DE212022000041U1 - A box transformer with a signal surge protector - Google Patents

Abstract

Box transformer with signal overvoltage protection, characterized in that it comprises a primary electrical circuit (1) and a signal/communication loop (2), the primary electrical circuit (1) being connected to the signal/communication loop (2), the signal/ Communication loop (2) comprises the signal overvoltage protection device (3) and the protection measurement and control device (4), the primary electric circuit (1) is connected to the protection measurement and control device (4) through the signal overvoltage protection device (3) in order to absorb the overvoltage in limit and derive the signal/communications loop (2); wherein the signal overvoltage protector (3) comprises a discharge tube (31), a first insulation resistor (32), a second insulation resistor (33), a first voltage regulator (34) and the second voltage regulator (35), the discharge tube (31) being located at the input terminal of the signal snubber (3) and connected between the positive input terminal of the signal snubber (3), the negative input terminal and the ground line, the first insulation resistor (32) being connected in series with the positive circuit of the signal snubber (3), the second Insulation resistance (33) is connected in series with the negative circuit of the signal snubber (3), the first voltage regulator (34) is connected in parallel between the positive output terminal of the signal snubber (3) and the ground line, the second voltage regulator (35) is connected in parallel between the negative Output terminal of the signal surge protector (3) and the ground wire is connected.

Description

Cross references to related applications

This disclosure claims priority to a Chinese patent application filed on April 28, 2021 with the China Patent Office under application number CN202120898008 .X entitled "A Box Transformer With Signal Surge Protection" and the entire content of which is incorporated by reference into this disclosure.

Technical part

The utility model relates to a box-type transformer, in particular a box-type transformer with signal overvoltage protection.

background technique

The box transformer is an important part of the new energy sector. A protective measurement and control device is equipped in the box-type transformer, which acquires and uploads the operational status signal of the box-type transformer, including switching signal, analog signal, communication signal, etc. These signals are transmitted directly into the protection measurement and control device through the primary electrical devices, sensors and communication devices in the widely used box-type transformers. In the existing box transformers of some new energy fields, a power signal surge protector is connected in parallel to the protection measurement and control device circuit, but no signal surge protector is connected in series in the signal/communication loop. Once an overvoltage is generated or induced in the signal loop or communication loop by external electromagnetic interference, static electricity, lightning, operation, component failure and other factors, the protection measurement and control device will be damaged, resulting in greater losses.

Contents of the utility model

In order to solve the disadvantages of the above technology, the utility model provides a box type transformer with signal surge protection.

In order to solve the above technical problems, the utility model adopts the technical program: a box type transformer with a signal surge protector, which includes a primary electric circuit and a signal/communication loop, the primary electric circuit is connected to the signal/communication loop, the signal /communication loop comprises the signal overvoltage protector and the protection measurement and control device, the primary electrical circuit is connected to the protection measurement and control device through the signal overvoltage protector to limit and derive the overvoltage in the signal/communication loop;
wherein the signal surge protector comprises a discharge tube, a first insulation resistor, a second insulation resistor, a first voltage regulator and the second voltage regulator, the discharge tube being located at the input terminal of the signal surge protector and being connected in parallel between the positive input terminal of the signal surge protector, the negative input terminal and the ground line , where the first insulation resistor is connected in series with the positive circuit of the signal surge protector, the second insulation resistor is connected in series with the negative circuit of the signal surge protector, the first voltage regulator is connected in parallel between the positive output terminal of the signal surge protector and the ground line, the second voltage regulator is connected in parallel connected between the negative output terminal of the signal snubber and the ground line.

Preferably, the discharge tube is a three-pole discharge tube, the three-pole discharge tube comprising an A-pole, a B-pole and a PE-pole, with the A-pole connected to the positive input terminal of the signal surge protector, the B-pole to the negative input terminal of the signal surge protector, the PE pole is connected to the ground wire of the signal surge protector.

