge and noise is required to improve the safety of the switchboard.

In addition, grounding facilities are installed in the switchboard to prevent electric shocks and to protect the main receiving facilities. However, such grounding facilities are required to continuously monitor the grounding performance due to electrical and chemical corrosion and aged deterioration.

Regarding such a problem, Korean Patent Registration No. 10-1251058 discloses an EMI monitoring apparatus for monitoring an EMI (Electro Magnetic Interference) generated in a surge entering through a power supply and an EMI A switchboard is disclosed.

Korean Patent Registration No. 10-1516776 discloses a grounding system diagnosis apparatus that diagnoses and monitors a grounding system in real time. However, the grounding system diagnosis apparatus applies a signal generated through a separate signal generating unit to a grounding electrode, There is a problem that a large amount of cost is required for installation and maintenance since it is a method of measuring a signal to be returned from the ground electrode.

Therefore, in the present invention, the ground fault current is measured from various surge currents and power systems flowing into the grounding equipment of the switchgear and the surge is monitored in real time, and at the same time, the ground resistance value is calculated using the measured surge current value or ground fault current value And a surge monitoring and grounding performance diagnosis function for diagnosing the grounding performance.

Surge monitoring and grounding performance diagnosis of the present invention In order to monitor the surge current, grounding current and grounding resistance in real time, a surge sensor is installed on a grounding line connecting the main grounding pole and the main grounding terminal, , A voltmeter installed between the main ground terminal and the test ground terminal to measure the ground voltage, and a power monitoring and control system that receives the voltage and current measured from the voltmeter and the surge sensor and calculates and monitors the ground resistance value.

According to this characteristic, in the surge monitoring and grounding performance diagnosis and control panel, the grounding resistance is calculated by measuring the surge current value or the grounding current value simultaneously while monitoring the surge in real time without installing a separate grounding system diagnosis device. Can be diagnosed.

In addition, it is possible to use the ground fault current value classified by the power source side in the ground fault accident and the ground fault current value classified by the ground pole of the power transformer equipments accurately and utilize it effectively in re-correction of the ground fault relay.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram of a sensor installation site and surge and noise monitoring system according to the present invention.
2 is a block diagram showing an example of real-time monitoring when a lightning surge occurs.
3 is a block diagram showing an example of real-time monitoring when a ground fault occurs in a power system.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Hereinafter, the surge monitoring and grounding performance diagnosis and distribution panel of the present invention will be described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram of a sensor installation site and surge and noise monitoring system according to the present invention.

The surge monitoring and grounding performance diagnosis switchboard of the present invention includes a surge sensor 500 installed on a ground line connecting the main electrode 100 and the main ground terminal 200 to measure a surge current or a ground fault current, A voltmeter 700 installed between the ground terminal 300 and the test ground terminal 300 for measuring the ground voltage, a voltage meter 700 for measuring the ground voltage, And a control system (400). In addition to the surge sensor 500, a noise sensor 600 may be selectively installed on the ground line.

In addition, there is a surge sensor or a noise sensor (not shown) on the ground line between the main equipment connected to the switchgear such as lightning protection equipments, communication equipments, electric motor (M), motor control panel (MCC), transformer, surge protector And the measured signal value may be transmitted to the power monitoring and control system 400 and configured to be monitored.

Here, the surge sensor 500 can be applied to a Rogowski coil, an optical fiber type, or a Hall sensor type sensor which can measure AC and DC at the same time because there is no magnetic saturation because the surge current is extremely large instantaneously.

The noise sensor 600 may be a magnetic ammeter used in a transformer CT because it has a comparatively small energy in terms of noise characteristics. However, the present invention is not limited thereto, and any sensor capable of measuring noise can be used .

The operation of the surge monitoring and grounding performance diagnosis and control panel will be described with reference to FIG. 2 and FIG.

2 is a block diagram showing an example of real-time monitoring when a lightning surge occurs.

When a surge due to a direct lightning strikes through the lightning system, the lightning surge current (ISL) flows through the surge current (ISG) flowing to the ground and the surge current (ISP) led through the ground line. The surge current (ISP) is divided into a surge current (ISS) flowing to the power source ground line, a surge current (IST) flowing to the neutral point ground of the transformer, and a surge current (ISE) flowing to the ground wire of the device.

