CN210780068U - Intelligent grounding resistor cabinet of low-voltage 660V system - Google Patents
Intelligent grounding resistor cabinet of low-voltage 660V system Download PDFInfo
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- CN210780068U CN210780068U CN201921815420.XU CN201921815420U CN210780068U CN 210780068 U CN210780068 U CN 210780068U CN 201921815420 U CN201921815420 U CN 201921815420U CN 210780068 U CN210780068 U CN 210780068U
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Abstract
The utility model discloses a low pressure 660V system intelligence ground resistance cabinet, it includes main loop and control circuit, and control circuit includes many branch roads: branch one: a normally open contact of the overcurrent protector JDJ and an electromagnetic coil of the first intermediate relay KA1 are connected in series in the first branch; a branch circuit II: a first normally open contact KA1-1 of the first intermediate relay KA1, the button SB and the sound and light alarm device are connected in series in the second branch; branch three: the second normally open contact KA1-2 and the radiator fan FS of the first intermediate relay KA1 are connected in series in the third branch. The utility model discloses a change the control wiring, replace conventional ground connection relay with circuit overcurrent protector, change the interior component arrangement of grounding cabinet and just can realize remote intelligent monitoring, guarantee through installing the radiator fan that can self-starting additional that the in-cabinet heat does not gather, set up temperature in the thermal resistance measurement cabinet, ensure the safe and reliable operation of system.
Description
Technical Field
The utility model belongs to the improvement field of electrical control method specifically is a low pressure 660V system intelligence ground resistance cabinet.
Background
A conventional power distribution system is shown in fig. 1 and a control system is shown in fig. 2. When a ground fault occurs, only an acoustic signal is sent out on the ground resistor cabinet, and the functions of ground fault communication, real-time monitoring of leakage current and fault current, automatic air exhaust and heat dissipation and temperature interlocking are not provided. The relevant national standard regulations stipulate that when a ground fault occurs, the ground fault current should not be greater than 5A. According to long-term operating experience, the ground fault current is usually considered as 3A. If the single-phase ground fault short-circuit current is considered as 3A, the fault phase voltage is 660/1.732-380V, and the ground resistance is 380/3-126.6 Ω, and 127 Ω is selected. Because the system still needs to operate when the power supply system has a point ground fault, the heating value of the resistor in the ground resistor cabinet is 380 × 3 — 1140W, and if the heat is not dissipated forcibly, the heat in the resistor cabinet is increased more and more, which affects the normal operation.
SUMMERY OF THE UTILITY MODEL
The application provides an improved scheme for solving the problems in the background technology.
Technical scheme
An intelligent grounding resistance cabinet of a low-voltage 660V system comprises a main loop and a control loop,
the main circuit comprises a grounding resistor R and a current transformer CT, wherein the primary side of the current transformer CT is connected with the grounding resistor R in series and is connected between a neutral point of the transformer and the ground;
the secondary side of the current transformer CT is connected in series with the electromagnetic coil of the overcurrent protector JDJ to form a closed loop;
the control loop comprises a plurality of branches:
branch one: a normally open contact of the overcurrent protector JDJ and an electromagnetic coil of the first intermediate relay KA1 are connected in series in the first branch;
a branch circuit II: a first normally open contact KA1-1 of the first intermediate relay KA1, the button SB and the sound and light alarm device are connected in series in the second branch;
branch three: the second normally open contact KA1-2 and the radiator fan FS of the first intermediate relay KA1 are connected in series in the third branch.
Preferably, it further comprises a branch four: and a temperature controller W containing a thermistor RT is connected in series in the fourth branch.
Preferably, it further comprises a branch five: the electromagnetic coil of the second intermediate relay KA2 is connected in series in the fifth branch; the normally open contact of the second intermediate relay KA2 is connected to the control loop power state display circuit.
Preferably, it further comprises a branch six: an overcurrent protector JDJ is connected in series in branch six and is powered by the control loop.
Preferably, the third normally open contact KA1-3 of the first intermediate relay KA1 is connected with the system ground fault state display circuit.
Preferably, the overcurrent protector JDJ is connected with the control room integrated automation system through RS485 to transmit communication signals.
Preferably, the cooling fan FS and the ground resistor R are mounted on the upper portion of the resistor cabinet, the control element is mounted on the lower portion of the resistor cabinet, a partition plate is disposed between the ground resistor R and the control element, and the resistor cabinet above the partition plate is provided with a louver air inlet.
Preferably, the cooling fan FS is disposed at the rear upper portion of the resistor cabinet, and the louver air inlet is disposed at the front lower portion of the resistor cabinet.