Preferably, the positive input terminal of the signal surge protector is connected to the positive contact that detects the primary electrical circuit signal, and the negative input terminal of the signal surge protector is connected to the negative contact that detects the primary electrical circuit signal, with the ground line of the signal surge protector connected to the ground contact which detects the signal of the primary electrical circuit, the positive output terminal of the signal surge protector being connected to the positive contact of the signal input of the protection measurement and control device, the negative output terminal of the signal surge protector being connected to the negative contact of the signal input of the protection measurement and control device is, the ground wire of the signal snubber to the Ground contact of the protection measurement and control device is connected.

Preferably, the primary electrical circuit is connected to the new energy field bus, and the protection measurement and control device is a device in which protection, measurement, control, monitoring, communication, event recording, fault recording and operational fault prevention functions are integrated .

Preferably, the signal/communication loop also comprises a switching signal loop, a 4-20 mA analog signal loop, an RS485 communication signal loop and an Ethernet communication signal loop.

The signal recorded and uploaded by the protection measurement and control device preferably comprises a switching signal of the switching signal loop, a 4-20 mA analog signal of the 4-20 mA analog signal loop, an RS485 communication signal of the RS485 communication signal loop, the switching signal loop, the 4-20 mA analog signal loop and the RS485 communication signal loop are respectively connected to the protection measurement and control device through the signal surge protector, the protection measurement and control device is backward connected to the signal surge protector, and the Ethernet communication signal is transmitted through the Ethernet communication signal loop , which in turn is connected to the box transformer back-end monitoring system, captures the single box transformer operating status signal, and uploads the signal to the box transformer back-end monitoring system.

Preferably, the switching signal includes a 35 kV disconnector status signal, a 35 kV circuit breaker status signal, a 35 kV circuit breaker fault signal, a 35 kV circuit breaker remote position signal, a low-side circuit breaker status signal, a low-side circuit breaker status signal, Fault signal, a low-side circuit breaker remote position signal, a transformer oil overtemperature alarm signal, a high transformer oil temperature trip signal, a transformer pressure relief signal, an abnormal transformer oil level signal, and a transformer box door open signal. Preferably, the 4-20 mA analog signal comprises transformer high-side current amplitude, transformer low-side current amplitude, and transformer oil surface temperature signal.

Preferably, the RS485 communication signal comprises a transformer oil surface temperature sensor communication signal and a box transformer temperature and humidity controller communication signal.

Preferably, the Ethernet communication signal comprises a communication signal between the protection measurement and control device and the back-end monitoring system of the box transformer.

The utility model discloses a box type transformer with signal overvoltage protection to ensure the safe operation of the protective measurement and control device of the box type transformer and to generate or induce damage to the protective measurement and control device due to an overvoltage in the signal loop or communication loop. In the signal loop or communication loop of the utility model, a signal surge protector is connected in series to limit and dissipate the overvoltage and overcurrent in the signal loop or communication loop, thereby realizing protection for the protection measurement and control device.

character list

• 1 Fig. 12 is a schematic representation of the structure of the utility model.
• 2 Fig. 12 is a schematic diagram showing the construction of the signal surge protector of the utility model.

1

Elektrischer Primärkreis;

2

Signal-/Kommunikationsschleife;

3

Signalüberspannungsschutz;

4

Schutzmess- und -steuereinrichtung;

5

Neue Energiefeld- Sammelleitung;

6

Back-End-Überwachungssystem des Kastentransformators;

21

Schaltsignalschleife;

22

4-20-mA-Analogsignalschleife;

23

RS485- Kommunikationssignalschleife;

24

Ethernet-Kommunikationssignalschleife;

31

Entladungsrohr;

32

Erster Isolationswiderstand;

33

Zweiter Isolationswiderstand;

34

Erster Spannungsregler;

35

Zweiter Spannungsregler.