These surge current values are measured by a surge sensor installed at each part, transmitted to the power monitoring and control system 400, and analyzed and stored as data by a surge and noise analysis algorithm.

In the voltmeter 700, the surge current ISP induced through the ground line measures the ground voltage VE when passing through the ground line and transmits it to the power monitoring and control system 400. The measured ground voltage VE and the ground line The ground resistance value R is calculated by using the value of the surge current (ISP) induced through the resistor R as follows.

Ground resistance (R) = Ground voltage (VE) / Surge current (ISP)

3 is a block diagram showing an example of real-time monitoring when a ground fault occurs in a power system.

When a ground fault occurs in the power system, a ground fault current (IGT) flows through the neutral point of the transformer. This causes a ground fault current (IGG) flowing to the main ground pole (100), a ground fault current (IGE) flowing to the ground.

In this case, as in the case of the surge current caused by the lightning stroke, these ground fault current values are measured by a surge sensor installed at each part and transmitted to the power monitoring and control system 400, and analyzed by the surge and noise analysis algorithm and stored as data.

In the voltmeter 700, the grounding current ISP flowing through the main grounding electrode 100 measures a ground voltage VE when the grounding current passes through the grounding line, and transmits the measured grounding voltage VE to the power monitoring and control system 400. And the earth ground current IGG flowing to the main ground electrode 100 are used to calculate the ground resistance value R as follows and stored as data.

Ground resistance (R) = ground voltage (VE) / ground fault current (IGG)

This grounding resistance value (R) should be kept constant according to the grounding method (in case of class 1 grounding, 10 Ω common ground and integrated ground: 2 ~ 3 Ω, It is not easy to measure the ground resistance value R while the rain is being used, and in order to measure it in real time, a separate diagnostic device is required. However, the present invention solves this problem, It is possible to confirm the deterioration state of the grounding equipment more accurately by comparing the ground resistance value (R) calculated using the ground fault current with the reference value.

As described above, according to the present invention, a surge sensor or a noise sensor is installed in the main equipment connected to the switchboard, so that surge and noise introduced into the equipment can be monitored in real time and coped with. In particular, surge current, ground fault current and ground voltage It is possible to grasp the state of degradation of the grounding performance without a separate diagnostic device by calculating the grounding resistance value by measuring.

In addition, since the classification amount of the ground fault current can be grasped, it is possible to precisely re-correct the ground fault relay to protect the power transmission facilities in case of a ground fault and to prevent the electric shock.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

100: main earth pole 200: main ground terminal
300: Test ground terminal 301: Test ground terminal
400: Power monitoring control system 500: Surge sensor
600: noise sensor 700: voltmeter

Claims

A surge sensor installed at a ground line connecting the main ground electrode and the main ground terminal to measure a surge current or a ground fault current and a noise sensor for measuring noise;
A voltmeter installed between the main ground terminal and the test ground electrode to measure a ground voltage;
Surge sensor installed at each grounding line connecting surge protection equipment, communication equipment, electric motor (M), motor control panel (MCC), transformer, surge protector (SPD), emergency generator and main earth terminal to measure surge current or ground fault current And a noise sensor for measuring noise;
And a power monitoring and control system for receiving and monitoring a ground voltage, a surge current, a ground fault current, and a noise signal measured from the voltmeter, the surge sensor, and the noise sensor,
The power monitoring and control system monitors the IGG, IGS, IGT, and IGE of the main grounding pole, IGT, IGT, And a monitoring unit for receiving the measured value and monitoring it so that it can be used for re-correction of each corresponding ground fault relay.

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The method according to claim 1,
The power monitoring and control system calculates a grounding resistance value by using a surge current or a ground fault current measured by a surge sensor connected to a grounding line connecting the main grounding pole and the main grounding terminal and a grounding voltage measured by the voltmeter, Surge monitoring and grounding performance diagnostic switchboard featuring.

The method according to claim 1,
Wherein the surge sensors are Rogowski coils, optical fiber sensors, and Hall sensor sensors.

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