The beneficial effects of the utility model
Adopt overcurrent protector JDJ to replace conventional ground relay for power supply system has ground fault can be monitored at any time to the transformer substation of no person on duty through the control room integrated automation system department that long-range someone was on duty, also can monitor the leakage current size in the ground resistance at any time (almost 0 when normal operating, there is certain electric current when insulating damage, the electric current is 3A when insulating damage completely), ground fault and control power supply fault contact send to control room integrated automation system simultaneously, just can send audible and visual alarm signal in integrated automation system department, also can show real-time current through circuit overcurrent protector on local ground resistance cabinet. In addition, the arrangement is changed and the fan is additionally arranged, and the numerical value of the control element is arranged at the bottom, so that the control element in the cabinet is less influenced by the heating of the grounding resistor, the heat dissipation fan can be automatically started when the grounding fault of an electric system occurs, the heat generated on the grounding resistor is discharged out of the cabinet, and the grounding resistor cabinet is prevented from influencing the work due to overheating. In order to improve the safety and reliability of system operation, a thermal resistor is arranged in a grounding resistor cabinet to monitor the temperature in the cabinet, signals are transmitted to a control room integrated automation system and a transformer incoming/outgoing line breaker QF1 or QF2, and early warning signals and tripping commands are sent according to different temperature limit values, so that the safety and reliability of a power distribution system are guaranteed.
Drawings
FIG. 1 is a diagram of a conventional power distribution system
FIG. 2 is a diagram of a conventional power distribution control system in the background art
FIG. 3 is a diagram of a power distribution control system of the present application
FIG. 4 is a structural front view of the intelligent grounding resistor cabinet of the present application
FIG. 5 is a structural side view of the intelligent grounding resistor cabinet of the present application
Detailed Description
The present invention will be further explained with reference to the following examples, but the scope of the present invention is not limited thereto:
an intelligent grounding resistance cabinet of a low-voltage 660V system comprises a main loop and a control loop,
as shown in fig. 1, the main circuit includes a ground resistor R and a current transformer CT, a primary side of the current transformer CT is connected in series with the ground resistor R and is connected between a neutral point of the transformer and ground;
referring to fig. 3, the secondary side of the current transformer CT is connected in series with the electromagnetic coil of the overcurrent protector JDJ to form a closed loop;
the control loop comprises a plurality of branches:
branch one: a normally open contact of the overcurrent protector JDJ and an electromagnetic coil of the first intermediate relay KA1 are connected in series in the first branch;
a branch circuit II: the first normally open contact KA1-1 of the first intermediate relay KA1, the button SB and the sound and light alarm device are connected in series in the second branch, and after the electromagnetic coil of the first intermediate relay KA1 is electrified, the sound and light alarm device is started;
by changing the control wiring, a conventional grounding relay is replaced by a line overcurrent protector JDJ to realize audible and visual alarm.
Branch three: the second normally open contact KA1-2 of the first intermediate relay KA1 and the cooling fan FS are connected in series in the third branch, and after the electromagnetic coil of the first intermediate relay KA1 is electrified, the cooling fan FS works. The heat dissipation fan capable of being automatically started is additionally arranged to ensure that heat in the cabinet is not accumulated, the thermal resistor is arranged to measure the temperature in the cabinet, and the safe and reliable operation of the system is ensured.
And a branch is four: a temperature controller W containing a thermistor RT is connected in series in the fourth branch; by setting the threshold value of the temperature controller W, when the threshold value exceeds T1, a first switch W1 of the temperature controller W is connected to an alarm loop to send an alarm signal to a control room; when the threshold value T2 is exceeded, the second switch W2 of the thermostat W is connected to a tripping circuit to send a tripping signal to the high-voltage cabinet.
A branch circuit five: the electromagnetic coil of the second intermediate relay KA2 is connected in series in the fifth branch; the normally open contact of the second intermediate relay KA2 is connected to the control loop power state display circuit, and the control loop power state display circuit is disconnected, which indicates the control power failure.
A branch circuit six: an overcurrent protector JDJ is connected in series in branch six and is powered by the control loop.
Preferably, the third normally open contact KA1-3 of the first intermediate relay KA1 is connected to the system ground fault state display circuit, and the system ground fault state display circuit is connected to indicate that a ground fault occurs.
The overcurrent protector JDJ is connected with the control room integrated automation system through RS485 to transmit communication signals. And remote intelligent monitoring is realized.
When the system has a ground fault, current flows through the current transformer CT, the line overcurrent protector JDJ acts, an audible and visual alarm signal is sent out by driving the intermediate relay KA1-1, and the button SB is used for removing the audible and visual alarm signal. KA1-3, KA2 and RS485 communicate to send system ground fault signals, control power fault signals and current to a control room comprehensive automatic system on duty, and a cooling fan FS can be automatically started based on KA 1-2. A temperature controller W is arranged in the grounding resistor cabinet, and a temperature signal in the cabinet is sent to a control room integrated automation system for alarming and tripping of a transformer incoming/outgoing line breaker QF1 or QF 2.