In the figures:

1

electrical primary circuit;

2

signal/communications loop;

3

signal surge protection;

4

Protection measuring and control device;

5

New Energy Field Manifold;

6

Box transformer back-end monitoring system;

21

switching signal loop;

22

4-20 mA analog signal loop;

23

RS485 communication signal loop;

24

Ethernet communication signal loop;

31

discharge tube;

32

First insulation resistance;

33

Second insulation resistance;

34

First voltage regulator;

35

Second voltage regulator.

Specific Embodiments

The utility model is described in more detail below with reference to the specific embodiments and the figures.

Like in the 1 shown, the box transformer with a signal overvoltage protection comprises a primary electrical circuit 1 and a signal/communications loop 2, the primary electrical circuit 1 being connected to the signal/communications loop 2, the signal/communications loop 2 to the signal overvoltage protection 3 and the protection measurement and control device 4, the primary electrical circuit 1 is connected through the signal overvoltage protection device 3 to the protection measurement and control device 4 in order to limit and dissipate the overvoltage in the signal/communication loop 2;

Like in the 2 As shown, the signal surge protector 3 comprises a discharge tube 31, a first insulation resistor 32, a second insulation resistor 33, a first voltage regulator 34 and the second voltage regulator 35, the discharge tube 31 being located at the input terminal of the signal surge protector 3 and in parallel between the positive input terminal of the signal surge protector 3, the negative input terminal and the ground line, the discharge tube 31 is a three-pole discharge tube 31, the three-pole discharge tube 31 includes an A pole, a B pole and a PE pole, the A pole connected to the positive input terminal of signal snubber 3, the B pole is connected to the negative input terminal of the signal snubber 3, the PE pole is connected to the ground line of the signal snubber 3. Discharge tube 31: the discharge tube 31 is a switching protective device. When no overvoltage occurs, the discharge tube 31 does not conduct, when an overvoltage is generated at the input terminal, the discharge tube 31 conducts and discharges the overvoltage at the input terminal to the ground line. The first insulation resistance 32 and the second insulation resistance 33 are insulation resistances and are responsible for the insulation of the input terminal and the output terminal of the signal overvoltage protector 3. When an overvoltage occurs at the input terminal, the voltage at the output terminal is clamped by the voltage regulator and the voltage difference generated by the overvoltage is supported by the insulation resistance. The task of the voltage regulator is to limit the voltage at the output terminal to the required magnitude and to divert the overcurrent generated by the overvoltage.

So, when there is an overvoltage at the input terminal, the overvoltage is discharged through the discharge tube 31, the voltage at the output terminal is clamped by the voltage regulator, the overcurrent is dissipated by the voltage regulator, so the voltage and current of the terminal of the protection measurement and - control device 4 of the box transformer is kept within the allowable range to protect the protection measurement and control device 4 from external electromagnetic interference, static electricity, lightning, operation, component failure and overvoltage damage generated or induced due to other reasons.

The first insulation resistor 32 is connected in series with the positive circuit of the signal surge protector 3, the second insulation resistor 33 is connected in series with the negative circuit of the signal surge protector 3, the first voltage regulator 34 is connected in parallel between the positive output terminal of the signal surge protector 3 and the ground line, the second voltage regulator 35 is connected in parallel between the negative output terminal of the signal snubber 3 and the ground line.

The positive input terminal of the signal surge protector 3 is connected to the positive contact that detects the signal of the primary electric circuit 1, and the negative input terminal of the signal surge protector 3 is connected to the negative contact that detects the signal of the primary electric circuit 1, with the ground line of the signal surge protector 3 is connected to the ground contact that detects the signal of the primary electrical circuit 1, the positive output terminal of the signal surge protector 3 being connected to the positive contact of the signal input of the protection measurement and control device 4, the negative output terminal of the signal surge protector 3 to the negative contact of the Signal input of the protective measuring and control device 4 is connected, the ground line of the signal overvoltage protection 3 is connected to the ground contact of the protective measuring and control device 4 .

