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Leon Zhang sales consultant
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Email: zxl635973785@gmail.com
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Phone/WhatsApp: +86 13655813266
ASK-43H Transformer gas and temperature protection
Transformer gas and temperature protection consists of three non-electrical protection boards, which primarily provide non-electrical output functions.
Product Functions
Light gas 71G‑L
Heavy gas 71G‑H
Oil temperature 26‑O
Winding temperature 26‑W
Pressure Protection
Pressure relief /surge 63‑P
Communication Mode
Optional: RS-485, CAN bus, Ethernet, IEC 60870-5-103 (IEC-103)
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Description
Product Overview
- Transformer gas and temperature protection consists of three non-electrical protection boards, which primarily provide non-electrical output functions.Usually installed in the same panel with transformer differential protection and transformer backup protection devices.
Product Functions (ANSI)
| No. | Protection Category | Protection Function Name | ANSI Standard Code |
|---|---|---|---|
| 1 | Buchholz / Gas Protection | Light Gas Protection | 71G‑L |
| 2 | Buchholz / Gas Protection | Heavy Gas Protection | 71G‑H |
| 3 | Temperature Protection | Oil Temperature Protection | 26‑O |
| 4 | Temperature Protection | Winding Temperature Protection | 26‑W |
| 5 | Pressure Protection | Pressure Relief / Surge Protection | 63‑P |
Communication Mode
- Optional: RS-485, CAN bus, Ethernet, IEC 60870-5-103 (IEC-103)
General Technical Data
| No. | Parameter Category | Parameter Name | Technical Specification |
|---|---|---|---|
| 1 | Control Circuit Power Supply | Rated Control Circuit Power Supply | DC 220 V / AC 220 V (to be specified when ordering) |
| 2 | Trip & Close Circuit Rating | Rated Trip & Close Operating Current | 0.5–5 A (to be specified when ordering) |
| 3 | Output Contacts Technical Specifications | DC Circuit Breaking Capacity | 50 W (applicable to DC circuit with voltage ≤ 250 V, current ≤ 0.5 A, time constant 5 ± 0.75 ms) |
| 4 | Output Contacts Technical Specifications | Continuous Current Rating (Output Contacts) | ≤ 5 A |
| 5 | Output Contacts Technical Specifications | Maximum Allowable Make Current (DC Circuit) | 5 A (applicable to DC circuit with voltage ≤ 250 V, current ≤ 0.5 A, time constant 5 ± 0.75 ms) |
| 6 | Input Contacts Technical Specifications | AC Circuit Breaking Capacity (Input Contacts) | 50 W (applicable to AC circuit with voltage ≤ 250 V) |
| 7 | Input Contacts Technical Specifications | Maximum Allowable Make Current (AC Circuit) | 5 A (applicable to AC circuit with voltage ≤ 250 V) |
Environmental Conditions
- Operating conditions: –20°C to +70°C, relative humidity 5% to 95% (no condensation or freezing inside the unit)
- Storage: –30°C to +80°C. When no excitation is applied at the extreme temperature limits, the device shall not undergo irreversible changes, and it shall function normally once the temperature returns to normal. Packaged devices shall be stored at an atmospheric pressure of 80–110 kPa (equivalent to an altitude of 2 km or less) and a relative humidity of no more than 85%.
- Transportation: -25°C to +70°C, relative humidity not exceeding 85%;
Status Indicator Descriptions
| Name | Definition | Color | Status | Remark |
|---|---|---|---|---|
| Heavy Gas 1 | Heavy Gas 1 Indicator | Red | Steady On | |
| Heavy Gas 2 | Heavy Gas 2 Indicator | Red | Steady On | |
| Pressure Relief | Pressure Relief Indicator | Red | Steady On | |
| Over-temperature Trip | Over-temperature Trip Indicator | Red | Steady On | |
| Forced Cooling Trip | Forced Cooling Trip Indicator | Red | Steady On | |
| Power | Power Indicator | Red | Steady On | |
| Light Gas 1 | Light Gas 1 Indicator | Red | Steady On | |
| Light Gas 2 | Light Gas 2 Indicator | Red | Steady On | |
| High Temperature | High Temperature Indicator | Red | Steady On | |
| Cooling Loss | Cooling Loss Indicator | Red | Steady On |
Outline and Installation Dimensions
FAQ
Q：Is non-electrical protection the primary protection or the backup protection for a transformer?
A:Generally speaking, non-current-based protection and transformer differential protection are both core forms of protection for transformers and classified as main transformer protection.
Q：What should be done after a trip triggered by transformer gas and temperature protection (non-electrical protection)?
A:First, check the alarm details of transformer gas and temperature protection trips to confirm the inspection scope. Such trips are usually caused by internal transformer faults and require strict caution.
Q：What are the main types of transformer non-electrical protection?
A: Transformer gas and temperature protection, as mainstream non-electrical protections for power transformers, consist of Buchholz protection, oil temperature protection, winding temperature protection, oil level protection and pressure relief protection. They address faults such as gas decomposition, overheating, abnormal liquid level and overpressure inside transformers.
Q: What is Transformer Gas and Temperature Protection?
A: It is a key protection combination for oil-immersed transformers, including Buchholz gas protection for internal faults and temperature protection for winding & oil overheating risks.
Q: What functions does Buchholz gas protection realize?
A: The slow gas contact sends alarm signals for minor internal faults and oil leakage; the trip contact cuts off the transformer when severe short circuit or oil surge happens inside the tank.
Q: What temperature signals does the temperature protection monitor?
A: It monitors top oil temperature of the transformer tank and winding hot spot temperature, with two-stage threshold settings for pre-alarm and circuit breaker tripping.
Q: What common faults can this protection set prevent?
A: It guards against internal winding short circuit, core overheating, insulation aging, local overheating, oil shortage and long-term overload overheating of the transformer.
Q: How are gas protection contacts connected to the protection panel?
A: The two pairs of contacts from the Buchholz relay are wired into the protection device separately for alarm loop and trip control loop with clear terminal marking.
Q: Can the temperature alarm and trip values be adjusted on site?
A: Yes. Temperature threshold and action delay can be modified on the device with password permission to match the transformer’s nameplate parameters.
Q: Why does gas protection alarm without transformer abnormal operation?
A: Main causes include air entering the oil tank during oil filling, slight oil seepage, external vibration triggering false signal, or incorrect wiring of the relay secondary circuit.
Q: What interlock logic can be configured for this protection?
A: It supports blocking trip under maintenance state, interlock with pressure relief valve signal, and joint logic with overload protection to avoid malfunction.
Q: Does the device record action events?
A: It automatically records alarm or trip time, protection element type and relevant analog values, and uploads event logs to the upper monitoring system via communication.
Q: Which communication protocols are supported?
A: Modbus-RTU, Modbus-TCP and IEC 60870-5-104 are standard; IEC 61850 communication is optional for smart substation application.
Q: What documents and warranty are provided?
A: Schematic diagrams, wiring drawings and operation manuals are delivered together. The standard warranty period is 24 months starting from factory shipment.
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Best Warranty
Professional Warranty: Reliable after-sales support for stable relay protection and long-term customer satisfaction.
xiao zhang –
This relay integrates Buchholz gas and winding/oil temperature protection, monitors transformer internal abnormal heating and internal arc faults. Simple setting, relay contact output and optional communication for distribution & power transformers.
Jack –
Complete waveform recording, very useful for fault analysis — a solid product.