From long-term operating experience, the ground fault current is typically considered 3A and is chosen to be 127 Ω. With reference to fig. 4-5, a resistor cabinet structure suitable for the control system proposed in the present application is shown. The radiator fan 2 and the ground resistor 3 are arranged on the upper part of the resistor cabinet 1, the control element 5 is arranged on the lower part of the resistor cabinet 1, a partition plate 4 is arranged between the ground resistor 3 and the control element (comprising a current transformer CT, an overcurrent protector JDJ, an intermediate relay, a temperature controller W and the like) 5, and the resistor cabinet 1 above the partition plate 4 is provided with a shutter air inlet 6.
Preferably, the heat dissipation fan 2 is arranged at the rear upper part of the resistor cabinet 1, and the louver air inlet 6 is arranged at the front lower part of the resistor cabinet 1. The hot air is completely convected and exhausted out of the cabinet.
The utility model discloses a change the control wiring, replace conventional ground connection relay with circuit overcurrent protector, change the interior component arrangement of grounding cabinet and just can realize remote intelligent monitoring, guarantee through installing the radiator fan that can self-starting additional that the in-cabinet heat does not gather, set up temperature in the thermal resistance measurement cabinet, ensure the safe and reliable operation of system.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (8)
1. An intelligent grounding resistance cabinet of a low-voltage 660V system is characterized by comprising a main loop and a control loop,
the main circuit comprises a grounding resistor R and a current transformer CT, wherein the primary side of the current transformer CT is connected with the grounding resistor R in series and is connected between a neutral point of the transformer and the ground;
the secondary side of the current transformer CT is connected in series with the electromagnetic coil of the overcurrent protector JDJ to form a closed loop;
the control loop comprises a plurality of branches:
branch one: a normally open contact of the overcurrent protector JDJ and an electromagnetic coil of the first intermediate relay KA1 are connected in series in the first branch;
a branch circuit II: a first normally open contact KA1-1 of the first intermediate relay KA1, the button SB and the sound and light alarm device are connected in series in the second branch;
branch three: the second normally open contact KA1-2 and the radiator fan FS of the first intermediate relay KA1 are connected in series in the third branch.
2. The intelligent grounding resistor cabinet of low-voltage 660V system according to claim 1, characterized in that it further comprises branch four: and a temperature controller W containing a thermistor RT is connected in series in the fourth branch.
3. The intelligent grounding resistor cabinet of a low-voltage 660V system according to claim 1, characterized by further comprising a branch circuit five: the electromagnetic coil of the second intermediate relay KA2 is connected in series in the fifth branch; the normally open contact of the second intermediate relay KA2 is connected to the control loop power state display circuit.
4. The intelligent grounding resistor cabinet of low-voltage 660V system according to claim 1, characterized in that it further comprises branch six: an overcurrent protector JDJ is connected in series in branch six and is powered by the control loop.
5. The intelligent grounding resistor cabinet of low-voltage 660V system according to claim 1, characterized in that the third normally open contact KA1-3 of the first intermediate relay KA1 is connected to the system ground fault state display circuit.
6. The intelligent grounding resistor cabinet of low-voltage 660V system as claimed in claim 1, wherein the over-current protector JDJ is connected with the control room integrated automation system through RS485 to transmit communication signals.
7. The intelligent grounding resistor cabinet of low-voltage 660V system as claimed in claim 1, wherein the cooling fan FS and the grounding resistor R are installed on the upper part of the resistor cabinet, the control element is installed on the lower part of the resistor cabinet, a partition is arranged between the grounding resistor R and the control element, and the resistor cabinet above the partition is provided with a louver air inlet.
8. The intelligent grounding resistor cabinet of a low-voltage 660V system as claimed in claim 1, wherein the cooling fan FS is arranged at the rear upper part of the resistor cabinet, and the louver air inlet is arranged at the front lower part of the resistor cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921815420.XU CN210780068U (en) | 2019-10-24 | 2019-10-24 | Intelligent grounding resistor cabinet of low-voltage 660V system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921815420.XU CN210780068U (en) | 2019-10-24 | 2019-10-24 | Intelligent grounding resistor cabinet of low-voltage 660V system |
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| CN210780068U true CN210780068U (en) | 2020-06-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112184975A (en) * | 2020-09-27 | 2021-01-05 | 江苏思源赫兹互感器有限公司 | High-voltage laboratory safety grounding and entrance guard interlocking control system |
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2019
- 2019-10-24 CN CN201921815420.XU patent/CN210780068U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112184975A (en) * | 2020-09-27 | 2021-01-05 | 江苏思源赫兹互感器有限公司 | High-voltage laboratory safety grounding and entrance guard interlocking control system |
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