The primary electric circuit 1 is connected to the new energy field bus line 5, the protection measurement and control device 4 is a device in which protection, measurement, control, monitoring, communication, event recording, error recording and operation error prevention functions be integrated, with the protection measurement and - control device 4 is connected to the back-end monitoring system of the box transformer, the single operating station tus signal of the box transformer and upload the signal to the box transformer 6 back-end monitoring system. Preferably, the signal/communication loop 2 also comprises a switching signal loop 21, a 4-20 mA analog signal loop 22, an RS485 communication signal loop 23 and an Ethernet communication signal loop 24.

The signal detected and uploaded by the protective measuring and control device 4 includes a switching signal of the switching signal loop 21, a 4-20 mA analog signal of the 4-20 mA analog signal loop 22, an RS485 communication signal of the RS485 communication signal loop 23, where the switching signal loop 21, the 4-20mA analog signal loop 22 and the RS485 communication signal loop 23 are respectively connected to the protection measurement and control device 4 through the signal surge protector 3, the protection measurement and control device 4 is backward connected to the signal surge protector 3 and the Ethernet communication signal is transmitted through the Ethernet communication signal loop 24, which in turn is connected to the box transformer back-end monitoring system, collects the single box transformer operating status signal, and uploads the signal to the box transformer 6 back-end monitoring system. The switching signal includes a 35kV disconnector status signal, a 35kV circuit breaker status signal, a 35kV circuit breaker fault signal, a 35kV circuit breaker remote position signal, a low-voltage side circuit breaker status signal, a low-voltage side circuit breaker fault signal , a low-side circuit breaker remote position signal, a transformer oil overtemperature alarm signal, a high transformer oil temperature trip signal, a transformer pressure relief signal, an abnormal transformer oil level signal, and a transformer box door open signal. The 4-20 mA analog signal includes transformer high-side current amplitude, transformer low-side current amplitude, and transformer oil surface temperature signal. The RS485 communication signal includes a transformer oil surface temperature sensor communication signal and a box transformer temperature and humidity controller communication signal. The Ethernet communication signal includes a communication signal between the protection measurement and control device 4 and the back-end monitoring system of the box transformer 6. In this utility model, the signal surge protector is used inside the box transformer of the new energy field, and the signal surge protector is placed in series with the signal -/Communication loop of the protection measurement and control device of the box transformer connected to realize the signal overvoltage protection function of the protection measurement and control device of the box transformer. It can be used to protect the protection measurement and control device when an overvoltage is generated or induced in the signal/communication loop of the protection measurement and control device of the box transformer to ensure the safe operation of the protection measurement and control device.

The above embodiments are not limitations of the utility model, and the utility model is not limited to the above embodiments. Changes, modifications, additions or replacements made by a person skilled in the art as part of the technical solution of the utility model also fall within the scope of protection of the utility model.

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• CN 202120898008 [0001]

Claims (10)

Box transformer with signal overvoltage protection, characterized in that it comprises a primary electrical circuit (1) and a signal/communication loop (2), the primary electrical circuit (1) being connected to the signal/communication loop (2), the signal/ Communication loop (2) comprises the signal overvoltage protection device (3) and the protection measurement and control device (4), the primary electric circuit (1) is connected to the protection measurement and control device (4) through the signal overvoltage protection device (3) in order to absorb the overvoltage in limit and derive the signal/communications loop (2); wherein the signal overvoltage protector (3) comprises a discharge tube (31), a first insulation resistor (32), a second insulation resistor (33), a first voltage regulator (34) and the second voltage regulator (35), the discharge tube (31) being located at the input terminal of the signal snubber (3) and connected between the positive input terminal of the signal snubber (3), the negative input terminal and the ground line, the first insulation resistor (32) being connected in series with the positive circuit of the signal snubber (3), the second Insulation resistance (33) is connected in series with the negative circuit of the signal snubber (3), the first voltage regulator (34) is connected in parallel between the positive output terminal of the signal snubber (3) and the ground line, the second voltage regulator (35) is connected in parallel between the negative Output terminal of the signal surge protector (3) and the ground wire is connected. Box transformer with a signal overvoltage protection after claim 1 , characterized in that the discharge tube (31) is a three-pole discharge tube (31), the three-pole discharge tube (31) comprising an A pole, a B pole and a PE pole, the A pole being connected to the positive input terminal of the signal surge protector (3), the B pole is connected to the negative input terminal of the signal surge protector (3), the PE pole is connected to the ground line of the signal surge protector (3). Box transformer with a signal overvoltage protection after claim 2 , characterized in that the positive input terminal of the signal surge protector (3) is connected to the positive contact that detects the signal of the electrical primary circuit (1) and the negative input terminal of the signal surge protector (3) is connected to the negative contact that detects the signal of the electrical primary circuit (1), the ground line of the signal overvoltage protector (3) being connected to the ground contact that acquires the signal of the electrical primary circuit (1), the positive output terminal of the signal overvoltage protector (3) being connected to the positive contact of the signal input of the protection measurement and control device (4), the negative output terminal of the signal overvoltage protection (3) is connected to the negative contact of the signal input of the protection measuring and control device (4), the ground wire of the signal overvoltage protection (3) to the ground contact of the protection measuring and - the control device (4) is connected. Box transformer with a signal overvoltage protection after claim 3 , characterized in that the electrical primary circuit (1) is connected to the new energy field bus (5), wherein the protection measurement and control device (4) is a device in which protection, measurement, control, monitoring , communication, event recording, error recording and operational error prevention functions can be integrated. Box transformer with a signal overvoltage protection after claim 4 , characterized in that the signal/communication loop (2) also comprises a switching signal loop (21), a 4-20 mA analog signal loop (22), an RS485 communication signal loop (23) and an Ethernet communication signal loop (24). Box transformer with a signal overvoltage protection after claim 5 , characterized in that the protection measurement and control device (4) detected and uploaded signal is a switching signal of the switching signal loop (21), a 4-20 mA analog signal of the 4-20 mA analog signal loop (22), an RS485 -Communication signal of the RS485 communication signal loop (23), wherein the switching signal loop (21), the 4-20mA analog signal loop (22) and the RS485 communication signal loop (23) respectively via the signal overvoltage protector (3) with the protection measuring and - control device (4), the protection measurement and control device (4) is connected backwards to the signal surge protector (3), and the Ethernet communication signal is transmitted through the Ethernet communication signal loop (24), which in turn is connected to the back-end surveillance system of the box transformer is connected, the single operating status signal of the box transformer is detected and the signal is high to the back-end monitoring system of the box transformer (6). loads. Box transformer with a signal overvoltage protection after claim 6 , thereby characterized in that the switching signal is a 35kV disconnector status signal, a 35kV circuit breaker status signal, a 35kV circuit breaker fault signal, a 35kV circuit breaker remote position signal, a low-voltage side circuit breaker status signal, a low-voltage side circuit breaker -fault signal, low voltage side circuit breaker remote position signal, transformer oil over temperature alarm signal, high transformer oil temperature trip signal, transformer depressurization signal, transformer oil level abnormal signal and transformer box door open signal. Box transformer with a signal overvoltage protection after claim 6 , characterized in that the 4-20 mA analog signal comprises transformer high-side current amplitude, transformer low-side current amplitude and a transformer oil surface temperature signal. Box transformer with a signal overvoltage protection after claim 6 , characterized in that the RS485 communication signal comprises a sensor communication signal of the surface temperature of the transformer oil and a communication signal of the temperature and humidity controller of the box transformer. Box transformer with a signal overvoltage protection after claim 6 , characterized in that the Ethernet communication signal comprises a communication signal between the protection measurement and control device (4) and the back-end monitoring system of the box transformer (6).

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